Simple RPC for modifying the Graffiti bytes

CHANGELOG.md

@@ -1,6 +1,10 @@
 TBD
 ==================
 
+**New features:**
+
+* Added the `setGraffiti` RPC (POST /api/nimbus/v1/graffiti in the REST API)
+
 **Breaking changes:**
 
 * Renamed some semi-internal debug rpc to be more explicit about their nature:

beacon_chain/rpc/nimbus_api.nim

@@ -87,6 +87,10 @@ proc installNimbusApiHandlers*(rpcServer: RpcServer, node: BeaconNode) {.
       updateLogLevel(level)
     return true
 
+  rpcServer.rpc("setGraffiti") do (graffiti: string) -> bool:
+    node.graffitiBytes = GraffitiBytes.init(graffiti)
+    return true
+
   rpcServer.rpc("getEth1Chain") do () -> seq[Eth1Block]:
     result = if node.eth1Monitor != nil:
       mapIt(node.eth1Monitor.blocks, it)
@@ -154,7 +158,6 @@ proc installNimbusApiHandlers*(rpcServer: RpcServer, node: BeaconNode) {.
       for peer in v:
         peers.add(peer.toNode(backOff.getOrDefault(peer.peerId)))
 
-
       gossipsub.add(topic, peers)
 
     res.add("gossipsub", gossipsub)

docs/the_nimbus_book/src/api.md

@@ -333,6 +333,15 @@ Set the current logging level dynamically: TRACE, DEBUG, INFO, NOTICE, WARN, ERR
 curl -d '{"jsonrpc":"2.0","id":"id","method":"setLogLevel","params":["DEBUG; TRACE:discv5,libp2p; REQUIRED:none; DISABLED:none"] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
 ```
 
+### setGraffiti
+
+Set the graffiti bytes that will be included in proposed blocks. The graffiti bytes can be
+specified as an UTF-8 encoded string or as an 0x-prefixed hex string specifying raw bytes.
+
+```
+curl -d '{"jsonrpc":"2.0","id":"id","method":"setGraffiti","params":["Mr F was here"] }' -H 'Content-Type: application/json' localhost:9190 -s | jq
+```
+
 ### getEth1Chain
 
 Get the list of Eth1 blocks that the beacon node is currently storing in memory.