refactor: refactor relay part (#935)

controller/model.go

@@ -2,8 +2,8 @@ package controller
 
 import (
 	"fmt"
-
 	"github.com/gin-gonic/gin"
+	"one-api/relay/channel/openai"
 )
 
 // https://platform.openai.com/docs/api-reference/models/list
@@ -613,14 +613,14 @@ func RetrieveModel(c *gin.Context) {
 	if model, ok := openAIModelsMap[modelId]; ok {
 		c.JSON(200, model)
 	} else {
-		openAIError := OpenAIError{
+		Error := openai.Error{
 			Message: fmt.Sprintf("The model '%s' does not exist", modelId),
 			Type:    "invalid_request_error",
 			Param:   "model",
 			Code:    "model_not_found",
 		}
 		c.JSON(200, gin.H{
-			"error": openAIError,
+			"error": Error,
 		})
 	}
 }