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112 lines
2.2 KiB
Markdown
112 lines
2.2 KiB
Markdown
# Websocket API
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**Note: the WebSocket server _only_ emits events. It does not accept any
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requests. Use the [HTTP API](./http.md) for requests.**
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By default, a Lighthouse `beacon_node` exposes a websocket server on `localhost:5053`.
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The following CLI flags control the websocket server:
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- `--no-ws`: disable the websocket server.
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- `--ws-port`: specify the listen port of the server.
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- `--ws-address`: specify the listen address of the server.
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All clients connected to the websocket server will receive the same stream of events, all triggered
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by the `BeaconChain`. Each event is a JSON object with the following schema:
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```json
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{
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"event": "string",
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"data": "object"
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}
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```
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## Events
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The following events may be emitted:
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### Beacon Head Changed
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Occurs whenever the canonical head of the beacon chain changes.
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```json
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{
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"event": "beacon_head_changed",
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"data": {
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"reorg": "boolean",
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"current_head_beacon_block_root": "string",
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"previous_head_beacon_block_root": "string"
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}
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}
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```
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### Beacon Finalization
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Occurs whenever the finalized checkpoint of the canonical head changes.
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```json
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{
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"event": "beacon_finalization",
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"data": {
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"epoch": "number",
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"root": "string"
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}
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}
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```
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### Beacon Block Imported
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Occurs whenever the beacon node imports a valid block.
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```json
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{
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"event": "beacon_block_imported",
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"data": {
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"block": "object"
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}
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}
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```
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### Beacon Block Rejected
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Occurs whenever the beacon node rejects a block because it is invalid or an
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error occurred during validation.
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```json
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{
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"event": "beacon_block_rejected",
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"data": {
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"reason": "string",
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"block": "object"
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}
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}
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```
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### Beacon Attestation Imported
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Occurs whenever the beacon node imports a valid attestation.
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```json
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{
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"event": "beacon_attestation_imported",
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"data": {
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"attestation": "object"
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}
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}
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```
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### Beacon Attestation Rejected
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Occurs whenever the beacon node rejects an attestation because it is invalid or
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an error occurred during validation.
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```json
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{
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"event": "beacon_attestation_rejected",
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"data": {
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"reason": "string",
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"attestation": "object"
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}
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}
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```
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