From b07be8cb62cc873d0c069c6410fdb0275620f66e Mon Sep 17 00:00:00 2001
From: Alexander Schmidt <alex@treefish.org>
Date: Sat, 3 Oct 2020 02:50:28 +0200
Subject: [PATCH] initial commit

---
 .gitignore      |  2 ++
 doc/config.json | 10 ++++++
 src/mtxbot.py   | 78 ++++++++++++++++++++++++++++++++++++++++++++++
 src/presence.py | 83 +++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 173 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 doc/config.json
 create mode 100755 src/mtxbot.py
 create mode 100644 src/presence.py

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f6a9ff7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/run
+*~
diff --git a/doc/config.json b/doc/config.json
new file mode 100644
index 0000000..ad3d114
--- /dev/null
+++ b/doc/config.json
@@ -0,0 +1,10 @@
+{
+    "server": {
+        "url": "https://matrix.example.com",
+        "user": "@user:matrix.example.com",
+        "password": "WHATEVER"
+    },
+    "paths": {
+        "fifodir": "/path/to/fifo/dir"
+    }
+}
diff --git a/src/mtxbot.py b/src/mtxbot.py
new file mode 100755
index 0000000..0843f7d
--- /dev/null
+++ b/src/mtxbot.py
@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+
+import asyncio
+import aiofiles
+import json
+import logging
+import nio
+import os
+import signal
+import stat
+import time
+
+import sys
+assert sys.version_info >= (3, 5)
+
+from presence import Presence
+
+def handleInterrupt(sig, frame):
+    global stopped
+    if os.getpid() == mainPid:
+        logging.info( "Got stop signal." )
+        stopped = True
+        for presence in presences:
+            presence.stop()
+
+async def main():
+    client = nio.AsyncClient(config['server']['url'], config['server']['user'])
+
+    try:
+        await client.login(config['server']['password'])
+
+        presence_tasks = []
+        for presence in presences:
+            presence_tasks.append( asyncio.create_task(presence.run(client)) )
+
+        done, pending = await asyncio.wait( presence_tasks,
+                                            return_when = asyncio.FIRST_EXCEPTION )
+
+        for task in done:
+            try:
+                task.result()
+            except Exception as e:
+                logging.error( "Error running task: %s" % str(e) )
+
+    finally:
+        await client.close()
+
+logging.basicConfig(format='[%(asctime)s] %(levelname)s: %(message)s',
+                    level=logging.INFO,
+                    datefmt='%m/%d/%Y %H:%M:%S')
+
+mainPid = os.getpid()
+signal.signal(signal.SIGINT, handleInterrupt)
+
+stopped = False
+
+if len(sys.argv) != 2:
+    print("Usage: %s <config json>" % sys.argv[0])
+    sys.exit(1)
+
+with open(sys.argv[1]) as configFile:
+    config = json.load(configFile)
+
+while not stopped:
+    presences = []
+    for entry in os.listdir(config['paths']['fifodir']):
+        if stat.S_ISFIFO(os.stat(entry).st_mode):
+            logging.info("Creating presence for %s..." % entry)
+            presences.append( Presence( entry, "%s/%s" %
+                                        (config['paths']['fifodir'], entry) ) )
+    if len(presences) == 0:
+        logging.error("No fifos could be found!")
+        break
+    asyncio.run(main())
+    if not stopped:
+        logging.warning("Main loop exited!")
+        logging.info("Restarting after grace period...")
+        time.sleep(3.0)
diff --git a/src/presence.py b/src/presence.py
new file mode 100644
index 0000000..0a7b1a1
--- /dev/null
+++ b/src/presence.py
@@ -0,0 +1,83 @@
+import aiofiles
+import asyncio
+import errno
+import logging
+import posix
+
+class Presence:
+    def __init__(self, room_name, fifo_path):
+        self._room_name = room_name
+        self._fifo_path = fifo_path
+
+    async def run(self, client):
+        self._log(logging.INFO, "Presence running")
+        self._stop = False
+        while not self._stop:
+            room_id = await self._enter_room(client)
+            try:
+                await self._process_messages(client, room_id)
+            except Exception as e:
+                self._log(logging.ERROR, "Error processing messages: %s", str(e))
+        self._log(logging.INFO, "Presence stopped")
+
+    def stop(self):
+        self._stop = True
+        fifo = -1
+        try:
+            fifo = posix.open(self._fifo_path, posix.O_WRONLY | posix.O_NONBLOCK)
+            posix.write(fifo, "\n".encode())
+        except OSError as e:
+            if e.errno == errno.ENXIO:
+                pass
+        finally:
+            if fifo != -1:
+                posix.close(fifo)
+
+    async def _enter_room(self, client):
+        while not self._stop:
+            await client.sync()
+
+            for room_id, room in client.rooms.items():
+                if room.display_name == self._room_name:
+                    self._log(logging.INFO, "A room member already")
+                    return room_id
+
+            self._log(logging.INFO, "Not yet a room member")
+
+            was_invited = False
+            for room_id, room in client.invited_rooms.items():
+                if room.display_name == self._room_name:
+                    was_invited = True
+                    self._log(logging.INFO, "Joining room")
+                    await client.join(room_id)
+                    break
+
+            if not was_invited:
+                self._log(logging.INFO, "Got no room invite yet")
+
+            await asyncio.sleep(3.0)
+
+    async def _process_messages(self, client, room_id):
+        if self._stop:
+            return
+        async for line in self._read_fifo(self._fifo_path):
+            if self._stop:
+                break
+            await client.room_send(
+                room_id=room_id,
+                message_type="m.room.message",
+                content={
+                    "msgtype": "m.text",
+                    "body": line.rstrip("\n")
+                }
+            )
+
+    def _log(self, level, msg, *args, **kwargs):
+        logging.log(level, "P{%s}: %s" % (self._room_name, msg), *args, **kwargs)
+
+    @staticmethod
+    async def _read_fifo(file_path):
+        while True:
+            async with aiofiles.open(file_path) as fifo:
+                async for line in fifo:
+                    yield(line)
-- 
2.39.5