refactor: use adaptor to do relay & test

relay/channel/common.go

@@ -0,0 +1,51 @@
+package channel
+
+import (
+	"errors"
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"github.com/songquanpeng/one-api/relay/util"
+	"io"
+	"net/http"
+)
+
+func SetupCommonRequestHeader(c *gin.Context, req *http.Request, meta *util.RelayMeta) {
+	req.Header.Set("Content-Type", c.Request.Header.Get("Content-Type"))
+	req.Header.Set("Accept", c.Request.Header.Get("Accept"))
+	if meta.IsStream && c.Request.Header.Get("Accept") == "" {
+		req.Header.Set("Accept", "text/event-stream")
+	}
+}
+
+func DoRequestHelper(a Adaptor, c *gin.Context, meta *util.RelayMeta, requestBody io.Reader) (*http.Response, error) {
+	fullRequestURL, err := a.GetRequestURL(meta)
+	if err != nil {
+		return nil, fmt.Errorf("get request url failed: %w", err)
+	}
+	req, err := http.NewRequest(c.Request.Method, fullRequestURL, requestBody)
+	if err != nil {
+		return nil, fmt.Errorf("new request failed: %w", err)
+	}
+	err = a.SetupRequestHeader(c, req, meta)
+	if err != nil {
+		return nil, fmt.Errorf("setup request header failed: %w", err)
+	}
+	resp, err := DoRequest(c, req)
+	if err != nil {
+		return nil, fmt.Errorf("do request failed: %w", err)
+	}
+	return resp, nil
+}
+
+func DoRequest(c *gin.Context, req *http.Request) (*http.Response, error) {
+	resp, err := util.HTTPClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	if resp == nil {
+		return nil, errors.New("resp is nil")
+	}
+	_ = req.Body.Close()
+	_ = c.Request.Body.Close()
+	return resp, nil
+}