Crates.io | ra-multiplex |
lib.rs | ra-multiplex |
version | 0.2.4 |
source | src |
created_at | 2022-01-29 18:11:59.392878 |
updated_at | 2024-05-15 12:28:30.661239 |
description | share one rust-analyzer server instance between multiple LSP clients to save resources |
homepage | |
repository | https://github.com/pr2502/ra-multiplex |
max_upload_size | |
id | 523722 |
size | 120,530 |
Multiplex server for rust-analyzer
, allows multiple LSP clients (editor
windows) to share a single rust-analyzer
instance per cargo workspace.
ra-multiplex
acts like rust-analyzer
but only connects to a TCP socket at
127.0.0.1:27631
and pipes stdin and stdout through it.
Depending on the workspaceFolders
provided by your editor during
initialization it can reuse an already spawned rust-analyzer
instance.
Because neither LSP nor rust-analyzer
itself support multiple clients
per server ra-multiplex
intercepts the handshake process and modifies IDs
of requests and responses to track which response belongs to which client.
Because not all messages can be tracked this way it drops some, notably it
drops any requests from the server, this appears to not be a problem with
coc-rust-analyzer
in neovim but YMMV.
If you have any problems you're welcome to open issues on this repository.
Build the project with
$ cargo build --release
Run ra-multiplex
in server mode, make sure that rust-analyzer
is in your
PATH
:
$ which rust-analyzer
/home/user/.cargo/bin/rust-analyzer
$ target/release/ra-multiplex --help
share one rust-analyzer server instance between multiple LSP clients to save resources
Usage: ra-multiplex [COMMAND]
Commands:
client Connect to a ra-mux server [default]
server Start a ra-mux server
status Print server status
reload Reload workspace
help Print this message or the help of the given subcommand(s)
Options:
-h, --help Print help
-V, --version Print version
ra-multiplex server
can run as a systemd user service, see the example ra-mux.service
.
Configure your editor to use ra-multiplex
as rust-analyzer
, for example for
CoC in neovim edit ~/.config/nvim/coc-settings.json
, add:
{
"rust-analyzer.serverPath": "/path/to/ra-multiplex"
}
If your editor can connect to a language server via TCP you don't need to use
the ra-multiplex
client and connect directly to the server but you need to
provide the same information as the proxy command would. See the
example config for neovim for details.
Configuration is stored in a TOML file in your system's default configuration
directory, for example ~/.config/ra-multiplex/config.toml
. If you're not sure
where that is on your system starting ra-multiplex
without a config file
present will print a notice with the expected path.
Note that the configuration file is likely not necessary and ra-multiplex
should be usable with all defaults.
Example configuration file:
# this is an example configuration file for ra-multiplex
#
# all configuration options here are set to their default value they'll have if
# they're not present in the file or if the config file is missing completely.
# time in seconds after which a rust-analyzer server instance with no clients
# connected will get killed to save system memory.
#
# you can set this option to `false` for infinite timeout
instance_timeout = 300 # after 5 minutes
# time in seconds how long to wait between the gc task checks for disconnected
# clients and possibly starts a timeout task. the value must be at least 1.
gc_interval = 10 # every 10 seconds
# ip address and port on which ra-multiplex-server listens
#
# the default "127.0.0.1" only allows connections from localhost which is
# preferred since the protocol doesn't worry about security.
# ra-multiplex-server expects the filesystem structure and contents to be the
# same on its machine as on ra-multiplex's machine. if you want to run the
# server on a different computer it's theoretically possible but at least for
# now you're on your own.
#
# ports below 1024 will typically require root privileges and should be
# avoided, the default was picked at random, this only needs to change if
# another application happens to collide with ra-multiplex.
listen = ["127.0.0.1", 27631] # localhost & some random unprivileged port
# ip address and port to which ra-multiplex will connect to
#
# this should usually just match the value of `listen`
connect = ["127.0.0.1", 27631] # same as `listen`
# default log filters
#
# RUST_LOG env variable overrides this option, both use the same syntax which
# is documented in the `env_logger` documentation here:
# <https://docs.rs/env_logger/0.9.0/env_logger/index.html#enabling-logging>
log_filters = "info"
By default ra-multiplex
uses a rust-analyzer
binary found in its $PATH
as the server. This can be overridden using the --server-path
cli option with
the client subcommand or RA_MUX_SERVER
environment variable. You can usually
configure one of these in your editor configuration. If both are specified the
cli option overrides the environment variable.
For example with coc-clangd
in CoC for neovim add to
~/.config/nvim/coc-settings.json
:
{
"clangd.path": "/home/user/.cargo/bin/ra-multiplex",
"clangd.arguments": ["client", "--server-path", "/usr/bin/clangd"]
}
Or to set a custom path for rust-analyzer
with coc-rust-analyzer
add to
~/.config/nvim/coc-settings.json
:
{
"rust-analyzer.server.path": "/home/user/.cargo/bin/ra-multiplex",
"rust-analyzer.server.extraEnv": { "RA_MUX_SERVER": "/custom/path/rust-analyzer" }
}
If your editor configuration or plugin doesn't allow to add either you can
instead create a wrapper shell script and set it as the server path directly.
For example if coc-clangd
didn't allow to pass additional arguments you'd
need a script like /usr/local/bin/clangd-proxy
:
#!/bin/sh
RA_MUX_SERVER=/usr/bin/clangd exec /home/user/.cargo/bin/ra-multiplex client --server-path /usr/bin/clangd $@
And configure the editor to use the wrapper script in
~/.config/nvim/coc-settings.json
:
{
"clangd.path": "/usr/local/bin/clangd-proxy"
}