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