commit 86878e0894c2c1d82ac7f03110aa4586ed8b0ccf Author: Sven Slootweg Date: Mon Jul 20 22:37:08 2020 +0200 Initial commit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..3c3629e --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +node_modules diff --git a/example.js b/example.js new file mode 100644 index 0000000..57ecacf --- /dev/null +++ b/example.js @@ -0,0 +1,30 @@ +"use strict"; + +const Promise = require("bluebird"); +const simpleSource = require("./"); +const collect = require("@ppstreams/collect"); // FIXME: add devdep +const pipe = require("@ppstreams/pipe"); +const EndOfStream = require("@ppstreams/end-of-stream"); + +function generateNumbers() { + let i = 0; + let max = 10; + + return simpleSource({ onRequest: () => { + if (i < max) { + i += 1; + return i; + } else { + throw new EndOfStream(); + } + }}); +} + +return Promise.try(() => { + return pipe([ + generateNumbers(), + collect() + ]).read(); +}).then((result) => { + console.log(result); +}); diff --git a/index.js b/index.js new file mode 100644 index 0000000..563212d --- /dev/null +++ b/index.js @@ -0,0 +1,89 @@ +"use strict"; + +const Promise = require("bluebird"); +const Aborted = require("@ppstreams/aborted"); + +const { validateOptions } = require("@validatem/core"); +const required = require("@validatem/required"); +const isFunction = require("@validatem/is-function"); +const wrapValueAsOption = require("@validatem/wrap-value-as-option"); + +module.exports = function simpleSource(_options) { + let { onRequest, onAbort } = validateOptions(arguments, [ + required, + wrapValueAsOption("onResult"), { + onRequest: [ required, isFunction ], + onAbort: [ isFunction ] + } + ]); + + let errorReason; + let peekQueue = []; + + return { + description: `simple source`, + peek: function peekValue_simpleSource() { + return Promise.try(() => { + if (errorReason != null) { + return true; + } else { + // FIXME: Store Promises in the peekQueue instead? Or would this make it more difficult to deal with concurrent peeks/reads? And should the peek spec be changed to account for this? + return Promise.try(() => { + return onRequest(); + }).then((result) => { + peekQueue.push({ type: "value", value: result }); + }).catch((error) => { + peekQueue.push({ type: "error", error: error }); + }).then(() => { + // FIXME: What if there's an EndOfStream marker being produced? Or an abort? Or some other sort of failure? Shouldn't that return/produce something *other than* `true`? + return true; + }); + } + }); + }, + read: function produceValue_simpleSource() { + return Promise.try(() => { + if (peekQueue.length > 0) { + /* FIXME: Move all this logic out into an itemBuffer abstraction of some sort (also useful in from-node-stream?) */ + let item = peekQueue.shift(); + + if (item.type === "value") { + return item.value; + } else if (item.type === "error") { + throw item.error; + } else { + throw new Error(`Found a queue item of type '${item.type}'; this is a bug in @ppstreams/simple-source, please report it`); + } + } else { + if (errorReason != null) { + if (errorReason === true) { + throw new Aborted("Stream was aborted"); + } else if (errorReason instanceof Error) { + throw new Aborted(`Stream was aborted due to error: ${errorReason.message}`, {reason: errorReason}); + } + } else { + return onRequest(); + } + } + }); + }, + abort: function abort_simpleSource(reason) { + return Promise.try(() => { + if (errorReason == null) { + if (reason === true || reason instanceof Error) { + errorReason = reason; + + if (onAbort != null) { + return onAbort(reason); + } + } else { + throw new Error("You must specify a reason (either `true` or an Error object) when aborting a stream"); + } + } else { + // FIXME: Require this behaviour in the spec? Or is there a composability-related reason to permit/require quietly ignoring this, to make it idempotent? + throw new Error(`The stream is already aborted`); + } + }); + } + }; +}; diff --git a/package.json b/package.json new file mode 100644 index 0000000..0b9f07b --- /dev/null +++ b/package.json @@ -0,0 +1,20 @@ +{ + "name": "@ppstreams/simple-source", + "version": "0.1.0", + "main": "index.js", + "repository": "http://git.cryto.net/ppstreams/simple-source.git", + "author": "Sven Slootweg ", + "license": "WTFPL OR CC0-1.0", + "dependencies": { + "@ppstreams/aborted": "^0.1.0", + "@validatem/core": "^0.3.12", + "@validatem/is-function": "^0.1.0", + "@validatem/required": "^0.1.1", + "@validatem/wrap-value-as-option": "^0.1.0", + "bluebird": "^3.7.2" + }, + "devDependencies": { + "@ppstreams/end-of-stream": "^0.1.0", + "@ppstreams/pipe": "^0.1.0" + } +} diff --git a/yarn.lock b/yarn.lock new file mode 100644 index 0000000..9c6a64f --- /dev/null +++ b/yarn.lock @@ -0,0 +1,279 @@ +# THIS IS AN AUTOGENERATED FILE. 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