TheRealToxicDev revised this gist . Go to revision
1 file changed, 62 insertions
uptime.js(file created)
| @@ -0,0 +1,62 @@ | |||
| 1 | + | private _fetchURL() { | |
| 2 | + | const startPing: number = Date.now(); | |
| 3 | + | const timeout: Promise<Error> = new Promise((_, reject) => { | |
| 4 | + | setTimeout(() => { | |
| 5 | + | reject(new Error('timeout')) | |
| 6 | + | }, this.timeout); | |
| 7 | + | }); | |
| 8 | + | ||
| 9 | + | const fetchFunction = new Promise((resolve, reject) => { | |
| 10 | + | fetch(this.url, { headers: this.headers }) | |
| 11 | + | .then((res) => { | |
| 12 | + | resolve({ | |
| 13 | + | statusCode: res.status, | |
| 14 | + | statusText: res.statusText, | |
| 15 | + | ping: Date.now() - startPing | |
| 16 | + | }) | |
| 17 | + | }) | |
| 18 | + | .catch((e) => reject(e)); | |
| 19 | + | }); | |
| 20 | + | ||
| 21 | + | Promise.race([fetchFunction, timeout]) | |
| 22 | + | .then((result: any) => { | |
| 23 | + | this.ping = result.ping; | |
| 24 | + | ||
| 25 | + | if (result.statusCode > 299) { | |
| 26 | + | this.failures++; | |
| 27 | + | log.error(`[@infinitylist/uptime]: monitor failure: ${this.failures}`); | |
| 28 | + | ||
| 29 | + | if (this.failures > this.retries) { | |
| 30 | + | this._emitOutage(result.statusCode, result.statusText); | |
| 31 | + | } | |
| 32 | + | } else { | |
| 33 | + | ||
| 34 | + | this.failures = 0; | |
| 35 | + | this.available = true; | |
| 36 | + | this.uptime = Date.now() - this.startTime; | |
| 37 | + | this.lastSuccessCheck = Date.now(); | |
| 38 | + | ||
| 39 | + | this._emitUp(result.statusCode, result.statusText) | |
| 40 | + | } | |
| 41 | + | }) | |
| 42 | + | .catch((e) => { | |
| 43 | + | ||
| 44 | + | if (e.message.match('timeout')) { | |
| 45 | + | ||
| 46 | + | this.failures ++; | |
| 47 | + | log.error(`[@infinitylist/uptime]: monitor failure: ${this.failures}`); | |
| 48 | + | ||
| 49 | + | if (this.failures > this.retries) { | |
| 50 | + | this._emitOutage(undefined, 'timeout'); | |
| 51 | + | } | |
| 52 | + | } | |
| 53 | + | ||
| 54 | + | else { | |
| 55 | + | ||
| 56 | + | if (e.message.match('Only absolute URLs are supported')) return this.emit('error', TypeError('[@infinitylist/uptime]: only absolute urls are supported')); | |
| 57 | + | if (e.message.match('ECONNREFUSED')) return this.emit('error', TypeError(`[@infinitylist/client]: unknown host: ${this.url} connection refused`)); | |
| 58 | + | ||
| 59 | + | this.emit('error', e); | |
| 60 | + | } | |
| 61 | + | }) | |
| 62 | + | } | |
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