first commit of restructured project

trahn-trade-backend/internal/notifications/webhook.go

@@ -0,0 +1,86 @@
+package notifications
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/kjannette/trahn-backend/internal/httputil"
+)
+
+type Sender struct {
+	webhookURL string
+	botName    string
+	httpClient *http.Client
+	retry      httputil.RetryConfig
+}
+
+func NewSender(webhookURL, botName string) *Sender {
+	if botName == "" {
+		botName = "TrahnGridTrader"
+	}
+	return &Sender{
+		webhookURL: webhookURL,
+		botName:    botName,
+		httpClient: &http.Client{Timeout: 10 * time.Second},
+		retry: httputil.RetryConfig{
+			MaxAttempts: 3,
+			BaseDelay:   1 * time.Second,
+			MaxDelay:    5 * time.Second,
+		},
+	}
+}
+
+func (s *Sender) Send(msg string) {
+	formatted := fmt.Sprintf("[%s] %s", s.botName, msg)
+	fmt.Printf("[%s] %s\n", time.Now().UTC().Format(time.RFC3339), formatted)
+
+	if s.webhookURL == "" {
+		return
+	}
+
+	payload := s.formatPayload(formatted)
+	body, err := json.Marshal(payload)
+	if err != nil {
+		fmt.Printf("[CHAT ERROR] marshal: %v\n", err)
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	resp, err := httputil.Do(ctx, s.httpClient, s.retry, func() (*http.Request, error) {
+		req, err := http.NewRequestWithContext(ctx, http.MethodPost, s.webhookURL, bytes.NewReader(body))
+		if err != nil {
+			return nil, err
+		}
+		req.Header.Set("Content-Type", "application/json")
+		return req, nil
+	})
+	if err != nil {
+		fmt.Printf("[CHAT ERROR] Failed to send notification after retries: %v\n", err)
+		return
+	}
+	resp.Body.Close()
+}
+
+func (s *Sender) formatPayload(msg string) map[string]string {
+	if strings.Contains(s.webhookURL, "discord") {
+		return map[string]string{
+			"content":  msg,
+			"username": s.botName,
+		}
+	}
+	return map[string]string{
+		"text":     fmt.Sprintf("`%s`", msg),
+		"username": s.botName,
+	}
+}
+
+func (s *Sender) Enabled() bool {
+	return s.webhookURL != ""
+}