Add basic coverage reporting for RPC tests

Thanks to @MarcoFalke @dexX7 @laanwj for review.

1 files changed, 152 insertions, 30 deletions

diff --git a/qa/pull-tester/rpc-tests.py b/qa/pull-tester/rpc-tests.py
index 3059fee426..891962ac14 100755
--- a/qa/pull-tester/rpc-tests.py
+++ b/qa/pull-tester/rpc-tests.py
@@ -3,16 +3,32 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#
-# Run Regression Test Suite
-#
+"""
+Run Regression Test Suite
+
+This module calls down into individual test cases via subprocess. It will
+forward all unrecognized arguments onto the individual test scripts, other
+than:
+
+    - `-extended`: run the "extended" test suite in addition to the basic one.
+    - `-win`: signal that this is running in a Windows environment, and we
+      should run the tests.
+    - `--coverage`: this generates a basic coverage report for the RPC
+      interface.
+
+For a description of arguments recognized by test scripts, see
+`qa/pull-tester/test_framework/test_framework.py:BitcoinTestFramework.main`.
+
+"""
 
 import os
+import shutil
 import sys
 import subprocess
+import tempfile
 import re
+
 from tests_config import *
-from sets import Set
 
 #If imported values are not defined then set to zero (or disabled)
 if not vars().has_key('ENABLE_WALLET'):
@@ -24,15 +40,20 @@ if not vars().has_key('ENABLE_UTILS'):
 if not vars().has_key('ENABLE_ZMQ'):
     ENABLE_ZMQ=0
 
+ENABLE_COVERAGE=0
+
 #Create a set to store arguments and create the passOn string
-opts = Set()
+opts = set()
 passOn = ""
 p = re.compile("^--")
-for i in range(1,len(sys.argv)):
-    if (p.match(sys.argv[i]) or sys.argv[i] == "-h"):
-        passOn += " " + sys.argv[i]
+
+for arg in sys.argv[1:]:
+    if arg == '--coverage':
+        ENABLE_COVERAGE = 1
+    elif (p.match(arg) or arg == "-h"):
+        passOn += " " + arg
     else:
-        opts.add(sys.argv[i])
+        opts.add(arg)
 
 #Set env vars
 buildDir = BUILDDIR
@@ -97,24 +118,125 @@ testScriptsExt = [
 if ENABLE_ZMQ == 1:
     testScripts.append('zmq_test.py')
 
-if(ENABLE_WALLET == 1 and ENABLE_UTILS == 1 and ENABLE_BITCOIND == 1):
-    rpcTestDir = buildDir + '/qa/rpc-tests/'
-    #Run Tests
-    for i in range(len(testScripts)):
-       if (len(opts) == 0 or (len(opts) == 1 and "-win" in opts ) or '-extended' in opts
-           or testScripts[i] in opts or  re.sub(".py$", "", testScripts[i]) in opts ):
-            print  "Running testscript " + testScripts[i] + "..."
-            subprocess.check_call(rpcTestDir + testScripts[i] + " --srcdir " + buildDir + '/src ' + passOn,shell=True)
-	    #exit if help is called so we print just one set of instructions
-            p = re.compile(" -h| --help")
-            if p.match(passOn):
-                sys.exit(0)
-
-    #Run Extended Tests
-    for i in range(len(testScriptsExt)):
-        if ('-extended' in opts or testScriptsExt[i] in opts
-           or re.sub(".py$", "", testScriptsExt[i]) in opts):
-            print  "Running 2nd level testscript " + testScriptsExt[i] + "..."
-            subprocess.check_call(rpcTestDir + testScriptsExt[i] + " --srcdir " + buildDir + '/src ' + passOn,shell=True)
-else:
-    print "No rpc tests to run. Wallet, utils, and bitcoind must all be enabled"
+
+def runtests():
+    coverage = None
+
+    if ENABLE_COVERAGE:
+        coverage = RPCCoverage()
+        print("Initializing coverage directory at %s" % coverage.dir)
+
+    if(ENABLE_WALLET == 1 and ENABLE_UTILS == 1 and ENABLE_BITCOIND == 1):
+        rpcTestDir = buildDir + '/qa/rpc-tests/'
+        run_extended = '-extended' in opts
+        cov_flag = coverage.flag if coverage else ''
+        flags = " --srcdir %s/src %s %s" % (buildDir, cov_flag, passOn)
+
+        #Run Tests
+        for i in range(len(testScripts)):
+            if (len(opts) == 0
+                    or (len(opts) == 1 and "-win" in opts )
+                    or run_extended
+                    or testScripts[i] in opts
+                    or re.sub(".py$", "", testScripts[i]) in opts ):
+                print("Running testscript " + testScripts[i] + "...")
+
+                subprocess.check_call(
+                    rpcTestDir + testScripts[i] + flags, shell=True)
+
+                # exit if help is called so we print just one set of
+                # instructions
+                p = re.compile(" -h| --help")
+                if p.match(passOn):
+                    sys.exit(0)
+
+        # Run Extended Tests
+        for i in range(len(testScriptsExt)):
+            if (run_extended or testScriptsExt[i] in opts
+                    or re.sub(".py$", "", testScriptsExt[i]) in opts):
+                print(
+                    "Running 2nd level testscript "
+                    + testScriptsExt[i] + "...")
+
+                subprocess.check_call(
+                    rpcTestDir + testScriptsExt[i] + flags, shell=True)
+
+        if coverage:
+            coverage.report_rpc_coverage()
+
+            print("Cleaning up coverage data")
+            coverage.cleanup()
+
+    else:
+        print "No rpc tests to run. Wallet, utils, and bitcoind must all be enabled"
+
+
+class RPCCoverage(object):
+    """
+    Coverage reporting utilities for pull-tester.
+
+    Coverage calculation works by having each test script subprocess write
+    coverage files into a particular directory. These files contain the RPC
+    commands invoked during testing, as well as a complete listing of RPC
+    commands per `bitcoin-cli help` (`rpc_interface.txt`).
+
+    After all tests complete, the commands run are combined and diff'd against
+    the complete list to calculate uncovered RPC commands.
+
+    See also: qa/rpc-tests/test_framework/coverage.py
+
+    """
+    def __init__(self):
+        self.dir = tempfile.mkdtemp(prefix="coverage")
+        self.flag = '--coveragedir %s' % self.dir
+
+    def report_rpc_coverage(self):
+        """
+        Print out RPC commands that were unexercised by tests.
+
+        """
+        uncovered = self._get_uncovered_rpc_commands()
+
+        if uncovered:
+            print("Uncovered RPC commands:")
+            print("".join(("  - %s\n" % i) for i in sorted(uncovered)))
+        else:
+            print("All RPC commands covered.")
+
+    def cleanup(self):
+        return shutil.rmtree(self.dir)
+
+    def _get_uncovered_rpc_commands(self):
+        """
+        Return a set of currently untested RPC commands.
+
+        """
+        # This is shared from `qa/rpc-tests/test-framework/coverage.py`
+        REFERENCE_FILENAME = 'rpc_interface.txt'
+        COVERAGE_FILE_PREFIX = 'coverage.'
+
+        coverage_ref_filename = os.path.join(self.dir, REFERENCE_FILENAME)
+        coverage_filenames = set()
+        all_cmds = set()
+        covered_cmds = set()
+
+        if not os.path.isfile(coverage_ref_filename):
+            raise RuntimeError("No coverage reference found")
+
+        with open(coverage_ref_filename, 'r') as f:
+            all_cmds.update([i.strip() for i in f.readlines()])
+
+        for root, dirs, files in os.walk(self.dir):
+            for filename in files:
+                if filename.startswith(COVERAGE_FILE_PREFIX):
+                    coverage_filenames.add(os.path.join(root, filename))
+
+        for filename in coverage_filenames:
+            with open(filename, 'r') as f:
+                covered_cmds.update([i.strip() for i in f.readlines()])
+
+        return all_cmds - covered_cmds
+
+
+if __name__ == '__main__':
+    runtests()