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