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feat: compatibility with go-libp2p-mdns - option 2#81
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This PR adds a compatibility class that allows a js-libp2p node to find a go-libp2p node (and vice versa) over MDNS.
It's implemented as a separate class so the two differing implementations do not get confused.
I've verified this is working correctly by running a go-ipfs and js-ipfs node with no boostrap nodes (and no other discovery methods) and verifying they find each other.
TODO:
* [ ] Add tests!
Some tips if you want to try this out:
* After you've run `ipfs init`, remember to remove the bootstrap nodes from the config file (`~/.ipfs/config`) of each node before you start up
* Use `ipfs log level mdns debug` for some go-ipfs mdns logs
* You can use the following script (after `npm link`ing this branch) to start a js-ipfs node with no bootstrap nodes and no discovery modules other than MDNS:
```js
const IPFS = require('ipfs')
const MDNS = require('libp2p-mdns')
const TCP = require('libp2p-tcp')
const ipfs = new IPFS({
repo: '/tmp/ipfs-mdns',
config: {
Bootstrap: []
},
libp2p: {
modules: {
peerDiscovery: [MDNS],
transport: [TCP]
}
}
})
ipfs.on('ready', async () => {
console.log('ipfs is ready')
console.log('My Peer ID:', (await ipfs.id()).id)
setInterval(async () => {
const peers = await ipfs.swarm.peers()
console.log(peers.length, 'peers:')
peers.forEach(p => console.log(p.peer.toB58String()))
}, 10000)
})
```
License: MIT
Signed-off-by: Alan Shaw <alan.shaw@protocol.ai>
License: MIT Signed-off-by: Alan Shaw <alan.shaw@protocol.ai>
License: MIT Signed-off-by: Alan Shaw <alan.shaw@protocol.ai>
Co-Authored-By: alanshaw <alan.shaw@protocol.ai>
License: MIT Signed-off-by: Alan Shaw <alan@tableflip.io>
License: MIT Signed-off-by: Alan Shaw <alan@tableflip.io>
License: MIT Signed-off-by: Alan Shaw <alan@tableflip.io>
License: MIT Signed-off-by: Alan Shaw <alan@tableflip.io>
License: MIT Signed-off-by: Alan Shaw <alan@tableflip.io>
License: MIT Signed-off-by: Alan Shaw <alan@tableflip.io>
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License: MIT Signed-off-by: Alan Shaw <alan@tableflip.io>
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This PR simply sends out a multicast "response" on an interval in a format that
go-libp2p-mdnsexpects. This works becausego-libp2psends a multicast query every 5 seconds and waits for responses to come in. Although they ideally should be sent unicast,go-libp2pstill accepts multicast responses.Note this allows
go-libp2pto discoverjs-libp2pnodes but not the other way around.