Linting

expvars.go

@@ -8,30 +8,35 @@ import (
 	"github.com/antonholmquist/jason"
 )
 
-const ExpvarsUrl = "/debug/vars"
+// ExpvarsUrl is the default url for fetching expvar info.
+const ExpvarsURL = "/debug/vars"
 
-type Expvar *jason.Object
+// Expvar represents fetched expvar variable.
+type Expvar struct {
+	*jason.Object
+}
 
 // FetchExpvar fetches expvar by http for the given addr (host:port)
-func FetchExpvar(addr string) (*jason.Object, error) {
-	var e jason.Object
+func FetchExpvar(addr string) (*Expvar, error) {
+	e := &Expvar{&jason.Object{}}
 	resp, err := http.Get(addr)
 	if err != nil {
-		return &e, err
+		return e, err
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode == http.StatusNotFound {
-		return &e, errors.New("Vars not found. Did you import expvars?")
-	} else {
-		expvar, err := ParseExpvar(resp.Body)
-		e = *expvar
-		if err != nil {
-			return &e, err
-		}
+		return e, errors.New("Vars not found. Did you import expvars?")
 	}
-	return &e, nil
+
+	e, err = ParseExpvar(resp.Body)
+	if err != nil {
+		return e, err
+	}
+	return e, nil
 }
 
-func ParseExpvar(r io.Reader) (*jason.Object, error) {
-	return jason.NewObjectFromReader(r)
+// ParseExpvar parses expvar data from reader.
+func ParseExpvar(r io.Reader) (*Expvar, error) {
+	object, err := jason.NewObjectFromReader(r)
+	return &Expvar{object}, err
 }

main.go

@@ -38,7 +38,9 @@ func main() {
 	if *dummy {
 		ui = &DummyUI{}
 	}
-	ui.Init(*data)
+	if err := ui.Init(*data); err != nil {
+		log.Fatal(err)
+	}
 	defer ui.Close()
 
 	tick := time.NewTicker(*interval)

service.go

@@ -7,6 +7,7 @@ import (
 	//"github.com/pyk/byten"
 )
 
+// Services is just a slice of Service.
 type Services []*Service
 
 // Service represents constantly updating info about single service.
@@ -68,7 +69,7 @@ func (s *Service) updateCmdline(cmdline []string) {
 //
 // If host is not specified, 'localhost' is used.
 func (s Service) Addr() string {
-	return fmt.Sprintf("http://localhost:%s%s", s.Port, ExpvarsUrl)
+	return fmt.Sprintf("http://localhost:%s%s", s.Port, ExpvarsURL)
 }
 
 // StatusLine returns status line for services with it's name and status.
@@ -80,6 +81,7 @@ func (s Service) StatusLine() string {
 	return fmt.Sprintf("[R] %s", s.Name)
 }
 
+// Value returns current value for the given var of this service.
 func (s Service) Value(name VarName) string {
 	if s.Err != nil {
 		return "N/A"
@@ -95,6 +97,8 @@ func (s Service) Value(name VarName) string {
 	return fmt.Sprintf("%d", val.Front())
 }
 
+// Values returns slice of ints with recent values of the given var,
+// to be used with sparkline.
 func (s Service) Values(name VarName) []int {
 	if s.Err != nil {
 		return nil

source.go

@@ -1,5 +0,0 @@
-package main
-
-type Source interface {
-	Update() (interface{}, error)
-}

ui_dummy.go

@@ -7,8 +7,13 @@ import (
 // DummyUI is an simple console UI mockup, for testing purposes.
 type DummyUI struct{}
 
+// Init implements UI.
 func (*DummyUI) Init(UIData) error { return nil }
-func (*DummyUI) Close()            {}
+
+// Close implements UI.
+func (*DummyUI) Close() {}
+
+// Update implements UI.
 func (*DummyUI) Update(data UIData) {
 	if data.Services == nil {
 		return

ui_termui.go

@@ -32,6 +32,7 @@ func (t *TermUI) Init(data UIData) error {
 		p.TextFgColor = termui.ColorWhite
 		p.Border.Label = "Services Monitor"
 		p.Border.FgColor = termui.ColorCyan
+		t.Title.Text = fmt.Sprintf("monitoring %d services, press q to quit", len(data.Services))
 		return p
 	}()
 	t.Status = func() *termui.Par {
@@ -99,8 +100,8 @@ func (t *TermUI) Init(data UIData) error {
 	return nil
 }
 
+// Update updates UI widgets from UIData.
 func (t *TermUI) Update(data UIData) {
-	t.Title.Text = fmt.Sprintf("monitoring %d services, press q to quit", len(data.Services))
 	t.Status.Text = fmt.Sprintf("Last update: %v", data.LastTimestamp.Format("15:04:05 02/Jan/06"))
 
 	var services []string