Refactor codebase, introduce relaymode package, update constants and improve consistency

- Refactor constant definitions and organization
- Clean up package level variables and functions
- Introduce new `relaymode` and `apitype` packages for constant definitions
- Refactor and simplify code in several packages including `openai`, `relay/channel/baidu`, `relay/util`, `relay/controller`, `relay/channeltype`
- Add helper functions in `relay/channeltype` package to convert channel type constants to corresponding API type constants
- Remove deprecated functions such as `ResponseText2Usage` from `relay/channel/openai/helper.go`
- Modify code in `relay/util/validation.go` and related files to use new `validator.ValidateTextRequest` function
- Rename `util` package to `relaymode` and update related imports in several packages

relay/controller/audio.go

@@ -6,20 +6,23 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io"
-	"net/http"
-	"strings"
-
 	"github.com/Laisky/errors/v2"
 	"github.com/gin-gonic/gin"
 	"github.com/songquanpeng/one-api/common"
 	"github.com/songquanpeng/one-api/common/config"
 	"github.com/songquanpeng/one-api/common/logger"
 	"github.com/songquanpeng/one-api/model"
-	"github.com/songquanpeng/one-api/relay/channel/openai"
-	"github.com/songquanpeng/one-api/relay/constant"
+	"github.com/songquanpeng/one-api/relay/adaptor/azure"
+	"github.com/songquanpeng/one-api/relay/adaptor/openai"
+	"github.com/songquanpeng/one-api/relay/billing"
+	billingratio "github.com/songquanpeng/one-api/relay/billing/ratio"
+	"github.com/songquanpeng/one-api/relay/channeltype"
+	"github.com/songquanpeng/one-api/relay/client"
 	relaymodel "github.com/songquanpeng/one-api/relay/model"
-	"github.com/songquanpeng/one-api/relay/util"
+	"github.com/songquanpeng/one-api/relay/relaymode"
+	"io"
+	"net/http"
+	"strings"
 )
 
 func RelayAudioHelper(c *gin.Context, relayMode int) *relaymodel.ErrorWithStatusCode {
@@ -34,7 +37,7 @@ func RelayAudioHelper(c *gin.Context, relayMode int) *relaymodel.ErrorWithStatus
 	tokenName := c.GetString("token_name")
 
 	var ttsRequest openai.TextToSpeechRequest
-	if relayMode == constant.RelayModeAudioSpeech {
+	if relayMode == relaymode.AudioSpeech {
 		// Read JSON
 		err := common.UnmarshalBodyReusable(c, &ttsRequest)
 		// Check if JSON is valid
@@ -48,14 +51,15 @@ func RelayAudioHelper(c *gin.Context, relayMode int) *relaymodel.ErrorWithStatus
 		}
 	}
 
-	modelRatio := common.GetModelRatio(audioModel)
-	// groupRatio := common.GetGroupRatio(group)
-	groupRatio := c.GetFloat64("channel_ratio")
+	modelRatio := billingratio.GetModelRatio(audioModel)
+	// groupRatio := billingratio.GetGroupRatio(group)
+	groupRatio := c.GetFloat64("channel_ratio") // get minimal ratio from multiple groups
+
 	ratio := modelRatio * groupRatio
 	var quota int64
 	var preConsumedQuota int64
 	switch relayMode {
-	case constant.RelayModeAudioSpeech:
+	case relaymode.AudioSpeech:
 		preConsumedQuota = int64(float64(len(ttsRequest.Input)) * ratio)
 		quota = preConsumedQuota
 	default:
@@ -117,19 +121,19 @@ func RelayAudioHelper(c *gin.Context, relayMode int) *relaymodel.ErrorWithStatus
 		}
 	}
 
-	baseURL := common.ChannelBaseURLs[channelType]
+	baseURL := channeltype.ChannelBaseURLs[channelType]
 	requestURL := c.Request.URL.String()
 	if c.GetString("base_url") != "" {
 		baseURL = c.GetString("base_url")
 	}
 
-	fullRequestURL := util.GetFullRequestURL(baseURL, requestURL, channelType)
-	if channelType == common.ChannelTypeAzure {
-		apiVersion := util.GetAzureAPIVersion(c)
-		if relayMode == constant.RelayModeAudioTranscription {
+	fullRequestURL := openai.GetFullRequestURL(baseURL, requestURL, channelType)
+	if channelType == channeltype.Azure {
+		apiVersion := azure.GetAPIVersion(c)
+		if relayMode == relaymode.AudioTranscription {
 			// https://learn.microsoft.com/en-us/azure/ai-services/openai/whisper-quickstart?tabs=command-line#rest-api
 			fullRequestURL = fmt.Sprintf("%s/openai/deployments/%s/audio/transcriptions?api-version=%s", baseURL, audioModel, apiVersion)
-		} else if relayMode == constant.RelayModeAudioSpeech {
+		} else if relayMode == relaymode.AudioSpeech {
 			// https://learn.microsoft.com/en-us/azure/ai-services/openai/text-to-speech-quickstart?tabs=command-line#rest-api
 			fullRequestURL = fmt.Sprintf("%s/openai/deployments/%s/audio/speech?api-version=%s", baseURL, audioModel, apiVersion)
 		}
@@ -148,7 +152,7 @@ func RelayAudioHelper(c *gin.Context, relayMode int) *relaymodel.ErrorWithStatus
 		return openai.ErrorWrapper(err, "new_request_failed", http.StatusInternalServerError)
 	}
 
-	if (relayMode == constant.RelayModeAudioTranscription || relayMode == constant.RelayModeAudioSpeech) && channelType == common.ChannelTypeAzure {
+	if (relayMode == relaymode.AudioTranscription || relayMode == relaymode.AudioSpeech) && channelType == channeltype.Azure {
 		// https://learn.microsoft.com/en-us/azure/ai-services/openai/whisper-quickstart?tabs=command-line#rest-api
 		apiKey := c.Request.Header.Get("Authorization")
 		apiKey = strings.TrimPrefix(apiKey, "Bearer ")
@@ -160,7 +164,7 @@ func RelayAudioHelper(c *gin.Context, relayMode int) *relaymodel.ErrorWithStatus
 	req.Header.Set("Content-Type", c.Request.Header.Get("Content-Type"))
 	req.Header.Set("Accept", c.Request.Header.Get("Accept"))
 
-	resp, err := util.HTTPClient.Do(req)
+	resp, err := client.HTTPClient.Do(req)
 	if err != nil {
 		return openai.ErrorWrapper(err, "do_request_failed", http.StatusInternalServerError)
 	}
@@ -174,7 +178,7 @@ func RelayAudioHelper(c *gin.Context, relayMode int) *relaymodel.ErrorWithStatus
 		return openai.ErrorWrapper(err, "close_request_body_failed", http.StatusInternalServerError)
 	}
 
-	if relayMode != constant.RelayModeAudioSpeech {
+	if relayMode != relaymode.AudioSpeech {
 		responseBody, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return openai.ErrorWrapper(err, "read_response_body_failed", http.StatusInternalServerError)
@@ -213,12 +217,12 @@ func RelayAudioHelper(c *gin.Context, relayMode int) *relaymodel.ErrorWithStatus
 		resp.Body = io.NopCloser(bytes.NewBuffer(responseBody))
 	}
 	if resp.StatusCode != http.StatusOK {
-		return util.RelayErrorHandler(resp)
+		return RelayErrorHandler(resp)
 	}
 	succeed = true
 	quotaDelta := quota - preConsumedQuota
 	defer func(ctx context.Context) {
-		go util.PostConsumeQuota(ctx, tokenId, quotaDelta, quota, userId, channelId, modelRatio, groupRatio, audioModel, tokenName)
+		go billing.PostConsumeQuota(ctx, tokenId, quotaDelta, quota, userId, channelId, modelRatio, groupRatio, audioModel, tokenName)
 	}(c.Request.Context())
 
 	for k, v := range resp.Header {