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"""
Tasks API - Phase 5
CRUD operations for tasks with Dapr event publishing.
All state changes are published to Kafka for microservices to consume.
"""
from datetime import datetime, timezone
from typing import List, Optional
from fastapi import APIRouter, HTTPException, status, Depends
from sqlalchemy.orm import Session
from pydantic import BaseModel
from src.models.base import get_db
from src.models.task import Task as TaskModel
from src.orchestrator.event_publisher import EventPublisher
from src.utils.logging import get_logger
logger = get_logger(__name__)
router = APIRouter(prefix="/api/tasks", tags=["tasks"])
event_publisher = EventPublisher()
# Pydantic schemas for request/response
class TaskCreate(BaseModel):
title: str
description: Optional[str] = None
due_date: Optional[str] = None
priority: Optional[str] = "medium"
tags: Optional[List[str]] = []
reminder_config: Optional[dict] = None
recurrence_rule: Optional[dict] = None
class TaskUpdate(BaseModel):
title: Optional[str] = None
description: Optional[str] = None
due_date: Optional[str] = None
priority: Optional[str] = None
tags: Optional[List[str]] = None
status: Optional[str] = None
reminder_config: Optional[dict] = None
recurrence_rule: Optional[dict] = None
class TaskResponse(BaseModel):
id: str
user_id: str
title: str
description: Optional[str]
due_date: Optional[str]
priority: str
tags: List[str]
status: str
reminder_config: Optional[dict]
recurrence_rule: Optional[dict]
created_at: str
updated_at: str
@router.post("/", response_model=TaskResponse, status_code=status.HTTP_201_CREATED)
async def create_task(
task_data: TaskCreate,
user_id: str,
db: Session = Depends(get_db)
):
"""
Create a new task and publish task.created event.
Args:
task_data: Task creation data
user_id: User ID from authentication
db: Database session
Returns:
Created task
"""
try:
# Create task in database
task = TaskModel(
title=task_data.title,
description=task_data.description,
due_date=task_data.due_date,
priority=task_data.priority or "medium",
tags=task_data.tags or [],
reminder_config=task_data.reminder_config,
recurrence_rule=task_data.recurrence_rule,
user_id=user_id,
status="active"
)
db.add(task)
db.commit()
db.refresh(task)
logger.info(
"task_created",
task_id=str(task.id),
user_id=user_id,
title=task.title
)
# Publish events via Dapr
await event_publisher.publish_task_event(
"task.created",
str(task.id),
task.to_dict()
)
await event_publisher.publish_task_update(
str(task.id),
"created",
task.to_dict()
)
await event_publisher.publish_audit_event(
"Task",
str(task.id),
"CREATE",
"user",
user_id,
new_values=task.to_dict()
)
return TaskResponse(**task.to_dict())
except Exception as e:
logger.error("create_task_failed", error=str(e))
db.rollback()
raise HTTPException(
status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
detail=f"Failed to create task: {str(e)}"
)
@router.get("/", response_model=List[TaskResponse])
async def list_tasks(
user_id: str,
status: Optional[str] = None,
priority: Optional[str] = None,
limit: int = 50,
db: Session = Depends(get_db)
):
"""
List tasks for a user with optional filters.
Args:
user_id: User ID from authentication
status: Filter by status (active, completed, deleted)
priority: Filter by priority (low, medium, high)
limit: Maximum number of tasks to return
db: Database session
Returns:
List of tasks
"""
try:
query = db.query(TaskModel).filter(TaskModel.user_id == user_id)
# Apply filters
if status:
query = query.filter(TaskModel.status == status)
if priority:
query = query.filter(TaskModel.priority == priority)
# Exclude deleted tasks by default
if status != "deleted":
query = query.filter(TaskModel.status != "deleted")
# Order by due date, then created date
query = query.order_by(
TaskModel.due_date.asc().nulls_last(),
TaskModel.created_at.desc()
)
tasks = query.limit(limit).all()
logger.info(
"tasks_listed",
user_id=user_id,
count=len(tasks),
status=status,
priority=priority
)
return [TaskResponse(**task.to_dict()) for task in tasks]
except Exception as e:
logger.error("list_tasks_failed", error=str(e))
raise HTTPException(
status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
detail=f"Failed to list tasks: {str(e)}"
)
@router.get("/{task_id}", response_model=TaskResponse)
async def get_task(
task_id: str,
user_id: str,
db: Session = Depends(get_db)
):
"""
Get a specific task by ID.
Args:
task_id: Task ID
user_id: User ID from authentication
db: Database session
Returns:
Task details
"""
task = db.query(TaskModel).filter(
TaskModel.id == task_id,
TaskModel.user_id == user_id
).first()
if not task:
raise HTTPException(
status_code=status.HTTP_404_NOT_FOUND,
detail=f"Task {task_id} not found"
)
return TaskResponse(**task.to_dict())
@router.patch("/{task_id}", response_model=TaskResponse)
async def update_task(
task_id: str,
updates: TaskUpdate,
user_id: str,
db: Session = Depends(get_db)
):
"""
Update a task and publish task.updated event.
Args:
task_id: Task ID
updates: Fields to update
user_id: User ID from authentication
db: Database session
Returns:
Updated task
"""
task = db.query(TaskModel).filter(
TaskModel.id == task_id,
TaskModel.user_id == user_id
).first()
if not task:
raise HTTPException(
status_code=status.HTTP_404_NOT_FOUND,
detail=f"Task {task_id} not found"
)
try:
# Store old values for audit
old_values = task.to_dict()
# Apply updates
update_data = updates.dict(exclude_unset=True)
for field, value in update_data.items():
setattr(task, field, value)
db.commit()
db.refresh(task)
logger.info(
"task_updated",
task_id=str(task.id),
user_id=user_id,
updated_fields=list(update_data.keys())
)
# Publish events
await event_publisher.publish_task_event(
"task.updated",
str(task.id),
{
"old_values": old_values,
"new_values": task.to_dict(),
"updated_fields": list(update_data.keys())
}
)
await event_publisher.publish_task_update(
str(task.id),
"updated",
task.to_dict()
)
await event_publisher.publish_audit_event(
"Task",
str(task.id),
"UPDATE",
"user",
user_id,
old_values=old_values,
new_values=task.to_dict()
)
return TaskResponse(**task.to_dict())
except Exception as e:
logger.error("update_task_failed", task_id=task_id, error=str(e))
db.rollback()
raise HTTPException(
status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
detail=f"Failed to update task: {str(e)}"
)
@router.post("/{task_id}/complete", response_model=TaskResponse)
async def complete_task(
task_id: str,
user_id: str,
db: Session = Depends(get_db)
):
"""
Mark a task as complete and publish task.completed event.
This event triggers the recurring task service to generate next instance.
Args:
task_id: Task ID
user_id: User ID from authentication
db: Database session
Returns:
Completed task
"""
task = db.query(TaskModel).filter(
TaskModel.id == task_id,
TaskModel.user_id == user_id
).first()
if not task:
raise HTTPException(
status_code=status.HTTP_404_NOT_FOUND,
detail=f"Task {task_id} not found"
)
if task.status == "completed":
raise HTTPException(
status_code=status.HTTP_400_BAD_REQUEST,
detail=f"Task {task_id} is already completed"
)
try:
old_values = task.to_dict()
# Mark as completed
task.status = "completed"
task.completed_at = datetime.now(timezone.utc)
db.commit()
db.refresh(task)
logger.info(
"task_completed",
task_id=str(task.id),
user_id=user_id
)
# Publish events (triggers recurring service)
await event_publisher.publish_task_event(
"task.completed",
str(task.id),
{
"old_values": old_values,
"new_values": task.to_dict(),
"completed_at": task.completed_at.isoformat()
}
)
await event_publisher.publish_task_update(
str(task.id),
"completed",
task.to_dict()
)
await event_publisher.publish_audit_event(
"Task",
str(task.id),
"COMPLETE",
"user",
user_id,
old_values=old_values,
new_values=task.to_dict()
)
return TaskResponse(**task.to_dict())
except Exception as e:
logger.error("complete_task_failed", task_id=task_id, error=str(e))
db.rollback()
raise HTTPException(
status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
detail=f"Failed to complete task: {str(e)}"
)
@router.delete("/{task_id}")
async def delete_task(
task_id: str,
user_id: str,
db: Session = Depends(get_db)
):
"""
Soft delete a task and publish task.deleted event.
Args:
task_id: Task ID
user_id: User ID from authentication
db: Database session
Returns:
Deletion confirmation
"""
task = db.query(TaskModel).filter(
TaskModel.id == task_id,
TaskModel.user_id == user_id
).first()
if not task:
raise HTTPException(
status_code=status.HTTP_404_NOT_FOUND,
detail=f"Task {task_id} not found"
)
try:
old_values = task.to_dict()
# Soft delete
task.status = "deleted"
db.commit()
logger.info(
"task_deleted",
task_id=str(task.id),
user_id=user_id
)
# Publish events
await event_publisher.publish_task_event(
"task.deleted",
str(task.id),
{
"old_values": old_values
}
)
await event_publisher.publish_task_update(
str(task.id),
"deleted",
task.to_dict()
)
await event_publisher.publish_audit_event(
"Task",
str(task.id),
"DELETE",
"user",
user_id,
old_values=old_values
)
return {
"status": "deleted",
"task_id": str(task.id),
"message": "Task deleted successfully"
}
except Exception as e:
logger.error("delete_task_failed", task_id=task_id, error=str(e))
db.rollback()
raise HTTPException(
status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
detail=f"Failed to delete task: {str(e)}"
)
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