mirror of https://github.com/hashicorp/consul
70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package subscribe
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import (
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"sync"
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"time"
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"github.com/hashicorp/go-uuid"
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"github.com/hashicorp/consul/agent/consul/stream"
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"github.com/hashicorp/consul/proto/pbsubscribe"
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)
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// streamID is used in logs as a unique identifier for a subscription. The value
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// is created lazily on the first call to String() so that we do not call it
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// if trace logging is disabled.
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// If a random UUID can not be created, defaults to the current time formatted
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// as RFC3339Nano.
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//
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// TODO(banks) it might be nice one day to replace this with OpenTracing ID
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// if one is set etc. but probably pointless until we support that properly
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// in other places so it's actually propagated properly. For now this just
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// makes lifetime of a stream more traceable in our regular server logs for
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// debugging/dev.
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type streamID struct {
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once sync.Once
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id string
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}
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func (s *streamID) String() string {
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s.once.Do(func() {
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var err error
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s.id, err = uuid.GenerateUUID()
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if err != nil {
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s.id = time.Now().Format(time.RFC3339Nano)
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}
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})
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return s.id
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}
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func newLoggerForRequest(l Logger, req *pbsubscribe.SubscribeRequest) Logger {
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return l.With(
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"topic", req.Topic.String(),
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"dc", req.Datacenter,
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"key", req.Key,
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"namespace", req.Namespace,
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"index", req.Index,
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"stream_id", &streamID{})
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}
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type eventLogger struct {
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logger Logger
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snapshotDone bool
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count uint64
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}
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func (l *eventLogger) Trace(e stream.Event) {
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switch {
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case e.IsEndOfSnapshot():
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l.snapshotDone = true
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l.logger.Trace("snapshot complete", "index", e.Index, "sent", l.count)
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case e.IsNewSnapshotToFollow():
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l.logger.Trace("starting new snapshot", "sent", l.count)
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return
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case l.snapshotDone:
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l.logger.Trace("sending events", "index", e.Index, "sent", l.count, "batch_size", e.Len())
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}
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l.count += uint64(e.Len())
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}
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