refactor: Refactor: Consolidate Anthropic model requests into GeneralOpenAIRequest

- Refactor Anthropic adapter to work with the new Anthropic API and model requests
- Remove the default value for `MaxTokensToSample`
- Set `MaxTokens` to 500 instead of 1000000
- Use `system` messages as the system prompt instead of the first message

relay/channel/anthropic/adaptor.go

@@ -3,13 +3,14 @@ package anthropic
 import (
 	"errors"
 	"fmt"
+	"io"
+	"net/http"
+
 	"github.com/gin-gonic/gin"
 	"github.com/songquanpeng/one-api/relay/channel"
 	"github.com/songquanpeng/one-api/relay/channel/openai"
 	"github.com/songquanpeng/one-api/relay/model"
 	"github.com/songquanpeng/one-api/relay/util"
-	"io"
-	"net/http"
 )
 
 type Adaptor struct {

relay/channel/anthropic/main.go

@@ -28,37 +28,25 @@ func stopReasonClaude2OpenAI(reason string) string {
 
 func ConvertRequest(textRequest model.GeneralOpenAIRequest) *Request {
 	claudeRequest := Request{
-		Model:             textRequest.Model,
-		Prompt:            "",
-		MaxTokensToSample: textRequest.MaxTokens,
-		StopSequences:     nil,
-		Temperature:       textRequest.Temperature,
-		TopP:              textRequest.TopP,
-		Stream:            textRequest.Stream,
+		GeneralOpenAIRequest: textRequest,
 	}
-	if claudeRequest.MaxTokensToSample == 0 {
-		claudeRequest.MaxTokensToSample = 1000000
-	}
-	prompt := ""
 
-	// messages, err := textRequest.TextMessages()
-	// if err != nil {
-	// 	log.Panicf("invalid message type: %T", textRequest.Messages)
-	// }
+	if claudeRequest.MaxTokens == 0 {
+		claudeRequest.MaxTokens = 500 // max_tokens is required
+	}
 
-	for _, message := range textRequest.Messages {
-		if message.Role == "user" {
-			prompt += fmt.Sprintf("\n\nHuman: %s", message.Content)
-		} else if message.Role == "assistant" {
-			prompt += fmt.Sprintf("\n\nAssistant: %s", message.Content)
-		} else if message.Role == "system" {
-			if prompt == "" {
-				prompt = message.StringContent()
+	// anthropic's new messages API use system to represent the system prompt
+	var filteredMessages []model.Message
+	for _, msg := range claudeRequest.Messages {
+		if msg.Role != "system" {
+			filteredMessages = append(filteredMessages, msg)
+			continue
 		}
+
+		claudeRequest.System += msg.Content.(string)
 	}
-	}
-	prompt += "\n\nAssistant:"
-	claudeRequest.Prompt = prompt
+	claudeRequest.Messages = filteredMessages
+
 	return &claudeRequest
 }
 

relay/channel/anthropic/model.go

@@ -1,19 +1,17 @@
 package anthropic
 
+import (
+	"github.com/songquanpeng/one-api/relay/model"
+)
+
 type Metadata struct {
 	UserId string `json:"user_id"`
 }
 
 type Request struct {
-	Model             string   `json:"model"`
-	Prompt            string   `json:"prompt"`
-	MaxTokensToSample int      `json:"max_tokens_to_sample"`
-	StopSequences     []string `json:"stop_sequences,omitempty"`
-	Temperature       float64  `json:"temperature,omitempty"`
-	TopP              float64  `json:"top_p,omitempty"`
-	TopK              int      `json:"top_k,omitempty"`
-	//Metadata    `json:"metadata,omitempty"`
-	Stream bool `json:"stream,omitempty"`
+	model.GeneralOpenAIRequest
+	// System anthropic messages API use system to represent the system prompt
+	System string `json:"system"`
 }
 
 type Error struct {

relay/helper/main.go

@@ -3,7 +3,7 @@ package helper
 import (
 	"github.com/songquanpeng/one-api/relay/channel"
 	"github.com/songquanpeng/one-api/relay/channel/aiproxy"
-	// "github.com/songquanpeng/one-api/relay/channel/anthropic"
+	"github.com/songquanpeng/one-api/relay/channel/anthropic"
 	"github.com/songquanpeng/one-api/relay/channel/gemini"
 	"github.com/songquanpeng/one-api/relay/channel/openai"
 	"github.com/songquanpeng/one-api/relay/channel/palm"
@@ -17,8 +17,7 @@ func GetAdaptor(apiType int) channel.Adaptor {
 	// case constant.APITypeAli:
 	// 	return &ali.Adaptor{}
 	case constant.APITypeAnthropic:
-		// return &anthropic.Adaptor{}
-		return &openai.Adaptor{}
+		return &anthropic.Adaptor{}
 	// case constant.APITypeBaidu:
 	// 	return &baidu.Adaptor{}
 	case constant.APITypeGemini: