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Fix: Docker Healthcheck is not happy during migration (louislam#5258)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| const express = require("express"); | ||
| const http = require("node:http"); | ||
| const { log } = require("../../src/util"); | ||
|
|
||
| /** | ||
| * SimpleMigrationServer | ||
| * For displaying the migration status of the server | ||
| * Also, it is used to let Docker healthcheck know the status of the server, as the main server is not started yet, healthcheck will think the server is down incorrectly. | ||
| */ | ||
| class SimpleMigrationServer { | ||
| /** | ||
| * Express app instance | ||
| * @type {?Express} | ||
| */ | ||
| app; | ||
|
|
||
| /** | ||
| * Server instance | ||
| * @type {?Server} | ||
| */ | ||
| server; | ||
|
|
||
| /** | ||
| * Response object | ||
| * @type {?Response} | ||
| */ | ||
| response; | ||
|
|
||
| /** | ||
| * Start the server | ||
| * @param {number} port Port | ||
| * @param {string} hostname Hostname | ||
| * @returns {Promise<void>} | ||
| */ | ||
| start(port, hostname) { | ||
| this.app = express(); | ||
| this.server = http.createServer(this.app); | ||
|
|
||
| this.app.get("/", (req, res) => { | ||
| res.set("Content-Type", "text/plain"); | ||
| res.write("Migration is in progress, listening message...\n"); | ||
| if (this.response) { | ||
| this.response.write("Disconnected\n"); | ||
| this.response.end(); | ||
| } | ||
| this.response = res; | ||
| // never ending response | ||
| }); | ||
|
|
||
| return new Promise((resolve) => { | ||
| this.server.listen(port, hostname, () => { | ||
| if (hostname) { | ||
| log.info("migration", `Migration server is running on http://${hostname}:${port}`); | ||
| } else { | ||
| log.info("migration", `Migration server is running on http://localhost:${port}`); | ||
| } | ||
| resolve(); | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Update the message | ||
| * @param {string} msg Message to update | ||
| * @returns {void} | ||
| */ | ||
| update(msg) { | ||
| this.response?.write(msg + "\n"); | ||
| } | ||
|
|
||
| /** | ||
| * Stop the server | ||
| * @returns {Promise<void>} | ||
| */ | ||
| async stop() { | ||
| this.response?.write("Finished, please refresh this page.\n"); | ||
| this.response?.end(); | ||
| await this.server?.close(); | ||
| } | ||
| } | ||
|
|
||
| module.exports = { | ||
| SimpleMigrationServer, | ||
| }; |