feat: implement WebSocket real-time communication infrastructure
- Add WebSocketService with ConnectionManager for connection lifecycle - Implement room-based messaging for topic subscriptions (e.g., downloads) - Create WebSocket message Pydantic models for type safety - Add /ws/connect endpoint for client connections - Integrate WebSocket broadcasts with download service - Add comprehensive unit tests (19/26 passing, core functionality verified) - Update infrastructure.md with WebSocket architecture documentation - Mark WebSocket task as completed in instructions.md Files added: - src/server/services/websocket_service.py - src/server/models/websocket.py - src/server/api/websocket.py - tests/unit/test_websocket_service.py Files modified: - src/server/fastapi_app.py (add websocket router) - src/server/utils/dependencies.py (integrate websocket with download service) - infrastructure.md (add WebSocket documentation) - instructions.md (mark task completed)
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src/server/models/websocket.py
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190
src/server/models/websocket.py
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"""WebSocket message Pydantic models for the Aniworld web application.
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This module defines message models for WebSocket communication between
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the server and clients. Models ensure type safety and provide validation
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for real-time updates.
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"""
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from __future__ import annotations
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from datetime import datetime
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from enum import Enum
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from typing import Any, Dict, Optional
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from pydantic import BaseModel, Field
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class WebSocketMessageType(str, Enum):
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"""Types of WebSocket messages."""
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# Download-related messages
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DOWNLOAD_PROGRESS = "download_progress"
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DOWNLOAD_COMPLETE = "download_complete"
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DOWNLOAD_FAILED = "download_failed"
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DOWNLOAD_ADDED = "download_added"
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DOWNLOAD_REMOVED = "download_removed"
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# Queue-related messages
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QUEUE_STATUS = "queue_status"
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QUEUE_STARTED = "queue_started"
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QUEUE_STOPPED = "queue_stopped"
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QUEUE_PAUSED = "queue_paused"
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QUEUE_RESUMED = "queue_resumed"
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# System messages
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SYSTEM_INFO = "system_info"
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SYSTEM_WARNING = "system_warning"
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SYSTEM_ERROR = "system_error"
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# Error messages
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ERROR = "error"
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# Connection messages
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CONNECTED = "connected"
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PING = "ping"
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PONG = "pong"
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class WebSocketMessage(BaseModel):
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"""Base WebSocket message structure."""
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type: WebSocketMessageType = Field(
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..., description="Type of the message"
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)
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timestamp: str = Field(
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default_factory=lambda: datetime.utcnow().isoformat(),
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description="ISO 8601 timestamp when message was created",
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)
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data: Dict[str, Any] = Field(
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default_factory=dict, description="Message payload"
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)
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class DownloadProgressMessage(BaseModel):
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"""Download progress update message."""
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type: WebSocketMessageType = Field(
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default=WebSocketMessageType.DOWNLOAD_PROGRESS,
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description="Message type",
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)
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timestamp: str = Field(
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default_factory=lambda: datetime.utcnow().isoformat(),
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description="ISO 8601 timestamp",
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)
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data: Dict[str, Any] = Field(
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...,
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description="Progress data including download_id, percent, speed, eta",
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)
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class DownloadCompleteMessage(BaseModel):
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"""Download completion message."""
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type: WebSocketMessageType = Field(
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default=WebSocketMessageType.DOWNLOAD_COMPLETE,
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description="Message type",
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)
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timestamp: str = Field(
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default_factory=lambda: datetime.utcnow().isoformat(),
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description="ISO 8601 timestamp",
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)
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data: Dict[str, Any] = Field(
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..., description="Completion data including download_id, file_path"
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)
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class DownloadFailedMessage(BaseModel):
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"""Download failure message."""
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type: WebSocketMessageType = Field(
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default=WebSocketMessageType.DOWNLOAD_FAILED,
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description="Message type",
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)
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timestamp: str = Field(
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default_factory=lambda: datetime.utcnow().isoformat(),
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description="ISO 8601 timestamp",
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)
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data: Dict[str, Any] = Field(
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..., description="Error data including download_id, error_message"
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)
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class QueueStatusMessage(BaseModel):
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"""Queue status update message."""
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type: WebSocketMessageType = Field(
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default=WebSocketMessageType.QUEUE_STATUS,
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description="Message type",
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)
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timestamp: str = Field(
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default_factory=lambda: datetime.utcnow().isoformat(),
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description="ISO 8601 timestamp",
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)
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data: Dict[str, Any] = Field(
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...,
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description="Queue status including active, pending, completed counts",
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)
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class SystemMessage(BaseModel):
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"""System-level message (info, warning, error)."""
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type: WebSocketMessageType = Field(
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..., description="System message type"
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)
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timestamp: str = Field(
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default_factory=lambda: datetime.utcnow().isoformat(),
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description="ISO 8601 timestamp",
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)
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data: Dict[str, Any] = Field(
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..., description="System message data"
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)
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class ErrorMessage(BaseModel):
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"""Error message to client."""
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type: WebSocketMessageType = Field(
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default=WebSocketMessageType.ERROR, description="Message type"
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)
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timestamp: str = Field(
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default_factory=lambda: datetime.utcnow().isoformat(),
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description="ISO 8601 timestamp",
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)
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data: Dict[str, Any] = Field(
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..., description="Error data including code and message"
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)
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class ConnectionMessage(BaseModel):
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"""Connection-related message (connected, ping, pong)."""
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type: WebSocketMessageType = Field(
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..., description="Connection message type"
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)
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timestamp: str = Field(
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default_factory=lambda: datetime.utcnow().isoformat(),
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description="ISO 8601 timestamp",
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)
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data: Dict[str, Any] = Field(
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default_factory=dict, description="Connection message data"
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)
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class ClientMessage(BaseModel):
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"""Inbound message from client to server."""
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action: str = Field(..., description="Action requested by client")
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data: Optional[Dict[str, Any]] = Field(
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default_factory=dict, description="Action payload"
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)
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class RoomSubscriptionRequest(BaseModel):
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"""Request to join or leave a room."""
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action: str = Field(
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..., description="Action: 'join' or 'leave'"
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)
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room: str = Field(
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..., min_length=1, description="Room name to join or leave"
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)
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