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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-10052) Improve superspawn to allow to handle spawned process io streams
Date Mon, 01 Feb 2016 13:16:39 GMT

    [ https://issues.apache.org/jira/browse/CB-10052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15126228#comment-15126228
] 

ASF GitHub Bot commented on CB-10052:
-------------------------------------

GitHub user vladimir-kotikov opened a pull request:

    https://github.com/apache/cordova-lib/pull/369

    CB-10052 Expose child process' io streams via promise progress notification

    This implements [CB-10052](https://issues.apache.org/jira/browse/CB-10052).
    
    The `superspawn.spawn` promise now emits notifications, which caller can subscribe to
using `progress` method:
    
    ```
    superspawn.spawn('adb', ['devices'])
    .progress(function(data){
        if (data.stderr) console.error('"adb devices" raised an error: ' + data.stderr);
    })
    .then(function(devices){
        // Do something...
    })
    ```

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/MSOpenTech/cordova-lib CB-10052

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/cordova-lib/pull/369.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #369
    
----
commit 5a37978e9aeeeda4f71e876299fce4358f4ed2fd
Author: Vladimir Kotikov <v-vlkoti@microsoft.com>
Date:   2016-01-22T13:39:13Z

    CB-10052 Expose child process' io streams via promise progress notification

----


> Improve superspawn to allow to handle spawned process io streams
> ----------------------------------------------------------------
>
>                 Key: CB-10052
>                 URL: https://issues.apache.org/jira/browse/CB-10052
>             Project: Apache Cordova
>          Issue Type: Improvement
>          Components: CordovaCommon
>    Affects Versions: 1.0.0
>            Reporter: Vladimir Kotikov
>            Assignee: Vladimir Kotikov
>             Fix For: 1.1.0
>
>
> Sometimes it is useful to process spawned process stdout and stderr in some way before
out this to console. The current implementation of superspawn doesn't give a way to do this.
One of the cases when this could be helpful - CB-9971 (see https://github.com/apache/cordova-android/pull/240
for some discussion).
> The proposed approach is:
> 1. Add ability to accept any valid stdio configuration, just like the original child_process.spawn
does (https://nodejs.org/api/child_process.html#child_process_options_stdio)
> 2. Give a way to caller to listen to stdout and stderr events. This might be implemented
as resultant promise progress notification:
> {code:JavaScript}
> spawn('mycommand', [], {stdio: 'pipe'})
> .progress(function (stdio){
>     if (stdio.stderr) {
>         console.error(stdio.stderr);
>     }
> })
> .then(function(result){
>     // do other stuff
> })
> {code}
> Another option is to return na object that implements both EventEmitter and Promise interfaces,
so anybody might subscribe to its events.



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