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e2bab2aa162ae38b2bf8195b577c982402fbee9d multiprocess: add multiprocess travis configuration (Russell Yanofsky) 603fd6a2e708c04ef6c9880f89d0a4cbaa6fc7c5 depends: add MULTIPROCESS depends option (Russell Yanofsky) 5d1377b52bfcd4edf8553aaf332bfeb92fc554cc build: multiprocess autotools changes (Russell Yanofsky) Pull request description: This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10). --- This PR consists of build changes only. It adds an `--enable-multiprocess` autoconf option (off by default and marked experimental), that builds new `bitcoin-node` and `bitcoin-gui` binaries. These currently function the same as existing `bitcoind` and `bitcoin-qt` binaries, but are extended in #10102 with IPC features to execute node, wallet, and gui functions in separate processes. In addition to adding the `--enable-multiprocess` config flag, it also adds a depends package and autoconf rules to build with the [libmultiprocess](https://github.com/chaincodelabs/libmultiprocess) library, and it adds new travis configuration to exercise the build code and run functional tests with the new binaries. The changes in this PR were originally part of #10102 but were moved into #16367 to be able to develop and review the multiprocess build changes independently of the code changes. #16367 was briefly merged and then reverted in #18588. Only change since #16367 has been dropping the `native_boost.mk` depends package which was pointed out to be no longer necessary in https://github.com/bitcoin/bitcoin/pull/16367#issuecomment-596484337 and https://github.com/bitcoin/bitcoin/pull/18588#pullrequestreview-391765649 ACKs for top commit: practicalswift: ACK e2bab2aa162ae38b2bf8195b577c982402fbee9d Sjors: tACK e2bab2aa162ae38b2bf8195b577c982402fbee9d on macOS 10.15.4 hebasto: ACK e2bab2aa162ae38b2bf8195b577c982402fbee9d, tested on Linux Mint 19.3 (x86_64): Tree-SHA512: b5a76eab5abf63d9d8b6d628cbdff4cc1888eef15cafa0a5d56369e2f9d02595fed623f4b74b2cf2830c42c05a774f0943e700f9c768a82d9d348cad199e135c
36 lines
3.7 KiB
Markdown
36 lines
3.7 KiB
Markdown
# Multiprocess Dash
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On unix systems, the `--enable-multiprocess` build option can be passed to `./configure` to build new `dash-node`, `dash-wallet`, and `dash-gui` executables alongside existing `dashd` and `dash-qt` executables.
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`dash-node` is a drop-in replacement for `dashd`, and `dash-gui` is a drop-in replacement for `dash-qt`, and there are no differences in use or external behavior between the new and old executables. But internally (after backporting [bitcoin#10102](https://github.com/bitcoin/bitcoin/pull/10102)), `dash-gui` will spawn a `dash-node` process to run P2P and RPC code, communicating with it across a socket pair, and `dash-node` will spawn `dash-wallet` to run wallet code, also communicating over a socket pair. This will let node, wallet, and GUI code run in separate address spaces for better isolation, and allow future improvements like being able to start and stop components independently on different machines and environments.
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## Next steps
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Specific next steps after backporting [bitcoin#10102](https://github.com/bitcoin/bitcoin/pull/10102) will be:
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- [ ] Adding `-ipcbind` and `-ipcconnect` options to `dash-node`, `dash-wallet`, and `dash-gui` executables so they can listen and connect to TCP ports and unix socket paths. This will allow separate processes to be started and stopped any time and connect to each other.
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- [ ] Adding `-server` and `-rpcbind` options to the `dash-wallet` executable so wallet processes can handle RPC requests directly without going through the node.
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- [ ] Supporting windows, not just unix systems. The existing socket code is already cross-platform, so the only windows-specific code that needs to be written is code spawning a process and passing a socket descriptor. This can be implemented with `CreateProcess` and `WSADuplicateSocket`. Example: https://memset.wordpress.com/2010/10/13/win32-api-passing-socket-with-ipc-method/.
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- [ ] Adding sandbox features, restricting subprocess access to resources and data. See [https://eklitzke.org/multiprocess-bitcoin](https://eklitzke.org/multiprocess-bitcoin).
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## Debugging
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After backporting [bitcoin#10102](https://github.com/bitcoin/bitcoin/pull/10102), the `-debug=ipc` command line option can be used to see requests and responses between processes.
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## Installation
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The multiprocess feature requires [Cap'n Proto](https://capnproto.org/) and [libmultiprocess](https://github.com/chaincodelabs/libmultiprocess) as dependencies. A simple way to get starting using it without installing these dependencies manually is to use the [depends system](../depends) with the `MULTIPROCESS=1` [dependency option](../depends#dependency-options) passed to make:
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```
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cd <DASH_SOURCE_DIRECTORY>
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make -C depends NO_QT=1 MULTIPROCESS=1
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./configure --prefix=$PWD/depends/x86_64-pc-linux-gnu
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make
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src/dash-node -regtest -printtoconsole -debug=ipc
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DASHD=dash-node test/functional/test_runner.py
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```
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The configure script will pick up settings and library locations from the depends directory, so there is no need to pass `--enable-multiprocess` as a separate flag when using the depends system (it's controlled by the `MULTIPROCESS=1` option).
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Alternately, you can install [Cap'n Proto](https://capnproto.org/) and [libmultiprocess](https://github.com/chaincodelabs/libmultiprocess) packages on your system, and just run `./configure --enable-multiprocess` without using the depends system. The configure script will be able to locate the installed packages via [pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/). See [Installation](https://github.com/chaincodelabs/libmultiprocess#installation) section of the libmultiprocess readme for install steps. See [build-unix.md](build-unix.md) and [build-osx.md](build-osx.md) for information about installing dependencies in general.
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