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2019-04-09[build] Add several util unitsJohn Newbery
Adds the following util units and adds them to libbitcoin_util: - `util/url.cpp` takes `urlDecode` from `httpserver.cpp` - `util/error.cpp` takes `TransactionErrorString` from `node/transaction.cpp` and `AmountHighWarn` and `AmountErrMsg` from `ui_interface.cpp` - `util/fees.cpp` takes `StringForFeeReason` and `FeeModeFromString` from `policy/fees.cpp` - `util/rbf.cpp` takes `SignalsOptInRBF` from `policy/rbf.cpp` - 'util/validation.cpp` takes `FormatStateMessage` and `strMessageMagic` from 'validation.cpp`
2019-04-09[build] Move policy settings to new src/policy/settings unitJohn Newbery
This moves the following policy settings functions and globals to a new src/policy/settings unit in lib_server: - `incrementalRelayFee` - `dustRelayFee` - `nBytesPerSigOp` - `fIsBareMultisigStd` These settings are only required by the node and should not be accessed by other libraries.
2019-04-10Merge #15632: Remove ResendWalletTransactions from the Validation InterfaceMeshCollider
833d98ae0 [wallet] Remove unnecessary Chain::Lock parameter from ResendWalletTransactions (John Newbery) 52b760fc6 [wallet] Schedule tx rebroadcasts in wallet (John Newbery) f463cd107 [wallet] Keep track of the best block time in the wallet (John Newbery) Pull request description: Remove the `Broadcast()`/`ResendWalletTransactions()` notification from the Validation interface. Closes #15619. See that issue for discussion. ACKs for commit 833d98: ryanofsky: utACK 833d98ae073daf0f25f786f043f2ffa85155c8ff. No changes, just rebase. Tree-SHA512: 7689f2083608ebad8c95ab6692f7842754e1ebe5508bc926a89cad7105cce41007648f37341ba5feb92b30a7aa87acd3abf264a4f1874e35a7161553f6ff3595
2019-04-09Merge #15771: qa: Prevent concurrency issues reading .cookie fileMarcoFalke
90bce24576 qa: Prevent concurrency issues reading .cookie file (João Barbosa) Pull request description: Hopefully fixes #15733. ACKs for commit 90bce2: Tree-SHA512: 4db06a63bb57e8ae56a4eab9d352a9a8d66dd7425cf491ca5f9e1ec5e60e61cb5af9eedbd32a0a9f9bdd770d767adf499eed05dd03221686eb357f6417441b61
2019-04-09[wallet] Schedule tx rebroadcasts in walletJohn Newbery
Removes the now-unused Broadcast/ResendWalletTransactions interface from validationinterface. The wallet_resendwallettransactions.py needs a sleep added at the start to make sure that the rebroadcast scheduler is warmed up before the next block is mined.
2019-04-09qa: Prevent concurrency issues reading .cookie fileJoão Barbosa
2019-04-09Merge #15772: test: Properly log named args in authproxyMarcoFalke
fa078984c9 test: Properly log named args in authproxy (MarcoFalke) Pull request description: ACKs for commit fa0789: promag: ACK fa07898, for instance: practicalswift: utACK fa078984c9cc706dc7b510a8ada26c3026713647 Tree-SHA512: 3a2564c9b8392c2ef13657138fa0ba4a521015e2d53331156d2a07ccc9497fb268f21e8d93b065c5734d25e4aea8f5cf67f07e6ab93b0ec2987d66a136f94bb8
2019-04-10Merge #15749: Fix: importmulti only imports origin info for PKH outputsMeshCollider
b5d398772 Take non-importing keys into account for spendability warning in descriptor import (Pieter Wuille) 6e597001a Import all origin info in importmulti; even for non-importing pubkeys (Pieter Wuille) 9a93c91c8 Keep full pubkeys in FlatSigningProvider::origins (Pieter Wuille) Pull request description: This fixes #15743 and #15742. Since #15263, pubkeys are no longer imported for non-PKH (or WPKH, or any wrapped form of those) outputs, as that would incorrectly mark outputs to single-key versions of multisig policies as watched. As a side effect, this change also caused origin info not to be imported anymore for multisig policies. Fix this by plumbing through the full pubkey information for origins in FlatSigningProvider, and then importing all origin info we have in `importmulti` (knowing more never hurts, and additional origin information has no negative consequences like importing the pubkeys themselves). ACKs for commit b5d398: MeshCollider: utACK https://github.com/bitcoin/bitcoin/pull/15749/commits/b5d39877242504160a7f2c24c60c07a845d7a064 Tree-SHA512: 37caa2be8d01b8baa12f70a58eaa7c583f5f0afbe012e02936dd8790dc5dc852f880b77258b34ddb68cae30c029585f2d1c4f5d00015380557a1e8b471e500f3
2019-04-08test: Properly log named args in authproxyMarcoFalke
2019-04-08Merge #15495: Add regtests for HTTP status codesJonas Schnelli
8f5d9431a Add regtests for HTTP status codes. (Daniel Kraft) Pull request description: This adds explicit tests for the returned HTTP status codes to `interface_rpc.py` (for error cases) and the HTTP JSON-RPC client in general for success. #15381 brought up discussion about the HTTP status codes in general, and the general opinion was that the current choice may not be ideal but should not be changed to preserve compatibility with existing JSON-RPC clients. Thus it makes sense to actually test the current status to ensure this desired compatibility is not broken accidentally. ACKs for commit 8f5d94: laanwj: utACK 8f5d9431a36740aa12abc0acea64df48fe32d2a6 promag: utACK 8f5d943. jonasschnelli: utACK 8f5d9431a36740aa12abc0acea64df48fe32d2a6 Tree-SHA512: 82503ccd134dd9145304e95cb6c61755f100bee27593d567cdd5c0c554d47e7b06d937456cab04107f46f4984930355db65d5e711008a0b05f2b8feec9f2950e
2019-04-06Merge #15660: [qa] Overhaul p2p_compactblocks.pyMarcoFalke
7813eb1db1 [qa] Overhaul p2p_compactblocks.py (Suhas Daftuar) Pull request description: Remove tests of: - compactblock behavior in a simulated pre-segwit version of bitcoind This should have been removed a long time ago, as it is not generally necessary for us to test the behavior of old nodes (except perhaps if we want to test that upgrading from an old node to a new one behaves properly) - compactblock behavior during segwit upgrade (ie verifying that network behavior before and after activation was as expected) This is unnecessary to test now that segwit activation has already happened. ACKs for commit 7813eb: jnewbery: utACK 7813eb1db132c023902ad945995cc32a325893ca Tree-SHA512: cadf035e6f822fa8cff974ed0c2e88a1d4d7da559b341e574e785fd3d309cc2c98c63bc05479265dc00550ae7b77fc3cbe815caae7f68bcff13a04367dca9b52
2019-04-06Take non-importing keys into account for spendability warning in descriptor ↵Pieter Wuille
import
2019-04-02Merge #15680: Remove resendwallettransactions RPC methodMarcoFalke
ea1a2d8794 [wallet] Remove ResendWalletTransactionsBefore (John Newbery) f5162458cd [rpc] remove resendwallettransactions RPC (John Newbery) Pull request description: Remove resendwallettransactions RPC method This RPC was added for testing wallet rebroadcasts. Since we now have a real test for wallet rebroadcasts, it's no longer needed. The call in wallet_basic.py can be removed because wallet_resendwallettransactions.py tests wallet rebroadcast. ACKs for commit ea1a2d: MarcoFalke: re-utACK ea1a2d8794 promag: utACK ea1a2d8. Tree-SHA512: 48245d947be1a2d2b8c30d2946105818c454a03b70b63534ecadf2144da64dafe1c9527ea670a5f4d1acd05ccdfc6c9be43ca636ee2ba58a8b7a7b2fc7bc88fd
2019-04-01[qa] Overhaul p2p_compactblocks.pySuhas Daftuar
Remove tests of: - compactblock behavior in a simulated pre-segwit version of bitcoind This should have been removed a long time ago, as it is not generally necessary for us to test the behavior of old nodes (except perhaps if we want to test that upgrading from an old node to a new one behaves properly) - compactblock behavior during segwit upgrade (ie verifying that network behavior before and after activation was as expected) This is unnecessary to test now that segwit activation has already happened. Includes changes by John Newbery.
2019-04-01Merge #15652: wallet: Update transactions with current mempool after loadMarcoFalke
4bf1b1cefa qa: Check unconfirmed balance after loadwallet (João Barbosa) 2ebf650b2e wallet: Update transactions with current mempool after load (João Barbosa) 57908a739c interfaces: Add Chain::requestMempoolTransactions (João Barbosa) 0440481c6b wallet: Move CWallet::ReacceptWalletTransactions locks to callers (João Barbosa) Pull request description: Fixes #15591. ACKs for commit 4bf1b1: MarcoFalke: re-utACK 4bf1b1cefa jnewbery: utACK 4bf1b1cefa9723bf2cfa8b1a938757abc99bb17b Tree-SHA512: 604b1057c7f9fc3772084bf6914e52dd1a68a1cfd365f907e8ec78f6f5f726bc56a3cad9f2b665642714fbf3d51e37c1184ac396460bddeafd918e8f9f7af392
2019-03-31qa: Check unconfirmed balance after loadwalletJoão Barbosa
2019-03-29[rpc] remove resendwallettransactions RPCJohn Newbery
This RPC was added for testing wallet rebroadcasts. Since we now have a real test for wallet rebroadcasts, it's no longer needed. The call in wallet_basic.py can be removed because wallet_resendwallettransactions.py tests wallet rebroadcast.
2019-03-29[tests] make pruning test fasterJohn Newbery
This commit makes the pruning.py much faster. Key insights to do this: - pruning.py doesn't care what kind of transactions make up the big blocks that are pruned in the test. Instead of making blocks with several large, expensive to construct and validate transactions, instead make the large blocks contain a single coinbase transaction with a huge OP_RETURN txout. - avoid stop-starting nodes where possible. This test could probably be made even faster by using the P2P interface for submitting blocks instead of the submitblock RPC.
2019-03-29[tests] style fixes in feature_pruning.pyJohn Newbery
Minor style fixups. No functional change.
2019-03-27Merge #15646: [tests] Add test for wallet rebroadcastsMarcoFalke
529c1ae4a0 [tests] Add test for wallet rebroadcasts (John Newbery) Pull request description: The existing wallet_resendwallettransactions.py test only tests the resendwallettransactions RPC. It does not test whether transactions are actually rebroadcast, or whether the rebroadcast logic is called on a timer. Update the test to not use the resendwallettransactions RPC and test that transactions are resent on a timer. ACKs for commit 529c1a: MarcoFalke: re-utACK 529c1ae4a0 Tree-SHA512: 7341e7dd07cdc8ecbc08b1949121824148d2b58133a8e298ecdc5b7555713df3cecffb49854443cef9f033ef847cbf329e879a3bf57ab4e1fc733be432e9f718
2019-03-27[tests] Add test for wallet rebroadcastsJohn Newbery
The existing wallet_resendwallettransactions.py test only tests the resendwallettransactions RPC. It does not test whether transactions are actually rebroadcast, or whether the rebroadcast logic is called on a timer. This commit updates the test to not use the resendwallettransactions RPC and test that transactions are rebroadcast on a timer.
2019-03-27Merge #15519: Add Poly1305 implementationWladimir J. van der Laan
e9d5e975612e828ec44f9247b4c5c08f0268d360 Poly1305: tolerate the intentional unsigned wraparound in poly1305.cpp (Jonas Schnelli) b34bf302f26c7cede47cc20b3bdfb613c51ab67e Add Poly1305 bench (Jonas Schnelli) 03be7f48fad10aa8da3291c28a185ed750193c7b Add Poly1305 implementation (Jonas Schnelli) Pull request description: This adds a currently unused Poly1305 implementation including test vectors from RFC7539. Required for BIP151 (and related to #15512). Tree-SHA512: f8c1ad2f686b980a7498ca50c517e2348ac7b1fe550565156f6c2b20faf764978e4fa6b5b1c3777a16e7a12e2eca3fb57a59be9c788b00d4358ee80f2959edb1
2019-03-26Poly1305: tolerate the intentional unsigned wraparound in poly1305.cppJonas Schnelli
2019-03-24rpc: Rename size to vsize in mempool related callsMiguel Herranz
2019-03-23Merge #15642: [rpc] Remove deprecated rpc warningsWladimir J. van der Laan
947f73ceba7d74153fe83b538e42be1dfe77aea4 [docs] remove reference to signrawtransaction in the developer docs. (John Newbery) 7b6616b78bd9f76502002db1a209a0363979e506 [rpc] Remove deprecated functionality message from validateaddress help (John Newbery) 839c3f7c4937eb8a3e1e5ab2dafff26688af1078 [rpc] Remove signrawtransaction warning (John Newbery) Pull request description: Removes some deprecated code from the RPCs: - signrawtransaction was deprecated in 0.17 and removed in 0.18. A warning message was left in place to advise users to use signrawtransactionwithwallet and signrawtransactionwithkey. That warning can now be removed. - validateaddress had some functionality deprecated in 0.17 and removed in 0.18. The help text for that functionality was not removed in 0.18 and can be removed now. Tree-SHA512: 981678a697954ff2c392752e5a183b4b12c4eb94f55766ee1aa97a70d300668237db8fc5748c2772869d0155ba4a93e38817887b98160ee972a6f6ee94e3f7d9
2019-03-22[rpc] Remove signrawtransaction warningJohn Newbery
signrawtransaction was deprecated in 0.17 and removed in 0.18. A warning was left in place to tell users to migrate to using signrawtransactionswithwallet or signrawtransactionwithkey. Remove the warning now that it's been two releases since the method was removed.
2019-03-19qa: mininode: Clearer error message on invalid magic bytesMarcoFalke
2019-03-18Merge #13541: wallet/rpc: sendrawtransaction maxfeerateMarcoFalke
7abd2e697c wallet/rpc: add maxfeerate parameter to testmempoolaccept (Karl-Johan Alm) 6c0a6f73e3 wallet/rpc: add maxfeerate parameter to sendrawtransaction (Karl-Johan Alm) e5efacb941 test: Refactor vout fetches in rpc_rawtransaction (Karl-Johan Alm) Pull request description: This adds a new `maxfeerate` parameter to `sendrawtransaction` which forces the node to reject a transaction whose feerate is above the given fee rate. This is a safety harness from shooting yourself in the foot and accidentally overpaying fees. See also #12911. Tree-SHA512: efa50134a7c17c9330cfdfd48ba400e095c0a419cc45e630618d8b44929c25d780d1bb2710c1fbbb6e687eca373505b0338cdaa7f2ff4ca22636d84c31557a2e
2019-03-18Merge #15466: tests: Print remaining jobs in test_runner.pyMarcoFalke
2e5d482659 tests: Print remaining jobs in test_runner.py (Steven Roose) Pull request description: This helps finding out which tests fail to finish. Tree-SHA512: d22beb82beecd33aaa50731c83075e49577842d29fd21aa63bcb859df5da99069eba9cc16eed5d91dbba8fb0fdc317fb88b3b370c4d3917e9da1cd13b0a622dc
2019-03-14wallet/rpc: add maxfeerate parameter to testmempoolacceptKarl-Johan Alm
2019-03-14wallet/rpc: add maxfeerate parameter to sendrawtransactionKarl-Johan Alm
2019-03-12rpc: return a number for estimated_feerate in analyzepsbtfanquake
2019-03-11Merge #15564: cli: remove duplicate wallet fields from -getinfoMarcoFalke
3f6568d66b cli: remove duplicate wallet fields from -getinfo (fanquake) Pull request description: `walletversion` and `balance` are both included below. Tree-SHA512: cd9fe9739a2f492c8f7c0407b43a6fa95187f7e5318f05e080bac112f9f4333d2e9b84c505d098f8d66fa79439007d1c0b22e5a87d70bf5ea53ab647ee4c2046
2019-03-09cli: remove duplicate wallet fields from -getinfofanquake
2019-03-09cli: replace testnet with chain and return network name as per BIP70.fanquake
2019-03-06test: Refactor vout fetches in rpc_rawtransactionKarl-Johan Alm
2019-03-05tests: Print remaining jobs in test_runner.pySteven Roose
This helps finding out which tests fail to finish.
2019-03-05Merge #15534: [test] lint-format-strings: open files sequentially (fix for OS X)MarcoFalke
21be609b49 In lint-format-strings, open files sequentially (Glenn Willen) Pull request description: In lint-format-strings, we use python argparse to read our file arguments. In this mode, argparse opens all the files simultaneously. On OS X, where the default filehandle limit is 128, this causes the lint to fail. Instead, ask argparse for our filename arguments as strings, and open them one at a time using 'with open'. Tree-SHA512: 4c7dabf98818a7c5d83ab10c61b89a26957fe399e39e933e30c561cb45c5e8ba6f6aedcde8343da0c32ee340289a8897db6a33708e35ee381334ee27e3f4d356
2019-03-05Merge #14954: build: Require python 3.5MarcoFalke
fa2797808e test: Remove python3.4 workaround in feature_dbcrash (MarcoFalke) dddd1d05d3 .python-version: Specify full version 3.5.6 (MarcoFalke) faa7cdf764 scripted-diff: Update copyright in ./test (MarcoFalke) fa0e65b772 scripted-diff: test: Remove brackets after assert (MarcoFalke) fab5a1e0f4 build: Require python 3.5 (MarcoFalke) fa6bf21f5e scripted-diff: test: Use py3.5 bytes::hex() method (MarcoFalke) Pull request description: Python 3.4 is EOL after March 2019, so switch to 3.5. See https://devguide.python.org/#status-of-python-branches This pull does the following in a bunch of commits: * scripted diff to use the `bytes::hex()` method in place of previous wrappers (`b2x`, `bytes_to_hex_str`, `hexlify`, ...) * Update the build system (gitian and travis) to remove python2.7 and replace it with python3.5 * Another scripted-diff to remove brackets after `assert`. This is unrelated to the python3.5 switch, but a stylistic commit, so probably not worth to split up. The motivation behind it is to avoid asserting on data structures (such as tuples of length one), which never fails: ```py >>> assert(False,) # with brackets >>> assert False, # without brackets SyntaxError: invalid syntax >>> assert False # proper assertion AssertionError ``` * And then a final scripted diff to update the copyright headers in the `test` subfolder, since I touched most of the files anyway and it wouldn't make sense to split this commit out into a separate pull. For reference (contributed by luke-jr): Ubuntu LTS (bionic): 3.6.5 Debian stable (stretch): 3.5.3 RHEL 8 (expected before v0.19): 3.6.x Gentoo stable: 3.6.5 Arch: 3.7.1 Tree-SHA512: 643c28cd2d5b9543ce4bf8ad2a8b282bc79b37dc5b25c9c8358e6ce201e2a67a546463e5f3430b16652eb2489d7c3ed4b0772cd2e2bf790fe68a5e3cc8a25029
2019-03-04In lint-format-strings, open files sequentiallyGlenn Willen
In lint-format-strings, we use python argparse to read our file arguments. In this mode, argparse opens all the files simultaneously. On OS X, where the default filehandle limit is 128, this causes the lint to fail. Instead, ask argparse for our filename arguments as strings, and open them one at a time using 'with open'.
2019-03-04test: Remove python3.4 workaround in feature_dbcrashMarcoFalke
2019-03-02scripted-diff: Update copyright in ./testMarcoFalke
-BEGIN VERIFY SCRIPT- ./contrib/devtools/copyright_header.py update ./test/ -END VERIFY SCRIPT-
2019-03-02scripted-diff: test: Remove brackets after assertMarcoFalke
-BEGIN VERIFY SCRIPT- sed -i --regexp-extended -e 's/assert ?\((.+)\)(( )*)?(#.*)?$/assert \1\3\3\4/g' $(git grep -l --extended-regexp 'assert ?\(' test) -END VERIFY SCRIPT-
2019-03-02build: Require python 3.5MarcoFalke
2019-03-02scripted-diff: test: Use py3.5 bytes::hex() methodMarcoFalke
-BEGIN VERIFY SCRIPT- sed -i -e "s/def bytes_to_hex_str/def b_2_x/g" $(git grep -l bytes_to_hex_str) export RE_B_0="[^()]*" # match no bracket export RE_B_1="${RE_B_0}\(${RE_B_0}\)${RE_B_0}" # match exactly one () export RE_B_2="${RE_B_0}\(${RE_B_1}\)${RE_B_0}" # match wrapped (()) export RE_M="(b2x|bytes_to_hex_str)\(((${RE_B_0}|${RE_B_1}|${RE_B_2})*)\)" sed -i --regexp-extended -e "s/${RE_M}/\2.hex()/g" $(git grep -l -E '(b2x|bytes_to_hex_str)') sed -i --regexp-extended -e "/ +bytes_to_hex_str( as b2x)?,/d" $(git grep -l bytes_to_hex_str) sed -i --regexp-extended -e "s/ +bytes_to_hex_str( as b2x)?,//g" $(git grep -l bytes_to_hex_str) sed -i --regexp-extended -e "s/, bytes_to_hex_str( as b2x)?//g" $(git grep -l bytes_to_hex_str) export RE_M="(binascii\.)?hexlify\(((${RE_B_0}|${RE_B_1}|${RE_B_2})*)\).decode\(${RE_B_0}\)" sed -i --regexp-extended -e "s/${RE_M}/\2.hex()/g" $(git grep -l hexlify -- ':(exclude)share') sed -i --regexp-extended -e "/from binascii import hexlify$/d" $(git grep -l hexlify -- ':(exclude)share') sed -i --regexp-extended -e "s/(from binascii import) .*hexlify/\1 unhexlify/g" $(git grep -l hexlify -- ':(exclude)share') sed -i -e 's/ignore-names "/ignore-names "b_2_x,/g' ./test/lint/lint-python-dead-code.sh -END VERIFY SCRIPT-
2019-03-02Merge #15335: Fix lack of warning of unrecognized section namesMarcoFalke
1a7ba84e11 Fix lack of warning of unrecognized section names (Akio Nakamura) Pull request description: In #14708, It was introduced that to warn when unrecognized section names are exist in the config file. But ```m_config_sections.clear()``` in ```ArgsManager::ReadConfigStream()``` is called every time when reading each configuration file, so it can warn about only last reading file if ```includeconf``` exists. This PR fix lack of warning by collecting all section names by moving ```m_config_sections.clear()``` to ```ArgsManager::ReadConfigFiles()``` . Also add a test code to confirm this situation. Tree-SHA512: 26aa0cbe3e4ae2e58cbe73d4492ee5cf465fd4c3e5df2c8ca7e282b627df9e637267af1e3816386b1dc6db2398b31936925ce0e432219fec3a9b3398f01e3e65
2019-03-02Merge #15492: [rpc] remove deprecated generate methodMarcoFalke
07cae5287c [wallet] remove unused GetScriptForMining (Sjors Provoost) 8bb3e4c487 [rpc] remove deprecated generate method (Sjors Provoost) Pull request description: As announced in v0.18, the wallet generate rpc method is deprecated and will be fully removed in v0.19. Clients should transition to using the node rpc method `generatetoaddress`. Tree-SHA512: 9e5e913b59f3e18440b2b7b356124c7b87ad19f81a1ab6ada06a6c396b84e734895465f569296f1ba8c12abf74863bab5fd77765c9e806c239713aa83a59485f
2019-03-01Merge #15485: add rpc_misc.py, mv test getmemoryinfo, add test mallocinfoMarcoFalke
f13ad1cae0 modify test for memory locked in case locking pages failed at some point (Adam Jonas) 2fa85ebd1c add rpc_misc.py, mv test getmemoryinfo, add test mallocinfo (Adam Jonas) Pull request description: Creating the `rpc_misc.py` functional test file to add space for adding tests to a file that doesn't have a lot of coverage. - Removing the `getmemoryinfo()` smoke test from wallet basic rather than moving it to keep the wallet decoupled. Feel like testing for reasonable memory allocation values should suffice. - Adding coverage for `mallocinfo()`. Introduced standard lib XML parser since the function exports an XML string that describes the current state of the memory-allocation implementation in the caller. Tree-SHA512: ced30115622916c88d1e729969ee331272ec9f2881eb36dee4bb7331bf633a6810a57fed63a0cfaf86de698edb5162e6a035efd07c89ece1df56b69d61288072
2019-03-01modify test for memory locked in case locking pages failed at some pointAdam Jonas
2019-03-01Merge #15497: rpc: Consistent range arguments in ↵MarcoFalke
scantxoutset/importmulti/deriveaddresses ca253f6ebf Make deriveaddresses use stop/[start,stop] notation for ranges (Pieter Wuille) 1675b7ce55 Use stop/[start,stop] notation in importmulti desc range (Pieter Wuille) 4566011631 Add support for stop/[start,stop] ranges to scantxoutset (Pieter Wuille) 6b9f45e81b Support ranges arguments in RPC help (Pieter Wuille) 7aa6a8aefb Add ParseRange function to parse args of the form int/[int,int] (Pieter Wuille) Pull request description: This introduces a consistent notation for RPC arguments in `scantxoutset`, `importmulti`, and `deriveaddresses`, either: * `"range" : int` to just specify the end of the range * `"range" : [int,int]` to specify both the begin and the end of the range. For `scantxoutset`, this is a backward compatible new feature. For the two other RPCs, it's an incompatible change, but neither of them has been in a release so far. Because of that non-released reason, this only makes sense in 0.18, in my opinion. I suggest this as an alternative to #15496, which only makes `deriveaddresses` compatible with `importmulti`, but not with the existing `scantxoutset` RPC. I also think `[int,int]` is more convenient than `{"start":int,"stop":int}`. I realize this is technically a feature added to `scantxoutset` after the feature freeze. If desired, I'll drop the `scantxoutset` changes. Tree-SHA512: 1cbebb90cf34f106786dbcec7afbf3f43fb8b7e46cc7e6763faf1bc1babf12375a1b3c3cf86ee83c21ed2171d99b5a2f60331850bc613db25538c38b6a056676