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rxjsをつかって、jsonをgetしてみるサンプル

Last updated at Posted at 2015-09-20
import Rx from 'rx';
import https from 'https';

let promise = Rx.Observable.create(observer => {
      const req = https.request(url, res => {
        if (res.statusCode === 429) {
          const err = new Error('TooManyRequests');
          err.waitTime = Number(res.headers['retry-after']) * 1000;
          return observer.onError(err);
        }
        res.setEncoding('utf8');
        res.on('data', chunk => observer.onNext(chunk));
        res.on('end', () => observer.onCompleted());
        res.on('error', err => observer.onError(err));
      });
      req.setTimeout(this.timeout, () => req.abort());
      req.on('error', err => observer.onError(err));
      req.end();
    })
      .reduce((prev, next) => prev + next)
      .map(JSON.parse)
      .toPromise(Promise);

得られた知見

  • https.requestとhttp.requestは同じなようだ?。
  • IncomingMessage型であるresがcloseイベントがtriggerされることはあまりない
  • requestモジュールはhttp.requestを用いていない←やっぱそんなことなかった

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