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