reduct-js/lib/esm/Record.js

ReductStore Client SDK for Javascript/NodeJS/Typescript

import Stream from "stream";
import { Buffer } from "buffer";
/**
 * Represents a record in an entry for reading
 */
export class ReadableRecord {
    /**
     * Constructor which should be call from Bucket
     * @internal
     */
    constructor(time, size, last, head, stream, labels, contentType, arrayBuffer) {
        this.labels = {};
        this.time = time;
        this.size = size;
        this.last = last;
        this.stream = stream;
        this.labels = labels;
        this.contentType = contentType;
        this.arrayBuffer = arrayBuffer;
        if (head) {
            this.arrayBuffer = new ArrayBuffer(0);
        }
    }
    /**
     * Read content of record
     */
    async read() {
        if (this.arrayBuffer !== undefined) {
            return new Promise((resolve, reject) => {
                try {
                    resolve(Buffer.from(this.arrayBuffer));
                }
                catch (error) {
                    reject(error);
                }
            });
        }
        const chunks = [];
        return new Promise((resolve, reject) => {
            this.stream.on("data", (chunk) => chunks.push(chunk));
            this.stream.on("error", (err) => reject(err));
            this.stream.on("end", () => resolve(Buffer.concat(chunks)));
        });
    }
    /**
     * Read content of record and convert to string
     */
    async readAsString() {
        return (await this.read()).toString();
    }
}
/**
 * Represents a record in an entry for writing
 */
export class WritableRecord {
    /**
     * Constructor for stream
     * @internal
     */
    constructor(bucketName, entryName, options, httpClient) {
        this.bucketName = bucketName;
        this.entryName = entryName;
        this.httpClient = httpClient;
        this.options = options;
    }
    /**
     * Write data to record asynchronously
     * @param data stream of buffer with data
     * @param size size of data in bytes (only for streams)
     */
    async write(data, size) {
        let contentLength = size || 0;
        if (!(data instanceof Stream)) {
            contentLength = data.length;
        }
        const { bucketName, entryName, options } = this;
        const headers = {
            "Content-Length": contentLength.toString(),
            "Content-Type": options.contentType ?? "application/octet-stream",
        };
        for (const [key, value] of Object.entries(options.labels ?? {})) {
            headers[`x-reduct-label-${key}`] = value.toString();
        }
        if (options.ts === undefined) {
            throw new Error("Timestamp must be set");
        }
        await this.httpClient.post(`/b/${bucketName}/${entryName}?ts=${options.ts}`, data, {
            headers: headers,
        });
    }
}