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processor.go
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processor.go
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// Copyright (c) 2018 Tigera, Inc. All rights reserved.
// 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 policysync
import (
"reflect"
log "github.com/sirupsen/logrus"
"github.com/projectcalico/felix/proto"
)
// MaxMembersPerMessage sets the limit on how many IP Set members to include in an outgoing gRPC message, which has a
// size limit of 4MB (4194304 bytes). Worst case, an IP Set member would be an IPv6 address including a port and
// protocol.
// 2001:0db8:0000:0000:0000:ff00:0042:8329,tcp:65535 = 49 characters
// Protobuf strings have 2 extra bytes of key/length (for lengths < 128), which gives 51 bytes per member, worst case.
// 4194304 / 51 = 82241, which we round down to 82200, giving about 2kB for the rest of the message.
const MaxMembersPerMessage = 82200
type Processor struct {
Updates <-chan interface{}
JoinUpdates chan interface{}
endpointsByID map[proto.WorkloadEndpointID]*EndpointInfo
policyByID map[proto.PolicyID]*policyInfo
profileByID map[proto.ProfileID]*profileInfo
serviceAccountByID map[proto.ServiceAccountID]*proto.ServiceAccountUpdate
namespaceByID map[proto.NamespaceID]*proto.NamespaceUpdate
ipSetsByID map[string]*ipSetInfo
receivedInSync bool
}
type EndpointInfo struct {
// The channel to send updates for this workload to.
output chan<- proto.ToDataplane
currentJoinUID uint64
endpointUpd *proto.WorkloadEndpointUpdate
syncedPolicies map[proto.PolicyID]bool
syncedProfiles map[proto.ProfileID]bool
syncedIPSets map[string]bool
}
type JoinMetadata struct {
EndpointID proto.WorkloadEndpointID
// JoinUID is a correlator, used to match stop requests with join requests.
JoinUID uint64
}
// JoinRequest is sent to the Processor when a new socket connection is accepted by the GRPC server,
// it provides the channel used to send sync messages back to the server goroutine.
type JoinRequest struct {
JoinMetadata
// C is the channel to send updates to the policy sync client. Processor closes the channel when the
// workload endpoint is removed, or when a new JoinRequest is received for the same endpoint. If nil, indicates
// the client wants to stop receiving updates.
C chan<- proto.ToDataplane
}
type LeaveRequest struct {
JoinMetadata
}
func NewProcessor(updates <-chan interface{}) *Processor {
return &Processor{
// Updates from the calculation graph.
Updates: updates,
// JoinUpdates from the new servers that have started.
JoinUpdates: make(chan interface{}, 10),
endpointsByID: make(map[proto.WorkloadEndpointID]*EndpointInfo),
policyByID: make(map[proto.PolicyID]*policyInfo),
profileByID: make(map[proto.ProfileID]*profileInfo),
serviceAccountByID: make(map[proto.ServiceAccountID]*proto.ServiceAccountUpdate),
namespaceByID: make(map[proto.NamespaceID]*proto.NamespaceUpdate),
ipSetsByID: make(map[string]*ipSetInfo),
}
}
func (p *Processor) Start() {
go p.loop()
}
func (p *Processor) loop() {
for {
select {
case update := <-p.Updates:
p.handleDataplane(update)
case joinReq := <-p.JoinUpdates:
log.WithField("update", joinReq).Info("Request received on the join updates channel")
switch r := joinReq.(type) {
case JoinRequest:
p.handleJoin(r)
case LeaveRequest:
p.handleLeave(r)
default:
log.WithField("message", joinReq).Panic("Unexpected message")
}
}
}
}
func (p *Processor) handleJoin(joinReq JoinRequest) {
epID := joinReq.EndpointID
logCxt := log.WithField("joinReq", joinReq).WithField("epID", epID)
ei, ok := p.endpointsByID[epID]
if !ok {
logCxt.Info("Join request for unknown endpoint, pre-creating EndpointInfo")
ei = &EndpointInfo{}
p.endpointsByID[epID] = ei
}
if ei.output != nil {
logCxt.Info("Join request for already-active connection, closing old channel.")
close(ei.output)
} else {
logCxt.Info("Join request with no previously active connection.")
}
ei.currentJoinUID = joinReq.JoinUID
ei.output = joinReq.C
ei.syncedPolicies = map[proto.PolicyID]bool{}
ei.syncedProfiles = map[proto.ProfileID]bool{}
ei.syncedIPSets = map[string]bool{}
p.maybeSyncEndpoint(ei)
// Any updates to service accounts will be synced, but the endpoint needs to know about any existing service
// accounts that were updated before it joined.
p.sendServiceAccounts(ei)
p.sendNamespaces(ei)
if p.receivedInSync {
log.WithField("channel", ei.output).Debug("Already in sync with the datastore, sending in-sync message to client")
ei.output <- proto.ToDataplane{
Payload: &proto.ToDataplane_InSync{InSync: &proto.InSync{}}}
}
logCxt.Debug("Done with join")
}
func (p *Processor) handleLeave(leaveReq LeaveRequest) {
epID := leaveReq.EndpointID
logCxt := log.WithField("leaveReq", leaveReq).WithField("epID", epID)
ei, ok := p.endpointsByID[epID]
if !ok {
logCxt.Info("Leave request for unknown endpoint, ignoring")
return
}
// Make sure we clean up endpointsByID if needed.
defer func() {
if ei.output == nil && ei.currentJoinUID == 0 && ei.endpointUpd == nil {
logCxt.Info("Cleaning up empty EndpointInfo")
delete(p.endpointsByID, epID)
}
}()
if ei.currentJoinUID != leaveReq.JoinUID {
logCxt.Info("Leave request doesn't match active connection, ignoring")
return
}
logCxt.Info("Leave request for active connection, closing channel.")
close(ei.output)
ei.output = nil
ei.currentJoinUID = 0
return
}
func (p *Processor) handleDataplane(update interface{}) {
log.WithFields(log.Fields{"update": update, "type": reflect.TypeOf(update)}).Debug("Dataplane update")
switch update := update.(type) {
case *proto.InSync:
p.handleInSync(update)
case *proto.WorkloadEndpointUpdate:
p.handleWorkloadEndpointUpdate(update)
case *proto.WorkloadEndpointRemove:
p.handleWorkloadEndpointRemove(update)
case *proto.ActiveProfileUpdate:
p.handleActiveProfileUpdate(update)
case *proto.ActiveProfileRemove:
p.handleActiveProfileRemove(update)
case *proto.ActivePolicyUpdate:
p.handleActivePolicyUpdate(update)
case *proto.ActivePolicyRemove:
p.handleActivePolicyRemove(update)
case *proto.ServiceAccountUpdate:
p.handleServiceAccountUpdate(update)
case *proto.ServiceAccountRemove:
p.handleServiceAccountRemove(update)
case *proto.NamespaceUpdate:
p.handleNamespaceUpdate(update)
case *proto.NamespaceRemove:
p.handleNamespaceRemove(update)
case *proto.IPSetUpdate:
p.handleIPSetUpdate(update)
case *proto.IPSetDeltaUpdate:
p.handleIPSetDeltaUpdate(update)
case *proto.IPSetRemove:
p.handleIPSetRemove(update)
default:
log.WithFields(log.Fields{
"type": reflect.TypeOf(update),
}).Warn("Unhandled update")
}
}
func (p *Processor) handleInSync(update *proto.InSync) {
if p.receivedInSync {
log.Debug("Ignoring duplicate InSync message from the calculation graph")
return
}
log.Info("Now in sync with the calculation graph")
p.receivedInSync = true
for _, ei := range p.updateableEndpoints() {
ei.output <- proto.ToDataplane{
Payload: &proto.ToDataplane_InSync{InSync: &proto.InSync{}}}
}
return
}
func (p *Processor) handleWorkloadEndpointUpdate(update *proto.WorkloadEndpointUpdate) {
epID := *update.Id
log.WithField("epID", epID).Info("Endpoint update")
ei, ok := p.endpointsByID[epID]
if !ok {
// Add this endpoint
ei = &EndpointInfo{
endpointUpd: update,
syncedPolicies: map[proto.PolicyID]bool{},
syncedProfiles: map[proto.ProfileID]bool{},
}
p.endpointsByID[epID] = ei
} else {
ei.endpointUpd = update
}
p.maybeSyncEndpoint(ei)
}
func (p *Processor) maybeSyncEndpoint(ei *EndpointInfo) {
if ei.endpointUpd == nil {
log.Debug("Skipping sync: endpoint has no update")
return
}
if ei.output == nil {
log.Debug("Skipping sync: endpoint has no listening client")
return
}
// The calc graph sends us IP sets, policies and profiles before endpoint updates, but the Processor doesn't know
// which endpoints need them until now. Send any unsynced, IP sets, profiles & policies referenced
doAdd, doDel := p.getIPSetsSync(ei)
doAdd()
p.syncAddedPolicies(ei)
p.syncAddedProfiles(ei)
ei.output <- proto.ToDataplane{
Payload: &proto.ToDataplane_WorkloadEndpointUpdate{ei.endpointUpd}}
p.syncRemovedPolicies(ei)
p.syncRemovedProfiles(ei)
doDel()
}
func (p *Processor) handleWorkloadEndpointRemove(update *proto.WorkloadEndpointRemove) {
// we trust the Calc graph never to send us a remove for an endpoint it didn't tell us about
ei := p.endpointsByID[*update.Id]
if ei.output != nil {
// Send update and close down.
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_WorkloadEndpointRemove{update}}
close(ei.output)
}
delete(p.endpointsByID, *update.Id)
}
func (p *Processor) handleActiveProfileUpdate(update *proto.ActiveProfileUpdate) {
pId := *update.Id
profile := update.GetProfile()
p.profileByID[pId] = newProfileInfo(profile)
// Update any endpoints that reference this profile
for _, ei := range p.updateableEndpoints() {
action := func(other proto.ProfileID) bool {
if other == pId {
doAdd, doDel := p.getIPSetsSync(ei)
doAdd()
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_ActiveProfileUpdate{update}}
ei.syncedProfiles[pId] = true
doDel()
return true
}
return false
}
ei.iterateProfiles(action)
}
}
func (p *Processor) handleActiveProfileRemove(update *proto.ActiveProfileRemove) {
pId := *update.Id
log.WithFields(log.Fields{"ProfileID": pId}).Debug("Processing ActiveProfileRemove")
// We trust the Calc graph to remove all references to the Profile before sending the Remove, thus we will have
// already sent the ActiveProfileRemove to any connected endpoints that are affected.
delete(p.profileByID, pId)
}
func (p *Processor) handleActivePolicyUpdate(update *proto.ActivePolicyUpdate) {
pId := *update.Id
log.WithFields(log.Fields{"PolicyID": pId}).Debug("Processing ActivePolicyUpdate")
policy := update.GetPolicy()
p.policyByID[pId] = newPolicyInfo(policy)
// Update any endpoints that reference this policy
for _, ei := range p.updateableEndpoints() {
// Closure of the action to take on each policy on the endpoint.
action := func(other proto.PolicyID) bool {
if other == pId {
doAdd, doDel := p.getIPSetsSync(ei)
doAdd()
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_ActivePolicyUpdate{update}}
ei.syncedPolicies[pId] = true
doDel()
return true
}
return false
}
ei.iteratePolicies(action)
}
}
func (p *Processor) handleActivePolicyRemove(update *proto.ActivePolicyRemove) {
pId := *update.Id
log.WithFields(log.Fields{"PolicyID": pId}).Debug("Processing ActivePolicyRemove")
// We trust the Calc graph to remove all references to the Policy before sending the Remove, thus we will have
// already sent the ActivePolicyRemove to any connected endpoints that are affected.
delete(p.policyByID, pId)
}
func (p *Processor) handleServiceAccountUpdate(update *proto.ServiceAccountUpdate) {
id := *update.Id
log.WithField("ServiceAccountID", id).Debug("Processing ServiceAccountUpdate")
for _, ei := range p.updateableEndpoints() {
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_ServiceAccountUpdate{update}}
}
p.serviceAccountByID[id] = update
return
}
func (p *Processor) handleServiceAccountRemove(update *proto.ServiceAccountRemove) {
id := *update.Id
log.WithField("ServiceAccountID", id).Debug("Processing ServiceAccountRemove")
for _, ei := range p.updateableEndpoints() {
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_ServiceAccountRemove{update}}
}
delete(p.serviceAccountByID, id)
}
func (p *Processor) handleNamespaceUpdate(update *proto.NamespaceUpdate) {
id := *update.Id
log.WithField("NamespaceID", id).Debug("Processing NamespaceUpdate")
for _, ei := range p.updateableEndpoints() {
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_NamespaceUpdate{update}}
}
p.namespaceByID[id] = update
return
}
func (p *Processor) handleNamespaceRemove(update *proto.NamespaceRemove) {
id := *update.Id
log.WithField("NamespaceID", id).Debug("Processing NamespaceRemove")
for _, ei := range p.updateableEndpoints() {
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_NamespaceRemove{update}}
}
delete(p.namespaceByID, id)
}
func (p *Processor) handleIPSetUpdate(update *proto.IPSetUpdate) {
id := update.Id
logCxt := log.WithField("ID", id)
logCxt.Debug("Processing IPSetUpdate")
s, ok := p.ipSetsByID[id]
if !ok {
logCxt.Info("Adding new IP Set")
s = newIPSet(update)
p.ipSetsByID[id] = s
// Since the calc graph will always send IPSets before any policies/profiles
// that reference them, we don't know which endpoints will need this IPSet yet,
// so we can stop processing here.
return
}
logCxt.Info("Updating existing IPSet")
s.replaceMembers(update)
// gRPC has limits on message size, so break up large update if necessary.
updates := splitIPSetUpdate(update)
for _, ei := range p.updateableEndpoints() {
if p.referencesIPSet(ei, id) {
ei.syncedIPSets[id] = true
for _, u := range updates {
ei.output <- u
}
}
}
}
func (p *Processor) handleIPSetDeltaUpdate(update *proto.IPSetDeltaUpdate) {
id := update.Id
log.WithField("ID", id).Debug("Processing IPSetDeltaUpdate")
// We trust the calc graph to never send us Delta updates for non-existent sets.
s := p.ipSetsByID[id]
s.deltaUpdate(update)
// gRPC has limits on message size, so break up large update if necessary.
updates := splitIPSetDeltaUpdate(update)
for _, ei := range p.updateableEndpoints() {
if p.referencesIPSet(ei, id) {
for _, u := range updates {
ei.output <- u
}
}
}
}
func (p *Processor) handleIPSetRemove(update *proto.IPSetRemove) {
id := update.Id
log.WithField("ID", id).Debug("Processing IPSetRemove")
delete(p.ipSetsByID, id)
// No need to send the update to any endpoints, since that will happen
// as soon as the endpoint no longer has a reference to the IPSet.
}
func (p *Processor) syncAddedPolicies(ei *EndpointInfo) {
ei.iteratePolicies(func(pId proto.PolicyID) bool {
if !ei.syncedPolicies[pId] {
policy := p.policyByID[pId].p
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_ActivePolicyUpdate{
&proto.ActivePolicyUpdate{
Id: &pId,
Policy: policy,
},
}}
ei.syncedPolicies[pId] = true
}
return false
})
}
// syncRemovedPolicies sends ActivePolicyRemove messages for any previously active, but now unused
// policies.
func (p *Processor) syncRemovedPolicies(ei *EndpointInfo) {
oldSyncedPolicies := ei.syncedPolicies
ei.syncedPolicies = map[proto.PolicyID]bool{}
ei.iteratePolicies(func(pId proto.PolicyID) bool {
if !oldSyncedPolicies[pId] {
log.WithFields(log.Fields{
"PolicyID": pId,
"endpoint": ei.endpointUpd.GetId(),
}).Panic("syncing removed policies before all policies are added")
}
// Still an active policy, remove it from the old set.
delete(oldSyncedPolicies, pId)
ei.syncedPolicies[pId] = true
return false
})
// oldSyncedPolicies now contains only policies that are no longer needed by this endpoint.
for polID := range oldSyncedPolicies {
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_ActivePolicyRemove{
&proto.ActivePolicyRemove{Id: &polID},
}}
}
}
func (p *Processor) syncAddedProfiles(ei *EndpointInfo) {
ei.iterateProfiles(func(pId proto.ProfileID) bool {
if !ei.syncedProfiles[pId] {
profile := p.profileByID[pId].p
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_ActiveProfileUpdate{
&proto.ActiveProfileUpdate{
Id: &pId,
Profile: profile,
},
}}
ei.syncedProfiles[pId] = true
}
return false
})
}
// syncRemovedProfiles sends ActiveProfileRemove messages for any previously active, but now unused
// profiles.
func (p *Processor) syncRemovedProfiles(ei *EndpointInfo) {
oldSyncedProfiles := ei.syncedProfiles
ei.syncedProfiles = map[proto.ProfileID]bool{}
ei.iterateProfiles(func(pId proto.ProfileID) bool {
if !oldSyncedProfiles[pId] {
log.WithField("profileID", pId).Panic("syncing removed profiles before all profiles are added")
}
// Still an active profile, remove it from the old set.
delete(oldSyncedProfiles, pId)
ei.syncedProfiles[pId] = true
return false
})
// oldSyncedProfiles now contains only policies that are no longer needed by this endpoint.
for polID := range oldSyncedProfiles {
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_ActiveProfileRemove{
&proto.ActiveProfileRemove{Id: &polID},
}}
}
}
// sendServiceAccounts sends all known ServiceAccounts to the endpoint
func (p *Processor) sendServiceAccounts(ei *EndpointInfo) {
for _, update := range p.serviceAccountByID {
log.WithFields(log.Fields{
"serviceAccount": update.Id,
"endpoint": ei.endpointUpd.GetEndpoint(),
}).Debug("sending ServiceAccountUpdate")
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_ServiceAccountUpdate{update}}
}
}
// sendNamespaces sends all known Namespaces to the endpoint
func (p *Processor) sendNamespaces(ei *EndpointInfo) {
for _, update := range p.namespaceByID {
log.WithFields(log.Fields{
"namespace": update.Id,
"endpoint": ei.endpointUpd.GetEndpoint(),
}).Debug("sending NamespaceUpdate")
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_NamespaceUpdate{update}}
}
}
// A slice of all the Endpoints that can currently be sent updates.
func (p *Processor) updateableEndpoints() []*EndpointInfo {
out := make([]*EndpointInfo, 0)
for _, ei := range p.endpointsByID {
if ei.output != nil {
out = append(out, ei)
}
}
return out
}
// referencesIPSet determines whether the endpoint's policies or profiles reference a given IPSet
func (p *Processor) referencesIPSet(ei *EndpointInfo, id string) bool {
var found = false
ei.iterateProfiles(func(pid proto.ProfileID) bool {
pi := p.profileByID[pid]
if pi.referencesIPSet(id) {
found = true
return true
}
return false
})
// bail out here if we found a ref
if found {
return true
}
// otherwise, check policies
ei.iteratePolicies(func(pid proto.PolicyID) bool {
pi := p.policyByID[pid]
if pi.referencesIPSet(id) {
found = true
return true
}
return false
})
return found
}
// syncIPSets computes IPSets to be added and removed for an endpoint. Returns closures that do the
// add and remove since we often want to sequence these around other operations.
func (p *Processor) getIPSetsSync(ei *EndpointInfo) (func(), func()) {
// Compute all the IPSets that should be synced.
newS := map[string]bool{}
ei.iterateProfiles(func(id proto.ProfileID) bool {
pi := p.profileByID[id]
for ipset := range pi.refs {
newS[ipset] = true
}
return false
})
ei.iteratePolicies(func(id proto.PolicyID) bool {
pi := p.policyByID[id]
for ipset := range pi.refs {
newS[ipset] = true
}
return false
})
oldS := ei.syncedIPSets
var toAdd []string
for ipset := range newS {
if !oldS[ipset] {
toAdd = append(toAdd, ipset)
}
delete(oldS, ipset)
}
// oldS now only contains items to be deleted
ei.syncedIPSets = newS
doAdd := func() {
for _, ipset := range toAdd {
p.sendIPSetUpdate(ei, ipset)
}
}
doDel := func() {
for ipset := range oldS {
p.sendIPSetRemove(ei, ipset)
}
}
return doAdd, doDel
}
func (p *Processor) sendIPSetUpdate(ei *EndpointInfo, id string) {
si := p.ipSetsByID[id]
updates := splitIPSetUpdate(si.getIPSetUpdate())
for _, u := range updates {
ei.output <- u
}
}
func (p *Processor) sendIPSetRemove(ei *EndpointInfo, id string) {
ei.output <- proto.ToDataplane{Payload: &proto.ToDataplane_IpsetRemove{IpsetRemove: &proto.IPSetRemove{Id: id}}}
}
// Perform the action on every policy on the Endpoint, breaking if the action returns true.
func (ei *EndpointInfo) iteratePolicies(action func(id proto.PolicyID) (stop bool)) {
var pId proto.PolicyID
seen := make(map[proto.PolicyID]bool)
for _, tier := range ei.endpointUpd.GetEndpoint().GetTiers() {
pId.Tier = tier.Name
for _, name := range tier.GetIngressPolicies() {
pId.Name = name
// No need to check seen since we trust Calc graph to only list a policy once per tier.
seen[pId] = true
if action(pId) {
return
}
}
for _, name := range tier.GetEgressPolicies() {
pId.Name = name
if !seen[pId] {
seen[pId] = true
if action(pId) {
return
}
}
}
}
}
// Perform the action on every profile on the Endpoint, breaking if the action returns true.
func (ei *EndpointInfo) iterateProfiles(action func(id proto.ProfileID) (stop bool)) {
var pId proto.ProfileID
for _, name := range ei.endpointUpd.GetEndpoint().GetProfileIds() {
pId.Name = name
if action(pId) {
return
}
}
}
// splitIPSetUpdate splits updates that would not fit into a single gRPC message into several smaller ones.
func splitIPSetUpdate(update *proto.IPSetUpdate) []proto.ToDataplane {
mPerMsg := splitMembers(update.GetMembers())
numMsg := len(mPerMsg)
out := make([]proto.ToDataplane, numMsg)
// First message is always IPSetUpdate, and always is included.
out[0].Payload = &proto.ToDataplane_IpsetUpdate{IpsetUpdate: &proto.IPSetUpdate{
Id: update.Id,
Type: update.Type,
Members: mPerMsg[0],
}}
// If there are additional messages, they are IPSetDeltaUpdates
for i := 1; i < numMsg; i++ {
out[i].Payload = &proto.ToDataplane_IpsetDeltaUpdate{IpsetDeltaUpdate: &proto.IPSetDeltaUpdate{
Id: update.Id,
AddedMembers: mPerMsg[i],
}}
}
return out
}
// splitIPSetDeltaUpdate splits updates that would not fit into a single gRPC message into smaller ones.
func splitIPSetDeltaUpdate(update *proto.IPSetDeltaUpdate) []proto.ToDataplane {
adds := splitMembers(update.GetAddedMembers())
dels := splitMembers(update.GetRemovedMembers())
var out []proto.ToDataplane
for len(adds)+len(dels) > 0 {
msg := proto.ToDataplane{Payload: &proto.ToDataplane_IpsetDeltaUpdate{
IpsetDeltaUpdate: &proto.IPSetDeltaUpdate{Id: update.GetId()}}}
out = append(out, msg)
update := msg.GetIpsetDeltaUpdate()
if len(adds) > 0 {
update.AddedMembers = adds[0]
adds = adds[1:]
}
// Put removes on the message if they fit, but work from end end of the list since that is where
// partial slices will be.
end := len(dels) - 1
log.Errorf("end %d", end)
if len(dels) > 0 && (len(update.AddedMembers)+len(dels[end])) <= MaxMembersPerMessage {
update.RemovedMembers = dels[end]
dels = dels[0:end]
}
}
return out
}
func splitMembers(members []string) [][]string {
// We handle this very simply with a conservative maximum number of members. We could spin through and add up the
// actual member lengths, which could mean fewer messages, since few members will have the max length (IPv6 + port
// + protocol). However, that would make this code more complex and slow message generation down, which would
// offset gains we might get with fewer messages.
out := make([][]string, 0)
first := 0
remains := len(members)
if remains == 0 {
// Special case handling an empty slice as input because we always want to return at least one element in the
// output (a slice containing and empty slice). This simplifies calling code that has to send a different
// initial message.
return [][]string{{}}
}
for remains > 0 {
numThis := MaxMembersPerMessage
if remains < numThis {
numThis = remains
}
end := first + numThis
sliceThis := members[first:end]
out = append(out, sliceThis)
first = end
remains = remains - numThis
}
return out
}