#!/usr/bin/env python
import asyncio
import msgpack
import os
import struct
import socket
from motor.motor_asyncio import AsyncIOMotorClient
from datetime import datetime

MONGO_URI = os.getenv("MONGO_URI", "mongodb://127.0.0.1:27017/default")
FQDN = socket.getfqdn()
EXPIRE_AFTER_SECONDS = int(os.getenv("EXPIRE_AFTER_SECONDS", "1209600"))

db = AsyncIOMotorClient(MONGO_URI).get_default_database()
db.log.create_index("time", expireAfterSeconds=EXPIRE_AFTER_SECONDS)


class Server(object):
    def __init__(self):
        self._loop = asyncio.get_event_loop()

    async def __call__(self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter) -> None:
        unpacker = msgpack.Unpacker(raw=False)
        try:
            while True:
                data = await reader.read(n=4096)
                if not data:
                    raise ConnectionError("Client connection closed")
                unpacker.feed(data)
                for obj in unpacker:
                    self._loop.create_task(self._handle_request(obj, writer))
        except ConnectionError:
            pass

    async def _handle_request(self, obj, writer: asyncio.StreamWriter) -> None:
        tag, time, record, options = obj
        try:
            seconds, nanoseconds = struct.unpack(">II", time.data)
            record["time"] = datetime.fromtimestamp(seconds).replace(microsecond=int(nanoseconds / 1000))
        except AttributeError:
            record["time"] = datetime.fromtimestamp(time)
        assert not options, "Can't handle options"

        record.pop("container_id", None)
        record["host"] = FQDN
        await db.log.insert_one(record)


async def main():
    try:
        server = await asyncio.start_server(Server(), host="127.0.0.1", port=24224)
        while True:
            await asyncio.sleep(0.1)
    finally:
        server.close()


try:
    asyncio.get_event_loop().run_until_complete(main())
except KeyboardInterrupt:
    pass