commit 8c599e8e5c9db65647e15c6fe91510f91c6b6668 Author: David Braun Date: Fri Oct 6 21:01:34 2017 -0400 Initial release. diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..df9af16 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +coverage +node_modules +npm-debug.log diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d645695 --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed 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. diff --git a/README.md b/README.md new file mode 100644 index 0000000..adadb83 --- /dev/null +++ b/README.md @@ -0,0 +1,230 @@ +# Introduction + +This is an idiomatic, minimally-opinionated `Channel` type for JavaScript that's inspired by [Go](https://golang.org/)'s concurrency model. It works in browsers and in Node.js. If you know how to use `Array` then you already know most of how to use `Channel`. + +## Why + +Go's concurrency model is amazing and with JavaScript's async/await feature we have the basis for it as well. All that's missing is a `Channel` type. There are existing libraries that implement one but they're generally ports from other languages and don't feel like they were made for JavaScript. I wanted an idiomatic `Channel` type that's simple and minimally-opinionated. + +This document assumes you're familiar with Go's concurrency model and why you'd want to use it. For explanatory background, read my [blog article](https://www.NodeGuy.com/concurrency-in-javascript) on the subject. + +## Requirements + +ES 2017 + +## Installation + +```shell +$ npm install @nodeguy/channel +``` + +## Basic Use + +Create a channel with `Channel()`. + +To send an value to a channel, use `push`. To receive an value from a channel, use `shift`. Always precede the method calls with `await`: + +```JavaScript +const assert = require('assert') +const Channel = require('@nodeguy/channel') + +const channel = Channel() + +;(async () => { + await channel.push(42) +})() + +;(async () => { + assert.equal(await channel.shift(), 42) +})() +``` + +The `push` and `shift` methods are usually called in different async functions. They represent the two different ends of the channel and act to coordinate the behavior of the async functions. + +# API + +## New Properties + +The following properties don't have equivalents in `Array`. + +### close() -> async + +Closes the channel so that no more values can be pushed to it. Returns a promise that resolves when any remaining pushes in flight complete. + +Attempting to push to a closed channel will throw an exception and shifting from a closed channel will immediately return `undefined`. + +### readOnly() -> Channel + +Returns a version of the channel that provides only read methods. + +### value + +Set to the most recently `shift`ed value. This is useful when used in combination with `select`. + +### writeOnly() -> Channel + +Returns a version of the channel that provides only write methods. + +### Channel.select(methods) -> async channel + +`Channel.select` attempts to call multiple channel `methods` in parallel and returns the channel of the first one that succeeds. Only the winning method is executed to completion—the other methods have no effect. + +#### Examples + +Imagine you're at a party and your next conversation depends on whom you run +into first: Alice, Bob, or Charlie. + +```JavaScript +switch (await Channel.select(alice.shift(), bob.shift(), charlie.push(`Hi!`)) { + case alice: + console.log(`Alice said ${alice.value}.`) + break + + case bob: + console.log(`Bob said ${bob.value}.`) + break + + case charlie: + console.log(`I said "hi" to Charlie.`) + break +} +``` + +Be careful of unintended side effects, however. Even though only one value is pushed in the following example, the counter is incremented twice. + +``` +let counter = 0 + +const increment = () => { + counter++ + return counter +} + +await Channel.select(alice.push(increment()), bob.push(increment())) +assert.equal(counter, 2) +``` + +Sometimes you don't want to wait until a method completes. You can use this pattern to return immediately even if no methods are ready: + +```JavaScript +const closed = Channel() +closed.close() + +switch (await Channel.select(alice.shift(), bob.shift(), closed.shift()) { + case alice: + console.log(`Alice said ${alice.value}.`) + break + + case bob: + console.log(`Bob said ${bob.value}.`) + break + + default: + console.log(`No one has anything to say yet.`) +} +``` + +You can also arrange it so that the select completes within a timeout: + +```JavaScript +const timeout = Channel() +setTimeout(timeout.close, 1000) + +switch (await Channel.select(alice.shift(), bob.shift(), timeout.shift()) { + case alice: + console.log(`Alice said ${alice.value}.`) + break + + case bob: + console.log(`Bob said ${bob.value}.`) + break + + default: + console.log(`I stopped listening after one second.`) +} +``` + +## Array-like Methods + +These methods are similar to the equivalently named methods of `Array`. + +### Channel + +#### Channel([bufferLength = 0]) -> Channel + +Create a new `Channel` with an optional buffer. + +#### Channel.of(...values) -> Channel + +#### Channel.from(iterable | stream.Readable) -> Channel + +Create a new `Channel` from an iterable or a [Node.js readable stream](https://nodejs.org/api/stream.html#stream_readable_streams). + +### Channel Object + +#### filter(callbackfn[, thisArg]) -> Channel +#### forEach(callbackfn[, thisArg]) -> async + +The promise returned by `forEach` resolves when the channel is closed: + +```JavaScript +const toArray = async (channel) => { + const array = [] + + await channel.forEach((value) => { + array.push(value) + }) + + return array +} +``` + +If `callbackfn` is async then `forEach` will wait for it before iterating to the next value: + +```JavaScript +const pipe = async (source, sink) => { + await source.forEach(sink.push) + sink.close() +} +``` + +#### join(separator) -> async String +#### map(callbackfn[, thisArg]) -> Channel +#### push(value) -> async bufferLength + +Unlike `Array`'s method, `push` accepts only one `value` at a time. + +Sends the value into the channel and returns a promise that resolves when the value has been shifted out or placed in the buffer. + +* Throws a `TypeError` when attempting to push to a closed channel. +* Throws a `TypeError` when attempting to push `undefined` because it's a reserved value used to indicate a closed channel. + +#### reduce(callbackfn[, initialValue]) +#### shift() -> Promise + +Returns a promise that resolves when an value is received from the channel. Closed channels always return `undefined` immediately. + +#### slice(start, end) -> Channel + +# Contributing + +Please [submit an issue](https://github.com/NodeGuy/channel/issues/new) if you would like me to make `Channel` more `Array`-like (e.g., by adding another `Array` method). + +# Similar Projects + +* [Channel](https://github.com/gozala/channel) +* [cochan](https://github.com/skozin/cochan) +* [js-csp](https://github.com/ubolonton/js-csp) +* [node-csp](https://github.com/olahol/node-csp) + +# Copyright + +Copyright 2017 [David Braun](https://www.NodeGuy.com/) + +Licensed under the Apache License, Version 2.0 (the "License"); you may not use +these files 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. diff --git a/lib/index.js b/lib/index.js new file mode 100644 index 0000000..5622f64 --- /dev/null +++ b/lib/index.js @@ -0,0 +1,312 @@ +'use strict' + +// An order represents a pending push or shift. +const Order = (channel) => { + let order + const preonFulfilleds = [] + + const promise = new Promise((resolve, reject) => { + order = { + resolve: (value) => { + preonFulfilleds.forEach((preonFulfilled) => { + preonFulfilled(value) + }) + + resolve(value) + }, + + reject + } + }) + + Object.assign(promise, { + cancel: () => { + order.cancelled = true + }, + + channel, + + prethen: (onFulfilled) => { + preonFulfilleds.push(onFulfilled) + } + }) + + return {order, promise} +} + +const Channel = function (bufferLength = 0) { + let buffered = 0 + let closed = false + let lastValue + let resolvedIndex = 0 + const pushes = [] + const shifts = [] + + // Process the push and shift queues like an order book, looking for matches. + const processOrders = () => { + const index = {push: 0, shift: 0} + + // Match pushes and shifts. + while ((index.push < pushes.length) && (index.shift < shifts.length)) { + const push = pushes[index.push] + const shift = shifts[index.shift] + + if (push.cancelled) { + index.push++ + } else if (shift.cancelled) { + index.shift++ + } else { + lastValue = push.value + shift.resolve(lastValue) + buffered = Math.max(0, buffered - 1) + index.push++ + index.shift++ + } + } + + // Resolve push promises up to the end of the buffer. + for ( + ; + (resolvedIndex < index.push) || + ((resolvedIndex < pushes.length) && (buffered < bufferLength)); + resolvedIndex++ + ) { + const {cancelled, resolve} = pushes[resolvedIndex] + + if (!cancelled) { + if (resolvedIndex > index.push) { + buffered++ + } + + resolve(bufferLength) + } + } + + // If the channel is closed then resolve 'undefined' to remaining shifts. + if (closed) { + for (; + index.shift < shifts.length; + index.shift++ + ) { + const {cancelled, resolve} = shifts[index.shift] + + if (!cancelled) { + lastValue = undefined + resolve(lastValue) + } + } + } + + pushes.splice(0, index.push) + shifts.splice(0, index.shift) + resolvedIndex -= index.push + } + + const readOnly = Object.freeze({ + filter: (callbackfn, thisArg) => { + const output = Channel() + + ;(async () => { + for (;;) { + const value = await readOnly.shift() + + if (value === undefined) { + await output.close() + break + } else if (callbackfn.call(thisArg, value)) { + await output.push(value) + } + } + })() + + return output + }, + + forEach: async (callbackfn, thisArg) => { + for (;;) { + const value = await readOnly.shift() + + if (value === undefined) { + break + } else { + await callbackfn.call(thisArg, value) + } + } + }, + + join: async (separator) => { + const elements = [] + + await readOnly.forEach((element) => { + elements.push(element) + }) + + return elements.join(separator) + }, + + map: (callbackfn, thisArg) => { + const output = Channel() + + ;(async () => { + await readOnly.forEach((value) => + output.push(callbackfn.call(thisArg, value)) + ) + + output.close() + })() + + return output + }, + + readOnly: () => readOnly, + + reduce: async (callbackfn, ...initialValue) => { + let previousValue = initialValue[0] + let previousValueDefined = initialValue.length > 0 + + await readOnly.forEach((currentValue) => { + if (previousValueDefined) { + previousValue = callbackfn(previousValue, currentValue, 0, readOnly) + } else { + previousValue = currentValue + previousValueDefined = true + } + }) + + return previousValue + }, + + shift: function () { + const {order, promise} = Order(this) + shifts.push(order) + setImmediate(processOrders) + return Object.freeze(promise) + }, + + slice: (start, end = Infinity) => { + const output = Channel() + + ;(async () => { + for (let index = 0; index < end; index++) { + const value = await readOnly.shift() + + if (value === undefined) { + break + } else if (index >= start) { + await output.push(value) + } + } + + await output.close() + })() + + return output + }, + + get value () { + return lastValue + } + }) + + const writeOnly = Object.freeze({ + close: () => + new Promise((resolve, reject) => { + if (closed) { + reject(new Error(`Can't close an already-closed channel.`)) + } else { + closed = true + processOrders() + + // Give remaining orders in flight time to resolve before returning. + setImmediate(resolve) + } + }), + + push: function (value) { + const {order, promise} = Order(this) + order.value = value + + if (closed) { + order.reject(new Error(`Can't push to closed channel.`)) + } else if (value === undefined) { + order.reject(new TypeError( + `Can't push 'undefined' to channel, use close instead.` + )) + } else { + pushes.push(order) + setImmediate(processOrders) + } + + return Object.freeze(promise) + }, + + writeOnly: () => writeOnly + }) + + // Use Object.create because readOnly has a getter. + return Object.freeze(Object.assign(Object.create(readOnly), writeOnly)) +} + +Channel.from = (values) => { + const channel = Channel() + + ;(async () => { + try { + // iterable + for (let value of values) { + await channel.push(value) + } + + await channel.close() + } catch (exception) { + // Assume it's a Node.js stream.readable. + + values.on('readable', async () => { + while (true) { + const data = values.read() + + if (data === null) { + break + } else { + await channel.push(data) + } + } + }) + + values.once('end', channel.close) + } + })() + + return channel +} + +Channel.of = (...values) => + Channel.from(values) + +Channel.select = (...methodPromises) => { + const promise = new Promise((resolve, reject) => { + methodPromises.forEach(async (promise) => { + promise.prethen(() => { + // We've been given a heads-up that this method will complete first so + // cancel the other method calls. + methodPromises.forEach((other) => { + if (other !== promise) { + other.cancel() + } + }) + }) + + try { + await promise + } catch (exception) { + reject(exception) + } + + resolve(promise.channel) + }) + }) + + return promise +} + +module.exports = Object.freeze(Channel) diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..32f5516 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,2267 @@ +{ + "name": "@nodeguy/channel", + "version": "0.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "@nodeguy/assert": { + "version": "https://registry.npmjs.org/@nodeguy/assert/-/assert-0.1.1.tgz", + "integrity": "sha1-ksEBQ14uhLVFS9M7Z9bEozNyqz4=", + "dev": true, + "requires": { + "lodash.isequal": "https://registry.npmjs.org/lodash.isequal/-/lodash.isequal-4.5.0.tgz" + } + }, + "abbrev": { + "version": "1.0.9", + "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz", + "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=", + "dev": true + }, + "acorn": { + "version": "5.1.2", + "resolved": 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"0.1.1", + "husky": "0.14.3", + "mocha": "3.5.3", + "standard": "10.0.3" + }, + "homepage": "https://github.com/NodeGuy/channel", + "keywords": [ + "CSP", + "channel", + "concurrency" + ], + "license": "Apache-2.0", + "main": "lib/index.js", + "repository": { + "type": "git", + "url": "git+https://github.com/NodeGuy/channel.git" + }, + "scripts": { + "precommit": "standard", + "pretest": "standard", + "test": "mocha --recursive" + }, + "standard": { + "globals": [ + "after", + "afterEach", + "before", + "beforeEach", + "describe", + "it", + "run" + ] + } +} diff --git a/test/go/README.md b/test/go/README.md new file mode 100644 index 0000000..3f32070 --- /dev/null +++ b/test/go/README.md @@ -0,0 +1 @@ +The tests in this directory are translated from [Go's tests](https://github.com/golang/go/tree/bad5abf64d76f9c302c084c5f62e6f70920d3c81/test/chan). diff --git a/test/go/doubleselect.js b/test/go/doubleselect.js new file mode 100644 index 0000000..30f53ad --- /dev/null +++ b/test/go/doubleselect.js @@ -0,0 +1,77 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Test the situation in which two cases of a select can +// both end up running. See http://codereview.appspot.com/180068. + +'use strict' + +const Channel = require('../../lib') + +it(`doubleselect`, async function () { + this.timeout(10 * 1000) + const iterations = 100000 // number of iterations + + // sender sends a counter to one of four different channels. If two cases both + // end up running in the same iteration, the same value will be sent to two + // different channels. + const sender = async (n, c1, c2, c3, c4) => { + for (let i = 0; i < n; i++) { + await Channel.select(c1.push(i), c2.push(i), c3.push(i), c4.push(i)) + } + + c1.close() + c2.close() + c3.close() + c4.close() + } + + // mux receives the values from sender and forwards them onto another channel. + // It would be simpler to just have sender's four cases all be the same + // channel, but this doesn't actually trigger the bug. + const mux = async (output, input, done) => { + await input.forEach(async (value) => { + await output.push(value) + }) + + await done.push(true) + } + + // recver gets a steam of values from the four mux's and checks for + // duplicates. + const recver = (input) => { + const seen = new Map() + + input.forEach((v) => { + if (seen.has(v)) { + throw new Error(`got duplicate value: ${v}`) + } + + seen.set(v, true) + }) + } + + const c1 = Channel() + const c2 = Channel() + const c3 = Channel() + const c4 = Channel() + const done = Channel() + const cmux = Channel() + sender(iterations, c1, c2, c3, c4) + mux(cmux, c1, done) + mux(cmux, c2, done) + mux(cmux, c3, done) + mux(cmux, c4, done) + + // We keep the recver because it might catch more bugs in the future. + // However, the result of the bug linked to at the top is that we'll + // end up panicking with: "throw: bad g->status in ready". + recver(cmux) + + await done.shift() + await done.shift() + await done.shift() + await done.shift() + cmux.close() +}) diff --git a/test/go/fifo.js b/test/go/fifo.js new file mode 100644 index 0000000..6846962 --- /dev/null +++ b/test/go/fifo.js @@ -0,0 +1,61 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Test that unbuffered channels act as pure fifos. + +'use strict' + +const Channel = require('../../lib') + +it(`fifo`, function () { + const N = 10 + + const AsynchFifo = async () => { + const ch = Channel(10) + + for (let i = 0; i < N; i++) { + await ch.push(i) + } + + for (let i = 0; i < N; i++) { + if (await ch.shift() !== i) { + throw new Error(`bad receive`) + } + } + } + + const Chain = async (ch, val, input, output) => { + await input.shift() + + if (await ch.shift() !== val) { + throw new Error(val) + } + + await output.push(1) + } + + // thread together a daisy chain to read the elements in sequence + const SynchFifo = async () => { + const ch = Channel() + let input = Channel() + let start = input + + for (let i = 0; i < N; i++) { + const output = Channel() + Chain(ch, i, input, output) + input = output + } + + await start.push(0) + + for (let i = 0; i < N; i++) { + await ch.push(i) + } + + await input.shift() + } + + AsynchFifo() + SynchFifo() +}) diff --git a/test/go/goroutines.js b/test/go/goroutines.js new file mode 100644 index 0000000..c2c7d7c --- /dev/null +++ b/test/go/goroutines.js @@ -0,0 +1,33 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Torture test for goroutines. +// Make a lot of goroutines, threaded together, and tear them down cleanly. + +'use strict' + +const Channel = require('../../lib') + +it(`goroutines`, async function () { + const f = async (left, right) => { + await left.push(await right.shift()) + } + + const n = 10000 + const leftmost = Channel() + let right = leftmost + let left = leftmost + + for (let i = 0; i < n; i++) { + right = Channel() + f(left, right) + left = right + } + + ;(async (c) => { + await c.push(1) + })(right) + + await leftmost.shift() +}) diff --git a/test/go/select.js b/test/go/select.js new file mode 100644 index 0000000..52a3775 --- /dev/null +++ b/test/go/select.js @@ -0,0 +1,73 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Test simple select. + +'use strict' + +const Channel = require('../../lib') + +it(`select`, async function () { + const closed = Channel() + closed.close() + let counter = 0 + let shift = 0 + + const GetValue = () => { + counter++ + return 1 << shift + } + + const Send = async (a, b) => { + let done = false + let i = 0 + + do { + switch (await Channel.select(a.push(GetValue()), b.push(GetValue()), + closed.shift())) { + case a: + i++ + a = Channel() + break + + case b: + i++ + b = Channel() + break + + default: + done = true + } + + shift++ + } while (!done) + + return i + } + + let a = Channel(1) + let b = Channel(1) + let v = await Send(a, b) + + if (v !== 2) { + throw new Error(`Send returned ${v} !== 2`) + } + + const av = await a.shift() + const bv = await b.shift() + + if ((av | bv) !== 3) { + throw new Error(`bad values ${av} ${bv}`) + } + + v = await Send(a, Channel()) + + if (v !== 1) { + throw new Error(`Send returned ${v} !== 1`) + } + + if (counter !== 10) { + throw new Error(`counter is ${counter} !== 10`) + } +}) diff --git a/test/index.js b/test/index.js new file mode 100644 index 0000000..2876ffb --- /dev/null +++ b/test/index.js @@ -0,0 +1,339 @@ +'use strict' + +const assert = require('@nodeguy/assert') +const Channel = require('../lib') +const stream = require('stream') + +const toArray = async (channel) => { + const array = [] + + await channel.forEach((item) => { + array.push(item) + }) + + return array +} + +describe(`Channel`, function () { + it(`allows the use of new`, function () { + return new Channel() + }) + + it(`is frozen`, function () { + assert.throws(() => { + Channel.frozen = false + }) + }) + + it(`creates a frozen object`, function () { + assert.throws(() => { + Channel().frozen = false + }) + }) + + it(`creates a buffered channel`, async function () { + const channel = Channel(2) + + ;(async () => { + assert.equal(await channel.shift(), 0) + })() + + await channel.push(0, 1, 2) + }) + + describe(`from`, function () { + it(`iterable`, async function () { + assert.deepEqual(await toArray(Channel.from([0, 1, 2])), [0, 1, 2]) + }) + + it(`Node.js's stream.readOnly`, async function () { + const readOnly = stream.PassThrough({objectMode: true}) + readOnly.write(0) + readOnly.write(1) + readOnly.end(2) + assert.deepEqual(await toArray(Channel.from(readOnly)), [0, 1, 2]) + }) + }) + + it(`of`, async function () { + assert.deepEqual(await toArray(Channel.of(0, 1, 2)), [0, 1, 2]) + }) + + describe(`select`, function () { + it(`miscellaneous`, async function () { + const a = Channel() + const b = Channel() + + ;(async () => { + await b.push(0) + await a.push(1) + await a.shift() + })() + + assert.equal(await Channel.select(a.shift(), b.shift()), b) + assert.equal(b.value, 0) + assert.equal(await a.shift(), 1) + assert.equal(await Channel.select(a.push(0), b.shift()), a) + }) + }) + + it(`allows for non-blocking selects`, async function () { + const a = Channel() + const b = Channel() + const nonBlocking = Channel() + nonBlocking.close() + + switch (await Channel.select(a.shift(), b.push(0), nonBlocking.shift())) { + case a: + assert(false) + break + + case b: + assert(false) + break + + default: + assert(true) + break + } + }) +}) + +describe(`Channel object`, function () { + describe(`close`, function () { + it(`can't close an already closed channel`, function (done) { + const channel = Channel() + channel.close() + + channel.close() + .then(() => { + done(new Error()) + }) + .catch((reason) => { + assert.deepEqual( + reason, + new Error(`Can't close an already-closed channel.`) + ) + + done() + }) + }) + + it(`can't push to a closed channel`, async function () { + const channel = Channel() + channel.close() + + return (async () => { + await channel.push(0) + })().then(() => { + assert(false) + }).catch((reason) => { + assert.deepEqual(reason, new Error(`Can't push to closed channel.`)) + }) + }) + + it(`returns 'undefined' immediately from shift`, async function () { + const channel = Channel() + channel.close() + assert.strictEqual(await channel.shift(), undefined) + }) + }) + + it(`filter`, async function () { + assert.deepEqual( + await toArray(Channel.of(0, 1, 2, 3, 4, 5).filter(x => x % 2 !== 0)), + [1, 3, 5] + ) + }) + + it(`forEach`, async function () { + const output = Channel() + + ;(async () => { + await Channel.of(0, 1, 2).forEach(output.push) + output.close() + })() + + assert.deepEqual(await toArray(output), [0, 1, 2]) + }) + + it(`join`, async function () { + assert.equal(await Channel.of(`a`, `b`, `c`).join(), `a,b,c`) + }) + + it(`map`, async function () { + assert.deepEqual( + await toArray(Channel.of(`a`, `b`, `c`).map(x => x.toUpperCase())), + [`A`, `B`, `C`] + ) + }) + + describe(`push`, function () { + it(`with shift`, async function () { + const channel = Channel() + + ;(async () => { + await channel.push(0) + })() + + assert.equal(await channel.shift(), 0) + }) + + describe(`undefined`, function () { + it(`outside select`, function () { + const channel = Channel() + + return (async () => { + await channel.push(undefined) + })().then(() => { + assert(false) + }).catch((reason) => { + assert.deepEqual( + reason, + new TypeError(`Can't push 'undefined' to channel, use close instead.`) + ) + }) + }) + + it(`inside select`, function () { + const channel = Channel() + + return (async () => { + await Channel.select(channel.push(undefined)) + })().then(() => { + assert(false) + }).catch((reason) => { + assert.deepEqual( + reason, + new TypeError(`Can't push 'undefined' to channel, use close instead.`) + ) + }) + }) + }) + + it(`returns a frozen promise`, function () { + assert.throws(() => { + Channel().push(0).frozen = false + }) + }) + }) + + it(`readOnly`, async function () { + const channel = Channel() + const readOnly = channel.readOnly() + + assert.throws(() => { + readOnly.close() + }) + + assert.throws(() => { + readOnly.push(0) + }) + + assert.throws(() => { + readOnly.writeOnly() + }) + + ;(async () => { + await channel.push(1) + })() + + assert.equal(readOnly.readOnly(), readOnly) + assert.equal(await readOnly.shift(), 1) + assert.equal(readOnly.value, 1) + + assert.throws(() => { + readOnly.frozen = false + }) + }) + + it(`reduce`, async function () { + assert.equal(await Channel.of(0, 1, 2) + .reduce((previous, current) => previous + current), + 3 + ) + + assert.equal(await Channel.of(0, 1, 2) + .reduce((previous, current) => previous + current, 10), + 13 + ) + }) + + describe(`shift`, function () { + it(`with push`, async function () { + const channel = Channel() + + ;(async () => { + await channel.push(0) + })() + + assert.equal(await channel.shift(), 0) + }) + + it(`returns a frozen promise`, function () { + assert.throws(() => { + Channel().shift().frozen = false + }) + }) + }) + + describe(`slice`, function () { + it(`start`, async function () { + assert.deepEqual(await toArray(Channel.of(0, 1, 2).slice(1)), [1, 2]) + }) + + it(`end`, async function () { + assert.deepEqual( + await toArray(Channel.of(0, 1, 2, 3, 4).slice(1, 4)), + [1, 2, 3] + ) + }) + }) + + it(`value`, async function () { + const channel = Channel() + + ;(async () => { + await channel.push(0) + })() + + await channel.shift() + assert.equal(channel.value, 0) + + assert.throws(() => { + channel.value = 1 + }) + + channel.close() + await channel.shift() + assert.equal(channel.value, undefined) + }) + + describe(`writeOnly`, function () { + it(`provides only write methods`, async function () { + const channel = Channel() + const writeOnly = channel.writeOnly() + + assert.throws(() => { + writeOnly.readOnly() + }) + + assert.throws(() => { + writeOnly.shift() + }) + + assert.equal(writeOnly.value, undefined) + + ;(async () => { + await channel.shift() + })() + + await writeOnly.push(0) + writeOnly.close() + + assert.throws(() => { + writeOnly.frozen = false + }) + }) + }) +}) diff --git a/wallaby.js b/wallaby.js new file mode 100644 index 0000000..ecfc313 --- /dev/null +++ b/wallaby.js @@ -0,0 +1,5 @@ +module.exports = () => ({ + files: ['lib/**/*.js'], + tests: ['test/*.js'], + env: {type: 'node'} +})