92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
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package wait
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import (
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"context"
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"time"
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"github.com/docker/docker/api/types"
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)
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// Implement interface
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var _ Strategy = (*HealthStrategy)(nil)
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var _ StrategyTimeout = (*HealthStrategy)(nil)
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// HealthStrategy will wait until the container becomes healthy
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type HealthStrategy 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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// additional properties
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PollInterval time.Duration
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}
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// NewHealthStrategy constructs with polling interval of 100 milliseconds and startup timeout of 60 seconds by default
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func NewHealthStrategy() *HealthStrategy {
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return &HealthStrategy{
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PollInterval: defaultPollInterval(),
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}
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}
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// fluent builders for each property
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// since go has neither covariance nor generics, the return type must be the type of the concrete implementation
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// this is true for all properties, even the "shared" ones like startupTimeout
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// WithStartupTimeout can be used to change the default startup timeout
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func (ws *HealthStrategy) WithStartupTimeout(startupTimeout time.Duration) *HealthStrategy {
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ws.timeout = &startupTimeout
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return ws
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}
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// WithPollInterval can be used to override the default polling interval of 100 milliseconds
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func (ws *HealthStrategy) WithPollInterval(pollInterval time.Duration) *HealthStrategy {
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ws.PollInterval = pollInterval
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return ws
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}
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// ForHealthCheck is the default construction for the fluid interface.
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//
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// For Example:
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//
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// wait.
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// ForHealthCheck().
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// WithPollInterval(1 * time.Second)
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func ForHealthCheck() *HealthStrategy {
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return NewHealthStrategy()
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}
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func (ws *HealthStrategy) Timeout() *time.Duration {
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return ws.timeout
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}
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// WaitUntilReady implements Strategy.WaitUntilReady
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func (ws *HealthStrategy) WaitUntilReady(ctx context.Context, target StrategyTarget) (err error) {
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timeout := defaultStartupTimeout()
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if ws.timeout != nil {
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timeout = *ws.timeout
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}
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ctx, cancel := context.WithTimeout(ctx, timeout)
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defer cancel()
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for {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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state, err := target.State(ctx)
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if err != nil {
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return err
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}
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if err := checkState(state); err != nil {
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return err
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}
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if state.Health == nil || state.Health.Status != types.Healthy {
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time.Sleep(ws.PollInterval)
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continue
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}
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return nil
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}
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}
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}
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