Mercurial > libervia-backend
annotate sat/bridge/bridge_constructor/base_constructor.py @ 2886:b06cb71079fa
core (xmpp): new networkEnabled() and networkDisabled() methods:
those methods can be called by platform specific plugins when network is known to be (un)available. This way, connection attempts can be cancelled when no network is available, saving resources (notably battery on mobile devices), or attempts can be restarted immediately when network is known to be available again.
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Sat, 06 Apr 2019 19:05:57 +0200 |
| parents | 003b8b4b56a7 |
| children | ab2696e34d29 |
| rev | line source |
|---|---|
| 2085 | 1 #!/usr/bin/env python2 |
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2 # -*- coding: utf-8 -*- |
| 2085 | 3 |
| 4 # SàT: a XMPP client | |
| 2771 | 5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org) |
| 2085 | 6 |
| 7 # This program is free software: you can redistribute it and/or modify | |
| 8 # it under the terms of the GNU Affero General Public License as published by | |
| 9 # the Free Software Foundation, either version 3 of the License, or | |
| 10 # (at your option) any later version. | |
| 11 | |
| 12 # This program is distributed in the hope that it will be useful, | |
| 13 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 # GNU Affero General Public License for more details. | |
| 16 | |
| 17 # You should have received a copy of the GNU Affero General Public License | |
| 18 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | |
| 20 """base constructor class""" | |
| 21 | |
| 22 from sat.bridge.bridge_constructor.constants import Const as C | |
| 23 from ConfigParser import NoOptionError | |
| 24 import sys | |
| 25 import os | |
| 26 import os.path | |
| 27 import re | |
| 28 from importlib import import_module | |
| 29 | |
| 30 | |
| 31 class ParseError(Exception): | |
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32 # Used when the signature parsing is going wrong (invalid signature ?) |
| 2085 | 33 pass |
| 34 | |
| 35 | |
| 36 class Constructor(object): | |
| 37 NAME = None # used in arguments parsing, filename will be used if not set | |
| 38 # following attribute are used by default generation method | |
| 39 # they can be set to dict of strings using python formatting syntax | |
| 40 # dict keys will be used to select part to replace (e.g. "signals" key will | |
| 41 # replace ##SIGNALS_PART## in template), while the value is the format | |
| 42 # keys starting with "signal" will be used for signals, while ones starting with | |
| 43 # "method" will be used for methods | |
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44 # check D-Bus constructor for an example |
| 2085 | 45 CORE_FORMATS = None |
| 46 CORE_TEMPLATE = None | |
| 47 CORE_DEST = None | |
| 48 FRONTEND_FORMATS = None | |
| 49 FRONTEND_TEMPLATE = None | |
| 50 FRONTEND_DEST = None | |
| 51 | |
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52 # set to False if your bridge need only core |
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53 FRONTEND_ACTIVATE = True |
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54 |
| 2085 | 55 def __init__(self, bridge_template, options): |
| 56 self.bridge_template = bridge_template | |
| 57 self.args = options | |
| 58 | |
| 59 @property | |
| 60 def constructor_dir(self): | |
| 61 constructor_mod = import_module(self.__module__) | |
| 62 return os.path.dirname(constructor_mod.__file__) | |
| 63 | |
| 64 def getValues(self, name): | |
| 65 """Return values of a function in a dict | |
| 66 @param name: Name of the function to get | |
| 67 @return: dict, each key has the config value or None if the value is not set""" | |
| 68 function = {} | |
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69 for option in ["type", "category", "sig_in", "sig_out", "doc"]: |
| 2085 | 70 try: |
| 71 value = self.bridge_template.get(name, option) | |
| 72 except NoOptionError: | |
| 73 value = None | |
| 74 function[option] = value | |
| 75 return function | |
| 76 | |
| 77 def getDefault(self, name): | |
| 78 """Return default values of a function in a dict | |
| 79 @param name: Name of the function to get | |
| 80 @return: dict, each key is the integer param number (no key if no default value)""" | |
| 81 default_dict = {} | |
| 82 def_re = re.compile(r"param_(\d+)_default") | |
| 83 | |
| 84 for option in self.bridge_template.options(name): | |
| 85 match = def_re.match(option) | |
| 86 if match: | |
| 87 try: | |
| 88 idx = int(match.group(1)) | |
| 89 except ValueError: | |
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90 raise ParseError( |
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91 "Invalid value [%s] for parameter number" % match.group(1) |
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92 ) |
| 2085 | 93 default_dict[idx] = self.bridge_template.get(name, option) |
| 94 | |
| 95 return default_dict | |
| 96 | |
| 97 def getFlags(self, name): | |
| 98 """Return list of flags set for this function | |
| 99 | |
| 100 @param name: Name of the function to get | |
| 101 @return: List of flags (string) | |
| 102 """ | |
| 103 flags = [] | |
| 104 for option in self.bridge_template.options(name): | |
| 105 if option in C.DECLARATION_FLAGS: | |
| 106 flags.append(option) | |
| 107 return flags | |
| 108 | |
| 109 def getArgumentsDoc(self, name): | |
| 110 """Return documentation of arguments | |
| 111 @param name: Name of the function to get | |
| 112 @return: dict, each key is the integer param number (no key if no argument doc), value is a tuple (name, doc)""" | |
| 113 doc_dict = {} | |
| 114 option_re = re.compile(r"doc_param_(\d+)") | |
| 115 value_re = re.compile(r"^(\w+): (.*)$", re.MULTILINE | re.DOTALL) | |
| 116 for option in self.bridge_template.options(name): | |
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117 if option == "doc_return": |
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118 doc_dict["return"] = self.bridge_template.get(name, option) |
| 2085 | 119 continue |
| 120 match = option_re.match(option) | |
| 121 if match: | |
| 122 try: | |
| 123 idx = int(match.group(1)) | |
| 124 except ValueError: | |
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125 raise ParseError( |
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126 "Invalid value [%s] for parameter number" % match.group(1) |
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127 ) |
| 2085 | 128 value_match = value_re.match(self.bridge_template.get(name, option)) |
| 129 if not value_match: | |
| 130 raise ParseError("Invalid value for parameter doc [%i]" % idx) | |
| 131 doc_dict[idx] = (value_match.group(1), value_match.group(2)) | |
| 132 return doc_dict | |
| 133 | |
| 134 def getDoc(self, name): | |
| 135 """Return documentation of the method | |
| 136 @param name: Name of the function to get | |
| 137 @return: string documentation, or None""" | |
| 138 if self.bridge_template.has_option(name, "doc"): | |
| 139 return self.bridge_template.get(name, "doc") | |
| 140 return None | |
| 141 | |
| 142 def argumentsParser(self, signature): | |
| 143 """Generator which return individual arguments signatures from a global signature""" | |
| 144 start = 0 | |
| 145 i = 0 | |
| 146 | |
| 147 while i < len(signature): | |
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148 if signature[i] not in ["b", "y", "n", "i", "x", "q", "u", "t", "d", "s", |
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149 "a"]: |
| 2085 | 150 raise ParseError("Unmanaged attribute type [%c]" % signature[i]) |
| 151 | |
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152 if signature[i] == "a": |
| 2085 | 153 i += 1 |
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154 if ( |
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155 signature[i] != "{" and signature[i] != "(" |
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156 ): # FIXME: must manage tuples out of arrays |
| 2085 | 157 i += 1 |
| 158 yield signature[start:i] | |
| 159 start = i | |
| 160 continue # we have a simple type for the array | |
| 161 opening_car = signature[i] | |
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162 assert opening_car in ["{", "("] |
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163 closing_car = "}" if opening_car == "{" else ")" |
| 2085 | 164 opening_count = 1 |
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165 while True: # we have a dict or a list of tuples |
| 2085 | 166 i += 1 |
| 167 if i >= len(signature): | |
| 168 raise ParseError("missing }") | |
| 169 if signature[i] == opening_car: | |
| 170 opening_count += 1 | |
| 171 if signature[i] == closing_car: | |
| 172 opening_count -= 1 | |
| 173 if opening_count == 0: | |
| 174 break | |
| 175 i += 1 | |
| 176 yield signature[start:i] | |
| 177 start = i | |
| 178 | |
| 179 def getArguments(self, signature, name=None, default=None, unicode_protect=False): | |
| 180 """Return arguments to user given a signature | |
| 181 | |
| 182 @param signature: signature in the short form (using s,a,i,b etc) | |
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183 @param name: dictionary of arguments name like given by getArgumentsDoc |
| 2085 | 184 @param default: dictionary of default values, like given by getDefault |
| 185 @param unicode_protect: activate unicode protection on strings (return strings as unicode(str)) | |
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186 @return (str): arguments that correspond to a signature (e.g.: "sss" return "arg1, arg2, arg3") |
| 2085 | 187 """ |
| 188 idx = 0 | |
| 189 attr_string = [] | |
| 190 | |
| 191 for arg in self.argumentsParser(signature): | |
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192 attr_string.append( |
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193 ( |
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194 "unicode(%(name)s)%(default)s" |
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195 if (unicode_protect and arg == "s") |
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196 else "%(name)s%(default)s" |
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197 ) |
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198 % { |
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199 "name": name[idx][0] if (name and idx in name) else "arg_%i" % idx, |
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200 "default": "=" + default[idx] if (default and idx in default) else "", |
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201 } |
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202 ) |
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203 # give arg_1, arg2, etc or name1, name2=default, etc. |
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204 # give unicode(arg_1), unicode(arg_2), etc. if unicode_protect is set and arg is a string |
| 2085 | 205 idx += 1 |
| 206 | |
| 207 return ", ".join(attr_string) | |
| 208 | |
| 209 def getTemplatePath(self, template_file): | |
| 210 """return template path corresponding to file name | |
| 211 | |
| 212 @param template_file(str): name of template file | |
| 213 """ | |
| 214 return os.path.join(self.constructor_dir, template_file) | |
| 215 | |
| 216 def core_completion_method(self, completion, function, default, arg_doc, async_): | |
| 217 """override this method to extend completion""" | |
| 218 pass | |
| 219 | |
| 220 def core_completion_signal(self, completion, function, default, arg_doc, async_): | |
| 221 """override this method to extend completion""" | |
| 222 pass | |
| 223 | |
| 224 def frontend_completion_method(self, completion, function, default, arg_doc, async_): | |
| 225 """override this method to extend completion""" | |
| 226 pass | |
| 227 | |
| 228 def frontend_completion_signal(self, completion, function, default, arg_doc, async_): | |
| 229 """override this method to extend completion""" | |
| 230 pass | |
| 231 | |
| 232 def generate(self, side): | |
| 233 """generate bridge | |
| 234 | |
| 235 call generateCoreSide or generateFrontendSide if they exists | |
| 236 else call generic self._generate method | |
| 237 """ | |
| 238 try: | |
| 239 if side == "core": | |
| 240 method = self.generateCoreSide | |
| 241 elif side == "frontend": | |
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242 if not self.FRONTEND_ACTIVATE: |
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243 print(u"This constructor only handle core, please use core side") |
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244 sys.exit(1) |
| 2085 | 245 method = self.generateFrontendSide |
| 246 except AttributeError: | |
| 247 self._generate(side) | |
| 248 else: | |
| 249 method() | |
| 250 | |
| 251 def _generate(self, side): | |
| 252 """generate the backend | |
| 253 | |
| 254 this is a generic method which will use formats found in self.CORE_SIGNAL_FORMAT | |
| 255 and self.CORE_METHOD_FORMAT (standard format method will be used) | |
| 256 @param side(str): core or frontend | |
| 257 """ | |
| 258 side_vars = [] | |
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259 for var in ("FORMATS", "TEMPLATE", "DEST"): |
| 2085 | 260 attr = "{}_{}".format(side.upper(), var) |
| 261 value = getattr(self, attr) | |
| 262 if value is None: | |
| 263 raise NotImplementedError | |
| 264 side_vars.append(value) | |
| 265 | |
| 266 FORMATS, TEMPLATE, DEST = side_vars | |
| 267 del side_vars | |
| 268 | |
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269 parts = {part.upper(): [] for part in FORMATS} |
| 2085 | 270 sections = self.bridge_template.sections() |
| 271 sections.sort() | |
| 272 for section in sections: | |
| 273 function = self.getValues(section) | |
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274 print("Adding %s %s" % (section, function["type"])) |
| 2085 | 275 default = self.getDefault(section) |
| 276 arg_doc = self.getArgumentsDoc(section) | |
| 277 async_ = "async" in self.getFlags(section) | |
| 278 completion = { | |
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279 "sig_in": function["sig_in"] or "", |
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280 "sig_out": function["sig_out"] or "", |
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281 "category": "plugin" if function["category"] == "plugin" else "core", |
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282 "name": section, |
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283 # arguments with default values |
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284 "args": self.getArguments( |
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285 function["sig_in"], name=arg_doc, default=default |
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286 ), |
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287 } |
| 2085 | 288 |
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289 extend_method = getattr( |
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290 self, "{}_completion_{}".format(side, function["type"]) |
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291 ) |
| 2085 | 292 extend_method(completion, function, default, arg_doc, async_) |
| 293 | |
| 294 for part, fmt in FORMATS.iteritems(): | |
| 295 if part.startswith(function["type"]): | |
| 296 parts[part.upper()].append(fmt.format(**completion)) | |
| 297 | |
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298 # at this point, signals_part, methods_part and direct_calls should be filled, |
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299 # we just have to place them in the right part of the template |
| 2085 | 300 bridge = [] |
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301 const_override = { |
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302 env[len(C.ENV_OVERRIDE) :]: v |
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303 for env, v in os.environ.iteritems() |
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304 if env.startswith(C.ENV_OVERRIDE) |
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305 } |
| 2085 | 306 template_path = self.getTemplatePath(TEMPLATE) |
| 307 try: | |
| 308 with open(template_path) as template: | |
| 309 for line in template: | |
| 310 | |
| 311 for part, extend_list in parts.iteritems(): | |
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312 if line.startswith("##{}_PART##".format(part)): |
| 2085 | 313 bridge.extend(extend_list) |
| 314 break | |
| 315 else: | |
| 316 # the line is not a magic part replacement | |
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317 if line.startswith("const_"): |
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318 const_name = line[len("const_") : line.find(" = ")].strip() |
| 2085 | 319 if const_name in const_override: |
| 320 print("const {} overriden".format(const_name)) | |
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321 bridge.append( |
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322 "const_{} = {}".format( |
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323 const_name, const_override[const_name] |
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324 ) |
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325 ) |
| 2085 | 326 continue |
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327 bridge.append(line.replace("\n", "")) |
| 2085 | 328 except IOError: |
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329 print("can't open template file [{}]".format(template_path)) |
| 2085 | 330 sys.exit(1) |
| 331 | |
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332 # now we write to final file |
| 2085 | 333 self.finalWrite(DEST, bridge) |
| 334 | |
| 335 def finalWrite(self, filename, file_buf): | |
| 336 """Write the final generated file in [dest dir]/filename | |
| 337 | |
| 338 @param filename: name of the file to generate | |
| 339 @param file_buf: list of lines (stings) of the file | |
| 340 """ | |
| 341 if os.path.exists(self.args.dest_dir) and not os.path.isdir(self.args.dest_dir): | |
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342 print( |
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343 "The destination dir [%s] can't be created: a file with this name already exists !" |
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344 ) |
| 2085 | 345 sys.exit(1) |
| 346 try: | |
| 347 if not os.path.exists(self.args.dest_dir): | |
| 348 os.mkdir(self.args.dest_dir) | |
| 349 full_path = os.path.join(self.args.dest_dir, filename) | |
| 350 if os.path.exists(full_path) and not self.args.force: | |
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351 print( |
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352 "The destination file [%s] already exists ! Use --force to overwrite it" |
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353 % full_path |
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354 ) |
| 2085 | 355 try: |
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356 with open(full_path, "w") as dest_file: |
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357 dest_file.write("\n".join(file_buf)) |
| 2085 | 358 except IOError: |
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359 print("Can't open destination file [%s]" % full_path) |
| 2085 | 360 except OSError: |
| 361 print("It's not possible to generate the file, check your permissions") | |
| 362 exit(1) |