package expvar
Import Path
expvar (on go.dev)
Dependency Relation
imports 12 packages, and imported by 0 packages
Involved Source Files
Package expvar 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. As of Go 1.22, the /debug/vars request must
use GET.
Operations to set or modify these public variables are atomic.
In addition to adding the HTTP handler, this package registers the
following variables:
cmdline os.Args
memstats runtime.Memstats
The package is sometimes only imported for the side effect of
registering its HTTP handler and the above variables. To use it
this way, link this package into your program:
import _ "expvar"
Package-Level Type Names (total 7)
Float is a 64-bit float variable that satisfies the [Var] interface.
Add adds delta to v.
Set sets v to value.
(*Float) String() string
(*Float) Value() float64
*Float : Var
*Float : fmt.Stringer
func NewFloat(name string) *Float
Func implements [Var] by calling the function
and formatting the returned value using JSON.
( Func) String() string
( Func) Value() any
Func : Var
Func : fmt.Stringer
Int is a 64-bit integer variable that satisfies the [Var] interface.
(*Int) Add(delta int64)
(*Int) Set(value int64)
(*Int) String() string
(*Int) Value() int64
*Int : Var
*Int : fmt.Stringer
func NewInt(name string) *Int
Map is a string-to-Var map variable that satisfies the [Var] interface.
Add adds delta to the *[Int] value stored under the given map key.
AddFloat adds delta to the *[Float] value stored under the given map key.
Delete deletes the given key from the map.
Do calls f for each entry in the map.
The map is locked during the iteration,
but existing entries may be concurrently updated.
(*Map) Get(key string) Var
Init removes all keys from the map.
(*Map) Set(key string, av Var)
(*Map) String() string
*Map : Var
*Map : fmt.Stringer
func NewMap(name string) *Map
func (*Map).Init() *Map
String is a string variable, and satisfies the [Var] interface.
(*String) Set(value string)
String implements the [Var] interface. To get the unquoted string
use [String.Value].
(*String) Value() string
*String : Var
*String : fmt.Stringer
func NewString(name string) *String
Var is an abstract type for all exported variables.
( Var) String() string
*Float
Func
*Int
*Map
*String
archive/tar.Format
*bytes.Buffer
crypto.Hash
crypto/tls.ClientAuthType
crypto/tls.CurveID
crypto/tls.QUICEncryptionLevel
crypto/tls.SignatureScheme
crypto/x509.OID
crypto/x509.PublicKeyAlgorithm
crypto/x509.SignatureAlgorithm
crypto/x509/pkix.Name
crypto/x509/pkix.RDNSequence
database/sql.IsolationLevel
*debug/dwarf.AddrType
*debug/dwarf.ArrayType
debug/dwarf.Attr
*debug/dwarf.BasicType
*debug/dwarf.BoolType
*debug/dwarf.CharType
debug/dwarf.Class
*debug/dwarf.ComplexType
*debug/dwarf.DotDotDotType
*debug/dwarf.EnumType
*debug/dwarf.FloatType
*debug/dwarf.FuncType
*debug/dwarf.IntType
*debug/dwarf.PtrType
*debug/dwarf.QualType
*debug/dwarf.StructType
debug/dwarf.Tag
debug/dwarf.Type (interface)
*debug/dwarf.TypedefType
*debug/dwarf.UcharType
*debug/dwarf.UintType
*debug/dwarf.UnspecifiedType
*debug/dwarf.UnsupportedType
*debug/dwarf.VoidType
debug/elf.Class
debug/elf.CompressionType
debug/elf.Data
debug/elf.DynFlag
debug/elf.DynFlag1
debug/elf.DynTag
debug/elf.Machine
debug/elf.NType
debug/elf.OSABI
debug/elf.ProgFlag
debug/elf.ProgType
debug/elf.R_386
debug/elf.R_390
debug/elf.R_AARCH64
debug/elf.R_ALPHA
debug/elf.R_ARM
debug/elf.R_LARCH
debug/elf.R_MIPS
debug/elf.R_PPC
debug/elf.R_PPC64
debug/elf.R_RISCV
debug/elf.R_SPARC
debug/elf.R_X86_64
debug/elf.SectionFlag
debug/elf.SectionIndex
debug/elf.SectionType
debug/elf.SymBind
debug/elf.SymType
debug/elf.SymVis
debug/elf.Type
debug/elf.Version
debug/macho.Cpu
debug/macho.LoadCmd
debug/macho.RelocTypeARM
debug/macho.RelocTypeARM64
debug/macho.RelocTypeGeneric
debug/macho.RelocTypeX86_64
debug/macho.Type
encoding/asn1.ObjectIdentifier
encoding/binary.AppendByteOrder (interface)
encoding/binary.ByteOrder (interface)
encoding/json.Delim
encoding/json.Number
flag.Getter (interface)
flag.Value (interface)
fmt.Stringer (interface)
go/ast.CommentMap
*go/ast.Ident
go/ast.ObjKind
*go/ast.Scope
*go/build/constraint.AndExpr
go/build/constraint.Expr (interface)
*go/build/constraint.NotExpr
*go/build/constraint.OrExpr
*go/build/constraint.TagExpr
go/constant.Kind
go/constant.Value (interface)
go/token.Position
go/token.Token
*go/types.Alias
*go/types.Array
*go/types.Basic
*go/types.Builtin
*go/types.Chan
*go/types.Const
*go/types.Func
*go/types.Initializer
*go/types.Interface
*go/types.Label
*go/types.Map
*go/types.MethodSet
*go/types.Named
*go/types.Nil
go/types.Object (interface)
*go/types.Package
*go/types.PkgName
*go/types.Pointer
*go/types.Scope
*go/types.Selection
*go/types.Signature
*go/types.Slice
*go/types.Struct
*go/types.Term
*go/types.Tuple
go/types.Type (interface)
*go/types.TypeName
*go/types.TypeParam
*go/types.Union
*go/types.Var
image.Point
image.Rectangle
image.YCbCrSubsampleRatio
internal/abi.Kind
*internal/buildcfg.ExperimentFlags
internal/buildcfg.Goarm64Features
internal/coverage.CounterGranularity
internal/coverage.CounterMode
*internal/godebug.Setting
*internal/pkgbits.Decoder
internal/pkgbits.SyncMarker
internal/platform.OSArch
*internal/profile.Graph
*internal/profile.Profile
internal/reflectlite.Type (interface)
internal/trace.Event
internal/trace.EventKind
internal/trace.GoState
internal/trace.ProcState
internal/trace.ResourceID
internal/trace.ResourceKind
internal/trace/event/go122.GoStatus
internal/trace/event/go122.ProcStatus
*internal/trace/internal/oldtrace.Event
*internal/trace/raw.Event
internal/types/errors.Code
io/fs.FileMode
log/slog.Attr
log/slog.Kind
log/slog.Level
*log/slog.LevelVar
log/slog.Value
*log/slog/internal/buffer.Buffer
math/big.Accuracy
*math/big.Float
*math/big.Int
*math/big.Rat
math/big.RoundingMode
net.Addr (interface)
net.Flags
net.HardwareAddr
net.IP
*net.IPAddr
net.IPMask
*net.IPNet
*net.TCPAddr
*net.UDPAddr
*net.UnixAddr
net/http.ConnState
*net/http.Cookie
net/http/cookiejar.PublicSuffixList (interface)
net/internal/socktest.Stat
net/internal/socktest.Status
*net/mail.Address
net/netip.Addr
net/netip.AddrPort
net/netip.Prefix
*net/url.URL
*net/url.Userinfo
*os.ProcessState
os.Signal (interface)
*os/exec.Cmd
os/exec.ExitError
reflect.ChanDir
reflect.Kind
reflect.Type (interface)
reflect.Value
*regexp.Regexp
regexp/syntax.ErrorCode
*regexp/syntax.Inst
regexp/syntax.InstOp
regexp/syntax.Op
*regexp/syntax.Prog
*regexp/syntax.Regexp
*runtime/debug.BuildInfo
*strings.Builder
syscall.Signal
testing.BenchmarkResult
text/scanner.Position
text/scanner.Scanner
*text/template/parse.ActionNode
*text/template/parse.BoolNode
*text/template/parse.BranchNode
*text/template/parse.BreakNode
*text/template/parse.ChainNode
*text/template/parse.CommandNode
*text/template/parse.CommentNode
*text/template/parse.ContinueNode
*text/template/parse.DotNode
*text/template/parse.FieldNode
*text/template/parse.IdentifierNode
*text/template/parse.IfNode
*text/template/parse.ListNode
*text/template/parse.NilNode
text/template/parse.Node (interface)
*text/template/parse.NumberNode
*text/template/parse.PipeNode
*text/template/parse.RangeNode
*text/template/parse.StringNode
*text/template/parse.TemplateNode
*text/template/parse.TextNode
*text/template/parse.VariableNode
*text/template/parse.WithNode
time.Duration
*time.Location
time.Month
time.Time
time.Weekday
vendor/golang.org/x/net/dns/dnsmessage.Class
vendor/golang.org/x/net/dns/dnsmessage.Name
vendor/golang.org/x/net/dns/dnsmessage.RCode
vendor/golang.org/x/net/dns/dnsmessage.Type
vendor/golang.org/x/net/http2/hpack.HeaderField
*vendor/golang.org/x/net/idna.Profile
*vendor/golang.org/x/text/unicode/bidi.Run
Var : fmt.Stringer
func Get(name string) Var
func (*Map).Get(key string) Var
func Publish(name string, v Var)
func (*Map).Set(key string, av Var)
Package-Level Functions (total 8)
Do calls f for each exported variable.
The global variable map is locked during the iteration,
but existing entries may be concurrently updated.
Get retrieves a named exported variable. It returns nil if the name has
not been registered.
Handler returns the expvar HTTP Handler.
This is only needed to install the handler in a non-standard location.
Publish declares a 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.Panic.
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