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future.go
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future.go
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package raft
import "context"
type deferError struct {
errCh chan error
}
func (d *deferError) init() {
d.errCh = make(chan error, 1)
}
func (d *deferError) respond(err error) {
d.errCh <- err
close(d.errCh)
}
func (d *deferError) error() <-chan error {
return d.errCh
}
type Future struct {
deferError
ctx context.Context
respCh chan interface{}
}
func newFuture(ctx context.Context) *Future {
f := &Future{
ctx: ctx,
respCh: make(chan interface{}, 1),
}
f.init()
return f
}
func (f *Future) respond(resp interface{}, err error) {
f.deferError.respond(err)
if err == nil {
f.respCh <- resp
}
close(f.respCh)
}
func (f *Future) Response() (resp interface{}, err error) {
// wait error
select {
case err = <-f.error():
case <-f.ctx.Done():
return nil, ErrCanceled
}
if err != nil {
return
}
// wait resp
select {
case resp = <-f.respCh:
return
case <-f.ctx.Done():
return nil, ErrCanceled
}
}