stacks-puppet-node/docs/event-dispatcher.md

Event dispatching / observer interface

The stacks-node supports a configurable event observer interface. This is enabled by adding an entry to the node's config.toml file:

...
[[events_observer]]
endpoint = "listener:3700"
events_keys = [
  "*"
]
...

The stacks-node will then execute HTTP POSTs to the configured endpoint in two events:

1. A new Stacks block is processed.
2. New mempool transactions have been received.

These events are sent to the configured endpoint at two URLs:

POST /new_block

This payload includes data related to a newly processed block, and any events emitted from Stacks transactions during the block.

Example:

{
  "block_hash": "0x4eaabcd105865e471f697eff5dd5bd85d47ecb5a26a3379d74fae0ae87c40904",
  "block_height": 3,
  "burn_block_time": 1591301733,
  "events": [
    {
      "event_index": 1,
      "committed": true,
      "stx_transfer_event": {
        "amount": "1000",
        "recipient": "ST31DA6FTSJX2WGTZ69SFY11BH51NZMB0ZZ239N96",
        "sender": "ST3WM51TCWMJYGZS1QFMC28DH5YP86782YGR113C1"
      },
      "txid": "0x738e4d44636023efa08374033428e44eca490582bd39a6e61f3b6cf749b4214c",
      "type": "stx_transfer_event"
    }
  ],
  "index_block_hash": "0x329efcbcc6daf5ac3f264522e0df50eddb5be85df6ee8a9fc2384c54274d7afc",
  "parent_block_hash": "0xf5d4ce0efe1d42c963d615ce57f0d014f263a985175e4ece766eceff10e0a358",
  "parent_index_block_hash": "0x0c8b38d44d6af72703a4767ff4cea683ec965346d9e9a7ded2d773fb4f257c28",
  "parent_microblock": "0xedd15cf1e697c28df934e259f0f82970a7c9edc2d39bef04bdd0d422116235c6",
  "transactions": [
    {
      "contract_abi": null,
      "raw_result": "0x03",
      "raw_tx": "0x808000000004008bc5147525b8f477f0bc4522a88c8339b2494db50000000000000002000000000000000001015814daf929d8700af344987681f44e913890a12e38550abe8e40f149ef5269f40f4008083a0f2e0ddf65dcd05ecfc151c7ff8a5308ad04c77c0e87b5aeadad31010200000000040000000000000000000000000000000000000000000000000000000000000000",
      "status": "success",
      "tx_index": 0,
      "txid": "0x3e04ada5426332bfef446ba0a06d124aace4ade5c11840f541bf88e2e919faf6"
    },
    {
      "contract_abi": null,
      "raw_result": "0x03",
      "raw_tx": "0x80800000000400f942874ce525e87f21bbe8c121b12fac831d02f4000000000000000000000000000003e800006ae29867aec4b0e4f776bebdcea7f6d9a24eeff370c8c739defadfcbb52659b30736ad4af021e8fb741520a6c65da419fdec01989fdf0032fc1838f427a9a36102010000000000051ac2d519faccba2e435f3272ff042b89435fd160ff00000000000003e800000000000000000000000000000000000000000000000000000000000000000000",
      "status": "success",
      "tx_index": 1,
      "txid": "0x738e4d44636023efa08374033428e44eca490582bd39a6e61f3b6cf749b4214c"
    }
   ],
   "matured_miner_rewards": [
    {
      "recipient": "ST31DA6FTSJX2WGTZ69SFY11BH51NZMB0ZZ239N96",
      "coinbase_amount": "1000",
      "tx_fees_anchored": "800",
      "tx_fees_streamed_confirmed": "0",
      "from_stacks_block_hash": "0xf5d4ce0efe1d42c963d615ce57f0d014f263a985175e4ece766eceff10e0a358",
      "from_index_block_hash": "0x329efcbcc6daf5ac3f264522e0df50eddb5be85df6ee8a9fc2384c54274d7afc",
    }
   ]
}

POST /new_burn_block

This payload includes information about burn blocks as their sortitions are processed. In the event of PoX forks, a new_burn_block event may be triggered for a burn block previously processed.

Example:

{
  "burn_block_hash": "0x4eaabcd105865e471f697eff5dd5bd85d47ecb5a26a3379d74fae0ae87c40904",
  "burn_block_height": 331,
  "reward_recipients": [
    {
      "recipient": "1C56LYirKa3PFXFsvhSESgDy2acEHVAEt6",
      "amount": 5000
    }
  ],
  "burn_amount": 12000
}

POST /new_mempool_tx

This payload includes raw transactions newly received in the node's mempool.

Example:

[
  "0x80800000000400f942874ce525e87f21bbe8c121b12fac831d02f4000000000000000000000000000003e800006ae29867aec4b0e4f776bebdcea7f6d9a24eeff370c8c739defadfcbb52659b30736ad4af021e8fb741520a6c65da419fdec01989fdf0032fc1838f427a9a36102010000000000051ac2d519faccba2e435f3272ff042b89435fd160ff00000000000003e800000000000000000000000000000000000000000000000000000000000000000000"
]