feat(meituan-coupon): 头图改为统一压缩(去掉大小阈值,全部拼缩放参数)
产品要求所有头图都压缩,不再按 image_size 阈值判定: - feed_image_url 改为无条件给图片 URL 拼 @375w_375h_1e_1c.webp(缩 124dp + 转 WebP) - 去掉 FEED_THUMB_SIZE_THRESHOLD 阈值常量;from_raw / 两处 DB 路不再传 image_size - image_size/image_type 两列保留用于分析/监控(GIF 占比、体积分布),采集逻辑不变 - 文档更新:head_image_url 现统一带缩放参数 注:读取侧统一压缩,部署后即对全部 feed 图生效,无需依赖 image_size 回填。
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chenshuobo
@@ -202,7 +202,7 @@ def feed(req: FeedRequest, db: Session = Depends(get_db)) -> FeedResponse:
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cards: list[CouponCard] = []
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for row in rows[:PAGE]:
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try:
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card = CouponCard.from_raw(row.raw or {}, image_size=row.image_size)
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card = CouponCard.from_raw(row.raw or {})
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except Exception: # noqa: BLE001
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continue
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if card.product_view_sign:
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@@ -288,7 +288,7 @@ def top_sales(req: TopSalesRequest, db: Session = Depends(get_db)) -> CouponList
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cards: list[CouponCard] = []
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for row in rows[:req.page_size]:
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try:
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card = CouponCard.from_raw(row.raw or {}, image_size=row.image_size)
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card = CouponCard.from_raw(row.raw or {})
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except Exception: # noqa: BLE001
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continue
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if card.product_view_sign:
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@@ -56,7 +56,7 @@ class MeituanCoupon(Base):
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original_price_cents: Mapped[int | None] = mapped_column(Integer, nullable=True)
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head_url: Mapped[str | None] = mapped_column(String(512), nullable=True)
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# 头图字节大小 / MIME 类型:采集时 HEAD head_url 得到(Content-Length / Content-Type)。
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# 供读取侧按 image_size 决定是否给图片 URL 拼缩放参数(124dp 卡片下原图,长尾到 17MB)。
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# 读取侧已统一压缩(不再按大小判定),这两列保留用于分析/监控(GIF 占比、体积分布等)。
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image_size: Mapped[int | None] = mapped_column(Integer, nullable=True) # 字节
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image_type: Mapped[str | None] = mapped_column(String(32), nullable=True) # 如 image/jpeg
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+10
-16
@@ -13,25 +13,19 @@ from pydantic import BaseModel, Field
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FeedStatus = Literal["ok", "empty", "degraded"]
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# ───────────────── 头图传输优化口子（按大小决定是否拼缩放参数） ─────────────────
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# ───────────────── 头图传输优化（统一缩放 + 转 WebP） ─────────────────
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# 美团图片 CDN 支持在 URL 后拼 @<w>w_<h>h_1e_1c[.webp] 让服务端缩放/转码。feed 卡片只占
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# 124dp(≈372px@3x),但库里 head_url 是原图(实测中位 137KB、长尾到 17MB),是首页 feed
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# 图片加载偏慢/卡顿的一个来源。采集时已把头图字节大小存进 meituan_coupon.image_size,
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# 这里据其决定是否给大图拼缩略参数(实测 124dp 缩略 + 转 WebP 可省 76–99%)。
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#
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# ⚠️ 口子待产品确定阈值:FEED_THUMB_SIZE_THRESHOLD=None 时**完全 passthrough、不改变现网行为**。
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# 产品定下阈值(如 300*1024)后改这里即可生效,无需动调用方。
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FEED_THUMB_SIZE_THRESHOLD: int | None = None # 超过多少字节才拼缩放参数;None=暂不启用
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# 124dp(≈372px@3x),而库里 head_url 是原图(实测中位 137KB、长尾到 17MB、GIF 均 4.8MB),
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# 是首页 feed 图片加载偏慢的来源。按产品要求,头图**统一**缩到 124dp + 转 WebP 再下发
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# (全部压缩、不设大小阈值),由美团 CDN 服务端缩放/转码,实测省 76–99% 体积。
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FEED_THUMB_PARAM = "@375w_375h_1e_1c.webp" # 124dp@3x 缩略 + 转 WebP
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def feed_image_url(head_url: str, image_size: int | None = None) -> str:
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"""据头图字节大小决定是否给 URL 拼缩放参数提速。阈值=None 或大小未知/不超阈值时返回原 URL。"""
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if not head_url or FEED_THUMB_SIZE_THRESHOLD is None:
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def feed_image_url(head_url: str) -> str:
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"""统一给头图 URL 拼缩放参数(缩到 124dp + 转 WebP),让美团 CDN 出小图;空 URL 原样返回。"""
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if not head_url:
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return head_url
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if image_size is not None and image_size >= FEED_THUMB_SIZE_THRESHOLD:
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return head_url.split("@")[0] + FEED_THUMB_PARAM
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return head_url
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return head_url.split("@")[0] + FEED_THUMB_PARAM
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# ───────────────── 券卡片（归一化后给客户端） ─────────────────
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@@ -66,7 +60,7 @@ class CouponCard(BaseModel):
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rating_label: str | None = Field(None, description="如 4.6分")
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@classmethod
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def from_raw(cls, item: dict[str, Any], image_size: int | None = None) -> CouponCard:
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def from_raw(cls, item: dict[str, Any]) -> CouponCard:
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cpd = item.get("couponPackDetail") or {}
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brand = item.get("brandInfo") or {}
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comm = item.get("commissionInfo") or {}
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@@ -115,7 +109,7 @@ class CouponCard(BaseModel):
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platform=platform,
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biz_line=biz_line,
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name=cpd.get("name") or "",
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head_image_url=feed_image_url(head_url, image_size),
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head_image_url=feed_image_url(head_url),
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brand_name=brand.get("brandName"),
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brand_logo_url=brand.get("brandLogoUrl"),
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sell_price=sell,
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+1
-1
@@ -173,7 +173,7 @@
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| `platform` | int | `1`=外卖/到家, `2`=到店 |
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| `biz_line` | int \| null | 到店子类:1到餐 2到综 3酒店 4门票 |
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| `name` | string | 商品名 |
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| `head_image_url` | string | 头图直链(美团原图)。**预留**:采集时已把头图字节大小记到 `meituan_coupon.image_size`,后续可按阈值在 URL 拼缩放参数(124dp 缩略+WebP,实测省 76–99%)提速;当前阈值未启用、直出原图、行为不变 |
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| `head_image_url` | string | 头图;后端已**统一**拼缩放参数 `@375w_375h_1e_1c.webp`(美团 CDN 服务端缩到 124dp + 转 WebP,实测省 76–99%),客户端直接用 |
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| `brand_name` | string \| null | 品牌名 |
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| `brand_logo_url` | string \| null | 品牌 logo |
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| `sell_price` | string | 现价 |
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