MTS/yjs-backend
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implement connection-close & connecton-error event and add parameter for exponential backoff

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This commit is contained in:
Kevin Jahns 2022-03-21 13:07:11 +01:00
parent eb53b555f1
commit 4c4b244c0e
2 changed files with 3218 additions and 219 deletions
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18
src/y-websocket.js
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@ -53,8 +53,6 @@ messageHandlers[messageAuth] = (encoder, decoder, provider, emitSynced, messageT
authProtocol.readAuthMessage(decoder, provider.doc, permissionDeniedHandler)
}
const reconnectTimeoutBase = 1200
const maxReconnectTimeout = 2500
// @todo - this should depend on awareness.outdatedTime
const messageReconnectTimeout = 30000
@ -102,7 +100,11 @@ const setupWS = provider => {
websocket.send(encoding.toUint8Array(encoder))
}
}
websocket.onclose = () => {
websocket.onerror = event => {
provider.emit('connection-error', [event, provider])
}
websocket.onclose = event => {
provider.emit('connection-close', [event, provider])
provider.ws = null
provider.wsconnecting = false
if (provider.wsconnected) {
@ -117,10 +119,8 @@ const setupWS = provider => {
provider.wsUnsuccessfulReconnects++
}
// Start with no reconnect timeout and increase timeout by
// log10(wsUnsuccessfulReconnects).
// The idea is to increase reconnect timeout slowly and have no reconnect
// timeout at the beginning (log(1) = 0)
setTimeout(setupWS, math.min(math.log10(provider.wsUnsuccessfulReconnects + 1) * reconnectTimeoutBase, maxReconnectTimeout), provider)
// using exponential backoff starting with 100ms
setTimeout(setupWS, math.min(math.pow(2, provider.wsUnsuccessfulReconnects) * 100, provider.maxBackoffTime), provider)
}
websocket.onopen = () => {
provider.wsLastMessageReceived = time.getUnixTime()
@ -189,14 +189,16 @@ export class WebsocketProvider extends Observable {
* @param {Object<string,string>} [opts.params]
* @param {typeof WebSocket} [opts.WebSocketPolyfill] Optionall provide a WebSocket polyfill
* @param {number} [opts.resyncInterval] Request server state every `resyncInterval` milliseconds
* @param {number} [opts.maxBackoffTime] Maximum amount of time to wait before trying to reconnect (we try to reconnect using exponential backoff)
*/
constructor (serverUrl, roomname, doc, { connect = true, awareness = new awarenessProtocol.Awareness(doc), params = {}, WebSocketPolyfill = WebSocket, resyncInterval = -1 } = {}) {
constructor (serverUrl, roomname, doc, { connect = true, awareness = new awarenessProtocol.Awareness(doc), params = {}, WebSocketPolyfill = WebSocket, resyncInterval = -1, maxBackoffTime = 2500 } = {}) {
super()
// ensure that url is always ends with /
while (serverUrl[serverUrl.length - 1] === '/') {
serverUrl = serverUrl.slice(0, serverUrl.length - 1)
}
const encodedParams = url.encodeQueryParams(params)
this.maxBackoffTime = maxBackoffTime
this.bcChannel = serverUrl + '/' + roomname
this.url = serverUrl + '/' + roomname + (encodedParams.length === 0 ? '' : '?' + encodedParams)
this.roomname = roomname