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Viewing changes to formulas/mediawiki/hooks/cache-relation-changed

  • Committer: Francis J. Lacoste
  • Date: 2011-05-27 15:21:22 UTC
  • Revision ID: francis.lacoste@canonical.com-20110527152122-l8akt2g34hwz1zpj
Split out from principia-tools.

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formulas/mediawiki/hooks/cache-relation-changed
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#!/usr/bin/env python
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import subprocess
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import os
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import tempfile
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import pprint
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import json
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# all changes mean we should regen the file
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memcached_ips = []
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rl = subprocess.Popen("relation-list",stdout=subprocess.PIPE)
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for memcached_unit in rl.stdout:
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    p = subprocess.Popen(["relation-get", "--format", "json", "-", memcached_unit],
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            stdout=subprocess.PIPE, close_fds=True)
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    settings = json.loads(p.stdout.read().strip())
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    try:
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        if len(settings['ip']) and len(settings['port']):
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            memcached_ips.append("'"+settings['ip']+":"+settings['port']+"'")
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    except KeyError:
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        print memcached_unit + " has no settings. ["+str(settings)+"]"
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rl.wait()
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pprint.pprint(memcached_ips)
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memcache_template = """<?php
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$wgMainCacheType = CACHE_MEMCACHED;
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$wgMemCachedServers = array(%s);
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$wgSessionsInMemcached = true;
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"""
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with tempfile.NamedTemporaryFile(dir='/etc/mediawiki',delete=False) as settings:
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    subprocess.call(["chmod","0644",settings.name])
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    if len(memcached_ips):
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        settings.write(memcache_template % ','.join(memcached_ips))
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    else:
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        settings.write("<?php\n#No Memcached Servers\n")
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    try:
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        os.unlink('/etc/mediawiki/memcached_settings.php.old')
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    except:
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        pass
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    os.rename('/etc/mediawiki/memcached_settings.php','/etc/mediawiki/memcached_settings.php.old')
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    os.rename(settings.name, '/etc/mediawiki/memcached_settings.php')