go/extra/stats: add block singature counting tool

go/Makefile

@@ -10,7 +10,7 @@ all: build
 
 # Build.
 # List of Go binaries to build.
-go-binaries := oasis-node oasis-test-runner oasis-net-runner
+go-binaries := oasis-node oasis-test-runner oasis-net-runner extra/stats
 # List of test helpers to build.
 test-helpers := urkel
 # List of test vectors to generate.

go/extra/stats/.gitignore

@@ -0,0 +1 @@
+extra/stats

go/extra/stats/README.md

@@ -0,0 +1,19 @@
+## Stats
+
+Queries a node for networks stats. Currently implemented per entity block
+signature counts.
+
+## Usage
+
+```
+extra/stats entity-signatures \
+    --address unix:<node_dir>/internal.sock \
+    --start-block 0 \
+    --end-block 100 \
+    --top-n 100
+
+|Rank |Entity ID                                                       |Nodes |Signatures|
+------------------------------------------------------------------------------------------
+|1    |ef9ccfc825d5f0087e56937c697b46520f29f81e21d8a289218a4ebaef00509c|     6|       100|
+|2    |4ea5328f943ef6f66daaed74cb0e99c3b1c45f76307b425003dbc7cb3638ed35|     1|        80|
+...

go/extra/stats/cmd/root.go

@@ -0,0 +1,53 @@
+// Package cmd implements stats cmd tool.
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+	flag "github.com/spf13/pflag"
+	"github.com/spf13/viper"
+
+	"github.com/oasislabs/oasis-core/go/common/logging"
+	"github.com/oasislabs/oasis-core/go/common/version"
+	"github.com/oasislabs/oasis-core/go/oasis-node/cmd/common"
+)
+
+const cfgLogLevel = "log.level"
+
+var (
+	rootCmd = &cobra.Command{
+		Use:     "stats",
+		Short:   "Oasis stats",
+		Version: version.SoftwareVersion,
+	}
+
+	rootFlags = flag.NewFlagSet("", flag.ContinueOnError)
+)
+
+// RootCommand returns the root (top level) cobra.Command.
+func RootCommand() *cobra.Command {
+	return rootCmd
+}
+
+// Execute spawns the main entry point after handling the command line arguments.
+func Execute() {
+	var logLevel logging.Level
+	if err := logLevel.Set(viper.GetString(cfgLogLevel)); err != nil {
+		common.EarlyLogAndExit(fmt.Errorf("root: failed to set log level: %w", err))
+	}
+
+	if err := rootCmd.Execute(); err != nil {
+		common.EarlyLogAndExit(err)
+	}
+}
+
+func init() {
+	logLevel := logging.LevelInfo
+	rootFlags.Var(&logLevel, cfgLogLevel, "log level")
+	_ = viper.BindPFlags(rootFlags)
+	rootCmd.PersistentFlags().AddFlagSet(rootFlags)
+
+	// Register all of the sub-commands.
+	RegisterStatsCmd(rootCmd)
+}