├── .gitignore
├── LICENSE
├── README.md
├── inflight.js
└── package.json


/.gitignore:
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1 | *~
2 | .#*
3 | coverage
4 | .nyc_*
5 | 


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/LICENSE:
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 1 | Copyright (c) 2017, Rebecca Turner <me@re-becca.org>
 2 | 
 3 | Permission to use, copy, modify, and/or distribute this software for any
 4 | purpose with or without fee is hereby granted, provided that the above
 5 | copyright notice and this permission notice appear in all copies.
 6 | 
 7 | THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 8 | WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 9 | MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
10 | ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
12 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
13 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14 | 
15 | 


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/README.md:
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 1 | # promise-inflight
 2 | 
 3 | One promise for multiple requests in flight to avoid async duplication
 4 | 
 5 | ## USAGE
 6 | 
 7 | ```javascript
 8 | const inflight = require('promise-inflight')
 9 | 
10 | // some request that does some stuff
11 | function req(key) {
12 |   // key is any random string.  like a url or filename or whatever.
13 |   return inflight(key, () => {
14 |     // this is where you'd fetch the url or whatever
15 |     return Promise.delay(100)
16 |   })
17 | }
18 | 
19 | // only assigns a single setTimeout
20 | // when it dings, all thens get called with the same result.  (There's only
21 | // one underlying promise.)
22 | req('foo').then(…)
23 | req('foo').then(…)
24 | req('foo').then(…)
25 | req('foo').then(…)
26 | ```
27 | 
28 | ## SEE ALSO
29 | 
30 | * [inflight](https://npmjs.com/package/inflight) - For the callback based function on which this is based.
31 | 
32 | ## STILL NEEDS
33 | 
34 | Tests!
35 | 


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/inflight.js:
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 1 | 'use strict'
 2 | module.exports = inflight
 3 | 
 4 | let Bluebird
 5 | try {
 6 |   Bluebird = require('bluebird')
 7 | } catch (_) {
 8 |   Bluebird = Promise
 9 | }
10 | 
11 | const active = {}
12 | inflight.active = active
13 | function inflight (unique, doFly) {
14 |   return Bluebird.all([unique, doFly]).then(function (args) {
15 |     const unique = args[0]
16 |     const doFly = args[1]
17 |     if (Array.isArray(unique)) {
18 |       return Bluebird.all(unique).then(function (uniqueArr) {
19 |         return _inflight(uniqueArr.join(''), doFly)
20 |       })
21 |     } else {
22 |       return _inflight(unique, doFly)
23 |     }
24 |   })
25 | 
26 |   function _inflight (unique, doFly) {
27 |     if (!active[unique]) {
28 |       active[unique] = (new Bluebird(function (resolve) {
29 |         return resolve(doFly())
30 |       }))
31 |       active[unique].then(cleanup, cleanup)
32 |       function cleanup() { delete active[unique] }
33 |     }
34 |     return active[unique]
35 |   }
36 | }
37 | 


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/package.json:
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 1 | {
 2 |   "name": "promise-inflight",
 3 |   "version": "1.0.1",
 4 |   "description": "One promise for multiple requests in flight to avoid async duplication",
 5 |   "main": "inflight.js",
 6 |   "files": [
 7 |     "inflight.js"
 8 |   ],
 9 |   "license": "ISC",
10 |   "scripts": {
11 |     "test": "echo \"Error: no test specified\" && exit 1"
12 |   },
13 |   "keywords": [],
14 |   "author": "Rebecca Turner <me@re-becca.org> (http://re-becca.org/)",
15 |   "devDependencies": {},
16 |   "repository": {
17 |     "type": "git",
18 |     "url": "git+https://github.com/iarna/promise-inflight.git"
19 |   },
20 |   "bugs": {
21 |     "url": "https://github.com/iarna/promise-inflight/issues"
22 |   },
23 |   "homepage": "https://github.com/iarna/promise-inflight#readme"
24 | }
25 | 


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