Get ghz compliant with errcheck

Makefile

@@ -100,7 +100,7 @@ staticcheck:
 # Lint runs all linters. This is the main lint target to run.
 # TODO: add errcheck and staticcheck when the code is updated to pass them
 .PHONY: lint
-lint: golint
+lint: golint errcheck
 
 # Test runs go test on GO_PKGS. This does not produce code coverage.
 .PHONY: test

cmd/ghz-web/main.go

@@ -52,14 +52,16 @@ func main() {
 
 	conf, err := config.Read(cfgPath)
 	if err != nil {
-		panic(err)
+		handleError(err)
 	}
 
 	db, err := database.New(conf.Database.Type, conf.Database.Connection, conf.Log.Level == "debug")
 	if err != nil {
-		panic(err)
+		handleError(err)
 	}
-	defer db.Close()
+	defer func() {
+		handleError(db.Close())
+	}()
 
 	info := &api.ApplicationInfo{
 		Version:   version,
@@ -70,11 +72,20 @@ func main() {
 
 	server, err := router.New(db, info, conf)
 	if err != nil {
-		panic(err)
+		handleError(err)
 	}
 
 	router.PrintRoutes(server)
 
 	hostPort := net.JoinHostPort("", strconv.FormatUint(uint64(conf.Server.Port), 10))
 	server.Logger.Fatal(server.Start(hostPort))
 }
+
+func handleError(err error) {
+	if err != nil {
+		if errString := err.Error(); errString != "" {
+			fmt.Fprintln(os.Stderr, errString)
+		}
+		os.Exit(1)
+	}
+}

cmd/ghz/main.go

@@ -147,7 +147,7 @@ func main() {
 		var conf config
 		err := configor.Load(&conf, cfgPath)
 		if err != nil {
-			errAndExit(err.Error())
+			handleError(err)
 		}
 
 		cfg = &conf
@@ -159,7 +159,7 @@ func main() {
 		var err error
 		cfg, err = createConfigFromArgs()
 		if err != nil {
-			errAndExit(err.Error())
+			handleError(err)
 		}
 	}
 
@@ -220,31 +220,37 @@ func main() {
 
 	report, err := runner.Run(cfg.Call, cfg.Host, options...)
 	if err != nil {
-		errAndExit(err.Error())
+		handleError(err)
 	}
 
 	output := os.Stdout
 	outputPath := strings.TrimSpace(cfg.Output)
 	if outputPath != "" {
 		f, err := os.Create(outputPath)
 		if err != nil {
-			errAndExit(err.Error())
+			handleError(err)
 		}
-		defer f.Close()
+		defer func() {
+			handleError(f.Close())
+		}()
 		output = f
 	}
 
 	p := printer.ReportPrinter{
 		Report: report,
-		Out:    output}
+		Out:    output,
+	}
 
-	p.Print(cfg.Format)
+	handleError(p.Print(cfg.Format))
 }
 
-func errAndExit(msg string) {
-	fmt.Fprintf(os.Stderr, msg)
-	fmt.Fprintf(os.Stderr, "\n")
-	os.Exit(1)
+func handleError(err error) {
+	if err != nil {
+		if errString := err.Error(); errString != "" {
+			fmt.Fprintln(os.Stderr, errString)
+		}
+		os.Exit(1)
+	}
 }
 
 func usageAndExit(msg string) {

go.mod

@@ -33,6 +33,8 @@ require (
 	github.com/stretchr/testify v1.3.0
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4 // indirect
+	go.uber.org/atomic v1.3.2 // indirect
+	go.uber.org/multierr v1.1.0
 	golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc // indirect
 	golang.org/x/net v0.0.0-20190110200230-915654e7eabc
 	google.golang.org/grpc v1.17.0

go.sum

@@ -75,6 +75,10 @@ github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6Kllzaw
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4 h1:gKMu1Bf6QINDnvyZuTaACm9ofY+PRh+5vFz4oxBZeF8=
 github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4/go.mod h1:50wTf68f99/Zt14pr046Tgt3Lp2vLyFZKzbFXTOabXw=
+go.uber.org/atomic v1.3.2 h1:2Oa65PReHzfn29GpvgsYwloV9AVFHPDk8tYxt2c2tr4=
+go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
+go.uber.org/multierr v1.1.0 h1:HoEmRHQPVSqub6w2z2d2EOVs2fjyFRGyofhKuyDq0QI=
+go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
 golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc h1:F5tKCVGp+MUAHhKp5MZtGqAlGX3+oCsiL1Q629FL90M=
 golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3 h1:x/bBzNauLQAlE3fLku/xy92Y8QwKX5HZymrMz2IiKFc=

internal/common.go

@@ -11,13 +11,15 @@ import (
 	"github.com/bojand/ghz/internal/helloworld"
 )
 
-// TestPort is the port
+// TestPort is the port.
 var TestPort string
 
-// TestLocalhost is the localhost
+// TestLocalhost is the localhost.
 var TestLocalhost string
 
-// StartServer starts server
+// StartServer starts the server.
+//
+// For testing only.
 func StartServer(secure bool) (*helloworld.Greeter, *grpc.Server, error) {
 	lis, err := net.Listen("tcp", ":0")
 	if err != nil {
@@ -44,7 +46,7 @@ func StartServer(secure bool) (*helloworld.Greeter, *grpc.Server, error) {
 	TestLocalhost = "localhost:" + TestPort
 
 	go func() {
-		s.Serve(lis)
+		_ = s.Serve(lis)
 	}()
 
 	return gs, s, err