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// 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.
import '../../jest-extensions';
import {
Table,
RecordBatchWriter,
RecordBatchFileWriter,
RecordBatchJSONWriter,
RecordBatchStreamWriter,
} from 'apache-arrow';
import * as fs from 'fs';
import { fs as memfs } from 'memfs';
import { Readable, PassThrough } from 'stream';
import randomatic from 'randomatic';
export abstract class ArrowIOTestHelper {
constructor(public table: Table) {}
public static file(table: Table) { return new ArrowFileIOTestHelper(table); }
public static json(table: Table) { return new ArrowJsonIOTestHelper(table); }
public static stream(table: Table) { return new ArrowStreamIOTestHelper(table); }
protected abstract writer(table: Table): RecordBatchWriter;
protected async filepath(table: Table): Promise<fs.PathLike> {
const path = `/${randomatic('a0', 20)}.arrow`;
const data = await this.writer(table).toUint8Array();
await memfs.promises.writeFile(path, data);
return path;
}
buffer(testFn: (buffer: Uint8Array) => void | Promise<void>) {
return async () => {
expect.hasAssertions();
await testFn(await this.writer(this.table).toUint8Array());
};
}
iterable(testFn: (iterable: Generator<Uint8Array>) => void | Promise<void>) {
return async () => {
expect.hasAssertions();
await testFn(chunkedIterable(await this.writer(this.table).toUint8Array()));
};
}
asyncIterable(testFn: (asyncIterable: AsyncGenerator<Uint8Array>) => void | Promise<void>) {
return async () => {
expect.hasAssertions();
await testFn(asyncChunkedIterable(await this.writer(this.table).toUint8Array()));
};
}
fsFileHandle(testFn: (handle: fs.promises.FileHandle) => void | Promise<void>) {
return async () => {
expect.hasAssertions();
const path = await this.filepath(this.table);
await testFn(<any> await memfs.promises.open(path, 'r'));
await memfs.promises.unlink(path);
};
}
fsReadableStream(testFn: (stream: fs.ReadStream) => void | Promise<void>) {
return async () => {
expect.hasAssertions();
const path = await this.filepath(this.table);
await testFn(<any> memfs.createReadStream(path));
await memfs.promises.unlink(path);
};
}
nodeReadableStream(testFn: (stream: NodeJS.ReadableStream) => void | Promise<void>) {
return async () => {
expect.hasAssertions();
const sink = new PassThrough();
sink.end(await this.writer(this.table).toUint8Array());
await testFn(sink);
};
}
whatwgReadableStream(testFn: (stream: ReadableStream) => void | Promise<void>) {
return async () => {
expect.hasAssertions();
const path = await this.filepath(this.table);
await testFn(nodeToDOMStream(memfs.createReadStream(path)));
await memfs.promises.unlink(path);
};
}
whatwgReadableByteStream(testFn: (stream: ReadableStream) => void | Promise<void>) {
return async () => {
expect.hasAssertions();
const path = await this.filepath(this.table);
await testFn(nodeToDOMStream(memfs.createReadStream(path), { type: 'bytes' }));
await memfs.promises.unlink(path);
};
}
}
class ArrowFileIOTestHelper extends ArrowIOTestHelper {
constructor(table: Table) { super(table); }
protected writer(table: Table) {
return RecordBatchFileWriter.writeAll(table);
}
}
class ArrowJsonIOTestHelper extends ArrowIOTestHelper {
constructor(table: Table) { super(table); }
protected writer(table: Table) {
return RecordBatchJSONWriter.writeAll(table);
}
}
class ArrowStreamIOTestHelper extends ArrowIOTestHelper {
constructor(table: Table) { super(table); }
protected writer(table: Table) {
return RecordBatchStreamWriter.writeAll(table);
}
}
export function* chunkedIterable(buffer: Uint8Array) {
let offset = 0, size = 0;
while (offset < buffer.byteLength) {
size = yield buffer.subarray(offset, offset +=
(isNaN(+size) ? buffer.byteLength - offset : size));
}
}
export async function* asyncChunkedIterable(buffer: Uint8Array) {
let offset = 0, size = 0;
while (offset < buffer.byteLength) {
size = yield buffer.subarray(offset, offset +=
(isNaN(+size) ? buffer.byteLength - offset : size));
}
}
export async function concatBuffersAsync(iterator: AsyncIterable<Uint8Array> | ReadableStream) {
if (iterator instanceof ReadableStream) {
iterator = readableDOMStreamToAsyncIterator(iterator);
}
let chunks = [], total = 0;
for await (const chunk of iterator) {
chunks.push(chunk);
total += chunk.byteLength;
}
return chunks.reduce((x, buffer) => {
x.buffer.set(buffer, x.offset);
x.offset += buffer.byteLength;
return x;
}, { offset: 0, buffer: new Uint8Array(total) }).buffer;
}
export async function* readableDOMStreamToAsyncIterator<T>(stream: ReadableStream<T>) {
// Get a lock on the stream
const reader = stream.getReader();
try {
while (true) {
// Read from the stream
const { done, value } = await reader.read();
// Exit if we're done
if (done) { break; }
// Else yield the chunk
yield value as T;
}
} finally {
try { stream.locked && reader.releaseLock(); } catch (e) {}
}
}
export function nodeToDOMStream<T = any>(stream: NodeJS.ReadableStream, opts: any = {}) {
stream = new Readable((stream as any)._readableState).wrap(stream);
return new ReadableStream<T>({
...opts,
start(controller) {
stream.pause();
stream.on('data', (chunk) => {
controller.enqueue(chunk);
stream.pause();
});
stream.on('end', () => controller.close());
stream.on('error', e => controller.error(e));
},
pull() { stream.resume(); },
cancel(reason) {
stream.pause();
if (typeof (stream as any).cancel === 'function') {
return (stream as any).cancel(reason);
} else if (typeof (stream as any).destroy === 'function') {
return (stream as any).destroy(reason);
}
}
});
}
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