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expvar: add Func for functions that return values that are JSON marshalable.

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Remove {Float,Int,String}Func, which are now redundant.

Fixes #1684.

R=rsc, r, r2
CC=golang-dev
https://golang.org/cl/4410041
This commit is contained in:
David Symonds 2011-04-15 01:21:18 -07:00
parent 6ca71fb897
commit 57d0c26c01
2 changed files with 21 additions and 58 deletions
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37
src/pkg/expvar/expvar.go
View File

@ -180,23 +180,14 @@ func (v *String) String() string { return strconv.Quote(v.s) }
func (v *String) Set(value string) { v.s = value }
// IntFunc wraps a func() int64 to create a value that satisfies the Var interface.
// The function will be called each time the Var is evaluated.
type IntFunc func() int64
// Func implements Var by calling the function
// and formatting the returned value using JSON.
type Func func() interface{}
func (v IntFunc) String() string { return strconv.Itoa64(v()) }
// FloatFunc wraps a func() float64 to create a value that satisfies the Var interface.
// The function will be called each time the Var is evaluated.
type FloatFunc func() float64
func (v FloatFunc) String() string { return strconv.Ftoa64(v(), 'g', -1) }
// StringFunc wraps a func() string to create value that satisfies the Var interface.
// The function will be called each time the Var is evaluated.
type StringFunc func() string
func (f StringFunc) String() string { return strconv.Quote(f()) }
func (f Func) String() string {
v, _ := json.Marshal(f())
return string(v)
}
// All published variables.
@ -282,18 +273,16 @@ func expvarHandler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "\n}\n")
}
func memstats() string {
b, _ := json.MarshalIndent(&runtime.MemStats, "", "\t")
return string(b)
func cmdline() interface{} {
return os.Args
}
func cmdline() string {
b, _ := json.Marshal(os.Args)
return string(b)
func memstats() interface{} {
return runtime.MemStats
}
func init() {
http.Handle("/debug/vars", http.HandlerFunc(expvarHandler))
Publish("cmdline", StringFunc(cmdline))
Publish("memstats", StringFunc(memstats))
Publish("cmdline", Func(cmdline))
Publish("memstats", Func(memstats))
}

42
src/pkg/expvar/expvar_test.go
View File

@ -114,41 +114,15 @@ func TestMapCounter(t *testing.T) {
}
}
func TestIntFunc(t *testing.T) {
x := int64(4)
ix := IntFunc(func() int64 { return x })
if s := ix.String(); s != "4" {
t.Errorf("ix.String() = %v, want 4", s)
func TestFunc(t *testing.T) {
var x interface{} = []string{"a", "b"}
f := Func(func() interface{} { return x })
if s, exp := f.String(), `["a","b"]`; s != exp {
t.Errorf(`f.String() = %q, want %q`, s, exp)
}
x++
if s := ix.String(); s != "5" {
t.Errorf("ix.String() = %v, want 5", s)
}
}
func TestFloatFunc(t *testing.T) {
x := 8.5
ix := FloatFunc(func() float64 { return x })
if s := ix.String(); s != "8.5" {
t.Errorf("ix.String() = %v, want 3.14", s)
}
x -= 1.25
if s := ix.String(); s != "7.25" {
t.Errorf("ix.String() = %v, want 4.34", s)
}
}
func TestStringFunc(t *testing.T) {
x := "hello"
sx := StringFunc(func() string { return x })
if s, exp := sx.String(), `"hello"`; s != exp {
t.Errorf(`sx.String() = %q, want %q`, s, exp)
}
x = "goodbye"
if s, exp := sx.String(), `"goodbye"`; s != exp {
t.Errorf(`sx.String() = %q, want %q`, s, exp)
x = 17
if s, exp := f.String(), `17`; s != exp {
t.Errorf(`f.String() = %q, want %q`, s, exp)
}
}