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Merge pull request #154 from ChainSafe/mikerah/libp2p_integration
[WIP] Integrating libp2p into Lodestar
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import {PeerBook} from "peer-book"; | ||
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export default { | ||
maxPeers: 25, | ||
refreshInterval: 15000, | ||
peerBook: new PeerBook(), | ||
bootnodes: [] | ||
}; |
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@@ -1,13 +1,149 @@ | ||
import {EventEmitter} from "events"; | ||
import {Service} from "../node"; | ||
import {LodestarNode} from "./node"; | ||
import logger, {AbstractLogger} from "../logger"; | ||
import {PeerInfo} from "peer-info"; | ||
import LibP2p from "libp2p"; | ||
import {PeerBook} from "peer-book"; | ||
import {PeerId} from "peer-id"; | ||
import {promisify} from "promisify-es6"; | ||
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export interface P2pOptions { | ||
maxPeers: number; | ||
refreshInterval: number; | ||
peerBook: PeerBook; | ||
privateKey: Buffer; | ||
bootnodes: string[]; | ||
} | ||
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/** | ||
* The P2PNetwork service manages p2p connection/subscription objects | ||
*/ | ||
export class P2PNetwork extends EventEmitter { | ||
public constructor(opts) { | ||
export class P2PNetwork extends EventEmitter implements Service { | ||
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private options: P2pOptions; | ||
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private maxPeers: number; | ||
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private refreshInterval: number; | ||
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private peerBook: PeerBook; | ||
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private privateKey: Buffer; | ||
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private bootnodes: string[]; | ||
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private started: boolean; | ||
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private node: LibP2p; | ||
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private discoveredPeers: Set<PeerInfo>; | ||
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private log: AbstractLogger; | ||
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public constructor(opts: P2pOptions) { | ||
super(); | ||
// build gossipsub object | ||
this.options = opts; | ||
this.maxPeers = this.options.maxPeers; | ||
this.refreshInterval = this.options.refreshInterval; | ||
this.peerBook = this.options.peerBook; | ||
this.privateKey = this.options.privateKey; | ||
this.bootnodes = this.options.bootnodes; | ||
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this.started = false; | ||
this.node = null; | ||
this.discoveredPeers = new Set(); | ||
this.log = logger; | ||
} | ||
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public get isRunning(): boolean { | ||
return this.started; | ||
} | ||
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public async start(): Promise<void> { | ||
if (this.started) { | ||
throw new Error("P2P Network already started"); | ||
} | ||
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if (!this.node) { | ||
this.node = LodestarNode.createNode({ | ||
peerInfo: await this.createPeerInfo(), | ||
bootnodes: this.options.bootnodes | ||
}); | ||
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this.node.on('peer:discovery', (peerInfo) => { | ||
try { | ||
const peerId = peerInfo.id.toB58String(); | ||
// Check if peer has already been discovered | ||
if (this.options.peerBook.has(peerId) || this.discoveredPeers.has(peerId)) { | ||
return; | ||
} | ||
this.peerBook.put(peerInfo); | ||
this.node.dial(peerInfo, () => {}); | ||
this.log.info(`Peer discovered: ${peerInfo}`); | ||
this.emit('connected', peerInfo); | ||
} catch (err) { | ||
this.log.error(err); | ||
} | ||
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}); | ||
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this.node.on('peer:connect', (peerInfo) => { | ||
try { | ||
this.log.info(`Peer connected: ${peerInfo}`); | ||
this.peerBook.put(peerInfo); | ||
this.discoveredPeers.add(peerInfo); | ||
} catch (err) { | ||
this.log.error(err); | ||
} | ||
}); | ||
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this.node.on('peer:disconnect', (peerInfo) => { | ||
try { | ||
this.peerBook.remove(peerInfo); | ||
this.discoveredPeers.delete(peerInfo); | ||
} catch (err) { | ||
this.log.error(err); | ||
} | ||
}); | ||
} | ||
await promisify(this.node.start.bind(this.node))(); | ||
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this.started = true; | ||
} | ||
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public async stop(): Promise<void> { | ||
if (!this.started) { | ||
return; | ||
} | ||
this.node.removeAllListeners(); | ||
await promisify(this.node.stop.bind(this.node))(); | ||
} | ||
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private async createPeerInfo(): PeerInfo { | ||
return new Promise((resolve, reject) => { | ||
const handler = (err, peerInfo) => { | ||
if (err) { | ||
return reject(err); | ||
} | ||
this.peerBook.getAll().forEach((peer) => { | ||
peer.multiaddrs.forEach((multiaddr) => { | ||
peerInfo.multiaddrs.add(multiaddr); | ||
resolve(peerInfo); | ||
}); | ||
}); | ||
}; | ||
if (this.privateKey) { | ||
PeerId.createFromPrivKey(this.privateKey, (err, id) => { | ||
if (err) { | ||
return reject(err); | ||
} | ||
PeerInfo.create(id, handler); | ||
}); | ||
} else { | ||
PeerInfo.create(handler); | ||
} | ||
}); | ||
} | ||
public async start() {} | ||
public async stop() {} | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,60 @@ | ||
import LibP2p from "libp2p"; | ||
import {TCP} from "libp2p-tcp"; | ||
import {Mplex} from "libp2p-mplex"; | ||
import {Bootstrap} from "libp2p-bootstrap"; | ||
import {promisify} from "es6-promisify"; | ||
import {PeerInfo} from "peer-info"; | ||
import {PeerId} from "peer-id"; | ||
import {defaultsDeep} from "@nodeutils/defaults-deep"; | ||
import * as FloodSub from "libp2p-floodsub"; | ||
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export interface LodestarNodeOpts { | ||
bootstrap?: string[]; | ||
peerInfo: PeerInfo; | ||
bootnodes?: string[]; | ||
} | ||
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export class LodestarNode extends LibP2p { | ||
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private pubsub: FloodSub; | ||
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private constructor(_options: LodestarNodeOpts) { | ||
const defaults = { | ||
modules: { | ||
transport: [TCP], | ||
streamMuxer: [Mplex], | ||
peerDiscovery: [Bootstrap] | ||
}, | ||
config: { | ||
peerDiscovery: { | ||
bootstrap: { | ||
interval: 2000, | ||
enabled: true, | ||
list: _options.bootstrap || [] | ||
} | ||
} | ||
} | ||
}; | ||
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super(defaultsDeep(_options, defaults)); | ||
} | ||
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public static createNode(callback): LodestarNode { | ||
const id = promisify(PeerId.create)({bits: 1024}); | ||
const peerInfo = promisify(PeerInfo.create)(id); | ||
peerInfo.multiaddrs.add('ip4/0.0.0.0/tcp/9000'); | ||
const node = new LodestarNode({ | ||
peerInfo | ||
}); | ||
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node.pubsub = new FloodSub(node); | ||
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return node; | ||
} | ||
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public async start(): Promise<void> { | ||
await promisify(super.start.bind(this))(); | ||
await promisify(this.pubsub.start.bind(this.pubsub))(); | ||
} | ||
} | ||
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