This commit is contained in:
2025-06-26 04:42:51 +00:00
parent be418b1f32
commit 78212cc2a9
183 changed files with 41796 additions and 0 deletions

View File

@@ -0,0 +1,141 @@
var async = require('./async.js');
// API
module.exports = {
iterator: wrapIterator,
callback: wrapCallback
};
/**
* Wraps iterators with long signature
*
* @this ReadableAsyncKit#
* @param {function} iterator - function to wrap
* @returns {function} - wrapped function
*/
function wrapIterator(iterator)
{
var stream = this;
return function(item, key, cb)
{
var aborter
, wrappedCb = async(wrapIteratorCallback.call(stream, cb, key))
;
stream.jobs[key] = wrappedCb;
// it's either shortcut (item, cb)
if (iterator.length == 2)
{
aborter = iterator(item, wrappedCb);
}
// or long format (item, key, cb)
else
{
aborter = iterator(item, key, wrappedCb);
}
return aborter;
};
}
/**
* Wraps provided callback function
* allowing to execute snitch function before
* real callback
*
* @this ReadableAsyncKit#
* @param {function} callback - function to wrap
* @returns {function} - wrapped function
*/
function wrapCallback(callback)
{
var stream = this;
var wrapped = function(error, result)
{
return finisher.call(stream, error, result, callback);
};
return wrapped;
}
/**
* Wraps provided iterator callback function
* makes sure snitch only called once,
* but passes secondary calls to the original callback
*
* @this ReadableAsyncKit#
* @param {function} callback - callback to wrap
* @param {number|string} key - iteration key
* @returns {function} wrapped callback
*/
function wrapIteratorCallback(callback, key)
{
var stream = this;
return function(error, output)
{
// don't repeat yourself
if (!(key in stream.jobs))
{
callback(error, output);
return;
}
// clean up jobs
delete stream.jobs[key];
return streamer.call(stream, error, {key: key, value: output}, callback);
};
}
/**
* Stream wrapper for iterator callback
*
* @this ReadableAsyncKit#
* @param {mixed} error - error response
* @param {mixed} output - iterator output
* @param {function} callback - callback that expects iterator results
*/
function streamer(error, output, callback)
{
if (error && !this.error)
{
this.error = error;
this.pause();
this.emit('error', error);
// send back value only, as expected
callback(error, output && output.value);
return;
}
// stream stuff
this.push(output);
// back to original track
// send back value only, as expected
callback(error, output && output.value);
}
/**
* Stream wrapper for finishing callback
*
* @this ReadableAsyncKit#
* @param {mixed} error - error response
* @param {mixed} output - iterator output
* @param {function} callback - callback that expects final results
*/
function finisher(error, output, callback)
{
// signal end of the stream
// only for successfully finished streams
if (!error)
{
this.push(null);
}
// back to original track
callback(error, output);
}

View File

@@ -0,0 +1,63 @@
{
"name": "asynckit",
"version": "0.4.0",
"description": "Minimal async jobs utility library, with streams support",
"main": "index.js",
"scripts": {
"clean": "rimraf coverage",
"lint": "eslint *.js lib/*.js test/*.js",
"test": "istanbul cover --reporter=json tape -- 'test/test-*.js' | tap-spec",
"win-test": "tape test/test-*.js",
"browser": "browserify -t browserify-istanbul test/lib/browserify_adjustment.js test/test-*.js | obake --coverage | tap-spec",
"report": "istanbul report",
"size": "browserify index.js | size-table asynckit",
"debug": "tape test/test-*.js"
},
"pre-commit": [
"clean",
"lint",
"test",
"browser",
"report",
"size"
],
"repository": {
"type": "git",
"url": "git+https://github.com/alexindigo/asynckit.git"
},
"keywords": [
"async",
"jobs",
"parallel",
"serial",
"iterator",
"array",
"object",
"stream",
"destroy",
"terminate",
"abort"
],
"author": "Alex Indigo <iam@alexindigo.com>",
"license": "MIT",
"bugs": {
"url": "https://github.com/alexindigo/asynckit/issues"
},
"homepage": "https://github.com/alexindigo/asynckit#readme",
"devDependencies": {
"browserify": "^13.0.0",
"browserify-istanbul": "^2.0.0",
"coveralls": "^2.11.9",
"eslint": "^2.9.0",
"istanbul": "^0.4.3",
"obake": "^0.1.2",
"phantomjs-prebuilt": "^2.1.7",
"pre-commit": "^1.1.3",
"reamde": "^1.1.0",
"rimraf": "^2.5.2",
"size-table": "^0.2.0",
"tap-spec": "^4.1.1",
"tape": "^4.5.1"
},
"dependencies": {}
}