feat: 优化代理服务

internal/proxy/request_helpers.go

@@ -0,0 +1,63 @@
+package proxy
+
+import (
+	"bytes"
+	"compress/gzip"
+	"encoding/json"
+	app_errors "gpt-load/internal/errors"
+	"gpt-load/internal/models"
+	"io"
+	"net/http"
+
+	"github.com/sirupsen/logrus"
+)
+
+func (ps *ProxyServer) applyParamOverrides(bodyBytes []byte, group *models.Group) ([]byte, error) {
+	if len(group.ParamOverrides) == 0 || len(bodyBytes) == 0 {
+		return bodyBytes, nil
+	}
+
+	var requestData map[string]any
+	if err := json.Unmarshal(bodyBytes, &requestData); err != nil {
+		logrus.Warnf("failed to unmarshal request body for param override, passing through: %v", err)
+		return bodyBytes, nil
+	}
+
+	for key, value := range group.ParamOverrides {
+		requestData[key] = value
+	}
+
+	return json.Marshal(requestData)
+}
+
+// logUpstreamError provides a centralized way to log errors from upstream interactions.
+func logUpstreamError(context string, err error) {
+	if err == nil {
+		return
+	}
+	if app_errors.IsIgnorableError(err) {
+		logrus.Debugf("Ignorable upstream error in %s: %v", context, err)
+	} else {
+		logrus.Errorf("Upstream error in %s: %v", context, err)
+	}
+}
+
+// handleGzipCompression checks for gzip encoding and decompresses the body if necessary.
+func handleGzipCompression(resp *http.Response, bodyBytes []byte) []byte {
+	if resp.Header.Get("Content-Encoding") == "gzip" {
+		reader, gzipErr := gzip.NewReader(bytes.NewReader(bodyBytes))
+		if gzipErr != nil {
+			logrus.Warnf("Failed to create gzip reader for error body: %v", gzipErr)
+			return bodyBytes
+		}
+		defer reader.Close()
+
+		decompressedBody, readAllErr := io.ReadAll(reader)
+		if readAllErr != nil {
+			logrus.Warnf("Failed to decompress gzip error body: %v", readAllErr)
+			return bodyBytes
+		}
+		return decompressedBody
+	}
+	return bodyBytes
+}