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28daf0d1c4
dash/doc/multiprocess.md
fanquake 7e023c394f
Merge #17934: doc: Use CONFIG_SITE variable instead of --prefix option 
223b1ba7d90509a47ea07af46f4b9c3b8efbc9f8 doc: Use CONFIG_SITE instead of --prefix (Hennadii Stepanov)

Pull request description:

  The current examples of `--prefix=...` option usage to point `configure` script to appropriate `depends` directory is not [standard](https://www.gnu.org/prep/standards/html_node/Directory-Variables.html). This causes some [confusion](https://github.com/bitcoin/bitcoin/pull/16691) and a bit of inconvenience.

  Consider a CentOS 7 32 bit system. Packages `libdb4-devel`, `libdb4-cxx-devel`, `miniupnpc-devel` and `zeromq-devel` are unavailable from repos. After recommended build with depends:
  ```
  cd depends
  make
  cd ..
  ./autogen.sh
  ./configure --prefix=$PWD/depends/i686-pc-linux-gnu
  make
  ```
  a user is unable to `make install` compiled binaries neither locally (to `~/.local`) nor system-wide (to `/usr/local`) as `--prefix` is set already.

  Meanwhile, the standard approach with using [`config.site`](https://www.gnu.org/software/automake/manual/html_node/config_002esite.html) files allows both possibilities:

  ```
  cd depends
  make
  cd ..
  ./autogen.sh
  CONFIG_SITE=$PWD/depends/i686-pc-linux-gnu/share/config.site ./configure --prefix ~/.local
  make
  make install
  ```

  or

  ```
  CONFIG_SITE=$PWD/depends/i686-pc-linux-gnu/share/config.site ./configure
  make
  sudo make install  # install to /usr/local
  ```

  Moreover, this approach is used in [Gitian descriptors](https://github.com/bitcoin/bitcoin/tree/master/contrib/gitian-descriptors) already.

ACKs for top commit:
  practicalswift:
    ACK 223b1ba7d90509a47ea07af46f4b9c3b8efbc9f8: patch looks correct
  fanquake:
    ACK 223b1ba7d90509a47ea07af46f4b9c3b8efbc9f8

Tree-SHA512: 46d97924f0fc7e95ee4566737cf7c2ae805ca500e5c49af9aa99ecc3acede4b00329bc727a110aa1b62618dfbf5d1ca2234e736f16fbdf96d6ece5f821712f54
2024-04-11 02:26:03 +07:00

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Multiprocess Dash

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.

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), 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.

Next steps

Specific next steps after backporting bitcoin#10102 will be:

  • 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.
  • Adding -server and -rpcbind options to the dash-wallet executable so wallet processes can handle RPC requests directly without going through the node.
  • 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/.
  • Adding sandbox features, restricting subprocess access to resources and data. See https://eklitzke.org/multiprocess-bitcoin.

Debugging

After backporting bitcoin#10102, the -debug=ipc command line option can be used to see requests and responses between processes.

Installation

The multiprocess feature requires Cap'n Proto and libmultiprocess as dependencies. A simple way to get starting using it without installing these dependencies manually is to use the depends system with the MULTIPROCESS=1 dependency option passed to make:

cd <DASH_SOURCE_DIRECTORY>
make -C depends NO_QT=1 MULTIPROCESS=1
CONFIG_SITE=$PWD/depends/x86_64-pc-linux-gnu/share/config.site ./configure
make
src/dash-node -regtest -printtoconsole -debug=ipc
DASHD=dash-node test/functional/test_runner.py

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).

Alternately, you can install Cap'n Proto and 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. See Installation section of the libmultiprocess readme for install steps. See build-unix.md and build-osx.md for information about installing dependencies in general.