feat(llama): add llama.cpp HTTP client for completion and embedding

internal/llama/client.go

@@ -0,0 +1,103 @@
+package llama
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+type Client struct {
+	baseURL    string
+	httpClient *http.Client
+}
+
+type CompletionRequest struct {
+	Prompt      string  `json:"prompt"`
+	Temperature float64 `json:"temperature"`
+	TopP        float64 `json:"top_p"`
+	MaxTokens   int     `json:"n_predict"`
+	Stream      bool    `json:"stream"`
+	CachePrompt bool    `json:"cache_prompt"`
+}
+
+type CompletionResponse struct {
+	Content string `json:"content"`
+	Tokens  int    `json:"tokens_predicted"`
+	Timings struct {
+		PredictedPerSecond float64 `json:"predicted_per_second"`
+	} `json:"timings"`
+}
+
+type EmbeddingRequest struct {
+	Content string `json:"content"`
+}
+
+type EmbeddingResponse struct {
+	Embedding []float64 `json:"embedding"`
+}
+
+func NewClient(baseURL string) *Client {
+	return &Client{
+		baseURL: baseURL,
+		httpClient: &http.Client{
+			Timeout: 120 * time.Second,
+		},
+	}
+}
+
+func (c *Client) Health() error {
+	resp, err := c.httpClient.Get(c.baseURL + "/health")
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("llama.cpp health check failed: %s", resp.Status)
+	}
+	return nil
+}
+
+func (c *Client) Complete(req *CompletionRequest) (*CompletionResponse, error) {
+	body, err := json.Marshal(req)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := c.httpClient.Post(c.baseURL+"/completion", "application/json", bytes.NewReader(body))
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		data, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf("llama.cpp completion failed (%d): %s", resp.StatusCode, string(data))
+	}
+	var res CompletionResponse
+	if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
+		return nil, err
+	}
+	return &res, nil
+}
+
+func (c *Client) Embed(content string) ([]float64, error) {
+	body, err := json.Marshal(EmbeddingRequest{Content: content})
+	if err != nil {
+		return nil, err
+	}
+	resp, err := c.httpClient.Post(c.baseURL+"/embedding", "application/json", bytes.NewReader(body))
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		data, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf("llama.cpp embedding failed (%d): %s", resp.StatusCode, string(data))
+	}
+	var res EmbeddingResponse
+	if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
+		return nil, err
+	}
+	return res.Embedding, nil
+}