Added script that checks registered ports

CONTRIBUTING.md

@@ -63,13 +63,12 @@ In section *blockbook* update information how to build and configure Blockbook s
 
 Update *package_maintainer* and *package_maintainer_email* options in section *meta*.
 
+Execute script *contrib/scripts/check-ports.go* that will check mandatory ports and uniquity of registered ports.
+
 Execute script *contrib/scripts/generate-port-registry.go* that will update *docs/ports.md*.
 
 Now you can try generate package definitions as described above in order to check outputs.
 
-TODO:
-* script that checks unique port numbers
-
 #### Add coin implementation
 
 #### Add tests

contrib/scripts/check-ports.go

@@ -0,0 +1,83 @@
+//usr/bin/go run $0 $@ ; exit
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+const configDir = "configs/coins"
+
+type Config struct {
+	Coin struct {
+		Name string `json:"name"`
+	}
+	Ports map[string]uint16 `json:"ports"`
+}
+
+func main() {
+	ports := make(map[uint16][]string)
+	status := 0
+
+	files, err := ioutil.ReadDir(configDir)
+	if err != nil {
+		panic(err)
+	}
+
+	for _, fi := range files {
+		if fi.IsDir() || fi.Name()[0] == '.' {
+			continue
+		}
+
+		path := filepath.Join(configDir, fi.Name())
+		f, err := os.Open(path)
+		if err != nil {
+			panic(fmt.Errorf("%s: %s", path, err))
+		}
+		defer f.Close()
+
+		v := Config{}
+		d := json.NewDecoder(f)
+		err = d.Decode(&v)
+		if err != nil {
+			panic(fmt.Errorf("%s: json: %s", path, err))
+		}
+
+		if _, ok := v.Ports["blockbook_internal"]; !ok {
+			fmt.Printf("%s: missing blockbook_internal port\n", v.Coin.Name)
+			status = 1
+		}
+		if _, ok := v.Ports["blockbook_public"]; !ok {
+			fmt.Printf("%s: missing blockbook_public port\n", v.Coin.Name)
+			status = 1
+		}
+		if _, ok := v.Ports["backend_rpc"]; !ok {
+			fmt.Printf("%s: missing backend_rpc port\n", v.Coin.Name)
+			status = 1
+		}
+
+		for _, port := range v.Ports {
+			if port > 0 {
+				ports[port] = append(ports[port], v.Coin.Name)
+			}
+		}
+	}
+
+	for port, coins := range ports {
+		if len(coins) > 1 {
+			fmt.Printf("port %d: registered by %q\n", port, coins)
+			status = 1
+		}
+	}
+
+	if status == 0 {
+		fmt.Println("OK")
+	} else {
+		fmt.Println("Got some errors")
+	}
+
+	os.Exit(status)
+}