Package expvar
import "expvar"
The expvar package provides a standardized interface to public variables, such as operation counters in servers. It exposes these variables via HTTP at /debug/vars in JSON format.
Package files
expvar.gofunc Iter
func Iter() <-chan KeyValue
func Publish
func Publish(name string, v Var)
Publish declares an named exported variable. This should be called from a package's init function when it creates its Vars. If the name is already registered then this will log.Crash.
func RemoveAll
func RemoveAll()
RemoveAll removes all exported variables. This is for tests; don't call this on a real server.
type Int
Int is a 64-bit integer variable, and satisfies the Var interface.
type Int struct {
// contains unexported fields
}
func NewInt
func NewInt(name string) *Int
func (*Int) Add
func (v *Int) Add(delta int64)
func (*Int) String
func (v *Int) String() string
type IntFunc
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 (IntFunc) String
func (v IntFunc) String() string
type KeyValue
KeyValue represents a single entry in a Map.
type KeyValue struct {
Key string
Value Var
}
type Map
Map is a string-to-Var map variable, and satisfies the Var interface.
type Map struct {
// contains unexported fields
}
func NewMap
func NewMap(name string) *Map
func (*Map) Add
func (v *Map) Add(key string, delta int64)
func (*Map) Get
func (v *Map) Get(key string) Var
func (*Map) Init
func (v *Map) Init() *Map
func (*Map) Iter
func (v *Map) Iter() <-chan KeyValue
func (*Map) Set
func (v *Map) Set(key string, av Var)
func (*Map) String
func (v *Map) String() string
type String
String is a string variable, and satisfies the Var interface.
type String struct {
// contains unexported fields
}
func NewString
func NewString(name string) *String
func (*String) Set
func (v *String) Set(value string)
func (*String) String
func (v *String) String() string
type Var
Var is an abstract type for all exported variables.
type Var interface {
String() string
}
func Get
func Get(name string) Var
Get retrieves a named exported variable.