Update version.

This update handles the situation where an ETH2 client does not provide
all required interfaces for the 'chain status' command, returning an
error rather than simply panicing.

Fixes #35.

CHANGELOG.md

@@ -1,3 +1,8 @@
+1.9.1
+  - Avoid crash when required interfaces for chain status command are not supported
+  - Avoid crash with latest version of herumi/go-bls
+
+
 1.9.0
   - allow use of Ethereum 1 address as withdrawal credentials
 

cmd/chainstatus.go

@@ -40,13 +40,19 @@ In quiet mode this will return 0 if the chain status can be obtained, otherwise
 		eth2Client, err := util.ConnectToBeaconNode(ctx, viper.GetString("connection"), viper.GetDuration("timeout"), viper.GetBool("allow-insecure-connections"))
 		errCheck(err, "Failed to connect to Ethereum 2 beacon node")
 
-		config, err := eth2Client.(eth2client.SpecProvider).Spec(ctx)
+		specProvider, isProvider := eth2Client.(eth2client.SpecProvider)
+		assert(isProvider, "beacon node does not provide spec; cannot report on chain status")
+		config, err := specProvider.Spec(ctx)
 		errCheck(err, "Failed to obtain beacon chain specification")
 
-		finality, err := eth2Client.(eth2client.FinalityProvider).Finality(ctx, "head")
+		finalityProvider, isProvider := eth2Client.(eth2client.FinalityProvider)
+		assert(isProvider, "beacon node does not provide finality; cannot report on chain status")
+		finality, err := finalityProvider.Finality(ctx, "head")
 		errCheck(err, "Failed to obtain finality information")
 
-		genesis, err := eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
+		genesisProvider, isProvider := eth2Client.(eth2client.GenesisProvider)
+		assert(isProvider, "beacon node does not provide genesis; cannot report on chain status")
+		genesis, err := genesisProvider.Genesis(ctx)
 		errCheck(err, "Failed to obtain genesis information")
 
 		slotDuration := config["SECONDS_PER_SLOT"].(time.Duration)

cmd/exitverify.go

@@ -70,7 +70,9 @@ In quiet mode this will return 0 if the the exit is verified correctly, otherwis
 		}
 		exitRoot, err := exit.HashTreeRoot()
 		errCheck(err, "Failed to obtain exit hash tree root")
-		sig, err := e2types.BLSSignatureFromBytes(data.Exit.Signature[:])
+		signatureBytes := make([]byte, 96)
+		copy(signatureBytes, data.Exit.Signature[:])
+		sig, err := e2types.BLSSignatureFromBytes(signatureBytes)
 		errCheck(err, "Invalid signature")
 		verified, err := util.VerifyRoot(account, exitRoot, exitDomain, sig)
 		errCheck(err, "Failed to verify voluntary exit")

cmd/version.go

@@ -24,7 +24,7 @@ import (
 
 // ReleaseVersion is the release version of the codebase.
 // Usually overridden by tag names when building binaries.
-var ReleaseVersion = "local build (latest release 1.9.0)"
+var ReleaseVersion = "local build (latest release 1.9.1)"
 
 // versionCmd represents the version command
 var versionCmd = &cobra.Command{