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feat: Internalise graceful shutdown handling
- Use the `onClose` hook as handlers - Allow other signal listeners to run in parallel - Add options
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| // Based on `fastify-graceful-shutdown`, with some tweaks: | ||
| // - allow external signal handlers to be registered | ||
| // - don't use specific handlers, use Fastify's `onClose` hooks. | ||
| // - await async onClose hooks | ||
| // - add some options | ||
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| import { FastifyPluginAsync } from 'fastify' | ||
| import fp from 'fastify-plugin' | ||
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| export interface GracefulShutdownOptions { | ||
| /** | ||
| * A list of signals to listen to and trigger | ||
| * a graceful shutdown when received. | ||
| * | ||
| * Defaults to `["SIGINT", "SIGTERM"]`. | ||
| */ | ||
| signals?: string[] | ||
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| /** | ||
| * How long to wait (in ms) for the signal handlers | ||
| * to resolve before doing a hard exit to kill | ||
| * the process with `process.exit()` | ||
| * | ||
| * Defaults to 10 seconds. | ||
| */ | ||
| timeoutMs?: number | ||
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| /** | ||
| * The exit code to use when hard-exiting after | ||
| * the timeout has expired. | ||
| * | ||
| * Defaults to 1. | ||
| */ | ||
| hardExitCode?: number | ||
| } | ||
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| export const defaultGracefulShutdownOptions: Required<GracefulShutdownOptions> = | ||
| { | ||
| signals: ['SIGINT', 'SIGTERM'], | ||
| timeoutMs: 10_000, | ||
| hardExitCode: 1 | ||
| } | ||
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| const gracefulShutdownPlugin: FastifyPluginAsync<GracefulShutdownOptions> = | ||
| async function gracefulShutdownPlugin(fastify, userOptions = {}) { | ||
| const logger = fastify.log.child({ | ||
| plugin: 'fastify-micro:graceful-shutdown' | ||
| }) | ||
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| const options = { | ||
| ...defaultGracefulShutdownOptions, | ||
| ...userOptions | ||
| } | ||
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| options.signals.forEach(signal => { | ||
| process.once(signal, () => { | ||
| logger.info({ signal }, 'Received signal') | ||
| const timeout = setTimeout(() => { | ||
| logger.fatal({ signal }, 'Hard-exiting the process after timeout') | ||
| process.exit(options.hardExitCode) | ||
| }, options.timeoutMs) | ||
| fastify.close().then( | ||
| () => { | ||
| clearTimeout(timeout) | ||
| logger.info({ signal }, 'Process terminated') | ||
| process.exit(0) | ||
| }, | ||
| error => { | ||
| logger.error( | ||
| { signal, error }, | ||
| 'Process terminated with error on `onClose` hook' | ||
| ) | ||
| process.exit(1) | ||
| } | ||
| ) | ||
| }) | ||
| }) | ||
| } | ||
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| export default fp(gracefulShutdownPlugin, { | ||
| fastify: '3.x', | ||
| name: 'fastify-micro:graceful-shutdown' | ||
| }) |
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