| Sender { |
| n1: circle label:"Start" |
| n2: rectangle label:"Event occurs in system" |
| n3: rectangle label:"Build webhook payload" |
| n4: rectangle label:"Log delivery result" |
| n5: circle label:"End" |
| n1.handle(right) -> n2.handle(left) |
| n2.handle(right) -> n3.handle(left) |
| n3.handle(bottom) -> Delivery.n6.handle(top) [label="Send"] |
| n4.handle(right) -> n5.handle(left) |
| } |
| Delivery { |
| n6: rectangle label:"Sign payload with HMAC" |
| n7: rectangle label:"POST to subscriber URL" |
| n8: diamond label:"Response status?" |
| n9: rectangle label:"Mark as delivered" |
| n10: rectangle label:"Schedule retry" |
| n11: diamond label:"Max retries reached?" |
| n12: rectangle label:"Mark as failed" |
| n6.handle(right) -> n7.handle(left) |
| n7.handle(right) -> n8.handle(left) |
| n8.handle(right) -> n9.handle(left) [label="2xx"] |
| n8.handle(bottom) -> n10.handle(top) [label="4xx/5xx"] |
| n9.handle(top) -> Sender.n4.handle(bottom) [label="Success"] |
| n10.handle(right) -> n11.handle(left) |
| n11.handle(right) -> n12.handle(left) [label="Yes"] |
| n11.handle(bottom) -> n7.handle(bottom) [label="No"] |
| n12.handle(top) -> Sender.n4.handle(bottom) [label="Failed"] |
| loop [retry up to 5 times] n7 n8 n10 n11 |
| } |
| Receiver { |
| n13: rectangle label:"Receive POST request" |
| n14: rectangle label:"Verify HMAC signature" |
| n15: diamond label:"Signature valid?" |
| n16: rectangle label:"Parse JSON payload" |
| n17: rectangle label:"Return 401 Unauthorized" |
| n18: rectangle label:"Process event" |
| n19: rectangle label:"Return 200 OK" |
| n13.handle(right) -> n14.handle(left) |
| n14.handle(right) -> n15.handle(left) |
| n15.handle(right) -> n16.handle(left) [label="Yes"] |
| n15.handle(bottom) -> n17.handle(top) [label="No"] |
| n16.handle(right) -> n18.handle(left) |
| n17.handle(top) -> Sender.n4.handle(bottom) [label="Rejected"] |
| n18.handle(right) -> n19.handle(left) |
| n19.handle(top) -> Sender.n4.handle(bottom) [label="Processed"] |
| } |
|
|
