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From Noah Slater <>
Subject Re: [jira] Updated: (COUCHDB-393) Cannot discover currently running http port if ini file specifies port 0
Date Fri, 25 Jun 2010 15:20:21 GMT
`couchdb -s` should probably report the URL

On 25 Jun 2010, at 16:08, Benoit Chesneau (JIRA) wrote:

>     [
> Benoit Chesneau updated COUCHDB-393:
> ------------------------------------
>    Attachment: couch_uri.patch
> Here is the patch. It take couch.uri path from the configuration file . by default it's
in %localstatelibdir%/couch.uri .
> It save the uti http://IP:PORT/ on one line when couchdb start. If it's ok for you I
will be happy to commit it today.
>> Cannot discover currently running http port if ini file specifies port 0
>> ------------------------------------------------------------------------
>>                Key: COUCHDB-393
>>                URL:
>>            Project: CouchDB
>>         Issue Type: Improvement
>>         Components: HTTP Interface
>>   Affects Versions: 0.9
>>        Environment: Ubuntu 9.04
>>           Reporter: Stuart Langridge
>>           Assignee: Noah Slater
>>           Priority: Blocker
>>            Fix For: 0.12
>>        Attachments: couch_uri.patch, couchctl.patch
>> It is currently not possible, if the ini file specifies port 0 as the http port (so
that the OS chooses a random port) to discover which port the OS actually chose.
>> It would be nice if the currently running port was made available in the statusline
output (couchdb -s), but a log statement would be adequate; some way that an external script
can discover which port a running CouchDB is listening on.
>> Edited discussion from #couchdb:
>> <bitdiddle> aquarius: well at a glance it appears couch_http passes the 0 to
mochiweb_http which passes it to the mochiweb_socket_server, which passes it to gen_tcp, an
erlang module that lets the underlying OS assign it. mochiweb_socket_server then grabs that
port and stores it. It has a get method to retrieve properties but that needs to be exposed
to mochiweb_http so it would take a little work to do it. It's probably a JIRA ticket, unless
someone else sees a quicker approach
>> <davisp> bitdiddle: you got that far and didn't find it?
>> <aquarius> davisp: is there a better way to find the port?
>> <davisp> oh, is that not the bind port?
>> I was just thinking a log statement
>> <aquarius> davisp: the problem is if you specify 0 as the bind port (so the
OS chooses a port), how do you find out what was chosen?
>> <davisp> aquarius: you have to look at the port returned by the socket
>> aquarius: in other words, CouchDB was never written to do that
>> <davisp> AFAIK
>> <bitdiddle> davisp: I found it, just needs some work to expose it
>> <davisp> aquarius: and by do that, I mean, we never put in a statement to log
>> <bitdiddle> mochiweb_http is the module that needs to bubble it up
>> <aquarius> davisp: I don't really mind whether it's a log statement or it's
exposed to couchdb -s (the latter seems tidier to me, but whichever), I just want to be able
to start couch on port 0 and then later find out which port got chosen :)
>> <davisp> aquarius: for the time being you can use something like netstat or
lsof, but we'll get a log statement in there or something
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