mrmBot-Matrix/utils/image-runner.js

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import { createRequire } from "module";
import { isMainThread, parentPort, workerData } from "worker_threads";
import fetch from "node-fetch";
const nodeRequire = createRequire(import.meta.url);
const magick = nodeRequire(`../build/${process.env.DEBUG && process.env.DEBUG === "true" ? "Debug" : "Release"}/image.node`);
const enumMap = {
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"forget": 0,
"northwest": 1,
"north": 2,
"northeast": 3,
"west": 4,
"center": 5,
"east": 6,
"southwest": 7,
"south": 8,
"southeast": 9
};
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export default function run(object) {
return new Promise((resolve, reject) => {
// If the image has a path, it must also have a type
let promise = Promise.resolve();
if (object.path) {
if (object.params.type !== "image/gif" && object.onlyGIF) resolve({
buffer: Buffer.alloc(0),
fileExtension: "nogif"
});
promise = fetch(object.path).then(res => res.arrayBuffer()).then(buf => Buffer.from(buf));
}
// Convert from a MIME type (e.g. "image/png") to something ImageMagick understands (e.g. "png").
// Don't set `type` directly on the object we are passed as it will be read afterwards.
// If no image type is given (say, the command generates its own image), make it a PNG.
const fileExtension = object.params.type ? object.params.type.split("/")[1] : "png";
promise.then(buf => {
object.params.data = buf;
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const objectWithFixedType = Object.assign({}, object.params, { type: fileExtension });
if (objectWithFixedType.gravity) {
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if (isNaN(objectWithFixedType.gravity)) {
objectWithFixedType.gravity = enumMap[objectWithFixedType.gravity];
}
}
try {
const result = magick[object.cmd](objectWithFixedType);
const returnObject = {
buffer: result.data,
fileExtension: result.type
};
resolve(returnObject);
} catch (e) {
reject(e);
}
});
});
}
if (!isMainThread) {
run(workerData)
.then(returnObject => {
parentPort.postMessage(returnObject);
process.exit();
})
.catch(err => {
// turn promise rejection into normal error
throw err;
});
}