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import json
import logging
from pathlib import Path
from fastapi import APIRouter, Depends, HTTPException
from fastapi.responses import StreamingResponse
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
from app.database import get_db
from app.models.user import User
from app.models.project import Project
from app.models.generation_job import GenerationJob
from app.schemas.generation import GenerationStart, GenerationJobResponse
from app.services.auth import get_current_user
from app.pipeline.orchestrator import run_pipeline
logger = logging.getLogger(__name__)
router = APIRouter(prefix="/api/projects/{project_id}", tags=["generation"])
# Keep references to running pipeline tasks so they don't get garbage-collected
_running_tasks: set[asyncio.Task] = set()
def _launch_pipeline(job_id: int, resume: bool = False, chapter_ids: list[int] | None = None):
"""Launch pipeline as background task with error logging."""
async def _wrapper():
try:
await run_pipeline(job_id, resume=resume, chapter_ids=chapter_ids)
except Exception:
logger.exception("Pipeline failed for job %s", job_id)
task = asyncio.create_task(_wrapper())
_running_tasks.add(task)
task.add_done_callback(_running_tasks.discard)
# ── Asset endpoints ──────────────────────────────────────────────────
@router.get("/assets/images")
async def list_images(
project_id: int,
user: User = Depends(get_current_user),
db: AsyncSession = Depends(get_db),
):
"""List generated images for a project."""
result = await db.execute(
select(Project).where(Project.id == project_id, Project.user_id == user.id)
)
if not result.scalar_one_or_none():
raise HTTPException(status_code=404, detail="Project not found")
img_dir = Path("workdir/projects") / str(project_id) / "images"
if not img_dir.exists():
return []
files = sorted(f.name for f in img_dir.iterdir() if f.suffix.lower() in (".png", ".jpg", ".jpeg", ".webp"))
return files
# ── Generation endpoints ─────────────────────────────────────────────
@router.post("/generate", response_model=GenerationJobResponse, status_code=201)
async def start_generation(
project_id: int,
data: GenerationStart,
user: User = Depends(get_current_user),
db: AsyncSession = Depends(get_db),
):
result = await db.execute(
select(Project).where(Project.id == project_id, Project.user_id == user.id)
)
project = result.scalar_one_or_none()
if not project:
raise HTTPException(status_code=404, detail="Project not found")
job = GenerationJob(
project_id=project_id,
user_id=user.id,
episode_id=data.episode_id,
chapter_ids_json=data.chapter_ids,
status="queued",
current_stage="ingest",
progress_pct=0.0,
)
db.add(job)
await db.commit()
await db.refresh(job)
# Launch pipeline in background with error handling
_launch_pipeline(job.id, chapter_ids=data.chapter_ids)
return job
@router.get("/generate/jobs", response_model=list[GenerationJobResponse])
async def list_jobs(
project_id: int,
user: User = Depends(get_current_user),
db: AsyncSession = Depends(get_db),
):
result = await db.execute(
select(GenerationJob)
.where(GenerationJob.project_id == project_id, GenerationJob.user_id == user.id)
.order_by(GenerationJob.created_at.desc())
)
return list(result.scalars().all())
@router.get("/generate/jobs/{job_id}", response_model=GenerationJobResponse)
async def get_job(
project_id: int,
job_id: int,
user: User = Depends(get_current_user),
db: AsyncSession = Depends(get_db),
):
result = await db.execute(
select(GenerationJob).where(
GenerationJob.id == job_id,
GenerationJob.project_id == project_id,
GenerationJob.user_id == user.id,
)
)
job = result.scalar_one_or_none()
if not job:
raise HTTPException(status_code=404, detail="Job not found")
return job
@router.get("/generate/jobs/{job_id}/stream")
async def stream_progress(
project_id: int,
job_id: int,
user: User = Depends(get_current_user),
db: AsyncSession = Depends(get_db),
):
"""SSE endpoint for real-time generation progress."""
result = await db.execute(
select(GenerationJob).where(
GenerationJob.id == job_id,
GenerationJob.project_id == project_id,
GenerationJob.user_id == user.id,
)
)
job = result.scalar_one_or_none()
if not job:
raise HTTPException(status_code=404, detail="Job not found")
from app.database import async_session as session_factory
async def event_stream():
last_data = None
while True:
try:
async with session_factory() as session:
result = await session.execute(
select(GenerationJob).where(GenerationJob.id == job_id)
)
current_job = result.scalar_one_or_none()
if not current_job:
yield f"data: {json.dumps({'status': 'not_found'})}\n\n"
break
data = {
"status": current_job.status or "queued",
"stage": current_job.current_stage or "ingest",
"progress": current_job.progress_pct or 0,
"detail": (current_job.progress_detail or "")[:200],
"error": (current_job.error_message or "")[:500] if current_job.status == "failed" else None,
}
# Always send (even if same) so frontend knows connection is alive
yield f"data: {json.dumps(data)}\n\n"
last_data = data
if current_job.status in ("completed", "failed", "cancelled"):
break
except Exception:
logger.exception("SSE stream error for job %s", job_id)
yield f"data: {json.dumps({'status': 'error', 'detail': 'Server error'})}\n\n"
break
await asyncio.sleep(1)
return StreamingResponse(
event_stream(),
media_type="text/event-stream",
headers={
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
@router.post("/generate/retry", response_model=GenerationJobResponse, status_code=201)
async def retry_generation(
project_id: int,
user: User = Depends(get_current_user),
db: AsyncSession = Depends(get_db),
):
"""Retry the last failed job for a project, resuming from where it left off."""
result = await db.execute(
select(Project).where(Project.id == project_id, Project.user_id == user.id)
)
project = result.scalar_one_or_none()
if not project:
raise HTTPException(status_code=404, detail="Project not found")
# Find the last failed job
result = await db.execute(
select(GenerationJob)
.where(
GenerationJob.project_id == project_id,
GenerationJob.user_id == user.id,
GenerationJob.status == "failed",
)
.order_by(GenerationJob.created_at.desc())
.limit(1)
)
failed_job = result.scalar_one_or_none()
if not failed_job:
raise HTTPException(status_code=404, detail="No failed job to retry")
# Create new job, carrying over chapter_ids from failed job
job = GenerationJob(
project_id=project_id,
user_id=user.id,
episode_id=failed_job.episode_id,
chapter_ids_json=failed_job.chapter_ids_json,
status="queued",
current_stage="ingest",
progress_pct=0.0,
)
db.add(job)
await db.commit()
await db.refresh(job)
_launch_pipeline(job.id, resume=True, chapter_ids=failed_job.chapter_ids_json)
return job
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