feat: add custom restful backend for complex scenarios (e.g, rag)

README.md

@@ -343,6 +343,7 @@ Unused:
 > noopai
 > googlevertexai
 > watsonxai
+> customrest
 ```
 
 For detailed documentation on how to configure and use each provider see [here](https://docs.k8sgpt.ai/reference/providers/backend/).

pkg/ai/customrest.go

@@ -0,0 +1,147 @@
+package ai
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+const CustomRestClientName = "customrest"
+
+type CustomRestClient struct {
+	nopCloser
+	client      *http.Client
+	base        *url.URL
+	token       string
+	model       string
+	temperature float32
+	topP        float32
+	topK        int32
+}
+
+type CustomRestRequest struct {
+	Model string `json:"model"`
+
+	// Prompt is the textual prompt to send to the model.
+	Prompt string `json:"prompt"`
+
+	// Options lists model-specific options. For example, temperature can be
+	// set through this field, if the model supports it.
+	Options map[string]interface{} `json:"options"`
+}
+
+type CustomRestResponse struct {
+	// Model is the model name that generated the response.
+	Model string `json:"model"`
+
+	// CreatedAt is the timestamp of the response.
+	CreatedAt time.Time `json:"created_at"`
+
+	// Response is the textual response itself.
+	Response string `json:"response"`
+}
+
+func (c *CustomRestClient) Configure(config IAIConfig) error {
+	baseURL := config.GetBaseURL()
+	if baseURL == "" {
+		baseURL = defaultBaseURL
+	}
+	c.token = config.GetPassword()
+	baseClientURL, err := url.Parse(baseURL)
+	if err != nil {
+		return err
+	}
+	c.base = baseClientURL
+
+	proxyEndpoint := config.GetProxyEndpoint()
+	c.client = http.DefaultClient
+	if proxyEndpoint != "" {
+		proxyUrl, err := url.Parse(proxyEndpoint)
+		if err != nil {
+			return err
+		}
+		transport := &http.Transport{
+			Proxy: http.ProxyURL(proxyUrl),
+		}
+
+		c.client = &http.Client{
+			Transport: transport,
+		}
+	}
+
+	c.model = config.GetModel()
+	if c.model == "" {
+		c.model = defaultModel
+	}
+	c.temperature = config.GetTemperature()
+	c.topP = config.GetTopP()
+	c.topK = config.GetTopK()
+	return nil
+}
+
+func (c *CustomRestClient) GetCompletion(ctx context.Context, prompt string) (string, error) {
+	var promptDetail struct {
+		Language string `json:"language,omitempty"`
+		Message  string `json:"message"`
+		Prompt   string `json:"prompt,omitempty"`
+	}
+	prompt = strings.NewReplacer("\n", "\\n", "\t", "\\t").Replace(prompt)
+	if err := json.Unmarshal([]byte(prompt), &promptDetail); err != nil {
+		return "", err
+	}
+	generateRequest := &CustomRestRequest{
+		Model:  c.model,
+		Prompt: promptDetail.Prompt,
+		Options: map[string]interface{}{
+			"temperature": c.temperature,
+			"top_p":       c.topP,
+			"top_k":       c.topK,
+			"message":     promptDetail.Message,
+			"language":    promptDetail.Language,
+		},
+	}
+	requestBody, err := json.Marshal(generateRequest)
+	if err != nil {
+		return "", err
+	}
+	request, err := http.NewRequestWithContext(ctx, http.MethodPost, c.base.String(), bytes.NewBuffer(requestBody))
+	if err != nil {
+		return "", err
+	}
+	if c.token != "" {
+		request.Header.Set("Authorization", "Bearer "+c.token)
+	}
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("Accept", "application/x-ndjson")
+
+	response, err := c.client.Do(request)
+	if err != nil {
+		return "", err
+	}
+	defer response.Body.Close()
+
+	responseBody, err := io.ReadAll(response.Body)
+	if err != nil {
+		return "", fmt.Errorf("could not read response body: %w", err)
+	}
+
+	if response.StatusCode >= http.StatusBadRequest {
+		return "", fmt.Errorf("Request Error, StatusCode: %d, ErrorMessage: %s", response.StatusCode, responseBody)
+	}
+
+	var result CustomRestResponse
+	if err := json.Unmarshal(responseBody, &result); err != nil {
+		return "", err
+	}
+	return result.Response, nil
+}
+
+func (c *CustomRestClient) GetName() string {
+	return CustomRestClientName
+}

pkg/ai/iai.go

@@ -33,6 +33,7 @@ var (
 		&GoogleVertexAIClient{},
 		&OCIGenAIClient{},
 		&WatsonxAIClient{},
+		&CustomRestClient{},
 	}
 	Backends = []string{
 		openAIClientName,
@@ -48,6 +49,7 @@ var (
 		googleVertexAIClientName,
 		ociClientName,
 		watsonxAIClientName,
+		CustomRestClientName,
 	}
 )
 
@@ -181,7 +183,7 @@ func (p *AIProvider) GetCustomHeaders() []http.Header {
 	return p.CustomHeaders
 }
 
-var passwordlessProviders = []string{"localai", "ollama", "amazonsagemaker", "amazonbedrock", "googlevertexai", "oci"}
+var passwordlessProviders = []string{"localai", "ollama", "amazonsagemaker", "amazonbedrock", "googlevertexai", "oci", "customrest"}
 
 func NeedPassword(backend string) bool {
 	for _, b := range passwordlessProviders {

pkg/ai/prompts.go

@@ -58,9 +58,11 @@ const (
 
 	Solution: {kubectl command}
 	`
+	raw_promt = `{"language": "%s","message": "%s","prompt": "%s"}`
 )
 
 var PromptMap = map[string]string{
+	"raw":                           raw_promt,
 	"default":                       default_prompt,
 	"VulnerabilityReport":           trivy_vuln_prompt, // for Trivy integration, the key should match `Result.Kind` in pkg/common/types.go
 	"ConfigAuditReport":             trivy_conf_prompt,

pkg/analysis/analysis.go

@@ -397,6 +397,9 @@ func (a *Analysis) getAIResultForSanitizedFailures(texts []string, promptTmpl st
 
 	// Process template.
 	prompt := fmt.Sprintf(strings.TrimSpace(promptTmpl), a.Language, inputKey)
+	if a.AIClient.GetName() == ai.CustomRestClientName {
+		prompt = fmt.Sprintf(ai.PromptMap["raw"], a.Language, inputKey, prompt)
+	}
 	response, err := a.AIClient.GetCompletion(a.Context, prompt)
 	if err != nil {
 		return "", err