greenlock-express.js/worker.js

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"use strict";
var Worker = module.exports;
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// *very* generous, but well below the http norm of 120
var messageTimeout = 30 * 1000;
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var msgPrefix = "greenlock:";
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Worker.create = function() {
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var greenlock = {};
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["getAcmeHttp01ChallengeResponse", "get", "notify", "_notify"].forEach(function(k) {
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greenlock[k] = function(args) {
return rpc(k, args);
};
});
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var worker = {
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ready: function(fn) {
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var servers = require("./servers.js").create(greenlock);
fn(servers);
return worker;
},
master: function() {
// ignore
return worker;
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},
serve: function(fn) {
// keeping backwards compat
if (1 === fn.length) {
worker.ready(fn);
return;
}
// serving the express app, right away
worker.ready(function(glx) {
glx.serveApp(fn);
});
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}
};
return worker;
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};
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function rpc(funcname, msg) {
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return new Promise(function(resolve, reject) {
var rnd = Math.random()
.toString()
.slice(2)
.toString(16);
var id = msgPrefix + rnd;
var timeout;
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function getResponse(msg) {
if (msg._id !== id) {
return;
}
process.removeListener("message", getResponse);
clearTimeout(timeout);
resolve(msg._result);
}
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// TODO keep a single listener than just responds
// via a collection of callbacks? or leave as is?
process.on("message", getResponse);
process.send({
_id: id,
_funcname: funcname,
_input: msg
});
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timeout = setTimeout(function() {
process.removeListener("message", getResponse);
reject(new Error("worker rpc request timeout"));
}, messageTimeout);
});
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}