Anthropic request headers helper (#233)

* Add helper function for preparing common request headers

* Rename variable to not collide with imported package

* Get rid of unnecessary variable colliding with imported package

* Enhancements to Anthropic setRequestHeaders()

* PR feedback

server/ai/anthropic/client.go

@@ -15,7 +15,6 @@ import (
 
 const (
 	MessageEndpoint = "https://api.anthropic.com/v1/messages"
-	APIKeyHeader    = "X-API-Key" //nolint:gosec
 
 	StopReasonStopSequence = "stop_sequence"
 	StopReasonMaxTokens    = "max_tokens"
@@ -97,9 +96,7 @@ func (c *Client) MessageCompletionNoStream(completionRequest MessageRequest) (st
 		return "", fmt.Errorf("could not create request: %w", err)
 	}
 
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("X-API-Key", c.apiKey)
-	req.Header.Set("anthropic-version", "2023-06-01")
+	c.setRequestHeaders(req, false)
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
@@ -135,11 +132,7 @@ func (c *Client) MessageCompletion(completionRequest MessageRequest) (*ai.TextSt
 		return nil, err
 	}
 
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("X-API-Key", c.apiKey)
-	req.Header.Set("Accept", "text/event-stream")
-	req.Header.Set("Connection", "keep-alive")
-	req.Header.Set("anthropic-version", "2023-06-01")
+	c.setRequestHeaders(req, true)
 
 	output := make(chan string)
 	errChan := make(chan error)
@@ -203,3 +196,14 @@ func (c *Client) MessageCompletion(completionRequest MessageRequest) (*ai.TextSt
 
 	return &ai.TextStreamResult{Stream: output, Err: errChan}, nil
 }
+
+func (c *Client) setRequestHeaders(req *http.Request, isStreaming bool) {
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-API-Key", c.apiKey)
+	req.Header.Set("anthropic-version", "2023-06-01")
+
+	if isStreaming {
+		req.Header.Set("Accept", "text/event-stream")
+		req.Header.Set("Connection", "keep-alive")
+	}
+}

server/metrics.go

@@ -19,12 +19,12 @@ func (p *Plugin) GetMetrics() metrics.Metrics {
 }
 
 func (p *Plugin) metricsMiddleware(c *gin.Context) {
-	metrics := p.GetMetrics()
-	if metrics == nil {
+	llmMetrics := p.GetMetrics()
+	if llmMetrics == nil {
 		c.Next()
 		return
 	}
-	p.GetMetrics().IncrementHTTPRequests()
+	llmMetrics.IncrementHTTPRequests()
 	now := time.Now()
 
 	c.Next()
@@ -34,9 +34,9 @@ func (p *Plugin) metricsMiddleware(c *gin.Context) {
 	status := c.Writer.Status()
 
 	if status < 200 || status > 299 {
-		p.GetMetrics().IncrementHTTPErrors()
+		llmMetrics.IncrementHTTPErrors()
 	}
 
 	endpoint := c.HandlerName()
-	p.GetMetrics().ObserveAPIEndpointDuration(endpoint, c.Request.Method, strconv.Itoa(status), elapsed)
+	llmMetrics.ObserveAPIEndpointDuration(endpoint, c.Request.Method, strconv.Itoa(status), elapsed)
 }

server/plugin.go

@@ -139,18 +139,18 @@ func (p *Plugin) OnDeactivate() error {
 }
 
 func (p *Plugin) getLLM(llmBotConfig ai.BotConfig) ai.LanguageModel {
-	metrics := p.metricsService.GetMetricsForAIService(llmBotConfig.Name)
+	llmMetrics := p.metricsService.GetMetricsForAIService(llmBotConfig.Name)
 
 	var llm ai.LanguageModel
 	switch llmBotConfig.Service.Type {
 	case "openai":
-		llm = openai.New(llmBotConfig.Service, metrics)
+		llm = openai.New(llmBotConfig.Service, llmMetrics)
 	case "openaicompatible":
-		llm = openai.NewCompatible(llmBotConfig.Service, metrics)
+		llm = openai.NewCompatible(llmBotConfig.Service, llmMetrics)
 	case "anthropic":
-		llm = anthropic.New(llmBotConfig.Service, metrics)
+		llm = anthropic.New(llmBotConfig.Service, llmMetrics)
 	case "asksage":
-		llm = asksage.New(llmBotConfig.Service, metrics)
+		llm = asksage.New(llmBotConfig.Service, llmMetrics)
 	}
 
 	cfg := p.getConfiguration()
@@ -172,12 +172,12 @@ func (p *Plugin) getTranscribe() ai.Transcriber {
 			break
 		}
 	}
-	metrics := p.metricsService.GetMetricsForAIService(botConfig.Name)
+	llmMetrics := p.metricsService.GetMetricsForAIService(botConfig.Name)
 	switch botConfig.Service.Type {
 	case "openai":
-		return openai.New(botConfig.Service, metrics)
+		return openai.New(botConfig.Service, llmMetrics)
 	case "openaicompatible":
-		return openai.NewCompatible(botConfig.Service, metrics)
+		return openai.NewCompatible(botConfig.Service, llmMetrics)
 	}
 	return nil
 }