/
trail.go
109 lines (96 loc) · 3.09 KB
/
trail.go
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/*******************************************************************************
*
* Copyright 2019 SAP SE
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You should have received a copy of the License along with this
* program. If not, you may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*******************************************************************************/
package audittools
import (
"net/url"
"time"
"github.com/sapcc/go-api-declarations/cadf"
"github.com/sapcc/go-bits/logg"
)
// AuditTrail holds an event sink for receiving audit events and closure functions
// that are executed in case of successful and failed publishing.
type AuditTrail struct {
EventSink <-chan cadf.Event
OnSuccessfulPublish func()
OnFailedPublish func()
}
// Commit takes a AuditTrail that receives audit events from an event sink and publishes them to
// a specific RabbitMQ Connection using the specified amqp URI and queue name.
// The OnSuccessfulPublish and OnFailedPublish closures are executed as per
// their respective case.
func (t AuditTrail) Commit(rabbitmqURI url.URL, rabbitmqQueueName string) {
rc, err := NewRabbitConnection(rabbitmqURI, rabbitmqQueueName)
if err != nil {
logg.Error(err.Error())
}
sendEvent := func(e *cadf.Event) bool {
rc = refreshConnectionIfClosedOrOld(rc, rabbitmqURI, rabbitmqQueueName)
err := rc.PublishEvent(e)
if err != nil {
t.OnFailedPublish()
logg.Error("audittools: failed to publish audit event with ID %q: %s", e.ID, err.Error())
return false
}
t.OnSuccessfulPublish()
return true
}
var pendingEvents []cadf.Event
ticker := time.NewTicker(1 * time.Minute)
defer ticker.Stop()
for {
select {
case e := <-t.EventSink:
if successful := sendEvent(&e); !successful {
pendingEvents = append(pendingEvents, e)
}
case <-ticker.C:
for len(pendingEvents) > 0 {
successful := false // until proven otherwise
nextEvent := pendingEvents[0]
if successful = sendEvent(&nextEvent); !successful {
// One more try before giving up. We simply set rc to nil
// and sendEvent() will take care of refreshing the
// connection.
time.Sleep(5 * time.Second)
rc = nil
successful = sendEvent(&nextEvent)
}
if successful {
pendingEvents = pendingEvents[1:]
} else {
break
}
}
}
}
}
func refreshConnectionIfClosedOrOld(rc *RabbitConnection, uri url.URL, queueName string) *RabbitConnection {
if !rc.IsNilOrClosed() {
if time.Since(rc.LastConnectedAt) < 5*time.Minute {
return rc
}
rc.Disconnect()
}
connection, err := NewRabbitConnection(uri, queueName)
if err != nil {
logg.Error(err.Error())
return nil
}
return connection
}