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69 lines
1.7 KiB
69 lines
1.7 KiB
1 month ago
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'use strict';
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const { asyncSend } = require('./utils');
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module.exports = function(processFile, childPool) {
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return function process(job) {
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return childPool.retain(processFile).then(async child => {
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let msgHandler;
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let exitHandler;
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await asyncSend(child, {
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cmd: 'start',
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job: job
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});
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const done = new Promise((resolve, reject) => {
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msgHandler = function(msg) {
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switch (msg.cmd) {
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case 'completed':
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resolve(msg.value);
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break;
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case 'failed':
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case 'error': {
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const err = new Error();
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Object.assign(err, msg.value);
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reject(err);
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break;
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}
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case 'progress':
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job.progress(msg.value);
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break;
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case 'update':
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job.update(msg.value);
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break;
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case 'discard':
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job.discard();
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break;
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case 'log':
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job.log(msg.value);
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break;
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}
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};
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exitHandler = (exitCode, signal) => {
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reject(
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new Error(
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'Unexpected exit code: ' + exitCode + ' signal: ' + signal
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)
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);
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};
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child.on('message', msgHandler);
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child.on('exit', exitHandler);
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});
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return done.finally(() => {
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child.removeListener('message', msgHandler);
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child.removeListener('exit', exitHandler);
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if (child.exitCode !== null || /SIG.*/.test(child.signalCode)) {
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childPool.remove(child);
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} else {
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childPool.release(child);
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}
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});
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});
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};
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};
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