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72 lines
2.8 KiB
72 lines
2.8 KiB
// Copyright 2016 The Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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// +build go1.7 |
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package context |
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import ( |
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"context" // standard library's context, as of Go 1.7 |
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"time" |
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) |
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var ( |
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todo = context.TODO() |
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background = context.Background() |
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) |
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// Canceled is the error returned by Context.Err when the context is canceled. |
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var Canceled = context.Canceled |
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// DeadlineExceeded is the error returned by Context.Err when the context's |
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// deadline passes. |
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var DeadlineExceeded = context.DeadlineExceeded |
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// WithCancel returns a copy of parent with a new Done channel. The returned |
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// context's Done channel is closed when the returned cancel function is called |
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// or when the parent context's Done channel is closed, whichever happens first. |
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// |
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// Canceling this context releases resources associated with it, so code should |
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// call cancel as soon as the operations running in this Context complete. |
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func WithCancel(parent Context) (ctx Context, cancel CancelFunc) { |
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ctx, f := context.WithCancel(parent) |
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return ctx, CancelFunc(f) |
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} |
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// WithDeadline returns a copy of the parent context with the deadline adjusted |
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// to be no later than d. If the parent's deadline is already earlier than d, |
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// WithDeadline(parent, d) is semantically equivalent to parent. The returned |
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// context's Done channel is closed when the deadline expires, when the returned |
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// cancel function is called, or when the parent context's Done channel is |
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// closed, whichever happens first. |
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// |
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// Canceling this context releases resources associated with it, so code should |
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// call cancel as soon as the operations running in this Context complete. |
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func WithDeadline(parent Context, deadline time.Time) (Context, CancelFunc) { |
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ctx, f := context.WithDeadline(parent, deadline) |
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return ctx, CancelFunc(f) |
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} |
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// WithTimeout returns WithDeadline(parent, time.Now().Add(timeout)). |
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// |
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// Canceling this context releases resources associated with it, so code should |
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// call cancel as soon as the operations running in this Context complete: |
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// |
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// func slowOperationWithTimeout(ctx context.Context) (Result, error) { |
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// ctx, cancel := context.WithTimeout(ctx, 100*time.Millisecond) |
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// defer cancel() // releases resources if slowOperation completes before timeout elapses |
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// return slowOperation(ctx) |
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// } |
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func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc) { |
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return WithDeadline(parent, time.Now().Add(timeout)) |
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} |
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// WithValue returns a copy of parent in which the value associated with key is |
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// val. |
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// |
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// Use context Values only for request-scoped data that transits processes and |
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// APIs, not for passing optional parameters to functions. |
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func WithValue(parent Context, key interface{}, val interface{}) Context { |
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return context.WithValue(parent, key, val) |
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}
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