chore(Dockerfile): Update Dockerfile to use Alpine Linux and refactor package management

Update Dockerfile to use Alpine Linux for base image and refactor package management to use apk instead of apt. Also, clean up cache directories after installing packages.

Dockerfile

@@ -1,20 +1,20 @@
-FROM golang:1.23 AS builder
+FROM golang:1.23-bookworm AS builder
 
+ARG IMG_PATH=/opt/pics
 ARG EXHAUST_PATH=/opt/exhaust
 RUN apt update && apt install --no-install-recommends libvips-dev -y && mkdir /build
 COPY go.mod /build
 RUN cd /build && go mod download
 
 COPY . /build
-RUN cd /build && sed -i "s|\"\"|\"${EXHAUST_PATH}\"|g" config.json  \
+RUN cd /build && sed -i "s|.\/pics|${IMG_PATH}|g" config.json  \
+    && sed -i "s|\"\"|\"${EXHAUST_PATH}\"|g" config.json  \
     && sed -i 's/127.0.0.1/0.0.0.0/g' config.json  \
     && go build -ldflags="-s -w" -o webp-server .
 
-FROM alpine:latest
+FROM debian:bookworm-slim
 
-RUN apk update && \
+RUN apt update && apt install --no-install-recommends libvips ca-certificates -y && rm -rf /var/lib/apt/lists/* &&  rm -rf /var/cache/apt/archives/*
-    apk add --no-cache libvips ca-certificates && \
-    rm -rf /var/cache/apk/*
 
 COPY --from=builder /build/webp-server  /usr/bin/webp-server
 COPY --from=builder /build/config.json /etc/config.json
@@ -22,4 +22,3 @@ COPY --from=builder /build/config.json /etc/config.json
 WORKDIR /opt
 VOLUME /opt/exhaust
 CMD ["/usr/bin/webp-server", "--config", "/etc/config.json"]
-    

handler/remote.go

@@ -3,6 +3,7 @@ package handler
 import (
 	"fmt"
 	"io"
+	"mime"
 	"net/http"
 	"os"
 	"path"
@@ -125,3 +126,37 @@ func pingURL(url string) (string, int64, time.Time) {
 
 	return etag, size, lastModified
 }
+
+func streamFile(c *fiber.Ctx, filePath string) error {
+	file, err := os.Open(filePath)
+	if err != nil {
+		log.Errorf("无法打开文件: %s, 错误: %v", filePath, err)
+		return c.Status(fiber.StatusInternalServerError).SendString("无法打开文件")
+	}
+	defer file.Close()
+
+	stat, err := file.Stat()
+	if err != nil {
+		log.Errorf("无法获取文件信息: %s, 错误: %v", filePath, err)
+		return c.Status(fiber.StatusInternalServerError).SendString("无法获取文件信息")
+	}
+
+	contentType := mime.TypeByExtension(path.Ext(filePath))
+	if contentType == "" {
+		contentType = "application/octet-stream"
+	}
+
+	c.Set(fiber.HeaderContentType, contentType)
+	c.Set(fiber.HeaderContentLength, strconv.FormatInt(stat.Size(), 10))
+
+	log.Infof("开始流式传输文件: %s, 大小: %d bytes", filePath, stat.Size())
+
+	err = c.SendStream(file)
+	if err != nil {
+		log.Errorf("文件流式传输失败: %s, 错误: %v", filePath, err)
+		return err
+	}
+
+	log.Infof("文件流式传输完成: %s", filePath)
+	return nil
+}

handler/router.go

@@ -72,7 +72,7 @@ func Convert(c *fiber.Ctx) error {
 	// 检查文件是否已经在 EXHAUST_PATH 中
 	if helper.FileExists(exhaustFilename) {
 		log.Infof("文件已存在于 EXHAUST_PATH，直接提供服务: %s", exhaustFilename)
-		return c.SendFile(exhaustFilename)
+		return streamFile(c, exhaustFilename)
 	}
 
 	// 文件不在 EXHAUST_PATH 中，需要处理
@@ -110,7 +110,7 @@ func Convert(c *fiber.Ctx) error {
 	// 检查是否为允许的图片文件
 	if !helper.IsAllowedImageFile(filename) {
 		log.Infof("不允许的文件类型或非图片文件: %s", reqURI)
-		return c.SendFile(rawImageAbs)
+		return streamFile(c, rawImageAbs)
 	}
 
 	// 处理图片
@@ -148,5 +148,5 @@ func Convert(c *fiber.Ctx) error {
 		go schedule.ScheduleCleanup(rawImageAbs)
 	}
 
-	return c.SendFile(exhaustFilename)
+	return streamFile(c, exhaustFilename)
 }