Renamed parameters

.gitignore

@@ -0,0 +1,3 @@
+.DS_Store
+.idea
+.vscode

.gitmodules

@@ -1,6 +0,0 @@
-[submodule "vendor/github.com/GaryBoone/GoStats"]
-	path = vendor/github.com/GaryBoone/GoStats
-	url = git://github.com/GaryBoone/GoStats
-[submodule "vendor/github.com/eclipse/paho.mqtt.golang"]
-	path = vendor/github.com/eclipse/paho.mqtt.golang
-	url = git://github.com/eclipse/paho.mqtt.golang

README.md

@@ -12,22 +12,36 @@ go get github.com/krylovsk/mqtt-benchmark
 The tool supports multiple concurrent clients, configurable message size, etc:
 
 ```sh
-> mqtt-benchmark --help
-Usage of mqtt-benchmark:
-  -broker="tcp://localhost:1883": MQTT broker endpoint as scheme://host:port
-  -cert="cert.pem": File path to your client certificate in PEM format
-  -client-id="mqtt-benchmark": MQTT client id
-  -clients=10: Number of clients to start
-  -count=100: Number of messages to send per client
-  -format="text": Output format: text|json
-  -key="key.pem": File path to your private key in PEM format
-  -password="": MQTT password (empty if auth disabled)
-  -qos=1: QoS for published messages
-  -quiet=false : Suppress logs while running (except errors and the result)
-  -size=100: Size of the messages payload (bytes)
-  -topic="/test": MQTT topic for incoming message
-  -username="": MQTT username (empty if auth disabled)
-  -wait="60000": QoS 1 wait timeout in milliseconds (default 60000)
+$ ./mqtt-benchmark -h
+Usage of ./mqtt-benchmark:
+  -broker string
+    	MQTT broker endpoint as scheme://host:port (default "tcp://localhost:1883")
+  -client-cert string
+    	Path to client certificate in PEM format
+  -client-key string
+    	Path to private clientKey in PEM format
+  -client-prefix string
+    	MQTT client id prefix (suffixed with '-<client-num>' (default "mqtt-benchmark")
+  -clients int
+    	Number of clients to start (default 10)
+  -count int
+    	Number of messages to send per client (default 100)
+  -format string
+    	Output format: text|json (default "text")
+  -password string
+    	MQTT client password (empty if auth disabled)
+  -qos int
+    	QoS for published messages (default 1)
+  -quiet
+    	Suppress logs while running
+  -size int
+    	Size of the messages payload (bytes) (default 100)
+  -topic string
+    	MQTT topic for outgoing messages (default "/test")
+  -username string
+    	MQTT client username (empty if auth disabled)
+  -wait int
+    	QoS 1 wait timeout in milliseconds (default 60000)
 ```
 
 > NOTE: if `count=1` or `clients=1`, the sample standard deviation will be returned as `0` (convention due to the [lack of NaN support in JSON](https://tools.ietf.org/html/rfc4627#section-2.4))

client.go

@@ -10,6 +10,7 @@ import (
 	mqtt "github.com/eclipse/paho.mqtt.golang"
 )
 
+// Client implements an MQTT client running benchmark test
 type Client struct {
 	ID          int
 	ClientID    string
@@ -22,9 +23,10 @@ type Client struct {
 	MsgQoS      byte
 	Quiet       bool
 	WaitTimeout time.Duration
-	TlsConfig   *tls.Config
+	TLSConfig   *tls.Config
 }
 
+// Run runs benchmark tests and writes results in the provided channel
 func (c *Client) Run(res chan *RunResults) {
 	newMsgs := make(chan *Message)
 	pubMsgs := make(chan *Message)
@@ -137,8 +139,8 @@ func (c *Client) pubMessages(in, out chan *Message, doneGen, donePub chan bool)
 		opts.SetUsername(c.BrokerUser)
 		opts.SetPassword(c.BrokerPass)
 	}
-	if c.TlsConfig != nil {
-		opts.SetTLSConfig(c.TlsConfig)
+	if c.TLSConfig != nil {
+		opts.SetTLSConfig(c.TLSConfig)
 	}
 
 	client := mqtt.NewClient(opts)

main.go

@@ -60,9 +60,8 @@ func main() {
 	var (
 		broker       = flag.String("broker", "tcp://localhost:1883", "MQTT broker endpoint as scheme://host:port")
 		topic        = flag.String("topic", "/test", "MQTT topic for outgoing messages")
-		clientID = flag.String("client-id", "mqtt-benchmark", "MQTT client id")
-		username = flag.String("username", "", "MQTT username (empty if auth disabled)")
-		password = flag.String("password", "", "MQTT password (empty if auth disabled)")
+		username     = flag.String("username", "", "MQTT client username (empty if auth disabled)")
+		password     = flag.String("password", "", "MQTT client password (empty if auth disabled)")
 		qos          = flag.Int("qos", 1, "QoS for published messages")
 		wait         = flag.Int("wait", 60000, "QoS 1 wait timeout in milliseconds")
 		size         = flag.Int("size", 100, "Size of the messages payload (bytes)")
@@ -70,8 +69,9 @@ func main() {
 		clients      = flag.Int("clients", 10, "Number of clients to start")
 		format       = flag.String("format", "text", "Output format: text|json")
 		quiet        = flag.Bool("quiet", false, "Suppress logs while running")
-		cert     = flag.String("cert", "", "File path to your client certificate in PEM format")
-		key      = flag.String("key", "", "File path to your private key in PEM format")
+		clientPrefix = flag.String("client-prefix", "mqtt-benchmark", "MQTT client id prefix (suffixed with '-<client-num>'")
+		clientCert   = flag.String("client-cert", "", "Path to client certificate in PEM format")
+		clientKey    = flag.String("client-key", "", "Path to private clientKey in PEM format")
 	)
 
 	flag.Parse()
@@ -83,17 +83,17 @@ func main() {
 		log.Fatalf("Invalid arguments: messages count should be > 1, given: %v", *count)
 	}
 
-	if *cert != "" && *key == "" {
-		log.Fatal("Invalid arguments: private key path missing")
+	if *clientCert != "" && *clientKey == "" {
+		log.Fatal("Invalid arguments: private clientKey path missing")
 	}
 
-	if *cert == "" && *key != "" {
+	if *clientCert == "" && *clientKey != "" {
 		log.Fatalf("Invalid arguments: certificate path missing")
 	}
 
 	var tlsConfig *tls.Config
-	if *cert != "" && *key != "" {
-		tlsConfig = generateTlsConfig(*cert, *key)
+	if *clientCert != "" && *clientKey != "" {
+		tlsConfig = generateTLSConfig(*clientCert, *clientKey)
 	}
 
 	resCh := make(chan *RunResults)
@@ -104,7 +104,7 @@ func main() {
 		}
 		c := &Client{
 			ID:          i,
-			ClientID:    *clientID,
+			ClientID:    *clientPrefix,
 			BrokerURL:   *broker,
 			BrokerUser:  *username,
 			BrokerPass:  *password,
@@ -114,7 +114,7 @@ func main() {
 			MsgQoS:      byte(*qos),
 			Quiet:       *quiet,
 			WaitTimeout: time.Duration(*wait) * time.Millisecond,
-			TlsConfig:   tlsConfig,
+			TLSConfig:   tlsConfig,
 		}
 		go c.Run(resCh)
 	}
@@ -183,7 +183,7 @@ func printResults(results []*RunResults, totals *TotalResults, format string) {
 			log.Fatalf("Error marshalling results: %v", err)
 		}
 		var out bytes.Buffer
-		json.Indent(&out, data, "", "\t")
+		_ = json.Indent(&out, data, "", "\t")
 
 		fmt.Println(string(out.Bytes()))
 	default:
@@ -211,7 +211,7 @@ func printResults(results []*RunResults, totals *TotalResults, format string) {
 	return
 }
 
-func generateTlsConfig(certFile string, keyFile string) *tls.Config {
+func generateTLSConfig(certFile string, keyFile string) *tls.Config {
 	cert, err := tls.LoadX509KeyPair(certFile, keyFile)
 	if err != nil {
 		log.Fatalf("Error reading certificate files: %v", err)