152bdee7f2
Compiles -- but xva create_instance is incomplete Several changes were rolled into this commit, including: - "export_format" is now "format", and "keep_instance" is "keep_vm" - gox is used for building (with the intention of allowing cross-compilation in the future)
87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
package common
|
|
|
|
import (
|
|
"github.com/mitchellh/multistep"
|
|
"time"
|
|
)
|
|
|
|
type InterruptibleWait struct {
|
|
Timeout time.Duration
|
|
|
|
// optional:
|
|
Predicate func() (result bool, err error)
|
|
PredicateInterval time.Duration
|
|
}
|
|
|
|
type TimeoutError struct{}
|
|
|
|
func (err TimeoutError) Error() string {
|
|
return "Timed out"
|
|
}
|
|
|
|
type InterruptedError struct{}
|
|
|
|
func (err InterruptedError) Error() string {
|
|
return "Interrupted"
|
|
}
|
|
|
|
type PredicateResult struct {
|
|
complete bool
|
|
err error
|
|
}
|
|
|
|
/* Wait waits for up to Timeout duration, checking an optional Predicate every PredicateInterval duration.
|
|
The first run of Predicate is immediately after Wait is called.
|
|
If the command is interrupted by the user, then an InterruptedError is returned.
|
|
If Predicate is not nil, a timeout leads to TimeoutError being returned, and a successful Predicate run leads to nil being returned.
|
|
If Predicate is nil, a timeout is not an error, and nil is returned.
|
|
*/
|
|
func (wait InterruptibleWait) Wait(state multistep.StateBag) error {
|
|
predicateResult := make(chan PredicateResult, 1)
|
|
stopWaiting := make(chan struct{})
|
|
defer close(stopWaiting)
|
|
|
|
if wait.Predicate != nil {
|
|
go func() {
|
|
for {
|
|
if complete, err := wait.Predicate(); err != nil || complete {
|
|
predicateResult <- PredicateResult{complete, err}
|
|
return
|
|
}
|
|
|
|
select {
|
|
case <-time.After(wait.PredicateInterval):
|
|
continue
|
|
case <-stopWaiting:
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
}
|
|
|
|
timeout := time.After(wait.Timeout)
|
|
for {
|
|
// wait for either install to complete/error,
|
|
// an interrupt to come through, or a timeout to occur
|
|
|
|
if _, ok := state.GetOk(multistep.StateCancelled); ok {
|
|
return InterruptedError{}
|
|
}
|
|
|
|
select {
|
|
case result := <-predicateResult:
|
|
return result.err
|
|
|
|
case <-time.After(1 * time.Second):
|
|
continue
|
|
|
|
case <-timeout:
|
|
if wait.Predicate != nil {
|
|
return TimeoutError{}
|
|
} else {
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
}
|