56 lines
1.8 KiB
JavaScript
56 lines
1.8 KiB
JavaScript
'use strict';
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// Called by `child_process` `fork` in `render-hydrogen-to-string.js` so we can
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// get the data and exit the process cleanly. We don't want Hydrogen to keep
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// running after we get our initial rendered HTML.
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const assert = require('assert');
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const _renderHydrogenToStringUnsafe = require('./3-render-hydrogen-to-string-unsafe');
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// Only kick everything off once we receive the options. We pass in the options
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// this way instead of argv because we will run into `Error: spawn E2BIG` and
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// `Error: spawn ENAMETOOLONG` with argv.
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process.on('message', async (options) => {
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try {
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const resultantHtml = await _renderHydrogenToStringUnsafe(options);
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assert(resultantHtml, `No HTML returned from _renderHydrogenToStringUnsafe.`);
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// Send back the data we need to the parent.
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await new Promise((resolve, reject) => {
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process.send(
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{
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data: resultantHtml,
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},
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(err) => {
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if (err) {
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return reject(err);
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}
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// Exit once we know the data was sent out. We can't gurantee the
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// message was received but this should work pretty well.
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//
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// Related:
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// - https://stackoverflow.com/questions/34627546/process-send-is-sync-async-on-nix-windows
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// - https://github.com/nodejs/node/commit/56d9584a0ead78874ca9d4de2e55b41c4056e502
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// - https://github.com/nodejs/node/issues/6767
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process.exit(0);
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resolve();
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}
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);
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});
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} catch (err) {
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// Serialize the error and send it back up to the parent process so we can
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// interact with it and know what happened when the process exits.
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process.send({
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error: true,
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name: err.name,
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message: err.message,
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stack: err.stack,
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});
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// Throw the error so the process fails and exits
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throw err;
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}
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});
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