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https://github.com/matrix-org/dendrite.git
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8bc5084d8d
* p2p: Use JSServer for comms rather than GoJsConn This has several benefits: - it fixes a bug whereby you could not transmit >4k bytes to/from JS/Go land. - it more clearly exposes the interface point between Go and JS: a single global function call. - it presents a nicer API shape than the previous `net.Conn`. - it doesn't needlessly 'stream' data which is already sitting in-memory. This is currently only active for local CS API traffic, another PR will add Federation P2P support. * Typo
79 lines
3 KiB
Markdown
79 lines
3 KiB
Markdown
## Peer-to-peer Matrix
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These are the instructions for setting up P2P Dendrite, current as of March 2020. There's both Go stuff and JS stuff to do to set this up.
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### Dendrite
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- The `master` branch has a WASM-only binary for dendrite: `./cmd/dendritejs`.
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- Build it and copy assets to riot-web.
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```
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$ GOOS=js GOARCH=wasm go build -o main.wasm ./cmd/dendritejs
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$ cp main.wasm ../riot-web/src/vector/dendrite.wasm
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```
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### Rendezvous
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This is how peers discover each other and communicate.
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By default, Dendrite uses the Matrix-hosted websocket star relay server at TODO `/dns4/ws-star.discovery.libp2p.io/tcp/443/wss/p2p-websocket-star`.
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This is currently hard-coded in `./cmd/dendritejs/main.go` - you can also use a local one if you run your own relay:
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```
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$ npm install --global libp2p-websocket-star-rendezvous
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$ rendezvous --port=9090 --host=127.0.0.1
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```
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Then use `/ip4/127.0.0.1/tcp/9090/ws/p2p-websocket-star/`.
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### Riot-web
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You need to check out these repos:
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```
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$ git clone git@github.com:matrix-org/go-http-js-libp2p.git
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$ git clone git@github.com:matrix-org/go-sqlite3-js.git
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```
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Make sure to `yarn install` in both of these repos. Then:
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- `$ cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" ./src/vector/`
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- Comment out the lines in `wasm_exec.js` which contains:
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```
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if (!global.fs && global.require) {
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global.fs = require("fs");
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}
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```
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- Add the diff at https://github.com/vector-im/riot-web/compare/matthew/p2p?expand=1 - ignore the `package.json` stuff.
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- Add the following symlinks: they HAVE to be symlinks as the diff in `webpack.config.js` references specific paths.
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```
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$ cd node_modules
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$ ln -s ../../go-sqlite-js # NB: NOT go-sqlite3-js
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$ ln -s ../../go-http-js-libp2p
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```
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NB: If you don't run the server with `yarn start` you need to make sure your server is sending the header `Service-Worker-Allowed: /`.
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TODO: Make a Docker image with all of this in it and a volume mount for `dendrite.wasm`.
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### Running
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You need a Chrome and a Firefox running to test locally as service workers don't work in incognito tabs.
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- For Chrome, use `chrome://serviceworker-internals/` to unregister/see logs.
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- For Firefox, use `about:debugging#/runtime/this-firefox` to unregister. Use the console window to see logs.
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Assuming you've `yarn start`ed Riot-Web, go to `http://localhost:8080` and register with `http://localhost:8080` as your HS URL.
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You can join rooms by room alias e.g `/join #foo:bar`.
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### Known issues
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- When registering you may be unable to find the server, it'll seem flakey. This happens because the SW, particularly in Firefox,
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gets killed after 30s of inactivity. When you are not registered, you aren't doing `/sync` calls to keep the SW alive, so if you
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don't register for a while and idle on the page, the HS will disappear. To fix, unregister the SW, and then refresh the page.
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- The libp2p layer has rate limits, so frequent Federation traffic may cause the connection to drop and messages to not be transferred.
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I guess in other words, don't send too much traffic?
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