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Change process option 'name' to 'id'. Add option 'overrun'. Add option 'timeout'. Refactor process status tracking.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -6,7 +6,7 @@ | |
| "autostart": true, | ||
| "restart": "always", | ||
| "maxRestarts": 3, | ||
| "restartDelayMs": 1000 | ||
| "restartDelayMs": 3000 | ||
| } | ||
| ] | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| console.log("I will restart forever") | ||
| console.log("My process id is ", Deno.env.get("PUP_PROCESS_ID")); | ||
| console.log("My process id is ", Deno.env.get("PUP_PROCESS_ID")) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,209 @@ | ||
| import { Pup } from "./pup.ts" | ||
| import { Cron } from "../../deps.ts" | ||
| import { Runner } from "./runner.ts" | ||
| import { ProcessConfiguration } from "./configuration.ts" | ||
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| enum ProcessStatus { | ||
| CREATED = 0, | ||
| STARTING = 100, | ||
| RUNNING = 200, | ||
| STOPPING = 250, | ||
| FINISHED = 300, | ||
| ERRORED = 400, | ||
| EXHAUSTED = 450, | ||
| BLOCKED = 500, | ||
| } | ||
|
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| interface ProcessInformation { | ||
| id: string | ||
| status: ProcessStatus | ||
| code?: number | ||
| signal?: number | ||
| pid?: number | ||
| started?: Date | ||
| exited?: Date | ||
| blocked?: boolean | ||
| restarts?: number | ||
| updated: Date | ||
| } | ||
|
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||
| interface ProcessInformationParsed { | ||
| id: string | ||
| status: ProcessStatus | ||
| code?: number | ||
| signal?: number | ||
| pid?: number | ||
| started?: string | ||
| exited?: string | ||
| blocked?: boolean | ||
| restarts?: number | ||
| updated: string | ||
| } | ||
|
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| class Process { | ||
| private readonly config: ProcessConfiguration | ||
| private readonly pup: Pup | ||
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| // Subprocess runner | ||
| private runner?: Runner | ||
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| // Allow manual block | ||
| private blocked = false | ||
|
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| // Status | ||
| private status: ProcessStatus = ProcessStatus.CREATED | ||
| private pid?: number | ||
| private code?: number | ||
| private signal?: number | ||
| private started?: Date | ||
| private exited?: Date | ||
| private restarts = 0 | ||
| private updated: Date = new Date() | ||
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| constructor(pup: Pup, config: ProcessConfiguration) { | ||
| this.config = config | ||
| this.pup = pup | ||
| } | ||
|
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| private setStatus(s: ProcessStatus) { | ||
| this.status = s | ||
| this.updated = new Date() | ||
| } | ||
|
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| public getStatus(): ProcessInformation { | ||
| return { | ||
| id: this.config.id, | ||
| status: this.status, | ||
| pid: this.pid, | ||
| code: this.code, | ||
| signal: this.signal, | ||
| started: this.started, | ||
| exited: this.exited, | ||
| blocked: this.blocked, | ||
| restarts: this.restarts, | ||
| updated: this.updated, | ||
| } | ||
| } | ||
|
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| public getConfig() { | ||
| return this.config | ||
| } | ||
|
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| public init = () => { | ||
| // Start using cron pattern | ||
| if (this.config.cron) this.setupCron() | ||
| } | ||
|
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| public start = async (reason?: string, restart?: boolean) => { | ||
| const logger = this.pup.logger | ||
|
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| // Do not start if blocked | ||
| if (this.blocked) { | ||
| logger.log("blocked", `Process blocked, refusing to start`, this.config) | ||
| return | ||
| } | ||
|
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| // Do not start if running and overrun isn't enabled | ||
| if (this.status === ProcessStatus.RUNNING && !this.config.overrun) { | ||
| logger.log("blocked", `Process still running, refusing to start`, this.config) | ||
| return | ||
| } | ||
|
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| // Do not restart if maximum number of restarts are exhausted | ||
| if (this.restarts >= (this.config.maxRestarts ?? Infinity)) { | ||
| logger.log("exhausted", `Maximum number of starts exhausted, refusing to start`, this.config) | ||
| this.setStatus(ProcessStatus.EXHAUSTED) | ||
| return | ||
| } | ||
|
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| logger.log("starting", `Process starting, reason: ${reason}`, this.config) | ||
|
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| // Update status | ||
| this.setStatus(ProcessStatus.STARTING) | ||
| this.pid = undefined | ||
| this.code = undefined | ||
| this.signal = undefined | ||
| this.exited = undefined | ||
| this.started = undefined | ||
|
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| // Start process (await for it to exit) | ||
| this.runner = new Runner(this.pup, this.config) | ||
|
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| // Update restart counter, this is reset on successful exit, or manual .stop() | ||
| if (restart) { | ||
| this.restarts = this.restarts + 1 | ||
| } | ||
|
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| // Try to start | ||
| try { | ||
| const result = await this.runner.run((pid: number) => { | ||
| // Process started | ||
| this.setStatus(ProcessStatus.RUNNING) | ||
| this.pid = pid | ||
| this.started = new Date() | ||
| }) | ||
|
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| this.code = result.code | ||
| this.signal = result.signal | ||
|
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| // Exited - Update status | ||
| if (result.code === 0) { | ||
| // Reset restarts on successful exit | ||
| this.setStatus(ProcessStatus.FINISHED) | ||
| logger.log("finished", `Process finished with code ${result.code}`, this.config) | ||
| } else { | ||
| this.setStatus(ProcessStatus.ERRORED) | ||
| logger.log("errored", `Process exited with code ${result.code}`, this.config) | ||
| } | ||
| } catch (e) { | ||
| this.code = undefined | ||
| this.signal = undefined | ||
| this.setStatus(ProcessStatus.ERRORED) | ||
| logger.log("errored", `Process could not start, error: ${e}`, this.config) | ||
| } | ||
|
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| this.exited = new Date() | ||
| this.pid = undefined | ||
| this.runner = undefined | ||
| } | ||
|
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| public stop = (reason: string): boolean => { | ||
| if (this.runner) { | ||
| try { | ||
| this.pup.logger.log("starting", `Killing process, reason: ${reason}`, this.config) | ||
| this.runner?.kill("SIGINT") | ||
| this.restarts = 0 | ||
| return true | ||
| } catch (_e) { | ||
| return false | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
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||
| public block = () => { | ||
| this.blocked = true | ||
| } | ||
|
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| public unblock = () => { | ||
| this.blocked = false | ||
| } | ||
|
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| private setupCron = () => { | ||
| try { | ||
| // ToDo: Take care of env TZ? | ||
| const cronJob = new Cron(this.config.cron as string, () => { | ||
| this.start("Cron pattern") | ||
| this.pup.logger.log("scheduler", `${this.config.id} is scheduled to run at '${this.config.cron} (${cronJob.nextRun()?.toLocaleString()})'`) | ||
| }) | ||
|
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| // Initial next run time | ||
| this.pup.logger.log("scheduler", `${this.config.id} is scheduled to run at '${this.config.cron} (${cronJob.nextRun()?.toLocaleString()})'`) | ||
| } catch (e) { | ||
| this.pup.logger.error("scheduled", `Fatal error setup up the cron job for '${this.config.id}', process will not autostart. Error: ${e}`) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| export { Process, ProcessStatus } | ||
| export type { ProcessInformation, ProcessInformationParsed } |
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