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WIP prompt if port is already in use. #101

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chocnut
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@chocnut chocnut commented Jul 22, 2016

Here's my initial attempt to #85

screen shot 2016-07-23 at 5 25 11 am

screen shot 2016-07-23 at 5 25 32 am

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@sotojuan
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FWIW I was working on a solution for the port issue here that doesn't use a prompt/notification but it's clear you put in a lot of work here so happy to give it to you if the powers that be accept.

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@chocnut
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chocnut commented Jul 22, 2016

Hey @sotojuan yeah I saw you push too, since this is my quick hack maybe we can work on this fix.

@ghost ghost added the CLA Signed label Jul 22, 2016
@chocnut chocnut changed the title WIP notify if port is used and ask to confirm to use available port. WIP prompt if port is used and ask to confirm to use available port. Jul 22, 2016
@ghost ghost added the CLA Signed label Jul 22, 2016
@chocnut chocnut changed the title WIP prompt if port is used and ask to confirm to use available port. WIP prompt if port is used. Jul 22, 2016
@chocnut chocnut changed the title WIP prompt if port is used. WIP prompt if port is already in use. Jul 22, 2016
@ghost ghost added the CLA Signed label Jul 22, 2016
@gaearon
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gaearon commented Jul 23, 2016

This doesn’t merge cleanly right now, could you rebase please?

formattedErrors.forEach(message => {
console.log(message);
console.log();
rl.question('Something is already running at http://localhost:' + PORT + '. Would you like to run the app at another port instead? [Y/n] ', function(answer){
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Just a nit, can you add a space between ) and {: function(answer) {

@chocnut
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chocnut commented Jul 24, 2016

@eanplatter should be fixed now.

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@mxstbr
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mxstbr commented Jul 24, 2016

I'm not sure if we're supporting Node 0.12, if we are those will need to be anonymous functions since 0.12 doesn't support arrow functions.

@chocnut
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chocnut commented Jul 24, 2016

@mxstbr @eanplatter I've removed arrow functions for consistency

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chocnut commented Jul 26, 2016

@gaearon moved prompt to utilities.

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@chocnut
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chocnut commented Jul 26, 2016

still checking out why ci failed.

@queso
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queso commented Jul 26, 2016

Why remove the ability to set a port via the environment? Using a tool like hotel works best when it can set the port for you, so removing that seems like a bad idea. Is there another way to set the port via command line?

@jlbruno
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jlbruno commented Jul 26, 2016

@queso did this ability exist before this PR? I don't believe any ability is being removed.

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@brownieboy
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For me, the error is slightly different:

Error: listen EACCES 127.0.0.1:3000

I'm running Windows, and my company appears to have something called Appsense running something or other on port 3000, which I can't shut down (and would likely be breaking some IT policy if I did).

I don't need any clever port detection/reassignment. Just give me a way of overriding it with a command line switch.

@gaearon
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gaearon commented Jul 27, 2016

Why remove the ability to set a port via the environment? Using a tool like hotel works best when it can set the port for you, so removing that seems like a bad idea. Is there another way to set the port via command line?

It was not removed, this ability did not exist in the first place. We do plan to introduce it in some way. Please read #102.

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gaearon commented Jul 27, 2016

I'm running Windows, and my company appears to have something called Appsense running something or other on port 3000, which I can't shut down (and would likely be breaking some IT policy if I did).

As far as I understand, this PR should solve temporarily solve the problem for you. We can discuss a broader solution in #102. Please bear in mind this project has existed for a couple of weeks, so we can‘t add all requested features at once. 😉

@queso
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queso commented Jul 27, 2016

I misread a line of code... I was looking at 10c6adf#diff-1ab6f53c8795042e5d1f961d6e6b75e5L22

I read it backwards, false alarm. I actually think this PR would make it easier to override a port from the command line, so I would be interested in this.

@gaearon
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gaearon commented Jul 27, 2016

Squashed and merged with a few fixes via 2edf218.
Thank you very much!
(I credited the result commit to you.)

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gaearon commented Jul 28, 2016

@queso

Newly created apps will now offer to run on a different port if the default is taken. And you can override the default with PORT environment variable if you really need to.

You can either create a new app or update the react-scripts dependency to 0.2.0 for this to be available.

@brownieboy
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brownieboy commented Jul 29, 2016

Works fine for me with 0.2.0. The code picked up that "Something is already running at port 3000" and offered to switch to another port. It picked port 3001 when I hit "y", and all good after that.

@gaearon
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gaearon commented Jul 29, 2016

(You can also just press as y is the default)

@MoOx
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MoOx commented Aug 10, 2016

Just curious: why do you ask and why don't you just start on another port? In most case this user might answer "yes".

@gaearon
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gaearon commented Aug 10, 2016

You can press Enter to skip the message (it defaults to "yes").

We ask because sometimes people run two instances unintentionally (eg in another terminal tab) and don't actually want two processes.

STRML added a commit to STRML/next.js that referenced this pull request Oct 25, 2016
STRML added a commit to STRML/next.js that referenced this pull request Oct 26, 2016
Based on create-react-app and specifically
facebook/create-react-app#101

In production, will exit(1) if the port is in use.
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