forked from ipfs/kubo
/
context.go
82 lines (76 loc) · 2.06 KB
/
context.go
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package goprocessctx
import (
goprocess "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/jbenet/goprocess"
context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
)
// WithContext constructs and returns a Process that respects
// given context. It is the equivalent of:
//
// func ProcessWithContext(ctx context.Context) goprocess.Process {
// p := goprocess.WithParent(goprocess.Background())
// go func() {
// <-ctx.Done()
// p.Close()
// }()
// return p
// }
//
func WithContext(ctx context.Context) goprocess.Process {
if ctx == nil {
panic("nil Context")
}
p := goprocess.WithParent(goprocess.Background())
go func() {
<-ctx.Done()
p.Close()
}()
return p
}
// WaitForContext makes p WaitFor ctx. When Closing, p waits for
// ctx.Done(), before being Closed(). It is simply:
//
// p.WaitFor(goprocess.WithContext(ctx))
//
func WaitForContext(ctx context.Context, p goprocess.Process) {
p.WaitFor(WithContext(ctx))
}
// WithProcessClosing returns a context.Context derived from ctx that
// is cancelled as p is Closing (after: <-p.Closing()). It is simply:
//
// func WithProcessClosing(ctx context.Context, p goprocess.Process) context.Context {
// ctx, cancel := context.WithCancel(ctx)
// go func() {
// <-p.Closing()
// cancel()
// }()
// return ctx
// }
//
func WithProcessClosing(ctx context.Context, p goprocess.Process) context.Context {
ctx, cancel := context.WithCancel(ctx)
go func() {
<-p.Closing()
cancel()
}()
return ctx
}
// WithProcessClosed returns a context.Context that is cancelled
// after Process p is Closed. It is the equivalent of:
//
// func WithProcessClosed(ctx context.Context, p goprocess.Process) context.Context {
// ctx, cancel := context.WithCancel(ctx)
// go func() {
// <-p.Closed()
// cancel()
// }()
// return ctx
// }
//
func WithProcessClosed(ctx context.Context, p goprocess.Process) context.Context {
ctx, cancel := context.WithCancel(ctx)
go func() {
<-p.Closed()
cancel()
}()
return ctx
}