golint monitor package. Supports #4098

monitor/service.go

@@ -18,6 +18,7 @@ import (
 
 const leaderWaitTimeout = 30 * time.Second
 
+// Policy constants.
 const (
 	MonitorRetentionPolicy         = "monitor"
 	MonitorRetentionPolicyDuration = 7 * 24 * time.Hour
@@ -50,6 +51,7 @@ type Diagnostic struct {
 	Rows    [][]interface{}
 }
 
+// NewDiagnostic initialises a new Diagnostic with the specified columns.
 func NewDiagnostic(columns []string) *Diagnostic {
 	return &Diagnostic{
 		Columns: columns,
@@ -57,6 +59,7 @@ func NewDiagnostic(columns []string) *Diagnostic {
 	}
 }
 
+// AddRow appends the provided row to the Diagnostic's rows.
 func (d *Diagnostic) AddRow(r []interface{}) {
 	d.Rows = append(d.Rows, r)
 }
@@ -172,7 +175,7 @@ func (m *Monitor) DeregisterDiagnosticsClient(name string) {
 // Statistics returns the combined statistics for all expvar data. The given
 // tags are added to each of the returned statistics.
 func (m *Monitor) Statistics(tags map[string]string) ([]*Statistic, error) {
-	statistics := make([]*Statistic, 0)
+	var statistics []*Statistic
 
 	expvar.Do(func(kv expvar.KeyValue) {
 		// Skip built-in expvar stats.
@@ -281,6 +284,9 @@ func (m *Monitor) Statistics(tags map[string]string) ([]*Statistic, error) {
 	return statistics, nil
 }
 
+// Diagnostics fetches diagnostic information for each registered
+// diagnostic client. It skips any clients that return an error when
+// retrieving their diagnostics.
 func (m *Monitor) Diagnostics() (map[string]*Diagnostic, error) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
@@ -412,7 +418,7 @@ func newStatistic(name string, tags map[string]string, values map[string]interfa
 // valueNames returns a sorted list of the value names, if any.
 func (s *Statistic) valueNames() []string {
 	a := make([]string, 0, len(s.Values))
-	for k, _ := range s.Values {
+	for k := range s.Values {
 		a = append(a, k)
 	}
 	sort.Strings(a)
@@ -423,7 +429,7 @@ func (s *Statistic) valueNames() []string {
 func DiagnosticFromMap(m map[string]interface{}) *Diagnostic {
 	// Display columns in deterministic order.
 	sortedKeys := make([]string, 0, len(m))
-	for k, _ := range m {
+	for k := range m {
 		sortedKeys = append(sortedKeys, k)
 	}
 	sort.Strings(sortedKeys)

monitor/statement_executor.go

@@ -33,8 +33,8 @@ func (s *StatementExecutor) executeShowStatistics(module string) *influxql.Resul
 	if err != nil {
 		return &influxql.Result{Err: err}
 	}
-	rows := make([]*models.Row, 0)
 
+	var rows []*models.Row
 	for _, stat := range stats {
 		if module != "" && stat.Name != module {
 			continue
@@ -61,7 +61,7 @@ func (s *StatementExecutor) executeShowDiagnostics(module string) *influxql.Resu
 
 	// Get a sorted list of diagnostics keys.
 	sortedKeys := make([]string, 0, len(diags))
-	for k, _ := range diags {
+	for k := range diags {
 		sortedKeys = append(sortedKeys, k)
 	}
 	sort.Strings(sortedKeys)