init work of uptime

internal/alert/discord.go

@@ -0,0 +1,40 @@
+package alert
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+type DiscordAlerter struct {
+	webhookURL string
+	client     *http.Client
+}
+
+func NewDiscordAlerter(webhookURL string) *DiscordAlerter {
+	return &DiscordAlerter{
+		webhookURL: webhookURL,
+		client:     &http.Client{Timeout: 10 * time.Second},
+	}
+}
+
+func (d *DiscordAlerter) Send(subject, body string) error {
+	payload, err := json.Marshal(map[string]string{"content": body})
+	if err != nil {
+		return fmt.Errorf("marshal payload: %w", err)
+	}
+
+	resp, err := d.client.Post(d.webhookURL, "application/json", bytes.NewReader(payload))
+	if err != nil {
+		return fmt.Errorf("post webhook: %w", err)
+	}
+	defer resp.Body.Close()
+
+	// Discord returns 204 No Content on success.
+	if resp.StatusCode != http.StatusNoContent {
+		return fmt.Errorf("webhook returned %d", resp.StatusCode)
+	}
+	return nil
+}