inbox/resolvers/messages.py

import json
from datetime import datetime, timezone
from services.auth import login_required
from services.presence import notify_message
from services.redis import redis
from services.schema import mutation


@mutation.field("createMessage")
@login_required
async def create_message(_, info, chat: str, body: str, reply_to=None):
    """
    create message with
        :body for
        :chat_id replying to
        :reply_to optionally
    """
    author_id = info.context["author_id"]

    chat = await redis.execute("GET", f"chats/{chat}")
    if not chat:
        return {"error": "chat is not exist"}
    else:
        chat = dict(json.loads(chat))
        message_id = await redis.execute("GET", f"chats/{chat['id']}/next_message_id")
        message_id = int(message_id)
        new_message = {
            "chat": chat["id"],
            "id": message_id,
            "author": author_id,
            "body": body,
            "createdAt": int(datetime.now(tz=timezone.utc).timestamp()),
        }
        if reply_to:
            new_message["replyTo"] = reply_to
        chat["updatedAt"] = new_message["createdAt"]
        await redis.execute("SET", f"chats/{chat['id']}", json.dumps(chat))
        print(f"[inbox] creating message {new_message}")
        await redis.execute(
            "SET", f"chats/{chat['id']}/messages/{message_id}", json.dumps(new_message)
        )
        await redis.execute("LPUSH", f"chats/{chat['id']}/message_ids", str(message_id))
        await redis.execute(
            "SET", f"chats/{chat['id']}/next_message_id", str(message_id + 1)
        )

        members = chat["members"]
        for member_id in members:
            await redis.execute(
                "LPUSH", f"chats/{chat['id']}/unread/{member_id}", str(message_id)
            )

        # result = FollowingResult("NEW", "chat", new_message)
        # await FollowingManager.push("chat", result)

        # subscribe on updates
        await notify_message(new_message, chat["id"])

        return {"message": new_message, "error": None}


@mutation.field("updateMessage")
@login_required
async def update_message(_, info, chat_id: str, message_id: int, body: str):
    author_id = info.context["author_id"]

    chat = await redis.execute("GET", f"chats/{chat_id}")
    if not chat:
        return {"error": "chat not exist"}

    message = await redis.execute("GET", f"chats/{chat_id}/messages/{message_id}")
    if not message:
        return {"error": "message  not exist"}

    message = json.loads(message)
    if message["author"] != author_id:
        return {"error": "access denied"}

    message["body"] = body
    message["updatedAt"] = int(datetime.now(tz=timezone.utc).timestamp())

    await redis.execute(
        "SET", f"chats/{chat_id}/messages/{message_id}", json.dumps(message)
    )

    # result = FollowingResult("UPDATE", "chat", new_message)
    # await FollowingManager.push("chat", result)
    # TODO: subscribe on updates

    return {"message": message, "error": None}


@mutation.field("deleteMessage")
@login_required
async def delete_message(_, info, chat_id: str, message_id: int):
    author_id = info.context["author_id"]

    chat = await redis.execute("GET", f"chats/{chat_id}")
    if not chat:
        return {"error": "chat not exist"}
    chat = json.loads(chat)

    message = await redis.execute("GET", f"chats/{chat_id}/messages/{str(message_id)}")
    if not message:
        return {"error": "message  not exist"}
    message = json.loads(message)
    if message["author"] != author_id:
        return {"error": "access denied"}

    await redis.execute("LREM", f"chats/{chat_id}/message_ids", 0, str(message_id))
    await redis.execute("DEL", f"chats/{chat_id}/messages/{str(message_id)}")

    members = chat["members"]
    for member_id in members:
        await redis.execute(
            "LREM", f"chats/{chat_id}/unread/{member_id}", 0, str(message_id)
        )

    # result = FollowingResult("DELETED", "chat", message)
    # await FollowingManager.push(result)
    # TODO ?

    return {}


@mutation.field("markAsRead")
@login_required
async def mark_as_read(_, info, chat_id: str, messages: [int]):
    author_id = info.context["author_id"]

    chat = await redis.execute("GET", f"chats/{chat_id}")
    if not chat:
        return {"error": "chat not exist"}

    chat = json.loads(chat)
    members = set(chat["members"])
    if author_id not in members:
        return {"error": "access denied"}

    for message_id in messages:
        await redis.execute(
            "LREM", f"chats/{chat_id}/unread/{author_id}", 0, str(message_id)
        )

    return {"error": None}


messages_resolvers = {
    "Mutation": {
        "markAsRead": mark_as_read,
        "deleteMessage": delete_message,
        "updateMessage": update_message,
        "createMessage": create_message,
    }
}