mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-11-27 20:03:46 +03:00
706 lines
28 KiB
Python
706 lines
28 KiB
Python
import os
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import re
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import shutil
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import struct
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from zlib import crc32
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from collections import defaultdict
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from .parser import SourceBuilder, TLParser, TLObject
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AUTO_GEN_NOTICE = \
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'"""File generated by TLObjects\' generator. All changes will be ERASED"""'
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class TLGenerator:
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def __init__(self, output_dir):
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self.output_dir = output_dir
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def _get_file(self, *paths):
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return os.path.join(self.output_dir, *paths)
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def _rm_if_exists(self, filename):
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file = self._get_file(filename)
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if os.path.exists(file):
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if os.path.isdir(file):
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shutil.rmtree(file)
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else:
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os.remove(file)
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def tlobjects_exist(self):
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"""Determines whether the TLObjects were previously
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generated (hence exist) or not
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"""
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return os.path.isfile(self._get_file('all_tlobjects.py'))
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def clean_tlobjects(self):
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"""Cleans the automatically generated TLObjects from disk"""
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for name in ('functions', 'types', 'all_tlobjects.py'):
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self._rm_if_exists(name)
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def generate_tlobjects(self, scheme_file, import_depth):
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"""Generates all the TLObjects from scheme.tl to
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tl/functions and tl/types
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"""
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# First ensure that the required parent directories exist
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os.makedirs(self._get_file('functions'), exist_ok=True)
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os.makedirs(self._get_file('types'), exist_ok=True)
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# Step 0: Cache the parsed file on a tuple
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tlobjects = tuple(TLParser.parse_file(scheme_file, ignore_core=True))
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# Step 1: Group everything by {namespace: [tlobjects]} so we can
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# easily generate __init__.py files with all the TLObjects on them.
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namespace_functions = defaultdict(list)
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namespace_types = defaultdict(list)
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# Make use of this iteration to also store 'Type: [Constructors]',
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# used when generating the documentation for the classes.
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type_constructors = defaultdict(list)
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for tlobject in tlobjects:
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if tlobject.is_function:
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namespace_functions[tlobject.namespace].append(tlobject)
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else:
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namespace_types[tlobject.namespace].append(tlobject)
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type_constructors[tlobject.result].append(tlobject)
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# Step 2: Generate the actual code
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self._write_init_py(
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self._get_file('functions'), import_depth,
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namespace_functions, type_constructors
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)
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self._write_init_py(
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self._get_file('types'), import_depth,
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namespace_types, type_constructors
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)
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# Step 4: Once all the objects have been generated,
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# we can now group them in a single file
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filename = os.path.join(self._get_file('all_tlobjects.py'))
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with open(filename, 'w', encoding='utf-8') as file:
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with SourceBuilder(file) as builder:
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builder.writeln(AUTO_GEN_NOTICE)
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builder.writeln()
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builder.writeln('from . import types, functions')
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builder.writeln()
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# Create a constant variable to indicate which layer this is
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builder.writeln('LAYER = {}'.format(
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TLParser.find_layer(scheme_file))
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)
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builder.writeln()
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# Then create the dictionary containing constructor_id: class
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builder.writeln('tlobjects = {')
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builder.current_indent += 1
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# Fill the dictionary (0x1a2b3c4f: tl.full.type.path.Class)
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for tlobject in tlobjects:
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constructor = hex(tlobject.id)
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if len(constructor) != 10:
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# Make it a nice length 10 so it fits well
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constructor = '0x' + constructor[2:].zfill(8)
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builder.write('{}: '.format(constructor))
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builder.write(
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'functions' if tlobject.is_function else 'types')
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if tlobject.namespace:
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builder.write('.' + tlobject.namespace)
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builder.writeln('.{},'.format(tlobject.class_name()))
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builder.current_indent -= 1
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builder.writeln('}')
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@staticmethod
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def _write_init_py(out_dir, depth, namespace_tlobjects, type_constructors):
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# namespace_tlobjects: {'namespace', [TLObject]}
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os.makedirs(out_dir, exist_ok=True)
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for ns, tlobjects in namespace_tlobjects.items():
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file = os.path.join(out_dir, ns + '.py' if ns else '__init__.py')
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with open(file, 'w', encoding='utf-8') as f, \
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SourceBuilder(f) as builder:
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builder.writeln(AUTO_GEN_NOTICE)
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# Both types and functions inherit from the TLObject class
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# so they all can be serialized and sent, however, only the
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# functions are "content_related".
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builder.writeln(
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'from {}.tl.tlobject import TLObject'.format('.' * depth)
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)
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# Add the relative imports to the namespaces,
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# unless we already are in a namespace.
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if not ns:
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builder.writeln('from . import {}'.format(', '.join(
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x for x in namespace_tlobjects.keys() if x
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)))
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# Import 'get_input_*' utils
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# TODO Support them on types too
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if 'functions' in out_dir:
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builder.writeln(
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'from {}.utils import get_input_peer, '
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'get_input_channel, get_input_user, '
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'get_input_media, get_input_photo'.format('.' * depth)
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)
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# Import 'os' for those needing access to 'os.urandom()'
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# Currently only 'random_id' needs 'os' to be imported,
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# for all those TLObjects with arg.can_be_inferred.
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builder.writeln('import os')
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# Import struct for the .__bytes__(self) serialization
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builder.writeln('import struct')
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# Generate the class for every TLObject
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for t in sorted(tlobjects, key=lambda x: x.name):
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TLGenerator._write_source_code(
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t, builder, depth, type_constructors
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)
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builder.current_indent = 0
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@staticmethod
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def _write_source_code(tlobject, builder, depth, type_constructors):
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"""Writes the source code corresponding to the given TLObject
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by making use of the 'builder' SourceBuilder.
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Additional information such as file path depth and
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the Type: [Constructors] must be given for proper
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importing and documentation strings.
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"""
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builder.writeln()
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builder.writeln()
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builder.writeln('class {}(TLObject):'.format(tlobject.class_name()))
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# Class-level variable to store its Telegram's constructor ID
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builder.writeln('CONSTRUCTOR_ID = {}'.format(hex(tlobject.id)))
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builder.writeln('SUBCLASS_OF_ID = {}'.format(
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hex(crc32(tlobject.result.encode('ascii'))))
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)
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builder.writeln()
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# Flag arguments must go last
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args = [
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a for a in tlobject.sorted_args()
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if not a.flag_indicator and not a.generic_definition
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]
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# Convert the args to string parameters, flags having =None
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args = [
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(a.name if not a.is_flag and not a.can_be_inferred
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else '{}=None'.format(a.name))
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for a in args
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]
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# Write the __init__ function
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if args:
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builder.writeln(
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'def __init__(self, {}):'.format(', '.join(args))
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)
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else:
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builder.writeln('def __init__(self):')
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# Now update args to have the TLObject arguments, _except_
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# those which are calculated on send or ignored, this is
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# flag indicator and generic definitions.
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#
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# We don't need the generic definitions in Python
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# because arguments can be any type
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args = [arg for arg in tlobject.args
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if not arg.flag_indicator and
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not arg.generic_definition]
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if args:
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# Write the docstring, to know the type of the args
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builder.writeln('"""')
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for arg in args:
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if not arg.flag_indicator:
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builder.writeln(':param {} {}:'.format(
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arg.type_hint(), arg.name
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))
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builder.current_indent -= 1 # It will auto-indent (':')
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# We also want to know what type this request returns
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# or to which type this constructor belongs to
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builder.writeln()
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if tlobject.is_function:
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builder.write(':returns {}: '.format(tlobject.result))
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else:
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builder.write('Constructor for {}: '.format(tlobject.result))
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constructors = type_constructors[tlobject.result]
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if not constructors:
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builder.writeln('This type has no constructors.')
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elif len(constructors) == 1:
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builder.writeln('Instance of {}.'.format(
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constructors[0].class_name()
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))
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else:
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builder.writeln('Instance of either {}.'.format(
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', '.join(c.class_name() for c in constructors)
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))
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builder.writeln('"""')
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builder.writeln('super().__init__()')
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# Functions have a result object and are confirmed by default
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if tlobject.is_function:
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builder.writeln('self.result = None')
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builder.writeln(
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'self.content_related = True')
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# Set the arguments
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if args:
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# Leave an empty line if there are any args
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builder.writeln()
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for arg in args:
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TLGenerator._write_self_assigns(builder, tlobject, arg, args)
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builder.end_block()
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# Write the to_dict(self) method
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builder.writeln('def to_dict(self, recursive=True):')
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if args:
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builder.writeln('return {')
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else:
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builder.write('return {')
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builder.current_indent += 1
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base_types = ('string', 'bytes', 'int', 'long', 'int128',
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'int256', 'double', 'Bool', 'true', 'date')
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for arg in args:
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builder.write("'{}': ".format(arg.name))
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if arg.type in base_types:
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if arg.is_vector:
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builder.write('[] if self.{0} is None else self.{0}[:]'
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.format(arg.name))
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else:
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builder.write('self.{}'.format(arg.name))
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else:
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if arg.is_vector:
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builder.write(
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'([] if self.{0} is None else [None'
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' if x is None else x.to_dict() for x in self.{0}]'
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') if recursive else self.{0}'.format(arg.name)
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)
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else:
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builder.write(
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'(None if self.{0} is None else self.{0}.to_dict())'
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' if recursive else self.{0}'.format(arg.name)
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)
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builder.writeln(',')
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builder.current_indent -= 1
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builder.writeln("}")
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builder.end_block()
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# Write the .__bytes__() function
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builder.writeln('def __bytes__(self):')
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# Some objects require more than one flag parameter to be set
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# at the same time. In this case, add an assertion.
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repeated_args = defaultdict(list)
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for arg in tlobject.args:
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if arg.is_flag:
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repeated_args[arg.flag_index].append(arg)
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for ra in repeated_args.values():
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if len(ra) > 1:
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cnd1 = ('self.{}'.format(a.name) for a in ra)
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cnd2 = ('not self.{}'.format(a.name) for a in ra)
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builder.writeln(
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"assert ({}) or ({}), '{} parameters must all "
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"be False-y (like None) or all me True-y'".format(
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' and '.join(cnd1), ' and '.join(cnd2),
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', '.join(a.name for a in ra)
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)
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)
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builder.writeln("return b''.join((")
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builder.current_indent += 1
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# First constructor code, we already know its bytes
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builder.writeln('{},'.format(repr(struct.pack('<I', tlobject.id))))
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for arg in tlobject.args:
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if TLGenerator.write_to_bytes(builder, arg, tlobject.args):
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builder.writeln(',')
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builder.current_indent -= 1
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builder.writeln('))')
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builder.end_block()
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# Write the static from_reader(reader) function
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builder.writeln('@staticmethod')
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builder.writeln('def from_reader(reader):')
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for arg in tlobject.args:
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TLGenerator.write_read_code(
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builder, arg, tlobject.args, name='_' + arg.name
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)
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builder.writeln('return {}({})'.format(
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tlobject.class_name(), ', '.join(
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'{0}=_{0}'.format(a.name) for a in tlobject.sorted_args()
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if not a.flag_indicator and not a.generic_definition
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)
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))
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builder.end_block()
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# Only requests can have a different response that's not their
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# serialized body, that is, we'll be setting their .result.
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if tlobject.is_function:
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builder.writeln('def on_response(self, reader):')
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TLGenerator.write_request_result_code(builder, tlobject)
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builder.end_block()
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# Write the __str__(self) and stringify(self) functions
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builder.writeln('def __str__(self):')
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builder.writeln('return TLObject.pretty_format(self)')
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builder.end_block()
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builder.writeln('def stringify(self):')
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builder.writeln('return TLObject.pretty_format(self, indent=0)')
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# builder.end_block() # No need to end the last block
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@staticmethod
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def _write_self_assigns(builder, tlobject, arg, args):
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if arg.can_be_inferred:
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# Currently the only argument that can be
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# inferred are those called 'random_id'
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if arg.name == 'random_id':
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# Endianness doesn't really matter, and 'big' is shorter
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code = "int.from_bytes(os.urandom({}), 'big', signed=True)"\
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.format(8 if arg.type == 'long' else 4)
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if arg.is_vector:
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# Currently for the case of "messages.forwardMessages"
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# Ensure we can infer the length from id:Vector<>
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if not next(a for a in args if a.name == 'id').is_vector:
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raise ValueError(
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'Cannot infer list of random ids for ', tlobject
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)
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code = '[{} for _ in range(len(id))]'.format(code)
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builder.writeln(
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"self.random_id = random_id if random_id "
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"is not None else {}".format(code)
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)
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else:
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raise ValueError('Cannot infer a value for ', arg)
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# Well-known cases, auto-cast it to the right type
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elif arg.type == 'InputPeer' and tlobject.is_function:
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TLGenerator.write_get_input(builder, arg, 'get_input_peer')
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elif arg.type == 'InputChannel' and tlobject.is_function:
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TLGenerator.write_get_input(builder, arg, 'get_input_channel')
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elif arg.type == 'InputUser' and tlobject.is_function:
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TLGenerator.write_get_input(builder, arg, 'get_input_user')
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elif arg.type == 'InputMedia' and tlobject.is_function:
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TLGenerator.write_get_input(builder, arg, 'get_input_media')
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elif arg.type == 'InputPhoto' and tlobject.is_function:
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TLGenerator.write_get_input(builder, arg, 'get_input_photo')
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else:
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builder.writeln('self.{0} = {0}'.format(arg.name))
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@staticmethod
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def write_get_input(builder, arg, get_input_code):
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"""Returns "True" if the get_input_* code was written when assigning
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a parameter upon creating the request. Returns False otherwise
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"""
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if arg.is_vector:
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builder.write('self.{0} = [{1}(_x) for _x in {0}]'
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.format(arg.name, get_input_code))
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else:
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builder.write('self.{0} = {1}({0})'
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.format(arg.name, get_input_code))
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builder.writeln(
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' if {} else None'.format(arg.name) if arg.is_flag else ''
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)
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@staticmethod
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def get_file_name(tlobject, add_extension=False):
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"""Gets the file name in file_name_format.py for the given TLObject"""
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# Courtesy of http://stackoverflow.com/a/1176023/4759433
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s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', tlobject.name)
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result = re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()
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if add_extension:
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return result + '.py'
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else:
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return result
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@staticmethod
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def write_to_bytes(builder, arg, args, name=None):
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"""
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Writes the .__bytes__() code for the given argument
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:param builder: The source code builder
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:param arg: The argument to write
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:param args: All the other arguments in TLObject same __bytes__.
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This is required to determine the flags value
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:param name: The name of the argument. Defaults to "self.argname"
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This argument is an option because it's required when
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writing Vectors<>
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"""
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if arg.generic_definition:
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return # Do nothing, this only specifies a later type
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if name is None:
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name = 'self.{}'.format(arg.name)
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# The argument may be a flag, only write if it's not None AND
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# if it's not a True type.
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# True types are not actually sent, but instead only used to
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# determine the flags.
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if arg.is_flag:
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if arg.type == 'true':
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return # Exit, since True type is never written
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elif arg.is_vector:
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# Vector flags are special since they consist of 3 values,
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# so we need an extra join here. Note that empty vector flags
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# should NOT be sent either!
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builder.write("b'' if not {} else b''.join((".format(name))
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else:
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builder.write("b'' if not {} else (".format(name))
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if arg.is_vector:
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if arg.use_vector_id:
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# vector code, unsigned 0x1cb5c415 as little endian
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builder.write(r"b'\x15\xc4\xb5\x1c',")
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builder.write("struct.pack('<i', len({})),".format(name))
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# Cannot unpack the values for the outer tuple through *[(
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# since that's a Python >3.5 feature, so add another join.
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builder.write("b''.join(")
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# Temporary disable .is_vector, not to enter this if again
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# Also disable .is_flag since it's not needed per element
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old_flag = arg.is_flag
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arg.is_vector = arg.is_flag = False
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TLGenerator.write_to_bytes(builder, arg, args, name='x')
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arg.is_vector = True
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arg.is_flag = old_flag
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builder.write(' for x in {})'.format(name))
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|
elif arg.flag_indicator:
|
|
# Calculate the flags with those items which are not None
|
|
builder.write("struct.pack('<I', {})".format(
|
|
' | '.join('({} if {} else 0)'.format(
|
|
1 << flag.flag_index, 'self.{}'.format(flag.name)
|
|
) for flag in args if flag.is_flag)
|
|
))
|
|
|
|
elif 'int' == arg.type:
|
|
# struct.pack is around 4 times faster than int.to_bytes
|
|
builder.write("struct.pack('<i', {})".format(name))
|
|
|
|
elif 'long' == arg.type:
|
|
builder.write("struct.pack('<q', {})".format(name))
|
|
|
|
elif 'int128' == arg.type:
|
|
builder.write("{}.to_bytes(16, 'little', signed=True)".format(name))
|
|
|
|
elif 'int256' == arg.type:
|
|
builder.write("{}.to_bytes(32, 'little', signed=True)".format(name))
|
|
|
|
elif 'double' == arg.type:
|
|
builder.write("struct.pack('<d', {})".format(name))
|
|
|
|
elif 'string' == arg.type:
|
|
builder.write('TLObject.serialize_bytes({})'.format(name))
|
|
|
|
elif 'Bool' == arg.type:
|
|
# 0x997275b5 if boolean else 0xbc799737
|
|
builder.write(
|
|
r"b'\xb5ur\x99' if {} else b'7\x97y\xbc'".format(name)
|
|
)
|
|
|
|
elif 'true' == arg.type:
|
|
pass # These are actually NOT written! Only used for flags
|
|
|
|
elif 'bytes' == arg.type:
|
|
builder.write('TLObject.serialize_bytes({})'.format(name))
|
|
|
|
elif 'date' == arg.type: # Custom format
|
|
# 0 if datetime is None else int(datetime.timestamp())
|
|
builder.write(
|
|
r"b'\0\0\0\0' if {0} is None else "
|
|
r"struct.pack('<I', int({0}.timestamp()))".format(name)
|
|
)
|
|
|
|
else:
|
|
# Else it may be a custom type
|
|
builder.write('bytes({})'.format(name))
|
|
|
|
if arg.is_flag:
|
|
builder.write(')')
|
|
if arg.is_vector:
|
|
builder.write(')') # We were using a tuple
|
|
|
|
return True # Something was written
|
|
|
|
@staticmethod
|
|
def write_read_code(builder, arg, args, name):
|
|
"""
|
|
Writes the read code for the given argument, setting the
|
|
arg.name variable to its read value.
|
|
|
|
:param builder: The source code builder
|
|
:param arg: The argument to write
|
|
:param args: All the other arguments in TLObject same on_send.
|
|
This is required to determine the flags value
|
|
:param name: The name of the argument. Defaults to "self.argname"
|
|
This argument is an option because it's required when
|
|
writing Vectors<>
|
|
"""
|
|
|
|
if arg.generic_definition:
|
|
return # Do nothing, this only specifies a later type
|
|
|
|
# The argument may be a flag, only write that flag was given!
|
|
was_flag = False
|
|
if arg.is_flag:
|
|
# Treat 'true' flags as a special case, since they're true if
|
|
# they're set, and nothing else needs to actually be read.
|
|
if 'true' == arg.type:
|
|
builder.writeln(
|
|
'{} = bool(flags & {})'.format(name, 1 << arg.flag_index)
|
|
)
|
|
return
|
|
|
|
was_flag = True
|
|
builder.writeln('if flags & {}:'.format(
|
|
1 << arg.flag_index
|
|
))
|
|
# Temporary disable .is_flag not to enter this if
|
|
# again when calling the method recursively
|
|
arg.is_flag = False
|
|
|
|
if arg.is_vector:
|
|
if arg.use_vector_id:
|
|
# We have to read the vector's constructor ID
|
|
builder.writeln("reader.read_int()")
|
|
|
|
builder.writeln('{} = []'.format(name))
|
|
builder.writeln('for _ in range(reader.read_int()):')
|
|
# Temporary disable .is_vector, not to enter this if again
|
|
arg.is_vector = False
|
|
TLGenerator.write_read_code(builder, arg, args, name='_x')
|
|
builder.writeln('{}.append(_x)'.format(name))
|
|
arg.is_vector = True
|
|
|
|
elif arg.flag_indicator:
|
|
# Read the flags, which will indicate what items we should read next
|
|
builder.writeln('flags = reader.read_int()')
|
|
builder.writeln()
|
|
|
|
elif 'int' == arg.type:
|
|
builder.writeln('{} = reader.read_int()'.format(name))
|
|
|
|
elif 'long' == arg.type:
|
|
builder.writeln('{} = reader.read_long()'.format(name))
|
|
|
|
elif 'int128' == arg.type:
|
|
builder.writeln(
|
|
'{} = reader.read_large_int(bits=128)'.format(name)
|
|
)
|
|
|
|
elif 'int256' == arg.type:
|
|
builder.writeln(
|
|
'{} = reader.read_large_int(bits=256)'.format(name)
|
|
)
|
|
|
|
elif 'double' == arg.type:
|
|
builder.writeln('{} = reader.read_double()'.format(name))
|
|
|
|
elif 'string' == arg.type:
|
|
builder.writeln('{} = reader.tgread_string()'.format(name))
|
|
|
|
elif 'Bool' == arg.type:
|
|
builder.writeln('{} = reader.tgread_bool()'.format(name))
|
|
|
|
elif 'true' == arg.type:
|
|
# Arbitrary not-None value, don't actually read "true" flags
|
|
builder.writeln('{} = True'.format(name))
|
|
|
|
elif 'bytes' == arg.type:
|
|
builder.writeln('{} = reader.tgread_bytes()'.format(name))
|
|
|
|
elif 'date' == arg.type: # Custom format
|
|
builder.writeln('{} = reader.tgread_date()'.format(name))
|
|
|
|
else:
|
|
# Else it may be a custom type
|
|
if not arg.skip_constructor_id:
|
|
builder.writeln('{} = reader.tgread_object()'.format(name))
|
|
else:
|
|
# Import the correct type inline to avoid cyclic imports.
|
|
# There may be better solutions so that we can just access
|
|
# all the types before the files have been parsed, but I
|
|
# don't know of any.
|
|
sep_index = arg.type.find('.')
|
|
if sep_index == -1:
|
|
ns, t = '.', arg.type
|
|
else:
|
|
ns, t = '.' + arg.type[:sep_index], arg.type[sep_index+1:]
|
|
class_name = TLObject.class_name_for(t)
|
|
|
|
# There would be no need to import the type if we're in the
|
|
# file with the same namespace, but since it does no harm
|
|
# and we don't have information about such thing in the
|
|
# method we just ignore that case.
|
|
builder.writeln('from {} import {}'.format(ns, class_name))
|
|
builder.writeln('{} = {}.from_reader(reader)'.format(
|
|
name, class_name
|
|
))
|
|
|
|
# End vector and flag blocks if required (if we opened them before)
|
|
if arg.is_vector:
|
|
builder.end_block()
|
|
|
|
if was_flag:
|
|
builder.current_indent -= 1
|
|
builder.writeln('else:')
|
|
builder.writeln('{} = None'.format(name))
|
|
builder.current_indent -= 1
|
|
# Restore .is_flag
|
|
arg.is_flag = True
|
|
|
|
@staticmethod
|
|
def write_request_result_code(builder, tlobject):
|
|
"""
|
|
Writes the receive code for the given function
|
|
|
|
:param builder: The source code builder
|
|
:param tlobject: The TLObject for which the 'self.result = '
|
|
will be written
|
|
"""
|
|
if tlobject.result.startswith('Vector<'):
|
|
# Vector results are a bit special since they can also be composed
|
|
# of integer values and such; however, the result of requests is
|
|
# not parsed as arguments are and it's a bit harder to tell which
|
|
# is which.
|
|
if tlobject.result == 'Vector<int>':
|
|
builder.writeln('reader.read_int() # Vector id')
|
|
builder.writeln('count = reader.read_int()')
|
|
builder.writeln(
|
|
'self.result = [reader.read_int() for _ in range(count)]'
|
|
)
|
|
elif tlobject.result == 'Vector<long>':
|
|
builder.writeln('reader.read_int() # Vector id')
|
|
builder.writeln('count = reader.read_long()')
|
|
builder.writeln(
|
|
'self.result = [reader.read_long() for _ in range(count)]'
|
|
)
|
|
else:
|
|
builder.writeln('self.result = reader.tgread_vector()')
|
|
else:
|
|
builder.writeln('self.result = reader.tgread_object()')
|