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connections.go
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connections.go
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// Copyright 2020 Antrea Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// 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 connections
import (
"fmt"
"sync"
"time"
corev1 "k8s.io/api/core/v1"
"k8s.io/klog/v2"
"antrea.io/antrea/pkg/agent/flowexporter"
"antrea.io/antrea/pkg/agent/flowexporter/priorityqueue"
"antrea.io/antrea/pkg/agent/proxy"
"antrea.io/antrea/pkg/util/podstore"
)
const (
periodicDeleteInterval = time.Minute
)
type connectionStore struct {
connections map[flowexporter.ConnectionKey]*flowexporter.Connection
podStore podstore.Interface
antreaProxier proxy.Proxier
expirePriorityQueue *priorityqueue.ExpirePriorityQueue
staleConnectionTimeout time.Duration
mutex sync.Mutex
}
func NewConnectionStore(
podStore podstore.Interface,
proxier proxy.Proxier,
o *flowexporter.FlowExporterOptions) connectionStore {
return connectionStore{
connections: make(map[flowexporter.ConnectionKey]*flowexporter.Connection),
podStore: podStore,
antreaProxier: proxier,
expirePriorityQueue: priorityqueue.NewExpirePriorityQueue(o.ActiveFlowTimeout, o.IdleFlowTimeout),
staleConnectionTimeout: o.StaleConnectionTimeout,
}
}
// GetConnByKey gets the connection in connection map given the connection key.
func (cs *connectionStore) GetConnByKey(connKey flowexporter.ConnectionKey) (*flowexporter.Connection, bool) {
cs.mutex.Lock()
defer cs.mutex.Unlock()
conn, found := cs.connections[connKey]
return conn, found
}
// ForAllConnectionsDo execute the callback for each connection in connection map.
func (cs *connectionStore) ForAllConnectionsDo(callback flowexporter.ConnectionMapCallBack) error {
cs.mutex.Lock()
defer cs.mutex.Unlock()
for k, v := range cs.connections {
err := callback(k, v)
if err != nil {
klog.ErrorS(err, "Callback execution failed for flow", "key", k, "conn", v)
return err
}
}
return nil
}
// ForAllConnectionsDoWithoutLock execute the callback for each connection in connection
// map, without grabbing the lock. Caller is expected to grab lock.
func (cs *connectionStore) ForAllConnectionsDoWithoutLock(callback flowexporter.ConnectionMapCallBack) error {
for k, v := range cs.connections {
err := callback(k, v)
if err != nil {
klog.ErrorS(err, "Callback execution failed for flow", "key", k, "conn", v)
return err
}
}
return nil
}
// AddConnToMap adds the connection to connections map given connection key.
// This is used only for unit tests.
func (cs *connectionStore) AddConnToMap(connKey *flowexporter.ConnectionKey, conn *flowexporter.Connection) {
cs.mutex.Lock()
defer cs.mutex.Unlock()
cs.connections[*connKey] = conn
}
func (cs *connectionStore) fillPodInfo(conn *flowexporter.Connection) {
if cs.podStore == nil {
klog.V(4).Info("Pod store is not available to retrieve local Pods information.")
return
}
// sourceIP/destinationIP are mapped only to local pods and not remote pods.
srcIP := conn.FlowKey.SourceAddress.String()
dstIP := conn.FlowKey.DestinationAddress.String()
srcPod, srcFound := cs.podStore.GetPodByIPAndTime(srcIP, conn.StartTime)
dstPod, dstFound := cs.podStore.GetPodByIPAndTime(dstIP, conn.StartTime)
if srcFound {
conn.SourcePodName = srcPod.Name
conn.SourcePodNamespace = srcPod.Namespace
}
if dstFound {
conn.DestinationPodName = dstPod.Name
conn.DestinationPodNamespace = dstPod.Namespace
}
}
func (cs *connectionStore) fillServiceInfo(conn *flowexporter.Connection, serviceStr string) {
// resolve destination Service information
if cs.antreaProxier != nil {
servicePortName, exists := cs.antreaProxier.GetServiceByIP(serviceStr)
if exists {
conn.DestinationServicePortName = servicePortName.String()
} else {
klog.InfoS("Could not retrieve the Service info from antrea-agent-proxier", "serviceStr", serviceStr)
}
}
}
// LookupServiceProtocol returns the corresponding Service protocol string for a given protocol identifier
func lookupServiceProtocol(protoID uint8) (corev1.Protocol, error) {
serviceProto, found := serviceProtocolMap[protoID]
if !found {
return "", fmt.Errorf("unknown protocol identifier: %d", protoID)
}
return serviceProto, nil
}
func (cs *connectionStore) AcquireConnStoreLock() {
cs.mutex.Lock()
}
func (cs *connectionStore) ReleaseConnStoreLock() {
cs.mutex.Unlock()
}
// UpdateConnAndQueue deletes the inactive connection from keyToItem map,
// without adding it back to the PQ. In this way, we can avoid to reset the
// item's expire time every time we encounter it in the PQ. The method also
// updates active connection's stats fields and adds it back to the PQ. Layer 7
// fields should be set to default to prevent from re-exporting same values.
func (cs *connectionStore) UpdateConnAndQueue(pqItem *flowexporter.ItemToExpire, currTime time.Time) {
conn := pqItem.Conn
conn.LastExportTime = currTime
conn.AppProtocolName = ""
conn.HttpVals = ""
if conn.ReadyToDelete || !conn.IsActive {
cs.expirePriorityQueue.RemoveItemFromMap(conn)
} else {
// For active connections, we update their "prev" stats fields,
// reset active expire time and push back into the PQ.
conn.PrevBytes = conn.OriginalBytes
conn.PrevPackets = conn.OriginalPackets
conn.PrevTCPState = conn.TCPState
conn.PrevReverseBytes = conn.ReverseBytes
conn.PrevReversePackets = conn.ReversePackets
cs.expirePriorityQueue.ResetActiveExpireTimeAndPush(pqItem, currTime)
}
}