@netlify/content-engine
Version:
56 lines • 2.4 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.transformImage = transformImage;
const path_1 = __importDefault(require("path"));
const fs_extra_1 = require("fs-extra");
const create_content_digest_1 = require("../../core-utils/create-content-digest");
const cache_1 = require("./utils/cache");
// Lots of work to get the sharp instance
// type Pipeline = ReturnType<Awaited<ReturnType<typeof getSharpInstance>>>;
// queue is used inside transformImage to batch multiple transforms together
// more info inside the transformImage function
const queue = new Map();
async function transformImage({ outputDir, args: { url, filename, contentDigest, httpHeaders, ...args }, }) {
const cache = (0, cache_1.getCache)();
const digest = (0, create_content_digest_1.createContentDigest)({ url, filename, contentDigest, args });
const cacheKey = `image-cdn:` + digest + `:transform`;
const cachedValue = (await cache.get(cacheKey));
if (cachedValue && (await (0, fs_extra_1.pathExists)(cachedValue))) {
return cachedValue;
}
const outputPath = path_1.default.join(outputDir, filename);
await (0, fs_extra_1.mkdirp)(path_1.default.dirname(outputPath));
// if the queue already contains the url, we're going to add it to queue so, we can batch the transforms together.
// We use setImmediate to not block the event loop so the queue can fill up.
if (queue.has(url)) {
const queued = queue.get(url);
queued.transforms.push({ ...args, outputPath });
return queued.promise.then(() => {
cache.set(cacheKey, outputPath);
return outputPath;
});
}
else {
const defer = new Promise((resolve, reject) => {
setImmediate(async () => {
queue.delete(url);
try {
await cache.set(cacheKey, outputPath);
resolve(outputPath);
}
catch (err) {
reject(err);
}
});
});
queue.set(url, {
promise: defer,
transforms: [{ ...args, outputPath }],
});
return defer;
}
}
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