Building on #10102, this adds an -ipcconnect option to bitcoin-gui that connects the GUI to an existing bitcoin-node process already running in the background instead of spawning a new bitcoin-node process. This allows the GUI to be started and stopped independently of the node. By default with this change, bitcoin-gui will check if a <datadir>/sockets/node.sock socket exists and try to connect to that. If that doesn’t work, it will spawn a new node process and start up the same way it did before this PR.
The default bitcoin-gui connect option is -ipcconnect=auto, which tries to connect if possible as described above, and spawns a new bitcoin-node process if not possible. Other supported options are -noipcconnect to never connect to an existing node and always spawn a new one, -ipcconnect to require a connection and fail if it can’t be established, and -ipcconnect=unix:<socket> to require a connection and use a custom socket path.
With this PR, basic functionality works and gui instances can connect and disconnect from a running node. But there are rough edges: If a gui process doesn’t shut down cleanly, the node can see unhandled IpcExceptions, and if node command line options are passed to bitcoin-gui and bitcoin-gui connects to an exiting bitcoin-node process instead of spawning a new one, the node options will be silently ignored.
These changes require multiprocess support and this PR has no effect unless bitcoin is configured with --enable-multiprocess as described in doc/multiprocess.md
#25722 (refactor: Use util::Result class for wallet loading by ryanofsky)
#25665 (refactor: Add util::Result failure values, multiple error and warning messages by ryanofsky)
If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.
laanwj
commented at 5:30 pm on July 9, 2020:
member
Concept ACK, I’ve only reviewed the option help yet but -ipcconnect SGTM as option name, it reminds of -rpcconnect of the -cli client.
in
src/bitcoin-wallet.cpp:34
in
70aaca9ebeoutdated
29@@ -28,15 +30,18 @@ static void SetupWalletToolArgs()
30 gArgs.AddArg("-wallet=<wallet-name>", "Specify wallet name", ArgsManager::ALLOW_ANY | ArgsManager::NETWORK_ONLY, OptionsCategory::OPTIONS);
31 gArgs.AddArg("-debug=<category>", "Output debugging information (default: 0).", ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
32 gArgs.AddArg("-printtoconsole", "Send trace/debug info to console (default: 1 when no -debug is true, 0 otherwise).", ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
33+ if (include_ipc) {
34+ gArgs.AddArg("-ipcconnect=<address>, -noipcconnect", "Connect to bitcoin-node process in the background to perform online operations. Valid <address> values are 'auto' to try connecting to default socket in <datadir>/sockets/node.sock, but proceed offline if it isn't available, 'unix' to connect to the default socket and fail if it isn't available, 'unix:<socket path>' to connect to a socket at a nonstandard path. Default value: auto", ArgsManager::ALLOW_ANY, OptionsCategory::IPC);
I think this is the only case of multiple options separated by , inside the first argument of ArgsManager::AddArg. I don’t know if it’s strictly wrong, as it’s not currently parsed in any way, but maybe the idea is to do so in the future. @MarcoFalke?
I think this is the only case of multiple options separated by , inside the first argument of ArgsManager::AddArg. I don’t know if it’s strictly wrong, as it’s not currently parsed in any way, but maybe the idea is to do so in the future. @MarcoFalke?
Thanks, dropped nonstandard formatting and updated description in base PR #19460. No reason to separately list -no prefix.
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Rebased 70aaca9ebecb802f7da4babd27a79a0551225475 -> 4041990fcba01a5c6eb22b827b2220f2bd8ee666 (pr/ipc-gui.1 -> pr/ipc-gui.2, compare) on top of #19460 pr/ipc-connect.3
Rebased 4041990fcba01a5c6eb22b827b2220f2bd8ee666 -> 0714770d6bf52fbf46a50aff298df8ffdf4eb3ff (pr/ipc-gui.2 -> pr/ipc-gui.3, compare) on top of #19460 pr/ipc-connect.4
Rebased 878e11049c97564f81018381b88bf314ce4c4f01 -> 5c05c38c1a6185ee18eaf74948cf28fd1560abf4 (pr/ipc-gui.4 -> pr/ipc-gui.5, compare) on top of #19460 pr/ipc-connect.7
Rebased 5c05c38c1a6185ee18eaf74948cf28fd1560abf4 -> 2b9fbc08cc9f27dd092798b75afa1e2318e749c9 (pr/ipc-gui.5 -> pr/ipc-gui.6, compare) on top of #19460 pr/ipc-connect.8
Rebased 2b9fbc08cc9f27dd092798b75afa1e2318e749c9 -> 6f39b4689aea86283b43add4bdebda11dee4d73e (pr/ipc-gui.6 -> pr/ipc-gui.7, compare) on top of #19460 pr/ipc-connect.9
Rebased 6f39b4689aea86283b43add4bdebda11dee4d73e -> e2e2a06bf91cc321eb7e6cab2c19cfc4984dfe1c (pr/ipc-gui.7 -> pr/ipc-gui.8, compare) on top of #19460 pr/ipc-connect.10
Rebased e2e2a06bf91cc321eb7e6cab2c19cfc4984dfe1c -> 137225d7ba437d7d14e122a3eb35512ef8648041 (pr/ipc-gui.8 -> pr/ipc-gui.9, compare) on top of #19460 pr/ipc-connect.14
Rebased 137225d7ba437d7d14e122a3eb35512ef8648041 -> 871891d38cb3a4b73fa2016de70990f221662d90 (pr/ipc-gui.9 -> pr/ipc-gui.10, compare) on top of #19460 pr/ipc-connect.15
Rebased 871891d38cb3a4b73fa2016de70990f221662d90 -> 4b045d994b82bb24d0cab1efd5488575b9e7851d (pr/ipc-gui.10 -> pr/ipc-gui.11, compare) on top of #19460 pr/ipc-connect.16 due to conflict with bitcoin-core/gui#233
Rebased 4b045d994b82bb24d0cab1efd5488575b9e7851d -> 7cb12b4bc81c7e8978830e427f9d36b8590d9848 (pr/ipc-gui.11 -> pr/ipc-gui.12, compare) on top of #19460 pr/ipc-connect.19
Rebased 7cb12b4bc81c7e8978830e427f9d36b8590d9848 -> e7dfe88e2ab772c4eed939dd5bda53c42827cac8 (pr/ipc-gui.12 -> pr/ipc-gui.13, compare) on top of #19460 pr/ipc-connect.21
Rebased e7dfe88e2ab772c4eed939dd5bda53c42827cac8 -> 4dc8af0440073813101b85360482713c7abc6949 (pr/ipc-gui.13 -> pr/ipc-gui.14, compare) on top of #19460 pr/ipc-connect.22
Rebased 4dc8af0440073813101b85360482713c7abc6949 -> c997272eb0a6c805f098c920d8210221f770672f (pr/ipc-gui.14 -> pr/ipc-gui.15, compare) on top of #19460 pr/ipc-connect.24 due to conflict with bitcoin-core/gui#381
Rebased c997272eb0a6c805f098c920d8210221f770672f -> e23cf8171fdd6e1187731dd2393fcd64469ffd80 (pr/ipc-gui.15 -> pr/ipc-gui.16, compare) on top of #19460 pr/ipc-connect.25 due to conflict with bitcoin-core/gui#434
Rebased e23cf8171fdd6e1187731dd2393fcd64469ffd80 -> f2f33658dddd45477e43bcad749833f6fd336bb2 (pr/ipc-gui.16 -> pr/ipc-gui.17, compare) on top of #19460 pr/ipc-connect.26
Rebased f2f33658dddd45477e43bcad749833f6fd336bb2 -> f8d4a15805296edb365602a37875637610fe77c7 (pr/ipc-gui.17 -> pr/ipc-gui.18, compare) on top of #19460 pr/ipc-connect.28
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Needs rebase 🎉
What was the magic incantation again to tunnel a unix socket over SSH? I’ll try if I can run the GUI on a different machine than the node.
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ClaraBara22
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Thank you
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Sjors
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What was the magic incantation again to tunnel a unix socket over SSH? I’ll try if I can run the GUI on a different machine than the node.
On an Ubuntu 22.10 machine I ran src/bitcoin-node -ipcbind=unix:///tmp/node.sock. I then opened an SSH connection: ssh -L/tmp/remote-node.sock:/tmp/node.sock ubuntu. And then on the mac I connected the GUI: src/bitcoin-gui -ipconnect=unix:///tmp/remote-node.sock
I connected just after the node caught up on old blocks. It had the most recent block, but the logs show it as 0.999998% finished. The UI displayed a nonsensical status for that:
Once a new block came in a few minutes later, the sync dialog was correctly dismissed. Also, when I started the node again and it had to sync a bunch of blocks, the progress dialog did work correctly. Except that the ETA was always 0 seconds.
Other than that, it seems to work. Cool stuff!
When I exit the GUI and after that stop bitcoind the latter crashes:
0^C2023-02-11T12:02:40Z [rpc] Interrupting HTTP RPC server
12023-02-11T12:02:40Z [rpc] Interrupting RPC
22023-02-11T12:02:40Z tor: Thread interrupt
32023-02-11T12:02:40Z Shutdown: In progress...
42023-02-11T12:02:40Z addcon thread exit
52023-02-11T12:02:40Z [rpc] Stopping HTTP RPC server
62023-02-11T12:02:40Z torcontrol thread exit
72023-02-11T12:02:40Z [rpc] Stopping RPC
82023-02-11T12:02:40Z [rpc] RPC stopped.
9terminate called after throwing an instance of 'ipc::Exception'
10 what(): kj::Exception: kj/async-io-unix.c++:304: disconnected: ::read(fd, buffer, maxBytes): Connection reset by peer
11stack: 7ff9e59af780 5604c599569c 5604c594b36612Aborted (core dumped)
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Sjors
commented at 10:33 am on May 5, 2023:
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When I exit the GUI and after that stop bitcoind the latter crashes.
This still happens on 5f91aa3d8b47cee97e625c3b5689a37dbd941eff. Same setup as above: node and wallet running on Ubuntu 23.04 with a GUI client connecting from macOS using a unix socket of SSH.
But now I’ve notice this happens even if you don’t connect to it, i.e. starting without -ipcbind.
After letting the chain sync (a few days worth of blocks), I shut it down. At that point the log (on Ubuntu):
(update: it’s unrelated to the commits in this PR, I added a comment on #10102 (comment))
Sjors
commented at 11:41 am on May 5, 2023:
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I’m able to produce another crash that may be related to this PR. When using an external signer that’s connected to the Ubuntu machine, and trying to spend with it from the macOs GUI. After I click Sign on device, and hit “send”:
0Assertion failed: (!complete), function sendButtonClicked, file sendcoinsdialog.cpp, line 525.
1zsh: abort src/bitcoin-gui -ipcconnect=unix:///tmp/remote-node.sock
It also crashes if I create a PSBT (options -> wallet -> enable psbt controls) instead, just a different line
0Assertion failed: (!complete), function sendButtonClicked, file sendcoinsdialog.cpp, line 509.
Both nodes were configured with have --enable-external-signer. I’m able to call enumeratesigners from the console.
These asserts happen after calling fillPSBT(without signing (This prevents an external from being called prematurely). complete can’t be possibly be true, hence the assert.
ryanofsky
commented at 2:44 pm on May 5, 2023:
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Thanks Sjors, I’m trying to reproduce the shutdown error but didn’t succeed yet. Will try again with a mainnet node. I didn’t look into the external signer bug yet, but maybe that is more straightforward. In both cases running with -debug=ipc could make it clearer what’s going on, especially in the shutdown case. Probably what is happening in that case is that some thread is trying make an IPC call after the socket is closed, so an ipc::Exception is raised which is uncaught. Fix might be synchronizing the IPC call & socket close, or just catching the exception and handling it
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Add capnp serialization code for bitcoin types
- Add capnp ToBlob, ToArray, Wrap, Serialize, and Unserialize helper functions
- Add support for std::chrono::seconds capnp serialization
- Add support for util::Result capnp serialization
e7619a84bd
Add capnp wrapper for Handler interface76fd4e56c4
Add capnp wrapper for Chain interfacef6c7786c41
multiprocess: Expose Chain interface
Expose Chain interface to external processes spawning or connecting to
bitcoin-node.
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Add `-ipcconnect` option to `bitcoin-gui` to allow connecting gui to an
existing node instead of starting a new node process, so it is possible to
start and stop the gui independently of the node.
This change doesn't add an -ipcbind option to the bitcoin-wallet (which would
allow the gui to control wallet processes without going through the node), but
this would be a logical extension to add in the future.
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