52 lines
1.7 KiB
JavaScript
52 lines
1.7 KiB
JavaScript
import { createRequire } from "module";
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import { isMainThread, parentPort, workerData } from "worker_threads";
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import fetch from "node-fetch";
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const nodeRequire = createRequire(import.meta.url);
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const magick = nodeRequire(`../build/${process.env.DEBUG && process.env.DEBUG === "true" ? "Debug" : "Release"}/image.node`);
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function run(object) {
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return new Promise((resolve, reject) => {
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// If the image has a path, it must also have a type
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let promise = new Promise((resolveTest) => { resolveTest(); }); // no-op
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if (object.path) {
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if (object.type !== "image/gif" && object.onlyGIF) resolve({
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buffer: Buffer.alloc(0),
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fileExtension: "nogif"
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});
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promise = fetch(object.path).then(res => res.buffer());
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}
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// Convert from a MIME type (e.g. "image/png") to something ImageMagick understands (e.g. "png").
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// Don't set `type` directly on the object we are passed as it will be read afterwards.
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// If no image type is given (say, the command generates its own image), make it a PNG.
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const fileExtension = object.type ? object.type.split("/")[1] : "png";
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promise.then(buf => {
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object.data = buf;
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const objectWithFixedType = Object.assign({}, object, {type: fileExtension});
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try {
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const result = magick[object.cmd](objectWithFixedType);
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const returnObject = {
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buffer: result.data,
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fileExtension: result.type
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};
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resolve(returnObject);
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} catch (e) {
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reject(e);
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}
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});
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});
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}
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if (!isMainThread) {
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run(workerData)
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.then(returnObject => {
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parentPort.postMessage(returnObject);
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process.exit();
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return;
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})
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.catch(err => {
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// turn promise rejection into normal error
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throw err;
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});
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}
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