packer-cn/builder/oracle/oci/client/waiters.go

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package oci
import (
"fmt"
"time"
)
const (
defaultWaitDurationMS = 5000
defaultMaxRetries = 0
)
type Waiter struct {
WaitDurationMS int
MaxRetries int
}
type WaitableService interface {
GetResourceState(id string) (string, error)
}
func stringSliceContains(slice []string, value string) bool {
for _, elem := range slice {
if elem == value {
return true
}
}
return false
}
// NewWaiter creates a waiter with default wait duration and unlimited retry
// operations.
func NewWaiter() *Waiter {
return &Waiter{WaitDurationMS: defaultWaitDurationMS, MaxRetries: defaultMaxRetries}
}
// WaitForResourceToReachState polls a resource that implements WaitableService
// repeatedly until it reaches a known state or fails if it reaches an
// unexpected state. The duration of the interval and number of polls is
// determined by the Waiter configuration.
func (w *Waiter) WaitForResourceToReachState(svc WaitableService, id string, waitStates []string, terminalState string) error {
for i := 0; w.MaxRetries == 0 || i < w.MaxRetries; i++ {
state, err := svc.GetResourceState(id)
if err != nil {
return err
}
if stringSliceContains(waitStates, state) {
time.Sleep(time.Duration(w.WaitDurationMS) * time.Millisecond)
continue
} else if state == terminalState {
return nil
}
return fmt.Errorf("Unexpected resource state %s, expecting a waiting state %s or terminal state %s ", state, waitStates, terminalState)
}
return fmt.Errorf("Maximum number of retries (%d) exceeded; resource did not reach state %s", w.MaxRetries, terminalState)
}