commit 269bb7a5923cdb1de69a4a3e42e05ab1bb4064c0
Author: Cavallium <andrea@warp.ovh>
Date:   Sun Nov 3 22:11:45 2019 +0100

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..818fabc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+
+config.py
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..fe2758f
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+outside-fetcher
diff --git a/__main__.py b/__main__.py
new file mode 100644
index 0000000..f3bd20c
--- /dev/null
+++ b/__main__.py
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+import typing
+import pyrogram
+import aiohttp.web
+import asyncio
+import multiprocessing
+import config
+
+
+from async_worker.async_worker import AsyncTaskScheduler
+from tasks.channel_history import ChannelHistoryReadTask
+
+
+class ClientRefCount:
+    client: pyrogram.Client
+    count: int = 0
+
+    def __init__(self, api_id: int, api_hash: str, name: str):
+        self.client = pyrogram.Client(name, api_id, api_hash)
+
+    async def start(self):
+        await self.client.start()
+
+    def get_client(self) -> pyrogram.Client:
+        self.count += 1
+        return self.client
+
+    def __gt__(self, other: 'ClientRefCount'):
+        return self.count < other.count
+
+
+class ClientRoundRobin:
+    clients: typing.List[ClientRefCount]
+
+    def __init__(self):
+        self.clients = []
+
+    def get_client(self) -> pyrogram.Client:
+        return min(self.clients).get_client()
+
+    async def add_client(self, api_id: int, api_hash: str, name: str):
+        client = ClientRefCount(api_id, api_hash, name)
+        self.clients.append(client)
+        await client.start()
+
+
+class FetcherAPI:
+    clients: ClientRoundRobin
+    scheduler: AsyncTaskScheduler
+    already_watching: typing.List[str]
+
+    def __init__(self):
+        self.clients = ClientRoundRobin()
+        self.scheduler = AsyncTaskScheduler()
+        self.already_watching = []
+
+    async def setup(self):
+        for name in config.sessions:
+            await self.clients.add_client(config.app_id, config.app_hash, name)
+
+        app = aiohttp.web.Application()
+        app.add_routes([aiohttp.web.get("/tasks/watch/add/{username}", self.add_channel)])
+
+        await asyncio.gather(
+            aiohttp.web._run_app(app, host=config.listen_host, port=config.listen_port),
+            *(
+                self.scheduler.loop()
+                for _ in range(multiprocessing.cpu_count())
+            )
+        )
+
+    async def add_channel(self, request):
+        user = request.match_info["username"]
+
+        if user in self.already_watching:
+            return aiohttp.web.Response(status=400)
+
+        self.already_watching.append(user)
+
+        client = self.clients.get_client()
+        task = ChannelHistoryReadTask()
+
+        peer = await client.resolve_peer(user)
+        task.setup(client, peer, config.webhook)
+
+        await self.scheduler.submit(task)
+        return aiohttp.web.Response(status=200)
+
+
+if __name__ == "__main__":
+    api = FetcherAPI()
+
+    _loop = asyncio.get_event_loop()
+    _loop.run_until_complete(api.setup())
diff --git a/async_worker/__init__.py b/async_worker/__init__.py
new file mode 100644
index 0000000..ebbca31
--- /dev/null
+++ b/async_worker/__init__.py
@@ -0,0 +1,6 @@
+from .async_worker import AsyncTaskScheduler, AsyncTask
+
+__all__ = [
+    "AsyncTaskScheduler",
+    "AsyncTask"
+]
diff --git a/async_worker/async_worker.py b/async_worker/async_worker.py
new file mode 100644
index 0000000..209c147
--- /dev/null
+++ b/async_worker/async_worker.py
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+# MIT License
+#
+# Copyright (c) [2019] [andrew-ld]
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import asyncio
+import abc
+import typing
+import time
+import operator
+
+
+class AsyncTask(abc.ABC):
+    _next: int
+    _locked: bool
+
+    __slots__ = [
+        "_next",
+        "_locked"
+    ]
+
+    def __init__(self):
+        self._next = 0
+        self._locked = False
+
+    @abc.abstractmethod
+    async def process(self) -> int:
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def setup(self, *args, **kwargs):
+        raise NotImplementedError
+
+    def set_next(self, _next: int):
+        self._next = time.time() + _next
+
+    def get_next(self) -> int:
+        return self._next
+
+    def get_delay(self) -> int:
+        return self.get_next() - time.time()
+
+    def lock(self):
+        self._locked = True
+
+    def unlock(self):
+        self._locked = False
+
+    def is_locked(self):
+        return self._locked
+
+
+class AsyncTaskDelay:
+    _task: asyncio.Task
+    _delay_end: int
+
+    __slots__ = [
+        "_task",
+        "_delay_end",
+    ]
+
+    def __init__(self):
+        self._task = asyncio.ensure_future(asyncio.Future())
+        self._delay_end = 0
+
+    async def sleep(self, _time) -> bool:
+        self._delay_end = _time + time.time()
+
+        self._task = asyncio.ensure_future(
+            asyncio.sleep(_time)
+        )
+
+        try:
+
+            await self._task
+
+        except asyncio.CancelledError:
+            return False
+
+        return True
+
+    def is_sleeping(self) -> bool:
+        return not (self._task.done() or self._task.cancelled())
+
+    def cancel(self):
+        self._task.cancel()
+
+    def __gt__(self, other: 'AsyncTaskDelay'):
+        return self._delay_end > other._delay_end
+
+
+class AsyncMultipleEvent:
+    _events: typing.List[asyncio.Event]
+
+    __slots__ = [
+        "_events"
+    ]
+
+    def __init__(self):
+        self._events = []
+
+    async def lock(self):
+        event = asyncio.Event()
+        self._events.append(event)
+        await event.wait()
+
+    def unlock_first(self):
+        if self._events:
+            self._events.pop(0).set()
+
+
+class AsyncTaskScheduler:
+    _queue: typing.List[AsyncTask]
+    _wait_enqueue: AsyncMultipleEvent
+    _wait_unlock: AsyncMultipleEvent
+    _sleep_tasks: typing.List[AsyncTaskDelay]
+
+    __slots__ = [
+        "_queue",
+        "_sleep_tasks",
+        "_wait_enqueue",
+        "_wait_unlock"
+    ]
+
+    def __init__(self):
+        self._queue = []
+        self._sleep_tasks = []
+
+        self._wait_enqueue = AsyncMultipleEvent()
+        self._wait_unlock = AsyncMultipleEvent()
+
+    async def submit(self, task: AsyncTask):
+        self._queue.append(task)
+        self._wait_enqueue.unlock_first()
+        self._wait_unlock.unlock_first()
+
+        cancellable_tasks = [*filter(lambda x: x.is_sleeping(), self._sleep_tasks)]
+
+        if cancellable_tasks:
+            max(cancellable_tasks).cancel()
+
+    async def loop(self):
+        sleeper = AsyncTaskDelay()
+        self._sleep_tasks.append(sleeper)
+
+        while True:
+            if not self._queue:
+                await self._wait_enqueue.lock()
+
+            while self._queue:
+                runnable_tasks = [*filter(lambda x: not x.is_locked(), self._queue)]
+
+                if not runnable_tasks:
+                    await self._wait_unlock.lock()
+                    continue
+
+                task, delay = min(
+                    (
+                        (task, task.get_next())
+                        for task in runnable_tasks
+                    ),
+
+                    key=operator.itemgetter(1)
+                )
+
+                delay -= time.time()
+                task.lock()
+
+                if delay > 0 and not await sleeper.sleep(delay):
+                    task.unlock()
+                    continue
+
+                next_delay = await task.process()
+
+                if next_delay is False:
+                    self._queue.remove(task)
+
+                else:
+                    task.set_next(next_delay)
+                    task.unlock()
+                    self._wait_unlock.unlock_first()
diff --git a/config.py.example b/config.py.example
new file mode 100644
index 0000000..3c7d597
--- /dev/null
+++ b/config.py.example
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+app_id = 6
+app_hash = "eb06d4abfb49dc3eeb1aeb98ae0f581e"
+sessions = ["sessions/test1", "sessions/test2"]
+
+listen_host = "127.0.0.1"
+listen_port = 8080
+
+webhook = "https://example.org/webhook"
+
+
+
+# Usage:
+# http://listen_host:listen_port/tasks/watch/add/{groupname}
diff --git a/tasks/__init__.py b/tasks/__init__.py
new file mode 100644
index 0000000..2b35e7f
--- /dev/null
+++ b/tasks/__init__.py
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+from .channel_history import ChannelHistoryReadTask
+
+__all__ = [
+    "ChannelHistoryReadTask"
+]
diff --git a/tasks/channel_history.py b/tasks/channel_history.py
new file mode 100644
index 0000000..f7a545e
--- /dev/null
+++ b/tasks/channel_history.py
@@ -0,0 +1,58 @@
+import pyrogram
+import aiohttp
+
+from async_worker.async_worker import AsyncTask
+from pyrogram.api.types import ChannelMessagesFilterEmpty
+from pyrogram.api.types.updates import ChannelDifference, ChannelDifferenceTooLong, ChannelDifferenceEmpty
+from pyrogram.api.functions.updates.get_channel_difference import GetChannelDifference
+
+from pyrogram.client.types.messages_and_media import Message as MessagePyrogram
+
+
+class ChannelHistoryReadTask(AsyncTask):
+    channel: pyrogram.Chat
+    client: pyrogram.Client
+    pts: int
+    webhook: str
+
+    def setup(self, client: pyrogram.Client, channel: pyrogram.Chat, webhook: str):
+        self.client = client
+        self.channel = channel
+        self.pts = False
+        self.webhook = webhook
+
+    async def process(self):
+        response = await self.client.send(
+            GetChannelDifference(
+                channel=self.channel,
+                filter=ChannelMessagesFilterEmpty(),
+                pts=self.pts if self.pts else 0xFFFFFFF,
+                limit=0xFFFFFFF,
+                force=True
+            )
+        )
+
+        if isinstance(response, ChannelDifference):
+            self.pts = response.pts
+
+            users = {i.id: i for i in response.users}
+            chats = {i.id: i for i in response.chats}
+            http = aiohttp.ClientSession()
+
+            for message in response.new_messages:
+                message = await MessagePyrogram._parse(self.client, message, users, chats)
+                await http.post(self.webhook, data=bytes(str(message), "utf8"))
+
+            await http.close()
+
+            if not response.final:
+                return 1
+
+            return response.timeout
+
+        if isinstance(response, ChannelDifferenceEmpty):
+            self.pts = response.pts
+            return response.timeout
+
+        if isinstance(response, ChannelDifferenceTooLong):
+            return False