forked from syncthing/syncthing
/
audit.go
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/
audit.go
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// Copyright (C) 2015 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package main
import (
"encoding/json"
"io"
"github.com/syncthing/syncthing/internal/events"
)
// The auditSvc subscribes to events and writes these in JSON format, one
// event per line, to the specified writer.
type auditSvc struct {
w io.Writer // audit destination
stop chan struct{} // signals time to stop
started chan struct{} // signals startup complete
stopped chan struct{} // signals stop complete
}
func newAuditSvc(w io.Writer) *auditSvc {
return &auditSvc{
w: w,
stop: make(chan struct{}),
started: make(chan struct{}),
stopped: make(chan struct{}),
}
}
// Serve runs the audit service.
func (s *auditSvc) Serve() {
defer close(s.stopped)
sub := events.Default.Subscribe(events.AllEvents)
defer events.Default.Unsubscribe(sub)
enc := json.NewEncoder(s.w)
// We're ready to start processing events.
close(s.started)
for {
select {
case ev := <-sub.C():
enc.Encode(ev)
case <-s.stop:
return
}
}
}
// Stop stops the audit service.
func (s *auditSvc) Stop() {
close(s.stop)
}
// WaitForStart returns once the audit service is ready to receive events, or
// immediately if it's already running.
func (s *auditSvc) WaitForStart() {
<-s.started
}
// WaitForStop returns once the audit service has stopped.
// (Needed by the tests.)
func (s *auditSvc) WaitForStop() {
<-s.stopped
}