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add support for reading streaming format via node streams
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you under the Apache License, Version 2.0 (the | ||
| // "License"); you may not use this file except in compliance | ||
| // with the License. You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
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| import { PADDING } from '../magic'; | ||
| import { flatbuffers } from 'flatbuffers'; | ||
| import * as Message_ from '../../fb/Message'; | ||
| import ByteBuffer = flatbuffers.ByteBuffer; | ||
| import _Message = Message_.org.apache.arrow.flatbuf.Message; | ||
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| export async function* fromNodeStream(stream: NodeJS.ReadableStream) { | ||
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| let bb: ByteBuffer; | ||
| let bytesRead = 0, bytes = new Uint8Array(0); | ||
| let messageLength = 0, message: _Message | null = null; | ||
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| for await (let chunk of (stream as any as AsyncIterable<Uint8Array | Buffer | string>)) { | ||
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| const grown = new Uint8Array(bytes.length + chunk.length); | ||
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| if (typeof chunk !== 'string') { | ||
| grown.set(bytes, 0) || grown.set(chunk, bytes.length); | ||
| } else { | ||
| for (let i = -1, j = bytes.length, n = chunk.length; ++i < n;) { | ||
| grown[i + j] = chunk.charCodeAt(i); | ||
| } | ||
| } | ||
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| bytes = grown; | ||
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| if (messageLength <= 0) { | ||
| messageLength = new DataView(bytes.buffer).getInt32(0, true); | ||
| } | ||
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| while (messageLength < bytes.length) { | ||
| if (!message) { | ||
| (bb = new ByteBuffer(bytes)).setPosition(4); | ||
| if (message = _Message.getRootAsMessage(bb)) { | ||
| messageLength += message.bodyLength().low; | ||
| continue; | ||
| } | ||
| throw new Error(`Invalid message at position ${bytesRead}`); | ||
| } | ||
| bytesRead += messageLength + PADDING; | ||
| yield bytes.subarray(0, messageLength); | ||
| bytes = bytes.subarray(messageLength + PADDING); | ||
| messageLength = bytes.length <= 0 ? 0 : | ||
| new DataView(bytes.buffer).getInt32(bytes.byteOffset, true); | ||
| message = null; | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
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| export class PipeIterator<T> implements IterableIterator<T> { | ||
| constructor(protected iterator: IterableIterator<T>, protected encoding?: any) {} | ||
| [Symbol.iterator]() { return this.iterator; } | ||
| next(value?: any) { return this.iterator.next(value); } | ||
| throw(error?: any) { | ||
| if (typeof this.iterator.throw === 'function') { | ||
| return this.iterator.throw(error); | ||
| } | ||
| return { done: true, value: null as any }; | ||
| } | ||
| return(value?: any) { | ||
| if (typeof this.iterator.return === 'function') { | ||
| return this.iterator.return(value); | ||
| } | ||
| return { done: true, value: null as any }; | ||
| } | ||
| pipe(stream: NodeJS.WritableStream) { | ||
| let { encoding } = this; | ||
| let res: IteratorResult<T>; | ||
| let write = (err?: any) => { | ||
| stream['removeListener']('error', write); | ||
| stream['removeListener']('drain', write); | ||
| if (err) return this.throw(err); | ||
| if (stream['writable']) { | ||
| do { | ||
| if ((res = this.next()).done) break; | ||
| } while (emit(stream, encoding, res.value)); | ||
| } | ||
| return wait(stream, encoding, res && res.done, write); | ||
| }; | ||
| write(); | ||
| return stream; | ||
| } | ||
| } | ||
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| export class AsyncPipeIterator<T> implements AsyncIterableIterator<T> { | ||
| constructor(protected iterator: AsyncIterableIterator<T>, protected encoding?: any) {} | ||
| [Symbol.asyncIterator]() { return this.iterator; } | ||
| next(value?: any) { return this.iterator.next(value); } | ||
| async throw(error?: any) { | ||
| if (typeof this.iterator.throw === 'function') { | ||
| return this.iterator.throw(error); | ||
| } | ||
| return { done: true, value: null as any }; | ||
| } | ||
| async return(value?: any) { | ||
| if (typeof this.iterator.return === 'function') { | ||
| return this.iterator.return(value); | ||
| } | ||
| return { done: true, value: null as any }; | ||
| } | ||
| pipe(stream: NodeJS.WritableStream) { | ||
| let { encoding } = this; | ||
| let res: IteratorResult<T>; | ||
| let write = async (err?: any) => { | ||
| stream['removeListener']('error', write); | ||
| stream['removeListener']('drain', write); | ||
| if (err) return this.throw(err); | ||
| if (stream['writable']) { | ||
| do { | ||
| if ((res = await this.next()).done) break; | ||
| } while (emit(stream, encoding, res.value)); | ||
| } | ||
| return wait(stream, encoding, res && res.done, write); | ||
| }; | ||
| write(); | ||
| return stream; | ||
| } | ||
| } | ||
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| function emit(stream: NodeJS.WritableStream, encoding: string, value: any) { | ||
| return stream['write']((encoding === 'utf8' ? value + '\n' : value) as any, encoding); | ||
| } | ||
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| function wait(stream: NodeJS.WritableStream, encoding: string, done: boolean, write: (x?: any) => void) { | ||
| const p = eval('process'); // defeat closure compiler | ||
| if (!done) { | ||
| stream['once']('error', write); | ||
| stream['once']('drain', write); | ||
| } else if (!(!p || stream === p.stdout) && !(stream as any)['isTTY']) { | ||
| stream['end'](<any> (encoding === 'utf8' ? '\n' : new Uint8Array(0))); | ||
| } | ||
| } |