feat(store): add Golang client (#1977)

This adds a basic store client for Go

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

core/clients/store.go

@@ -0,0 +1,151 @@
+package clients
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+)
+
+// Define a struct to hold the store API client
+type StoreClient struct {
+	BaseURL string
+	Client  *http.Client
+}
+
+type SetRequest struct {
+	Keys   [][]float32 `json:"keys"`
+	Values []string    `json:"values"`
+}
+
+type GetRequest struct {
+	Keys [][]float32 `json:"keys"`
+}
+
+type GetResponse struct {
+	Keys   [][]float32 `json:"keys"`
+	Values []string    `json:"values"`
+}
+
+type DeleteRequest struct {
+	Keys [][]float32 `json:"keys"`
+}
+
+type FindRequest struct {
+	TopK int       `json:"topk"`
+	Key  []float32 `json:"key"`
+}
+
+type FindResponse struct {
+	Keys         [][]float32 `json:"keys"`
+	Values       []string    `json:"values"`
+	Similarities []float32   `json:"similarities"`
+}
+
+// Constructor for StoreClient
+func NewStoreClient(baseUrl string) *StoreClient {
+	return &StoreClient{
+		BaseURL: baseUrl,
+		Client:  &http.Client{},
+	}
+}
+
+// Implement Set method
+func (c *StoreClient) Set(req SetRequest) error {
+	return c.doRequest("stores/set", req)
+}
+
+// Implement Get method
+func (c *StoreClient) Get(req GetRequest) (*GetResponse, error) {
+	body, err := c.doRequestWithResponse("stores/get", req)
+	if err != nil {
+		return nil, err
+	}
+
+	var resp GetResponse
+	err = json.Unmarshal(body, &resp)
+	if err != nil {
+		return nil, err
+	}
+
+	return &resp, nil
+}
+
+// Implement Delete method
+func (c *StoreClient) Delete(req DeleteRequest) error {
+	return c.doRequest("stores/delete", req)
+}
+
+// Implement Find method
+func (c *StoreClient) Find(req FindRequest) (*FindResponse, error) {
+	body, err := c.doRequestWithResponse("stores/find", req)
+	if err != nil {
+		return nil, err
+	}
+
+	var resp FindResponse
+	err = json.Unmarshal(body, &resp)
+	if err != nil {
+		return nil, err
+	}
+
+	return &resp, nil
+}
+
+// Helper function to perform a request without expecting a response body
+func (c *StoreClient) doRequest(path string, data interface{}) error {
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+
+	req, err := http.NewRequest("POST", c.BaseURL+"/"+path, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := c.Client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("API request to %s failed with status code %d", path, resp.StatusCode)
+	}
+
+	return nil
+}
+
+// Helper function to perform a request and parse the response body
+func (c *StoreClient) doRequestWithResponse(path string, data interface{}) ([]byte, error) {
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequest("POST", c.BaseURL+"/"+path, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := c.Client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("API request to %s failed with status code %d", path, resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	return body, nil
+}