reduct-js/lib/esm/Record.js

ReductStore Client SDK for Javascript/NodeJS/Typescript

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) {
        this.labels = {};
        this.time = time;
        this.size = size;
        this.last = last;
        this.stream = stream;
        this.labels = labels;
        this.contentType = contentType;
    }
    /**
     * Read content of record
     */
    async read() {
        const reader = this.stream.getReader();
        const chunks = [];
        let done = false;
        while (!done) {
            const { value, done: isDone } = await reader.read();
            done = isDone;
            if (value) {
                chunks.push(value);
            }
        }
        const total = chunks.reduce((n, c) => n + c.length, 0);
        const out = new Uint8Array(total);
        let offset = 0;
        for (const c of chunks) {
            out.set(c, offset);
            offset += c.length;
        }
        return Buffer.from(out);
    }
    /**
     * Read content of record and convert to string
     */
    async readAsString() {
        return new TextDecoder().decode(await this.read());
    }
}
/**
 * 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 or buffer with data
     * @param size size of data in bytes (only for streams)
     */
    async write(data, size) {
        let contentLength = BigInt(size ?? 0);
        let dataToSend = data;
        if (data instanceof (ReadableStream)) {
            if (size === undefined) {
                throw new Error("Size must be set for stream");
            }
        }
        else if (data instanceof Buffer || typeof data === "string") {
            contentLength = BigInt(data.length);
        }
        else if (data["readable"] !== undefined) {
            // a hack for Node.js streams
            const stream = data;
            if (stream.readable) {
                dataToSend = new ReadableStream({
                    async pull(controller) {
                        const chunk = stream.read();
                        if (chunk) {
                            controller.enqueue(chunk);
                        }
                        else {
                            controller.close();
                        }
                    },
                });
            }
            else {
                throw new Error("Invalid stream");
            }
        }
        else {
            throw new Error("Invalid data type");
        }
        const { bucketName, entryName, options } = this;
        const headers = {
            "Content-Type": options.contentType ?? "application/octet-stream",
            "Content-Length": contentLength.toString(),
        };
        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}`, dataToSend, headers);
    }
}