Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/pluggy/manager.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 import inspect
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2 import sys
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3 from . import _tracing
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4 from .callers import _Result
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5 from .hooks import HookImpl, _HookRelay, _HookCaller, normalize_hookimpl_opts
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6 import warnings
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7
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8 if sys.version_info >= (3, 8):
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9 from importlib import metadata as importlib_metadata
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10 else:
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11 import importlib_metadata
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12
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13
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14 def _warn_for_function(warning, function):
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15 warnings.warn_explicit(
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16 warning,
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17 type(warning),
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18 lineno=function.__code__.co_firstlineno,
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19 filename=function.__code__.co_filename,
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20 )
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21
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22
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23 class PluginValidationError(Exception):
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24 """ plugin failed validation.
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25
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26 :param object plugin: the plugin which failed validation,
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27 may be a module or an arbitrary object.
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28 """
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29
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30 def __init__(self, plugin, message):
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31 self.plugin = plugin
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32 super(Exception, self).__init__(message)
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33
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34
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35 class DistFacade(object):
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36 """Emulate a pkg_resources Distribution"""
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37
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38 def __init__(self, dist):
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39 self._dist = dist
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40
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41 @property
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42 def project_name(self):
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43 return self.metadata["name"]
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44
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45 def __getattr__(self, attr, default=None):
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46 return getattr(self._dist, attr, default)
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47
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48 def __dir__(self):
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49 return sorted(dir(self._dist) + ["_dist", "project_name"])
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50
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51
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52 class PluginManager(object):
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53 """ Core :py:class:`.PluginManager` class which manages registration
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54 of plugin objects and 1:N hook calling.
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55
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56 You can register new hooks by calling :py:meth:`add_hookspecs(module_or_class)
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57 <.PluginManager.add_hookspecs>`.
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58 You can register plugin objects (which contain hooks) by calling
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59 :py:meth:`register(plugin) <.PluginManager.register>`. The :py:class:`.PluginManager`
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60 is initialized with a prefix that is searched for in the names of the dict
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61 of registered plugin objects.
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62
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63 For debugging purposes you can call :py:meth:`.PluginManager.enable_tracing`
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64 which will subsequently send debug information to the trace helper.
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65 """
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66
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67 def __init__(self, project_name, implprefix=None):
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68 """If ``implprefix`` is given implementation functions
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69 will be recognized if their name matches the ``implprefix``. """
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70 self.project_name = project_name
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71 self._name2plugin = {}
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72 self._plugin2hookcallers = {}
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73 self._plugin_distinfo = []
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74 self.trace = _tracing.TagTracer().get("pluginmanage")
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75 self.hook = _HookRelay()
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76 if implprefix is not None:
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77 warnings.warn(
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78 "Support for the `implprefix` arg is now deprecated and will "
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79 "be removed in an upcoming release. Please use HookimplMarker.",
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80 DeprecationWarning,
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81 stacklevel=2,
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82 )
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83 self._implprefix = implprefix
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84 self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
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85 methods,
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86 kwargs,
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87 firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
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88 )
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89
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90 def _hookexec(self, hook, methods, kwargs):
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91 # called from all hookcaller instances.
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92 # enable_tracing will set its own wrapping function at self._inner_hookexec
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93 return self._inner_hookexec(hook, methods, kwargs)
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94
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95 def register(self, plugin, name=None):
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96 """ Register a plugin and return its canonical name or ``None`` if the name
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97 is blocked from registering. Raise a :py:class:`ValueError` if the plugin
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98 is already registered. """
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99 plugin_name = name or self.get_canonical_name(plugin)
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100
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101 if plugin_name in self._name2plugin or plugin in self._plugin2hookcallers:
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102 if self._name2plugin.get(plugin_name, -1) is None:
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103 return # blocked plugin, return None to indicate no registration
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104 raise ValueError(
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105 "Plugin already registered: %s=%s\n%s"
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106 % (plugin_name, plugin, self._name2plugin)
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107 )
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108
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109 # XXX if an error happens we should make sure no state has been
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110 # changed at point of return
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111 self._name2plugin[plugin_name] = plugin
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112
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113 # register matching hook implementations of the plugin
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114 self._plugin2hookcallers[plugin] = hookcallers = []
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115 for name in dir(plugin):
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116 hookimpl_opts = self.parse_hookimpl_opts(plugin, name)
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117 if hookimpl_opts is not None:
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118 normalize_hookimpl_opts(hookimpl_opts)
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119 method = getattr(plugin, name)
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120 hookimpl = HookImpl(plugin, plugin_name, method, hookimpl_opts)
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121 hook = getattr(self.hook, name, None)
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122 if hook is None:
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123 hook = _HookCaller(name, self._hookexec)
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124 setattr(self.hook, name, hook)
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125 elif hook.has_spec():
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126 self._verify_hook(hook, hookimpl)
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127 hook._maybe_apply_history(hookimpl)
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128 hook._add_hookimpl(hookimpl)
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129 hookcallers.append(hook)
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130 return plugin_name
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131
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132 def parse_hookimpl_opts(self, plugin, name):
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133 method = getattr(plugin, name)
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134 if not inspect.isroutine(method):
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135 return
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136 try:
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137 res = getattr(method, self.project_name + "_impl", None)
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138 except Exception:
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139 res = {}
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140 if res is not None and not isinstance(res, dict):
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141 # false positive
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142 res = None
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143 # TODO: remove when we drop implprefix in 1.0
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144 elif res is None and self._implprefix and name.startswith(self._implprefix):
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145 _warn_for_function(
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146 DeprecationWarning(
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147 "The `implprefix` system is deprecated please decorate "
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148 "this function using an instance of HookimplMarker."
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149 ),
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150 method,
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151 )
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152 res = {}
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153 return res
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154
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155 def unregister(self, plugin=None, name=None):
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156 """ unregister a plugin object and all its contained hook implementations
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157 from internal data structures. """
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158 if name is None:
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159 assert plugin is not None, "one of name or plugin needs to be specified"
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160 name = self.get_name(plugin)
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161
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162 if plugin is None:
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163 plugin = self.get_plugin(name)
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164
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165 # if self._name2plugin[name] == None registration was blocked: ignore
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166 if self._name2plugin.get(name):
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167 del self._name2plugin[name]
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168
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169 for hookcaller in self._plugin2hookcallers.pop(plugin, []):
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170 hookcaller._remove_plugin(plugin)
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171
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172 return plugin
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173
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174 def set_blocked(self, name):
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175 """ block registrations of the given name, unregister if already registered. """
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176 self.unregister(name=name)
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177 self._name2plugin[name] = None
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178
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179 def is_blocked(self, name):
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180 """ return ``True`` if the given plugin name is blocked. """
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181 return name in self._name2plugin and self._name2plugin[name] is None
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182
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183 def add_hookspecs(self, module_or_class):
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184 """ add new hook specifications defined in the given ``module_or_class``.
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185 Functions are recognized if they have been decorated accordingly. """
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186 names = []
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187 for name in dir(module_or_class):
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188 spec_opts = self.parse_hookspec_opts(module_or_class, name)
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189 if spec_opts is not None:
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190 hc = getattr(self.hook, name, None)
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191 if hc is None:
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192 hc = _HookCaller(name, self._hookexec, module_or_class, spec_opts)
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193 setattr(self.hook, name, hc)
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194 else:
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195 # plugins registered this hook without knowing the spec
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196 hc.set_specification(module_or_class, spec_opts)
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197 for hookfunction in hc.get_hookimpls():
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198 self._verify_hook(hc, hookfunction)
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199 names.append(name)
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200
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201 if not names:
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202 raise ValueError(
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203 "did not find any %r hooks in %r" % (self.project_name, module_or_class)
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204 )
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205
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206 def parse_hookspec_opts(self, module_or_class, name):
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207 method = getattr(module_or_class, name)
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208 return getattr(method, self.project_name + "_spec", None)
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209
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210 def get_plugins(self):
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211 """ return the set of registered plugins. """
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212 return set(self._plugin2hookcallers)
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213
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214 def is_registered(self, plugin):
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215 """ Return ``True`` if the plugin is already registered. """
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216 return plugin in self._plugin2hookcallers
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217
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218 def get_canonical_name(self, plugin):
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219 """ Return canonical name for a plugin object. Note that a plugin
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220 may be registered under a different name which was specified
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221 by the caller of :py:meth:`register(plugin, name) <.PluginManager.register>`.
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222 To obtain the name of an registered plugin use :py:meth:`get_name(plugin)
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223 <.PluginManager.get_name>` instead."""
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224 return getattr(plugin, "__name__", None) or str(id(plugin))
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225
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226 def get_plugin(self, name):
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227 """ Return a plugin or ``None`` for the given name. """
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228 return self._name2plugin.get(name)
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229
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230 def has_plugin(self, name):
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231 """ Return ``True`` if a plugin with the given name is registered. """
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232 return self.get_plugin(name) is not None
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233
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234 def get_name(self, plugin):
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235 """ Return name for registered plugin or ``None`` if not registered. """
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236 for name, val in self._name2plugin.items():
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237 if plugin == val:
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238 return name
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239
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240 def _verify_hook(self, hook, hookimpl):
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241 if hook.is_historic() and hookimpl.hookwrapper:
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242 raise PluginValidationError(
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243 hookimpl.plugin,
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244 "Plugin %r\nhook %r\nhistoric incompatible to hookwrapper"
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245 % (hookimpl.plugin_name, hook.name),
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246 )
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247 if hook.spec.warn_on_impl:
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248 _warn_for_function(hook.spec.warn_on_impl, hookimpl.function)
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249 # positional arg checking
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250 notinspec = set(hookimpl.argnames) - set(hook.spec.argnames)
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251 if notinspec:
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252 raise PluginValidationError(
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253 hookimpl.plugin,
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254 "Plugin %r for hook %r\nhookimpl definition: %s\n"
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255 "Argument(s) %s are declared in the hookimpl but "
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256 "can not be found in the hookspec"
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257 % (
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258 hookimpl.plugin_name,
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259 hook.name,
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260 _formatdef(hookimpl.function),
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261 notinspec,
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262 ),
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263 )
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264
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265 def check_pending(self):
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266 """ Verify that all hooks which have not been verified against
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267 a hook specification are optional, otherwise raise :py:class:`.PluginValidationError`."""
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268 for name in self.hook.__dict__:
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269 if name[0] != "_":
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270 hook = getattr(self.hook, name)
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271 if not hook.has_spec():
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272 for hookimpl in hook.get_hookimpls():
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273 if not hookimpl.optionalhook:
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274 raise PluginValidationError(
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275 hookimpl.plugin,
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276 "unknown hook %r in plugin %r"
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277 % (name, hookimpl.plugin),
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278 )
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279
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280 def load_setuptools_entrypoints(self, group, name=None):
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281 """ Load modules from querying the specified setuptools ``group``.
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282
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283 :param str group: entry point group to load plugins
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284 :param str name: if given, loads only plugins with the given ``name``.
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285 :rtype: int
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286 :return: return the number of loaded plugins by this call.
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287 """
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288 count = 0
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289 for dist in importlib_metadata.distributions():
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290 for ep in dist.entry_points:
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291 if (
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292 ep.group != group
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293 or (name is not None and ep.name != name)
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294 # already registered
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295 or self.get_plugin(ep.name)
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296 or self.is_blocked(ep.name)
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297 ):
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298 continue
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299 plugin = ep.load()
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300 self.register(plugin, name=ep.name)
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301 self._plugin_distinfo.append((plugin, DistFacade(dist)))
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302 count += 1
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303 return count
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304
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305 def list_plugin_distinfo(self):
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306 """ return list of distinfo/plugin tuples for all setuptools registered
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307 plugins. """
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308 return list(self._plugin_distinfo)
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309
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310 def list_name_plugin(self):
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311 """ return list of name/plugin pairs. """
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312 return list(self._name2plugin.items())
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313
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314 def get_hookcallers(self, plugin):
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315 """ get all hook callers for the specified plugin. """
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316 return self._plugin2hookcallers.get(plugin)
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317
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318 def add_hookcall_monitoring(self, before, after):
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319 """ add before/after tracing functions for all hooks
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320 and return an undo function which, when called,
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321 will remove the added tracers.
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322
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323 ``before(hook_name, hook_impls, kwargs)`` will be called ahead
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324 of all hook calls and receive a hookcaller instance, a list
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325 of HookImpl instances and the keyword arguments for the hook call.
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326
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327 ``after(outcome, hook_name, hook_impls, kwargs)`` receives the
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328 same arguments as ``before`` but also a :py:class:`pluggy.callers._Result` object
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329 which represents the result of the overall hook call.
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330 """
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331 oldcall = self._inner_hookexec
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332
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333 def traced_hookexec(hook, hook_impls, kwargs):
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334 before(hook.name, hook_impls, kwargs)
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335 outcome = _Result.from_call(lambda: oldcall(hook, hook_impls, kwargs))
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336 after(outcome, hook.name, hook_impls, kwargs)
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337 return outcome.get_result()
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338
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339 self._inner_hookexec = traced_hookexec
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340
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341 def undo():
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342 self._inner_hookexec = oldcall
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343
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344 return undo
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345
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346 def enable_tracing(self):
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347 """ enable tracing of hook calls and return an undo function. """
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348 hooktrace = self.trace.root.get("hook")
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349
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350 def before(hook_name, methods, kwargs):
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351 hooktrace.root.indent += 1
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352 hooktrace(hook_name, kwargs)
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353
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354 def after(outcome, hook_name, methods, kwargs):
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355 if outcome.excinfo is None:
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356 hooktrace("finish", hook_name, "-->", outcome.get_result())
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357 hooktrace.root.indent -= 1
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358
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359 return self.add_hookcall_monitoring(before, after)
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360
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361 def subset_hook_caller(self, name, remove_plugins):
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362 """ Return a new :py:class:`.hooks._HookCaller` instance for the named method
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363 which manages calls to all registered plugins except the
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364 ones from remove_plugins. """
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365 orig = getattr(self.hook, name)
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366 plugins_to_remove = [plug for plug in remove_plugins if hasattr(plug, name)]
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367 if plugins_to_remove:
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368 hc = _HookCaller(
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369 orig.name, orig._hookexec, orig.spec.namespace, orig.spec.opts
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370 )
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371 for hookimpl in orig.get_hookimpls():
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372 plugin = hookimpl.plugin
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373 if plugin not in plugins_to_remove:
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374 hc._add_hookimpl(hookimpl)
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375 # we also keep track of this hook caller so it
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376 # gets properly removed on plugin unregistration
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377 self._plugin2hookcallers.setdefault(plugin, []).append(hc)
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378 return hc
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379 return orig
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380
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381
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382 if hasattr(inspect, "signature"):
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383
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384 def _formatdef(func):
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385 return "%s%s" % (func.__name__, str(inspect.signature(func)))
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386
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387
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388 else:
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389
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390 def _formatdef(func):
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391 return "%s%s" % (
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392 func.__name__,
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393 inspect.formatargspec(*inspect.getargspec(func)),
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394 )