deployment.py

   1 from __future__ import with_statement
   2
   3 import shutil
   4 import os
   5 import sys
   6 import logging
   7
   8 logging.basicConfig(stream=sys.stderr, format="%(levelname)s:: %(message)s", level=logging.INFO)
   9
  10 from string import Template
  11
  12 class DeploySite(object):
  13
  14     def __init__(self, **env):
  15         self.env = env
  16
  17         for arg in ('ROOT', 'PROJECT_NAME', 'PYTHON_VERSION'):
  18             if arg not in self.env:
  19                 raise ValueError("Argument '%s' is required." % arg)
  20
  21         if 'PYTHON_BASE' not in self.env:
  22             self.env['PYTHON_BASE'] = os.path.join(self.env['ROOT'], 'pythonenv')
  23
  24         if 'PYTHON_BIN' not in self.env:
  25             self.env['PYTHON_BIN'] = os.path.join(
  26                         self.env['PYTHON_BASE'], 'bin', 'python') + self.env['PYTHON_VERSION']
  27
  28         if 'PIP_BIN' not in self.env:
  29             self.env['PIP_BIN'] = os.path.join(self.env['PYTHON_BASE'], 'bin', 'pip')
  30
  31         if 'PYTHON_SITE' not in self.env:
  32             self.env['PYTHON_SITE'] = os.path.join(
  33                         self.env['PYTHON_BASE'], 'lib',
  34                         'python' + self.env['PYTHON_VERSION'], 'site-packages')
  35
  36         if 'APP_DIR' not in self.env:
  37             self.env['APP_DIR'] = os.path.join(self.env['ROOT'], 'application')
  38
  39         if 'CONFIG_DIR' not in self.env:
  40             self.env['CONFIG_DIR'] = os.path.join(self.env['ROOT'], 'etc')
  41
  42         if 'MEDIA_DIR' not in self.env:
  43             self.env['MEDIA_DIR'] = os.path.join(self.env['ROOT'], 'www', 'media')
  44
  45         self._logger = logging.getLogger("deployment")
  46
  47     def info(self, *args, **kwargs):
  48         self._logger.info(*args, **kwargs)
  49
  50     def render_template(self, source, dest, extra_context={}):
  51         self.info("Rendering template: %s", source)
  52
  53         with open(source, 'rb') as source_file:
  54             t = Template(source_file.read())
  55
  56         context = dict(self.env)
  57         context.update(extra_context)
  58
  59         with open(dest, 'wb') as dest_file:
  60             dest_file.write(t.safe_substitute(context))
  61
  62         self.info("Done.")
  63
  64     def restart_app(self):
  65         pass
  66
  67     def update_app(self):
  68         pass
  69
  70     def install_dependencies(self):
  71         pass
  72
  73     def deploy(self):
  74         self.update_app()
  75         self.install_dependencies()
  76         self.update_config()
  77         self.restart_app()
  78
  79     def find_resource(self, path):
  80         for dir in (self.env['CONFIG_DIR'], self.env['APP_DIR']):
  81             full_path = os.path.join(dir, path)
  82             if os.path.isfile(full_path):
  83                 return full_path
  84
  85         raise ValueError("Resource '%s' not found" % path)
  86
  87     @classmethod
  88     def run_deploy(cls, *args, **kwargs):
  89         site = cls(*args, **kwargs)
  90         return site.deploy()
  91
  92 class WSGISite(DeploySite):
  93
  94     def __init__(self, **env):
  95         super(WSGISite, self).__init__(**env)
  96
  97         if 'WSGI_FILE' not in self.env:
  98             self.env['WSGI_FILE'] = os.path.join(self.env['ROOT'], 'www',
  99                                         'wsgi', self.env['PROJECT_NAME']) + '.wsgi'
 100
 101         if 'WSGI_SOURCE_FILE' not in self.env:
 102             self.env['WSGI_SOURCE_FILE'] = 'wsgi_app.template'
 103
 104         if 'WSGI_USER' not in self.env:
 105             self.env['WSGI_USER'] = 'www-data'
 106
 107     def restart_app(self):
 108         self.info("Restarting wsgi application: %s", self.env['WSGI_FILE'])
 109         os.system("touch %s" % self.env['WSGI_FILE'])
 110
 111     def update_config(self):
 112         source = self.find_resource(self.env['WSGI_SOURCE_FILE'])
 113         self.render_template(source, self.env['WSGI_FILE'])
 114
 115 class PIPSite(DeploySite):
 116
 117     def install_dependencies(self):
 118         self.info("Installing requirements")
 119         os.system("%s install -r %s" % (self.env['PIP_BIN'], self.find_resource('requirements.txt')))
 120
 121         try:
 122             self.info("Installing local requirements")
 123             os.system("%s install -r %s" % (self.env['PIP_BIN'], self.find_resource('requirements_local.txt')))
 124         except ValueError:
 125             pass
 126
 127 class GitSite(DeploySite):
 128
 129     def update_app(self):
 130         self.info("Updating repository.")
 131         os.system("cd %s; git pull" % self.env['APP_DIR'])
 132
 133 class ApacheSite(DeploySite):
 134
 135     def __init__(self, **env):
 136         super(ApacheSite, self).__init__(**env)
 137
 138         if 'VHOST_SOURCE_FILE' not in self.env:
 139             self.env['VHOST_SOURCE_FILE'] = 'apache_vhost.template'
 140
 141         if 'VHOST_FILE' not in self.env:
 142             self.env['VHOST_FILE'] = os.path.join(self.env['CONFIG_DIR'], self.env['PROJECT_NAME'] + '.vhost')
 143
 144     def update_config(self):
 145         source = self.find_resource(self.env['VHOST_SOURCE_FILE'])
 146         self.render_template(source, self.env['VHOST_CONFIG_FILE'])