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package wait
import (
"context"
"fmt"
"io"
"time"
"github.com/containerd/errdefs"
)
var (
_ Strategy = (*FileStrategy)(nil)
_ StrategyTimeout = (*FileStrategy)(nil)
)
// FileStrategy waits for a file to exist in the container.
type FileStrategy struct {
timeout *time.Duration
file string
pollInterval time.Duration
matcher func(io.Reader) error
}
// NewFileStrategy constructs an FileStrategy strategy.
func NewFileStrategy(file string) *FileStrategy {
return &FileStrategy{
file: file,
pollInterval: defaultPollInterval(),
}
}
// WithStartupTimeout can be used to change the default startup timeout
func (ws *FileStrategy) WithStartupTimeout(startupTimeout time.Duration) *FileStrategy {
ws.timeout = &startupTimeout
return ws
}
// WithPollInterval can be used to override the default polling interval of 100 milliseconds
func (ws *FileStrategy) WithPollInterval(pollInterval time.Duration) *FileStrategy {
ws.pollInterval = pollInterval
return ws
}
// WithMatcher can be used to consume the file content.
// The matcher can return an errdefs.ErrNotFound to indicate that the file is not ready.
// Any other error will be considered a failure.
// Default: nil, will only wait for the file to exist.
func (ws *FileStrategy) WithMatcher(matcher func(io.Reader) error) *FileStrategy {
ws.matcher = matcher
return ws
}
// ForFile is a convenience method to assign FileStrategy
func ForFile(file string) *FileStrategy {
return NewFileStrategy(file)
}
// Timeout returns the timeout for the strategy
func (ws *FileStrategy) Timeout() *time.Duration {
return ws.timeout
}
// WaitUntilReady waits until the file exists in the container and copies it to the target.
func (ws *FileStrategy) WaitUntilReady(ctx context.Context, target StrategyTarget) error {
timeout := defaultStartupTimeout()
if ws.timeout != nil {
timeout = *ws.timeout
}
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
timer := time.NewTicker(ws.pollInterval)
defer timer.Stop()
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-timer.C:
if err := ws.matchFile(ctx, target); err != nil {
if errdefs.IsNotFound(err) {
// Not found, continue polling.
continue
}
return fmt.Errorf("copy from container: %w", err)
}
return nil
}
}
}
// matchFile tries to copy the file from the container and match it.
func (ws *FileStrategy) matchFile(ctx context.Context, target StrategyTarget) error {
rc, err := target.CopyFileFromContainer(ctx, ws.file)
if err != nil {
return fmt.Errorf("copy from container: %w", err)
}
defer rc.Close()
if ws.matcher == nil {
// No matcher, just check if the file exists.
return nil
}
if err = ws.matcher(rc); err != nil {
return fmt.Errorf("matcher: %w", err)
}
return nil
}
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