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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| 'use strict' | ||
|
|
||
| class Topology { | ||
| /** | ||
| * @param {Object} props | ||
| * @param {number} props.min minimum needed connections (default: 0) | ||
| * @param {number} props.max maximum needed connections (default: Infinity) | ||
| * @param {function} props.onConnect protocol "onConnect" handler | ||
| * @param {function} props.onDisconnect protocol "onDisconnect" handler | ||
| * @param {Array<string>} props.multicodecs protocol multicodecs | ||
| * @param {Registrar} registrar | ||
| * @constructor | ||
| */ | ||
| constructor ({ | ||
| min = 0, | ||
| max = Infinity, | ||
| onConnect, | ||
| onDisconnect, | ||
| multicodecs, | ||
| registrar | ||
| }) { | ||
| this.multicodecs = multicodecs | ||
| this.registrar = registrar | ||
| this.min = min | ||
| this.max = max | ||
| this.peers = new Map() | ||
|
|
||
| // Handlers | ||
| this._onConnect = onConnect | ||
| this._onDisconnect = onDisconnect | ||
|
|
||
| this._onProtocolChange = this._onProtocolChange.bind(this) | ||
|
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| // Set by the registrar | ||
| this._peerStore = null | ||
| } | ||
|
|
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| /** | ||
| * Set peerstore to the topology. | ||
| * @param {PeerStore} peerStore | ||
| */ | ||
| set peerStore (peerStore) { | ||
| this._peerStore = peerStore | ||
|
|
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| this._peerStore.on('change:protocols', this._onProtocolChange) | ||
| } | ||
|
|
||
| /** | ||
| * Try to add a connected peer to the topology, if inside the thresholds. | ||
| * @param {PeerInfo} peerInfo | ||
| * @param {Connection} connection | ||
| * @returns {void} | ||
| */ | ||
| tryToConnect (peerInfo, connection) { | ||
| // TODO: conn manager should validate if it should try to connect | ||
|
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| this._onConnect(peerInfo, connection) | ||
|
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| this.peers.set(peerInfo.id.toB58String(), peerInfo) | ||
| } | ||
|
|
||
| /** | ||
| * Notify protocol of peer disconnected. | ||
| * @param {PeerInfo} peerInfo | ||
| * @param {Error} [error] | ||
| * @returns {void} | ||
| */ | ||
| disconnect (peerInfo, error) { | ||
| if (this.peers.delete(peerInfo.id.toB58String())) { | ||
| this._onDisconnect(peerInfo, error) | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Check if a new peer support the multicodecs for this topology. | ||
| * @param {Object} props | ||
| * @param {PeerInfo} props.peerInfo | ||
| * @param {Array<string>} props.protocols | ||
| */ | ||
| _onProtocolChange ({ peerInfo, protocols }) { | ||
| const existingPeer = this.peers.get(peerInfo.id.toB58String()) | ||
|
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| protocols.filter(protocol => this.multicodecs.includes(protocol)) | ||
|
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| // Not supporting the protocol anymore? | ||
| if (existingPeer && protocols.filter(protocol => this.multicodecs.includes(protocol)).length === 0) { | ||
| this._onDisconnect({ | ||
| peerInfo | ||
| }) | ||
| } | ||
|
|
||
| // New to protocol support | ||
| for (const protocol of protocols) { | ||
| if (this.multicodecs.includes(protocol)) { | ||
| this.tryToConnect(peerInfo, this.registrar.getPeerConnection(peerInfo)) | ||
| return | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| module.exports = Topology |
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