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poll.go
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poll.go
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package gojenkins
import (
"fmt"
"time"
)
// ConditionFunc returns true if the condition is satisfied, or an error
// if the loop should be aborted.
type ConditionFunc func() (done bool, err error)
// NewConditionFunc combines the functions into a single function that can be used when polling
func NewConditionFunc(functions ...ConditionFunc) ConditionFunc {
return func() (bool, error) {
for _, fn := range functions {
done, err := fn()
if done || err != nil {
return done, err
}
}
return false, nil
}
}
// Poll polls the given function until it returns true to indicate its complete or an error
func Poll(pollPeriod time.Duration, timeout time.Duration, timeoutFailureMessage string, fn ConditionFunc) error {
timeoutAt := time.Now().Add(timeout)
useTimeout := timeout.Nanoseconds() > 0
for {
ok, err := fn()
if err != nil {
return err
}
if ok {
return nil
}
if useTimeout && time.Now().After(timeoutAt) {
return fmt.Errorf("Timed out waiting for %s waited for %s", timeoutFailureMessage, timeout.String())
}
time.Sleep(pollPeriod)
}
}