json-streaming-reader/dist/src/JsonStreamReader.js

Line delimited and concatenated JSON streaming protocol reader.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const stream_1 = require("stream");
const StreamJson = require("stream-json");
const JsonStreamRecordBuilder_1 = require("./JsonStreamRecordBuilder");
class JsonStreamReader extends stream_1.Transform {
    constructor() {
        super({
            writableObjectMode: false,
            readableObjectMode: true
        });
        this.builder = new JsonStreamRecordBuilder_1.JsonStreamRecordBuilder();
        this.parser = StreamJson({
            jsonStreaming: true,
            streamKeys: false,
            streamNumbers: false,
            streamStrings: false,
            streamValues: false,
        });
        this.parser.on('data', (chunk) => {
            try {
                this.builder.onData(chunk);
            }
            catch (e) {
                this.push(null); // stop stream
                this.emit('error', e);
                return;
            }
            if (this.builder.isDone()) {
                const record = this.builder.getRecord();
                this.builder.purge();
                // push record to stream
                this.push({ record });
            }
        });
    }
    _transform(chunk, encoding, callback) {
        this.parser._transform(chunk, encoding, callback);
    }
}
exports.JsonStreamReader = JsonStreamReader;
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