@m-ld/gateway/ext/lib/StringReadable.js

m-ld gateway for services

import { Readable } from 'stream';
export class StringReadable extends Readable {
    constructor(source, format, opts) {
        super(opts);
        this.index = -1;
        const openIfRequired = () => {
            if (this.index === -1) {
                if (format.opening != null)
                    this.push(Buffer.from(format.opening));
                this.index = 0;
            }
        };
        this.subs = source.subscribe({
            next: async (bite) => {
                openIfRequired();
                const subjectStr = format.stringify(bite.value);
                this.push(Buffer.from(`${this.index++ ? format.separator : ''}${subjectStr}`));
                this.next = bite.next;
            },
            complete: () => {
                openIfRequired();
                if (format.closing != null)
                    this.push(Buffer.from(format.closing));
                this.push(null);
            },
            error: err => {
                this.destroy(err);
            }
        });
    }
    _read(size) {
        if (this.next) {
            this.next();
            delete this.next;
        }
    }
    _destroy(error, callback) {
        this.subs.unsubscribe();
        callback(error);
    }
}
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