Add propatation_stats binary

cmd/propagation_stats/.gitignore

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+propagation_stats
+propagation.json

cmd/propagation_stats/README.md

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+# Propagation stats printer
+---
+
+`propagation_stats` takes propagation log as an input and prints stats to standard output.
+
+# Usage
+
+```
+./propagation_stats [-i ./propagation.json]
+```

cmd/propagation_stats/main.go

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+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"log"
+	"os"
+
+	"github.com/divan/graphx/formats"
+	"github.com/status-im/simulation/propagation"
+	"github.com/status-im/simulation/stats"
+)
+
+func main() {
+	var (
+		network  = flag.String("n", "network.json", "Input filename for network graph data")
+		plogFile = flag.String("p", "propagation.json", "Input filename for propagation log data")
+	)
+	flag.Parse()
+
+	data, err := formats.FromD3JSON(*network)
+	if err != nil {
+		log.Fatal("Opening network file failed: ", err)
+	}
+	log.Printf("Loaded network graph from %s file", *network)
+
+	fd, err := os.Open(*plogFile)
+	if err != nil {
+		log.Fatal("Opening propagation file failed: ", err)
+	}
+	defer fd.Close()
+	log.Printf("Loaded propagation log from %s file", *plogFile)
+
+	plog := &propagation.Log{}
+	err = json.NewDecoder(fd).Decode(&plog)
+	if err != nil {
+		log.Fatalf("Parsing propagation log failed: ", err)
+	}
+
+	ss := stats.Analyze(plog, len(data.Nodes()), len(data.Links()))
+	ss.PrintVerbose()
+}