feat: add gemini-2.0-flash-exp and fix race condition in processChannelRelayError (#1983)

Co-authored-by: JustSong <39998050+songquanpeng@users.noreply.github.com>

relay/adaptor/gemini/adaptor.go

@@ -24,7 +24,12 @@ func (a *Adaptor) Init(meta *meta.Meta) {
 }
 
 func (a *Adaptor) GetRequestURL(meta *meta.Meta) (string, error) {
-	version := helper.AssignOrDefault(meta.Config.APIVersion, config.GeminiVersion)
+	defaultVersion := config.GeminiVersion
+	if meta.ActualModelName == "gemini-2.0-flash-exp" {
+		defaultVersion = "v1beta"
+	}
+
+	version := helper.AssignOrDefault(meta.Config.APIVersion, defaultVersion)
 	action := ""
 	switch meta.Mode {
 	case relaymode.Embeddings:
@@ -36,6 +41,7 @@ func (a *Adaptor) GetRequestURL(meta *meta.Meta) (string, error) {
 	if meta.IsStream {
 		action = "streamGenerateContent?alt=sse"
 	}
+
 	return fmt.Sprintf("%s/%s/models/%s:%s", meta.BaseURL, version, meta.ActualModelName, action), nil
 }
 

relay/adaptor/gemini/constants.go

@@ -3,5 +3,8 @@ package gemini
 // https://ai.google.dev/models/gemini
 
 var ModelList = []string{
-	"gemini-pro", "gemini-1.0-pro", "gemini-1.5-flash", "gemini-1.5-pro", "text-embedding-004", "aqa",
+	"gemini-pro", "gemini-1.0-pro",
+	"gemini-1.5-flash", "gemini-1.5-pro",
+	"text-embedding-004", "aqa",
+	"gemini-2.0-flash-exp",
 }

relay/adaptor/vertexai/gemini/adapter.go

@@ -15,7 +15,10 @@ import (
 )
 
 var ModelList = []string{
-	"gemini-1.5-pro-001", "gemini-1.5-flash-001", "gemini-pro", "gemini-pro-vision", "gemini-1.5-pro-002", "gemini-1.5-flash-002",
+	"gemini-pro", "gemini-pro-vision",
+	"gemini-1.5-pro-001", "gemini-1.5-flash-001",
+	"gemini-1.5-pro-002", "gemini-1.5-flash-002",
+	"gemini-2.0-flash-exp",
 }
 
 type Adaptor struct {