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/constant/api_type.go

@@ -1,48 +0,0 @@
-package constant
-
-import (
-	"github.com/songquanpeng/one-api/common"
-)
-
-const (
-	APITypeOpenAI = iota
-	APITypeAnthropic
-	APITypePaLM
-	APITypeBaidu
-	APITypeZhipu
-	APITypeAli
-	APITypeXunfei
-	APITypeAIProxyLibrary
-	APITypeTencent
-	APITypeGemini
-	APITypeOllama
-
-	APITypeDummy // this one is only for count, do not add any channel after this
-)
-
-func ChannelType2APIType(channelType int) int {
-	apiType := APITypeOpenAI
-	switch channelType {
-	case common.ChannelTypeAnthropic:
-		apiType = APITypeAnthropic
-	case common.ChannelTypeBaidu:
-		apiType = APITypeBaidu
-	case common.ChannelTypePaLM:
-		apiType = APITypePaLM
-	case common.ChannelTypeZhipu:
-		apiType = APITypeZhipu
-	case common.ChannelTypeAli:
-		apiType = APITypeAli
-	case common.ChannelTypeXunfei:
-		apiType = APITypeXunfei
-	case common.ChannelTypeAIProxyLibrary:
-		apiType = APITypeAIProxyLibrary
-	case common.ChannelTypeTencent:
-		apiType = APITypeTencent
-	case common.ChannelTypeGemini:
-		apiType = APITypeGemini
-	case common.ChannelTypeOllama:
-		apiType = APITypeOllama
-	}
-	return apiType
-}

relay/constant/image.go

@@ -1,24 +0,0 @@
-package constant
-
-var DalleSizeRatios = map[string]map[string]float64{
-	"dall-e-2": {
-		"256x256":   1,
-		"512x512":   1.125,
-		"1024x1024": 1.25,
-	},
-	"dall-e-3": {
-		"1024x1024": 1,
-		"1024x1792": 2,
-		"1792x1024": 2,
-	},
-}
-
-var DalleGenerationImageAmounts = map[string][2]int{
-	"dall-e-2": {1, 10},
-	"dall-e-3": {1, 1}, // OpenAI allows n=1 currently.
-}
-
-var DalleImagePromptLengthLimitations = map[string]int{
-	"dall-e-2": 1000,
-	"dall-e-3": 4000,
-}

relay/constant/relay_mode.go

@@ -1,42 +0,0 @@
-package constant
-
-import "strings"
-
-const (
-	RelayModeUnknown = iota
-	RelayModeChatCompletions
-	RelayModeCompletions
-	RelayModeEmbeddings
-	RelayModeModerations
-	RelayModeImagesGenerations
-	RelayModeEdits
-	RelayModeAudioSpeech
-	RelayModeAudioTranscription
-	RelayModeAudioTranslation
-)
-
-func Path2RelayMode(path string) int {
-	relayMode := RelayModeUnknown
-	if strings.HasPrefix(path, "/v1/chat/completions") {
-		relayMode = RelayModeChatCompletions
-	} else if strings.HasPrefix(path, "/v1/completions") {
-		relayMode = RelayModeCompletions
-	} else if strings.HasPrefix(path, "/v1/embeddings") {
-		relayMode = RelayModeEmbeddings
-	} else if strings.HasSuffix(path, "embeddings") {
-		relayMode = RelayModeEmbeddings
-	} else if strings.HasPrefix(path, "/v1/moderations") {
-		relayMode = RelayModeModerations
-	} else if strings.HasPrefix(path, "/v1/images/generations") {
-		relayMode = RelayModeImagesGenerations
-	} else if strings.HasPrefix(path, "/v1/edits") {
-		relayMode = RelayModeEdits
-	} else if strings.HasPrefix(path, "/v1/audio/speech") {
-		relayMode = RelayModeAudioSpeech
-	} else if strings.HasPrefix(path, "/v1/audio/transcriptions") {
-		relayMode = RelayModeAudioTranscription
-	} else if strings.HasPrefix(path, "/v1/audio/translations") {
-		relayMode = RelayModeAudioTranslation
-	}
-	return relayMode
-}