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191
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Apache License
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/*
Copyright 2013 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Package lru implements an LRU cache.
package lru
import "container/list"
// Cache is an LRU cache. It is not safe for concurrent access.
type Cache struct {
// MaxEntries is the maximum number of cache entries before
// an item is evicted. Zero means no limit.
MaxEntries int
// OnEvicted optionally specifies a callback function to be
// executed when an entry is purged from the cache.
OnEvicted func(key Key, value interface{})
ll *list.List
cache map[interface{}]*list.Element
}
// A Key may be any value that is comparable. See http://golang.org/ref/spec#Comparison_operators
type Key interface{}
type entry struct {
key Key
value interface{}
}
// New creates a new Cache.
// If maxEntries is zero, the cache has no limit and it's assumed
// that eviction is done by the caller.
func New(maxEntries int) *Cache {
return &Cache{
MaxEntries: maxEntries,
ll: list.New(),
cache: make(map[interface{}]*list.Element),
}
}
// Add adds a value to the cache.
func (c *Cache) Add(key Key, value interface{}) {
if c.cache == nil {
c.cache = make(map[interface{}]*list.Element)
c.ll = list.New()
}
if ee, ok := c.cache[key]; ok {
c.ll.MoveToFront(ee)
ee.Value.(*entry).value = value
return
}
ele := c.ll.PushFront(&entry{key, value})
c.cache[key] = ele
if c.MaxEntries != 0 && c.ll.Len() > c.MaxEntries {
c.RemoveOldest()
}
}
// Get looks up a key's value from the cache.
func (c *Cache) Get(key Key) (value interface{}, ok bool) {
if c.cache == nil {
return
}
if ele, hit := c.cache[key]; hit {
c.ll.MoveToFront(ele)
return ele.Value.(*entry).value, true
}
return
}
// Remove removes the provided key from the cache.
func (c *Cache) Remove(key Key) {
if c.cache == nil {
return
}
if ele, hit := c.cache[key]; hit {
c.removeElement(ele)
}
}
// RemoveOldest removes the oldest item from the cache.
func (c *Cache) RemoveOldest() {
if c.cache == nil {
return
}
ele := c.ll.Back()
if ele != nil {
c.removeElement(ele)
}
}
func (c *Cache) removeElement(e *list.Element) {
c.ll.Remove(e)
kv := e.Value.(*entry)
delete(c.cache, kv.key)
if c.OnEvicted != nil {
c.OnEvicted(kv.key, kv.value)
}
}
// Len returns the number of items in the cache.
func (c *Cache) Len() int {
if c.cache == nil {
return 0
}
return c.ll.Len()
}
// Clear purges all stored items from the cache.
func (c *Cache) Clear() {
if c.OnEvicted != nil {
for _, e := range c.cache {
kv := e.Value.(*entry)
c.OnEvicted(kv.key, kv.value)
}
}
c.ll = nil
c.cache = nil
}

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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package core provides support for event based telemetry.
package core
import (
"fmt"
"time"
"golang.org/x/tools/internal/event/label"
)
// Event holds the information about an event of note that ocurred.
type Event struct {
at time.Time
// As events are often on the stack, storing the first few labels directly
// in the event can avoid an allocation at all for the very common cases of
// simple events.
// The length needs to be large enough to cope with the majority of events
// but no so large as to cause undue stack pressure.
// A log message with two values will use 3 labels (one for each value and
// one for the message itself).
static [3]label.Label // inline storage for the first few labels
dynamic []label.Label // dynamically sized storage for remaining labels
}
// eventLabelMap implements label.Map for a the labels of an Event.
type eventLabelMap struct {
event Event
}
func (ev Event) At() time.Time { return ev.at }
func (ev Event) Format(f fmt.State, r rune) {
if !ev.at.IsZero() {
fmt.Fprint(f, ev.at.Format("2006/01/02 15:04:05 "))
}
for index := 0; ev.Valid(index); index++ {
if l := ev.Label(index); l.Valid() {
fmt.Fprintf(f, "\n\t%v", l)
}
}
}
func (ev Event) Valid(index int) bool {
return index >= 0 && index < len(ev.static)+len(ev.dynamic)
}
func (ev Event) Label(index int) label.Label {
if index < len(ev.static) {
return ev.static[index]
}
return ev.dynamic[index-len(ev.static)]
}
func (ev Event) Find(key label.Key) label.Label {
for _, l := range ev.static {
if l.Key() == key {
return l
}
}
for _, l := range ev.dynamic {
if l.Key() == key {
return l
}
}
return label.Label{}
}
func MakeEvent(static [3]label.Label, labels []label.Label) Event {
return Event{
static: static,
dynamic: labels,
}
}
// CloneEvent event returns a copy of the event with the time adjusted to at.
func CloneEvent(ev Event, at time.Time) Event {
ev.at = at
return ev
}

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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package core
import (
"context"
"sync/atomic"
"time"
"unsafe"
"golang.org/x/tools/internal/event/label"
)
// Exporter is a function that handles events.
// It may return a modified context and event.
type Exporter func(context.Context, Event, label.Map) context.Context
var (
exporter unsafe.Pointer
)
// SetExporter sets the global exporter function that handles all events.
// The exporter is called synchronously from the event call site, so it should
// return quickly so as not to hold up user code.
func SetExporter(e Exporter) {
p := unsafe.Pointer(&e)
if e == nil {
// &e is always valid, and so p is always valid, but for the early abort
// of ProcessEvent to be efficient it needs to make the nil check on the
// pointer without having to dereference it, so we make the nil function
// also a nil pointer
p = nil
}
atomic.StorePointer(&exporter, p)
}
// deliver is called to deliver an event to the supplied exporter.
// it will fill in the time.
func deliver(ctx context.Context, exporter Exporter, ev Event) context.Context {
// add the current time to the event
ev.at = time.Now()
// hand the event off to the current exporter
return exporter(ctx, ev, ev)
}
// Export is called to deliver an event to the global exporter if set.
func Export(ctx context.Context, ev Event) context.Context {
// get the global exporter and abort early if there is not one
exporterPtr := (*Exporter)(atomic.LoadPointer(&exporter))
if exporterPtr == nil {
return ctx
}
return deliver(ctx, *exporterPtr, ev)
}
// ExportPair is called to deliver a start event to the supplied exporter.
// It also returns a function that will deliver the end event to the same
// exporter.
// It will fill in the time.
func ExportPair(ctx context.Context, begin, end Event) (context.Context, func()) {
// get the global exporter and abort early if there is not one
exporterPtr := (*Exporter)(atomic.LoadPointer(&exporter))
if exporterPtr == nil {
return ctx, func() {}
}
ctx = deliver(ctx, *exporterPtr, begin)
return ctx, func() { deliver(ctx, *exporterPtr, end) }
}

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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package core
import (
"context"
"golang.org/x/tools/internal/event/keys"
"golang.org/x/tools/internal/event/label"
)
// Log1 takes a message and one label delivers a log event to the exporter.
// It is a customized version of Print that is faster and does no allocation.
func Log1(ctx context.Context, message string, t1 label.Label) {
Export(ctx, MakeEvent([3]label.Label{
keys.Msg.Of(message),
t1,
}, nil))
}
// Log2 takes a message and two labels and delivers a log event to the exporter.
// It is a customized version of Print that is faster and does no allocation.
func Log2(ctx context.Context, message string, t1 label.Label, t2 label.Label) {
Export(ctx, MakeEvent([3]label.Label{
keys.Msg.Of(message),
t1,
t2,
}, nil))
}
// Metric1 sends a label event to the exporter with the supplied labels.
func Metric1(ctx context.Context, t1 label.Label) context.Context {
return Export(ctx, MakeEvent([3]label.Label{
keys.Metric.New(),
t1,
}, nil))
}
// Metric2 sends a label event to the exporter with the supplied labels.
func Metric2(ctx context.Context, t1, t2 label.Label) context.Context {
return Export(ctx, MakeEvent([3]label.Label{
keys.Metric.New(),
t1,
t2,
}, nil))
}
// Start1 sends a span start event with the supplied label list to the exporter.
// It also returns a function that will end the span, which should normally be
// deferred.
func Start1(ctx context.Context, name string, t1 label.Label) (context.Context, func()) {
return ExportPair(ctx,
MakeEvent([3]label.Label{
keys.Start.Of(name),
t1,
}, nil),
MakeEvent([3]label.Label{
keys.End.New(),
}, nil))
}
// Start2 sends a span start event with the supplied label list to the exporter.
// It also returns a function that will end the span, which should normally be
// deferred.
func Start2(ctx context.Context, name string, t1, t2 label.Label) (context.Context, func()) {
return ExportPair(ctx,
MakeEvent([3]label.Label{
keys.Start.Of(name),
t1,
t2,
}, nil),
MakeEvent([3]label.Label{
keys.End.New(),
}, nil))
}

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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package event provides a set of packages that cover the main
// concepts of telemetry in an implementation agnostic way.
package event

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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package event
import (
"context"
"golang.org/x/tools/internal/event/core"
"golang.org/x/tools/internal/event/keys"
"golang.org/x/tools/internal/event/label"
)
// Exporter is a function that handles events.
// It may return a modified context and event.
type Exporter func(context.Context, core.Event, label.Map) context.Context
// SetExporter sets the global exporter function that handles all events.
// The exporter is called synchronously from the event call site, so it should
// return quickly so as not to hold up user code.
func SetExporter(e Exporter) {
core.SetExporter(core.Exporter(e))
}
// Log takes a message and a label list and combines them into a single event
// before delivering them to the exporter.
func Log(ctx context.Context, message string, labels ...label.Label) {
core.Export(ctx, core.MakeEvent([3]label.Label{
keys.Msg.Of(message),
}, labels))
}
// IsLog returns true if the event was built by the Log function.
// It is intended to be used in exporters to identify the semantics of the
// event when deciding what to do with it.
func IsLog(ev core.Event) bool {
return ev.Label(0).Key() == keys.Msg
}
// Error takes a message and a label list and combines them into a single event
// before delivering them to the exporter. It captures the error in the
// delivered event.
func Error(ctx context.Context, message string, err error, labels ...label.Label) {
core.Export(ctx, core.MakeEvent([3]label.Label{
keys.Msg.Of(message),
keys.Err.Of(err),
}, labels))
}
// IsError returns true if the event was built by the Error function.
// It is intended to be used in exporters to identify the semantics of the
// event when deciding what to do with it.
func IsError(ev core.Event) bool {
return ev.Label(0).Key() == keys.Msg &&
ev.Label(1).Key() == keys.Err
}
// Metric sends a label event to the exporter with the supplied labels.
func Metric(ctx context.Context, labels ...label.Label) {
core.Export(ctx, core.MakeEvent([3]label.Label{
keys.Metric.New(),
}, labels))
}
// IsMetric returns true if the event was built by the Metric function.
// It is intended to be used in exporters to identify the semantics of the
// event when deciding what to do with it.
func IsMetric(ev core.Event) bool {
return ev.Label(0).Key() == keys.Metric
}
// Label sends a label event to the exporter with the supplied labels.
func Label(ctx context.Context, labels ...label.Label) context.Context {
return core.Export(ctx, core.MakeEvent([3]label.Label{
keys.Label.New(),
}, labels))
}
// IsLabel returns true if the event was built by the Label function.
// It is intended to be used in exporters to identify the semantics of the
// event when deciding what to do with it.
func IsLabel(ev core.Event) bool {
return ev.Label(0).Key() == keys.Label
}
// Start sends a span start event with the supplied label list to the exporter.
// It also returns a function that will end the span, which should normally be
// deferred.
func Start(ctx context.Context, name string, labels ...label.Label) (context.Context, func()) {
return core.ExportPair(ctx,
core.MakeEvent([3]label.Label{
keys.Start.Of(name),
}, labels),
core.MakeEvent([3]label.Label{
keys.End.New(),
}, nil))
}
// IsStart returns true if the event was built by the Start function.
// It is intended to be used in exporters to identify the semantics of the
// event when deciding what to do with it.
func IsStart(ev core.Event) bool {
return ev.Label(0).Key() == keys.Start
}
// IsEnd returns true if the event was built by the End function.
// It is intended to be used in exporters to identify the semantics of the
// event when deciding what to do with it.
func IsEnd(ev core.Event) bool {
return ev.Label(0).Key() == keys.End
}
// Detach returns a context without an associated span.
// This allows the creation of spans that are not children of the current span.
func Detach(ctx context.Context) context.Context {
return core.Export(ctx, core.MakeEvent([3]label.Label{
keys.Detach.New(),
}, nil))
}
// IsDetach returns true if the event was built by the Detach function.
// It is intended to be used in exporters to identify the semantics of the
// event when deciding what to do with it.
func IsDetach(ev core.Event) bool {
return ev.Label(0).Key() == keys.Detach
}

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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package keys
import (
"fmt"
"io"
"math"
"strconv"
"golang.org/x/tools/internal/event/label"
)
// Value represents a key for untyped values.
type Value struct {
name string
description string
}
// New creates a new Key for untyped values.
func New(name, description string) *Value {
return &Value{name: name, description: description}
}
func (k *Value) Name() string { return k.name }
func (k *Value) Description() string { return k.description }
func (k *Value) Format(w io.Writer, buf []byte, l label.Label) {
fmt.Fprint(w, k.From(l))
}
// Get can be used to get a label for the key from a label.Map.
func (k *Value) Get(lm label.Map) interface{} {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return nil
}
// From can be used to get a value from a Label.
func (k *Value) From(t label.Label) interface{} { return t.UnpackValue() }
// Of creates a new Label with this key and the supplied value.
func (k *Value) Of(value interface{}) label.Label { return label.OfValue(k, value) }
// Tag represents a key for tagging labels that have no value.
// These are used when the existence of the label is the entire information it
// carries, such as marking events to be of a specific kind, or from a specific
// package.
type Tag struct {
name string
description string
}
// NewTag creates a new Key for tagging labels.
func NewTag(name, description string) *Tag {
return &Tag{name: name, description: description}
}
func (k *Tag) Name() string { return k.name }
func (k *Tag) Description() string { return k.description }
func (k *Tag) Format(w io.Writer, buf []byte, l label.Label) {}
// New creates a new Label with this key.
func (k *Tag) New() label.Label { return label.OfValue(k, nil) }
// Int represents a key
type Int struct {
name string
description string
}
// NewInt creates a new Key for int values.
func NewInt(name, description string) *Int {
return &Int{name: name, description: description}
}
func (k *Int) Name() string { return k.name }
func (k *Int) Description() string { return k.description }
func (k *Int) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendInt(buf, int64(k.From(l)), 10))
}
// Of creates a new Label with this key and the supplied value.
func (k *Int) Of(v int) label.Label { return label.Of64(k, uint64(v)) }
// Get can be used to get a label for the key from a label.Map.
func (k *Int) Get(lm label.Map) int {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *Int) From(t label.Label) int { return int(t.Unpack64()) }
// Int8 represents a key
type Int8 struct {
name string
description string
}
// NewInt8 creates a new Key for int8 values.
func NewInt8(name, description string) *Int8 {
return &Int8{name: name, description: description}
}
func (k *Int8) Name() string { return k.name }
func (k *Int8) Description() string { return k.description }
func (k *Int8) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendInt(buf, int64(k.From(l)), 10))
}
// Of creates a new Label with this key and the supplied value.
func (k *Int8) Of(v int8) label.Label { return label.Of64(k, uint64(v)) }
// Get can be used to get a label for the key from a label.Map.
func (k *Int8) Get(lm label.Map) int8 {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *Int8) From(t label.Label) int8 { return int8(t.Unpack64()) }
// Int16 represents a key
type Int16 struct {
name string
description string
}
// NewInt16 creates a new Key for int16 values.
func NewInt16(name, description string) *Int16 {
return &Int16{name: name, description: description}
}
func (k *Int16) Name() string { return k.name }
func (k *Int16) Description() string { return k.description }
func (k *Int16) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendInt(buf, int64(k.From(l)), 10))
}
// Of creates a new Label with this key and the supplied value.
func (k *Int16) Of(v int16) label.Label { return label.Of64(k, uint64(v)) }
// Get can be used to get a label for the key from a label.Map.
func (k *Int16) Get(lm label.Map) int16 {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *Int16) From(t label.Label) int16 { return int16(t.Unpack64()) }
// Int32 represents a key
type Int32 struct {
name string
description string
}
// NewInt32 creates a new Key for int32 values.
func NewInt32(name, description string) *Int32 {
return &Int32{name: name, description: description}
}
func (k *Int32) Name() string { return k.name }
func (k *Int32) Description() string { return k.description }
func (k *Int32) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendInt(buf, int64(k.From(l)), 10))
}
// Of creates a new Label with this key and the supplied value.
func (k *Int32) Of(v int32) label.Label { return label.Of64(k, uint64(v)) }
// Get can be used to get a label for the key from a label.Map.
func (k *Int32) Get(lm label.Map) int32 {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *Int32) From(t label.Label) int32 { return int32(t.Unpack64()) }
// Int64 represents a key
type Int64 struct {
name string
description string
}
// NewInt64 creates a new Key for int64 values.
func NewInt64(name, description string) *Int64 {
return &Int64{name: name, description: description}
}
func (k *Int64) Name() string { return k.name }
func (k *Int64) Description() string { return k.description }
func (k *Int64) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendInt(buf, k.From(l), 10))
}
// Of creates a new Label with this key and the supplied value.
func (k *Int64) Of(v int64) label.Label { return label.Of64(k, uint64(v)) }
// Get can be used to get a label for the key from a label.Map.
func (k *Int64) Get(lm label.Map) int64 {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *Int64) From(t label.Label) int64 { return int64(t.Unpack64()) }
// UInt represents a key
type UInt struct {
name string
description string
}
// NewUInt creates a new Key for uint values.
func NewUInt(name, description string) *UInt {
return &UInt{name: name, description: description}
}
func (k *UInt) Name() string { return k.name }
func (k *UInt) Description() string { return k.description }
func (k *UInt) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendUint(buf, uint64(k.From(l)), 10))
}
// Of creates a new Label with this key and the supplied value.
func (k *UInt) Of(v uint) label.Label { return label.Of64(k, uint64(v)) }
// Get can be used to get a label for the key from a label.Map.
func (k *UInt) Get(lm label.Map) uint {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *UInt) From(t label.Label) uint { return uint(t.Unpack64()) }
// UInt8 represents a key
type UInt8 struct {
name string
description string
}
// NewUInt8 creates a new Key for uint8 values.
func NewUInt8(name, description string) *UInt8 {
return &UInt8{name: name, description: description}
}
func (k *UInt8) Name() string { return k.name }
func (k *UInt8) Description() string { return k.description }
func (k *UInt8) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendUint(buf, uint64(k.From(l)), 10))
}
// Of creates a new Label with this key and the supplied value.
func (k *UInt8) Of(v uint8) label.Label { return label.Of64(k, uint64(v)) }
// Get can be used to get a label for the key from a label.Map.
func (k *UInt8) Get(lm label.Map) uint8 {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *UInt8) From(t label.Label) uint8 { return uint8(t.Unpack64()) }
// UInt16 represents a key
type UInt16 struct {
name string
description string
}
// NewUInt16 creates a new Key for uint16 values.
func NewUInt16(name, description string) *UInt16 {
return &UInt16{name: name, description: description}
}
func (k *UInt16) Name() string { return k.name }
func (k *UInt16) Description() string { return k.description }
func (k *UInt16) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendUint(buf, uint64(k.From(l)), 10))
}
// Of creates a new Label with this key and the supplied value.
func (k *UInt16) Of(v uint16) label.Label { return label.Of64(k, uint64(v)) }
// Get can be used to get a label for the key from a label.Map.
func (k *UInt16) Get(lm label.Map) uint16 {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *UInt16) From(t label.Label) uint16 { return uint16(t.Unpack64()) }
// UInt32 represents a key
type UInt32 struct {
name string
description string
}
// NewUInt32 creates a new Key for uint32 values.
func NewUInt32(name, description string) *UInt32 {
return &UInt32{name: name, description: description}
}
func (k *UInt32) Name() string { return k.name }
func (k *UInt32) Description() string { return k.description }
func (k *UInt32) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendUint(buf, uint64(k.From(l)), 10))
}
// Of creates a new Label with this key and the supplied value.
func (k *UInt32) Of(v uint32) label.Label { return label.Of64(k, uint64(v)) }
// Get can be used to get a label for the key from a label.Map.
func (k *UInt32) Get(lm label.Map) uint32 {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *UInt32) From(t label.Label) uint32 { return uint32(t.Unpack64()) }
// UInt64 represents a key
type UInt64 struct {
name string
description string
}
// NewUInt64 creates a new Key for uint64 values.
func NewUInt64(name, description string) *UInt64 {
return &UInt64{name: name, description: description}
}
func (k *UInt64) Name() string { return k.name }
func (k *UInt64) Description() string { return k.description }
func (k *UInt64) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendUint(buf, k.From(l), 10))
}
// Of creates a new Label with this key and the supplied value.
func (k *UInt64) Of(v uint64) label.Label { return label.Of64(k, v) }
// Get can be used to get a label for the key from a label.Map.
func (k *UInt64) Get(lm label.Map) uint64 {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *UInt64) From(t label.Label) uint64 { return t.Unpack64() }
// Float32 represents a key
type Float32 struct {
name string
description string
}
// NewFloat32 creates a new Key for float32 values.
func NewFloat32(name, description string) *Float32 {
return &Float32{name: name, description: description}
}
func (k *Float32) Name() string { return k.name }
func (k *Float32) Description() string { return k.description }
func (k *Float32) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendFloat(buf, float64(k.From(l)), 'E', -1, 32))
}
// Of creates a new Label with this key and the supplied value.
func (k *Float32) Of(v float32) label.Label {
return label.Of64(k, uint64(math.Float32bits(v)))
}
// Get can be used to get a label for the key from a label.Map.
func (k *Float32) Get(lm label.Map) float32 {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *Float32) From(t label.Label) float32 {
return math.Float32frombits(uint32(t.Unpack64()))
}
// Float64 represents a key
type Float64 struct {
name string
description string
}
// NewFloat64 creates a new Key for int64 values.
func NewFloat64(name, description string) *Float64 {
return &Float64{name: name, description: description}
}
func (k *Float64) Name() string { return k.name }
func (k *Float64) Description() string { return k.description }
func (k *Float64) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendFloat(buf, k.From(l), 'E', -1, 64))
}
// Of creates a new Label with this key and the supplied value.
func (k *Float64) Of(v float64) label.Label {
return label.Of64(k, math.Float64bits(v))
}
// Get can be used to get a label for the key from a label.Map.
func (k *Float64) Get(lm label.Map) float64 {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return 0
}
// From can be used to get a value from a Label.
func (k *Float64) From(t label.Label) float64 {
return math.Float64frombits(t.Unpack64())
}
// String represents a key
type String struct {
name string
description string
}
// NewString creates a new Key for int64 values.
func NewString(name, description string) *String {
return &String{name: name, description: description}
}
func (k *String) Name() string { return k.name }
func (k *String) Description() string { return k.description }
func (k *String) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendQuote(buf, k.From(l)))
}
// Of creates a new Label with this key and the supplied value.
func (k *String) Of(v string) label.Label { return label.OfString(k, v) }
// Get can be used to get a label for the key from a label.Map.
func (k *String) Get(lm label.Map) string {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return ""
}
// From can be used to get a value from a Label.
func (k *String) From(t label.Label) string { return t.UnpackString() }
// Boolean represents a key
type Boolean struct {
name string
description string
}
// NewBoolean creates a new Key for bool values.
func NewBoolean(name, description string) *Boolean {
return &Boolean{name: name, description: description}
}
func (k *Boolean) Name() string { return k.name }
func (k *Boolean) Description() string { return k.description }
func (k *Boolean) Format(w io.Writer, buf []byte, l label.Label) {
w.Write(strconv.AppendBool(buf, k.From(l)))
}
// Of creates a new Label with this key and the supplied value.
func (k *Boolean) Of(v bool) label.Label {
if v {
return label.Of64(k, 1)
}
return label.Of64(k, 0)
}
// Get can be used to get a label for the key from a label.Map.
func (k *Boolean) Get(lm label.Map) bool {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return false
}
// From can be used to get a value from a Label.
func (k *Boolean) From(t label.Label) bool { return t.Unpack64() > 0 }
// Error represents a key
type Error struct {
name string
description string
}
// NewError creates a new Key for int64 values.
func NewError(name, description string) *Error {
return &Error{name: name, description: description}
}
func (k *Error) Name() string { return k.name }
func (k *Error) Description() string { return k.description }
func (k *Error) Format(w io.Writer, buf []byte, l label.Label) {
io.WriteString(w, k.From(l).Error())
}
// Of creates a new Label with this key and the supplied value.
func (k *Error) Of(v error) label.Label { return label.OfValue(k, v) }
// Get can be used to get a label for the key from a label.Map.
func (k *Error) Get(lm label.Map) error {
if t := lm.Find(k); t.Valid() {
return k.From(t)
}
return nil
}
// From can be used to get a value from a Label.
func (k *Error) From(t label.Label) error {
err, _ := t.UnpackValue().(error)
return err
}

22
vendor/golang.org/x/tools/internal/event/keys/standard.go generated vendored Normal file
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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package keys
var (
// Msg is a key used to add message strings to label lists.
Msg = NewString("message", "a readable message")
// Label is a key used to indicate an event adds labels to the context.
Label = NewTag("label", "a label context marker")
// Start is used for things like traces that have a name.
Start = NewString("start", "span start")
// Metric is a key used to indicate an event records metrics.
End = NewTag("end", "a span end marker")
// Metric is a key used to indicate an event records metrics.
Detach = NewTag("detach", "a span detach marker")
// Err is a key used to add error values to label lists.
Err = NewError("error", "an error that occurred")
// Metric is a key used to indicate an event records metrics.
Metric = NewTag("metric", "a metric event marker")
)

213
vendor/golang.org/x/tools/internal/event/label/label.go generated vendored Normal file
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package label
import (
"fmt"
"io"
"reflect"
"unsafe"
)
// Key is used as the identity of a Label.
// Keys are intended to be compared by pointer only, the name should be unique
// for communicating with external systems, but it is not required or enforced.
type Key interface {
// Name returns the key name.
Name() string
// Description returns a string that can be used to describe the value.
Description() string
// Format is used in formatting to append the value of the label to the
// supplied buffer.
// The formatter may use the supplied buf as a scratch area to avoid
// allocations.
Format(w io.Writer, buf []byte, l Label)
}
// Label holds a key and value pair.
// It is normally used when passing around lists of labels.
type Label struct {
key Key
packed uint64
untyped interface{}
}
// Map is the interface to a collection of Labels indexed by key.
type Map interface {
// Find returns the label that matches the supplied key.
Find(key Key) Label
}
// List is the interface to something that provides an iterable
// list of labels.
// Iteration should start from 0 and continue until Valid returns false.
type List interface {
// Valid returns true if the index is within range for the list.
// It does not imply the label at that index will itself be valid.
Valid(index int) bool
// Label returns the label at the given index.
Label(index int) Label
}
// list implements LabelList for a list of Labels.
type list struct {
labels []Label
}
// filter wraps a LabelList filtering out specific labels.
type filter struct {
keys []Key
underlying List
}
// listMap implements LabelMap for a simple list of labels.
type listMap struct {
labels []Label
}
// mapChain implements LabelMap for a list of underlying LabelMap.
type mapChain struct {
maps []Map
}
// OfValue creates a new label from the key and value.
// This method is for implementing new key types, label creation should
// normally be done with the Of method of the key.
func OfValue(k Key, value interface{}) Label { return Label{key: k, untyped: value} }
// UnpackValue assumes the label was built using LabelOfValue and returns the value
// that was passed to that constructor.
// This method is for implementing new key types, for type safety normal
// access should be done with the From method of the key.
func (t Label) UnpackValue() interface{} { return t.untyped }
// Of64 creates a new label from a key and a uint64. This is often
// used for non uint64 values that can be packed into a uint64.
// This method is for implementing new key types, label creation should
// normally be done with the Of method of the key.
func Of64(k Key, v uint64) Label { return Label{key: k, packed: v} }
// Unpack64 assumes the label was built using LabelOf64 and returns the value that
// was passed to that constructor.
// This method is for implementing new key types, for type safety normal
// access should be done with the From method of the key.
func (t Label) Unpack64() uint64 { return t.packed }
// OfString creates a new label from a key and a string.
// This method is for implementing new key types, label creation should
// normally be done with the Of method of the key.
func OfString(k Key, v string) Label {
hdr := (*reflect.StringHeader)(unsafe.Pointer(&v))
return Label{
key: k,
packed: uint64(hdr.Len),
untyped: unsafe.Pointer(hdr.Data),
}
}
// UnpackString assumes the label was built using LabelOfString and returns the
// value that was passed to that constructor.
// This method is for implementing new key types, for type safety normal
// access should be done with the From method of the key.
func (t Label) UnpackString() string {
var v string
hdr := (*reflect.StringHeader)(unsafe.Pointer(&v))
hdr.Data = uintptr(t.untyped.(unsafe.Pointer))
hdr.Len = int(t.packed)
return *(*string)(unsafe.Pointer(hdr))
}
// Valid returns true if the Label is a valid one (it has a key).
func (t Label) Valid() bool { return t.key != nil }
// Key returns the key of this Label.
func (t Label) Key() Key { return t.key }
// Format is used for debug printing of labels.
func (t Label) Format(f fmt.State, r rune) {
if !t.Valid() {
io.WriteString(f, `nil`)
return
}
io.WriteString(f, t.Key().Name())
io.WriteString(f, "=")
var buf [128]byte
t.Key().Format(f, buf[:0], t)
}
func (l *list) Valid(index int) bool {
return index >= 0 && index < len(l.labels)
}
func (l *list) Label(index int) Label {
return l.labels[index]
}
func (f *filter) Valid(index int) bool {
return f.underlying.Valid(index)
}
func (f *filter) Label(index int) Label {
l := f.underlying.Label(index)
for _, f := range f.keys {
if l.Key() == f {
return Label{}
}
}
return l
}
func (lm listMap) Find(key Key) Label {
for _, l := range lm.labels {
if l.Key() == key {
return l
}
}
return Label{}
}
func (c mapChain) Find(key Key) Label {
for _, src := range c.maps {
l := src.Find(key)
if l.Valid() {
return l
}
}
return Label{}
}
var emptyList = &list{}
func NewList(labels ...Label) List {
if len(labels) == 0 {
return emptyList
}
return &list{labels: labels}
}
func Filter(l List, keys ...Key) List {
if len(keys) == 0 {
return l
}
return &filter{keys: keys, underlying: l}
}
func NewMap(labels ...Label) Map {
return listMap{labels: labels}
}
func MergeMaps(srcs ...Map) Map {
var nonNil []Map
for _, src := range srcs {
if src != nil {
nonNil = append(nonNil, src)
}
}
if len(nonNil) == 1 {
return nonNil[0]
}
return mapChain{maps: nonNil}
}

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vendor/google.golang.org/grpc/internal/channelz/logging.go generated vendored Normal file
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/*
*
* Copyright 2020 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package channelz
import (
"fmt"
"google.golang.org/grpc/internal/grpclog"
)
// Info logs through grpclog.Info and adds a trace event if channelz is on.
func Info(id int64, args ...interface{}) {
if IsOn() {
AddTraceEvent(id, 1, &TraceEventDesc{
Desc: fmt.Sprint(args...),
Severity: CtINFO,
})
} else {
grpclog.InfoDepth(1, args...)
}
}
// Infof logs through grpclog.Infof and adds a trace event if channelz is on.
func Infof(id int64, format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
if IsOn() {
AddTraceEvent(id, 1, &TraceEventDesc{
Desc: msg,
Severity: CtINFO,
})
} else {
grpclog.InfoDepth(1, msg)
}
}
// Warning logs through grpclog.Warning and adds a trace event if channelz is on.
func Warning(id int64, args ...interface{}) {
if IsOn() {
AddTraceEvent(id, 1, &TraceEventDesc{
Desc: fmt.Sprint(args...),
Severity: CtWarning,
})
} else {
grpclog.WarningDepth(1, args...)
}
}
// Warningf logs through grpclog.Warningf and adds a trace event if channelz is on.
func Warningf(id int64, format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
if IsOn() {
AddTraceEvent(id, 1, &TraceEventDesc{
Desc: msg,
Severity: CtWarning,
})
} else {
grpclog.WarningDepth(1, msg)
}
}
// Error logs through grpclog.Error and adds a trace event if channelz is on.
func Error(id int64, args ...interface{}) {
if IsOn() {
AddTraceEvent(id, 1, &TraceEventDesc{
Desc: fmt.Sprint(args...),
Severity: CtError,
})
} else {
grpclog.ErrorDepth(1, args...)
}
}
// Errorf logs through grpclog.Errorf and adds a trace event if channelz is on.
func Errorf(id int64, format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
if IsOn() {
AddTraceEvent(id, 1, &TraceEventDesc{
Desc: msg,
Severity: CtError,
})
} else {
grpclog.ErrorDepth(1, msg)
}
}

118
vendor/google.golang.org/grpc/internal/grpclog/grpclog.go generated vendored Normal file
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/*
*
* Copyright 2020 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
// Package grpclog (internal) defines depth logging for grpc.
package grpclog
// Logger is the logger used for the non-depth log functions.
var Logger LoggerV2
// DepthLogger is the logger used for the depth log functions.
var DepthLogger DepthLoggerV2
// InfoDepth logs to the INFO log at the specified depth.
func InfoDepth(depth int, args ...interface{}) {
if DepthLogger != nil {
DepthLogger.InfoDepth(depth, args...)
} else {
Logger.Info(args...)
}
}
// WarningDepth logs to the WARNING log at the specified depth.
func WarningDepth(depth int, args ...interface{}) {
if DepthLogger != nil {
DepthLogger.WarningDepth(depth, args...)
} else {
Logger.Warning(args...)
}
}
// ErrorDepth logs to the ERROR log at the specified depth.
func ErrorDepth(depth int, args ...interface{}) {
if DepthLogger != nil {
DepthLogger.ErrorDepth(depth, args...)
} else {
Logger.Error(args...)
}
}
// FatalDepth logs to the FATAL log at the specified depth.
func FatalDepth(depth int, args ...interface{}) {
if DepthLogger != nil {
DepthLogger.FatalDepth(depth, args...)
} else {
Logger.Fatal(args...)
}
}
// LoggerV2 does underlying logging work for grpclog.
// This is a copy of the LoggerV2 defined in the external grpclog package. It
// is defined here to avoid a circular dependency.
type LoggerV2 interface {
// Info logs to INFO log. Arguments are handled in the manner of fmt.Print.
Info(args ...interface{})
// Infoln logs to INFO log. Arguments are handled in the manner of fmt.Println.
Infoln(args ...interface{})
// Infof logs to INFO log. Arguments are handled in the manner of fmt.Printf.
Infof(format string, args ...interface{})
// Warning logs to WARNING log. Arguments are handled in the manner of fmt.Print.
Warning(args ...interface{})
// Warningln logs to WARNING log. Arguments are handled in the manner of fmt.Println.
Warningln(args ...interface{})
// Warningf logs to WARNING log. Arguments are handled in the manner of fmt.Printf.
Warningf(format string, args ...interface{})
// Error logs to ERROR log. Arguments are handled in the manner of fmt.Print.
Error(args ...interface{})
// Errorln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
Errorln(args ...interface{})
// Errorf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
Errorf(format string, args ...interface{})
// Fatal logs to ERROR log. Arguments are handled in the manner of fmt.Print.
// gRPC ensures that all Fatal logs will exit with os.Exit(1).
// Implementations may also call os.Exit() with a non-zero exit code.
Fatal(args ...interface{})
// Fatalln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
// gRPC ensures that all Fatal logs will exit with os.Exit(1).
// Implementations may also call os.Exit() with a non-zero exit code.
Fatalln(args ...interface{})
// Fatalf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
// gRPC ensures that all Fatal logs will exit with os.Exit(1).
// Implementations may also call os.Exit() with a non-zero exit code.
Fatalf(format string, args ...interface{})
// V reports whether verbosity level l is at least the requested verbose level.
V(l int) bool
}
// DepthLoggerV2 logs at a specified call frame. If a LoggerV2 also implements
// DepthLoggerV2, the below functions will be called with the appropriate stack
// depth set for trivial functions the logger may ignore.
// This is a copy of the DepthLoggerV2 defined in the external grpclog package.
// It is defined here to avoid a circular dependency.
//
// This API is EXPERIMENTAL.
type DepthLoggerV2 interface {
// InfoDepth logs to INFO log at the specified depth. Arguments are handled in the manner of fmt.Print.
InfoDepth(depth int, args ...interface{})
// WarningDepth logs to WARNING log at the specified depth. Arguments are handled in the manner of fmt.Print.
WarningDepth(depth int, args ...interface{})
// ErrorDetph logs to ERROR log at the specified depth. Arguments are handled in the manner of fmt.Print.
ErrorDepth(depth int, args ...interface{})
// FatalDepth logs to FATAL log at the specified depth. Arguments are handled in the manner of fmt.Print.
FatalDepth(depth int, args ...interface{})
}

63
vendor/google.golang.org/grpc/internal/grpclog/prefixLogger.go generated vendored Normal file
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@ -0,0 +1,63 @@
/*
*
* Copyright 2020 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package grpclog
// PrefixLogger does logging with a prefix.
//
// Logging method on a nil logs without any prefix.
type PrefixLogger struct {
prefix string
}
// Infof does info logging.
func (pl *PrefixLogger) Infof(format string, args ...interface{}) {
if pl != nil {
// Handle nil, so the tests can pass in a nil logger.
format = pl.prefix + format
}
Logger.Infof(format, args...)
}
// Warningf does warning logging.
func (pl *PrefixLogger) Warningf(format string, args ...interface{}) {
if pl != nil {
format = pl.prefix + format
}
Logger.Warningf(format, args...)
}
// Errorf does error logging.
func (pl *PrefixLogger) Errorf(format string, args ...interface{}) {
if pl != nil {
format = pl.prefix + format
}
Logger.Errorf(format, args...)
}
// Debugf does info logging at verbose level 2.
func (pl *PrefixLogger) Debugf(format string, args ...interface{}) {
if Logger.V(2) {
pl.Infof(format, args...)
}
}
// NewPrefixLogger creates a prefix logger with the given prefix.
func NewPrefixLogger(prefix string) *PrefixLogger {
return &PrefixLogger{prefix: prefix}
}

55
vendor/google.golang.org/grpc/internal/grpcutil/target.go generated vendored Normal file
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/*
*
* Copyright 2020 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
// Package grpcutil provides a bunch of utility functions to be used across the
// gRPC codebase.
package grpcutil
import (
"strings"
"google.golang.org/grpc/resolver"
)
// split2 returns the values from strings.SplitN(s, sep, 2).
// If sep is not found, it returns ("", "", false) instead.
func split2(s, sep string) (string, string, bool) {
spl := strings.SplitN(s, sep, 2)
if len(spl) < 2 {
return "", "", false
}
return spl[0], spl[1], true
}
// ParseTarget splits target into a resolver.Target struct containing scheme,
// authority and endpoint.
//
// If target is not a valid scheme://authority/endpoint, it returns {Endpoint:
// target}.
func ParseTarget(target string) (ret resolver.Target) {
var ok bool
ret.Scheme, ret.Endpoint, ok = split2(target, "://")
if !ok {
return resolver.Target{Endpoint: target}
}
ret.Authority, ret.Endpoint, ok = split2(ret.Endpoint, "/")
if !ok {
return resolver.Target{Endpoint: target}
}
return ret
}