Commit graph

944 commits

Author SHA1 Message Date
Eelis
28f8b66577 Diagnose unsuitable outputs in lockunspent().
Fixes #2667.
2017-10-12 15:56:32 +02:00
Wladimir J. van der Laan
a865b38bf3
Merge #11133: Document assumptions that are being made to avoid division by zero
55509f1 Document assumptions that are being made to avoid division by zero (practicalswift)

Pull request description:

  Document assumptions (via `assert(…)`:s) that are being made to avoid division by zero.

  Rationale:
  * Make it clear to human reviewers and non-human static analyzers that what might look like potential division by zero cases are written the way they are intentionally (these cases are currently flagged by various static analyzers).

Tree-SHA512: bbb67b1370afd8f39bda35f9e3a20f4325f017d94cc1bfac3b0d36c9f34c2d95a9efe11efe44db29fb4aadd25d8276d8f0e03c8806ac64f0d21d821912e13b8e
2017-10-12 13:40:16 +02:00
Dusty Williams
aa57590d7c Update importprivkey named args documentation
Fixes #11462. Updated documentation for importprivkey function to use the correct name for the first argument.
Also updates a call to importprivkey to use named args in functional test.
2017-10-09 07:40:42 -04:00
MarcoFalke
e93fff1463
Merge #11107: Fix races in AppInitMain and others with lock and atomic bools
c626dcb50 Make fUseCrypto atomic (MeshCollider)
731065b11 Consistent parameter names in txdb.h (MeshCollider)
35aeabec6 Make fReindex atomic to avoid race (MeshCollider)
58d91af59 Fix race for mapBlockIndex in AppInitMain (MeshCollider)

Pull request description:

  Fixes https://github.com/bitcoin/bitcoin/issues/11106

  Also makes fReindex atomic as suggested in @TheBlueMatt comment below, and makes fUseCrypto atomic as suggested in 10916

  d291e7635b just renames the parameters in the txdb header file to make them consistent with those used in the cpp file, noticed it when looking for uses of fReindex

Tree-SHA512: b378aa7289fd505b76565cd4d48dcdc04ac5540283ea1c80442170b0f13cb6df771b1a94dd54b7fec3478a7b4668c224ec9d795f16937782724c5d020edd3a42
2017-10-05 15:03:36 +02:00
Wladimir J. van der Laan
7f11ef2608
Merge #9937: rpc: Prevent dumpwallet from overwriting files
0cd9273 rpc: Prevent `dumpwallet` from overwriting files (Wladimir J. van der Laan)

Pull request description:

  Prevent arbitrary files from being overwritten by `dumpwallet`. There have been reports that users have overwritten wallet files this way. It may also avoid other security issues.

  Fixes #9934. Adds mention to release notes and adds a test.

Tree-SHA512: 268c98636d40924d793b55a685a0b419bafd834ad369edaec08227ebe26ed4470ddea73008d1c4beb10ea445db1b0bb8e3546ba8fc2d1a411ebd4a0de8ce9120
2017-10-04 15:01:24 +02:00
Wladimir J. van der Laan
a1f7f18709
Merge #10939: [init] Check non-emptiness of -blocknotify command prior to executing
cffe85f Skip sys::system(...) call in case of empty command (practicalswift)
6fb8f5f Check that -blocknotify command is non-empty before executing (practicalswift)

Pull request description:

  Check that `-blocknotify` command is non-empty before executing.

  To make the `BlockNotifyCallback(...)` (`-blocknotify`) behaviour consistent with that of:
  * `AlertNotify(...)` (`-alertnotify`)
  * `AddToWallet(...)` (`-walletnotify`)

Tree-SHA512: 18272166793a5a8b9cc2a727bfbcea53d38c329a55bc975c02db601329d608a61c20e026ce4b616193ecd3810dca4d3e2cb3bf773898a51872008a8dba96763e
2017-10-04 14:54:09 +02:00
MarcoFalke
e542728cde
Merge #11303: Fix estimatesmartfee rounding display issue
1789e4675 Force explicit double -> int conversion for CFeeRate constructor (Matt Corallo)
53a6590f4 Make float <-> int casts explicit outside of test, qt, CFeeRate (Matt Corallo)
0b1b9148c Remove countMaskInv caching in bench framework (Matt Corallo)

Pull request description:

  This fixes an issue where estimatesmartfee which matches at the min relay fee will return 999 sat/byte instead of 1000 sat/byte due to a float rounding issue. I went ahead and made all float <-> int conversion outside of test/qt explicit (test only had one or two more, Qt had quite a few, including many in the Qt headers themselves) and added overloads to CFeeRate to force callers to do an explicit round themselves. Easy to test with -Wfloat-conversion.

Tree-SHA512: 66087b08e5dfca67506da54ae057c2f9d86184415e8fa4fa0199e38839e06a3ce96c836fcb7593b7d960065f5240c594ff3a0cfa14333ac528421f5aeac835c9
2017-09-30 18:07:55 +02:00
MarcoFalke
93d20a734d
Merge #11309: Minor cleanups for AcceptToMemoryPool
bf64c3cb3 Ignore transactions added to mempool during a reorg for fee estimation purposes. (Alex Morcos)
04f78ab5b Do not reject based on mempool min fee when bypass_limits is set. (Alex Morcos)
fd849e1b0 Change AcceptToMemoryPool function signature (Alex Morcos)

Pull request description:

  First commit just removes default arguments from `AcceptToMemoryPool` and consolidates two arguments, it does not change behavior.

  Second commit finally fixes the fact that we're not meant to reject based on mempool min fee when adding a transaction from a disconnected block during a reorg as mentioned [here](https://github.com/bitcoin/bitcoin/pull/9602#issue-202197849)

  Third commit makes fee estimation ignore transactions added from a disconnected block during a reorg. I think this was another source of fee estimates returning estimates below 1000 sat/kB as in #11303.

Tree-SHA512: 30925ca8b341915bb214f1d2590b36b7931f2e125b7660150e38ae70338f00db5aa7f1608546dddb181446924177eb7cf62ea8bd2583068acc074d6c3f86bc0c
2017-09-29 15:07:57 +02:00
Wladimir J. van der Laan
aa624b61c9
Merge #11167: Full BIP173 (Bech32) support
8213838 [Qt] tolerate BIP173/bech32 addresses during input validation (Jonas Schnelli)
06eaca6 [RPC] Wallet: test importing of native witness scripts (NicolasDorier)
fd0041a Use BIP173 addresses in segwit.py test (Pieter Wuille)
e278f12 Support BIP173 in addwitnessaddress (Pieter Wuille)
c091b99 Implement BIP173 addresses and tests (Pieter Wuille)
bd355b8 Add regtest testing to base58_tests (Pieter Wuille)
6565c55 Convert base58_tests from type/payload to scriptPubKey comparison (Pieter Wuille)
8fd2267 Import Bech32 C++ reference code & tests (Pieter Wuille)
1e46ebd Implement {Encode,Decode}Destination without CBitcoinAddress (Pieter Wuille)

Pull request description:

  Builds on top of #11117.

  This adds support for:
  * Creating BIP173 addresses for testing (through `addwitnessaddress`, though by default it still produces P2SH versions)
  * Sending to BIP173 addresses (including non-v0 ones)
  * Analysing BIP173 addresses (through `validateaddress`)

  It includes a reformatted version of the [C++ Bech32 reference code](https://github.com/sipa/bech32/tree/master/ref/c%2B%2B) and an independent implementation of the address encoding/decoding logic (integrated with CTxDestination). All BIP173 test vectors are included.

  Not included (and intended for other PRs):
  * Full wallet support for SegWit (which would include automatically adding witness scripts to the wallet during automatic keypool topup, SegWit change outputs, ...) [see #11403]
  * Splitting base58.cpp and tests/base58_tests.cpp up into base58-specific code, and "address encoding"-code [see #11372]
  * Error locating in UI for BIP173 addresses.

Tree-SHA512: 238031185fd07f3ac873c586043970cc2db91bf7735c3c168cb33a3db39a7bda81d4891b649685bb17ef90dc63af0328e7705d8cd3e8dafd6c4d3c08fb230341
2017-09-29 10:18:45 +02:00
Pieter Wuille
e278f12ca7 Support BIP173 in addwitnessaddress 2017-09-28 16:24:33 -07:00
Pieter Wuille
c091b99379 Implement BIP173 addresses and tests 2017-09-28 16:24:30 -07:00
MarcoFalke
69c7ecef40
Merge #11408: Trivial: Fix parameter name typo in ErasePurpose walletdb method
603efe9fc Fix parameter name typo in ErasePurpose walletdb method. (Pierre Rochard)

Pull request description:

  The header file has the correct method signature and the one usage in CWallet::DelAddressBook is correctly passing in EncodeDestination(address)

Tree-SHA512: ee0808a74111fd23a1c47ba5ab51de151fdd33a01d92895671e562ac184cbcb33180a3ff26c22e5717595592097b9fa33deca9878d89ce8d34687f09cfadfcf0
2017-09-27 14:23:39 +02:00
Pierre Rochard
603efe9fc4 Fix parameter name typo in ErasePurpose walletdb method. 2017-09-26 18:02:09 -04:00
Wladimir J. van der Laan
dc597bb895
Merge #11225: wallet: update stored witness in AddToWallet
d01a968 wallet: update stored witness in AddToWallet (Suhas Daftuar)

Pull request description:

  Replace witness-stripped wallet transactions with full transactions;
  this can happen when upgrading from a pre-segwit wallet to a segwit-
  aware wallet.

Tree-SHA512: a348b16b38ae738fa75cf7d3ff50ebd0d0071d5d6061c9a10dc3325fc34f6bc96a67aea21fde460ca20f6178768ee0af04d6d8785b35647f436a9083c4270b07
2017-09-26 16:24:28 +02:00
Wladimir J. van der Laan
0cd9273fd9 rpc: Prevent dumpwallet from overwriting files
Prevent arbitrary files from being overwritten. There have been reports
that users have overwritten wallet files this way. It may also avoid
other security issues.

Fixes #9934. Adds mention to release notes and adds a test.
2017-09-26 16:12:47 +02:00
Pieter Wuille
6c4fecfaf7
Merge #11351: Refactor: Modernize disallowed copy constructors/assignment
2a07f878a Refactor: Modernize disallowed copy constructors/assignment (Dan Raviv)

Pull request description:

  Use C++11's better capability of expressing an interface of a non-copyable class by publicly deleting its copy ctor and assignment operator instead of just declaring them private.

Tree-SHA512: 878f446be5a136bb2a90643aaeaca62948b575e6ef71ccc5b4b8f373e66f36ced00665128f36504e0ccfee639863d969329c4276154ef9f2a9de9137f0801e01
2017-09-21 22:43:32 -07:00
Wladimir J. van der Laan
551d7bf604
Merge #11132: Document assumptions that are being made to avoid NULL pointer dereferences
fdc3293 Document assumptions that are being made to avoid NULL pointer dereferences (practicalswift)

Pull request description:

  Document assumptions (via `assert(…)`:s) that are being made avoid `NULL` pointer dereferences.

  Rationale:
  * Make it clear to human reviewers and non-human static analyzers that what might look like potential `NULL` pointer dereferences are written the way they are intentionally (these cases are currently flagged by various static analyzers).

Tree-SHA512: b424328195e2680e1e4ec546298f718c49e5ad182147dc004de580693db1b50eec4065e1c4f232bdb302baa12954265a50ba21cb5ba4ff30248535b2de778672
2017-09-20 19:07:40 +02:00
Dan Raviv
2a07f878a8 Refactor: Modernize disallowed copy constructors/assignment
Use C++11's better capability of expressing an interface of a non-copyable class by publicly deleting its copy ctor and assignment operator instead of just declaring them private.
2017-09-16 13:06:05 +03:00
Alex Morcos
fd849e1b03 Change AcceptToMemoryPool function signature
Combine fLimitFree and fOverrideMempoolLimit into a single boolean:
bypass_limits.  This is used to indicate that mempool limiting based on feerate
should be bypassed.  It is used when readding transactions from a reorg and then
the mempool is trimmed to size after all transactions are added and they can be
evaluated in the context of their descendants. No changes to behavior.
2017-09-12 12:30:26 -04:00
MarcoFalke
fadf31ef02 wallet: Display non-HD error on first run 2017-09-12 12:40:41 +02:00
Matt Corallo
53a6590f49 Make float <-> int casts explicit outside of test, qt, CFeeRate 2017-09-11 15:51:37 -04:00
MeshCollider
c626dcb50e Make fUseCrypto atomic 2017-09-10 11:29:08 +12:00
Wladimir J. van der Laan
c22a53cd63
Merge #11250: Bump wallet version to 159900 and remove the usehd option
713a92073 Remove usehd option and warn when it is used (Andrew Chow)
d4c18f733 Bump wallet version number to 159900 (Andrew Chow)

Pull request description:

  Bump the wallet version number to 159900 so that new wallets made without a default key will no longer work on previous versions at all. Also remove the `usehd` option to avoid weird interaction with wallet version numbers and HD-ness of wallets.

Tree-SHA512: dd7965505bfad6a926c79afd423236f509229a398a8398076f8d57d90a5974243f9459a61225c4daee560c796f427445c9e55a3ad528a3a97a9123ca6a1269ab
2017-09-08 02:28:12 +02:00
Andrew Chow
713a92073b Remove usehd option and warn when it is used
Removed the -usehd option so wallets cannot be made to be non-hd
anymore. A warning will be displayed when the option is set.
2017-09-07 16:37:44 -07:00
Andrew Chow
d4c18f7330 Bump wallet version number to 159900 2017-09-07 16:37:07 -07:00
MarcoFalke
791a0e6dda
Merge #10767: [wallet] Clarify wallet initialization / destruction interface
5d2a3995e [trivial] fixup comment for VerifyWallets() (John Newbery)
43b0e81d0 [wallet] Add StartWallets() function to wallet/init.cpp (John Newbery)
290f3c56d [wallet] Add RegisterWalletRPC() function to wallet/init.cpp (John Newbery)
062d63102 [wallet] Add CloseWallets() function to wallet/init.cpp (John Newbery)
77fe07c15 [wallet] Add StopWallets() function to wallet/init.cpp (John Newbery)
2da5eafa4 [wallet] Add FlushWallets() function to wallet/init.cpp (John Newbery)
1b9cee66e [wallet] Rename WalletVerify() to VerifyWallets() (John Newbery)
9c76ba18c [wallet] Rename InitLoadWallet() to OpenWallets() (John Newbery)

Pull request description:

  Apologies for the mostly code move only PR. This is a pre-req for both #10740 and #10762

  All wallet component initialization/destruction functions are now in their own `wallet/init.cpp` translation unit and are no longer static functions on the CWallet class. The bitcoin_server also no longer has any knowledge that there are multiple wallets in vpwallet.

  There should be no changes in behavior from this PR.

Tree-SHA512: 7c260eb094f2fa1a88d803769ba60935810968a7309f731135e4b17623b97f18c03bbcd293c942093d1efce62c6c978f9ff484d54dc9a60bc2fcb5af2d160fcd
2017-09-07 16:35:52 -07:00
John Newbery
5d2a3995e7 [trivial] fixup comment for VerifyWallets() 2017-09-07 16:22:11 -07:00
John Newbery
43b0e81d0f [wallet] Add StartWallets() function to wallet/init.cpp 2017-09-07 16:21:26 -07:00
John Newbery
290f3c56d9 [wallet] Add RegisterWalletRPC() function to wallet/init.cpp 2017-09-07 16:21:26 -07:00
John Newbery
062d63102e [wallet] Add CloseWallets() function to wallet/init.cpp 2017-09-07 16:21:26 -07:00
John Newbery
77fe07c159 [wallet] Add StopWallets() function to wallet/init.cpp 2017-09-07 16:21:26 -07:00
John Newbery
2da5eafa47 [wallet] Add FlushWallets() function to wallet/init.cpp 2017-09-07 16:21:26 -07:00
John Newbery
1b9cee66e1 [wallet] Rename WalletVerify() to VerifyWallets()
This function can now verify multiple wallets.
2017-09-07 16:21:09 -07:00
John Newbery
9c76ba18cd [wallet] Rename InitLoadWallet() to OpenWallets()
Rationale:
- this init function can now open multiple wallets (hence
  Wallet->Wallets)
- This is named as the antonym to CloseWallets(), which carries out the
  opposite action.
2017-09-07 16:19:17 -07:00
Wladimir J. van der Laan
efb4383ef6
Merge #10793: Changing &var[0] to var.data()
592404f03 Changing &vec[0] to vec.data(), what 9804 missed (MeshCollider)

Pull request description:

  This just continues the work of https://github.com/bitcoin/bitcoin/pull/9804

  Modifies a lot of `&vector[]`'s to `vector.data()`'s across all the files including tests, just the stuff that 9804 missed

Tree-SHA512: dd1a9dffb999dea4fba78dcc91fe02f90250db86f5c74948e1ff3e8b4036b2154b600555eaa04dece5368920aae3513bc36425dc96e4319ca1041b0928a6b656
2017-09-08 01:16:54 +02:00
MeshCollider
592404f03f Changing &vec[0] to vec.data(), what 9804 missed 2017-09-08 10:36:26 +12:00
Wladimir J. van der Laan
e6ab88a452
Merge #10916: add missing lock to crypter GetKeys()
fe09b0197 add missing lock to crypter GetKeys() (Marko Bencun)
5cb3da04b keystore GetKeys(): return result instead of writing to reference (Marko Bencun)

Pull request description:

  Issue: #10905

  First commit makes GetKeys() return the result instead of writing to a reference to remove some useless lines.

Tree-SHA512: bb51255b5a6cf5488c3d5dee89f539d41f0717f018441d120047f877e0a705a133fb3b7a97d1cf8f73b5d2ed93dd2dbdfcd6f394e40105af2a12e01d397cb402
2017-09-07 22:04:18 +02:00
Matt Corallo
aece8a4637 (finally) remove getinfo in favor of more module-specific infos 2017-09-06 16:10:04 -07:00
Wladimir J. van der Laan
961901f77e
Merge #11117: Prepare for non-Base58 addresses
864cd2787 Move CBitcoinAddress to base58.cpp (Pieter Wuille)
5c8ff0d44 Introduce wrappers around CBitcoinAddress (Pieter Wuille)

Pull request description:

  This patch removes the need for the intermediary Base58 type `CBitcoinAddress`, by providing {`Encode`,`Decode`,`IsValid`}`Destination` functions that directly operate on the conversion between `std::string`s and `CTxDestination`.

  As a side, it also fixes a number of indentation issues, and removes probably several unnecessary implicit `CTxDestination`<->`CBitcoinAddress` conversions.

  This change is far from complete. In follow-ups I'd like to:
  * Split off the specific address and key encoding logic from base58.h, and move it to a address.h or so.
  * Replace `CTxDestination` with a non-`boost::variant` version (which can be more efficient as `boost::variant` allocates everything on the heap, and remove the need for `boost::get<...>` and `IsValidDestination` calls everywhere).
  * Do the same for `CBitcoinSecret`, `CBitcoinExtKey`, and `CBitcoinExtPubKey`.

  However, I've tried to keep this patch to be minimally invasive, but still enough to support non-Base58 addresses. Perhaps a smaller patch is possible to hack Bech32 support into `CBitcoinAddress`, but I would consider that a move in the wrong direction.

Tree-SHA512: c2c77ffb57caeadf2429b1c2562ce60e8c7be8aa9f8e51b591f354b6b441162625b2efe14c023a1ae485cf2ed417263afa35c892891dfaa7844e7fbabccab85e
2017-09-06 22:31:02 +02:00
Pieter Wuille
5c8ff0d448 Introduce wrappers around CBitcoinAddress
This patch removes the need for the intermediary Base58 type
CBitcoinAddress, by providing {Encode,Decode,IsValid}Destination
function that directly operate on the conversion between strings
and CTxDestination.
2017-09-06 13:07:45 -07:00
Wladimir J. van der Laan
39ae41389a
Merge #10845: Remove unreachable code
41bf1598f Remove unreachable code (practicalswift)

Pull request description:

  Remove unreachable code.

Tree-SHA512: 2ae94035f693b1ac73b1587eafcc646602a185f6d2b8a24a05939b43235b331c9e6f369ad2e8208624a47c920e989413c6a89ab9b608add5b7be4ebefae2a796
2017-09-06 21:44:18 +02:00
practicalswift
fdc329376c Document assumptions that are being made to avoid NULL pointer dereferences 2017-09-06 10:45:37 +02:00
MarcoFalke
4eb1f39d42
Merge #11173: RPC: Fix currency unit string in the help text
47ba2c312 Fix currency/fee-rate unit string in the help text (Akio Nakamura)

Pull request description:

  1. The RPC help text should use the constant `CURRENCY_UNIT` defined in `policy/feerate.cpp` instead of the literal `'BTC'`.
    In the following 2 RPC commands, `'BTC'` is written directly in the help text.
    This commit changes them to use that constant.
       1) `estimatesmartfee`
       2) `estimaterawfee`

  2. Some RPC command use `'satoshis'` as the unit.
    It should be written as `'satoshis'` instead of `'Satoshis'` in the RPC help text.
    So, this commit fixes this typo in `getblocktemplate`.

Tree-SHA512: d0bd1cd90560e59bf456b076b958a2a1c998f85a7e65aeb6b2abcaba18919a3ae62f7c3909210461084c1a3275a35b6ba3ea3ec8f5cce33702ffe383c9e84bce
2017-09-05 14:46:05 -07:00
Akio Nakamura
47ba2c312a Fix currency/fee-rate unit string in the help text
1. The RPC help text should use the constant CURRENCY_UNIT defined in
  policy/feerate.cpp instead of the literal 'BTC'. In the following
  2 RPC commands, 'BTC' is written directly in the help text.
    1) estimatesmartfee
    2) estimaterawfee
  And also, for these help strings, the notation
  'fee-per-kilobyte (in BTC)' is somewhat ambiguous.

  To write more precisely, this commit changes to 'fee rate in BTC/kB'
  with using the constant CURRENCY_UNIT.

2. Some RPC command use 'satoshis' as the unit. It should be written
  as 'satoshis' instead of 'Satoshis' in the RPC help text.

  So, this commit fixes this typo in getblocktemplate.

3. The phrase that '... feerate (BTC per KB) ...'  is used to explain
  the fee rate in the help text of following 2 RPC commands.
    1) getmempoolinfo
    2) fundrawtransaction
  But they are different from other similar help text of the RPCs.
  And also, 'KB' implies Kibibyte (2^10 byte).

  To unify and to clarify, this commit changes these phrase to
  '... fee rate in BTC/kB ...'.
  (BTC references the constant 'CURRENCY_UNIT')
2017-09-05 10:07:55 +09:00
Suhas Daftuar
d01a9682b1 wallet: update stored witness in AddToWallet
Replace witness-stripped wallet transactions with full transactions;
this can happen when upgrading from a pre-segwit wallet to a segwit-
aware wallet.
2017-09-03 08:57:17 -04:00
Andrew Chow
ec6902d0ea rpc: Push down safe mode checks
This contains most of the changes of 10563 "remove safe mode", but doesn't
remove the safe mode yet, but put an `ObserveSafeMode()` check in
individual calls with okSafeMode=false.

This cleans up the ugly "okSafeMode" flag from the dispatch tables,
which is not a concern for the RPC server.

Extra-author: Wladimir J. van der Laan <laanwj@gmail.com>
2017-08-29 10:09:41 +02:00
Wladimir J. van der Laan
df91e11ae1
Merge #11126: Acquire cs_main lock before cs_wallet during wallet initialization
de9a1db Acquire cs_main lock before cs_wallet during wallet initialization (Russell Yanofsky)

Pull request description:

  `CWallet::MarkConflicted` may acquire the `cs_main` lock after `CWalletDB::LoadWallet` acquires the `cs_wallet` lock during wallet initialization. (`CWalletDB::LoadWallet` calls `ReadKeyValue` which calls `CWallet::LoadToWallet` which calls `CWallet::MarkConflicted`). This is the opposite order that `cs_main` and `cs_wallet` locks are acquired in the rest of the code, and so leads to `POTENTIAL DEADLOCK DETECTED` errors if bitcoin is built with `-DDEBUG_LOCKORDER`.

  This commit changes `CWallet::LoadWallet` (which calls `CWalletDB::LoadWallet`) to acquire both locks in the standard order.

  Error was reported by @luke-jr in https://botbot.me/freenode/bitcoin-core-dev/msg/90244330/

Tree-SHA512: 353fe21bc0a4a2828b41876897001a3c414d4b115ee7430925bd391d8bc396fca81661145d00996c1ba1a01516d9acf8b89fb5c3da27092f5f3aa7e37ef26ffa
2017-08-28 10:56:41 +02:00
Wladimir J. van der Laan
9c833f471c
Merge #11145: Fix rounding bug in calculation of minimum change
6af49dd Output a bit more information for fee calculation report. (Alex Morcos)
a54c7b9 Fix rounding errors in calculation of minimum change size (Alex Morcos)

Pull request description:

  Thanks to @juscamarena for reporting this.

  Please backport to 0.15.

  There was a potential rounding error where the fee for the change added to the fee for the original tx could be less than the fee for the tx including change.

  This is fixed in the first commit.  The second commit adds one more snippet of information in the fee calculation report.  I actually realized that there is more information that would be nice to report, but we can add that post 0.15.

  An open question is whether we should be returning failure if the test in line 2885 is hit or just resetting pick_new_inputs and continuing.  Originally I made it a failure to avoid any possible infinite loops.  But the case hit here is an example of where that logic possibly backfired.

Tree-SHA512: efe049781acc1f6a8ad429a689359ac6f7b7c44cdfc9578a866dff4a2f6596e8de474a89d25c704f31ef4f8c89af770e98b75ef06c25419d5a6dfc87247bf274
2017-08-28 10:06:00 +02:00
practicalswift
55509f1a11 Document assumptions that are being made to avoid division by zero 2017-08-28 09:20:50 +02:00
Alex Morcos
6af49dddea Output a bit more information for fee calculation report. 2017-08-25 14:59:36 -05:00