gis-tools-ts/dist/readers/serve/tileserve.worker.js

A collection of geospatial tools primarily designed for WGS84, Web Mercator, and S2.

import { TileStore, fileTypeToReader } from '../../index.js';
/**
 * # Server Tile Worker
 *
 * A worker that, given a source and options, fetches the data, converts it to tiles,
 * and handles requests
 */
class TileWorker {
    #sourceWorker;
    #store;
    #textEncoder = new TextEncoder();
    /**
     * Tile-ize input vector features and store them
     * @param event - the init message or a feature message
     */
    onmessage(event) {
        const { data } = event;
        if (data.type === 'init') {
            if (event.ports !== undefined && event.ports.length !== 0)
                this.#loadWorkerPort(event.ports[0], event.ports[1]);
            void this.#handleInit(data);
        }
        else if (event.type === 'tilerequest')
            this.#handleRequest(data);
    }
    /**
     * Load worker. First message that comes in upon creation of this worker
     * @param messagePort - the communication port to talk listen to a source worker's messages
     * @param postPort - the communication port to send messages to the source worker
     */
    #loadWorkerPort(messagePort, postPort) {
        this.#sourceWorker = postPort;
        messagePort.onmessage = this.onmessage.bind(this);
    }
    /**
     * Handle an init message
     * @param event - the init message
     */
    async #handleInit(event) {
        // setup reader and store, then build
        const reader = await fileTypeToReader(event.url, event.inputType);
        this.#store = new TileStore(undefined, event.options);
        await this.#store.buildReader(reader);
    }
    /**
     * Handle a tile request
     * @param event - the tile request
     */
    #handleRequest(event) {
        const { id } = event;
        const tile = this.#store?.getTile(id);
        const data = this.#textEncoder.encode(JSON.stringify(tile)).buffer;
        const message = { type: 'tileresponse', id, data };
        if (this.#sourceWorker !== undefined)
            this.#sourceWorker.postMessage(message, [data]);
        else
            self.postMessage(message);
    }
}
const tileWorker = new TileWorker();
self.onmessage = tileWorker.onmessage.bind(tileWorker);
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