forked from TrueCloudLab/restic
Upadte golang.org/x/net/context
This commit is contained in:
Alexander Neumann
parent
799cc37c22
commit
da83bd8265
12 changed files with 722 additions and 398 deletions
4
vendor/manifest
vendored
4
vendor/manifest
vendored
|
|
@ -80,8 +80,8 @@
|
|||
{
|
||||
"importpath": "golang.org/x/net/context",
|
||||
"repository": "https://go.googlesource.com/net",
|
||||
"revision": "7654728e381988afd88e58cabfd6363a5ea91810",
|
||||
"branch": "HEAD",
|
||||
"revision": "de35ec43e7a9aabd6a9c54d2898220ea7e44de7d",
|
||||
"branch": "master",
|
||||
"path": "/context"
|
||||
},
|
||||
{
|
||||
|
|
|
|||
297
vendor/src/golang.org/x/net/context/context.go
vendored
297
vendor/src/golang.org/x/net/context/context.go
vendored
|
|
@ -36,12 +36,7 @@
|
|||
// Contexts.
|
||||
package context // import "golang.org/x/net/context"
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"sync"
|
||||
"time"
|
||||
)
|
||||
import "time"
|
||||
|
||||
// A Context carries a deadline, a cancelation signal, and other values across
|
||||
// API boundaries.
|
||||
|
|
@ -66,7 +61,7 @@ type Context interface {
|
|||
//
|
||||
// // Stream generates values with DoSomething and sends them to out
|
||||
// // until DoSomething returns an error or ctx.Done is closed.
|
||||
// func Stream(ctx context.Context, out <-chan Value) error {
|
||||
// func Stream(ctx context.Context, out chan<- Value) error {
|
||||
// for {
|
||||
// v, err := DoSomething(ctx)
|
||||
// if err != nil {
|
||||
|
|
@ -138,48 +133,6 @@ type Context interface {
|
|||
Value(key interface{}) interface{}
|
||||
}
|
||||
|
||||
// Canceled is the error returned by Context.Err when the context is canceled.
|
||||
var Canceled = errors.New("context canceled")
|
||||
|
||||
// DeadlineExceeded is the error returned by Context.Err when the context's
|
||||
// deadline passes.
|
||||
var DeadlineExceeded = errors.New("context deadline exceeded")
|
||||
|
||||
// An emptyCtx is never canceled, has no values, and has no deadline. It is not
|
||||
// struct{}, since vars of this type must have distinct addresses.
|
||||
type emptyCtx int
|
||||
|
||||
func (*emptyCtx) Deadline() (deadline time.Time, ok bool) {
|
||||
return
|
||||
}
|
||||
|
||||
func (*emptyCtx) Done() <-chan struct{} {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (*emptyCtx) Err() error {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (*emptyCtx) Value(key interface{}) interface{} {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (e *emptyCtx) String() string {
|
||||
switch e {
|
||||
case background:
|
||||
return "context.Background"
|
||||
case todo:
|
||||
return "context.TODO"
|
||||
}
|
||||
return "unknown empty Context"
|
||||
}
|
||||
|
||||
var (
|
||||
background = new(emptyCtx)
|
||||
todo = new(emptyCtx)
|
||||
)
|
||||
|
||||
// Background returns a non-nil, empty Context. It is never canceled, has no
|
||||
// values, and has no deadline. It is typically used by the main function,
|
||||
// initialization, and tests, and as the top-level Context for incoming
|
||||
|
|
@ -189,7 +142,7 @@ func Background() Context {
|
|||
}
|
||||
|
||||
// TODO returns a non-nil, empty Context. Code should use context.TODO when
|
||||
// it's unclear which Context to use or it's is not yet available (because the
|
||||
// it's unclear which Context to use or it is not yet available (because the
|
||||
// surrounding function has not yet been extended to accept a Context
|
||||
// parameter). TODO is recognized by static analysis tools that determine
|
||||
// whether Contexts are propagated correctly in a program.
|
||||
|
|
@ -201,247 +154,3 @@ func TODO() Context {
|
|||
// A CancelFunc does not wait for the work to stop.
|
||||
// After the first call, subsequent calls to a CancelFunc do nothing.
|
||||
type CancelFunc func()
|
||||
|
||||
// WithCancel returns a copy of parent with a new Done channel. The returned
|
||||
// context's Done channel is closed when the returned cancel function is called
|
||||
// or when the parent context's Done channel is closed, whichever happens first.
|
||||
//
|
||||
// Canceling this context releases resources associated with it, so code should
|
||||
// call cancel as soon as the operations running in this Context complete.
|
||||
func WithCancel(parent Context) (ctx Context, cancel CancelFunc) {
|
||||
c := newCancelCtx(parent)
|
||||
propagateCancel(parent, &c)
|
||||
return &c, func() { c.cancel(true, Canceled) }
|
||||
}
|
||||
|
||||
// newCancelCtx returns an initialized cancelCtx.
|
||||
func newCancelCtx(parent Context) cancelCtx {
|
||||
return cancelCtx{
|
||||
Context: parent,
|
||||
done: make(chan struct{}),
|
||||
}
|
||||
}
|
||||
|
||||
// propagateCancel arranges for child to be canceled when parent is.
|
||||
func propagateCancel(parent Context, child canceler) {
|
||||
if parent.Done() == nil {
|
||||
return // parent is never canceled
|
||||
}
|
||||
if p, ok := parentCancelCtx(parent); ok {
|
||||
p.mu.Lock()
|
||||
if p.err != nil {
|
||||
// parent has already been canceled
|
||||
child.cancel(false, p.err)
|
||||
} else {
|
||||
if p.children == nil {
|
||||
p.children = make(map[canceler]bool)
|
||||
}
|
||||
p.children[child] = true
|
||||
}
|
||||
p.mu.Unlock()
|
||||
} else {
|
||||
go func() {
|
||||
select {
|
||||
case <-parent.Done():
|
||||
child.cancel(false, parent.Err())
|
||||
case <-child.Done():
|
||||
}
|
||||
}()
|
||||
}
|
||||
}
|
||||
|
||||
// parentCancelCtx follows a chain of parent references until it finds a
|
||||
// *cancelCtx. This function understands how each of the concrete types in this
|
||||
// package represents its parent.
|
||||
func parentCancelCtx(parent Context) (*cancelCtx, bool) {
|
||||
for {
|
||||
switch c := parent.(type) {
|
||||
case *cancelCtx:
|
||||
return c, true
|
||||
case *timerCtx:
|
||||
return &c.cancelCtx, true
|
||||
case *valueCtx:
|
||||
parent = c.Context
|
||||
default:
|
||||
return nil, false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// removeChild removes a context from its parent.
|
||||
func removeChild(parent Context, child canceler) {
|
||||
p, ok := parentCancelCtx(parent)
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
p.mu.Lock()
|
||||
if p.children != nil {
|
||||
delete(p.children, child)
|
||||
}
|
||||
p.mu.Unlock()
|
||||
}
|
||||
|
||||
// A canceler is a context type that can be canceled directly. The
|
||||
// implementations are *cancelCtx and *timerCtx.
|
||||
type canceler interface {
|
||||
cancel(removeFromParent bool, err error)
|
||||
Done() <-chan struct{}
|
||||
}
|
||||
|
||||
// A cancelCtx can be canceled. When canceled, it also cancels any children
|
||||
// that implement canceler.
|
||||
type cancelCtx struct {
|
||||
Context
|
||||
|
||||
done chan struct{} // closed by the first cancel call.
|
||||
|
||||
mu sync.Mutex
|
||||
children map[canceler]bool // set to nil by the first cancel call
|
||||
err error // set to non-nil by the first cancel call
|
||||
}
|
||||
|
||||
func (c *cancelCtx) Done() <-chan struct{} {
|
||||
return c.done
|
||||
}
|
||||
|
||||
func (c *cancelCtx) Err() error {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
return c.err
|
||||
}
|
||||
|
||||
func (c *cancelCtx) String() string {
|
||||
return fmt.Sprintf("%v.WithCancel", c.Context)
|
||||
}
|
||||
|
||||
// cancel closes c.done, cancels each of c's children, and, if
|
||||
// removeFromParent is true, removes c from its parent's children.
|
||||
func (c *cancelCtx) cancel(removeFromParent bool, err error) {
|
||||
if err == nil {
|
||||
panic("context: internal error: missing cancel error")
|
||||
}
|
||||
c.mu.Lock()
|
||||
if c.err != nil {
|
||||
c.mu.Unlock()
|
||||
return // already canceled
|
||||
}
|
||||
c.err = err
|
||||
close(c.done)
|
||||
for child := range c.children {
|
||||
// NOTE: acquiring the child's lock while holding parent's lock.
|
||||
child.cancel(false, err)
|
||||
}
|
||||
c.children = nil
|
||||
c.mu.Unlock()
|
||||
|
||||
if removeFromParent {
|
||||
removeChild(c.Context, c)
|
||||
}
|
||||
}
|
||||
|
||||
// WithDeadline returns a copy of the parent context with the deadline adjusted
|
||||
// to be no later than d. If the parent's deadline is already earlier than d,
|
||||
// WithDeadline(parent, d) is semantically equivalent to parent. The returned
|
||||
// context's Done channel is closed when the deadline expires, when the returned
|
||||
// cancel function is called, or when the parent context's Done channel is
|
||||
// closed, whichever happens first.
|
||||
//
|
||||
// Canceling this context releases resources associated with it, so code should
|
||||
// call cancel as soon as the operations running in this Context complete.
|
||||
func WithDeadline(parent Context, deadline time.Time) (Context, CancelFunc) {
|
||||
if cur, ok := parent.Deadline(); ok && cur.Before(deadline) {
|
||||
// The current deadline is already sooner than the new one.
|
||||
return WithCancel(parent)
|
||||
}
|
||||
c := &timerCtx{
|
||||
cancelCtx: newCancelCtx(parent),
|
||||
deadline: deadline,
|
||||
}
|
||||
propagateCancel(parent, c)
|
||||
d := deadline.Sub(time.Now())
|
||||
if d <= 0 {
|
||||
c.cancel(true, DeadlineExceeded) // deadline has already passed
|
||||
return c, func() { c.cancel(true, Canceled) }
|
||||
}
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
if c.err == nil {
|
||||
c.timer = time.AfterFunc(d, func() {
|
||||
c.cancel(true, DeadlineExceeded)
|
||||
})
|
||||
}
|
||||
return c, func() { c.cancel(true, Canceled) }
|
||||
}
|
||||
|
||||
// A timerCtx carries a timer and a deadline. It embeds a cancelCtx to
|
||||
// implement Done and Err. It implements cancel by stopping its timer then
|
||||
// delegating to cancelCtx.cancel.
|
||||
type timerCtx struct {
|
||||
cancelCtx
|
||||
timer *time.Timer // Under cancelCtx.mu.
|
||||
|
||||
deadline time.Time
|
||||
}
|
||||
|
||||
func (c *timerCtx) Deadline() (deadline time.Time, ok bool) {
|
||||
return c.deadline, true
|
||||
}
|
||||
|
||||
func (c *timerCtx) String() string {
|
||||
return fmt.Sprintf("%v.WithDeadline(%s [%s])", c.cancelCtx.Context, c.deadline, c.deadline.Sub(time.Now()))
|
||||
}
|
||||
|
||||
func (c *timerCtx) cancel(removeFromParent bool, err error) {
|
||||
c.cancelCtx.cancel(false, err)
|
||||
if removeFromParent {
|
||||
// Remove this timerCtx from its parent cancelCtx's children.
|
||||
removeChild(c.cancelCtx.Context, c)
|
||||
}
|
||||
c.mu.Lock()
|
||||
if c.timer != nil {
|
||||
c.timer.Stop()
|
||||
c.timer = nil
|
||||
}
|
||||
c.mu.Unlock()
|
||||
}
|
||||
|
||||
// WithTimeout returns WithDeadline(parent, time.Now().Add(timeout)).
|
||||
//
|
||||
// Canceling this context releases resources associated with it, so code should
|
||||
// call cancel as soon as the operations running in this Context complete:
|
||||
//
|
||||
// func slowOperationWithTimeout(ctx context.Context) (Result, error) {
|
||||
// ctx, cancel := context.WithTimeout(ctx, 100*time.Millisecond)
|
||||
// defer cancel() // releases resources if slowOperation completes before timeout elapses
|
||||
// return slowOperation(ctx)
|
||||
// }
|
||||
func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc) {
|
||||
return WithDeadline(parent, time.Now().Add(timeout))
|
||||
}
|
||||
|
||||
// WithValue returns a copy of parent in which the value associated with key is
|
||||
// val.
|
||||
//
|
||||
// Use context Values only for request-scoped data that transits processes and
|
||||
// APIs, not for passing optional parameters to functions.
|
||||
func WithValue(parent Context, key interface{}, val interface{}) Context {
|
||||
return &valueCtx{parent, key, val}
|
||||
}
|
||||
|
||||
// A valueCtx carries a key-value pair. It implements Value for that key and
|
||||
// delegates all other calls to the embedded Context.
|
||||
type valueCtx struct {
|
||||
Context
|
||||
key, val interface{}
|
||||
}
|
||||
|
||||
func (c *valueCtx) String() string {
|
||||
return fmt.Sprintf("%v.WithValue(%#v, %#v)", c.Context, c.key, c.val)
|
||||
}
|
||||
|
||||
func (c *valueCtx) Value(key interface{}) interface{} {
|
||||
if c.key == key {
|
||||
return c.val
|
||||
}
|
||||
return c.Context.Value(key)
|
||||
}
|
||||
|
|
|
|||
|
|
@ -2,6 +2,8 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build !go1.7
|
||||
|
||||
package context
|
||||
|
||||
import (
|
||||
|
|
@ -375,7 +377,7 @@ func TestAllocs(t *testing.T) {
|
|||
<-c.Done()
|
||||
},
|
||||
limit: 8,
|
||||
gccgoLimit: 15,
|
||||
gccgoLimit: 16,
|
||||
},
|
||||
{
|
||||
desc: "WithCancel(bg)",
|
||||
|
|
@ -401,7 +403,7 @@ func TestAllocs(t *testing.T) {
|
|||
limit := test.limit
|
||||
if runtime.Compiler == "gccgo" {
|
||||
// gccgo does not yet do escape analysis.
|
||||
// TOOD(iant): Remove this when gccgo does do escape analysis.
|
||||
// TODO(iant): Remove this when gccgo does do escape analysis.
|
||||
limit = test.gccgoLimit
|
||||
}
|
||||
if n := testing.AllocsPerRun(100, test.f); n > limit {
|
||||
|
|
@ -536,7 +538,7 @@ func testLayers(t *testing.T, seed int64, testTimeout bool) {
|
|||
if testTimeout {
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
case <-time.After(timeout + timeout/10):
|
||||
case <-time.After(timeout + 100*time.Millisecond):
|
||||
errorf("ctx should have timed out")
|
||||
}
|
||||
checkValues("after timeout")
|
||||
|
|
|
|||
|
|
@ -1,18 +0,0 @@
|
|||
// Copyright 2015 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.
|
||||
|
||||
// +build go1.5
|
||||
|
||||
package ctxhttp
|
||||
|
||||
import "net/http"
|
||||
|
||||
func canceler(client *http.Client, req *http.Request) func() {
|
||||
ch := make(chan struct{})
|
||||
req.Cancel = ch
|
||||
|
||||
return func() {
|
||||
close(ch)
|
||||
}
|
||||
}
|
||||
|
|
@ -1,23 +0,0 @@
|
|||
// Copyright 2015 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.
|
||||
|
||||
// +build !go1.5
|
||||
|
||||
package ctxhttp
|
||||
|
||||
import "net/http"
|
||||
|
||||
type requestCanceler interface {
|
||||
CancelRequest(*http.Request)
|
||||
}
|
||||
|
||||
func canceler(client *http.Client, req *http.Request) func() {
|
||||
rc, ok := client.Transport.(requestCanceler)
|
||||
if !ok {
|
||||
return func() {}
|
||||
}
|
||||
return func() {
|
||||
rc.CancelRequest(req)
|
||||
}
|
||||
}
|
||||
|
|
@ -1,7 +1,9 @@
|
|||
// Copyright 2015 The Go Authors. All rights reserved.
|
||||
// Copyright 2016 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.
|
||||
|
||||
// +build go1.7
|
||||
|
||||
// Package ctxhttp provides helper functions for performing context-aware HTTP requests.
|
||||
package ctxhttp // import "golang.org/x/net/context/ctxhttp"
|
||||
|
||||
|
|
@ -14,35 +16,28 @@ import (
|
|||
"golang.org/x/net/context"
|
||||
)
|
||||
|
||||
// Do sends an HTTP request with the provided http.Client and returns an HTTP response.
|
||||
// Do sends an HTTP request with the provided http.Client and returns
|
||||
// an HTTP response.
|
||||
//
|
||||
// If the client is nil, http.DefaultClient is used.
|
||||
// If the context is canceled or times out, ctx.Err() will be returned.
|
||||
//
|
||||
// The provided ctx must be non-nil. If it is canceled or times out,
|
||||
// ctx.Err() will be returned.
|
||||
func Do(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
|
||||
if client == nil {
|
||||
client = http.DefaultClient
|
||||
}
|
||||
|
||||
// Request cancelation changed in Go 1.5, see cancelreq.go and cancelreq_go14.go.
|
||||
cancel := canceler(client, req)
|
||||
|
||||
type responseAndError struct {
|
||||
resp *http.Response
|
||||
err error
|
||||
}
|
||||
result := make(chan responseAndError, 1)
|
||||
|
||||
go func() {
|
||||
resp, err := client.Do(req)
|
||||
result <- responseAndError{resp, err}
|
||||
}()
|
||||
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
cancel()
|
||||
return nil, ctx.Err()
|
||||
case r := <-result:
|
||||
return r.resp, r.err
|
||||
resp, err := client.Do(req.WithContext(ctx))
|
||||
// If we got an error, and the context has been canceled,
|
||||
// the context's error is probably more useful.
|
||||
if err != nil {
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
err = ctx.Err()
|
||||
default:
|
||||
}
|
||||
}
|
||||
return resp, err
|
||||
}
|
||||
|
||||
// Get issues a GET request via the Do function.
|
||||
|
|
|
|||
28
vendor/src/golang.org/x/net/context/ctxhttp/ctxhttp_17_test.go
vendored
Normal file
28
vendor/src/golang.org/x/net/context/ctxhttp/ctxhttp_17_test.go
vendored
Normal file
|
|
@ -0,0 +1,28 @@
|
|||
// Copyright 2015 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.
|
||||
|
||||
// +build !plan9,go1.7
|
||||
|
||||
package ctxhttp
|
||||
|
||||
import (
|
||||
"io"
|
||||
"net/http"
|
||||
"net/http/httptest"
|
||||
"testing"
|
||||
|
||||
"context"
|
||||
)
|
||||
|
||||
func TestGo17Context(t *testing.T) {
|
||||
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
io.WriteString(w, "ok")
|
||||
}))
|
||||
ctx := context.Background()
|
||||
resp, err := Get(ctx, http.DefaultClient, ts.URL)
|
||||
if resp == nil || err != nil {
|
||||
t.Fatalf("error received from client: %v %v", err, resp)
|
||||
}
|
||||
resp.Body.Close()
|
||||
}
|
||||
147
vendor/src/golang.org/x/net/context/ctxhttp/ctxhttp_pre17.go
vendored
Normal file
147
vendor/src/golang.org/x/net/context/ctxhttp/ctxhttp_pre17.go
vendored
Normal file
|
|
@ -0,0 +1,147 @@
|
|||
// Copyright 2015 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.
|
||||
|
||||
// +build !go1.7
|
||||
|
||||
package ctxhttp // import "golang.org/x/net/context/ctxhttp"
|
||||
|
||||
import (
|
||||
"io"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"strings"
|
||||
|
||||
"golang.org/x/net/context"
|
||||
)
|
||||
|
||||
func nop() {}
|
||||
|
||||
var (
|
||||
testHookContextDoneBeforeHeaders = nop
|
||||
testHookDoReturned = nop
|
||||
testHookDidBodyClose = nop
|
||||
)
|
||||
|
||||
// Do sends an HTTP request with the provided http.Client and returns an HTTP response.
|
||||
// If the client is nil, http.DefaultClient is used.
|
||||
// If the context is canceled or times out, ctx.Err() will be returned.
|
||||
func Do(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
|
||||
if client == nil {
|
||||
client = http.DefaultClient
|
||||
}
|
||||
|
||||
// TODO(djd): Respect any existing value of req.Cancel.
|
||||
cancel := make(chan struct{})
|
||||
req.Cancel = cancel
|
||||
|
||||
type responseAndError struct {
|
||||
resp *http.Response
|
||||
err error
|
||||
}
|
||||
result := make(chan responseAndError, 1)
|
||||
|
||||
// Make local copies of test hooks closed over by goroutines below.
|
||||
// Prevents data races in tests.
|
||||
testHookDoReturned := testHookDoReturned
|
||||
testHookDidBodyClose := testHookDidBodyClose
|
||||
|
||||
go func() {
|
||||
resp, err := client.Do(req)
|
||||
testHookDoReturned()
|
||||
result <- responseAndError{resp, err}
|
||||
}()
|
||||
|
||||
var resp *http.Response
|
||||
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
testHookContextDoneBeforeHeaders()
|
||||
close(cancel)
|
||||
// Clean up after the goroutine calling client.Do:
|
||||
go func() {
|
||||
if r := <-result; r.resp != nil {
|
||||
testHookDidBodyClose()
|
||||
r.resp.Body.Close()
|
||||
}
|
||||
}()
|
||||
return nil, ctx.Err()
|
||||
case r := <-result:
|
||||
var err error
|
||||
resp, err = r.resp, r.err
|
||||
if err != nil {
|
||||
return resp, err
|
||||
}
|
||||
}
|
||||
|
||||
c := make(chan struct{})
|
||||
go func() {
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
close(cancel)
|
||||
case <-c:
|
||||
// The response's Body is closed.
|
||||
}
|
||||
}()
|
||||
resp.Body = ¬ifyingReader{resp.Body, c}
|
||||
|
||||
return resp, nil
|
||||
}
|
||||
|
||||
// Get issues a GET request via the Do function.
|
||||
func Get(ctx context.Context, client *http.Client, url string) (*http.Response, error) {
|
||||
req, err := http.NewRequest("GET", url, nil)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return Do(ctx, client, req)
|
||||
}
|
||||
|
||||
// Head issues a HEAD request via the Do function.
|
||||
func Head(ctx context.Context, client *http.Client, url string) (*http.Response, error) {
|
||||
req, err := http.NewRequest("HEAD", url, nil)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return Do(ctx, client, req)
|
||||
}
|
||||
|
||||
// Post issues a POST request via the Do function.
|
||||
func Post(ctx context.Context, client *http.Client, url string, bodyType string, body io.Reader) (*http.Response, error) {
|
||||
req, err := http.NewRequest("POST", url, body)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
req.Header.Set("Content-Type", bodyType)
|
||||
return Do(ctx, client, req)
|
||||
}
|
||||
|
||||
// PostForm issues a POST request via the Do function.
|
||||
func PostForm(ctx context.Context, client *http.Client, url string, data url.Values) (*http.Response, error) {
|
||||
return Post(ctx, client, url, "application/x-www-form-urlencoded", strings.NewReader(data.Encode()))
|
||||
}
|
||||
|
||||
// notifyingReader is an io.ReadCloser that closes the notify channel after
|
||||
// Close is called or a Read fails on the underlying ReadCloser.
|
||||
type notifyingReader struct {
|
||||
io.ReadCloser
|
||||
notify chan<- struct{}
|
||||
}
|
||||
|
||||
func (r *notifyingReader) Read(p []byte) (int, error) {
|
||||
n, err := r.ReadCloser.Read(p)
|
||||
if err != nil && r.notify != nil {
|
||||
close(r.notify)
|
||||
r.notify = nil
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
|
||||
func (r *notifyingReader) Close() error {
|
||||
err := r.ReadCloser.Close()
|
||||
if r.notify != nil {
|
||||
close(r.notify)
|
||||
r.notify = nil
|
||||
}
|
||||
return err
|
||||
}
|
||||
79
vendor/src/golang.org/x/net/context/ctxhttp/ctxhttp_pre17_test.go
vendored
Normal file
79
vendor/src/golang.org/x/net/context/ctxhttp/ctxhttp_pre17_test.go
vendored
Normal file
|
|
@ -0,0 +1,79 @@
|
|||
// Copyright 2015 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.
|
||||
|
||||
// +build !plan9,!go1.7
|
||||
|
||||
package ctxhttp
|
||||
|
||||
import (
|
||||
"net"
|
||||
"net/http"
|
||||
"net/http/httptest"
|
||||
"sync"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"golang.org/x/net/context"
|
||||
)
|
||||
|
||||
// golang.org/issue/14065
|
||||
func TestClosesResponseBodyOnCancel(t *testing.T) {
|
||||
defer func() { testHookContextDoneBeforeHeaders = nop }()
|
||||
defer func() { testHookDoReturned = nop }()
|
||||
defer func() { testHookDidBodyClose = nop }()
|
||||
|
||||
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
|
||||
defer ts.Close()
|
||||
|
||||
ctx, cancel := context.WithCancel(context.Background())
|
||||
|
||||
// closed when Do enters select case <-ctx.Done()
|
||||
enteredDonePath := make(chan struct{})
|
||||
|
||||
testHookContextDoneBeforeHeaders = func() {
|
||||
close(enteredDonePath)
|
||||
}
|
||||
|
||||
testHookDoReturned = func() {
|
||||
// We now have the result (the Flush'd headers) at least,
|
||||
// so we can cancel the request.
|
||||
cancel()
|
||||
|
||||
// But block the client.Do goroutine from sending
|
||||
// until Do enters into the <-ctx.Done() path, since
|
||||
// otherwise if both channels are readable, select
|
||||
// picks a random one.
|
||||
<-enteredDonePath
|
||||
}
|
||||
|
||||
sawBodyClose := make(chan struct{})
|
||||
testHookDidBodyClose = func() { close(sawBodyClose) }
|
||||
|
||||
tr := &http.Transport{}
|
||||
defer tr.CloseIdleConnections()
|
||||
c := &http.Client{Transport: tr}
|
||||
req, _ := http.NewRequest("GET", ts.URL, nil)
|
||||
_, doErr := Do(ctx, c, req)
|
||||
|
||||
select {
|
||||
case <-sawBodyClose:
|
||||
case <-time.After(5 * time.Second):
|
||||
t.Fatal("timeout waiting for body to close")
|
||||
}
|
||||
|
||||
if doErr != ctx.Err() {
|
||||
t.Errorf("Do error = %v; want %v", doErr, ctx.Err())
|
||||
}
|
||||
}
|
||||
|
||||
type noteCloseConn struct {
|
||||
net.Conn
|
||||
onceClose sync.Once
|
||||
closefn func()
|
||||
}
|
||||
|
||||
func (c *noteCloseConn) Close() error {
|
||||
c.onceClose.Do(c.closefn)
|
||||
return c.Conn.Close()
|
||||
}
|
||||
|
|
@ -2,9 +2,12 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build !plan9
|
||||
|
||||
package ctxhttp
|
||||
|
||||
import (
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"net/http"
|
||||
"net/http/httptest"
|
||||
|
|
@ -19,54 +22,84 @@ const (
|
|||
requestBody = "ok"
|
||||
)
|
||||
|
||||
func okHandler(w http.ResponseWriter, r *http.Request) {
|
||||
time.Sleep(requestDuration)
|
||||
io.WriteString(w, requestBody)
|
||||
}
|
||||
|
||||
func TestNoTimeout(t *testing.T) {
|
||||
ts := httptest.NewServer(http.HandlerFunc(okHandler))
|
||||
defer ts.Close()
|
||||
|
||||
ctx := context.Background()
|
||||
resp, err := doRequest(ctx)
|
||||
|
||||
if resp == nil || err != nil {
|
||||
t.Fatalf("error received from client: %v %v", err, resp)
|
||||
res, err := Get(ctx, nil, ts.URL)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
defer res.Body.Close()
|
||||
slurp, err := ioutil.ReadAll(res.Body)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if string(slurp) != requestBody {
|
||||
t.Errorf("body = %q; want %q", slurp, requestBody)
|
||||
}
|
||||
}
|
||||
func TestCancel(t *testing.T) {
|
||||
|
||||
func TestCancelBeforeHeaders(t *testing.T) {
|
||||
ctx, cancel := context.WithCancel(context.Background())
|
||||
go func() {
|
||||
time.Sleep(requestDuration / 2)
|
||||
|
||||
blockServer := make(chan struct{})
|
||||
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
cancel()
|
||||
}()
|
||||
<-blockServer
|
||||
io.WriteString(w, requestBody)
|
||||
}))
|
||||
defer ts.Close()
|
||||
defer close(blockServer)
|
||||
|
||||
resp, err := doRequest(ctx)
|
||||
|
||||
if resp != nil || err == nil {
|
||||
t.Fatalf("expected error, didn't get one. resp: %v", resp)
|
||||
res, err := Get(ctx, nil, ts.URL)
|
||||
if err == nil {
|
||||
res.Body.Close()
|
||||
t.Fatal("Get returned unexpected nil error")
|
||||
}
|
||||
if err != ctx.Err() {
|
||||
t.Fatalf("expected error from context but got: %v", err)
|
||||
if err != context.Canceled {
|
||||
t.Errorf("err = %v; want %v", err, context.Canceled)
|
||||
}
|
||||
}
|
||||
|
||||
func TestCancelAfterRequest(t *testing.T) {
|
||||
func TestCancelAfterHangingRequest(t *testing.T) {
|
||||
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
w.WriteHeader(http.StatusOK)
|
||||
w.(http.Flusher).Flush()
|
||||
<-w.(http.CloseNotifier).CloseNotify()
|
||||
}))
|
||||
defer ts.Close()
|
||||
|
||||
ctx, cancel := context.WithCancel(context.Background())
|
||||
resp, err := Get(ctx, nil, ts.URL)
|
||||
if err != nil {
|
||||
t.Fatalf("unexpected error in Get: %v", err)
|
||||
}
|
||||
|
||||
resp, err := doRequest(ctx)
|
||||
|
||||
// Cancel before reading the body.
|
||||
// Request.Body should still be readable after the context is canceled.
|
||||
// Cancel befer reading the body.
|
||||
// Reading Request.Body should fail, since the request was
|
||||
// canceled before anything was written.
|
||||
cancel()
|
||||
|
||||
b, err := ioutil.ReadAll(resp.Body)
|
||||
if err != nil || string(b) != requestBody {
|
||||
t.Fatalf("could not read body: %q %v", b, err)
|
||||
done := make(chan struct{})
|
||||
|
||||
go func() {
|
||||
b, err := ioutil.ReadAll(resp.Body)
|
||||
if len(b) != 0 || err == nil {
|
||||
t.Errorf(`Read got (%q, %v); want ("", error)`, b, err)
|
||||
}
|
||||
close(done)
|
||||
}()
|
||||
|
||||
select {
|
||||
case <-time.After(1 * time.Second):
|
||||
t.Errorf("Test timed out")
|
||||
case <-done:
|
||||
}
|
||||
}
|
||||
|
||||
func doRequest(ctx context.Context) (*http.Response, error) {
|
||||
var okHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
time.Sleep(requestDuration)
|
||||
w.Write([]byte(requestBody))
|
||||
})
|
||||
|
||||
serv := httptest.NewServer(okHandler)
|
||||
defer serv.Close()
|
||||
|
||||
return Get(ctx, nil, serv.URL)
|
||||
}
|
||||
|
|
|
|||
72
vendor/src/golang.org/x/net/context/go17.go
vendored
Normal file
72
vendor/src/golang.org/x/net/context/go17.go
vendored
Normal file
|
|
@ -0,0 +1,72 @@
|
|||
// Copyright 2016 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.
|
||||
|
||||
// +build go1.7
|
||||
|
||||
package context
|
||||
|
||||
import (
|
||||
"context" // standard library's context, as of Go 1.7
|
||||
"time"
|
||||
)
|
||||
|
||||
var (
|
||||
todo = context.TODO()
|
||||
background = context.Background()
|
||||
)
|
||||
|
||||
// Canceled is the error returned by Context.Err when the context is canceled.
|
||||
var Canceled = context.Canceled
|
||||
|
||||
// DeadlineExceeded is the error returned by Context.Err when the context's
|
||||
// deadline passes.
|
||||
var DeadlineExceeded = context.DeadlineExceeded
|
||||
|
||||
// WithCancel returns a copy of parent with a new Done channel. The returned
|
||||
// context's Done channel is closed when the returned cancel function is called
|
||||
// or when the parent context's Done channel is closed, whichever happens first.
|
||||
//
|
||||
// Canceling this context releases resources associated with it, so code should
|
||||
// call cancel as soon as the operations running in this Context complete.
|
||||
func WithCancel(parent Context) (ctx Context, cancel CancelFunc) {
|
||||
ctx, f := context.WithCancel(parent)
|
||||
return ctx, CancelFunc(f)
|
||||
}
|
||||
|
||||
// WithDeadline returns a copy of the parent context with the deadline adjusted
|
||||
// to be no later than d. If the parent's deadline is already earlier than d,
|
||||
// WithDeadline(parent, d) is semantically equivalent to parent. The returned
|
||||
// context's Done channel is closed when the deadline expires, when the returned
|
||||
// cancel function is called, or when the parent context's Done channel is
|
||||
// closed, whichever happens first.
|
||||
//
|
||||
// Canceling this context releases resources associated with it, so code should
|
||||
// call cancel as soon as the operations running in this Context complete.
|
||||
func WithDeadline(parent Context, deadline time.Time) (Context, CancelFunc) {
|
||||
ctx, f := context.WithDeadline(parent, deadline)
|
||||
return ctx, CancelFunc(f)
|
||||
}
|
||||
|
||||
// WithTimeout returns WithDeadline(parent, time.Now().Add(timeout)).
|
||||
//
|
||||
// Canceling this context releases resources associated with it, so code should
|
||||
// call cancel as soon as the operations running in this Context complete:
|
||||
//
|
||||
// func slowOperationWithTimeout(ctx context.Context) (Result, error) {
|
||||
// ctx, cancel := context.WithTimeout(ctx, 100*time.Millisecond)
|
||||
// defer cancel() // releases resources if slowOperation completes before timeout elapses
|
||||
// return slowOperation(ctx)
|
||||
// }
|
||||
func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc) {
|
||||
return WithDeadline(parent, time.Now().Add(timeout))
|
||||
}
|
||||
|
||||
// WithValue returns a copy of parent in which the value associated with key is
|
||||
// val.
|
||||
//
|
||||
// Use context Values only for request-scoped data that transits processes and
|
||||
// APIs, not for passing optional parameters to functions.
|
||||
func WithValue(parent Context, key interface{}, val interface{}) Context {
|
||||
return context.WithValue(parent, key, val)
|
||||
}
|
||||
300
vendor/src/golang.org/x/net/context/pre_go17.go
vendored
Normal file
300
vendor/src/golang.org/x/net/context/pre_go17.go
vendored
Normal file
|
|
@ -0,0 +1,300 @@
|
|||
// Copyright 2014 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.
|
||||
|
||||
// +build !go1.7
|
||||
|
||||
package context
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"sync"
|
||||
"time"
|
||||
)
|
||||
|
||||
// An emptyCtx is never canceled, has no values, and has no deadline. It is not
|
||||
// struct{}, since vars of this type must have distinct addresses.
|
||||
type emptyCtx int
|
||||
|
||||
func (*emptyCtx) Deadline() (deadline time.Time, ok bool) {
|
||||
return
|
||||
}
|
||||
|
||||
func (*emptyCtx) Done() <-chan struct{} {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (*emptyCtx) Err() error {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (*emptyCtx) Value(key interface{}) interface{} {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (e *emptyCtx) String() string {
|
||||
switch e {
|
||||
case background:
|
||||
return "context.Background"
|
||||
case todo:
|
||||
return "context.TODO"
|
||||
}
|
||||
return "unknown empty Context"
|
||||
}
|
||||
|
||||
var (
|
||||
background = new(emptyCtx)
|
||||
todo = new(emptyCtx)
|
||||
)
|
||||
|
||||
// Canceled is the error returned by Context.Err when the context is canceled.
|
||||
var Canceled = errors.New("context canceled")
|
||||
|
||||
// DeadlineExceeded is the error returned by Context.Err when the context's
|
||||
// deadline passes.
|
||||
var DeadlineExceeded = errors.New("context deadline exceeded")
|
||||
|
||||
// WithCancel returns a copy of parent with a new Done channel. The returned
|
||||
// context's Done channel is closed when the returned cancel function is called
|
||||
// or when the parent context's Done channel is closed, whichever happens first.
|
||||
//
|
||||
// Canceling this context releases resources associated with it, so code should
|
||||
// call cancel as soon as the operations running in this Context complete.
|
||||
func WithCancel(parent Context) (ctx Context, cancel CancelFunc) {
|
||||
c := newCancelCtx(parent)
|
||||
propagateCancel(parent, c)
|
||||
return c, func() { c.cancel(true, Canceled) }
|
||||
}
|
||||
|
||||
// newCancelCtx returns an initialized cancelCtx.
|
||||
func newCancelCtx(parent Context) *cancelCtx {
|
||||
return &cancelCtx{
|
||||
Context: parent,
|
||||
done: make(chan struct{}),
|
||||
}
|
||||
}
|
||||
|
||||
// propagateCancel arranges for child to be canceled when parent is.
|
||||
func propagateCancel(parent Context, child canceler) {
|
||||
if parent.Done() == nil {
|
||||
return // parent is never canceled
|
||||
}
|
||||
if p, ok := parentCancelCtx(parent); ok {
|
||||
p.mu.Lock()
|
||||
if p.err != nil {
|
||||
// parent has already been canceled
|
||||
child.cancel(false, p.err)
|
||||
} else {
|
||||
if p.children == nil {
|
||||
p.children = make(map[canceler]bool)
|
||||
}
|
||||
p.children[child] = true
|
||||
}
|
||||
p.mu.Unlock()
|
||||
} else {
|
||||
go func() {
|
||||
select {
|
||||
case <-parent.Done():
|
||||
child.cancel(false, parent.Err())
|
||||
case <-child.Done():
|
||||
}
|
||||
}()
|
||||
}
|
||||
}
|
||||
|
||||
// parentCancelCtx follows a chain of parent references until it finds a
|
||||
// *cancelCtx. This function understands how each of the concrete types in this
|
||||
// package represents its parent.
|
||||
func parentCancelCtx(parent Context) (*cancelCtx, bool) {
|
||||
for {
|
||||
switch c := parent.(type) {
|
||||
case *cancelCtx:
|
||||
return c, true
|
||||
case *timerCtx:
|
||||
return c.cancelCtx, true
|
||||
case *valueCtx:
|
||||
parent = c.Context
|
||||
default:
|
||||
return nil, false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// removeChild removes a context from its parent.
|
||||
func removeChild(parent Context, child canceler) {
|
||||
p, ok := parentCancelCtx(parent)
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
p.mu.Lock()
|
||||
if p.children != nil {
|
||||
delete(p.children, child)
|
||||
}
|
||||
p.mu.Unlock()
|
||||
}
|
||||
|
||||
// A canceler is a context type that can be canceled directly. The
|
||||
// implementations are *cancelCtx and *timerCtx.
|
||||
type canceler interface {
|
||||
cancel(removeFromParent bool, err error)
|
||||
Done() <-chan struct{}
|
||||
}
|
||||
|
||||
// A cancelCtx can be canceled. When canceled, it also cancels any children
|
||||
// that implement canceler.
|
||||
type cancelCtx struct {
|
||||
Context
|
||||
|
||||
done chan struct{} // closed by the first cancel call.
|
||||
|
||||
mu sync.Mutex
|
||||
children map[canceler]bool // set to nil by the first cancel call
|
||||
err error // set to non-nil by the first cancel call
|
||||
}
|
||||
|
||||
func (c *cancelCtx) Done() <-chan struct{} {
|
||||
return c.done
|
||||
}
|
||||
|
||||
func (c *cancelCtx) Err() error {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
return c.err
|
||||
}
|
||||
|
||||
func (c *cancelCtx) String() string {
|
||||
return fmt.Sprintf("%v.WithCancel", c.Context)
|
||||
}
|
||||
|
||||
// cancel closes c.done, cancels each of c's children, and, if
|
||||
// removeFromParent is true, removes c from its parent's children.
|
||||
func (c *cancelCtx) cancel(removeFromParent bool, err error) {
|
||||
if err == nil {
|
||||
panic("context: internal error: missing cancel error")
|
||||
}
|
||||
c.mu.Lock()
|
||||
if c.err != nil {
|
||||
c.mu.Unlock()
|
||||
return // already canceled
|
||||
}
|
||||
c.err = err
|
||||
close(c.done)
|
||||
for child := range c.children {
|
||||
// NOTE: acquiring the child's lock while holding parent's lock.
|
||||
child.cancel(false, err)
|
||||
}
|
||||
c.children = nil
|
||||
c.mu.Unlock()
|
||||
|
||||
if removeFromParent {
|
||||
removeChild(c.Context, c)
|
||||
}
|
||||
}
|
||||
|
||||
// WithDeadline returns a copy of the parent context with the deadline adjusted
|
||||
// to be no later than d. If the parent's deadline is already earlier than d,
|
||||
// WithDeadline(parent, d) is semantically equivalent to parent. The returned
|
||||
// context's Done channel is closed when the deadline expires, when the returned
|
||||
// cancel function is called, or when the parent context's Done channel is
|
||||
// closed, whichever happens first.
|
||||
//
|
||||
// Canceling this context releases resources associated with it, so code should
|
||||
// call cancel as soon as the operations running in this Context complete.
|
||||
func WithDeadline(parent Context, deadline time.Time) (Context, CancelFunc) {
|
||||
if cur, ok := parent.Deadline(); ok && cur.Before(deadline) {
|
||||
// The current deadline is already sooner than the new one.
|
||||
return WithCancel(parent)
|
||||
}
|
||||
c := &timerCtx{
|
||||
cancelCtx: newCancelCtx(parent),
|
||||
deadline: deadline,
|
||||
}
|
||||
propagateCancel(parent, c)
|
||||
d := deadline.Sub(time.Now())
|
||||
if d <= 0 {
|
||||
c.cancel(true, DeadlineExceeded) // deadline has already passed
|
||||
return c, func() { c.cancel(true, Canceled) }
|
||||
}
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
if c.err == nil {
|
||||
c.timer = time.AfterFunc(d, func() {
|
||||
c.cancel(true, DeadlineExceeded)
|
||||
})
|
||||
}
|
||||
return c, func() { c.cancel(true, Canceled) }
|
||||
}
|
||||
|
||||
// A timerCtx carries a timer and a deadline. It embeds a cancelCtx to
|
||||
// implement Done and Err. It implements cancel by stopping its timer then
|
||||
// delegating to cancelCtx.cancel.
|
||||
type timerCtx struct {
|
||||
*cancelCtx
|
||||
timer *time.Timer // Under cancelCtx.mu.
|
||||
|
||||
deadline time.Time
|
||||
}
|
||||
|
||||
func (c *timerCtx) Deadline() (deadline time.Time, ok bool) {
|
||||
return c.deadline, true
|
||||
}
|
||||
|
||||
func (c *timerCtx) String() string {
|
||||
return fmt.Sprintf("%v.WithDeadline(%s [%s])", c.cancelCtx.Context, c.deadline, c.deadline.Sub(time.Now()))
|
||||
}
|
||||
|
||||
func (c *timerCtx) cancel(removeFromParent bool, err error) {
|
||||
c.cancelCtx.cancel(false, err)
|
||||
if removeFromParent {
|
||||
// Remove this timerCtx from its parent cancelCtx's children.
|
||||
removeChild(c.cancelCtx.Context, c)
|
||||
}
|
||||
c.mu.Lock()
|
||||
if c.timer != nil {
|
||||
c.timer.Stop()
|
||||
c.timer = nil
|
||||
}
|
||||
c.mu.Unlock()
|
||||
}
|
||||
|
||||
// WithTimeout returns WithDeadline(parent, time.Now().Add(timeout)).
|
||||
//
|
||||
// Canceling this context releases resources associated with it, so code should
|
||||
// call cancel as soon as the operations running in this Context complete:
|
||||
//
|
||||
// func slowOperationWithTimeout(ctx context.Context) (Result, error) {
|
||||
// ctx, cancel := context.WithTimeout(ctx, 100*time.Millisecond)
|
||||
// defer cancel() // releases resources if slowOperation completes before timeout elapses
|
||||
// return slowOperation(ctx)
|
||||
// }
|
||||
func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc) {
|
||||
return WithDeadline(parent, time.Now().Add(timeout))
|
||||
}
|
||||
|
||||
// WithValue returns a copy of parent in which the value associated with key is
|
||||
// val.
|
||||
//
|
||||
// Use context Values only for request-scoped data that transits processes and
|
||||
// APIs, not for passing optional parameters to functions.
|
||||
func WithValue(parent Context, key interface{}, val interface{}) Context {
|
||||
return &valueCtx{parent, key, val}
|
||||
}
|
||||
|
||||
// A valueCtx carries a key-value pair. It implements Value for that key and
|
||||
// delegates all other calls to the embedded Context.
|
||||
type valueCtx struct {
|
||||
Context
|
||||
key, val interface{}
|
||||
}
|
||||
|
||||
func (c *valueCtx) String() string {
|
||||
return fmt.Sprintf("%v.WithValue(%#v, %#v)", c.Context, c.key, c.val)
|
||||
}
|
||||
|
||||
func (c *valueCtx) Value(key interface{}) interface{} {
|
||||
if c.key == key {
|
||||
return c.val
|
||||
}
|
||||
return c.Context.Value(key)
|
||||
}
|
||||
Loading…
Reference in a new issue