Update examples to be async

readthedocs/telethon.client.rst

@@ -20,7 +20,7 @@ its own methods, which you all can use.
         # Now you can use all client methods listed below, like for example...
         await client.send_message('me', 'Hello to myself!')
 
-    asyncio.get_event_loop().run_until_complete()
+    asyncio.get_event_loop().run_until_complete(main())
 
 
 You **don't** need to import these `AuthMethods`, `MessageMethods`, etc.

telethon_examples/interactive_telegram_client.py

@@ -1,4 +1,6 @@
 import os
+import sys
+import asyncio
 from getpass import getpass
 
 from telethon.utils import get_display_name
@@ -6,9 +8,10 @@ from telethon.utils import get_display_name
 from telethon import TelegramClient, events
 from telethon.network import ConnectionTcpAbridged
 from telethon.errors import SessionPasswordNeededError
-from telethon.tl.types import (
+
-    PeerChat, UpdateShortChatMessage, UpdateShortMessage
+
-)
+# Create a global variable to hold the loop we will be using
+loop = asyncio.get_event_loop()
 
 
 def sprint(string, *args, **kwargs):
@@ -41,6 +44,16 @@ def bytes_to_string(byte_count):
     )
 
 
+async def async_input(prompt):
+    """
+    Python's ``input()`` is blocking, which means the event loop we set
+    above can't be running while we're blocking there. This method will
+    let the loop run while we wait for input.
+    """
+    print(prompt, end='', flush=True)
+    return (await loop.run_in_executor(None, sys.stdin.readline)).rstrip()
+
+
 class InteractiveTelegramClient(TelegramClient):
     """Full featured Telegram client, meant to be used on an interactive
        session to see what Telethon is capable off -
@@ -78,41 +91,37 @@ class InteractiveTelegramClient(TelegramClient):
             connection=ConnectionTcpAbridged,
 
             # If you're using a proxy, set it here.
-            proxy=proxy,
+            proxy=proxy
-
-            # If you want to receive updates, you need to start one or more
-            # "update workers" which are background threads that will allow
-            # you to run things when your update handlers (callbacks) are
-            # called with an Update object.
-            update_workers=1
         )
 
         # Store {message.id: message} map here so that we can download
         # media known the message ID, for every message having media.
         self.found_media = {}
 
-        # Calling .connect() may return False, so you need to assert it's
+        # Calling .connect() may raise a connection error False, so you need
-        # True before continuing. Otherwise you may want to retry as done here.
+        # to except those before continuing. Otherwise you may want to retry
+        # as done here.
         print('Connecting to Telegram servers...')
-        if not self.connect():
+        try:
+            loop.run_until_complete(self.connect())
+        except ConnectionError:
             print('Initial connection failed. Retrying...')
-            if not self.connect():
+            loop.run_until_complete(self.connect())
-                print('Could not connect to Telegram servers.')
-                return
 
         # If the user hasn't called .sign_in() or .sign_up() yet, they won't
         # be authorized. The first thing you must do is authorize. Calling
         # .sign_in() should only be done once as the information is saved on
         # the *.session file so you don't need to enter the code every time.
-        if not self.is_user_authorized():
+        if not loop.run_until_complete(self.is_user_authorized()):
             print('First run. Sending code request...')
-            self.sign_in(user_phone)
+            loop.run_until_complete(self.sign_in(user_phone))
 
             self_user = None
             while self_user is None:
                 code = input('Enter the code you just received: ')
                 try:
-                    self_user = self.sign_in(code=code)
+                    self_user =\
+                        loop.run_until_complete(self.sign_in(code=code))
 
                 # Two-step verification may be enabled, and .sign_in will
                 # raise this error. If that's the case ask for the password.
@@ -122,9 +131,10 @@ class InteractiveTelegramClient(TelegramClient):
                     pw = getpass('Two step verification is enabled. '
                                  'Please enter your password: ')
 
-                    self_user = self.sign_in(password=pw)
+                    self_user =\
+                        loop.run_until_complete(self.sign_in(password=pw))
 
-    def run(self):
+    async def run(self):
         """Main loop of the TelegramClient, will wait for user action"""
 
         # Once everything is ready, we can add an event handler.
@@ -142,7 +152,7 @@ class InteractiveTelegramClient(TelegramClient):
 
             # Entities represent the user, chat or channel
             # corresponding to the dialog on the same index.
-            dialogs = self.get_dialogs(limit=dialog_count)
+            dialogs = await self.get_dialogs(limit=dialog_count)
 
             i = None
             while i is None:
@@ -159,7 +169,7 @@ class InteractiveTelegramClient(TelegramClient):
                 print('  !q: Quits the dialogs window and exits.')
                 print('  !l: Logs out, terminating this session.')
                 print()
-                i = input('Enter dialog ID or a command: ')
+                i = await async_input('Enter dialog ID or a command: ')
                 if i == '!q':
                     return
                 if i == '!l':
@@ -169,7 +179,7 @@ class InteractiveTelegramClient(TelegramClient):
                     #
                     # This is not the same as simply calling .disconnect(),
                     # which simply shuts down everything gracefully.
-                    self.log_out()
+                    await self.log_out()
                     return
 
                 try:
@@ -199,7 +209,7 @@ class InteractiveTelegramClient(TelegramClient):
 
             # And start a while loop to chat
             while True:
-                msg = input('Enter a message: ')
+                msg = await async_input('Enter a message: ')
                 # Quit
                 if msg == '!q':
                     break
@@ -209,16 +219,16 @@ class InteractiveTelegramClient(TelegramClient):
                 # History
                 elif msg == '!h':
                     # First retrieve the messages and some information
-                    messages = self.get_messages(entity, limit=10)
+                    messages = await self.get_messages(entity, limit=10)
 
                     # Iterate over all (in reverse order so the latest appear
                     # the last in the console) and print them with format:
                     # "[hh:mm] Sender: Message"
                     for msg in reversed(messages):
-                        # Note that the .sender attribute is only there for
+                        # Note how we access .sender here. Since we made an
-                        # convenience, the API returns it differently. But
+                        # API call using the self client, it will always have
-                        # this shouldn't concern us. See the documentation
+                        # information about the sender. This is different to
-                        # for .iter_messages() for more information.
+                        # events, where Telegram may not always send the user.
                         name = get_display_name(msg.sender)
 
                         # Format the message content
@@ -242,29 +252,33 @@ class InteractiveTelegramClient(TelegramClient):
                 # Send photo
                 elif msg.startswith('!up '):
                     # Slice the message to get the path
-                    self.send_photo(path=msg[len('!up '):], entity=entity)
+                    path = msg[len('!up '):]
+                    await self.send_photo(path=path, entity=entity)
 
                 # Send file (document)
                 elif msg.startswith('!uf '):
                     # Slice the message to get the path
-                    self.send_document(path=msg[len('!uf '):], entity=entity)
+                    path = msg[len('!uf '):]
+                    await self.send_document(path=path, entity=entity)
 
                 # Delete messages
                 elif msg.startswith('!d '):
                     # Slice the message to get message ID
-                    deleted_msg = self.delete_messages(entity, msg[len('!d '):])
+                    msg = msg[len('!d '):]
+                    deleted_msg = await self.delete_messages(entity, msg)
                     print('Deleted {}'.format(deleted_msg))
 
                 # Download media
                 elif msg.startswith('!dm '):
                     # Slice the message to get message ID
-                    self.download_media_by_id(msg[len('!dm '):])
+                    await self.download_media_by_id(msg[len('!dm '):])
 
                 # Download profile photo
                 elif msg == '!dp':
                     print('Downloading profile picture to usermedia/...')
                     os.makedirs('usermedia', exist_ok=True)
-                    output = self.download_profile_photo(entity, 'usermedia')
+                    output = await self.download_profile_photo(entity,
+                                                               'usermedia')
                     if output:
                         print('Profile picture downloaded to', output)
                     else:
@@ -278,26 +292,26 @@ class InteractiveTelegramClient(TelegramClient):
 
                 # Send chat message (if any)
                 elif msg:
-                    self.send_message(entity, msg, link_preview=False)
+                    await self.send_message(entity, msg, link_preview=False)
 
-    def send_photo(self, path, entity):
+    async def send_photo(self, path, entity):
         """Sends the file located at path to the desired entity as a photo"""
-        self.send_file(
+        await self.send_file(
             entity, path,
             progress_callback=self.upload_progress_callback
         )
         print('Photo sent!')
 
-    def send_document(self, path, entity):
+    async def send_document(self, path, entity):
         """Sends the file located at path to the desired entity as a document"""
-        self.send_file(
+        await self.send_file(
             entity, path,
             force_document=True,
             progress_callback=self.upload_progress_callback
         )
         print('Document sent!')
 
-    def download_media_by_id(self, media_id):
+    async def download_media_by_id(self, media_id):
         """Given a message ID, finds the media this message contained and
            downloads it.
         """
@@ -310,7 +324,7 @@ class InteractiveTelegramClient(TelegramClient):
 
         print('Downloading media to usermedia/...')
         os.makedirs('usermedia', exist_ok=True)
-        output = self.download_media(
+        output = await self.download_media(
             msg.media,
             file='usermedia/',
             progress_callback=self.download_progress_callback
@@ -336,29 +350,33 @@ class InteractiveTelegramClient(TelegramClient):
             bytes_to_string(total_bytes), downloaded_bytes / total_bytes)
         )
 
-    def message_handler(self, event):
+    async def message_handler(self, event):
         """Callback method for received events.NewMessage"""
 
-        # Note that accessing ``.sender`` and ``.chat`` may be slow since
+        # Note that message_handler is called when a Telegram update occurs
-        # these are not cached and must be queried always! However it lets
+        # and an event is created. Telegram may not always send information
-        # us access the chat title and user name.
+        # about the ``.sender`` or the ``.chat``, so if you *really* want it
+        # you should use ``get_chat()`` and ``get_sender()`` while working
+        # with events. Since they are methods, you know they may make an API
+        # call, which can be expensive.
+        chat = await event.get_chat()
         if event.is_group:
             if event.out:
                 sprint('>> sent "{}" to chat {}'.format(
-                    event.text, get_display_name(event.chat)
+                    event.text, get_display_name(chat)
                 ))
             else:
                 sprint('<< {} @ {} sent "{}"'.format(
-                    get_display_name(event.sender),
+                    get_display_name(await event.get_sender()),
-                    get_display_name(event.chat),
+                    get_display_name(chat),
                     event.text
                 ))
         else:
             if event.out:
                 sprint('>> "{}" to user {}'.format(
-                    event.text, get_display_name(event.chat)
+                    event.text, get_display_name(chat)
                 ))
             else:
                 sprint('<< {} sent "{}"'.format(
-                    get_display_name(event.chat), event.text
+                    get_display_name(chat), event.text
                 ))

telethon_examples/print_updates.py

@@ -5,6 +5,7 @@
 #       your environment variables. This is a good way to use these private
 #       values. See https://superuser.com/q/284342.
 
+import asyncio
 from os import environ
 
 # environ is used to get API information from environment variables
@@ -13,28 +14,27 @@ from os import environ
 from telethon import TelegramClient
 
 
-def main():
+async def main():
     session_name = environ.get('TG_SESSION', 'session')
     client = TelegramClient(session_name,
                             int(environ['TG_API_ID']),
                             environ['TG_API_HASH'],
-                            proxy=None,
+                            proxy=None)
-                            update_workers=4,
-                            spawn_read_thread=False)
 
     if 'TG_PHONE' in environ:
-        client.start(phone=environ['TG_PHONE'])
+        await client.start(phone=environ['TG_PHONE'])
     else:
-        client.start()
+        await client.start()
 
     client.add_event_handler(update_handler)
     print('(Press Ctrl+C to stop this)')
-    client.idle()
+    await client.disconnected
 
 
-def update_handler(update):
+async def update_handler(update):
     print(update)
 
 
 if __name__ == '__main__':
-    main()
+    loop = asyncio.get_event_loop()
+    loop.run_until_complete(main())

telethon_examples/replier.py

@@ -10,11 +10,12 @@ This script assumes that you have certain files on the working directory,
 such as "xfiles.m4a" or "anytime.png" for some of the automated replies.
 """
 import re
+import asyncio
 from collections import defaultdict
 from datetime import datetime, timedelta
 from os import environ
 
-from telethon import TelegramClient, events, utils
+from telethon import TelegramClient, events
 
 """Uncomment this for debugging
 import logging
@@ -30,57 +31,54 @@ REACTS = {'emacs': 'Needs more vim',
 recent_reacts = defaultdict(list)
 
 
-if __name__ == '__main__':
 # TG_API_ID and TG_API_HASH *must* exist or this won't run!
 session_name = environ.get('TG_SESSION', 'session')
 client = TelegramClient(
     session_name, int(environ['TG_API_ID']), environ['TG_API_HASH'],
-        spawn_read_thread=False, proxy=None, update_workers=4
+    proxy=None
 )
 
-    @client.on(events.NewMessage)
-    def my_handler(event: events.NewMessage.Event):
-        global recent_reacts
 
-        # This utils function gets the unique identifier from peers (to_id)
+@client.on(events.NewMessage)
-        to_id = utils.get_peer_id(event.message.to_id)
+async def my_handler(event: events.NewMessage.Event):
+    global recent_reacts
 
     # Through event.raw_text we access the text of messages without format
     words = re.split('\W+', event.raw_text)
 
     # Try to match some reaction
     for trigger, response in REACTS.items():
-            if len(recent_reacts[to_id]) > 3:
+        if len(recent_reacts[event.chat_id]) > 3:
             # Silently ignore triggers if we've recently sent 3 reactions
             break
 
         if trigger in words:
             # Remove recent replies older than 10 minutes
-                recent_reacts[to_id] = [
+            recent_reacts[event.chat_id] = [
-                    a for a in recent_reacts[to_id] if
+                a for a in recent_reacts[event.chat_id] if
                 datetime.now() - a < timedelta(minutes=10)
             ]
             # Send a reaction as a reply (otherwise, event.respond())
-                event.reply(response)
+            await event.reply(response)
             # Add this reaction to the list of recent actions
-                recent_reacts[to_id].append(datetime.now())
+            recent_reacts[event.chat_id].append(datetime.now())
 
     # Automatically send relevant media when we say certain things
     # When invoking requests, get_input_entity needs to be called manually
     if event.out:
+        chat = await event.get_input_chat()
         if event.raw_text.lower() == 'x files theme':
-                client.send_voice_note(event.message.to_id, 'xfiles.m4a',
+            await client.send_file(chat, 'xfiles.m4a',
-                                       reply_to=event.message.id)
+                                   reply_to=event.message.id, voice_note=True)
         if event.raw_text.lower() == 'anytime':
-                client.send_file(event.message.to_id, 'anytime.png',
+            await client.send_file(chat, 'anytime.png',
                                    reply_to=event.message.id)
         if '.shrug' in event.text:
-                event.edit(event.text.replace('.shrug', r'¯\_(ツ)_/¯'))
+            await event.edit(event.text.replace('.shrug', r'¯\_(ツ)_/¯'))
 
-    if 'TG_PHONE' in environ:
-        client.start(phone=environ['TG_PHONE'])
-    else:
-        client.start()
 
+if __name__ == '__main__':
+    loop = asyncio.get_event_loop()
+    loop.run_until_complete(client.start(phone=environ.get('TG_PHONE')))
     print('(Press Ctrl+C to stop this)')
-    client.idle()
+    client.run_until_disconnected()

try_telethon.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+import asyncio
 import traceback
 
 from telethon_examples.interactive_telegram_client \
@@ -38,14 +39,15 @@ if __name__ == '__main__':
         **kwargs)
 
     print('Initialization done!')
+    loop = asyncio.get_event_loop()
 
     try:
-        client.run()
+        loop.run_until_complete(client.run())
 
     except Exception as e:
         print('Unexpected error ({}): {} at\n{}'.format(
             type(e), e, traceback.format_exc()))
 
     finally:
-        client.disconnect()
+        loop.run_until_complete(client.disconnect())
         print('Thanks for trying the interactive example! Exiting...')