Курнат Андрей
116 lines
2.9 KiB
Go
116 lines
2.9 KiB
Go
package wait
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import (
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"context"
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"errors"
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"fmt"
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"reflect"
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"strings"
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"time"
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)
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// Implement interface
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var (
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_ Strategy = (*MultiStrategy)(nil)
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_ StrategyTimeout = (*MultiStrategy)(nil)
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)
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type MultiStrategy struct {
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// all Strategies should have a startupTimeout to avoid waiting infinitely
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timeout *time.Duration
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deadline *time.Duration
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// additional properties
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Strategies []Strategy
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}
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// WithStartupTimeoutDefault sets the default timeout for all inner wait strategies
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func (ms *MultiStrategy) WithStartupTimeoutDefault(timeout time.Duration) *MultiStrategy {
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ms.timeout = &timeout
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return ms
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}
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// WithStartupTimeout sets a time.Duration which limits all wait strategies
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//
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// Deprecated: use WithDeadline
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func (ms *MultiStrategy) WithStartupTimeout(timeout time.Duration) Strategy {
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return ms.WithDeadline(timeout)
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}
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// WithDeadline sets a time.Duration which limits all wait strategies
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func (ms *MultiStrategy) WithDeadline(deadline time.Duration) *MultiStrategy {
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ms.deadline = &deadline
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return ms
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}
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func ForAll(strategies ...Strategy) *MultiStrategy {
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return &MultiStrategy{
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Strategies: strategies,
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}
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}
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func (ms *MultiStrategy) Timeout() *time.Duration {
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return ms.timeout
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}
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// String returns a human-readable description of the wait strategy.
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func (ms *MultiStrategy) String() string {
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if len(ms.Strategies) == 0 {
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return "all of: (none)"
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}
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var strategies []string
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for _, strategy := range ms.Strategies {
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if strategy == nil || reflect.ValueOf(strategy).IsNil() {
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continue
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}
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if s, ok := strategy.(fmt.Stringer); ok {
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strategies = append(strategies, s.String())
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} else {
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strategies = append(strategies, fmt.Sprintf("%T", strategy))
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}
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}
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// Always include "all of:" prefix to make it clear this is a MultiStrategy
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// even when there's only one strategy after filtering out nils
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return "all of: [" + strings.Join(strategies, ", ") + "]"
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}
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func (ms *MultiStrategy) WaitUntilReady(ctx context.Context, target StrategyTarget) error {
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var cancel context.CancelFunc
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if ms.deadline != nil {
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ctx, cancel = context.WithTimeout(ctx, *ms.deadline)
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defer cancel()
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}
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if len(ms.Strategies) == 0 {
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return errors.New("no wait strategy supplied")
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}
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for _, strategy := range ms.Strategies {
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if strategy == nil || reflect.ValueOf(strategy).IsNil() {
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// A module could be appending strategies after part of the container initialization,
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// and use wait.ForAll on a not initialized strategy.
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// In this case, we just skip the nil strategy.
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continue
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}
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strategyCtx := ctx
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// Set default Timeout when strategy implements StrategyTimeout
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if st, ok := strategy.(StrategyTimeout); ok {
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if ms.Timeout() != nil && st.Timeout() == nil {
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strategyCtx, cancel = context.WithTimeout(ctx, *ms.Timeout())
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defer cancel()
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}
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}
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err := strategy.WaitUntilReady(strategyCtx, target)
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if err != nil {
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return err
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}
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}
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return nil
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}
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