feat: implement hgctl agent & mcp add subcommand (#3051)

hgctl/pkg/agent/services/client.go

@@ -0,0 +1,113 @@
+// Copyright (c) 2025 Alibaba Group Holding Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package services
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+type HigressClient struct {
+	baseURL    string
+	username   string
+	password   string
+	httpClient *http.Client
+}
+
+func NewHigressClient(baseURL, username, password string) *HigressClient {
+	client := &HigressClient{
+		baseURL:  baseURL,
+		username: username,
+		password: password,
+		httpClient: &http.Client{
+			Timeout: 30 * time.Second,
+		},
+	}
+
+	return client
+}
+
+func (c *HigressClient) Get(path string) ([]byte, error) {
+	return c.request("GET", path, nil)
+}
+
+func (c *HigressClient) Post(path string, data interface{}) ([]byte, error) {
+	return c.request("POST", path, data)
+}
+
+func (c *HigressClient) Put(path string, data interface{}) ([]byte, error) {
+	return c.request("PUT", path, data)
+}
+
+func (c *HigressClient) Delete(path string) ([]byte, error) {
+	return c.request("DELETE", path, nil)
+}
+func (c *HigressClient) request(method, path string, data interface{}) ([]byte, error) {
+	url := c.baseURL + path
+
+	var body io.Reader
+	if data != nil {
+		jsonData, err := json.Marshal(data)
+		if err != nil {
+			return nil, fmt.Errorf("failed to marshal request data: %w", err)
+		}
+		body = bytes.NewBuffer(jsonData)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	req, err := http.NewRequestWithContext(ctx, method, url, body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.SetBasicAuth(c.username, c.password)
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 409 {
+		return nil, fmt.Errorf("resource already exists")
+	}
+
+	if resp.StatusCode == 400 {
+		return nil, fmt.Errorf("invalid resource definition")
+	}
+
+	if resp.StatusCode == 500 {
+		return nil, fmt.Errorf("server internal error")
+	}
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return nil, fmt.Errorf("HTTP error %d", resp.StatusCode)
+	}
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	return respBody, nil
+}