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annotate configuration/config.py @ 29:fadcc6ab51d4

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more (de/)serialization stubbing
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 26 Mar 2012 17:00:12 -0700
parents c516ab813079
children b27a7cb2dd5b
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1 #!/usr/bin/env python
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2
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3 """
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4 multi-level unified configuration
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5 """
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6
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7 import sys
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8 import optparse
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9
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10 # imports for contigent configuration providers
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11 try:
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12 import json
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13 except ImportError:
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14 try:
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15 import simplejson as json
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16 except ImportError:
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17 json = None
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18 try:
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19 import yaml
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20 except ImportError:
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21 yaml = None
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22
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23 __all__ = ['Configuration', 'configuration_providers', 'types']
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24
26
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25 ### configuration providers for serialization/deserialization
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26
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27 configuration_providers = []
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28
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29 class ConfigurationProvider(object):
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30 """
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31 abstract base class for configuration providers for
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32 serialization/deserialization
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33 """
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34 def read(self, filename):
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35 raise NotImplementedError("Abstract base class")
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36
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37 def write(self, config, filename):
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38 if isinstance(filename, basestring):
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39 f = file(filename, 'w')
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40 newfile = True
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41 else:
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42 f = filename
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43 newfile = False
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44 try:
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45 self._write(f, config)
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46 finally:
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47 # XXX try: finally: works in python >= 2.5
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48 if newfile:
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49 f.close()
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50 def _write(self, fp, config):
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51 raise NotImplementedError("Abstract base class")
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52
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53 if json:
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54 class JSON(object):
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55 indent = 2
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56 extensions = ['json']
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57 def read(self, filename):
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58 return json.loads(file(filename).read())
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59 def _write(self, fp, config):
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60 fp.write(json.dumps(config), indent=self.indent, sort_keys=True)
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61 # TODO: could use templates to get order down, etc
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62 configuration_providers.append(JSON)
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63
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64 if yaml:
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65 class YAML(object):
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66 extensions = ['yml']
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67 def read(self, filename):
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68 f = file(filename)
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69 config = yaml.load(f)
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70 f.close()
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71 return config
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72 def _write(self, fp, config):
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73 fp.write(yaml.dump(config))
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74 # TODO: could use templates to get order down, etc
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75
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76 configuration_providers.append(YAML)
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77
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78 ### plugins for option types
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79 ### TODO: this could use a bit of thought
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80 def base_cli(name, value):
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81 # CLI arguments
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82 args = value.get('flags', ['--%s' % name])
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83 if not args:
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84 # No CLI interface
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85 return (), {}
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86
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87 kw = {'dest': name}
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88 help = value.get('help', name)
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89 if 'default' in value:
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90 kw['default'] = value['default']
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91 # TODO: use default pattern a la
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92 # - http://hg.mozilla.org/build/talos/file/c6013a2f09ce/talos/PerfConfigurator.py#l358
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93 # - http://k0s.org/mozilla/hg/bzconsole/file/d5e88dadde69/bzconsole/command.py#l12
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94
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95 help += ' [DEFAULT: %s]' % value['default']
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96 kw['help'] = help
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97 kw['action'] = 'store'
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98 return args, kw
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99
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100 def bool_cli(name, value):
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101
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102 # preserve the default values
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103 help = value.get('help')
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104 flags = value.get('flags')
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105
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106 args, kw = base_cli(name, value)
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107 kw['help'] = help # reset
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108 if value.get('default'):
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109 kw['action'] = 'store_false'
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110 if not flags:
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111 args = ['--no-%s' % name]
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112 if not help:
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113 kw['help'] = 'disable %s' % name
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114 else:
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115 kw['action'] = 'store_true'
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116 if not help:
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117 kw['help'] = 'enable %s' % name
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118 return args, kw
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119
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120 def list_cli(name, value):
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121 args, kw = base_cli(name, value)
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122
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123 # TODO: could use 'extend'
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124 # - http://hg.mozilla.org/build/mozharness/file/5f44ba08f4be/mozharness/base/config.py#l41
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125
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126 # TODO: what about nested types?
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127 kw['action'] = 'append'
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128 return args, kw
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129
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130 def int_cli(name, value):
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131 args, kw = base_cli(name, value)
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132 kw['type'] = 'int'
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133 return args, kw
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134
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135 def float_cli(name, value):
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136 args, kw = base_cli(name, value)
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137 kw['type'] = 'float'
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138 return args, kw
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139
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140 types = {bool: bool_cli,
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141 int: int_cli,
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142 float: float_cli,
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143 list: list_cli,
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144 None: base_cli} # default
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145 __all__ += [i.__name__ for i in types.values()]
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146
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147 class Configuration(object):
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148 """declarative configuration object"""
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149
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150 options = {} # configuration basis
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151
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152 def __init__(self, configuration_providers=configuration_providers, types=types):
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153 self.config = {}
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154 self.configuration_providers = configuration_providers
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155 self.types = types
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156
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157 ### methods for iteration
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158 ### TODO: make this a real iterator
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159
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160 def items(self):
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161 # TODO: allow options to be a list of 2-tuples
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162 return self.options.items()
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163
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164 ### methods for validating configuration
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165
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166 def check(self, config):
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167 """
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168 check validity of configuration to be added
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169 """
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170 # TODO: should probably deepcopy config
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171
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172 # ensure options in configuration are in self.options
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173 unknown_options = [i for i in config if i not in self.options]
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174 if unknown_options:
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175 # TODO: more specific error type
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176 raise Exception("Unknown options: %s" % ', '.join(unknown_options))
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177
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178 # TODO: ensure options are of the right type (if specified)
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179 for key, value in config.items():
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180 _type = self.options[key].get('type')
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181 if _type is not None:
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182 config[key] = _type(value)
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183
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184 return config
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185
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186 def validate(self):
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187 """validate resultant configuration"""
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188 # TODO: configuration should be locked after this is called
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189
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190 ### methods for adding configuration
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191
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192 def __call__(self, *args):
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193 """add items to configuration and check it"""
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194 for config in args:
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195 self.add(config)
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196 self.validate() # validate total configuration
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197 # TODO: configuration should be locked after this is called
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198
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199 def add(self, config, check=True):
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200 """update configuration: not undoable"""
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201
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202 self.check(config) # check config to be added
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203 self.config.update(config)
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204 # TODO: option to extend; augment lists/dicts
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205
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206 ### methods for optparse
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207 ### XXX could go in a subclass
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208
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209 def optparse_options(self, parser):
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210 """add optparse options to a OptionParser instance"""
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211 for key, value in self.items():
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212 handler = self.types[value.get('type')]
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213 args, kw = handler(key, value)
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214 if not args:
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215 # No CLI interface
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216 continue
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217 parser.add_option(*args, **kw)
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218
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219 def parser(self, configuration_provider_option=None, **parser_args):
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220 """
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221 return OptionParser for this Configuration instance
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222 - configuration_provider_options : option for configuration files [TODO]
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223 (also TODO: a special value that equates to the first file extension value
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224 for the configuration_providers)
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225 - parser_args : arguments to the OptionParser constructor
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226 """
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227 if 'description' not in parser_args:
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228 parser_args['description'] = getattr(self, '__doc__', '')
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229 if 'formatter' not in parser_args:
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230 class PlainDescriptionFormatter(optparse.IndentedHelpFormatter):
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231 """description formatter for console script entry point"""
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232 def format_description(self, description):
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233 if description:
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234 return description.strip() + '\n'
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235 else:
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236 return ''
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237 parser_args['formatter'] = PlainDescriptionFormatter()
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238 parser = optparse.OptionParser(**parser_args)
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239 self.optparse_options(parser)
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240 return parser
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241
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242 def parse(self, args=sys.argv[1:], parser=None, configuration_provider_option=None):
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243 """parse configuration including command line options"""
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244
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245 # parse arguments
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246 if parser is None:
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247 parser = self.parser(configuration_provider_option=configuration_provider_option)
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248 options, args = parser.parse_args(args)
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249
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250 # get CLI configuration options
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251 cli_config = dict([(key, value) for key, value in options.__dict__.items()
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252 if key in self.options])
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253
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254 # generate configuration
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255 self(cli_config)
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256
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257 # return parsed arguments
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258 return options, args
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259
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260 ### serialization/deserialization
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261
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262 def configuration_provider(self, format):
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263 """configuration provider guess for a given filename"""
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264 for provider in self.configuration_providers:
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265 if format in provider.extensions:
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266 return provider
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267
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268 def serialize(self, filename, format=None):
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269 """serialize configuration to a file"""
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270 # TODO: allow file object vs file name
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271
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272 def deserialize(self, filename, format=None):
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273 """load configuration from a file"""
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274 # TODO: allow file object vs file name
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275
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276 if not format:
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277 extension = os.path.splitext(filename)[-1]
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278