feat: harden sessions and track downstream acknowledgements

api/src/send-chain/gateway-events.controller.ts

@@ -4,6 +4,9 @@ import {
   GatewayInboundAuthDto,
   GatewayInboundSubmitDto,
   GatewayPendingDeliveryQueryDto,
+  GatewayDownstreamAcknowledgedDto,
+  GatewayDownstreamFailureType,
+  GatewayDownstreamSentDto,
   GatewayDownstreamRecoveryStatusDto,
   GatewayReceiptEventDto,
   GatewaySubmitDeadLetterDto,
@@ -66,9 +69,19 @@ export class GatewayEventsController {
     return this.sendChain.markDownstreamDeliveryDelivered(body.id);
   }
 
+  @Post('downstream/sent')
+  downstreamSent(@Body() body: GatewayDownstreamSentDto) {
+    return this.sendChain.markDownstreamDeliverySent(body);
+  }
+
+  @Post('downstream/acknowledged')
+  downstreamAcknowledged(@Body() body: GatewayDownstreamAcknowledgedDto) {
+    return this.sendChain.acknowledgeDownstreamDelivery(body);
+  }
+
   @Post('downstream/failed')
-  downstreamFailed(@Body() body: { id: string; errorMessage?: string }) {
-    return this.sendChain.markDownstreamDeliveryFailed(body.id, body.errorMessage);
+  downstreamFailed(@Body() body: { id: string; errorMessage?: string; failureType?: GatewayDownstreamFailureType }) {
+    return this.sendChain.markDownstreamDeliveryFailed(body.id, body.errorMessage, body.failureType);
   }
 
   @Post('downstream/recovery-status')