Method read

valdi/vscode_debugger/src/targets/valdi/callback-file.ts:31–61

* Reads the file, returnings its contants after they're written, or returns * undefined if the file was disposed of before the read completed.

(pollInterval = CallbackFile.pollInterval)

   * undefined if the file was disposed of before the read completed.
   */
  public read(pollInterval = CallbackFile.pollInterval) {
    if (this.readPromise) {
      return this.readPromise;
    }

    this.readPromise = new Promise<T>((resolve, reject) => {
      const interval = setInterval(() => {
        if (this.disposed) {
          clearInterval(interval);
          resolve(undefined);
          return;
        }

        if (!existsSync(this.path)) {
          return;
        }

        try {
          resolve(JSON.parse(readFileSync(this.path, 'utf-8')));
        } catch (e) {
          reject(e);
        } finally {
          this.dispose();
        }

        clearInterval(interval);
      }, pollInterval);
    });

    return this.readPromise;
  }

  /**
   * Diposes of the callback file.