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|
package wait
import (
"context"
"strings"
"time"
)
// Implement interface
var (
_ Strategy = (*ExitStrategy)(nil)
_ StrategyTimeout = (*ExitStrategy)(nil)
)
// ExitStrategy will wait until container exit
type ExitStrategy struct {
// all Strategies should have a timeout to avoid waiting infinitely
timeout *time.Duration
// additional properties
PollInterval time.Duration
}
// NewExitStrategy constructs with polling interval of 100 milliseconds without timeout by default
func NewExitStrategy() *ExitStrategy {
return &ExitStrategy{
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
// WithExitTimeout can be used to change the default exit timeout
func (ws *ExitStrategy) WithExitTimeout(exitTimeout time.Duration) *ExitStrategy {
ws.timeout = &exitTimeout
return ws
}
// WithPollInterval can be used to override the default polling interval of 100 milliseconds
func (ws *ExitStrategy) WithPollInterval(pollInterval time.Duration) *ExitStrategy {
ws.PollInterval = pollInterval
return ws
}
// ForExit is the default construction for the fluid interface.
//
// For Example:
//
// wait.
// ForExit().
// WithPollInterval(1 * time.Second)
func ForExit() *ExitStrategy {
return NewExitStrategy()
}
func (ws *ExitStrategy) Timeout() *time.Duration {
return ws.timeout
}
// WaitUntilReady implements Strategy.WaitUntilReady
func (ws *ExitStrategy) WaitUntilReady(ctx context.Context, target StrategyTarget) error {
if ws.timeout != nil {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, *ws.timeout)
defer cancel()
}
for {
select {
case <-ctx.Done():
return ctx.Err()
default:
state, err := target.State(ctx)
if err != nil {
if !strings.Contains(err.Error(), "No such container") {
return err
}
return nil
}
if state.Running {
time.Sleep(ws.PollInterval)
continue
}
return nil
}
}
}
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