http://theabele.com/2015-09-20T00:00:00+03:002015-09-20T00:00:00+03:00Janis Abeletag:theabele.com,2015-09-20:dev/abstract-test-case-pytest

<p>The solution I came up with:</p> <div class="gist"> <script src='https://gist.github.com/ee049b1fdf7e4a1af71a.js?file=test_map_contract.py'></script> <noscript> <pre><code>import pytest def square(num): return num * num def recursive_map(f, _list): """Recusive map implementation.""" if not _list: return [] else: head, *tail = _list h = [f(head)] h.extend(recursive_map(f, tail)) return h class MapContract(object): @pytest.fixture def a_map(self): raise NotImplementedError('Not Implemented Yet') def test_can_handle_small_list(self, a_map): assert list(a_map(square, [1,3,4])) == [1, 9, 16] def test_can_handle_large_list(self, a_map): num = 10000 assert len(list(a_map(square, range(num)))) == num class TestSTDLibContract(MapContract): @pytest.fixture def a_map(self): return map class TestRecursiveMap(MapContract): @pytest.fixture def a_map(self): return recursive_map </code></pre> </noscript> </div> <p>Further reading:</p> <ul class="simple"> <li><a class="reference external" href="http://www.c2.com/cgi/wiki?AbstractTestCases">Abstract Test Case</a></li> <li><a class="reference external" href="http://blog.thecodewhisperer.com/2005/03/02/in-brief-contract-tests/">Contract Test</a></li> <li><a class="reference external" href="http://pytest.org/latest/fixture.html">pytest fixtures</a></li> </ul>

2015-09-20T00:00:00+03:00Janis Abeletag:theabele.com,2015-09-20:dev/how-to-use-fabric-with-salt-stack

<p>I like to use <a class="reference external" href="http://www.fabfile.org/">Fabric</a> in combination with <a class="reference external" href="http://saltstack.com/">Salt-Stack</a>. My current setup looks like:</p> <div class="gist"> <script src='https://gist.github.com/4ffbffe1871d47afa4c7.js?file=fabfile.py'></script> <noscript> <pre><code>from fabric.api import sudo, task, env, local, settings from fabric.contrib.files import upload_template from fabric.contrib.project import upload_project import os salt_task = hosts('@'.join([os.environ['AS_MASTER_USER'], os.environ['AS_MASTER_HOST']])) """Decorator to specify Salt-Stack master user and host.""" @task def bootstrap_master(): """Use insecure one-liner to install Salt-Stack master.""" # XXX: Fails on Docker, see # https://github.com/saltstack/salt-bootstrap/issues/394 with settings(warn_only=True): sudo('curl -L http://bootstrap.saltstack.org | sudo sh -s -- -M -N') upload_template( filename='master.template', destination='/etc/salt/master', template_dir='config', use_sudo=True, use_jinja=True, ) sudo('service salt-master restart') @task def bootstrap(master_hostname, hostname): """Setup salt minion. $ fab -H <some_host> bootstrap:<master_hostname>,<some_host_readable_name> """ with settings(warn_only=True): sudo('curl -L http://bootstrap.saltstack.org | sudo sh') context = { 'master_hostname': master_hostname, 'id': hostname, } upload_template( filename='minion.template', destination='/etc/salt/minion', template_dir='config', context=context, use_sudo=True, use_jinja=True, ) sudo('service salt-minion restart') @task def sync_states(): """Sync Salt-Stack state files.""" upload_project(local_dir='config/salt', remote_dir='/srv', use_sudo=True) upload_project(local_dir='config/pillar', remote_dir='/srv', use_sudo=True) @task def master(): """Run in production.""" env.user = os.environ['AS_MASTER_USER'] env.hosts = os.environ['AS_MASTER_HOST'] @task def vagrant(): """Run tasks on vagrant instance.""" env.user = 'vagrant' env.hosts = ['127.0.0.1:2222'] result = local('vagrant ssh-config | grep IdentityFile', capture=True) env.key_filename = result.split()[1] @salt_task @task def nginx_reload(*servername_seq): """Restart Nginx service.""" salt('service.relaod nginx', *servername_seq) def salt(cmd, *servername_seq): """Run salt command on given hosts.""" args = '-L' if '*' not in servername_seq else '' cmd = cmd if cmd else 'cmd.run "uptime"' env.output_prefix = False sudo('salt {args} "{servername_csv}" {cmd}'.format( args=args, servername_csv=','.join(servername_seq), cmd=cmd, ))</code></pre> </noscript> </div> <p>Bootstrap master:</p> <div class="highlight"><pre>fab master bootstrap_master </pre></div> <p>To add new minion run:</p> <div class="highlight"><pre>fab -H &lt;minion_host&gt; -u &lt;minion_user&gt; bootstrap:&lt;master_ip&gt;,&lt;human_readable_minion_hostname&gt; </pre></div> <p>Project layout:</p> <div class="highlight"><pre>├── config │   ├── master.template │   ├── minion.template │   ├── pillar │   │   ├── base.sls │   │   ├── homepage.sls │   │   └── top.sls │   └── salt │   ├── _modules │   ├── _states │   ├── apps │   ├── firewall │   ├── nginx │   ├── python │   ├── supervisor │   └── top.sls ├── env │   ├── AS_MASTER_HOST │   └── AS_MASTER_USER ├── fabfile.py └── requirements.txt </pre></div> <ul class="simple"> <li>Keep configuration outside code with <a class="reference external" href="https://pypi.python.org/pypi/envdir">envdir</a>. <cite>$AS_MASTER_USER</cite>, <cite>$AS_MASTER_HOST</cite> environment variables contains master host details.</li> <li>Explicitly copy state files to master. Allows to cheat and check states without committing to configuration repository.</li> </ul>

2014-12-26T00:00:00+02:00Janis Abeletag:theabele.com,2014-12-26:misc/alwas-on-usb-connector

<p>I'm fed up with RTFM. High-current or <a class="reference external" href="http://bit.ly/1CMNiJP">sleep-and-charge</a> USB connector is usually color coded yellow, orange or red. In ThinkPad manual it's called Always on USB connector.</p>