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Merge pull request #549 from LonamiWebs/file-cache

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227
telethon/telegram_bare_client.py
View File

@ -3,19 +3,16 @@ import os
import threading
import warnings
from datetime import timedelta, datetime
from hashlib import md5
from io import BytesIO
from signal import signal, SIGINT, SIGTERM, SIGABRT
from threading import Lock
from time import sleep
from . import helpers as utils, version
from .crypto import rsa, CdnDecrypter
from . import version
from .crypto import rsa
from .errors import (
RPCError, BrokenAuthKeyError, ServerError,
FloodWaitError, FloodTestPhoneWaitError, FileMigrateError,
TypeNotFoundError, UnauthorizedError, PhoneMigrateError,
NetworkMigrateError, UserMigrateError
RPCError, BrokenAuthKeyError, ServerError, FloodWaitError,
FloodTestPhoneWaitError, TypeNotFoundError, UnauthorizedError,
PhoneMigrateError, NetworkMigrateError, UserMigrateError
)
from .network import authenticator, MtProtoSender, Connection, ConnectionMode
from .tl import TLObject, Session
@ -30,15 +27,8 @@ from .tl.functions.help import (
GetCdnConfigRequest, GetConfigRequest
)
from .tl.functions.updates import GetStateRequest
from .tl.functions.upload import (
GetFileRequest, SaveBigFilePartRequest, SaveFilePartRequest
)
from .tl.types import InputFile, InputFileBig
from .tl.types.auth import ExportedAuthorization
from .tl.types.upload import FileCdnRedirect
from .update_state import UpdateState
from .utils import get_appropriated_part_size
DEFAULT_DC_ID = 4
DEFAULT_IPV4_IP = '149.154.167.51'
@ -565,213 +555,6 @@ class TelegramBareClient:
# endregion
# region Uploading media
def upload_file(self,
file,
part_size_kb=None,
file_name=None,
allow_cache=True,
progress_callback=None):
"""Uploads the specified file and returns a handle (an instance
of InputFile or InputFileBig, as required) which can be later used.
Uploading a file will simply return a "handle" to the file stored
remotely in the Telegram servers, which can be later used on. This
will NOT upload the file to your own chat.
'file' may be either a file path, a byte array, or a stream.
Note that if the file is a stream it will need to be read
entirely into memory to tell its size first.
If 'progress_callback' is not None, it should be a function that
takes two parameters, (bytes_uploaded, total_bytes).
Default values for the optional parameters if left as None are:
part_size_kb = get_appropriated_part_size(file_size)
file_name = os.path.basename(file_path)
"""
if isinstance(file, (InputFile, InputFileBig)):
return file # Already uploaded
if isinstance(file, str):
file_size = os.path.getsize(file)
elif isinstance(file, bytes):
file_size = len(file)
else:
file = file.read()
file_size = len(file)
# File will now either be a string or bytes
if not part_size_kb:
part_size_kb = get_appropriated_part_size(file_size)
if part_size_kb > 512:
raise ValueError('The part size must be less or equal to 512KB')
part_size = int(part_size_kb * 1024)
if part_size % 1024 != 0:
raise ValueError('The part size must be evenly divisible by 1024')
# Set a default file name if None was specified
file_id = utils.generate_random_long()
if not file_name:
if isinstance(file, str):
file_name = os.path.basename(file)
else:
file_name = str(file_id)
# Determine whether the file is too big (over 10MB) or not
# Telegram does make a distinction between smaller or larger files
is_large = file_size > 10 * 1024 * 1024
if not is_large:
# Calculate the MD5 hash before anything else.
# As this needs to be done always for small files,
# might as well do it before anything else and
# check the cache.
if isinstance(file, str):
with open(file, 'rb') as stream:
file = stream.read()
hash_md5 = md5(file)
tuple_ = self.session.get_file(hash_md5.digest(), file_size)
if tuple_ and allow_cache:
__log__.info('File was already cached, not uploading again')
return InputFile(name=file_name,
md5_checksum=tuple_[0], id=tuple_[2], parts=tuple_[3])
elif tuple_ and not allow_cache:
self.session.clear_file(hash_md5.digest(), file_size)
else:
hash_md5 = None
part_count = (file_size + part_size - 1) // part_size
__log__.info('Uploading file of %d bytes in %d chunks of %d',
file_size, part_count, part_size)
with open(file, 'rb') if isinstance(file, str) else BytesIO(file) \
as stream:
for part_index in range(part_count):
# Read the file by in chunks of size part_size
part = stream.read(part_size)
# The SavePartRequest is different depending on whether
# the file is too large or not (over or less than 10MB)
if is_large:
request = SaveBigFilePartRequest(file_id, part_index,
part_count, part)
else:
request = SaveFilePartRequest(file_id, part_index, part)
result = self(request)
if result:
__log__.debug('Uploaded %d/%d', part_index + 1, part_count)
if progress_callback:
progress_callback(stream.tell(), file_size)
else:
raise RuntimeError(
'Failed to upload file part {}.'.format(part_index))
if is_large:
return InputFileBig(file_id, part_count, file_name)
else:
self.session.cache_file(
hash_md5.digest(), file_size, file_id, part_count)
return InputFile(file_id, part_count, file_name,
md5_checksum=hash_md5.hexdigest())
# endregion
# region Downloading media
def download_file(self,
input_location,
file,
part_size_kb=None,
file_size=None,
progress_callback=None):
"""Downloads the given InputFileLocation to file (a stream or str).
If 'progress_callback' is not None, it should be a function that
takes two parameters, (bytes_downloaded, total_bytes). Note that
'total_bytes' simply equals 'file_size', and may be None.
"""
if not part_size_kb:
if not file_size:
part_size_kb = 64 # Reasonable default
else:
part_size_kb = get_appropriated_part_size(file_size)
part_size = int(part_size_kb * 1024)
# https://core.telegram.org/api/files says:
# > part_size % 1024 = 0 (divisible by 1KB)
#
# But https://core.telegram.org/cdn (more recent) says:
# > limit must be divisible by 4096 bytes
# So we just stick to the 4096 limit.
if part_size % 4096 != 0:
raise ValueError('The part size must be evenly divisible by 4096.')
if isinstance(file, str):
# Ensure that we'll be able to download the media
utils.ensure_parent_dir_exists(file)
f = open(file, 'wb')
else:
f = file
# The used client will change if FileMigrateError occurs
client = self
cdn_decrypter = None
__log__.info('Downloading file in chunks of %d bytes', part_size)
try:
offset = 0
while True:
try:
if cdn_decrypter:
result = cdn_decrypter.get_file()
else:
result = client(GetFileRequest(
input_location, offset, part_size
))
if isinstance(result, FileCdnRedirect):
__log__.info('File lives in a CDN')
cdn_decrypter, result = \
CdnDecrypter.prepare_decrypter(
client, self._get_cdn_client(result), result
)
except FileMigrateError as e:
__log__.info('File lives in another DC')
client = self._get_exported_client(e.new_dc)
continue
offset += part_size
# If we have received no data (0 bytes), the file is over
# So there is nothing left to download and write
if not result.bytes:
# Return some extra information, unless it's a CDN file
return getattr(result, 'type', '')
f.write(result.bytes)
__log__.debug('Saved %d more bytes', len(result.bytes))
if progress_callback:
progress_callback(f.tell(), file_size)
finally:
if client != self:
client.disconnect()
if cdn_decrypter:
try:
cdn_decrypter.client.disconnect()
except:
pass
if isinstance(file, str):
f.close()
# endregion
# region Updates handling
def sync_updates(self):

366
telethon/telegram_client.py
View File

@ -1,11 +1,21 @@
import hashlib
import itertools
import logging
import os
import sys
import time
from collections import OrderedDict, UserList
from datetime import datetime, timedelta
from io import BytesIO
from mimetypes import guess_type
from .crypto import CdnDecrypter
from .tl.custom import InputSizedFile
from .tl.functions.upload import (
SaveBigFilePartRequest, SaveFilePartRequest, GetFileRequest
)
from .tl.types.upload import FileCdnRedirect
try:
import socks
except ImportError:
@ -16,7 +26,8 @@ from . import helpers, utils
from .errors import (
RPCError, UnauthorizedError, PhoneCodeEmptyError, PhoneCodeExpiredError,
PhoneCodeHashEmptyError, PhoneCodeInvalidError, LocationInvalidError,
SessionPasswordNeededError, FilePartMissingError)
SessionPasswordNeededError, FileMigrateError
)
from .network import ConnectionMode
from .tl import TLObject
from .tl.custom import Draft, Dialog
@ -55,11 +66,14 @@ from .tl.types import (
UpdateNewChannelMessage, UpdateNewMessage, UpdateShortSentMessage,
PeerUser, InputPeerUser, InputPeerChat, InputPeerChannel, MessageEmpty,
ChatInvite, ChatInviteAlready, PeerChannel, Photo, InputPeerSelf,
InputSingleMedia, InputMediaPhoto, InputPhoto
InputSingleMedia, InputMediaPhoto, InputPhoto, InputFile, InputFileBig,
InputDocument, InputMediaDocument
)
from .tl.types.messages import DialogsSlice
from .extensions import markdown
__log__ = logging.getLogger(__name__)
class TelegramClient(TelegramBareClient):
"""
@ -862,7 +876,9 @@ class TelegramClient(TelegramBareClient):
allow_cache (:obj:`bool`, optional):
Whether to allow using the cached version stored in the
database or not. Defaults to ``True`` to avoid reuploads.
database or not. Defaults to ``True`` to avoid re-uploads.
Must be ``False`` if you wish to use different attributes
or thumb than those that were used when the file was cached.
Kwargs:
If "is_voice_note" in kwargs, despite its value, and the file is
@ -879,8 +895,7 @@ class TelegramClient(TelegramBareClient):
if all(utils.is_image(x) for x in file):
return self._send_album(
entity, file, caption=caption,
progress_callback=progress_callback, reply_to=reply_to,
allow_cache=allow_cache
progress_callback=progress_callback, reply_to=reply_to
)
# Not all are images, so send all the files one by one
return [
@ -892,10 +907,20 @@ class TelegramClient(TelegramBareClient):
) for x in file
]
as_image = utils.is_image(file) and not force_document
use_cache = InputPhoto if as_image else InputDocument
file_handle = self.upload_file(
file, progress_callback=progress_callback, allow_cache=allow_cache)
file, progress_callback=progress_callback,
use_cache=use_cache if allow_cache else None
)
if utils.is_image(file) and not force_document:
if isinstance(file_handle, use_cache):
# File was cached, so an instance of use_cache was returned
if as_image:
media = InputMediaPhoto(file_handle, caption)
else:
media = InputMediaDocument(file_handle, caption)
elif as_image:
media = InputMediaUploadedPhoto(file_handle, caption)
else:
mime_type = None
@ -951,19 +976,18 @@ class TelegramClient(TelegramBareClient):
media=media,
reply_to_msg_id=self._get_reply_to(reply_to)
)
try:
return self._get_response_message(request, self(request))
except FilePartMissingError:
# After a while, cached files are invalidated and this
# error is raised. The file needs to be uploaded again.
if not allow_cache:
raise
return self.send_file(
entity, file, allow_cache=False,
caption=caption, force_document=force_document,
progress_callback=progress_callback, reply_to=reply_to,
attributes=attributes, thumb=thumb, **kwargs
)
msg = self._get_response_message(request, self(request))
if msg and isinstance(file_handle, InputSizedFile):
# There was a response message and we didn't use cached
# version, so cache whatever we just sent to the database.
md5, size = file_handle.md5, file_handle.size
if as_image:
to_cache = utils.get_input_photo(msg.media.photo)
else:
to_cache = utils.get_input_document(msg.media.document)
self.session.cache_file(md5, size, to_cache)
return msg
def send_voice_note(self, entity, file, caption='', progress_callback=None,
reply_to=None):
@ -974,41 +998,172 @@ class TelegramClient(TelegramBareClient):
is_voice_note=()) # empty tuple is enough
def _send_album(self, entity, files, caption='',
progress_callback=None, reply_to=None,
allow_cache=True):
progress_callback=None, reply_to=None):
"""Specialized version of .send_file for albums"""
# We don't care if the user wants to avoid cache, we will use it
# anyway. Why? The cached version will be exactly the same thing
# we need to produce right now to send albums (uploadMedia), and
# cache only makes a difference for documents where the user may
# want the attributes used on them to change. Caption's ignored.
entity = self.get_input_entity(entity)
reply_to = self._get_reply_to(reply_to)
try:
# Need to upload the media first
media = [
self(UploadMediaRequest(entity, InputMediaUploadedPhoto(
self.upload_file(file, allow_cache=allow_cache),
caption=caption
)))
for file in files
]
# Now we can construct the multi-media request
result = self(SendMultiMediaRequest(
entity, reply_to_msg_id=reply_to, multi_media=[
InputSingleMedia(InputMediaPhoto(
InputPhoto(m.photo.id, m.photo.access_hash),
caption=caption
))
for m in media
]
))
return [
self._get_response_message(update.id, result)
for update in result.updates
if isinstance(update, UpdateMessageID)
]
except FilePartMissingError:
if not allow_cache:
raise
return self._send_album(
entity, files, allow_cache=False, caption=caption,
progress_callback=progress_callback, reply_to=reply_to
# Need to upload the media first, but only if they're not cached yet
media = []
for file in files:
# fh will either be InputPhoto or a modified InputFile
fh = self.upload_file(file, use_cache=InputPhoto)
if not isinstance(fh, InputPhoto):
input_photo = utils.get_input_photo(self(UploadMediaRequest(
entity, media=InputMediaUploadedPhoto(fh, caption)
)).photo)
self.session.cache_file(fh.md5, fh.size, input_photo)
fh = input_photo
media.append(InputSingleMedia(InputMediaPhoto(fh, caption)))
# Now we can construct the multi-media request
result = self(SendMultiMediaRequest(
entity, reply_to_msg_id=reply_to, multi_media=media
))
return [
self._get_response_message(update.id, result)
for update in result.updates
if isinstance(update, UpdateMessageID)
]
def upload_file(self,
file,
part_size_kb=None,
file_name=None,
use_cache=None,
progress_callback=None):
"""
Uploads the specified file and returns a handle (an instance of
InputFile or InputFileBig, as required) which can be later used
before it expires (they are usable during less than a day).
Uploading a file will simply return a "handle" to the file stored
remotely in the Telegram servers, which can be later used on. This
will **not** upload the file to your own chat or any chat at all.
Args:
file (:obj:`str` | :obj:`bytes` | :obj:`file`):
The path of the file, byte array, or stream that will be sent.
Note that if a byte array or a stream is given, a filename
or its type won't be inferred, and it will be sent as an
"unnamed application/octet-stream".
Subsequent calls with the very same file will result in
immediate uploads, unless ``.clear_file_cache()`` is called.
part_size_kb (:obj:`int`, optional):
Chunk size when uploading files. The larger, the less
requests will be made (up to 512KB maximum).
file_name (:obj:`str`, optional):
The file name which will be used on the resulting InputFile.
If not specified, the name will be taken from the ``file``
and if this is not a ``str``, it will be ``"unnamed"``.
use_cache (:obj:`type`, optional):
The type of cache to use (currently either ``InputDocument``
or ``InputPhoto``). If present and the file is small enough
to need the MD5, it will be checked against the database,
and if a match is found, the upload won't be made. Instead,
an instance of type ``use_cache`` will be returned.
progress_callback (:obj:`callable`, optional):
A callback function accepting two parameters:
``(sent bytes, total)``.
Returns:
``InputFileBig`` if the file size is larger than 10MB,
``InputSizedFile`` (subclass of ``InputFile``) otherwise.
"""
if isinstance(file, (InputFile, InputFileBig)):
return file # Already uploaded
if isinstance(file, str):
file_size = os.path.getsize(file)
elif isinstance(file, bytes):
file_size = len(file)
else:
file = file.read()
file_size = len(file)
# File will now either be a string or bytes
if not part_size_kb:
part_size_kb = utils.get_appropriated_part_size(file_size)
if part_size_kb > 512:
raise ValueError('The part size must be less or equal to 512KB')
part_size = int(part_size_kb * 1024)
if part_size % 1024 != 0:
raise ValueError(
'The part size must be evenly divisible by 1024')
# Set a default file name if None was specified
file_id = helpers.generate_random_long()
if not file_name:
if isinstance(file, str):
file_name = os.path.basename(file)
else:
file_name = str(file_id)
# Determine whether the file is too big (over 10MB) or not
# Telegram does make a distinction between smaller or larger files
is_large = file_size > 10 * 1024 * 1024
hash_md5 = hashlib.md5()
if not is_large:
# Calculate the MD5 hash before anything else.
# As this needs to be done always for small files,
# might as well do it before anything else and
# check the cache.
if isinstance(file, str):
with open(file, 'rb') as stream:
file = stream.read()
hash_md5.update(file)
if use_cache:
cached = self.session.get_file(
hash_md5.digest(), file_size, cls=use_cache
)
if cached:
return cached
part_count = (file_size + part_size - 1) // part_size
__log__.info('Uploading file of %d bytes in %d chunks of %d',
file_size, part_count, part_size)
with open(file, 'rb') if isinstance(file, str) else BytesIO(file) \
as stream:
for part_index in range(part_count):
# Read the file by in chunks of size part_size
part = stream.read(part_size)
# The SavePartRequest is different depending on whether
# the file is too large or not (over or less than 10MB)
if is_large:
request = SaveBigFilePartRequest(file_id, part_index,
part_count, part)
else:
request = SaveFilePartRequest(file_id, part_index, part)
result = self(request)
if result:
__log__.debug('Uploaded %d/%d', part_index + 1,
part_count)
if progress_callback:
progress_callback(stream.tell(), file_size)
else:
raise RuntimeError(
'Failed to upload file part {}.'.format(part_index))
if is_large:
return InputFileBig(file_id, part_count, file_name)
else:
return InputSizedFile(
file_id, part_count, file_name, md5=hash_md5, size=file_size
)
# endregion
@ -1292,6 +1447,113 @@ class TelegramClient(TelegramBareClient):
return result
i += 1
def download_file(self,
input_location,
file,
part_size_kb=None,
file_size=None,
progress_callback=None):
"""
Downloads the given input location to a file.
Args:
input_location (:obj:`InputFileLocation`):
The file location from which the file will be downloaded.
file (:obj:`str` | :obj:`file`, optional):
The output file path, directory, or stream-like object.
If the path exists and is a file, it will be overwritten.
part_size_kb (:obj:`int`, optional):
Chunk size when downloading files. The larger, the less
requests will be made (up to 512KB maximum).
file_size (:obj:`int`, optional):
The file size that is about to be downloaded, if known.
Only used if ``progress_callback`` is specified.
progress_callback (:obj:`callable`, optional):
A callback function accepting two parameters:
``(downloaded bytes, total)``. Note that the
``total`` is the provided ``file_size``.
"""
if not part_size_kb:
if not file_size:
part_size_kb = 64 # Reasonable default
else:
part_size_kb = utils.get_appropriated_part_size(file_size)
part_size = int(part_size_kb * 1024)
# https://core.telegram.org/api/files says:
# > part_size % 1024 = 0 (divisible by 1KB)
#
# But https://core.telegram.org/cdn (more recent) says:
# > limit must be divisible by 4096 bytes
# So we just stick to the 4096 limit.
if part_size % 4096 != 0:
raise ValueError(
'The part size must be evenly divisible by 4096.')
if isinstance(file, str):
# Ensure that we'll be able to download the media
helpers.ensure_parent_dir_exists(file)
f = open(file, 'wb')
else:
f = file
# The used client will change if FileMigrateError occurs
client = self
cdn_decrypter = None
__log__.info('Downloading file in chunks of %d bytes', part_size)
try:
offset = 0
while True:
try:
if cdn_decrypter:
result = cdn_decrypter.get_file()
else:
result = client(GetFileRequest(
input_location, offset, part_size
))
if isinstance(result, FileCdnRedirect):
__log__.info('File lives in a CDN')
cdn_decrypter, result = \
CdnDecrypter.prepare_decrypter(
client, self._get_cdn_client(result),
result
)
except FileMigrateError as e:
__log__.info('File lives in another DC')
client = self._get_exported_client(e.new_dc)
continue
offset += part_size
# If we have received no data (0 bytes), the file is over
# So there is nothing left to download and write
if not result.bytes:
# Return some extra information, unless it's a CDN file
return getattr(result, 'type', '')
f.write(result.bytes)
__log__.debug('Saved %d more bytes', len(result.bytes))
if progress_callback:
progress_callback(f.tell(), file_size)
finally:
if client != self:
client.disconnect()
if cdn_decrypter:
try:
cdn_decrypter.client.disconnect()
except:
pass
if isinstance(file, str):
f.close()
# endregion
# endregion

1
telethon/tl/custom/__init__.py
View File

@ -1,2 +1,3 @@
from .draft import Draft
from .dialog import Dialog
from .input_sized_file import InputSizedFile

9
telethon/tl/custom/input_sized_file.py Normal file
View File

@ -0,0 +1,9 @@
from ..types import InputFile
class InputSizedFile(InputFile):
"""InputFile class with two extra parameters: md5 (digest) and size"""
def __init__(self, id_, parts, name, md5, size):
super().__init__(id_, parts, name, md5.hexdigest())
self.md5 = md5.digest()
self.size = size

84
telethon/tl/session.py
View File

@ -5,6 +5,7 @@ import sqlite3
import struct
import time
from base64 import b64decode
from enum import Enum
from os.path import isfile as file_exists
from threading import Lock
@ -12,11 +13,26 @@ from .. import utils
from ..tl import TLObject
from ..tl.types import (
PeerUser, PeerChat, PeerChannel,
InputPeerUser, InputPeerChat, InputPeerChannel
InputPeerUser, InputPeerChat, InputPeerChannel,
InputPhoto, InputDocument
)
EXTENSION = '.session'
CURRENT_VERSION = 2 # database version
CURRENT_VERSION = 3 # database version
class _SentFileType(Enum):
DOCUMENT = 0
PHOTO = 1
@staticmethod
def from_type(cls):
if cls == InputDocument:
return _SentFileType.DOCUMENT
elif cls == InputPhoto:
return _SentFileType.PHOTO
else:
raise ValueError('The cls must be either InputDocument/InputPhoto')
class Session:
@ -130,9 +146,10 @@ class Session:
"""sent_files (
md5_digest blob,
file_size integer,
file_id integer,
part_count integer,
primary key(md5_digest, file_size)
type integer,
id integer,
hash integer,
primary key(md5_digest, file_size, type)
)"""
)
c.execute("insert into version values (?)", (CURRENT_VERSION,))
@ -171,18 +188,22 @@ class Session:
def _upgrade_database(self, old):
c = self._conn.cursor()
if old == 1:
self._create_table(c,"""sent_files (
md5_digest blob,
file_size integer,
file_id integer,
part_count integer,
primary key(md5_digest, file_size)
)""")
old = 2
# old == 1 doesn't have the old sent_files so no need to drop
if old == 2:
# Old cache from old sent_files lasts then a day anyway, drop
c.execute('drop table sent_files')
self._create_table(c, """sent_files (
md5_digest blob,
file_size integer,
type integer,
id integer,
hash integer,
primary key(md5_digest, file_size, type)
)""")
c.close()
def _create_table(self, c, *definitions):
@staticmethod
def _create_table(c, *definitions):
"""
Creates a table given its definition 'name (columns).
If the sqlite version is >= 3.8.2, it will use "without rowid".
@ -420,24 +441,25 @@ class Session:
# File processing
def get_file(self, md5_digest, file_size):
return self._conn.execute(
'select * from sent_files '
'where md5_digest = ? and file_size = ?', (md5_digest, file_size)
def get_file(self, md5_digest, file_size, cls):
tuple_ = self._conn.execute(
'select id, hash from sent_files '
'where md5_digest = ? and file_size = ? and type = ?',
(md5_digest, file_size, _SentFileType.from_type(cls).value)
).fetchone()
if tuple_:
# Both allowed classes have (id, access_hash) as parameters
return cls(tuple_[0], tuple_[1])
def cache_file(self, md5_digest, file_size, instance):
if not isinstance(instance, (InputDocument, InputPhoto)):
raise TypeError('Cannot cache %s instance' % type(instance))
def cache_file(self, md5_digest, file_size, file_id, part_count):
with self._db_lock:
self._conn.execute(
'insert into sent_files values (?,?,?,?)',
(md5_digest, file_size, file_id, part_count)
)
self.save()
def clear_file(self, md5_digest, file_size):
with self._db_lock:
self._conn.execute(
'delete from sent_files where '
'md5_digest = ? and file_size = ?', (md5_digest, file_size)
)
'insert or replace into sent_files values (?,?,?,?,?)', (
md5_digest, file_size,
_SentFileType.from_type(type(instance)).value,
instance.id, instance.access_hash
))
self.save()