修复图表时间和查询区间不匹配问题

backend/internal/collector/agent.go

@@ -0,0 +1,96 @@
+package collector
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"time"
+)
+
+// AgentCollector Agent采集器
+ type AgentCollector struct {
+	agentURL string
+	client   *http.Client
+}
+
+// AgentMetrics Agent返回的监控指标
+ type AgentMetrics struct {
+	CPU    float64 `json:"cpu"`
+	Memory float64 `json:"memory"`
+	Disk   float64 `json:"disk"`
+	Network struct {
+		BytesSent     uint64 `json:"bytes_sent"`
+		BytesReceived uint64 `json:"bytes_received"`
+	} `json:"network"`
+}
+
+// NewAgentCollector 创建新的Agent采集器
+func NewAgentCollector(agentURL string) *AgentCollector {
+	return &AgentCollector{
+		agentURL: agentURL,
+		client: &http.Client{
+			Timeout: 10 * time.Second,
+		},
+	}
+}
+
+// GetMetrics 获取Agent监控指标
+func (c *AgentCollector) GetMetrics() (*AgentMetrics, error) {
+	// 发送HTTP请求到Agent
+	resp, err := c.client.Get(fmt.Sprintf("%s/metrics", c.agentURL))
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	// 检查响应状态码
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("agent returned status code %d", resp.StatusCode)
+	}
+
+	// 读取响应体
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	// 解析JSON响应
+	var metrics AgentMetrics
+	if err := json.Unmarshal(body, &metrics); err != nil {
+		return nil, err
+	}
+
+	return &metrics, nil
+}
+
+// GetCPUUsage 获取CPU使用率
+func (c *AgentCollector) GetCPUUsage() (float64, error) {
+	metrics, err := c.GetMetrics()
+	if err != nil {
+		return 0, err
+	}
+
+	return metrics.CPU, nil
+}
+
+// GetMemoryUsage 获取内存使用率
+func (c *AgentCollector) GetMemoryUsage() (float64, error) {
+	metrics, err := c.GetMetrics()
+	if err != nil {
+		return 0, err
+	}
+
+	return metrics.Memory, nil
+}
+
+// GetDiskUsage 获取磁盘使用率
+func (c *AgentCollector) GetDiskUsage(partition string) (float64, error) {
+	metrics, err := c.GetMetrics()
+	if err != nil {
+		return 0, err
+	}
+
+	// 目前Agent只返回整体磁盘使用率，忽略partition参数
+	return metrics.Disk, nil
+}