Linting fixes.

internal/application/application.go

@@ -28,16 +28,18 @@ type Application struct {
 
 // NewApplication creates new application.
 func NewApplication(ctx context.Context, name string, config *Config, logger *logger.Logger) *Application {
-	a := &Application{
+	// Some variables are initialized in initialize() function.
+	// nolint:exhaustivestruct
+	app := &Application{
 		config:   config,
 		ctx:      ctx,
 		doneChan: make(chan struct{}),
 		logger:   logger,
 		name:     name,
 	}
-	a.initialize()
+	app.initialize()
 
-	return a
+	return app
 }
 
 // GetDoneChan returns a channel which should be used to block execution until

internal/application/config.go

@@ -11,5 +11,6 @@ type Config struct {
 	Endpoint string `yaml:"endpoint"`
 	// TimeBetweenRequests is a minimal amount of time which should pass
 	// between requests.
+	// nolint:tagliatelle
 	TimeBetweenRequests time.Duration `yaml:"time_between_requests"`
 }

internal/application/fetcher.go

@@ -10,6 +10,9 @@ func (a *Application) fetch() {
 	// Do not do anything if fetching is running.
 	// ToDo: maybe another approach?
 	a.fetchIsRunningMutex.RLock()
+	// This is an optimization to avoid excessive waiting when using Lock().
+	// Most of time application will wait between fetches.
+	// nolint:ifshort
 	isFetching := a.fetchIsRunning
 	a.fetchIsRunningMutex.RUnlock()
 

internal/application/parser.go

@@ -143,8 +143,8 @@ func (a *Application) getParametersForPrometheusMetric(line string) []string {
 		paramNameFinished, paramValueStarted, paramValueFinished bool
 	)
 
-	for _, r := range valuesString {
-		if paramValueFinished && string(r) == "," {
+	for _, runeChar := range valuesString {
+		if paramValueFinished && string(runeChar) == "," {
 			params = append(params, paramName+":"+paramValue)
 			paramName, paramValue = "", ""
 			paramNameFinished, paramValueStarted, paramValueFinished = false, false, false
@@ -156,8 +156,8 @@ func (a *Application) getParametersForPrometheusMetric(line string) []string {
 		// "deeply nested"? I think not. So:
 		// nolint:nestif
 		if !paramNameFinished {
-			if string(r) != "=" {
-				paramName += string(r)
+			if string(runeChar) != "=" {
+				paramName += string(runeChar)
 
 				continue
 			} else {
@@ -166,19 +166,19 @@ func (a *Application) getParametersForPrometheusMetric(line string) []string {
 				continue
 			}
 		} else {
-			if string(r) == "\"" && !paramValueStarted {
+			if string(runeChar) == "\"" && !paramValueStarted {
 				paramValueStarted = true
 
 				continue
 			}
 
-			if paramValueStarted && string(r) != "\"" {
-				paramValue += string(r)
+			if paramValueStarted && string(runeChar) != "\"" {
+				paramValue += string(runeChar)
 
 				continue
 			}
 
-			if paramValueStarted && string(r) == "\"" {
+			if paramValueStarted && string(runeChar) == "\"" {
 				paramValueFinished = true
 
 				continue