58 lines
1.6 KiB
JavaScript
58 lines
1.6 KiB
JavaScript
const HttpStatus = require("http-status-codes");
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const { sum, sumBy } = require("lodash");
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const db = require("./db");
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// getStatus returns the server's current health check status
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function getStatus() {
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// Grab entry element from DB
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const entry = db.get("entries").orderBy("date", "desc").head().value();
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// Check that every critical check entry is up
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if (entry && entry.checks.every(({ up, critical }) => up && critical)) {
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return HttpStatus.OK;
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}
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// At least one check failed
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return HttpStatus.SERVICE_UNAVAILABLE;
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}
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// getTimeout returns the average time out from a sample of 10 health check
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// entries.
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function getTimeout() {
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// Check status of the Health Check
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if (getStatus() === HttpStatus.SERVICE_UNAVAILABLE) {
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return 0;
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}
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// Grab 10 entries from the database as a sample to determine the average
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// timeout for the server.
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const sample = db
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.get("entries")
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.orderBy("date", "desc")
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.filter(({ checks }) => checks.every(({ up, critical }) => up && critical))
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.take(10)
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.value();
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// Return average timeout
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return Math.round(sum(sample.map(({ checks }) => sumBy(checks, "time"))) / sample.size);
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}
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// getEntriesSinceYesterday gets the health check entries since yesterday
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function getEntriesSinceYesterday() {
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const yesterday = new Date();
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yesterday.setDate(yesterday.getDate() - 1);
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return db
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.get("entries")
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.orderBy("date", "desc")
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.filter(({ date }) => date >= yesterday.toISOString())
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.value();
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}
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module.exports = (req, res) => {
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setTimeout(() => {
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res.status(getStatus()).send(getEntriesSinceYesterday());
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}, getTimeout());
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};
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