aboutsummaryrefslogtreecommitdiff
path: root/src/include/taler_testing_lib.h
blob: 410a71b6aa8d32a973cc888308f7c676ff93dabc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
/*
  This file is part of TALER
  (C) 2018 Taler Systems SA

  TALER is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 3, or
  (at your option) any later version.

  TALER is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public
  License along with TALER; see the file COPYING.  If not, see
  <http://www.gnu.org/licenses/>
*/

/**
 * @file include/taler_testing_lib.h
 * @brief API for writing an interpreter to test Taler components
 * @author Christian Grothoff <christian@grothoff.org>
 * @author Marcello Stanisci
 */
#ifndef TALER_TESTING_LIB_H
#define TALER_TESTING_LIB_H

#include "taler_util.h"
#include "taler_exchange_service.h"
#include <gnunet/gnunet_json_lib.h>
#include "taler_json_lib.h"
#include "taler_bank_service.h"
#include <microhttpd.h>


/* ********************* Helper functions ********************* */

/**
 * Print failing line number and trigger shutdown.  Useful
 * quite any time after the command "run" method has been called.
 */
#define TALER_TESTING_FAIL(is) \
  do \
  { \
    GNUNET_break (0); \
    TALER_TESTING_interpreter_fail (is); \
    return; \
  } while (0)


/**
 * Allocate and return a piece of wire-details.  Combines
 * a @a payto -URL and adds some salt to create the JSON.
 *
 * @param payto payto://-URL to encapsulate
 * @return JSON describing the account, including the
 *         payto://-URL of the account, must be manually decref'd
 */
json_t *
TALER_TESTING_make_wire_details (const char *payto);


/**
 * Find denomination key matching the given amount.
 *
 * @param keys array of keys to search
 * @param amount coin value to look for
 * @return NULL if no matching key was found
 */
const struct TALER_EXCHANGE_DenomPublicKey *
TALER_TESTING_find_pk (const struct TALER_EXCHANGE_Keys *keys,
                       const struct TALER_Amount *amount);


/**
 * Configuration data for an exchange.
 */
struct TALER_TESTING_ExchangeConfiguration
{
  /**
   * Exchange base URL as it appears in the configuration.  Note
   * that it might differ from the one where the exchange actually
   * listens from.
   */
  char *exchange_url;

  /**
   * Auditor base URL as it appears in the configuration.  Note
   * that it might differ from the one where the auditor actually
   * listens from.
   */
  char *auditor_url;

};

/**
 * Connection to the database: aggregates
 * plugin and session handles.
 */
struct TALER_TESTING_DatabaseConnection
{
  /**
   * Database plugin.
   */
  struct TALER_EXCHANGEDB_Plugin *plugin;

  /**
   * Session with the database.
   */
  struct TALER_EXCHANGEDB_Session *session;
};

struct TALER_TESTING_LibeufinServices
{
  /**
   * Nexus
   */
  struct GNUNET_OS_Process *nexus;

  /**
   * Sandbox
   */
  struct GNUNET_OS_Process *sandbox;

};

/**
 * Prepare launching an exchange.  Checks that the configured
 * port is available, runs taler-exchange-keyup,
 * taler-auditor-sign and taler-exchange-dbinit.  Does not
 * launch the exchange process itself.
 *
 * @param config_filename configuration file to use
 * @param reset_db should we reset the database
 * @param[out] ec will be set to the exchange configuration data
 * @return #GNUNET_OK on success, #GNUNET_NO if test should be
 *         skipped, #GNUNET_SYSERR on test failure
 */
int
TALER_TESTING_prepare_exchange (const char *config_filename,
                                int reset_db,
                                struct TALER_TESTING_ExchangeConfiguration *ec);


/**
 * "Canonical" cert_cb used when we are connecting to the
 * Exchange.
 *
 * @param cls closure, typically, the "run" method containing
 *        all the commands to be run, and a closure for it.
 * @param hr http response details
 * @param keys the exchange's keys.
 * @param compat protocol compatibility information.
 */
void
TALER_TESTING_cert_cb (void *cls,
                       const struct TALER_EXCHANGE_HttpResponse *hr,
                       const struct TALER_EXCHANGE_Keys *keys,
                       enum TALER_EXCHANGE_VersionCompatibility compat);


/**
 * Wait for the exchange to have started. Waits for at
 * most 10s, after that returns 77 to indicate an error.
 *
 * @param base_url what URL should we expect the exchange
 *        to be running at
 * @return 0 on success
 */
int
TALER_TESTING_wait_exchange_ready (const char *base_url);


/**
 * Wait for the auditor to have started. Waits for at
 * most 10s, after that returns 77 to indicate an error.
 *
 * @param base_url what URL should we expect the auditor
 *        to be running at
 * @return 0 on success
 */
int
TALER_TESTING_wait_auditor_ready (const char *base_url);


/**
 * Remove files from previous runs
 *
 * @param config_name configuration file to use+
 */
void
TALER_TESTING_cleanup_files (const char *config_name);


/**
 * Remove files from previous runs
 *
 * @param cls NULL
 * @param cfg configuration
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_cleanup_files_cfg (void *cls,
                                 const struct GNUNET_CONFIGURATION_Handle *cfg);


/**
 * Run `taler-exchange-keyup`.
 *
 * @param config_filename configuration file to use
 * @param output_filename where to write the output for the auditor
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_run_keyup (const char *config_filename,
                         const char *output_filename);


/**
 * Run `taler-auditor-dbinit -r` (reset auditor database).
 *
 * @param config_filename configuration file to use
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_auditor_db_reset (const char *config_filename);


/**
 * Run `taler-exchange-dbinit -r` (reset exchange database).
 *
 * @param config_filename configuration file to use
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_exchange_db_reset (const char *config_filename);


/**
 * Run `taler-auditor-sign`.
 *
 * @param config_filename configuration file to use
 * @param exchange_master_pub master public key of the exchange
 * @param auditor_base_url what is the base URL of the auditor
 * @param signdata_in where is the information from taler-exchange-keyup
 * @param signdata_out where to write the output for the exchange
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_run_auditor_sign (const char *config_filename,
                                const char *exchange_master_pub,
                                const char *auditor_base_url,
                                const char *signdata_in,
                                const char *signdata_out);


/**
 * Run `taler-auditor-exchange`.
 *
 * @param config_filename configuration file to use
 * @param exchange_master_pub master public key of the exchange
 * @param exchange_base_url what is the base URL of the exchange
 * @param do_remove #GNUNET_NO to add exchange, #GNUNET_YES to remove
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_run_auditor_exchange (const char *config_filename,
                                    const char *exchange_master_pub,
                                    const char *exchange_base_url,
                                    int do_remove);


/**
 * Test port in URL string for availability.
 *
 * @param url URL to extract port from, 80 is default
 * @return #GNUNET_OK if the port is free
 */
int
TALER_TESTING_url_port_free (const char *url);


/**
 * Configuration data for a bank.
 */
struct TALER_TESTING_BankConfiguration
{

  /**
   * Authentication data for the exchange user at the bank.
   */
  struct TALER_BANK_AuthenticationData exchange_auth;

  /**
   * Payto URL of the exchange's account ("2")
   */
  char *exchange_payto;

  /**
   * Payto URL of a user account ("42")
   */
  char *user42_payto;

  /**
   * Payto URL of another user's account ("43")
   */
  char *user43_payto;

};

/**
 * Prepare launching a fakebank.  Check that the configuration
 * file has the right option, and that the port is available.
 * If everything is OK, return the configuration data of the fakebank.
 *
 * @param config_filename configuration file to use
 * @param config_section which account to use
 *                       (must match x-taler-bank)
 * @param[out] bc set to the bank's configuration data
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_prepare_fakebank (const char *config_filename,
                                const char *config_section,
                                struct TALER_TESTING_BankConfiguration *bc);


/* ******************* Generic interpreter logic ************ */

/**
 * Global state of the interpreter, used by a command
 * to access information about other commands.
 */
struct TALER_TESTING_Interpreter
{

  /**
   * Commands the interpreter will run.
   */
  struct TALER_TESTING_Command *commands;

  /**
   * Interpreter task (if one is scheduled).
   */
  struct GNUNET_SCHEDULER_Task *task;

  /**
   * ID of task called whenever we get a SIGCHILD.
   * Used for #TALER_TESTING_wait_for_sigchld().
   */
  struct GNUNET_SCHEDULER_Task *child_death_task;

  /**
   * Main execution context for the main loop.
   */
  struct GNUNET_CURL_Context *ctx;

  /**
   * Our configuration.
   */
  const struct GNUNET_CONFIGURATION_Handle *cfg;

  /**
   * Context for running the CURL event loop.
   */
  struct GNUNET_CURL_RescheduleContext *rc;

  /**
   * Handle to our fakebank, if #TALER_TESTING_run_with_fakebank()
   * was used.  Otherwise NULL.
   */
  struct TALER_FAKEBANK_Handle *fakebank;

  /**
   * Task run on timeout.
   */
  struct GNUNET_SCHEDULER_Task *timeout_task;

  /**
   * Function to call for cleanup at the end. Can be NULL.
   */
  GNUNET_SCHEDULER_TaskCallback final_cleanup_cb;

  /**
   * Closure for #final_cleanup_cb().
   */
  void *final_cleanup_cb_cls;

  /**
   * Instruction pointer.  Tells #interpreter_run() which instruction to run
   * next.  Need (signed) int because it gets -1 when rewinding the
   * interpreter to the first CMD.
   */
  int ip;

  /**
   * Result of the testcases, #GNUNET_OK on success
   */
  int result;

  /**
   * Handle to the exchange.
   */
  struct TALER_EXCHANGE_Handle *exchange;

  /**
   * Handle to the auditor.  NULL unless specifically initialized
   * as part of #TALER_TESTING_auditor_setup().
   */
  struct TALER_AUDITOR_Handle *auditor;

  /**
   * Handle to exchange process; some commands need it
   * to send signals.  E.g. to trigger the key state reload.
   */
  struct GNUNET_OS_Process *exchanged;

  /**
   * Public key of the auditor.
   */
  struct TALER_AuditorPublicKeyP auditor_pub;

  /**
   * Private key of the auditor.
   */
  struct TALER_AuditorPrivateKeyP auditor_priv;

  /**
   * Private offline signing key.
   */
  struct TALER_MasterPrivateKeyP master_priv;

  /**
   * Public offline signing key.
   */
  struct TALER_MasterPublicKeyP master_pub;

  /**
   * URL of the auditor (as per configuration).
   */
  char *auditor_url;

  /**
   * URL of the exchange (as per configuration).
   */
  char *exchange_url;

  /**
   * #GNUNET_OK if key state should be reloaded.  NOTE: this
   * field can be removed because a new "send signal" command
   * has been introduced.
   */
  int reload_keys;

  /**
   * Is the interpreter running (#GNUNET_YES) or waiting
   * for /keys (#GNUNET_NO)?
   */
  int working;

  /**
   * Is the auditor running (#GNUNET_YES) or waiting
   * for /version (#GNUNET_NO)?
   */
  int auditor_working;

  /**
   * How often have we gotten a /keys response so far?
   */
  unsigned int key_generation;

  /**
   * Exchange keys from last download.
   */
  const struct TALER_EXCHANGE_Keys *keys;

};


/**
 * A command to be run by the interpreter.
 */
struct TALER_TESTING_Command
{

  /**
   * Closure for all commands with command-specific context
   * information.
   */
  void *cls;

  /**
   * Label for the command.
   */
  const char *label;

  /**
   * Runs the command.  Note that upon return, the interpreter
   * will not automatically run the next command, as the command
   * may continue asynchronously in other scheduler tasks.  Thus,
   * the command must ensure to eventually call
   * #TALER_TESTING_interpreter_next() or
   * #TALER_TESTING_interpreter_fail().
   *
   * @param cls closure
   * @param cmd command being run
   * @param i interpreter state
   */
  void
  (*run)(void *cls,
         const struct TALER_TESTING_Command *cmd,
         struct TALER_TESTING_Interpreter *i);


  /**
   * Clean up after the command.  Run during forced termination
   * (CTRL-C) or test failure or test success.
   *
   * @param cls closure
   * @param cmd command being cleaned up
   */
  void
  (*cleanup)(void *cls,
             const struct TALER_TESTING_Command *cmd);

  /**
   * Extract information from a command that is useful for other
   * commands.
   *
   * @param cls closure
   * @param[out] ret result (could be anything)
   * @param trait name of the trait
   * @param index index number of the object to extract.
   * @return #GNUNET_OK on success
   */
  int
  (*traits)(void *cls,
            const void **ret,
            const char *trait,
            unsigned int index);

  /**
   * When did the execution of this command start?
   */
  struct GNUNET_TIME_Absolute start_time;

  /**
   * When did the execution of this command finish?
   */
  struct GNUNET_TIME_Absolute finish_time;

  /**
   * When did we start the last request of this command?
   * Delta to @e finish_time gives the latency for the last
   * successful request.
   */
  struct GNUNET_TIME_Absolute last_req_time;

  /**
   * How often did we try to execute this command? (In case
   * it is a request that is repated.)
   */
  unsigned int num_tries;

};


/**
 * Lookup command by label.
 *
 * @param is interpreter state.
 * @param label label of the command to lookup.
 * @return the command, if it is found, or NULL.
 */
const struct TALER_TESTING_Command *
TALER_TESTING_interpreter_lookup_command (struct TALER_TESTING_Interpreter *is,
                                          const char *label);

/**
 * Obtain main execution context for the main loop.
 *
 * @param is interpreter state.
 * @return CURL execution context.
 */
struct GNUNET_CURL_Context *
TALER_TESTING_interpreter_get_context (struct TALER_TESTING_Interpreter *is);

/**
 * Obtain label of the command being now run.
 *
 * @param is interpreter state.
 * @return the label.
 */
const char *
TALER_TESTING_interpreter_get_current_label (
  struct TALER_TESTING_Interpreter *is);


/**
 * Get connection handle to the fakebank.
 *
 * @param is interpreter state.
 * @return the handle.
 */
struct TALER_FAKEBANK_Handle *
TALER_TESTING_interpreter_get_fakebank (struct TALER_TESTING_Interpreter *is);

/**
 * Current command is done, run the next one.
 *
 * @param is interpreter state.
 */
void
TALER_TESTING_interpreter_next (struct TALER_TESTING_Interpreter *is);

/**
 * Current command failed, clean up and fail the test case.
 *
 * @param is interpreter state.
 */
void
TALER_TESTING_interpreter_fail (struct TALER_TESTING_Interpreter *is);

/**
 * Create command array terminator.
 *
 * @return a end-command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_end (void);


/**
 * Make the instruction pointer point to @a target_label
 * only if @a counter is greater than zero.
 *
 * @param label command label
 * @param target_label label of the new instruction pointer's destination after the jump;
 *                     must be before the current instruction
 * @param counter counts how many times the rewinding is to happen.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_rewind_ip (const char *label,
                             const char *target_label,
                             unsigned int counter);


/**
 * Wait until we receive SIGCHLD signal.
 * Then obtain the process trait of the current
 * command, wait on the the zombie and continue
 * with the next command.
 *
 * @param is interpreter state.
 */
void
TALER_TESTING_wait_for_sigchld (struct TALER_TESTING_Interpreter *is);


/**
 * Schedule the first CMD in the CMDs array.
 *
 * @param is interpreter state.
 * @param commands array of all the commands to execute.
 */
void
TALER_TESTING_run (struct TALER_TESTING_Interpreter *is,
                   struct TALER_TESTING_Command *commands);


/**
 * Run the testsuite.  Note, CMDs are copied into
 * the interpreter state because they are _usually_
 * defined into the "run" method that returns after
 * having scheduled the test interpreter.
 *
 * @param is the interpreter state
 * @param commands the list of command to execute
 * @param timeout how long to wait
 */
void
TALER_TESTING_run2 (struct TALER_TESTING_Interpreter *is,
                    struct TALER_TESTING_Command *commands,
                    struct GNUNET_TIME_Relative timeout);


/**
 * First launch the fakebank, then schedule the first CMD
 * in the array of all the CMDs to execute.
 *
 * @param is interpreter state.
 * @param commands array of all the commands to execute.
 * @param bank_url base URL of the fake bank.
 */
void
TALER_TESTING_run_with_fakebank (struct TALER_TESTING_Interpreter *is,
                                 struct TALER_TESTING_Command *commands,
                                 const char *bank_url);


/**
 * The function that contains the array of all the CMDs to run,
 * which is then on charge to call some fashion of
 * TALER_TESTING_run*.  In all the test cases, this function is
 * always the GNUnet-ish "run" method.
 *
 * @param cls closure.
 * @param is interpreter state.
 */
typedef void
(*TALER_TESTING_Main)(void *cls,
                      struct TALER_TESTING_Interpreter *is);


/**
 * Install signal handlers plus schedules the main wrapper
 * around the "run" method.
 *
 * @param main_cb the "run" method which coontains all the
 *        commands.
 * @param main_cb_cls a closure for "run", typically NULL.
 * @param cfg configuration to use
 * @param exchanged exchange process handle: will be put in the
 *        state as some commands - e.g. revoke - need to send
 *        signal to it, for example to let it know to reload the
 *        key state.. if NULL, the interpreter will run without
 *        trying to connect to the exchange first.
 * @param exchange_connect GNUNET_YES if the test should connect
 *        to the exchange, GNUNET_NO otherwise
 * @return #GNUNET_OK if all is okay, != #GNUNET_OK otherwise.
 *         non-GNUNET_OK codes are #GNUNET_SYSERR most of the
 *         times.
 */
int
TALER_TESTING_setup (TALER_TESTING_Main main_cb,
                     void *main_cb_cls,
                     const struct GNUNET_CONFIGURATION_Handle *cfg,
                     struct GNUNET_OS_Process *exchanged,
                     int exchange_connect);


/**
 * Install signal handlers plus schedules the main wrapper
 * around the "run" method.
 *
 * @param main_cb the "run" method which contains all the
 *        commands.
 * @param main_cb_cls a closure for "run", typically NULL.
 * @param config_filename configuration filename.
 * @return #GNUNET_OK if all is okay, != #GNUNET_OK otherwise.
 *         non-GNUNET_OK codes are #GNUNET_SYSERR most of the
 *         times.
 */
int
TALER_TESTING_auditor_setup (TALER_TESTING_Main main_cb,
                             void *main_cb_cls,
                             const char *config_filename);


/**
 * Closure for #TALER_TESTING_setup_with_exchange_cfg().
 */
struct TALER_TESTING_SetupContext
{
  /**
   * Main function of the test to run.
   */
  TALER_TESTING_Main main_cb;

  /**
   * Closure for @e main_cb.
   */
  void *main_cb_cls;

  /**
   * Name of the configuration file.
   */
  const char *config_filename;
};


/**
 * Initialize scheduler loop and curl context for the test case
 * including starting and stopping the exchange using the given
 * configuration file.
 *
 * @param cls must be a `struct TALER_TESTING_SetupContext *`
 * @param cfg configuration to use.
 * @return #GNUNET_OK if no errors occurred.
 */
int
TALER_TESTING_setup_with_exchange_cfg (
  void *cls,
  const struct GNUNET_CONFIGURATION_Handle *cfg);


/**
 * Initialize scheduler loop and curl context for the test case
 * including starting and stopping the exchange using the given
 * configuration file.
 *
 * @param main_cb main method.
 * @param main_cb_cls main method closure.
 * @param config_file configuration file name.  Is is used
 *        by both this function and the exchange itself.  In the
 *        first case it gives out the exchange port number and
 *        the exchange base URL so as to check whether the port
 *        is available and the exchange responds when requested
 *        at its base URL.
 * @return #GNUNET_OK if no errors occurred.
 */
int
TALER_TESTING_setup_with_exchange (TALER_TESTING_Main main_cb,
                                   void *main_cb_cls,
                                   const char *config_file);


/**
 * Initialize scheduler loop and curl context for the test case
 * including starting and stopping the auditor and exchange using
 * the given configuration file.
 *
 * @param cls must be a `struct TALER_TESTING_SetupContext *`
 * @param cfg configuration to use.
 * @return #GNUNET_OK if no errors occurred.
 */
int
TALER_TESTING_setup_with_auditor_and_exchange_cfg (
  void *cls,
  const struct GNUNET_CONFIGURATION_Handle *cfg);


/**
 * Initialize scheduler loop and curl context for the test case
 * including starting and stopping the auditor and exchange using
 * the given configuration file.
 *
 * @param main_cb main method.
 * @param main_cb_cls main method closure.
 * @param config_file configuration file name.  Is is used
 *        by both this function and the exchange itself.  In the
 *        first case it gives out the exchange port number and
 *        the exchange base URL so as to check whether the port
 *        is available and the exchange responds when requested
 *        at its base URL.
 * @return #GNUNET_OK if no errors occurred.
 */
int
TALER_TESTING_setup_with_auditor_and_exchange (TALER_TESTING_Main main_cb,
                                               void *main_cb_cls,
                                               const char *config_file);


/**
 * Start the (Python) bank process.  Assume the port
 * is available and the database is clean.  Use the "prepare
 * bank" function to do such tasks.
 *
 * @param config_filename configuration filename.
 * @param bank_url base URL of the bank, used by `wget' to check
 *        that the bank was started right.
 * @return the process, or NULL if the process could not
 *         be started.
 */
struct GNUNET_OS_Process *
TALER_TESTING_run_bank (const char *config_filename,
                        const char *bank_url);

/**
 * Start the (nexus) bank process.  Assume the port
 * is available and the database is clean.  Use the "prepare
 * bank" function to do such tasks.  This function is also
 * responsible to create the exchange EBICS subscriber at
 * the nexus.
 *
 * @param bc bank configuration of the bank
 * @return the process, or NULL if the process could not
 *         be started.
 */
struct TALER_TESTING_LibeufinServices
TALER_TESTING_run_libeufin (const struct TALER_TESTING_BankConfiguration *bc);


/**
 * Runs the Fakebank by guessing / extracting the portnumber
 * from the base URL.
 *
 * @param bank_url bank's base URL.
 * @param currency currency the bank uses
 * @return the fakebank process handle, or NULL if any
 *         error occurs.
 */
struct TALER_FAKEBANK_Handle *
TALER_TESTING_run_fakebank (const char *bank_url,
                            const char *currency);


/**
 * Prepare the bank execution.  Check if the port is available
 * and reset database.
 *
 * @param config_filename configuration file name.
 * @param reset_db should we reset the bank's database
 * @param[out] bc set to the bank's configuration data
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_prepare_bank (const char *config_filename,
                            int reset_db,
                            const char *config_section,
                            struct TALER_TESTING_BankConfiguration *bc);

/**
 * Prepare the Nexus execution.  Check if the port is available
 * and delete old database.
 *
 * @param config_filename configuration file name.
 * @param reset_db should we reset the bank's database
 * @param config_section section of the configuration with the exchange's account
 * @param[out] bc set to the bank's configuration data
 * @return the base url, or NULL upon errors.  Must be freed
 *         by the caller.
 */
int
TALER_TESTING_prepare_nexus (const char *config_filename,
                             int reset_db,
                             const char *config_section,
                             struct TALER_TESTING_BankConfiguration *bc);

/**
 * Look for substring in a programs' name.
 *
 * @param prog program's name to look into
 * @param marker chunk to find in @a prog
 */
int
TALER_TESTING_has_in_name (const char *prog,
                           const char *marker);


/* ************** Specific interpreter commands ************ */


/**
 * Make a credit "history" CMD.
 *
 * @param label command label.
 * @param auth login data to use
 * @param start_row_reference reference to a command that can
 *        offer a row identifier, to be used as the starting row
 *        to accept in the result.
 * @param num_results how many rows we want in the result,
 *        and ascending/descending call
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_bank_credits (
  const char *label,
  const struct TALER_BANK_AuthenticationData *auth,
  const char *start_row_reference,
  long long num_results);


/**
 * Make a debit "history" CMD.
 *
 * @param label command label.
 * @param auth authentication data
 * @param start_row_reference reference to a command that can
 *        offer a row identifier, to be used as the starting row
 *        to accept in the result.
 * @param num_results how many rows we want in the result.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_bank_debits (const char *label,
                               const struct TALER_BANK_AuthenticationData *auth,
                               const char *start_row_reference,
                               long long num_results);


/**
 * Create transfer command.
 *
 * @param label command label.
 * @param amount amount to transfer.
 * @param auth authentication data to use
 * @param payto_credit_account which account receives money.
 * @param wtid wire transfer identifier to use
 * @param exchange_base_url exchange URL to use
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_transfer (const char *label,
                            const char *amount,
                            const struct TALER_BANK_AuthenticationData *auth,
                            const char *payto_debit_account,
                            const char *payto_credit_account,
                            const struct TALER_WireTransferIdentifierRawP *wtid,
                            const char *exchange_base_url);


/**
 * Modify a transfer command to enable retries when the reserve is not yet
 * full or we get other transient errors from the bank.
 *
 * @param cmd a fakebank transfer command
 * @return the command with retries enabled
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_transfer_retry (struct TALER_TESTING_Command cmd);


/**
 * Make the "exec-auditor" CMD.
 *
 * @param label command label.
 * @param config_filename configuration filename.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exec_auditor (const char *label,
                                const char *config_filename);


/**
 * Make the "exec-auditor-dbinit" CMD. Always run with the "-r" option.
 *
 * @param label command label.
 * @param config_filename configuration filename.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exec_auditor_dbinit (const char *label,
                                       const char *config_filename);


/**
 * Create a "deposit-confirmation" command.
 *
 * @param label command label.
 * @param auditor auditor connection.
 * @param deposit_reference reference to any operation that can
 *        provide a coin.
 * @param coin_index if @a deposit_reference offers an array of
 *        coins, this parameter selects which one in that array.
 *        This value is currently ignored, as only one-coin
 *        deposits are implemented.
 * @param amount_without_fee deposited amount without the fee
 * @param expected_response_code expected HTTP response code.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_deposit_confirmation (const char *label,
                                        struct TALER_AUDITOR_Handle *auditor,
                                        const char *deposit_reference,
                                        unsigned int coin_index,
                                        const char *amount_without_fee,
                                        unsigned int expected_response_code);


/**
 * Modify a deposit confirmation command to enable retries when we get
 * transient errors from the auditor.
 *
 * @param cmd a deposit confirmation command
 * @return the command with retries enabled
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_deposit_confirmation_with_retry (
  struct TALER_TESTING_Command
  cmd);


/**
 * Create a "list exchanges" command.
 *
 * @param label command label.
 * @param auditor auditor connection.
 * @param expected_response_code expected HTTP response code.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exchanges (const char *label,
                             struct TALER_AUDITOR_Handle *auditor,
                             unsigned int expected_response_code);


/**
 * Create a "list exchanges" command and check whether
 * a particular exchange belongs to the returned bundle.
 *
 * @param label command label.
 * @param expected_response_code expected HTTP response code.
 * @param exchange_url URL of the exchange supposed to
 *  be included in the response.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exchanges_with_url (const char *label,
                                      unsigned int expected_response_code,
                                      const char *exchange_url);

/**
 * Modify an exchanges command to enable retries when we get
 * transient errors from the auditor.
 *
 * @param cmd a deposit confirmation command
 * @return the command with retries enabled
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exchanges_with_retry (struct TALER_TESTING_Command cmd);


/**
 * Create /admin/add-incoming command.
 *
 * @param label command label.
 * @param amount amount to transfer.
 * @param payto_debit_account which account sends money.
 * @param auth authentication data
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_admin_add_incoming (
  const char *label,
  const char *amount,
  const struct TALER_BANK_AuthenticationData *auth,
  const char *payto_debit_account);


/**
 * Create "fakebank transfer" CMD, letting the caller specify
 * a reference to a command that can offer a reserve private key.
 * This private key will then be used to construct the subject line
 * of the wire transfer.
 *
 * @param label command label.
 * @param amount the amount to transfer.
 * @param payto_debit_account which account sends money.
 * @param auth authentication data
 * @param ref reference to a command that can offer a reserve
 *        private key or public key.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_admin_add_incoming_with_ref (
  const char *label,
  const char *amount,
  const struct TALER_BANK_AuthenticationData *auth,
  const char *payto_debit_account,
  const char *ref);


/**
 * Modify a fakebank transfer command to enable retries when the
 * reserve is not yet full or we get other transient errors from
 * the fakebank.
 *
 * @param cmd a fakebank transfer command
 * @return the command with retries enabled
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_admin_add_incoming_retry (struct TALER_TESTING_Command cmd);


/**
 * Make a "wirewatch" CMD.
 *
 * @param label command label.
 * @param config_filename configuration filename.
 *
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exec_wirewatch (const char *label,
                                  const char *config_filename);

/**
 * Make a "aggregator" CMD.
 *
 * @param label command label.
 * @param config_filename configuration file for the
 *                        aggregator to use.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exec_aggregator (const char *label,
                                   const char *config_filename);


/**
 * Make a "closer" CMD.  Note that it is right now not supported to run the
 * closer to close multiple reserves in combination with a subsequent reserve
 * status call, as we cannot generate the traits necessary for multiple closed
 * reserves.  You can work around this by using multiple closer commands, one
 * per reserve that is being closed.
 *
 * @param label command label.
 * @param config_filename configuration file for the
 *                        closer to use.
 * @param expected_amount amount we expect to see wired from a @a expected_reserve_ref
 * @param expected_fee closing fee we expect to see
 * @param expected_reserve_ref reference to a reserve we expect the closer to drain;
 *          NULL if we do not expect the closer to do anything
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exec_closer (const char *label,
                               const char *config_filename,
                               const char *expected_amount,
                               const char *expected_fee,
                               const char *expected_reserve_ref);


/**
 * Make a "transfer" CMD.
 *
 * @param label command label.
 * @param config_filename configuration file for the
 *                        transfer to use.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exec_transfer (const char *label,
                                 const char *config_filename);


/**
 * Make the "keyup" CMD.
 *
 * @param label command label.
 * @param config_filename configuration filename.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exec_keyup (const char *label,
                              const char *config_filename);


/**
 * Make the "keyup" CMD, with "--timestamp" option.
 *
 * @param label command label.
 * @param config_filename configuration filename.
 * @param now Unix timestamp representing the fake "now".
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exec_keyup_with_now (const char *label,
                                       const char *config_filename,
                                       struct GNUNET_TIME_Absolute now);


/**
 * Make a "check keys" command.  This type of command
 * checks whether the number of denomination keys from
 * @a exchange matches @a num_denom_keys.
 *
 * @param label command label
 * @param generation when this command is run, exactly @a
 *        generation /keys downloads took place.  If the number
 *        of downloads is less than @a generation, the logic will
 *        first make sure that @a generation downloads are done,
 *        and _then_ execute the rest of the command.
 * @param num_denom_keys expected number of denomination keys.
 * @param now timestamp to use when fetching keys
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_check_keys_with_now (const char *label,
                                       unsigned int generation,
                                       unsigned int num_denom_keys,
                                       struct GNUNET_TIME_Absolute now);


/**
 * Make a "auditor sign" CMD.
 *
 * @param label command label
 * @param config_filename configuration filename
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_exec_auditor_sign (const char *label,
                                     const char *config_filename);


/**
 * Create a withdraw command, letting the caller specify
 * the desired amount as string.
 *
 * @param label command label.
 * @param reserve_reference command providing us with a reserve to withdraw from
 * @param amount how much we withdraw.
 * @param expected_response_code which HTTP response code
 *        we expect from the exchange.
 * @return the withdraw command to be executed by the interpreter.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_withdraw_amount (const char *label,
                                   const char *reserve_reference,
                                   const char *amount,
                                   unsigned int expected_response_code);


/**
 * Create a withdraw command, letting the caller specify
 * the desired amount as string and also re-using an existing
 * coin private key in the process (violating the specification,
 * which will result in an error when spending the coin!).
 *
 * @param label command label.
 * @param reserve_reference command providing us with a reserve to withdraw from
 * @param amount how much we withdraw.
 * @param coin_ref reference to (withdraw/reveal) command of a coin
 *        from which we should re-use the private key
 * @param expected_response_code which HTTP response code
 *        we expect from the exchange.
 * @return the withdraw command to be executed by the interpreter.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_withdraw_amount_reuse_key (
  const char *label,
  const char *reserve_reference,
  const char *amount,
  const char *coin_ref,
  unsigned int expected_response_code);


/**
 * Create withdraw command, letting the caller specify the
 * amount by a denomination key.
 *
 * @param label command label.
 * @param reserve_reference reference to the reserve to withdraw
 *        from; will provide reserve priv to sign the request.
 * @param dk denomination public key.
 * @param expected_response_code expected HTTP response code.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_withdraw_denomination (
  const char *label,
  const char *reserve_reference,
  const struct TALER_EXCHANGE_DenomPublicKey *dk,
  unsigned int expected_response_code);


/**
 * Modify a withdraw command to enable retries when the
 * reserve is not yet full or we get other transient
 * errors from the exchange.
 *
 * @param cmd a withdraw command
 * @return the command with retries enabled
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_withdraw_with_retry (struct TALER_TESTING_Command cmd);


/**
 * Create a "wire" command.
 *
 * @param label the command label.
 * @param expected_method which wire-transfer method is expected
 *        to be offered by the exchange.
 * @param expected_fee the fee the exchange should charge.
 * @param expected_response_code the HTTP response the exchange
 *        should return.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_wire (const char *label,
                        const char *expected_method,
                        const char *expected_fee,
                        unsigned int expected_response_code);


/**
 * Create a GET "reserves" command.
 *
 * @param label the command label.
 * @param reserve_reference reference to the reserve to check.
 * @param expected_balance expected balance for the reserve.
 * @param expected_response_code expected HTTP response code.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_status (const char *label,
                          const char *reserve_reference,
                          const char *expected_balance,
                          unsigned int expected_response_code);

/**
 * Index of the deposit value trait of a deposit command.
 */
#define TALER_TESTING_CMD_DEPOSIT_TRAIT_IDX_DEPOSIT_VALUE 0

/**
 * Index of the deposit fee trait of a deposit command.
 */
#define TALER_TESTING_CMD_DEPOSIT_TRAIT_IDX_DEPOSIT_FEE 1

/**
 * Create a "deposit" command.
 *
 * @param label command label.
 * @param coin_reference reference to any operation that can
 *        provide a coin.
 * @param coin_index if @a withdraw_reference offers an array of
 *        coins, this parameter selects which one in that array.
 *        This value is currently ignored, as only one-coin
 *        withdrawals are implemented.
 * @param target_account_payto target account for the "deposit"
 *        request.
 * @param contract_terms contract terms to be signed over by the
 *        coin.
 * @param refund_deadline refund deadline, zero means 'no refunds'.
 * @param amount how much is going to be deposited.
 * @param expected_response_code expected HTTP response code.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_deposit (const char *label,
                           const char *coin_reference,
                           unsigned int coin_index,
                           const char *target_account_payto,
                           const char *contract_terms,
                           struct GNUNET_TIME_Relative refund_deadline,
                           const char *amount,
                           unsigned int expected_response_code);

/**
 * Create a "deposit" command that references an existing merchant key.
 *
 * @param label command label.
 * @param coin_reference reference to any operation that can
 *        provide a coin.
 * @param coin_index if @a withdraw_reference offers an array of
 *        coins, this parameter selects which one in that array.
 *        This value is currently ignored, as only one-coin
 *        withdrawals are implemented.
 * @param target_account_payto target account for the "deposit"
 *        request.
 * @param contract_terms contract terms to be signed over by the
 *        coin.
 * @param refund_deadline refund deadline, zero means 'no refunds'.
 *        Note, if time were absolute, then it would have come
 *        one day and disrupt tests meaning.
 * @param amount how much is going to be deposited.
 * @param expected_response_code expected HTTP response code.
 * @param merchant_priv_reference reference to another operation
 *        that has a merchant private key trait
 *
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_deposit_with_ref (const char *label,
                                    const char *coin_reference,
                                    unsigned int coin_index,
                                    const char *target_account_payto,
                                    const char *contract_terms,
                                    struct GNUNET_TIME_Relative refund_deadline,
                                    const char *amount,
                                    unsigned int expected_response_code,
                                    const char *merchant_priv_reference);

/**
 * Modify a deposit command to enable retries when we get transient
 * errors from the exchange.
 *
 * @param cmd a deposit command
 * @return the command with retries enabled
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_deposit_with_retry (struct TALER_TESTING_Command cmd);


/**
 * Create a "deposit" command that repeats an existing
 * deposit command.
 *
 * @param label command label.
 * @param deposit_reference which deposit command should we repeat
 * @param expected_response_code expected HTTP response code.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_deposit_replay (const char *label,
                                  const char *deposit_reference,
                                  unsigned int expected_response_code);


/**
 * Create a "refresh melt" command.
 *
 * @param label command label.
 * @param coin_reference reference to a command
 *        that will provide a coin to refresh.
 * @param expected_response_code expected HTTP code.
 * @param ... NULL-terminated list of amounts to be melted
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_melt (const char *label,
                        const char *coin_reference,
                        unsigned int expected_response_code,
                        ...);


/**
 * Create a "refresh melt" CMD that does TWO /refresh/melt
 * requests.  This was needed to test the replay of a valid melt
 * request, see #5312.
 *
 * @param label command label
 * @param coin_reference reference to a command that will provide
 *        a coin to refresh
 * @param expected_response_code expected HTTP code
 * @param ... NULL-terminated list of amounts to be melted
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_melt_double (const char *label,
                               const char *coin_reference,
                               unsigned int expected_response_code,
                               ...);


/**
 * Modify a "refresh melt" command to enable retries.
 *
 * @param cmd command
 * @return modified command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_melt_with_retry (struct TALER_TESTING_Command cmd);


/**
 * Create a "refresh reveal" command.
 *
 * @param label command label.
 * @param melt_reference reference to a "refresh melt" command.
 * @param expected_response_code expected HTTP response code.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_refresh_reveal (const char *label,
                                  const char *melt_reference,
                                  unsigned int expected_response_code);


/**
 * Modify a "refresh reveal" command to enable retries.
 *
 * @param cmd command
 * @return modified command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_refresh_reveal_with_retry (struct TALER_TESTING_Command cmd);


/**
 * Create a "refresh link" command.
 *
 * @param label command label.
 * @param reveal_reference reference to a "refresh reveal" CMD.
 * @param expected_response_code expected HTTP response code
 * @return the "refresh link" command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_refresh_link (const char *label,
                                const char *reveal_reference,
                                unsigned int expected_response_code);


/**
 * Modify a "refresh link" command to enable retries.
 *
 * @param cmd command
 * @return modified command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_refresh_link_with_retry (struct TALER_TESTING_Command cmd);


/**
 * Create a "track transaction" command.
 *
 * @param label the command label.
 * @param transaction_reference reference to a deposit operation,
 *        will be used to get the input data for the track.
 * @param coin_index index of the coin involved in the transaction.
 * @param expected_response_code expected HTTP response code.
 * @param bank_transfer_reference reference to a command that
 *        can offer a WTID so as to check that against what WTID
 *        the tracked operation has.  Set as NULL if not needed.
 *
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_track_transaction (const char *label,
                                     const char *transaction_reference,
                                     unsigned int coin_index,
                                     unsigned int expected_response_code,
                                     const char *bank_transfer_reference);

/**
 * Make a "track transfer" CMD where no "expected"-arguments,
 * except the HTTP response code, are given.  The best use case
 * is when what matters to check is the HTTP response code, e.g.
 * when a bogus WTID was passed.
 *
 * @param label the command label
 * @param wtid_reference reference to any command which can provide
 *        a wtid.  If NULL is given, then a all zeroed WTID is
 *        used that will at 99.9999% probability NOT match any
 *        existing WTID known to the exchange.
 * @param index index number of the WTID to track, in case there
 *        are multiple on offer.
 * @param expected_response_code expected HTTP response code.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_track_transfer_empty (const char *label,
                                        const char *wtid_reference,
                                        unsigned int index,
                                        unsigned int expected_response_code);


/**
 * Make a "track transfer" command, specifying which amount and
 * wire fee are expected.
 *
 * @param label the command label.
 * @param wtid_reference reference to any command which can provide
 *        a wtid.  Will be the one tracked.
 * @param index in case there are multiple WTID offered, this
 *        parameter selects a particular one.
 * @param expected_response_code expected HTTP response code.
 * @param expected_total_amount how much money we expect being moved
 *        with this wire-transfer.
 * @param expected_wire_fee expected wire fee.
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_track_transfer (const char *label,
                                  const char *wtid_reference,
                                  unsigned int index,
                                  unsigned int expected_response_code,
                                  const char *expected_total_amount,
                                  const char *expected_wire_fee);

/**
 * Make a "bank check" CMD.  It checks whether a particular wire transfer from
 * the exchange (debit) has been made or not.
 *
 * @param label the command label.
 * @param exchange_base_url base url of the exchange involved in
 *        the wire transfer.
 * @param amount the amount expected to be transferred.
 * @param debit_payto the account that gave money.
 * @param credit_payto the account that received money.
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_check_bank_transfer (const char *label,
                                       const char *exchange_base_url,
                                       const char *amount,
                                       const char *debit_payto,
                                       const char *credit_payto);


/**
 * Make a "bank check" CMD.  It checks whether a particular wire transfer to
 * the exchange (credit) has been made or not.
 *
 * @param label the command label.
 * @param amount the amount expected to be transferred.
 * @param debit_payto the account that gave money.
 * @param credit_payto the account that received money.
 * @param reserve_pub_ref command that provides the reserve public key to expect
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_check_bank_admin_transfer (const char *label,
                                             const char *amount,
                                             const char *debit_payto,
                                             const char *credit_payto,
                                             const char *reserve_pub_ref);


/**
 * Define a "bank check" CMD that takes the input
 * data from another CMD that offers it.
 *
 * @param label command label.
 * @param deposit_reference reference to a CMD that is
 *        able to provide the "check bank transfer" operation
 *        input data.
 *
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_check_bank_transfer_with_ref (const char *label,
                                                const char *deposit_reference);


/**
 * Checks whether all the wire transfers got "checked"
 * by the "bank check" CMD.
 *
 * @param label command label.
 *
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_check_bank_empty (const char *label);


/**
 * Create a "refund" command, allow to specify refund transaction
 * id.  Mainly used to create conflicting requests.
 *
 * @param label command label.
 * @param expected_response_code expected HTTP status code.
 * @param refund_amount the amount to ask a refund for.
 * @param coin_reference reference to a command that can
 *        provide a coin to be refunded.
 * @param refund_transaction_id transaction id to use
 *        in the request.
 *
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_refund_with_id (const char *label,
                                  unsigned int expected_response_code,
                                  const char *refund_amount,
                                  const char *deposit_reference,
                                  uint64_t refund_transaction_id);


/**
 * Create a "refund" command.
 *
 * @param label command label.
 * @param expected_response_code expected HTTP status code.
 * @param refund_amount the amount to ask a refund for.
 * @param coin_reference reference to a command that can
 *        provide a coin to be refunded.
 *
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_refund (const char *label,
                          unsigned int expected_response_code,
                          const char *refund_amount,
                          const char *deposit_reference);


/**
 * Make a "recoup" command.
 *
 * @param label the command label
 * @param expected_response_code expected HTTP status code
 * @param coin_reference reference to any command which
 *        offers a coin and reserve private key.  May specify
 *        the index of the coin using "$LABEL#$INDEX" syntax.
 *        Here, $INDEX must be a non-negative number.
 * @param melt_reference NULL if coin was not refreshed, otherwise label of the melt operation
 * @param amount how much do we expect to recoup, NULL for nothing
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_recoup (const char *label,
                          unsigned int expected_response_code,
                          const char *coin_reference,
                          const char *melt_reference,
                          const char *amount);


/**
 * Make a "revoke" command.
 *
 * @param label the command label.
 * @param expected_response_code expected HTTP status code.
 * @param coin_reference reference to a CMD that will offer the
 *        denomination to revoke.
 * @param config_filename configuration file name.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_revoke (const char *label,
                          unsigned int expected_response_code,
                          const char *coin_reference,
                          const char *config_filename);


/**
 * Create a "signal" CMD.
 *
 * @param label command label.
 * @param process handle to the process to signal.
 * @param signal signal to send.
 *
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_signal (const char *label,
                          struct GNUNET_OS_Process *process,
                          int signal);


/**
 * Sleep for @a duration_s seconds.
 *
 * @param label command label.
 * @param duration_s number of seconds to sleep
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_sleep (const char *label,
                         unsigned int duration_s);


/**
 * This CMD simply tries to connect via HTTP to the
 * service addressed by @a url.  It attempts 10 times
 * before giving up and make the test fail.
 *
 * @param label label for the command.
 * @param url complete URL to connect to.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_wait_service (const char *label,
                                const char *url);


/**
 * Make a "check keys" command.  This type of command
 * checks whether the number of denomination keys from
 * @a exchange matches @a num_denom_keys.
 *
 * @param label command label
 * @param generation how many /keys responses are expected to
 *        have been returned when this CMD will be run.
 * @param num_denom_keys expected number of denomination keys.
 *
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_check_keys (const char *label,
                              unsigned int generation,
                              unsigned int num_denom_keys);


/**
 * Make a "check keys" command that forcedly does NOT cherry pick;
 * just redownload the whole /keys.  Then checks whether the number
 * of denomination keys from @a exchange matches @a num_denom_keys.
 *
 * @param label command label
 * @param generation when this command is run, exactly @a
 *        generation /keys downloads took place.  If the number
 *        of downloads is less than @a generation, the logic will
 *        first make sure that @a generation downloads are done,
 *        and _then_ execute the rest of the command.
 * @param num_denom_keys expected number of denomination keys.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_check_keys_pull_all_keys (const char *label,
                                            unsigned int generation,
                                            unsigned int num_denom_keys);


/**
 * Make a "check keys" command.  This type of command
 * checks whether the number of denomination keys from
 * @a exchange matches @a num_denom_keys.  Additionally,
 * it lets the user set a last denom issue date to be
 * used in the request for /keys.
 *
 * @param label command label
 * @param generation when this command is run, exactly @a
 *        generation /keys downloads took place.  If the number
 *        of downloads is less than @a generation, the logic will
 *        first make sure that @a generation downloads are done,
 *        and _then_ execute the rest of the command.
 * @param num_denom_keys expected number of denomination keys.
 * @param last_denom_date date to be set in the "last_denom_issue"
 *        URL parameter of /keys.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_check_keys_with_last_denom (const char *label,
                                              unsigned int generation,
                                              unsigned int num_denom_keys,
                                              struct GNUNET_TIME_Absolute
                                              last_denom_date);


/**
 * Create a "batch" command.  Such command takes a
 * end_CMD-terminated array of CMDs and executed them.
 * Once it hits the end CMD, it passes the control
 * to the next top-level CMD, regardless of it being
 * another batch or ordinary CMD.
 *
 * @param label the command label.
 * @param batch array of CMDs to execute.
 *
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_batch (const char *label,
                         struct TALER_TESTING_Command *batch);


/**
 * Test if this command is a batch command.
 *
 * @return false if not, true if it is a batch command
 */
int
TALER_TESTING_cmd_is_batch (const struct TALER_TESTING_Command *cmd);

/**
 * Advance internal pointer to next command.
 *
 * @param is interpreter state.
 */
void
TALER_TESTING_cmd_batch_next (struct TALER_TESTING_Interpreter *is);

/**
 * Obtain what command the batch is at.
 *
 * @return cmd current batch command
 */
struct TALER_TESTING_Command *
TALER_TESTING_cmd_batch_get_current (const struct TALER_TESTING_Command *cmd);


/**
 * Set what command the batch should be at.
 *
 * @param cmd current batch command
 * @param new_ip where to move the IP
 */
void
TALER_TESTING_cmd_batch_set_current (const struct TALER_TESTING_Command *cmd,
                                     unsigned int new_ip);


/**
 * Make a serialize-keys CMD.
 *
 * @param label CMD label
 * @return the CMD.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_serialize_keys (const char *label);


/**
 * Make a connect-with-state CMD.  This command
 * will use a serialized key state to reconnect
 * to the exchange.
 *
 * @param label command label
 * @param state_reference label of a CMD offering
 *        a serialized key state.
 * @return the CMD.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_connect_with_state (const char *label,
                                      const char *state_reference);

/**
 * Make the "insert-deposit" CMD.
 *
 * @param label command label.
 * @param dbc collects plugin and session handles
 * @param merchant_name Human-readable name of the merchant.
 * @param merchant_account merchant's account name (NOT a payto:// URI)
 * @param exchange_timestamp when did the exchange receive the deposit
 * @param wire_deadline point in time where the aggregator should have
 *        wired money to the merchant.
 * @param amount_with_fee amount to deposit (inclusive of deposit fee)
 * @param deposit_fee deposit fee
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_insert_deposit (
  const char *label,
  const struct TALER_TESTING_DatabaseConnection *dbc,
  const char *merchant_name,
  const char *merchant_account,
  struct GNUNET_TIME_Absolute exchange_timestamp,
  struct GNUNET_TIME_Relative wire_deadline,
  const char *amount_with_fee,
  const char *deposit_fee);


/**
 * Performance counter.
 */
struct TALER_TESTING_Timer
{
  /**
   * For which type of commands.
   */
  const char *prefix;

  /**
   * Total time spend in all commands of this type.
   */
  struct GNUNET_TIME_Relative total_duration;

  /**
   * Total time spend waiting for the *successful* exeuction
   * in all commands of this type.
   */
  struct GNUNET_TIME_Relative success_latency;

  /**
   * Number of commands summed up.
   */
  unsigned int num_commands;

  /**
   * Number of retries summed up.
   */
  unsigned int num_retries;
};


/**
 * Obtain performance data from the interpreter.
 *
 * @param timers what commands (by label) to obtain runtimes for
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_stat (struct TALER_TESTING_Timer *timers);


/**
 * Add the auditor to the exchange's list of auditors.
 * The information about the auditor is taken from the
 * "[auditor]" section in the configuration file.
 *
 * @param label command label.
 * @param expected_http_status expected HTTP status from exchange
 * @param bad_sig should we use a bogus signature?
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_auditor_add (const char *label,
                               unsigned int expected_http_status,
                               bool bad_sig);


/**
 * Remove the auditor from the exchange's list of auditors.
 * The information about the auditor is taken from the
 * "[auditor]" section in the configuration file.
 *
 * @param label command label.
 * @param expected_http_status expected HTTP status from exchange
 * @param bad_sig should we use a bogus signature?
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_auditor_del (const char *label,
                               unsigned int expected_http_status,
                               bool bad_sig);


/**
 * Add affirmation that the auditor is auditing the given
 * denomination.
 * The information about the auditor is taken from the
 * "[auditor]" section in the configuration file.
 *
 * @param label command label.
 * @param expected_http_status expected HTTP status from exchange
 * @param denom_ref reference to a command identifying a denomination key
 * @param bad_sig should we use a bogus signature?
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_auditor_add_denom_sig (const char *label,
                                         unsigned int expected_http_status,
                                         const char *denom_ref,
                                         bool bad_sig);

/**
 * Add statement about wire fees of the exchange. This is always
 * done for a few hours around the current time (for the test).
 *
 * @param label command label.
 * @param wire_method wire method to set wire fees for
 * @param wire_fee the wire fee to affirm
 * @param closing_fee the closing fee to affirm
 * @param expected_http_status expected HTTP status from exchange
 * @param bad_sig should we use a bogus signature?
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_set_wire_fee (const char *label,
                                const char *wire_method,
                                const char *wire_fee,
                                const char *closing_fee,
                                unsigned int expected_http_status,
                                bool bad_sig);


/**
 * Add the given payto-URI bank account to the list of bank
 * accounts used by the exchange.
 *
 * @param label command label.
 * @param payto_uri URI identifying the bank account
 * @param expected_http_status expected HTTP status from exchange
 * @param bad_sig should we use a bogus signature?
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_wire_add (const char *label,
                            const char *payto_uri,
                            unsigned int expected_http_status,
                            bool bad_sig);


/**
 * Remove the given payto-URI bank account from the list of bank
 * accounts used by the exchange.
 *
 * @param label command label.
 * @param payto_uri URI identifying the bank account
 * @param expected_http_status expected HTTP status from exchange
 * @param bad_sig should we use a bogus signature?
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_wire_del (const char *label,
                            const char *payto_uri,
                            unsigned int expected_http_status,
                            bool bad_sig);


/**
 * Sign all exchange denomination and online signing keys
 * with the "offline" key and provide those signatures to
 * the exchange. (Downloads the keys, makes the signature
 * and uploads the result, all in one.)
 *
 * @param label command label.
 * @param config_filename configuration filename.
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_offline_sign_keys (const char *label,
                                     const char *config_filename);


/**
 * Revoke an exchange denomination key.
 *
 * @param label command label.
 * @param expected_response_code expected HTTP status from exchange
 * @param bad_sig should we use a bogus signature?
 * @param denom_ref reference to a command that identifies
 *        a denomination key (i.e. because it was used to
 *        withdraw a coin).
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_revoke_denom_key (
  const char *label,
  unsigned int expected_response_code,
  bool bad_sig,
  const char *denom_ref);


/**
 * Revoke an exchange online signing key.
 *
 * @param label command label.
 * @param expected_response_code expected HTTP status from exchange
 * @param bad_sig should we use a bogus signature?
 * @param signkey_ref reference to a command that identifies
 *        a signing key (i.e. because it was used to
 *        sign a deposit confirmation).
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_revoke_sign_key (
  const char *label,
  unsigned int expected_response_code,
  bool bad_sig,
  const char *signkey_ref);


/**
 * Have the auditor affirm that it is auditing the given
 * denomination key and upload the auditor's signature to
 * the exchange.
 *
 * @param label command label.
 * @param expected_http_status expected HTTP status from exchange
 * @param denom_ref reference to a command that identifies
 *        a denomination key (i.e. because it was used to
 *        withdraw a coin).
 * @param bad_sig should we use a bogus signature?
 * @return the command
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_auditor_add_denom_sig (const char *label,
                                         unsigned int expected_http_status,
                                         const char *denom_ref,
                                         bool bad_sig);


/* *** Generic trait logic for implementing traits ********* */

/**
 * A trait.
 */
struct TALER_TESTING_Trait
{
  /**
   * Index number associated with the trait.  This gives the
   * possibility to have _multiple_ traits on offer under the
   * same name.
   */
  unsigned int index;

  /**
   * Trait type, for example "reserve-pub" or "coin-priv".
   */
  const char *trait_name;

  /**
   * Pointer to the piece of data to offer.
   */
  const void *ptr;
};


/**
 * "end" trait.  Because traits are offered into arrays,
 * this type of trait is used to mark the end of such arrays;
 * useful when iterating over those.
 */
struct TALER_TESTING_Trait
TALER_TESTING_trait_end (void);


/**
 * Extract a trait.
 *
 * @param traits the array of all the traits.
 * @param[out] ret where to store the result.
 * @param trait type of the trait to extract.
 * @param index index number of the trait to extract.
 * @return #GNUNET_OK when the trait is found.
 */
int
TALER_TESTING_get_trait (const struct TALER_TESTING_Trait *traits,
                         const void **ret,
                         const char *trait,
                         unsigned int index);


/* ****** Specific traits supported by this component ******* */


/**
 * Obtain a bank transaction row value from @a cmd.
 *
 * @param cmd command to extract the number from.
 * @param[out] row set to the number coming from @a cmd.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_bank_row (const struct TALER_TESTING_Command *cmd,
                                  const uint64_t **row);


/**
 * Offer bank transaction row trait.
 *
 * @param row number to offer.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_bank_row (const uint64_t *row);


/**
 * Offer a reserve private key.
 *
 * @param index reserve priv's index number.
 * @param reserve_priv reserve private key to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_reserve_priv (
  unsigned int index,
  const struct TALER_ReservePrivateKeyP *reserve_priv);


/**
 * Obtain a reserve private key from a @a cmd.
 *
 * @param cmd command to extract the reserve priv from.
 * @param index reserve priv's index number.
 * @param[out] reserve_priv set to the reserve priv.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_reserve_priv (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_ReservePrivateKeyP **reserve_priv);


/**
 * Offer a reserve public key.
 *
 * @param index reserve pubs's index number.
 * @param reserve_pub reserve public key to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_reserve_pub (
  unsigned int index,
  const struct TALER_ReservePublicKeyP *reserve_pub);


/**
 * Obtain a reserve public key from a @a cmd.
 *
 * @param cmd command to extract the reserve pub from.
 * @param index reserve pub's index number.
 * @param[out] reserve_pub set to the reserve pub.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_reserve_pub (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_ReservePublicKeyP **reserve_pub);


/**
 * Offer a reserve history entry.
 *
 * @param index reserve pubs's index number.
 * @param rh reserve history entry to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_reserve_history (
  unsigned int index,
  const struct TALER_EXCHANGE_ReserveHistory *rh);


/**
 * Obtain a reserve history entry from a @a cmd.
 *
 * @param cmd command to extract the reserve history from.
 * @param index reserve history's index number.
 * @param[out] rhp set to the reserve history.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_reserve_history (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_EXCHANGE_ReserveHistory **rhp);


/**
 * Make a trait for a exchange signature.
 *
 * @param index index number to associate to the offered exchange pub.
 * @param exchange_sig exchange signature to offer with this trait.
 *
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_exchange_sig (
  unsigned int index,
  const struct TALER_ExchangeSignatureP *exchange_sig);


/**
 * Obtain a exchange signature (online sig) from a @a cmd.
 *
 * @param cmd command to extract trait from
 * @param index index number of the exchange to obtain.
 * @param[out] exchange_sig set to the offered exchange signature.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_exchange_sig (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_ExchangeSignatureP **exchange_sig);


/**
 * Make a trait for a exchange public key.
 *
 * @param index index number to associate to the offered exchange pub.
 * @param exchange_pub exchange pub to offer with this trait.
 *
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_exchange_pub (
  unsigned int index,
  const struct TALER_ExchangePublicKeyP *exchange_pub);


/**
 * Obtain a exchange public key from a @a cmd.
 *
 * @param cmd command to extract trait from
 * @param index index number of the exchange to obtain.
 * @param[out] exchange_pub set to the offered exchange pub.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_exchange_pub (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_ExchangePublicKeyP **exchange_pub);


/**
 * Obtain location where a command stores a pointer to a process.
 *
 * @param cmd command to extract trait from.
 * @param index which process to pick if @a cmd
 *        has multiple on offer.
 * @param[out] processp set to the address of the pointer to the
 *        process.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_process (const struct TALER_TESTING_Command *cmd,
                                 unsigned int index,
                                 struct GNUNET_OS_Process ***processp);


/**
 * Offer location where a command stores a pointer to a process.
 *
 * @param index offered location index number, in case there are
 *        multiple on offer.
 * @param processp process location to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_process (unsigned int index,
                                  struct GNUNET_OS_Process **processp);


/**
 * Offer coin private key.
 *
 * @param index index number to associate with offered coin priv.
 * @param coin_priv coin private key to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_coin_priv (
  unsigned int index,
  const struct TALER_CoinSpendPrivateKeyP *coin_priv);

/**
 * Obtain a coin private key from a @a cmd.
 *
 * @param cmd command to extract trait from.
 * @param index index of the coin priv to obtain.
 * @param[out] coin_priv set to the private key of the coin.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_coin_priv (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_CoinSpendPrivateKeyP **coin_priv);


/**
 * Offer blinding key.
 *
 * @param index index number to associate to the offered key.
 * @param blinding_key blinding key to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_blinding_key (
  unsigned int index,
  const struct TALER_DenominationBlindingKeyP *blinding_key);


/**
 * Obtain a blinding key from a @a cmd.
 *
 * @param cmd command to extract trait from
 * @param index which coin to pick if @a cmd has multiple on offer.
 * @param[out] blinding_key set to the offered blinding key.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_blinding_key (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_DenominationBlindingKeyP **blinding_key);


/**
 * Make a trait for a denomination public key.
 *
 * @param index index number to associate to the offered denom pub.
 * @param denom_pub denom pub to offer with this trait.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_denom_pub (
  unsigned int index,
  const struct TALER_EXCHANGE_DenomPublicKey *dpk);


/**
 * Obtain a denomination public key from a @a cmd.
 *
 * @param cmd command to extract trait from
 * @param index index number of the denom to obtain.
 * @param[out] denom_pub set to the offered denom pub.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_denom_pub (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_EXCHANGE_DenomPublicKey **dpk);


/**
 * Obtain a denomination signature from a @a cmd.
 *
 * @param cmd command to extract the denom sig from.
 * @param index index number associated with the denom sig.
 * @param[out] denom_sig set to the offered signature.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_denom_sig (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_DenominationSignature **dpk);


/**
 * Offer denom sig.
 *
 * @param index index number to associate to the signature on
 *        offer.
 * @param denom_sig the denom sig on offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_denom_sig (
  unsigned int index,
  const struct TALER_DenominationSignature *sig);


/**
 * Offer number trait, 32-bit version.
 *
 * @param index the number's index number.
 * @param n number to offer.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_uint32 (unsigned int index,
                                 const uint32_t *n);


/**
 * Obtain a "number" value from @a cmd, 32-bit version.
 *
 * @param cmd command to extract the number from.
 * @param index the number's index number.
 * @param[out] n set to the number coming from @a cmd.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_uint32 (const struct TALER_TESTING_Command *cmd,
                                unsigned int index,
                                const uint32_t **n);


/**
 * Offer number trait, 64-bit version.
 *
 * @param index the number's index number.
 * @param n number to offer.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_uint64 (unsigned int index,
                                 const uint64_t *n);


/**
 * Obtain a "number" value from @a cmd, 64-bit version.
 *
 * @param cmd command to extract the number from.
 * @param index the number's index number.
 * @param[out] n set to the number coming from @a cmd.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_uint64 (const struct TALER_TESTING_Command *cmd,
                                unsigned int index,
                                const uint64_t **n);


/**
 * Offer number trait, 64-bit signed version.
 *
 * @param index the number's index number.
 * @param n number to offer.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_int64 (unsigned int index,
                                const int64_t *n);


/**
 * Obtain a "number" value from @a cmd, 64-bit signed version.
 *
 * @param cmd command to extract the number from.
 * @param index the number's index number.
 * @param[out] n set to the number coming from @a cmd.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_int64 (const struct TALER_TESTING_Command *cmd,
                               unsigned int index,
                               const int64_t **n);


/**
 * Offer a number.
 *
 * @param index the number's index number.
 * @param n the number to offer.
 * @return #GNUNET_OK on success.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_uint (unsigned int index,
                               const unsigned int *i);


/**
 * Obtain a number from @a cmd.
 *
 * @param cmd command to extract the number from.
 * @param index the number's index number.
 * @param[out] n set to the number coming from @a cmd.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_uint (const struct TALER_TESTING_Command *cmd,
                              unsigned int index,
                              const unsigned int **n);


/**
 * Opaque handle to fresh coins generated during refresh.
 * Details are internal to the refresh logic.
 */
struct TALER_TESTING_FreshCoinData;


/**
 * Offer a _array_ of fresh coins.
 *
 * @param index which array of fresh coins to offer,
 *        if there are multiple on offer.  Typically passed as
 *        zero.
 * @param fresh_coins the array of fresh coins to offer
 * @return the trait,
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_fresh_coins (
  unsigned int index,
  const struct TALER_TESTING_FreshCoinData *fresh_coins);


/**
 * Get a array of fresh coins.
 *
 * @param cmd command to extract the fresh coin from.
 * @param index which array to pick if @a cmd has multiple
 *        on offer.
 * @param[out] fresh_coins will point to the offered array.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_fresh_coins (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_TESTING_FreshCoinData **fresh_coins);


/**
 * Obtain contract terms from @a cmd.
 *
 * @param cmd command to extract the contract terms from.
 * @param index contract terms index number.
 * @param[out] contract_terms where to write the contract
 *        terms.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_contract_terms (const struct TALER_TESTING_Command *cmd,
                                        unsigned int index,
                                        const json_t **contract_terms);


/**
 * Offer contract terms.
 *
 * @param index contract terms index number.
 * @param contract_terms contract terms to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_contract_terms (unsigned int index,
                                         const json_t *contract_terms);


/**
 * Obtain wire details from @a cmd.
 *
 * @param cmd command to extract the wire details from.
 * @param index index number associate with the wire details
 *        on offer; usually zero, as one command sticks to
 *        one bank account.
 * @param[out] wire_details where to write the wire details.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_wire_details (const struct TALER_TESTING_Command *cmd,
                                      unsigned int index,
                                      const json_t **wire_details);


/**
 * Offer wire details in a trait.
 *
 * @param index index number associate with the wire details
 *        on offer; usually zero, as one command sticks to
 *        one bank account.
 * @param wire_details wire details to offer.
 *
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_wire_details (unsigned int index,
                                       const json_t *wire_details);


/**
 * Obtain serialized exchange keys from @a cmd.
 *
 * @param cmd command to extract the keys from.
 * @param index index number associate with the keys on offer.
 * @param[out] keys where to write the serialized keys.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_exchange_keys (const struct TALER_TESTING_Command *cmd,
                                       unsigned int index,
                                       const json_t **keys);


/**
 * Offer serialized keys in a trait.
 *
 * @param index index number associate with the serial keys
 *        on offer.
 * @param keys serialized keys to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_exchange_keys (unsigned int index,
                                        const json_t *keys);


/**
 * Obtain json from @a cmd.
 *
 * @param cmd command to extract the json from.
 * @param index index number associate with the json on offer.
 * @param[out] json where to write the json.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_json (const struct TALER_TESTING_Command *cmd,
                              unsigned int index,
                              const json_t **json);


/**
 * Offer json in a trait.
 *
 * @param index index number associate with the json
 *        on offer.
 * @param json json to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_json (unsigned int index,
                               const json_t *json);


/**
 * Obtain a private key from a "merchant".  Used e.g. to obtain
 * a merchant's priv to sign a /track request.
 *
 * @param cmd command that is offering the key.
 * @param index (typically zero) which key to return if there
 *        are multiple on offer.
 * @param[out] priv set to the key coming from @a cmd.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_merchant_priv (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_MerchantPrivateKeyP **priv);


/**
 * Offer private key of a merchant, typically done when CMD_1 needs it to
 * sign a request.
 *
 * @param index (typically zero) which key to return if there are
 *        multiple on offer.
 * @param priv which object should be offered.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_merchant_priv (
  unsigned int index,
  const struct TALER_MerchantPrivateKeyP *priv);


/**
 * Obtain a public key from a "merchant".  Used e.g. to obtain
 * a merchant's public key to use backend's API.
 *
 * @param cmd command offering the key.
 * @param index (typically zero) which key to return if there
 *        are multiple on offer.
 * @param[out] pub set to the key coming from @a cmd.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_merchant_pub (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_MerchantPublicKeyP **pub);


/**
 * Offer public key.
 *
 * @param index (typically zero) which key to return if there
 *        are multiple on offer.  NOTE: if one key is offered, it
 *        is mandatory to set this as zero.
 * @param pub which object should be returned.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_merchant_pub (
  unsigned int index,
  const struct TALER_MerchantPublicKeyP *pub);


/**
 * Obtain a string from @a cmd.
 *
 * @param cmd command to extract the subject from.
 * @param index index number associated with the transfer
 *        subject to offer.
 * @param[out] s where to write the offered
 *        string.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_string (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const char **s);


/**
 * Offer string subject.
 *
 * @param index index number associated with the transfer
 *        subject being offered.
 * @param s string to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_string (unsigned int index,
                                 const char *s);


/**
 * Obtain a WTID value from @a cmd.
 *
 * @param cmd command to extract trait from
 * @param index which WTID to pick if @a cmd has multiple on
 *        offer
 * @param[out] wtid set to the wanted WTID.
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_get_trait_wtid (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct TALER_WireTransferIdentifierRawP **wtid);


/**
 * Offer a WTID.
 *
 * @param index associate the WTID with this index.
 * @param wtid pointer to the WTID to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_wtid (
  unsigned int index,
  const struct TALER_WireTransferIdentifierRawP *wtid);


/**
 * Different types of URLs that appear in traits.
 */
enum TALER_TESTING_URL_Type
{
  /**
   * Category of last resort. Should not be used.
   */
  TALER_TESTING_UT_UNDEFINED = 0,

  /**
   * HTTP base URL of an exchange (API), as for example
   * given in wire transfers subjects made by the aggregator.
   */
  TALER_TESTING_UT_EXCHANGE_BASE_URL = 1,

  /**
   * HTTP URL of the exchange's bank account at the bank.
   */
  TALER_TESTING_UT_EXCHANGE_BANK_ACCOUNT_URL = 2
};


/**
 * Offer HTTP url in a trait.
 *
 * @param index which url is to be picked,
 *        in case multiple are offered.
 * @param url the url to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_url (enum TALER_TESTING_URL_Type index,
                              const char *url);


/**
 * Obtain a HTTP url from @a cmd.
 *
 * @param cmd command to extract the url from.
 * @param index which url is to be picked, in case
 *        multiple are offered.
 * @param[out] url where to write the url.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_url (const struct TALER_TESTING_Command *cmd,
                             enum TALER_TESTING_URL_Type index,
                             const char **url);


/**
 * Used as the "index" in payto traits, to identify what kind of
 * payto URL we are returning.
 */
enum TALER_TESTING_PaytoType
{
  /**
   * We don't know / not credit or debit.
   */
  TALER_TESTING_PT_NEUTRAL,
  /**
   * Credit side of a transaction.
   */
  TALER_TESTING_PT_CREDIT,
  /**
   * Debit side of a transaction.
   */
  TALER_TESTING_PT_DEBIT
};


/**
 * Offer a payto uri in a trait.
 *
 * @param pt which url is to be picked,
 *        in case multiple are offered.
 * @param payto_uri the uri to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_payto (enum TALER_TESTING_PaytoType pt,
                                const char *payto_uri);


/**
 * Obtain a PAYTO url from @a cmd.
 *
 * @param cmd command to extract the url from.
 * @param pt which url is to be picked, in case
 *        multiple are offered.
 * @param[out] url where to write the url.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_payto (const struct TALER_TESTING_Command *cmd,
                               enum TALER_TESTING_PaytoType pt,
                               const char **url);


/**
 * Obtain a order id from @a cmd.
 *
 * @param cmd command to extract the order id from.
 * @param index which order id is to be picked, in case
 *        multiple are offered.
 * @param[out] order_id where to write the order id.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_order_id (const struct TALER_TESTING_Command *cmd,
                                  unsigned int index,
                                  const char **order_id);


/**
 * Offer order id in a trait.
 *
 * @param index which order id is to be offered,
 *        in case multiple are offered.
 * @param order_id the order id to offer.
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_order_id (unsigned int index,
                                   const char *order_id);


/**
 * Obtain an amount from a @a cmd.
 *
 * @param cmd command to extract the amount from.
 * @param index which amount to pick if @a cmd has multiple
 *        on offer
 * @param[out] amount set to the amount.
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_get_trait_amount_obj (const struct TALER_TESTING_Command *cmd,
                                    unsigned int index,
                                    const struct TALER_Amount **amount);


/**
 * Offer amount.
 *
 * @param index which amount to offer, in case there are
 *        multiple available.
 * @param amount the amount to offer.
 *
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_amount_obj (unsigned int index,
                                     const struct TALER_Amount *amount);


/**
 * Offer a command in a trait.
 *
 * @param index always zero.  Commands offering this
 *        kind of traits do not need this index.  For
 *        example, a "meta" CMD returns always the
 *        CMD currently being executed.
 * @param cmd wire details to offer.
 *
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_cmd (unsigned int index,
                              const struct TALER_TESTING_Command *cmd);


/**
 * Obtain a command from @a cmd.
 *
 * @param cmd command to extract the command from.
 * @param index always zero.  Commands offering this
 *        kind of traits do not need this index.  For
 *        example, a "meta" CMD returns always the
 *        CMD currently being executed.
 * @param[out] _cmd where to write the wire details.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_cmd (const struct TALER_TESTING_Command *cmd,
                             unsigned int index,
                             struct TALER_TESTING_Command **_cmd);


/**
 * Obtain a uuid from @a cmd.
 *
 * @param cmd command to extract the uuid from.
 * @param index which amount to pick if @a cmd has multiple
 *        on offer
 * @param[out] uuid where to write the uuid.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_uuid (const struct TALER_TESTING_Command *cmd,
                              unsigned int index,
                              struct GNUNET_Uuid **uuid);


/**
 * Offer a uuid in a trait.
 *
 * @param index which uuid to offer, in case there are
 *        multiple available.
 * @param uuid the uuid to offer.
 *
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_uuid (unsigned int index,
                               const struct GNUNET_Uuid *uuid);


/**
 * Obtain a claim token from @a cmd.
 *
 * @param cmd command to extract the token from.
 * @param index which amount to pick if @a cmd has multiple
 *        on offer
 * @param[out] ct where to write the token.
 * @return #GNUNET_OK on success.
 */
int
TALER_TESTING_get_trait_claim_token (const struct TALER_TESTING_Command *cmd,
                                     unsigned int index,
                                     const struct TALER_ClaimTokenP **ct);


/**
 * Offer a claim token in a trait.
 *
 * @param index which token to offer, in case there are
 *        multiple available.
 * @param ct the token to offer.
 *
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_claim_token (unsigned int index,
                                      const struct TALER_ClaimTokenP *ct);


/**
 * Obtain a absolute time from @a cmd.
 *
 * @param cmd command to extract trait from
 * @param index which time stamp to pick if
 *        @a cmd has multiple on offer.
 * @param[out] time set to the wanted WTID.
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_get_trait_absolute_time (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct GNUNET_TIME_Absolute **time);


/**
 * Offer a absolute time.
 *
 * @param index associate the object with this index
 * @param time which object should be returned
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_absolute_time (
  unsigned int index,
  const struct GNUNET_TIME_Absolute *time);


/**
 * Obtain a relative time from @a cmd.
 *
 * @param cmd command to extract trait from
 * @param index which time to pick if
 *        @a cmd has multiple on offer.
 * @param[out] time set to the wanted WTID.
 * @return #GNUNET_OK on success
 */
int
TALER_TESTING_get_trait_relative_time (
  const struct TALER_TESTING_Command *cmd,
  unsigned int index,
  const struct GNUNET_TIME_Relative **time);


/**
 * Offer a relative time.
 *
 * @param index associate the object with this index
 * @param time which object should be returned
 * @return the trait.
 */
struct TALER_TESTING_Trait
TALER_TESTING_make_trait_relative_time (
  unsigned int index,
  const struct GNUNET_TIME_Relative *time);

#endif