105 lines
2.5 KiB
Go
105 lines
2.5 KiB
Go
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package wait
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import (
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"context"
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"io/ioutil"
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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 _ Strategy = (*LogStrategy)(nil)
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// LogStrategy will wait until a given log entry shows up in the docker logs
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type LogStrategy struct {
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// all Strategies should have a startupTimeout to avoid waiting infinitely
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startupTimeout time.Duration
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// additional properties
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Log string
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PollInterval time.Duration
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Occurrence int
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}
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// NewLogStrategy constructs a HTTP strategy waiting on port 80 and status code 200
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func NewLogStrategy(log string) *LogStrategy {
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return &LogStrategy{
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startupTimeout: defaultStartupTimeout(),
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Log: log,
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PollInterval: 100 * time.Millisecond,
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Occurrence: 1,
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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 *LogStrategy) WithStartupTimeout(startupTimeout time.Duration) *LogStrategy {
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ws.startupTimeout = 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 *LogStrategy) WithPollInterval(pollInterval time.Duration) *LogStrategy {
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ws.PollInterval = pollInterval
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return ws
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}
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func (ws *LogStrategy) WithOccurrence(o int) *LogStrategy {
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// the number of occurence needs to be positive
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if o <= 0 {
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o = 1
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}
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ws.Occurrence = o
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return ws
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}
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// ForLog is the default construction for the fluid interface.
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//
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// For Example:
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// wait.
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// ForLog("some text").
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// WithPollInterval(1 * time.Second)
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func ForLog(log string) *LogStrategy {
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return NewLogStrategy(log)
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}
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// WaitUntilReady implements Strategy.WaitUntilReady
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func (ws *LogStrategy) WaitUntilReady(ctx context.Context, target StrategyTarget) (err error) {
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// limit context to startupTimeout
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ctx, cancelContext := context.WithTimeout(ctx, ws.startupTimeout)
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defer cancelContext()
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currentOccurence := 0
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LOOP:
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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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reader, err := target.Logs(ctx)
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if err != nil {
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time.Sleep(ws.PollInterval)
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continue
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}
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b, err := ioutil.ReadAll(reader)
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logs := string(b)
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if strings.Contains(logs, ws.Log) {
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currentOccurence++
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if ws.Occurrence == 0 || currentOccurence >= ws.Occurrence-1 {
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break LOOP
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}
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} else {
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time.Sleep(ws.PollInterval)
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continue
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}
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}
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}
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return nil
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}
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