315 lines
11 KiB
Python
315 lines
11 KiB
Python
"""
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Chapter 封面生成 Celery 任务。
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从 chapter_cover_intents 原子 claim intent，或创建新 intent 后生成封面，
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写入 assets，绑定到 chapters.cover_asset_id。封面不回写进正文 markdown。
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"""
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import hashlib
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import uuid
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from datetime import datetime, timedelta, timezone
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from celery import shared_task
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from PIL import Image
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from sqlalchemy import and_, func, or_, select, update
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from sqlalchemy.orm import joinedload
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from app.core.db import get_sync_db
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from app.core.dependencies import get_image_generator
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from app.core.redis_lock import acquire_redis_lock, release_redis_lock
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from app.features.asset.models import Asset
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from app.features.memoir.chapter_cover import (
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aggregate_cover_prompt_from_chapter,
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aggregate_cover_prompt_from_stories,
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)
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from app.features.memoir.cover_eligibility import (
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chapter_eligible_for_cover_by_inline_body_image_count,
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)
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from app.features.memoir.memoir_images.storage import TencentCosStorageService
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from app.features.memoir.models import Chapter, ChapterCoverIntent, ChapterStoryLink
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from app.ports.image_gen import TaskStatus
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from app.core.logging import get_logger
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logger = get_logger(__name__)
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CHAPTER_COVER_LOCK_TTL_SECONDS = 1800
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CHAPTER_COVER_CLAIM_TTL_SECONDS = 1800
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def _build_cover_cos_key(user_id: str, chapter_id: str, prompt: str) -> str:
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short_hash = hashlib.sha1(prompt.encode("utf-8")).hexdigest()[:10]
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return f"chapters/{user_id}/{chapter_id}/cover-{short_hash}.png"
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def _normalize_image_bytes(image_bytes: bytes) -> bytes:
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from io import BytesIO
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with Image.open(BytesIO(image_bytes)) as image:
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output = BytesIO()
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if image.mode in {"RGBA", "LA"}:
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normalized = image
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elif image.mode == "P":
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normalized = image.convert("RGBA")
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else:
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normalized = image.convert("RGB")
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normalized.save(output, format="PNG")
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return output.getvalue()
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def _build_cover_prompt(prompt_brief: str) -> str:
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"""从 intent.prompt_brief 构建出图 prompt。"""
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from app.agents.memoir.prompts import IMAGE_PLACEHOLDER_TEMPLATE
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base = IMAGE_PLACEHOLDER_TEMPLATE
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if prompt_brief and prompt_brief.strip():
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return f"{base}。{prompt_brief.strip()}"
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return f"{base}。章节封面"
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def _chapter_cover_claimable_clause(now: datetime):
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cutoff = now - timedelta(seconds=CHAPTER_COVER_CLAIM_TTL_SECONDS)
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return or_(
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ChapterCoverIntent.status.in_(["pending", "failed"]),
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and_(
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ChapterCoverIntent.status == "processing",
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or_(
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ChapterCoverIntent.claimed_at.is_(None),
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ChapterCoverIntent.claimed_at < cutoff,
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),
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),
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)
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def _build_chapter_cover_brief(chapter: Chapter) -> str:
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prompt_brief = ""
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stories = []
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if getattr(chapter, "story_links", None):
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for link in sorted(
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chapter.story_links, key=lambda l: getattr(l, "order_index", 0)
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):
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story = getattr(link, "story", None)
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if story:
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stories.append(story)
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prompt_brief = aggregate_cover_prompt_from_stories(
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stories,
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chapter_title=chapter.title or "",
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chapter_category=chapter.category or "",
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)
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if prompt_brief:
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return prompt_brief
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md = (chapter.canonical_markdown or "").strip()
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excerpt = md[:200] if md else ""
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return aggregate_cover_prompt_from_chapter(
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chapter_title=chapter.title or "",
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chapter_category=chapter.category or "",
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markdown_excerpt=excerpt,
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)
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def _claim_chapter_cover_intent_sync(db, chapter: Chapter, claim_token: str):
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now = datetime.now(timezone.utc)
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claimable = _chapter_cover_claimable_clause(now)
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candidate_id = db.execute(
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select(ChapterCoverIntent.id)
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.where(ChapterCoverIntent.chapter_id == chapter.id)
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.where(claimable)
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.order_by(
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ChapterCoverIntent.updated_at.desc(), ChapterCoverIntent.created_at.desc()
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)
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.limit(1)
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).scalar_one_or_none()
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if candidate_id:
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claimed = db.execute(
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update(ChapterCoverIntent)
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.where(ChapterCoverIntent.id == candidate_id)
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.where(_chapter_cover_claimable_clause(now))
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.values(
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status="processing",
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claim_token=claim_token,
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claimed_at=now,
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updated_at=now,
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error=None,
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attempt_count=func.coalesce(ChapterCoverIntent.attempt_count, 0) + 1,
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)
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)
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if (claimed.rowcount or 0) != 1:
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db.rollback()
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return None
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intent = db.get(ChapterCoverIntent, candidate_id)
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db.commit()
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return intent
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cutoff = now - timedelta(seconds=CHAPTER_COVER_CLAIM_TTL_SECONDS)
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fresh_processing = db.execute(
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select(ChapterCoverIntent.id)
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.where(ChapterCoverIntent.chapter_id == chapter.id)
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.where(ChapterCoverIntent.status == "processing")
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.where(ChapterCoverIntent.claimed_at.is_not(None))
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.where(ChapterCoverIntent.claimed_at >= cutoff)
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.limit(1)
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).scalar_one_or_none()
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if fresh_processing:
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return None
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intent = ChapterCoverIntent(
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id=str(uuid.uuid4()),
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chapter_id=chapter.id,
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prompt_brief=_build_chapter_cover_brief(chapter),
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status="processing",
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claim_token=claim_token,
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claimed_at=now,
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attempt_count=1,
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)
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db.add(intent)
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db.flush()
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db.commit()
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return intent
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@shared_task(bind=True, max_retries=3, default_retry_delay=30)
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def generate_chapter_cover(self, chapter_id: str):
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"""
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为 chapter 生成封面。
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从 chapter_cover_intents 原子认领 intent，或创建新 intent 后生成，
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写入 assets 并绑定到 chapters.cover_asset_id。
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"""
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lock_key = f"lock:chapter-images:{chapter_id}"
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lock_handle = acquire_redis_lock(
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lock_key, ttl_seconds=CHAPTER_COVER_LOCK_TTL_SECONDS
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)
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if lock_handle is None:
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logger.info("generate_chapter_cover: chapter=%s, reason=locked", chapter_id)
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return {"status": "locked"}
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claim_token = uuid.uuid4().hex
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intent = None
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try:
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with get_sync_db() as db:
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stmt = (
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select(Chapter)
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.where(Chapter.id == chapter_id)
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.options(
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joinedload(Chapter.story_links).joinedload(ChapterStoryLink.story),
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)
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)
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chapter = db.execute(stmt).unique().scalar_one_or_none()
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if not chapter:
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logger.info(
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"generate_chapter_cover: chapter=%s, reason=not_found", chapter_id
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)
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return {"status": "no_chapter"}
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if not chapter_eligible_for_cover_by_inline_body_image_count(chapter):
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logger.info(
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"generate_chapter_cover: chapter=%s, reason=insufficient_inline_body_images",
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chapter_id,
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)
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return {"status": "insufficient_inline_body_images"}
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if getattr(chapter, "cover_asset_id", None):
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logger.info(
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"generate_chapter_cover: chapter=%s, reason=has_cover_asset",
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chapter_id,
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)
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return {"status": "already_has_asset"}
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intent = _claim_chapter_cover_intent_sync(db, chapter, claim_token)
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if not intent:
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logger.info(
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"generate_chapter_cover: chapter=%s, reason=no_claimable_intent",
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chapter_id,
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)
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return {"status": "no_intent"}
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try:
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image_generator = get_image_generator()
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storage = TencentCosStorageService.from_env()
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from app.features.memoir.memoir_images.settings import MemoirImageSettings
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settings = MemoirImageSettings.from_env()
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prompt_final = _build_cover_prompt(intent.prompt_brief or "")
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result = image_generator.generate(
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prompt_final,
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settings.default_size,
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settings.default_style,
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)
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if result.status != TaskStatus.COMPLETED or not result.image_url:
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raise RuntimeError(result.error or "Image generation failed")
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image_bytes = _normalize_image_bytes(
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image_generator.download_image(result.image_url)
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)
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cos_key = _build_cover_cos_key(chapter.user_id, chapter_id, prompt_final)
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url = storage.upload_bytes(image_bytes, cos_key, "image/png")
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asset_id = str(uuid.uuid4())
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with get_sync_db() as db:
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intent_db = db.get(ChapterCoverIntent, intent.id)
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if (
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not intent_db
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or (intent_db.status or "").strip() != "processing"
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or (intent_db.claim_token or "").strip() != claim_token
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):
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logger.info(
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"generate_chapter_cover: skip persist intent=%s status=%s claim=%s",
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intent.id,
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getattr(intent_db, "status", None),
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getattr(intent_db, "claim_token", None),
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)
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return {"status": "superseded_or_cancelled"}
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asset = Asset(
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id=asset_id,
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asset_type="chapter_cover",
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storage_key=cos_key,
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url=url,
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provider=settings.provider,
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style_profile=settings.default_style,
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prompt_final=prompt_final,
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status="completed",
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)
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db.add(asset)
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db.flush()
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intent_db.asset_id = asset_id
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intent_db.status = "completed"
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intent_db.claim_token = None
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intent_db.claimed_at = None
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intent_db.error = None
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intent_db.updated_at = datetime.now(timezone.utc)
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chapter_db = db.get(Chapter, chapter_id)
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chapter_db.cover_asset_id = asset_id
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db.commit()
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logger.info(
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"generate_chapter_cover: chapter=%s, asset=%s, url=%s",
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chapter_id,
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asset_id,
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url,
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)
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return {"status": "success", "asset_id": asset_id}
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except Exception as exc:
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if intent is not None:
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with get_sync_db() as db:
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intent_db = db.get(ChapterCoverIntent, intent.id)
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if (
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intent_db
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and (intent_db.claim_token or "").strip() == claim_token
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):
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intent_db.status = "failed"
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intent_db.claim_token = None
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intent_db.claimed_at = None
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intent_db.error = str(exc)
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intent_db.updated_at = datetime.now(timezone.utc)
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db.commit()
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logger.warning(
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"generate_chapter_cover failed: chapter=%s, error=%s", chapter_id, exc
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)
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raise self.retry(exc=exc)
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finally:
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release_redis_lock(lock_handle)
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