# All files ProcessFork.ts

100% Statements 78/78
86.67% Branches 26/30
100% Functions 15/15
100% Lines 73/73

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    1ximport { Processor, ProcessLineResult } from "./Processor";
    import P from "bluebird"
    import { Converter } from "./Converter";
    import { ChildProcess } from "child_process";
    import { CSVParseParam, mergeParams } from "./Parameters";
    import { ParseRuntime } from "./ParseRuntime";
    import { Readable, Writable } from "stream";
    import { bufFromString, emptyBuffer } from "./util";
    import CSVError from "./CSVError";

    export class ProcessorFork extends Processor {
      flush(): P<ProcessLineResult[]> {
        return new P((resolve, reject) => {
          // console.log("flush");
          this.finalChunk = true;
          this.next = resolve;
          this.childProcess.stdin.end();
        });
      }
      destroy(): P<void> {
        this.childProcess.kill();
        return P.resolve();
      }
      childProcess: ChildProcess;
      inited: boolean = false;
      private resultBuf: ProcessLineResult[] = [];
      private leftChunk: string = "";
      private finalChunk: boolean = false;
      private next?: (result: ProcessLineResult[]) => any;
      constructor(protected converter: Converter) {
        super(converter);
        this.childProcess = require("child_process").spawn(process.execPath, [__dirname + "/../v2/worker.js"], {
          stdio: ["pipe", "pipe", "pipe", "ipc"]
        });
        this.initWorker();
      }
      private prepareParam(param:CSVParseParam):any{
        const clone:any=mergeParams(param);
        if (clone.ignoreColumns){
          clone.ignoreColumns={
            source:clone.ignoreColumns.source,
            flags:clone.ignoreColumns.flags
          }
        }
        if (clone.includeColumns){
          clone.includeColumns={
            source:clone.includeColumns.source,
            flags:clone.includeColumns.flags
          }
        }
        return clone;
      }
      private initWorker() {
        this.childProcess.send({
          cmd: "init",
          params: this.prepareParam(this.converter.parseParam)
        } as InitMessage);
        this.childProcess.on("message", (msg: Message) => {
          if (msg.cmd === "inited") {
            this.inited = true;
          } else if (msg.cmd === "eol") {
            if (this.converter.listeners("eol").length > 0){
              this.converter.emit("eol",(msg as StringMessage).value);
            }
          }else if (msg.cmd === "header") {
            if (this.converter.listeners("header").length > 0){
              this.converter.emit("header",(msg as StringMessage).value);
            }
          }else Eif (msg.cmd === "done"){

            this.flushResult();
          }

        });
        this.childProcess.stdout.on("data", (data) => {
          // console.log("stdout", data.toString());
          const res = data.toString();
          this.appendBuf(res);

        });
        this.childProcess.stderr.on("data", (data) => {
          // console.log("stderr", data.toString());
          this.converter.emit("error", CSVError.fromJSON(JSON.parse(data.toString())));
        });

      }
      private flushResult() {
        // console.log("flush result", this.resultBuf.length);
        Eif (this.next) {
          this.next(this.resultBuf);
        }
        this.resultBuf = [];
      }
      private appendBuf(data: string) {
        const res = this.leftChunk + data;
        const list = res.split("\n");
        let counter = 0;
        const lastBit = list[list.length - 1];
        if (lastBit !== "") {
          this.leftChunk = list.pop() || "";
        } else {
          this.leftChunk = "";
        }

        while (list.length) {
          let item = list.shift() || "";
          if (item.length === 0 ) {
            continue;
          }
          Eif (this.params.output !== "line") {
            item = JSON.parse(item);
          }
          this.resultBuf.push(item);
          counter++;
        }
      }

      process(chunk: Buffer): P<ProcessLineResult[]> {
        return new P((resolve, reject) => {
          // console.log("chunk", chunk.length);
          this.next = resolve;
          // this.appendReadBuf(chunk);
          this.childProcess.stdin.write(chunk, () => {
            // console.log("chunk callback");
            this.flushResult();
          });
        });
      }
    }

    export interface Message {
      cmd: string
    }

    export interface InitMessage extends Message {
      params: any;
    }
    export interface StringMessage extends Message {
      value: string
    }
    export const EOM = "\x03";