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91 changes: 91 additions & 0 deletions
91
blockchain-patch/apply/privatesky/psknode/core/utils/pingpongFork.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| const PING = "PING"; | ||
| const PONG = "PONG"; | ||
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| module.exports.fork = function pingPongFork(modulePath, args, options){ | ||
| const child_process = require("child_process"); | ||
| const defaultStdio = ["inherit", "inherit", "inherit", "ipc"]; | ||
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| if(!options){ | ||
| options = {stdio: defaultStdio}; | ||
| }else{ | ||
| if(typeof options.stdio === "undefined"){ | ||
| options.stdio = defaultStdio; | ||
| } | ||
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| let stdio = options.stdio; | ||
| if(stdio.length<3){ | ||
| for(let i=stdio.length; i<4; i++){ | ||
| stdio.push("inherit"); | ||
| } | ||
| stdio.push("ipc"); | ||
| } | ||
| } | ||
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| let child = child_process.fork(modulePath, args, options); | ||
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| child.on("message", (message)=>{ | ||
| if(message === PING){ | ||
| child.send(PONG); | ||
| } | ||
| }); | ||
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| return child; | ||
| }; | ||
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| module.exports.enableLifeLine = function(timeout){ | ||
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| if(typeof process.send === "undefined"){ | ||
| console.log("\"process.send\" not found. LifeLine mechanism disabled!"); | ||
| return; | ||
| } | ||
|
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| let lastConfirmationTime; | ||
| const interval = timeout || 10 * 60 * 1000; | ||
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| // this is needed because new Date().getTime() has reduced precision to mitigate timer based attacks | ||
| // for more information see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getTime | ||
| const roundingError = 101; | ||
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| function sendPing(){ | ||
| try { | ||
| process.send(PING); | ||
| } catch (e) { | ||
| //console.log('Parent is not available, shutting down'); | ||
| //exit(1) | ||
| } | ||
| } | ||
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| process.on("message", function (message){ | ||
| if(message === PONG){ | ||
| lastConfirmationTime = new Date().getTime(); | ||
| } | ||
| }); | ||
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| function exit(code){ | ||
| setTimeout(()=>{ | ||
| process.exit(code); | ||
| }, 0); | ||
| } | ||
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| const exceptionEvents = ["SIGINT", "SIGUSR1", "SIGUSR2", "SIGTERM", "SIGHUP"]; | ||
| let killingSignal = false; | ||
| for(let i=0; i<exceptionEvents.length; i++){ | ||
| process.on(exceptionEvents[i], (event, code)=>{ | ||
| killingSignal = true; | ||
| clearInterval(timeoutInterval); | ||
| //console.log(`Caught event type [${exceptionEvents[i]}]. Shutting down...`, code, event); | ||
| //exit(code); | ||
| }); | ||
| } | ||
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| const timeoutInterval = setInterval(function(){ | ||
| const currentTime = new Date().getTime(); | ||
|
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| if(typeof lastConfirmationTime === "undefined" || currentTime - lastConfirmationTime < interval + roundingError && !killingSignal){ | ||
| sendPing(); | ||
| }else{ | ||
| //console.log("Parent process did not answer. Shutting down...", process.argv, killingSignal); | ||
| //exit(1); | ||
| } | ||
| }, interval); | ||
| }; |
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