fix(rln_keystore_generator): improve error handling for unrecoverable failure

tests/waku_rln_relay/test_rln_group_manager_onchain.nim

@@ -197,6 +197,8 @@ proc setup(): Future[OnchainGroupManager] {.async.} =
     chainId: CHAIN_ID,
     ethPrivateKey: pk,
     rlnInstance: rlnInstance,
+    onFatalErrorAction: proc (errStr: string) =
+      raiseAssert errStr
   )
 
   return manager
@@ -256,6 +258,8 @@ suite "Onchain group manager":
       ethClientUrl: EthClient,
       ethContractAddress: $differentContractAddress,
       rlnInstance: manager.rlnInstance,
+      onFatalErrorAction: proc (errStr: string) =
+        raiseAssert errStr
     )
     (await manager2.init()).isErrOr:
       raiseAssert "Expected error when contract address doesn't match"

tools/rln_keystore_generator/rln_keystore_generator.nim

@@ -46,14 +46,22 @@ proc doRlnKeystoreGenerator*(conf: WakuNodeConf) =
     info "not executing, exiting"
     quit(0)
 
+  var onFatalErrorAction = proc(msg: string) {.gcsafe, closure.} =
+    ## Action to be taken when an internal error occurs during the node run.
+    ## e.g. the connection with the database is lost and not recovered.
+    error "Unrecoverable error occurred", error = msg
+    quit(QuitFailure)
+
   # 4. initialize OnchainGroupManager
   let groupManager = OnchainGroupManager(
     ethClientUrl: string(conf.rlnRelayethClientAddress),
+    chainId: conf.rlnRelayChainId,
     ethContractAddress: conf.rlnRelayEthContractAddress,
     rlnInstance: rlnInstance,
     keystorePath: none(string),
     keystorePassword: none(string),
     ethPrivateKey: some(conf.rlnRelayEthPrivateKey),
+    onFatalErrorAction: onFatalErrorAction
   )
   try:
     (waitFor groupManager.init()).isOkOr:

waku/waku_rln_relay/group_manager/on_chain/group_manager.nim

@@ -612,7 +612,7 @@ method init*(g: OnchainGroupManager): Future[GroupManagerResult[void]] {.async.}
     g.validRoots = metadata.validRoots.toDeque()
 
   var deployedBlockNumber: Uint256
-  g.retryWrapper(deployedBlockNumber, "Failed to get the deployed block number"):
+  g.retryWrapper(deployedBlockNumber, "Failed to get the deployed block number. Have you set the correct contract address?"):
     await wakuRlnContract.deployedBlockNumber().call()
   debug "using rln contract", deployedBlockNumber, rlnContractAddress = contractAddress
   g.rlnContractDeployedBlockNumber = cast[BlockNumber](deployedBlockNumber)

waku/waku_rln_relay/group_manager/on_chain/retry_wrapper.nim

@@ -17,6 +17,8 @@ template retryWrapper*(
     errCallback: OnFatalErrorHandler,
     body: untyped,
 ): auto =
+  if errCallback == nil:
+    raise newException(CatchableError, "Ensure that the errCallback is set")
   var retryCount = retryStrategy.retryCount
   var shouldRetry = retryStrategy.shouldRetry
   var exceptionMessage = ""