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src/features/foundation/notifications/server/delivery-engine.ts

@@ -0,0 +1,62 @@
+import type {
+  NotificationDispatchStatus,
+  NotificationProvider,
+  NotificationProviderSendInput,
+  NotificationProviderSendResult,
+} from '../types';
+
+export type NotificationDispatchExecutionInput = {
+  provider: NotificationProvider;
+  message: NotificationProviderSendInput;
+  retryCount: number;
+  maxRetryCount: number;
+};
+
+export type NotificationDispatchExecutionResult = {
+  status: NotificationDispatchStatus;
+  retryCount: number;
+  sentAt: Date | null;
+  providerResult: NotificationProviderSendResult | null;
+  errorMessage: string | null;
+  attemptedAt: Date;
+};
+
+function normalizeProviderError(error: unknown) {
+  if (error instanceof Error) {
+    return error.message.slice(0, 500);
+  }
+
+  return 'Unknown notification delivery error';
+}
+
+export async function executeNotificationDispatch(
+  input: NotificationDispatchExecutionInput,
+): Promise<NotificationDispatchExecutionResult> {
+  const attemptedAt = new Date();
+
+  try {
+    await input.provider.validate();
+    const providerResult = await input.provider.send(input.message);
+
+    return {
+      status: 'sent',
+      retryCount: input.retryCount + 1,
+      sentAt: attemptedAt,
+      providerResult,
+      errorMessage: null,
+      attemptedAt,
+    };
+  } catch (error) {
+    const retryCount = input.retryCount + 1;
+    const shouldRetry = retryCount < input.maxRetryCount;
+
+    return {
+      status: shouldRetry ? 'retry' : 'failed',
+      retryCount,
+      sentAt: null,
+      providerResult: null,
+      errorMessage: normalizeProviderError(error),
+      attemptedAt,
+    };
+  }
+}