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2021-07-22Merge bitcoin/bitcoin#22218: multiprocess: Add ipc::Context and ↵MarcoFalke
ipc::capnp::Context structs 3e33d170cc0a8f386791777f3cc597e2bd0bf2ee Add ipc::Context and ipc::capnp::Context structs (Russell Yanofsky) Pull request description: These are currently empty structs but they will be used to pass some function and object pointers from bitcoin application code to IPC hooks that run, for example, when a remote object is created or destroyed, or a new process is created. --- This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10). The commit was first part of larger PR #10102. ACKs for top commit: ariard: Code Review ACK 3e33d170 Tree-SHA512: fd949fae5f1a973d39cb97f2745821ab2f62b98e166e53bc2801f97dcde988e18faaaaa0ffc2a82c170938b3a18078b6162fa35460e6e7c635e681b3c9e5b0a6
2021-06-16refactor: reduce #ifdef ENABLE_EXTERNAL_SIGNER usageSjors Provoost
In particular this make the node interface independent on whether external signer support is compiled.
2021-06-12Merge bitcoin/bitcoin#22156: Allow tr() import only when Taproot is activeW. J. van der Laan
fbf485c9b2bf1d056bfea77345a15cf56a9cd786 Allow tr() import only when Taproot is active (Andrew Chow) Pull request description: To avoid issues around fund loss, only allow descriptor wallets to import `tr()` descriptors after taproot has activated. ACKs for top commit: sipa: utACK fbf485c9b2bf1d056bfea77345a15cf56a9cd786 fjahr: Code review ACK fbf485c9b2bf1d056bfea77345a15cf56a9cd786 laanwj: Code review ACK fbf485c9b2bf1d056bfea77345a15cf56a9cd786 prayank23: utACK https://github.com/bitcoin/bitcoin/pull/22156/commits/fbf485c9b2bf1d056bfea77345a15cf56a9cd786 Tree-SHA512: 83c43376515eea523dbc89bc5a0fde53e54aec492e49a40c2a33d80fc94aac459e232ae07b024b4bd75b58078c8d090bc7a2d69541c5d3d4834d2f4cfc9c8208
2021-06-10Allow tr() import only when Taproot is activeAndrew Chow
To avoid issues around fund loss, only allow descriptor wallets to import tr() descriptors after taproot has activated.
2021-06-10Add ipc::Context and ipc::capnp::Context structsRussell Yanofsky
These are currently empty structs but they will be used to pass some function and object pointers from bitcoin application code to IPC hooks that run, for example, when a remote object is created or destroyed, or a new process is created.
2021-06-10Rearrange fillPSBT argumentsRussell Yanofsky
Move fillPSBT input-output argument before output-only arguments. This is a temporary workaround which can go away with improvements to libmultiprocess code generator. Currently code generator figures out order of input-output parameters by looking at input list, but it would make more sense for it to take order from output list, so input-only parameters still have to be first but there is more flexibility for the other parameters.
2021-06-09Merge bitcoin-core/gui#4: UI external signer support (e.g. hardware wallet)Samuel Dobson
1c4b456e1a0ccf0397d652f8c18201c3224c5c21 gui: send using external signer (Sjors Provoost) 24815c6309431cb0797defaf7add1150bcf4b567 gui: wallet creation detects external signer (Sjors Provoost) 3f845ea2994f53e29abeb3fa158c35f1ee56e7e8 node: add externalSigners to interface (Sjors Provoost) 62ac119f919ae1160ed67af796f24b78025fa8e3 gui: display address on external signer (Sjors Provoost) 450cb40a344605dda3bcc39495c35869580b9fc2 wallet: add displayAddress to interface (Sjors Provoost) eef8d6452962cd4a8956d9ad268164715365b9ab gui: create wallet with external signer (Sjors Provoost) 6cdbc83e9341d1552faee4ccd8c190babc63e8d1 gui: add external signer path to options dialog (Sjors Provoost) Pull request description: Big picture overview in [this gist](https://gist.github.com/Sjors/29d06728c685e6182828c1ce9b74483d). This PR adds GUI support for external signers, based on the since merged bitcoin/bitcoin#16546 (RPC). The UX isn't amazing - especially the blocking calls - but it works. First we adds a GUI setting for the signer script (e.g. path to HWI): <img width="625" alt="Schermafbeelding 2019-08-05 om 19 32 59" src="https://user-images.githubusercontent.com/10217/62483415-e1ff1680-b7b7-11e9-97ca-8d2ce54ca1cb.png"> Then we add an external signer checkbox to the wallet creation dialog: <img width="374" alt="Schermafbeelding 2019-11-07 om 19 17 23" src="https://user-images.githubusercontent.com/10217/68416387-b57ee000-0194-11ea-9730-127d60273008.png"> It's checked by default if HWI detects a device. It also grabs the name. It then creates a fresh wallet and imports the keys. You can verify an address on the device (blocking...): <img width="673" alt="Schermafbeelding 2019-08-05 om 19 29 22" src="https://user-images.githubusercontent.com/10217/62483560-43bf8080-b7b8-11e9-9902-8a036116dc4b.png"> Sending, including coin selection, Just Works(tm) as long the device is present. ~External signer support is enabled by default when the GUI is configured and Boost::Process is present.~ External signer support remains disabled by default, see https://github.com/bitcoin/bitcoin/pull/21935. ACKs for top commit: achow101: Code Review ACK 1c4b456e1a0ccf0397d652f8c18201c3224c5c21 hebasto: ACK 1c4b456e1a0ccf0397d652f8c18201c3224c5c21, tested on Linux Mint 20.1 (Qt 5.12.8) with HWW `2.0.2-rc.1`. promag: Tested ACK 1c4b456e1a0ccf0397d652f8c18201c3224c5c21 but rebased with e033ca1379, with HWI 2.0.2, with Nano S and Nano X. meshcollider: re-code-review ACK 1c4b456e1a0ccf0397d652f8c18201c3224c5c21 Tree-SHA512: 3503113c5c69d40adb6ce364d8e7cae23ce82d032a00474ba9aeb6202eb70f496ef4a6bf2e623e5171e524ad31ade7941a4e0e89539c64518aaec74f4562d86b
2021-06-03Merge bitcoin/bitcoin#21353: interfaces: Stop exposing wallet destdata to guiW. J. van der Laan
f5ba424cd44619d9b9be88b8593d69a7ba96db26 wallet: Add IsAddressUsed / SetAddressUsed methods (Russell Yanofsky) 62252c95e5aa55f33a5ef22292d5d8161fcb892a interfaces: Stop exposing wallet destdata to gui (Russell Yanofsky) 985430d9b2e183c1f59a34472e413a8d00a7e6da test: Add gui test for wallet receive requests (Russell Yanofsky) Pull request description: Stop giving GUI access to destdata rows in database. Replace with narrow API just for saving and reading receive request information. This simplifies code and should prevent the GUI from interfering with other destdata like address-used status. It also adds some more GUI test coverage. There are no changes in behavior. ACKs for top commit: jarolrod: tACK f5ba424cd44619d9b9be88b8593d69a7ba96db26 laanwj: Code review ACK f5ba424cd44619d9b9be88b8593d69a7ba96db26 Tree-SHA512: 5423df4786e537a59013cb5bfb9e1bc29a7ca4b8835360c00cc2165a59f925fdc355907a4ceb8bca0285bb4946ba235bffa7645537a951ad03fd3b4cee17b6b0
2021-05-27node: add externalSigners to interfaceSjors Provoost
2021-05-27gui: display address on external signerSjors Provoost
2021-05-27wallet: add displayAddress to interfaceSjors Provoost
2021-04-23multiprocess: Add echoipc RPC method and testRussell Yanofsky
Add simple interfaces::Echo IPC interface with one method that just takes and returns a string, to test multiprocess framework and provide an example of how it can be used to spawn and call between processes.
2021-04-23multiprocess: Add comments and documentationRussell Yanofsky
2021-04-23multiprocess: Add bitcoin-node process spawning supportRussell Yanofsky
Add bitcoin-node startup code to let it spawn and be spawned by other processes
2021-04-23multiprocess: Add Ipc and Init interface definitionsRussell Yanofsky
2021-03-17refactor: post Optional<> removal cleanupsfanquake
2021-03-15scripted-diff: remove Optional & nulloptfanquake
-BEGIN VERIFY SCRIPT- git rm src/optional.h sed -i -e 's/Optional</std::optional</g' $(git grep -l 'Optional<' src) sed -i -e 's/{nullopt}/{std::nullopt}/g' $(git grep -l 'nullopt' src) sed -i -e 's/ nullopt;/ std::nullopt;/g' $(git grep -l 'nullopt' src) sed -i -e 's/ nullopt)/ std::nullopt)/g' $(git grep -l 'nullopt' src) sed -i -e 's/(nullopt)/(std::nullopt)/g' $(git grep -l 'nullopt' src) sed -i -e 's/ nullopt,/ std::nullopt,/g' $(git grep -l 'nullopt' src) sed -i -e 's/? nullopt :/? std::nullopt :/g' $(git grep -l 'nullopt' src) sed -i -e 's/: nullopt}/: std::nullopt}/g' $(git grep -l 'nullopt' src) sed -i -e '/optional.h \\/d' src/Makefile.am sed -i -e '/#include <optional.h>/d' src/test/fuzz/autofile.cpp src/test/fuzz/buffered_file.cpp src/test/fuzz/node_eviction.cpp sed -i -e 's/#include <optional.h>/#include <optional>/g' $(git grep -l '#include <optional.h>' src) -END VERIFY SCRIPT-
2021-03-11scripted-diff: remove MakeUnique<T>()fanquake
-BEGIN VERIFY SCRIPT- git rm src/util/memory.h sed -i -e 's/MakeUnique/std::make_unique/g' $(git grep -l MakeUnique src) sed -i -e '/#include <util\/memory.h>/d' $(git grep -l '#include <util/memory.h>' src) sed -i -e '/util\/memory.h \\/d' src/Makefile.am -END VERIFY SCRIPT-
2021-03-09Merge #18842: wallet: Mark replaced tx to not be in the mempool anymoreMarcoFalke
fa4e088cbac035b8029a10b492849540150d0622 wallet: Mark replaced tx to not be in the mempool anymore (MarcoFalke) Pull request description: The wallet does not mark the replaced tx as out-of-mempool. This causes failures in user scripts, because later RPCs may depend on this state change from `bumpfee`. For example, the following might fail on current master: ``` txid = sendtoaddress(...) bumpfee(txid) abandontransaction(txid) # fails because txid is still marked as "in mempool" ``` Fixes #18831 ACKs for top commit: meshcollider: utACK fa4e088cbac035b8029a10b492849540150d0622 ryanofsky: Code review ACK fa4e088cbac035b8029a10b492849540150d0622, and previous ACK faeedff5c87091fd83d2fb2b29eb49c948363f29 is also still valid in case there's a preference for the original fix Tree-SHA512: 9858f40f5fb5a43a7b584b5c4268b6befa82e6a84583be5206fe721bcb6c255e8d35479d347d0b9aed72703df49887c02b14ab680e8efdd28b90dd6b93d9439a
2021-03-07wallet: Mark replaced tx to not be in the mempool anymoreMarcoFalke
2021-03-04net: Replace enum CConnMan::NumConnections with enum class ConnectionDirectionLuke Dashjr
2021-03-03interfaces: Stop exposing wallet destdata to guiRussell Yanofsky
Stop giving GUI access to destdata rows in database. Replace with narrow API just for saving and reading receive request information. This simplifies code and should prevent the GUI from interfering with other destdata like address-used status. Note: No user-visible behavior is changing in this commit. New CWallet::SetAddressReceiveRequest() implementation avoids a bug in CWallet::AddDestData() where a modification would leave the previous value in memory while writing the new value to disk. But it doesn't matter because the GUI doesn't currently expose the ability to modify receive requests, only to add and erase them.
2021-01-07net: Add -natpmp command line optionHennadii Stepanov
2020-12-31scripted-diff: Bump copyright headersMarcoFalke
-BEGIN VERIFY SCRIPT- ./contrib/devtools/copyright_header.py update ./ -END VERIFY SCRIPT-
2020-12-07refactor: Get rid of more redundant chain methodsRussell Yanofsky
This just drops three interfaces::Chain methods replacing them with other calls. Motivation for removing these chain methods: - Need to get rid of findFirstBlockWithTimeAndHeight for #10102, which doesn't support overloaded methods - Followup from https://github.com/bitcoin/bitcoin/pull/16426#discussion_r412487403 - phantomcircuit comments about findNextBlock test http://www.erisian.com.au/bitcoin-core-dev/log-2020-06-06.html#l-214 Behavior is not changing in any way here. A TODO comment in ScanForWalletTransactions was removed, but just because it was invalid (see https://github.com/bitcoin/bitcoin/pull/19195#discussion_r448020762), not because it was implemented.
2020-12-03interface: remove unused estimateSmartFee method from nodeAntoine Poinsot
Co-Authored-by: MarcoFalke <falke.marco@gmail.com> Signed-off-by: Antoine Poinsot <darosior@protonmail.com>
2020-11-24Move WalletImpl from interfaces/wallet.cpp to wallet/interfaces.cppRussell Yanofsky
2020-11-24Move ChainImpl from interfaces/chain.cpp to node/interfaces.cppRussell Yanofsky
No changes to ChainImpl or any related classes (review with `git diff --color-moved=dimmed_zebra`)
2020-11-24Move NodeImpl from interfaces/node.cpp to node/interfaces.cppRussell Yanofsky
2020-09-26[send] Make send RPCs return fee reasonSishir Giri
2020-09-22Add 'sequence' zmq publisher to track all block (dis)connects, mempool deltasGregory Sanders
Using the zmq notifications to avoid excessive mempool polling can be difficult given the current notifications available. It announces all transactions being added to mempool or included in blocks, but announces no evictions and gives no indication if the transaction is in the mempool or a block. Block notifications for zmq are also substandard, in that it only announces block tips, while all block transactions are still announced. This commit adds a unified stream which can be used to closely track mempool: 1) getrawmempool to fill out mempool knowledge 2) if txhash is announced, add or remove from set based on add/remove flag 3) if blockhash is announced, get block txn list, remove from those transactions local view of mempool 4) if we drop a sequence number, go to (1) The mempool sequence number starts at the value 1, and increments each time a transaction enters the mempool, or is evicted from the mempool for any reason, including block inclusion. The mempool sequence number is published via ZMQ for any transaction-related notification. These features allow for ZMQ/RPC consumer to track mempool state in a more exacting way, without unnecesarily polling getrawmempool. See interface_zmq.py::test_mempool_sync for example usage.
2020-09-08Do not create default walletAndrew Chow
No longer create a default wallet. The default wallet will still be loaded if it exists and not other wallets were specified (anywhere, including settings.json, bitcoin.conf, and command line). Tests are updated to be started with -wallet= if they need the default wallet. Added test to wallet_startup.py testing that no default wallet is created and that it is loaded if it exists and no other wallets were specified.
2020-09-07Merge #19619: Remove wallet.dat path handling from wallet.cpp, rpcwallet.cppSamuel Dobson
7bf6dfbb484adfda3b8df26ee3e2ebda239dd263 wallet: Remove path checking code from bitcoin-wallet tool (Russell Yanofsky) 77d5bb72b8722ec7a6c7c33479a532cbd5870ba4 wallet: Remove path checking code from createwallet RPC (Russell Yanofsky) a987438e9d9cad0b5530e218a447928485f3fd93 wallet: Remove path checking code from loadwallet RPC (Russell Yanofsky) 8b5e7297c02f3100a9cb27bfe206e3fc617ec173 refactor: Pass wallet database into CWallet::Create (Russell Yanofsky) 3c815cfe54087fd139169161d2fd175e99840e6a wallet: Remove Verify and IsLoaded methods (Russell Yanofsky) 0d94e6062547f288a75921d2433458a44a5f2297 refactor: Use DatabaseStatus and DatabaseOptions types (Russell Yanofsky) b5b414151af32e5a07b5757b64482d77519d77c0 wallet: Add MakeDatabase function (Russell Yanofsky) 288b4ffb6b291f0466d513ff3c40af6758ca7c88 Remove WalletLocation class (Russell Yanofsky) Pull request description: Get rid of file path handling in wallet application code and move it down to database layer. There is no change in behavior except for some changed error messages. Motivation for this change is to make code more understandable, but also to prepare for adding SQLite support in #19077 so SQLite implementation can be contained at the database layer and wallet loading code does not need to become more complicated. ACKs for top commit: achow101: ACK 7bf6dfbb484adfda3b8df26ee3e2ebda239dd263 meshcollider: Code re-review and functional test run ACK 7bf6dfbb484adfda3b8df26ee3e2ebda239dd263 Tree-SHA512: 23ad18324c9e8947f0cf88a3734c2e9fb25536b2cb4d552cf5d1a4ade320fbffb73bb2d1b3a99585c11630aa7092e0fcfc2dd4fe65b91e3a54161433a5cd13cb
2020-09-05Remove mempool global from interfacesMarcoFalke
2020-09-05refactor: Add IsRBFOptInEmptyMempoolMarcoFalke
Co-authored-by: John Newbery <jonnynewbs@gmail.com>
2020-09-03refactor: Use DatabaseStatus and DatabaseOptions typesRussell Yanofsky
No changes in behavior. Just replaces arguments and return types
2020-09-03Remove WalletLocation classRussell Yanofsky
This removes a source of complexity and indirection that makes it harder to understand path checking code. Path checks will be simplified in upcoming commits. There is no change in behavior in this commit other than a slightly more descriptive error message in `loadwallet` if the default "" wallet can't be found. (The error message is improved more in upcoming commit "wallet: Remove path checking code from loadwallet RPC".)
2020-09-01wallet: Reload previously loaded wallets on GUI startupAndrew Chow
Enable the GUI to also use the load_on_startup feature. Wallets loaded in the GUI always have load_on_startup=true. When they are unloaded from the GUI, load_on_startup=false. To facilitate this change, UpdateWalletSetting is moved into the wallet module and called from within LoadWallet, RemoveWallet, and Createwallet. This change does not actually touch the GUI code but rather the wallet functions that are shared between the GUI and RPC.
2020-08-27refactor: Move wallet methods out of chain.h and node.hRussell Yanofsky
Add WalletClient interface so node interface is cleaner and don't need wallet-specific methods. The new NodeContext::wallet_client pointer will also be needed to eliminate global wallet variables like ::vpwallets, because createWallet(), loadWallet(), getWallets(), etc methods called by the GUI need a way to get a reference to the list of open wallets if it is no longer a global variable. Also tweaks splash screen registration for load wallet events to be delayed until after wallet client is created.
2020-08-27refactor: Create interfaces earlier during initializationRussell Yanofsky
Add AppInitInterfaces function so wallet chain and chain client interfaces are created earlier during initialization. This is needed in the next commit to allow the gui splash screen to be able to register for wallet events through a dedicated WalletClient interface instead managing wallets indirectly through the Node interface. This only works if the wallet client interface is created before the splash screen needs to use it.
2020-08-27Merge #19289: wallet: GetWalletTx and IsMine require cs_wallet lockWladimir J. van der Laan
b8405b833ad28351c80fb10f6f896f974013fd9e wallet: IsChange requires cs_wallet lock (João Barbosa) d8441f30ff57e4ae98cff6694c995eaffc19c51a wallet: IsMine overloads require cs_wallet lock (João Barbosa) a13cafc6c6998baedf3c5766259c21fcd763b99e wallet: GetWalletTx requires cs_wallet lock (João Barbosa) Pull request description: This change removes some unlock/lock and lock/lock cases regarding `GetWalletTx` and `IsMine` overloads. ACKs for top commit: laanwj: Code review ACK b8405b833ad28351c80fb10f6f896f974013fd9e ryanofsky: Code review ACK b8405b833ad28351c80fb10f6f896f974013fd9e. Just new commit since last review changing IsChange GetChange locks and adding annotations Tree-SHA512: 40d37c4fe5d10a1407f57d899d5822bb285633d8dbfad8afcf15a9b41b428ed9971a9a7b1aae84318371155132df3002699a15dab56e004527d50c889829187d
2020-08-26gui: Partially revert #10244 gArgs and Params changesRussell Yanofsky
Change gui code to use gArgs, Params() functions directly instead of going through interfaces::Node. Remotely accessing bitcoin-node ArgsManager from bitcoin-gui works fine in https://github.com/bitcoin/bitcoin/pull/10102, when bitcoin-gui spawns a new bitcoin-node process and controls its startup, but for bitcoin-gui to support -ipcconnect option in https://github.com/bitcoin/bitcoin/pull/19461 and connect to an existing bitcoin-node process, it needs ability to parse arguments itself before connecting out. This change also simplifies https://github.com/bitcoin/bitcoin/pull/10102 a bit, by making the bitcoin-gui -> bitcoin-node startup sequence more similar to the bitcoin-node -> bitcoin-wallet startup sequence where the parent process parses arguments and passes them to the child process instead of the parent process using the child process to parse arguments.
2020-08-24init: Pass reference to ArgsManager around instead of relying on globalMarcoFalke
2020-08-17wallet: IsMine overloads require cs_wallet lockJoão Barbosa
2020-08-13Add loadwallet and createwallet RPC load_on_startup optionsRussell Yanofsky
This maintains a persistent list of wallets stored in settings that will automatically be loaded on startup. Being able to load a wallet automatically on startup will be more useful in the GUI when the option to create wallets is added in #15006, but it's reasonable to expose this feature by RPC as well.
2020-08-12Add BlockAndHeaderTipInfo to the node interface/appInitJonas Schnelli
2020-08-07Merge #19098: test: Remove duplicate NodeContext hacksMarcoFalke
edc316020e8270dafc5e31465d532baebdafd3dd test: Remove duplicate NodeContext hacks (Russell Yanofsky) Pull request description: Qt tests currently are currently using two NodeContext structs at the same time, one in interfaces::NodeImpl::m_context, and the other in BasicTestingSetup::m_node, and the tests have hacks transferring state between them. Fix this by getting rid of the NodeImpl::m_context struct and making it a pointer. This way a common BitcoinApplication object can be used for all qt tests, but they can still have their own testing setups. Non-test code is changing but non-test behavior is still the same as before. Motivation for this PR is to be able to remove the "std::move(test.m_node.connman)" and mempool hacks for swapping individual NodeContext members in Qt tests, because followup PR #19099 adds yet another member (wallet_client) that needs to be swapped. After this change, the whole NodeContext struct can be swapped instead of individual members, so the workarounds are less fragile and invasive. ACKs for top commit: MarcoFalke: crACK edc316020e8270dafc5e31465d532baebdafd3dd 🌮 promag: ACK edc316020e8270dafc5e31465d532baebdafd3dd. Tree-SHA512: c1650e4127f43a4020304ca7c13b5d9122fb5723aacd8fa1cf855d03c6052fcfb7685810aa2a5ef708561015f0022fecaacbad479295104ca45d2c17579466a4
2020-07-23Merge #15935: Add <datadir>/settings.json persistent settings storageMarcoFalke
9c69cfe4c54e38edd2f54303be2f8a53dcf5bad8 Add <datadir>/settings.json persistent settings storage. (Russell Yanofsky) eb682c5700e7a9176d0104d470b83ff9aa3589e8 util: Add ReadSettings and WriteSettings functions (Russell Yanofsky) Pull request description: Persistent settings are used in followup PRs #15936 to unify gui settings between bitcoin-qt and bitcoind, and #15937 to add a load_on_startup flag to the loadwallet RPC and maintain a dynamic list of wallets that should be loaded on startup that also can be shared between bitcoind and bitcoin-qt. ACKs for top commit: MarcoFalke: Approach re-ACK 9c69cfe4c54e38edd2f54303be2f8a53dcf5bad8 🌾 jnewbery: utACK 9c69cfe4c54e38edd2f54303be2f8a53dcf5bad8 Tree-SHA512: 39fcc6051717117c9141e934de1d0d3f739484be4685cdf97d54de967c8c816502b4fd0de12114433beaa5c5b7060c810fd8ae4e2b3ce7c371eb729ac01ba2e1
2020-07-13test: Remove duplicate NodeContext hacksRussell Yanofsky
Qt tests currently are currently using two NodeContext structs at the same time, one in interfaces::NodeImpl::m_context, and the other in BasicTestingSetup::m_node, and the tests have hacks transferring state between them. Fix this by getting rid of the NodeImpl::m_context struct and making it a pointer. This way a common BitcoinApplication object can be used for all qt tests, but they can still have their own testing setups. Non-test code is changing but non-test behavior is still the same as before. Motivation for this PR is to be able to remove the "std::move(test.m_node.connman)" and mempool hacks for swapping individual NodeContext members in Qt tests, because followup PR #19099 adds yet another member (wallet_client) that needs to be swapped. After this change, the whole NodeContext struct can be swapped instead of individual members, so the workarounds are less fragile and invasive.
2020-07-11Add <datadir>/settings.json persistent settings storage.Russell Yanofsky
Persistent settings are used in followup PRs #15936 to unify gui settings between bitcoin-qt and bitcoind, and #15937 to add a load_on_startup flag to the loadwallet RPC and maintain a dynamic list of wallets that should be loaded on startup that also can be shared between bitcoind and bitcoin-qt.