siege [error] socket: connection refused

2015-09-26 by romanb benchmark, hacks, linux

If you testing stuff with siege and it starts throwing socket: connection refused errors first check if you did not run out of ports for outgoing connections, then use this commands:

sysctl net.ipv4.tcp_tw_reuse=1
sysctl net.ipv4.tcp_tw_recycle=1

Bitbucket show hg commands button

2013-07-01 by romanb bitbucket, hacks, mercurial, ui

Steve Losh noted on Twitter that there's no usable URL to pull changes from pull request in your command line. Well, there is, sorta, pull request page html contain hidden "merge-commands" <pre> in case there are conflicts, all you have to do is show it.

I used greasemonkey to add "hg" button between "merge" and "edit" buttons on pull request page. It looks like this:

Here is script source:

Distinguishable colors for stack graphs

2013-06-29 by romanb hacks, ui

I needed to stack some data on single graph (like network traffic from multiple hosts).

Colors on such graphs should be distinguishable, best approach is evenly space (hue-wise) color palette. To enhance separation every odd color has lower brightness.

It will look something like this:

or this:

I needed it for RRDgraph so here's perl version:

Patch django form field for testing

2013-04-15 by romanb django, hacks, testing

In case you're wondering how to patch Django form field for testing purposes (like URLField that passes local uri: file://...) here's how:

from .forms import ThatForm
from django import forms

class MyTests(TestCase):
    def test_pass_url(self):
        orig_url = ThatForm.base_fields['url']
        ThatForm.base_fields['url'] = forms.CharField()

        # ... do your thing #

        # and just in case set original field back,
        # if other tests need it:
        ThatForm.base_fields['url'] = orig_url

Simplest memcached "top"

2013-03-12 by romanb hacks, linux

Simplest memcached "top" consist of watch, echo and netcat:

watch 'echo -e "stats\nquit\n" |nc 11211'
2011-07-01 by romanb django, hacks

Django smartspaceless

2010-02-10 by romanb django, hacks

Default django spaceless tag is weird, it consumes all spaces between tags and none inside of them. It's good for small parts of site but...

...But I like my html to be cleared of all unnecessary mess which in many cases end up like this:

<a href="...">link1</a> <a href="...">link2</a>
generates awful:

In addition if you like having your templates indented it leaves awful things like:

                                Test text testt

Here's my "smart" version of strip_spaces_between_tags which can be used with overrided spaceless template tag:

def strip_multiple_spaces_between_tags(value):
    """Returns the given HTML with multiple spaces between tags removed."""
    def tagcheck(obj, prefix='', sufix=''):
        tag =
        if tag[0] == '/':
            tag = tag[1:]
        if tag != 'pre':
            return '%s<%s>%s' % (prefix, ''.join(obj.groups('')), sufix)
    def tagprecheck(obj):
        return tagcheck(obj, sufix=' ')
    def tagpostcheck(obj):
        return tagcheck(obj, prefix=' ')

    value = force_unicode(value)
    value = re.sub(r'<(/?[\w]+)([^>]*)>\s{2,}', tagprecheck, value);
    value = re.sub(r'\s{2,}<(/?[\w]+)([^>]*)>', tagpostcheck, value)
    value = re.sub(r'>\s{2,}<', '> <', value)
    return value
strip_multiple_spaces_between_tags = allow_lazy(strip_multiple_spaces_between_tags, unicode)

This does few things:

  • it removes all multiple spaces between tags,
  • it removes all multiple spaces at from "<tag> HERE text HERE </tag>" on all tags except pre.
If you find it useful or you have fix/extension to it (any other tag I should think of?) please feel free to comment.