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package notify
import (
"bytes"
"encoding/json"
"fmt"
"log/slog"
"net/http"
"time"
)
// Notifier sends notifications when tasks complete.
type Notifier interface {
Notify(event Event) error
}
// Event represents a task completion event.
type Event struct {
TaskID string `json:"task_id"`
TaskName string `json:"task_name"`
Status string `json:"status"`
CostUSD float64 `json:"cost_usd"`
Duration string `json:"duration"`
Error string `json:"error,omitempty"`
}
// WebhookNotifier sends POST requests to a configured URL.
type WebhookNotifier struct {
URL string
client *http.Client
logger *slog.Logger
}
func NewWebhookNotifier(url string, logger *slog.Logger) *WebhookNotifier {
return &WebhookNotifier{
URL: url,
client: &http.Client{Timeout: 10 * time.Second},
logger: logger,
}
}
func (w *WebhookNotifier) Notify(event Event) error {
body, err := json.Marshal(event)
if err != nil {
return fmt.Errorf("marshaling event: %w", err)
}
resp, err := w.client.Post(w.URL, "application/json", bytes.NewReader(body))
if err != nil {
return fmt.Errorf("sending webhook: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode >= 400 {
return fmt.Errorf("webhook returned %d", resp.StatusCode)
}
return nil
}
// MultiNotifier fans out to multiple notifiers.
type MultiNotifier struct {
notifiers []Notifier
logger *slog.Logger
}
func NewMultiNotifier(logger *slog.Logger, notifiers ...Notifier) *MultiNotifier {
return &MultiNotifier{notifiers: notifiers, logger: logger}
}
func (m *MultiNotifier) Notify(event Event) error {
var lastErr error
for _, n := range m.notifiers {
if err := n.Notify(event); err != nil {
m.logger.Error("notification failed", "error", err)
lastErr = err
}
}
return lastErr
}
// LogNotifier logs events (useful as a default/fallback).
type LogNotifier struct {
Logger *slog.Logger
}
func (l *LogNotifier) Notify(event Event) error {
l.Logger.Info("task completed",
"task_id", event.TaskID,
"task_name", event.TaskName,
"status", event.Status,
"cost_usd", event.CostUSD,
"duration", event.Duration,
)
return nil
}
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