Commit graph

457 commits

Author SHA1 Message Date
Hennadii Stepanov
0c12f0116c
wallet: Postpone NotifyWalletLoaded() for encrypted wallets
Too early NotifyWalletLoaded() call in CWallet::Create() results the
notification goes before DescriptorScriptPubKeyMans were created and
added to an encrypted wallet.

Co-authored-by: Andrew Chow <achow101-github@achow101.com>
2022-03-30 21:28:53 +02:00
fanquake
21db4eb3ff
test: fix incorrect named args in wallet tests 2022-03-25 21:27:57 +00:00
fanquake
8b0e776718
test: fix incorrect named args in coin_selection tests 2022-03-25 21:27:40 +00:00
glozow
1e52e6bd0a refactor coin selection for parameterizable change target
no behavior changes, since the target is always MIN_CHANGE
2022-03-25 11:56:46 +00:00
fanquake
3740cdd125
Merge bitcoin/bitcoin#24091: wallet: Consolidate CInputCoin and COutput
049003fe68 coinselection: Remove COutput operators == and != (Andrew Chow)
f6c39c6adb coinselection: Remove CInputCoin (Andrew Chow)
70f31f1a81 coinselection: Use COutput instead of CInputCoin (Andrew Chow)
14fbb57b79 coinselection: Add effective value and fees to COutput (Andrew Chow)
f0821230b8 moveonly: move COutput to coinselection.h (Andrew Chow)
42e974e15c wallet: Remove CWallet and CWalletTx from COutput's constructor (Andrew Chow)
14d04d5ad1 wallet: Replace CWalletTx in COutput with COutPoint and CTxOut (Andrew Chow)
0ba4d1916e wallet: Provide input bytes to COutput (Andrew Chow)
d51f27d3bb wallet: Store whether a COutput is from the wallet (Andrew Chow)
b799814bbd wallet: Store tx time in COutput (Andrew Chow)
46022953ee wallet: Remove use_max_sig default value (Andrew Chow)
10379f007f scripted-diff: Rename COutput member variables (Andrew Chow)
c7c64db41e wallet: cleanup COutput constructor (Andrew Chow)

Pull request description:

  While working on coin selection code, it occurred to me that `CInputCoin` is really a subset of `COutput` and the conversion of a `COutput` to a `CInputCoin` does not appear to be all that useful. So this PR adds fields that are present in `CInputCoin` to `COutput` and replaces the usage of `CInputCoin` with `COutput`.

  `COutput` is also moved to coinselection.h. As part of this move, the usage of `CWalletTx` is removed from `COutput`. It is instead replaced by storing a `COutPoint` and the `CTxOut` rather than the entire `CWalletTx` as coin selection does not really need the full `CWalletTx`. The `CWalletTx` was only used for figuring out whether the transaction containing the output was from the current wallet, and for the transaction's time. These are now parameters to `COutput`'s constructor.

ACKs for top commit:
  ryanofsky:
    Code review ACK 049003fe68, just adding comments and removing == operators since last review
  w0xlt:
    reACK 049003f
  Xekyo:
    reACK 049003fe68

Tree-SHA512: 048b4cd620a0415e1d9fe8597257ee4bc64656566e1d28a9bdd147d6d72dc87c3f34a3339fa9ab6acf42c388df7901fc4ee900ccaabc3de790ffad162b544c15
2022-03-24 20:46:43 +00:00
MarcoFalke
98e9d8e8e2
Merge bitcoin/bitcoin#23732: refactor: Remove gArgs from bdb.h and sqlite.h
39b1763730 Replace use of `ArgsManager` with `DatabaseOptions` (Kiminuo)

Pull request description:

  Contributes to #21005.

  The goal of this PR is to remove `gArgs` from database classes (i.e. `bdb.h` and `sqlite.h`) so that they can be tested without relying on `gArgs` in tests.

  Notes:

  * My goal is to enable unit-testing without relying on `gArgs` as much as possible. Global variables are hard to reason about which in turn makes it slightly harder to contribute to this codebase. When the compiler does the heavy lifting for us and allows us only to construct an object (or call a method) with valid parameters, we may also save some time in code reviews. The cost for this is passing an argument which is not for free but the cost is very miniscule compared to benefits, I think.
      * GUI code is an exception because it seems fine to have `gArgs` there so I don't plan to make changes in `src/qt` folder, for example.
  * My approach to removal of `gArgs` uses is moving from lower levels to upper ones and pass `ArgsManager` as an argument as needed. The approach is very similar to what #20158.

ACKs for top commit:
  achow101:
    ACK 39b1763730
  ryanofsky:
    Code review ACK 39b1763730. Just the two small ReadDatabaseArgs and Berkeley open changes that were discussed since the last review

Tree-SHA512: aa066b314db593e46c18698fe8cdd500f558b405dc04e4a9a3ff57b52b5b3a81a6cb090e0e661785d1d02c1bf18958c1f4cd715ff233aab63381e3f80960622d
2022-03-24 07:40:42 +01:00
Andrew Chow
049003fe68 coinselection: Remove COutput operators == and !=
These operators are used only by the tests in std::mismatch. As
std::mismatch can take a binary predicate, we can use a lambda that
achieves the same instead.
2022-03-23 15:01:39 -04:00
Andrew Chow
70f31f1a81 coinselection: Use COutput instead of CInputCoin
Also rename setPresetCoins to preset_coins
2022-03-23 15:01:39 -04:00
Andrew Chow
42e974e15c wallet: Remove CWallet and CWalletTx from COutput's constructor 2022-03-23 14:32:07 -04:00
Andrew Chow
14d04d5ad1 wallet: Replace CWalletTx in COutput with COutPoint and CTxOut
Instead of having a pointer to the CWalletTx in COutput, we can just
store the COutPoint and the CTxOut as those are the only things we need
from the CWalletTx. Other things CWalletTx used to provide were time and
fIsFromMe but these are also being stored by COutput.
2022-03-23 14:32:07 -04:00
Andrew Chow
0ba4d1916e wallet: Provide input bytes to COutput 2022-03-23 14:32:05 -04:00
Andrew Chow
3ab96f2945
Merge bitcoin/bitcoin#24560: wallet: Use single FastRandomContext when creating a wallet tx
fa7deaa046 wallet: Pass FastRandomContext& to coin selection (MarcoFalke)
77773b061c wallet: Pass FastRandomContext& to DiscourageFeeSniping (MarcoFalke)

Pull request description:

  Passing around a single randomness context shouldn't come with any downsides, but documents better where randomness is used and allows the unit test to be deterministic, if they wish to be so.

ACKs for top commit:
  achow101:
    ACK fa7deaa046
  promag:
    Code review ACK fa7deaa046.
  glozow:
    light code review ACK fa7deaa046

Tree-SHA512: c16287708cc82ce58311710595d0127af42fb156c93fbcaa5bde634ce323d325f4d8c99a74af24423ab22b5ad58163dd771e8b1a0e7d6bff39c9fb2a1cb21bc7
2022-03-23 13:50:57 -04:00
Andrew Chow
d51f27d3bb wallet: Store whether a COutput is from the wallet
Instead of determining whether the containing transaction is from the
wallet dynamically as needed, just pass it in to COutput and store it.
The transaction ownership isn't going to change.
2022-03-17 11:04:22 -04:00
Andrew Chow
b799814bbd wallet: Store tx time in COutput 2022-03-17 11:00:45 -04:00
Andrew Chow
46022953ee wallet: Remove use_max_sig default value
As we change the constructor for COutput, it becomes somewhat dangerous
if there are default values.
2022-03-17 10:57:08 -04:00
Andrew Chow
10379f007f scripted-diff: Rename COutput member variables
Update the member variables to match the new style

-BEGIN VERIFY SCRIPT-
sed -i 's/fSpendableIn/spendable/' $(git grep -l "fSpendableIn")
sed -i 's/fSpendable/spendable/' $(git grep -l "fSpendable")
sed -i 's/fSolvableIn/solvable/' $(git grep -l "fSolvableIn")
sed -i 's/fSolvable/solvable/' $(git grep -l "fSolvable")
sed -i 's/fSafeIn/safe/' $(git grep -l "fSafeIn")
sed -i 's/fSafe/safe/' $(git grep -l "fSafe")
sed -i 's/nInputBytes/input_bytes/' $(git grep -l "nInputBytes")
sed -i 's/nDepthIn/depth/' $(git grep -l "nDepthIn" src/wallet src/bench)
sed -i 's/nDepth/depth/' src/wallet/spend.h
sed -i 's/\.nDepth/.depth/' $(git grep -l "\.nDepth" src/wallet/)
sed -i 's/nDepth, FormatMoney/depth, FormatMoney/' src/wallet/spend.cpp
-END VERIFY SCRIPT-
2022-03-17 10:53:30 -04:00
Michael Folkson
9a5b4d7892 doc: Delete old line of code that was commented out 2022-03-16 19:33:52 +00:00
Kiminuo
39b1763730 Replace use of ArgsManager with DatabaseOptions
Co-authored-by: Russell Yanofsky <russ@yanofsky.org>
2022-03-16 08:26:28 +01:00
MarcoFalke
fa7deaa046
wallet: Pass FastRandomContext& to coin selection 2022-03-14 15:17:04 +01:00
Carl Dong
bec86ae326 blockstorage: Make m_block_index own CBlockIndex's
Instead of having CBlockIndex's live on the heap, which requires manual
memory management, have them be owned by m_block_index. This means that
they will live and die with BlockManager.

A change to BlockManager::LookupBlockIndex:
- Previously, it was a const member function returning a non-const CBlockIndex*
- Now, there's are const and non-const versions of
  BlockManager::LookupBlockIndex returning a CBlockIndex with the same
  const-ness as the member function:
    (e.g. const CBlockIndex* LookupBlockIndex(...) const)

See next commit for some weirdness that this eliminates.

The range based for-loops are modernize (using auto + destructuring) in
a future commit.
2022-02-22 11:52:19 -05:00
Taeik Lim
ba4906f951 doc: Fix typos 2022-02-17 03:42:08 +09:00
Hennadii Stepanov
ecd094e2b1
Use ArgsManager::GetPathArg() for "-walletdir" option 2022-02-09 19:31:23 +02:00
Ryan Ofsky
d216bc8d76 Re-enable walletinit_verify_walletdir_no_trailing2 test disabled in #20744
This should also fix an init error if a -walletdir with a trailing slash
is used on windows. This appears to be a real error and regression
introduced with #20744.

On windows (or at least wine), fs calls that actuallly access the
filesystem like fs::equivalent or fs::exists seem to treat directory
paths with trailing slashes as not existing, so it's necessary to
normalize these paths before using them. This change passes canonical
paths to fs calls validating the -walletdir path to fix this.
2022-02-04 09:10:19 -05:00
Kiminuo
41d7166c8a
refactor: replace boost::filesystem with std::filesystem
Warning: Replacing fs::system_complete calls with fs::absolute calls
in this commit may cause minor changes in behaviour because fs::absolute
no longer strips trailing slashes; however these changes are believed to
be safe.

Co-authored-by: Russell Yanofsky <russ@yanofsky.org>
Co-authored-by: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
2022-02-03 18:35:52 +08:00
Andrew Chow
02e1d8d06f
Merge bitcoin/bitcoin#24083: Revert "Add to spends only transcations from me"
3ee6d0788e test: add more wallet conflicts assertions (S3RK)
3b98bf9c43 Revert "Add to spends only transcations from me" (S3RK)

Pull request description:

  This reverts commit d04566415e from #22929.

  This commit was based on invalid assumption that `mapTxSpends` should contain only outgoing txs and broke wallet conflicts feature.

ACKs for top commit:
  achow101:
    ACK 3ee6d0788e

Tree-SHA512: bf5a77ced6bac57d5eb85771d9189c53e1edc295d179ed5a1bdce18e365794a9101b4cecf35387b27f67260db3b47f7214e7876e490494529b748cceeb95632d
2022-02-01 14:46:11 -05:00
Jon Atack
6fd4341c10
Require CBlockIndex::GetBlockPos() to hold mutex cs_main 2022-01-25 20:43:12 +01:00
Andrew Chow
808068e90e wallet: Allow user specified input size to override
If the user specifies an input size, allow it to override any input size
calculations during coin selection.
2022-01-24 11:23:31 -05:00
S3RK
3b98bf9c43 Revert "Add to spends only transcations from me"
This reverts commit d04566415e.
2022-01-17 08:54:08 +01:00
Russell Yanofsky
f7086fd8ff Add src/wallet/* code to wallet:: namespace 2022-01-06 22:14:16 -05:00
Russell Yanofsky
90fc8b089d Add src/node/* code to node:: namespace 2022-01-06 22:14:16 -05:00
MarcoFalke
fa88cfd3f9
Move functions to BlockManager
Needed for a later commit
2022-01-05 15:07:28 +01:00
Hennadii Stepanov
f47dda2c58
scripted-diff: Bump copyright headers
-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./
-END VERIFY SCRIPT-

Commits of previous years:
* 2020: fa0074e2d8
* 2019: aaaaad6ac9
2021-12-30 19:36:57 +02:00
Russell Yanofsky
ff5f6dea53 scripted-diff: Rename interfaces::WalletClient to interfaces::WalletLoader
Name has been confusing since it was introduced, and it was pointed in
recent review club as https://bitcoincore.reviews/10102 that it was
particularly unclear how interfaces::WalletClient was different from
interfaces::Wallet.

-BEGIN VERIFY SCRIPT-
ren() { git grep -l "$1" src | xargs sed -i "s/$1/$2/g"; }
ren WalletClient WalletLoader
ren walletClient walletLoader
ren wallet_client wallet_loader
ren "wallet clients release the wallet" "wallet pointer owners release the wallet"
ren "wallet client" "wallet loader"
ren "Wallet client" "Wallet loader"
-END VERIFY SCRIPT-
2021-12-22 13:44:55 -05:00
W. J. van der Laan
c840ab0231
Merge bitcoin/bitcoin#22019: wallet: Introduce SelectionResult for encapsulating a coin selection solution
05300c1439 Use SelectionResult in SelectCoins (Andrew Chow)
9d9b101d20 Use SelectionResult in AttemptSelection (Andrew Chow)
bb50850a44 Use SelectionResult for waste calculation (Andrew Chow)
e8f7ae5eb3 Make an OutputGroup for preset inputs (Andrew Chow)
51a9c00b4d Return SelectionResult from SelectCoinsSRD (Andrew Chow)
0ef6184575 Return SelectionResult from KnapsackSolver (Andrew Chow)
60d2ca72e3 Return SelectionResult from SelectCoinsBnB (Andrew Chow)
a339add471 Make member variables of SelectionResult private (Andrew Chow)
cbf0b9f4ff scripted-diff: Use SelectionResult in coin selector tests (Andrew Chow)
9d1d86da04 Introduce SelectionResult struct (Andrew Chow)
94d851d28c Fix bnb_search_test to use set equivalence for (Andrew Chow)

Pull request description:

  Instead of returning a set of selected coins and their total value as separate items, encapsulate both of these, and other variables, into a new `SelectionResult` struct. This allows us to have all of the things relevant to a coin selection solution be in a single object. `SelectionResult` enables us to implement the waste calculation in a cleaner way.

  All of the coin selection functions (`SelectCoinsBnB`, `KnapsackSolver`, `AttemptSelection`, and `SelectCoins`) are changed to use a `SelectionResult` as the output parameter.

  Based on #22009

ACKs for top commit:
  laanwj:
    Code review ACK 05300c1439

Tree-SHA512: e4dbb4d78a6cda9c237d230b19e7265591efac5a101a64e6970f0654e2c4f93d13bb5d07b98e8c7b8d37321753dbfc94c28c3a7810cb1c59b5bc29b08a8493ef
2021-12-09 17:21:46 +01:00
Pieter Wuille
31ba1af74a Remove unused (and broken) functionality in SpanReader
This removes the ability to set an offset in the SpanReader constructor,
as the current code is broken. All call sites use pos=0, so it is actually
unused. If future call sites need it, SpanReader{a, b, c, d} is equivalent
to SpanReader{a, b, c.subspan(d)}.

It also removes the ability to deserialize from SpanReader directly from
the constructor. This too is unused, and can be more idiomatically
simulated using (SpanReader{a, b, c} >> x >> y >> z) instead of
SpanReader{a, b, c, x, y, z}.
2021-12-06 16:18:14 -05:00
Andrew Chow
05300c1439 Use SelectionResult in SelectCoins
Replace setCoinsRet and nValueRet with SelectionResult
2021-12-05 13:44:10 -05:00
Andrew Chow
0ef6184575 Return SelectionResult from KnapsackSolver
Returns a std::optional<SelectionResult> from KnapsackSolver instead of
using out parameters for the inputs set and selected value.
2021-12-05 13:40:42 -05:00
Andrew Chow
60d2ca72e3 Return SelectionResult from SelectCoinsBnB
Removes coins_out and value_ret has SelectCoinsBnB return a
std::optional<SelectionResult>
2021-12-05 13:39:51 -05:00
Andrew Chow
a339add471 Make member variables of SelectionResult private 2021-12-05 13:39:51 -05:00
Andrew Chow
cbf0b9f4ff scripted-diff: Use SelectionResult in coin selector tests
Replace the CoinSet actual_selection with a SelectionResult
expected_result. We don't use the SelectionResult functions yet, but
will soon.

-BEGIN VERIFY SCRIPT-
sed -i 's/CoinSet actual_selection/SelectionResult expected_result(CAmount(0))/' src/wallet/test/coinselector_tests.cpp
sed -i 's/actual_selection/expected_result.m_selected_inputs/' src/wallet/test/coinselector_tests.cpp
sed -i 's/expected_result.m_selected_inputs.clear/expected_result.Clear/' src/wallet/test/coinselector_tests.cpp
-END VERIFY SCRIPT-
2021-12-05 13:39:51 -05:00
MarcoFalke
fd1c9e26d3
Merge bitcoin/bitcoin#23653: Generalize/simplify VectorReader into SpanReader
2c35a93b3c Generalize/simplify VectorReader into SpanReader (Pieter Wuille)

Pull request description:

  Originally written for #21590 (safegcd-based MuHash inverses), but then found a better way that removed the need for it, so I'm submitting it independently.

ACKs for top commit:
  MarcoFalke:
    re-ACK 2c35a93b3c 🖨
  shaavan:
    ACK 2c35a93b3c

Tree-SHA512: 959e3251e0cfe20e13a50639b617c9dc2a561d613a0884d983c93d15dacb6d2305d760aa933d18ba055cef8a1651a344bcb6b3f93051ecf26d3f2efc5779efa4
2021-12-03 10:25:24 +01:00
Pieter Wuille
2c35a93b3c Generalize/simplify VectorReader into SpanReader 2021-12-02 14:47:17 -05:00
W. J. van der Laan
bce58bbb3d
Merge bitcoin/bitcoin#22929: wallet: Automatically add receiving destinations to the address book
3d71d16d1e test: listtranscations with externally generated addresses (S3RK)
d04566415e Add to spends only transcations from me (S3RK)
9f3a622b1c Automatically add labels to detected receiving addresses (S3RK)
c1b99c088c Return used destinations from ScriptPubKeyMan::MarkUnusedAddresses (S3RK)
03840c2064 Add CWallet::IsInternalScriptPubKeyMan (S3RK)
456e350926 wallet: resolve ambiguity of two ScriptPubKey managers providing same script (S3RK)

Pull request description:

  This PR fixes certain use-cases when **send-to-self** transactions are missing from `listtransactions` output.

  1. When a receiving address is generated externally to the wallet
  (e.g. same wallet running on two nodes, or by 3rd party from xpub)
  2. When restoring backup with lost metadata, but keypool gap is not exceeded yet

  When the block is connected or tx added to mempool we already mark used keys. This PR extends this logic to determine whether the destination is a receiving one and if yes add it to the address book with empty label.

  Works both for legacy and descriptors wallets.
  - For legacy it uses the internal flag from the keypool entry. Caveat: because we don't know which script type would be used we add all possible destinations for such keys.
  - For descriptor wallets it uses internal flag for the script pub key manager. Caveat: it only works for active descriptors.

  fixes #19856
  fixes #20293

ACKs for top commit:
  laanwj:
    Code review ACK 3d71d16d1e

Tree-SHA512: 03fafd5548ead0c4ffe9ebcc9eb2849f1d2fa7270fda4166419b86877d4e57dcf04460e465fbb9c90b42031f3c05d1b83f1b67a9f82c2a42980825ed1e7b52e6
2021-12-02 19:37:33 +01:00
fanquake
205877e55f
Merge bitcoin/bitcoin#23546: scripted-diff: Use clang-tidy syntax for C++ named arguments (tests only)
fa00447442 scripted-diff: Use clang-tidy syntax for C++ named arguments (MarcoFalke)
fae13c3989 doc: Use clang-tidy comments in crypto_tests (MarcoFalke)

Pull request description:

  Incorrect named args are source of bugs, like #22979.

  To allow them being checked by `clang-tidy`, use a format it can understand.

ACKs for top commit:
  shaavan:
    ACK fa00447442
  rajarshimaitra:
    ACK fa00447442
  jonatack:
    ACK fa00447442
  fanquake:
    ACK fa00447442

Tree-SHA512: 4d23a8363da81dfea21a4cd8516ab5e0dc70119e4d503f3f240f38573218b2c2e84083b97e956c62942d78b2f17490f8b3b2e8077d257644fda1d901e2b80507
2021-12-01 18:44:54 +08:00
Samuel Dobson
200d97faf2
Merge bitcoin/bitcoin#22868: wallet: Call load handlers without cs_wallet locked
f13a22a631 wallet: Call load handlers without cs_wallet locked (João Barbosa)

Pull request description:

  Don't have `cs_wallet` locked while calling each `context.wallet_load_fns`. A load handler can always lock `cs_wallet` if needed.

  The lock was added in 1c7e25db0c to satisfy TSAN. With 44c430ffac most of the code requiring the lock is in `CWallet::AttachChain`. A comment is added to warn about wallets_mutex and cs_wallet lock ordering.

ACKs for top commit:
  meshcollider:
    re-utACK f13a22a631
  ryanofsky:
    Code review ACK f13a22a631. Only change since last review is adding a lock order comment
  jonatack:
    ACK f13a22a631

Tree-SHA512: d51976c3aae4bebc2d1997c88edff712d21fc5523801f5614062a10f826e164579973aeb1981bb1cbc243ecff6af3250362f544c02a79e5d135cbbca1704be62
2021-11-27 22:30:46 +13:00
W. J. van der Laan
cf24152596
Merge bitcoin/bitcoin#21206: refactor: Make CWalletTx sync state type-safe
d8ee8f3cd3 refactor: Make CWalletTx sync state type-safe (Russell Yanofsky)

Pull request description:

  Current `CWalletTx` state representation makes it possible to set inconsistent states that won't be handled correctly by wallet sync code or serialized & deserialized back into the same form.

  For example, it is possible to call `setConflicted` without setting a conflicting block hash, or `setConfirmed` with no transaction index. And it's possible update individual `m_confirm` and `fInMempool` data fields without setting an overall consistent state that can be serialized and handled correctly.

  Fix this without changing behavior by using `std::variant`, instead of an enum and collection of fields, to represent sync state, so state tracking code is safer and more legible.

  This is a first step to fixing state tracking bugs https://github.com/bitcoin-core/bitcoin-devwiki/wiki/Wallet-Transaction-Conflict-Tracking, by adding an extra margin of safety that can prevent new bugs from being introduced as existing bugs are fixed.

ACKs for top commit:
  laanwj:
    re-ACK d8ee8f3cd3
  jonatack:
    Code review ACK d8ee8f3cd3

Tree-SHA512: b9f15e9d99dbdbdd3ef7a76764e11f66949f50e6227e284126f209e4cb106af6d55e9a9e8c7d4aa216ddc92c6d5acc6f4aa4746f209bbd77f03831b51a2841c3
2021-11-25 19:41:53 +01:00
João Barbosa
f13a22a631 wallet: Call load handlers without cs_wallet locked
Co-authored-by: Russell Yanofsky <russ@yanofsky.org>
2021-11-22 09:42:36 +00:00
MarcoFalke
fa00447442
scripted-diff: Use clang-tidy syntax for C++ named arguments
-BEGIN VERIFY SCRIPT-
 perl -0777 -pi -e 's:((\(|\{|,)(\n| )*)\/\* ?([^=* ]+) ?\*\/ ?:\1/*\4=*/:g' $( git ls-files ./src/test ./src/wallet/test )
-END VERIFY SCRIPT-
2021-11-19 12:41:47 +01:00
Andrew Chow
8fb57845ee Create a tr() descriptor bech32m DescriptorScriptPubKeyMan by default 2021-11-16 12:20:13 -05:00
Russell Yanofsky
d8ee8f3cd3 refactor: Make CWalletTx sync state type-safe
Current CWalletTx state representation makes it possible to set
inconsistent states that won't be handled correctly by wallet sync code
or serialized & deserialized back into the same form.

For example, it is possible to call setConflicted without setting a
conflicting block hash, or setConfirmed with no transaction index. And
it's possible update individual m_confirm and fInMempool data fields
without setting an overall consistent state that can be serialized and
handled correctly.

Fix this without changing behavior by using std::variant, instead of an
enum and collection of fields, to represent sync state, so state
tracking code is safer and more legible.

This is a first step to fixing state tracking bugs
https://github.com/bitcoin-core/bitcoin-devwiki/wiki/Wallet-Transaction-Conflict-Tracking,
by adding an extra margin of safety that can prevent new bugs from being
introduced as existing bugs are fixed.
2021-11-15 09:11:44 -05:00