vendor/github.com/aws/aws-sdk-go/aws/context_background_1_5.go

   1 // +build !go1.7
   2
   3 package aws
   4
   5 import "time"
   6
   7 // An emptyCtx is a copy of the Go 1.7 context.emptyCtx type. This is copied to
   8 // provide a 1.6 and 1.5 safe version of context that is compatible with Go
   9 // 1.7's Context.
  10 //
  11 // An emptyCtx is never canceled, has no values, and has no deadline. It is not
  12 // struct{}, since vars of this type must have distinct addresses.
  13 type emptyCtx int
  14
  15 func (*emptyCtx) Deadline() (deadline time.Time, ok bool) {
  16         return
  17 }
  18
  19 func (*emptyCtx) Done() <-chan struct{} {
  20         return nil
  21 }
  22
  23 func (*emptyCtx) Err() error {
  24         return nil
  25 }
  26
  27 func (*emptyCtx) Value(key interface{}) interface{} {
  28         return nil
  29 }
  30
  31 func (e *emptyCtx) String() string {
  32         switch e {
  33         case backgroundCtx:
  34                 return "aws.BackgroundContext"
  35         }
  36         return "unknown empty Context"
  37 }
  38
  39 var (
  40         backgroundCtx = new(emptyCtx)
  41 )
  42
  43 // BackgroundContext returns a context that will never be canceled, has no
  44 // values, and no deadline. This context is used by the SDK to provide
  45 // backwards compatibility with non-context API operations and functionality.
  46 //
  47 // Go 1.6 and before:
  48 // This context function is equivalent to context.Background in the Go stdlib.
  49 //
  50 // Go 1.7 and later:
  51 // The context returned will be the value returned by context.Background()
  52 //
  53 // See https://golang.org/pkg/context for more information on Contexts.
  54 func BackgroundContext() Context {
  55         return backgroundCtx
  56 }