feat(collectors) basic implementation of boring collectors; sender via http(s) to hard coded api route

internal/sender/http.go

@@ -0,0 +1,66 @@
+package sender
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+	"time"
+
+	"bugs.watch/agent/internal/aggregate"
+)
+
+type HTTPSender struct {
+	client   *http.Client
+	endpoint string
+}
+
+func NewHTTPSender(endpoint string) *HTTPSender {
+	return &HTTPSender{
+		client: &http.Client{
+			Timeout: 5 * time.Second,
+		},
+		endpoint: endpoint,
+	}
+}
+
+func (s *HTTPSender) Send(ctx context.Context, snap aggregate.Snapshot) error {
+	payload := SnapshotPayload{
+		Timestamp: snap.Timestamp,
+		CPUAvg:    snap.CPUAvg,
+		MemAvg:    snap.MemAvg,
+		DiskAvg:   snap.DiskAvg,
+		Uptime:    snap.Uptime,
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return err
+	}
+
+	req, err := http.NewRequestWithContext(
+		ctx,
+		http.MethodPost,
+		s.endpoint,
+		bytes.NewReader(body),
+	)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := s.client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	// We do not retry or branch yet.
+	// Any non-2xx is treated as a failure.
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return nil
+	}
+
+	return nil
+}