refactor: Simplify model mapping and pricing logic across relay modules

relay/helper/model_mapped.go

@@ -0,0 +1,25 @@
+package helper
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"one-api/relay/common"
+)
+
+func ModelMappedHelper(c *gin.Context, info *common.RelayInfo) error {
+	// map model name
+	modelMapping := c.GetString("model_mapping")
+	if modelMapping != "" && modelMapping != "{}" {
+		modelMap := make(map[string]string)
+		err := json.Unmarshal([]byte(modelMapping), &modelMap)
+		if err != nil {
+			return fmt.Errorf("unmarshal_model_mapping_failed")
+		}
+		if modelMap[info.OriginModelName] != "" {
+			info.UpstreamModelName = modelMap[info.OriginModelName]
+			info.IsModelMapped = true
+		}
+	}
+	return nil
+}

relay/helper/price.go

@@ -0,0 +1,41 @@
+package helper
+
+import (
+	"github.com/gin-gonic/gin"
+	"one-api/common"
+	relaycommon "one-api/relay/common"
+	"one-api/setting"
+)
+
+type PriceData struct {
+	ModelPrice             float64
+	ModelRatio             float64
+	GroupRatio             float64
+	UsePrice               bool
+	ShouldPreConsumedQuota int
+}
+
+func ModelPriceHelper(c *gin.Context, info *relaycommon.RelayInfo, promptTokens int, maxTokens int) PriceData {
+	modelPrice, usePrice := common.GetModelPrice(info.OriginModelName, false)
+	groupRatio := setting.GetGroupRatio(info.Group)
+	var preConsumedQuota int
+	var modelRatio float64
+	if !usePrice {
+		preConsumedTokens := common.PreConsumedQuota
+		if maxTokens != 0 {
+			preConsumedTokens = promptTokens + maxTokens
+		}
+		modelRatio = common.GetModelRatio(info.OriginModelName)
+		ratio := modelRatio * groupRatio
+		preConsumedQuota = int(float64(preConsumedTokens) * ratio)
+	} else {
+		preConsumedQuota = int(modelPrice * common.QuotaPerUnit * groupRatio)
+	}
+	return PriceData{
+		ModelPrice:             modelPrice,
+		ModelRatio:             modelRatio,
+		GroupRatio:             groupRatio,
+		UsePrice:               usePrice,
+		ShouldPreConsumedQuota: preConsumedQuota,
+	}
+}