ceph/src/arrow/js/bin/stream-to-file.js

   1 #! /usr/bin/env node
   2
   3 // Licensed to the Apache Software Foundation (ASF) under one
   4 // or more contributor license agreements.  See the NOTICE file
   5 // distributed with this work for additional information
   6 // regarding copyright ownership.  The ASF licenses this file
   7 // to you under the Apache License, Version 2.0 (the
   8 // "License"); you may not use this file except in compliance
   9 // with the License.  You may obtain a copy of the License at
  10 //
  11 //   http://www.apache.org/licenses/LICENSE-2.0
  12 //
  13 // Unless required by applicable law or agreed to in writing,
  14 // software distributed under the License is distributed on an
  15 // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  16 // KIND, either express or implied.  See the License for the
  17 // specific language governing permissions and limitations
  18 // under the License.
  19
  20 // @ts-check
  21
  22 const fs = require('fs');
  23 const path = require('path');
  24 const eos = require('util').promisify(require('stream').finished);
  25 const extension = process.env.ARROW_JS_DEBUG === 'src' ? '.ts' : '';
  26 const { RecordBatchReader, RecordBatchFileWriter } = require(`../index${extension}`);
  27
  28 (async () => {
  29
  30     const readable = process.argv.length < 3 ? process.stdin : fs.createReadStream(path.resolve(process.argv[2]));
  31     const writable = process.argv.length < 4 ? process.stdout : fs.createWriteStream(path.resolve(process.argv[3]));
  32
  33     const streamToFile = readable
  34         .pipe(RecordBatchReader.throughNode())
  35         .pipe(RecordBatchFileWriter.throughNode())
  36         .pipe(writable);
  37
  38     await eos(streamToFile);
  39
  40 })().catch((e) => { console.error(e); process.exit(1); });