49 lines
1.3 KiB
TypeScript
49 lines
1.3 KiB
TypeScript
import { logger } from "@coder/logger"
|
|
import { promises as fs } from "fs"
|
|
|
|
/**
|
|
* Provides a heartbeat using a local file to indicate activity.
|
|
*/
|
|
export class Heart {
|
|
private heartbeatTimer?: NodeJS.Timeout
|
|
private heartbeatInterval = 60000
|
|
public lastHeartbeat = 0
|
|
|
|
public constructor(private readonly heartbeatPath: string, private readonly isActive: () => Promise<boolean>) {}
|
|
|
|
public alive(): boolean {
|
|
const now = Date.now()
|
|
return now - this.lastHeartbeat < this.heartbeatInterval
|
|
}
|
|
/**
|
|
* Write to the heartbeat file if we haven't already done so within the
|
|
* timeout and start or reset a timer that keeps running as long as there is
|
|
* activity. Failures are logged as warnings.
|
|
*/
|
|
public beat(): void {
|
|
if (this.alive()) {
|
|
return
|
|
}
|
|
|
|
logger.trace("heartbeat")
|
|
fs.writeFile(this.heartbeatPath, "").catch((error) => {
|
|
logger.warn(error.message)
|
|
})
|
|
this.lastHeartbeat = Date.now()
|
|
if (typeof this.heartbeatTimer !== "undefined") {
|
|
clearTimeout(this.heartbeatTimer)
|
|
}
|
|
this.heartbeatTimer = setTimeout(() => {
|
|
this.isActive()
|
|
.then((active) => {
|
|
if (active) {
|
|
this.beat()
|
|
}
|
|
})
|
|
.catch((error) => {
|
|
logger.warn(error.message)
|
|
})
|
|
}, this.heartbeatInterval)
|
|
}
|
|
}
|