Mercurial > libervia-backend
annotate src/bridge/bridge_constructor/base_constructor.py @ 2248:a81261cee29b
jp (output/template): initialize template rendered only if a rendering is actually needed
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Sun, 21 May 2017 15:52:23 +0200 |
| parents | f413bfc24458 |
| children | 8b37a62336c3 |
| rev | line source |
|---|---|
| 2085 | 1 #!/usr/bin/env python2 |
| 2 #-*- coding: utf-8 -*- | |
| 3 | |
| 4 # SàT: a XMPP client | |
| 5 # Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org) | |
| 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): | |
| 32 #Used when the signature parsing is going wrong (invalid signature ?) | |
| 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 | |
| 44 # check D-Bus constructor for an example | |
| 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 = {} | |
| 69 for option in ['type', 'category', 'sig_in', 'sig_out', 'doc']: | |
| 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: | |
| 90 raise ParseError("Invalid value [%s] for parameter number" % match.group(1)) | |
| 91 default_dict[idx] = self.bridge_template.get(name, option) | |
| 92 | |
| 93 return default_dict | |
| 94 | |
| 95 def getFlags(self, name): | |
| 96 """Return list of flags set for this function | |
| 97 | |
| 98 @param name: Name of the function to get | |
| 99 @return: List of flags (string) | |
| 100 """ | |
| 101 flags = [] | |
| 102 for option in self.bridge_template.options(name): | |
| 103 if option in C.DECLARATION_FLAGS: | |
| 104 flags.append(option) | |
| 105 return flags | |
| 106 | |
| 107 def getArgumentsDoc(self, name): | |
| 108 """Return documentation of arguments | |
| 109 @param name: Name of the function to get | |
| 110 @return: dict, each key is the integer param number (no key if no argument doc), value is a tuple (name, doc)""" | |
| 111 doc_dict = {} | |
| 112 option_re = re.compile(r"doc_param_(\d+)") | |
| 113 value_re = re.compile(r"^(\w+): (.*)$", re.MULTILINE | re.DOTALL) | |
| 114 for option in self.bridge_template.options(name): | |
| 115 if option == 'doc_return': | |
| 116 doc_dict['return'] = self.bridge_template.get(name, option) | |
| 117 continue | |
| 118 match = option_re.match(option) | |
| 119 if match: | |
| 120 try: | |
| 121 idx = int(match.group(1)) | |
| 122 except ValueError: | |
| 123 raise ParseError("Invalid value [%s] for parameter number" % match.group(1)) | |
| 124 value_match = value_re.match(self.bridge_template.get(name, option)) | |
| 125 if not value_match: | |
| 126 raise ParseError("Invalid value for parameter doc [%i]" % idx) | |
| 127 doc_dict[idx] = (value_match.group(1), value_match.group(2)) | |
| 128 return doc_dict | |
| 129 | |
| 130 def getDoc(self, name): | |
| 131 """Return documentation of the method | |
| 132 @param name: Name of the function to get | |
| 133 @return: string documentation, or None""" | |
| 134 if self.bridge_template.has_option(name, "doc"): | |
| 135 return self.bridge_template.get(name, "doc") | |
| 136 return None | |
| 137 | |
| 138 def argumentsParser(self, signature): | |
| 139 """Generator which return individual arguments signatures from a global signature""" | |
| 140 start = 0 | |
| 141 i = 0 | |
| 142 | |
| 143 while i < len(signature): | |
| 144 if signature[i] not in ['b', 'y', 'n', 'i', 'x', 'q', 'u', 't', 'd', 's', 'a']: | |
| 145 raise ParseError("Unmanaged attribute type [%c]" % signature[i]) | |
| 146 | |
| 147 if signature[i] == 'a': | |
| 148 i += 1 | |
| 149 if signature[i] != '{' and signature[i] != '(': # FIXME: must manage tuples out of arrays | |
| 150 i += 1 | |
| 151 yield signature[start:i] | |
| 152 start = i | |
| 153 continue # we have a simple type for the array | |
| 154 opening_car = signature[i] | |
| 155 assert(opening_car in ['{', '(']) | |
| 156 closing_car = '}' if opening_car == '{' else ')' | |
| 157 opening_count = 1 | |
| 158 while (True): # we have a dict or a list of tuples | |
| 159 i += 1 | |
| 160 if i >= len(signature): | |
| 161 raise ParseError("missing }") | |
| 162 if signature[i] == opening_car: | |
| 163 opening_count += 1 | |
| 164 if signature[i] == closing_car: | |
| 165 opening_count -= 1 | |
| 166 if opening_count == 0: | |
| 167 break | |
| 168 i += 1 | |
| 169 yield signature[start:i] | |
| 170 start = i | |
| 171 | |
| 172 def getArguments(self, signature, name=None, default=None, unicode_protect=False): | |
| 173 """Return arguments to user given a signature | |
| 174 | |
| 175 @param signature: signature in the short form (using s,a,i,b etc) | |
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Goffi <goffi@goffi.org>
parents:
2085
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176 @param name: dictionary of arguments name like given by getArgumentsDoc |
| 2085 | 177 @param default: dictionary of default values, like given by getDefault |
| 178 @param unicode_protect: activate unicode protection on strings (return strings as unicode(str)) | |
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bridge, quick_frontend: preparation for async bridge
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179 @return (str): arguments that correspond to a signature (e.g.: "sss" return "arg1, arg2, arg3") |
| 2085 | 180 """ |
| 181 idx = 0 | |
| 182 attr_string = [] | |
| 183 | |
| 184 for arg in self.argumentsParser(signature): | |
| 185 attr_string.append(("unicode(%(name)s)%(default)s" if (unicode_protect and arg == 's') else "%(name)s%(default)s") % { | |
| 186 'name': name[idx][0] if (name and idx in name) else "arg_%i" % idx, | |
| 187 'default': "=" + default[idx] if (default and idx in default) else ''}) | |
| 188 # give arg_1, arg2, etc or name1, name2=default, etc. | |
| 189 #give unicode(arg_1), unicode(arg_2), etc. if unicode_protect is set and arg is a string | |
| 190 idx += 1 | |
| 191 | |
| 192 return ", ".join(attr_string) | |
| 193 | |
| 194 def getTemplatePath(self, template_file): | |
| 195 """return template path corresponding to file name | |
| 196 | |
| 197 @param template_file(str): name of template file | |
| 198 """ | |
| 199 return os.path.join(self.constructor_dir, template_file) | |
| 200 | |
| 201 def core_completion_method(self, completion, function, default, arg_doc, async_): | |
| 202 """override this method to extend completion""" | |
| 203 pass | |
| 204 | |
| 205 def core_completion_signal(self, completion, function, default, arg_doc, async_): | |
| 206 """override this method to extend completion""" | |
| 207 pass | |
| 208 | |
| 209 def frontend_completion_method(self, completion, function, default, arg_doc, async_): | |
| 210 """override this method to extend completion""" | |
| 211 pass | |
| 212 | |
| 213 def frontend_completion_signal(self, completion, function, default, arg_doc, async_): | |
| 214 """override this method to extend completion""" | |
| 215 pass | |
| 216 | |
| 217 | |
| 218 def generate(self, side): | |
| 219 """generate bridge | |
| 220 | |
| 221 call generateCoreSide or generateFrontendSide if they exists | |
| 222 else call generic self._generate method | |
| 223 """ | |
| 224 try: | |
| 225 if side == "core": | |
| 226 method = self.generateCoreSide | |
| 227 elif side == "frontend": | |
|
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bridge (constructor): embedded bridge generator:
Goffi <goffi@goffi.org>
parents:
2085
diff
changeset
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228 if not self.FRONTEND_ACTIVATE: |
|
159250d66407
bridge (constructor): embedded bridge generator:
Goffi <goffi@goffi.org>
parents:
2085
diff
changeset
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229 print(u"This constructor only handle core, please use core side") |
|
159250d66407
bridge (constructor): embedded bridge generator:
Goffi <goffi@goffi.org>
parents:
2085
diff
changeset
|
230 sys.exit(1) |
| 2085 | 231 method = self.generateFrontendSide |
| 232 except AttributeError: | |
| 233 self._generate(side) | |
| 234 else: | |
| 235 method() | |
| 236 | |
| 237 def _generate(self, side): | |
| 238 """generate the backend | |
| 239 | |
| 240 this is a generic method which will use formats found in self.CORE_SIGNAL_FORMAT | |
| 241 and self.CORE_METHOD_FORMAT (standard format method will be used) | |
| 242 @param side(str): core or frontend | |
| 243 """ | |
| 244 side_vars = [] | |
| 245 for var in ('FORMATS', 'TEMPLATE', 'DEST'): | |
| 246 attr = "{}_{}".format(side.upper(), var) | |
| 247 value = getattr(self, attr) | |
| 248 if value is None: | |
| 249 raise NotImplementedError | |
| 250 side_vars.append(value) | |
| 251 | |
| 252 FORMATS, TEMPLATE, DEST = side_vars | |
| 253 del side_vars | |
| 254 | |
| 255 parts = {part.upper():[] for part in FORMATS} | |
| 256 sections = self.bridge_template.sections() | |
| 257 sections.sort() | |
| 258 for section in sections: | |
| 259 function = self.getValues(section) | |
| 260 print ("Adding %s %s" % (section, function["type"])) | |
| 261 default = self.getDefault(section) | |
| 262 arg_doc = self.getArgumentsDoc(section) | |
| 263 async_ = "async" in self.getFlags(section) | |
| 264 completion = { | |
| 265 'sig_in': function['sig_in'] or '', | |
| 266 'sig_out': function['sig_out'] or '', | |
| 267 'category': 'plugin' if function['category'] == 'plugin' else 'core', | |
| 268 'name': section, | |
|
2087
159250d66407
bridge (constructor): embedded bridge generator:
Goffi <goffi@goffi.org>
parents:
2085
diff
changeset
|
269 # arguments with default values |
|
159250d66407
bridge (constructor): embedded bridge generator:
Goffi <goffi@goffi.org>
parents:
2085
diff
changeset
|
270 'args': self.getArguments(function['sig_in'], name=arg_doc, default=default), |
|
159250d66407
bridge (constructor): embedded bridge generator:
Goffi <goffi@goffi.org>
parents:
2085
diff
changeset
|
271 } |
| 2085 | 272 |
| 273 extend_method = getattr(self, "{}_completion_{}".format(side, function["type"])) | |
| 274 extend_method(completion, function, default, arg_doc, async_) | |
| 275 | |
| 276 for part, fmt in FORMATS.iteritems(): | |
| 277 if part.startswith(function["type"]): | |
| 278 parts[part.upper()].append(fmt.format(**completion)) | |
| 279 | |
| 280 | |
| 281 #at this point, signals_part, methods_part and direct_calls should be filled, | |
| 282 #we just have to place them in the right part of the template | |
| 283 bridge = [] | |
| 284 const_override = {env[len(C.ENV_OVERRIDE):]:v for env,v in os.environ.iteritems() if env.startswith(C.ENV_OVERRIDE)} | |
| 285 template_path = self.getTemplatePath(TEMPLATE) | |
| 286 try: | |
| 287 with open(template_path) as template: | |
| 288 for line in template: | |
| 289 | |
| 290 for part, extend_list in parts.iteritems(): | |
| 291 if line.startswith('##{}_PART##'.format(part)): | |
| 292 bridge.extend(extend_list) | |
| 293 break | |
| 294 else: | |
| 295 # the line is not a magic part replacement | |
| 296 if line.startswith('const_'): | |
| 297 const_name = line[len('const_'):line.find(' = ')].strip() | |
| 298 if const_name in const_override: | |
| 299 print("const {} overriden".format(const_name)) | |
| 300 bridge.append('const_{} = {}'.format(const_name, const_override[const_name])) | |
| 301 continue | |
| 302 bridge.append(line.replace('\n', '')) | |
| 303 except IOError: | |
| 304 print ("can't open template file [{}]".format(template_path)) | |
| 305 sys.exit(1) | |
| 306 | |
| 307 #now we write to final file | |
| 308 self.finalWrite(DEST, bridge) | |
| 309 | |
| 310 def finalWrite(self, filename, file_buf): | |
| 311 """Write the final generated file in [dest dir]/filename | |
| 312 | |
| 313 @param filename: name of the file to generate | |
| 314 @param file_buf: list of lines (stings) of the file | |
| 315 """ | |
| 316 if os.path.exists(self.args.dest_dir) and not os.path.isdir(self.args.dest_dir): | |
| 317 print ("The destination dir [%s] can't be created: a file with this name already exists !") | |
| 318 sys.exit(1) | |
| 319 try: | |
| 320 if not os.path.exists(self.args.dest_dir): | |
| 321 os.mkdir(self.args.dest_dir) | |
| 322 full_path = os.path.join(self.args.dest_dir, filename) | |
| 323 if os.path.exists(full_path) and not self.args.force: | |
| 324 print ("The destination file [%s] already exists ! Use --force to overwrite it" % full_path) | |
| 325 try: | |
| 326 with open(full_path, 'w') as dest_file: | |
| 327 dest_file.write('\n'.join(file_buf)) | |
| 328 except IOError: | |
| 329 print ("Can't open destination file [%s]" % full_path) | |
| 330 except OSError: | |
| 331 print("It's not possible to generate the file, check your permissions") | |
| 332 exit(1) |