/
events.go
971 lines (880 loc) · 25.9 KB
/
events.go
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// Copyright 2018-2019 The NATS 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 server
import (
"encoding/json"
"fmt"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/nats-io/gnatsd/server/pse"
"github.com/nats-io/jwt"
)
const (
connectEventSubj = "$SYS.ACCOUNT.%s.CONNECT"
disconnectEventSubj = "$SYS.ACCOUNT.%s.DISCONNECT"
accConnsReqSubj = "$SYS.REQ.ACCOUNT.%s.CONNS"
accUpdateEventSubj = "$SYS.ACCOUNT.%s.CLAIMS.UPDATE"
connsRespSubj = "$SYS._INBOX_.%s"
accConnsEventSubj = "$SYS.SERVER.ACCOUNT.%s.CONNS"
shutdownEventSubj = "$SYS.SERVER.%s.SHUTDOWN"
authErrorEventSubj = "$SYS.SERVER.%s.CLIENT.AUTH.ERR"
serverStatsSubj = "$SYS.SERVER.%s.STATSZ"
serverStatsReqSubj = "$SYS.REQ.SERVER.%s.STATSZ"
serverStatsPingReqSubj = "$SYS.REQ.SERVER.PING"
leafNodeConnectEventSubj = "$SYS.ACCOUNT.%s.LEAFNODE.CONNECT"
shutdownEventTokens = 4
serverSubjectIndex = 2
accUpdateTokens = 5
accUpdateAccIndex = 2
)
// Used to send and receive messages from inside the server.
type internal struct {
account *Account
client *client
seq uint64
sid uint64
servers map[string]*serverUpdate
sweeper *time.Timer
stmr *time.Timer
subs map[string]msgHandler
sendq chan *pubMsg
wg sync.WaitGroup
orphMax time.Duration
chkOrph time.Duration
statsz time.Duration
}
// ServerStatsMsg is sent periodically with stats updates.
type ServerStatsMsg struct {
Server ServerInfo `json:"server"`
Stats ServerStats `json:"statsz"`
}
// ConnectEventMsg is sent when a new connection is made that is part of an account.
type ConnectEventMsg struct {
Server ServerInfo `json:"server"`
Client ClientInfo `json:"client"`
}
// DisconnectEventMsg is sent when a new connection previously defined from a
// ConnectEventMsg is closed.
type DisconnectEventMsg struct {
Server ServerInfo `json:"server"`
Client ClientInfo `json:"client"`
Sent DataStats `json:"sent"`
Received DataStats `json:"received"`
Reason string `json:"reason"`
}
// AccountNumConns is an event that will be sent from a server that is tracking
// a given account when the number of connections changes. It will also HB
// updates in the absence of any changes.
type AccountNumConns struct {
Server ServerInfo `json:"server"`
Account string `json:"acc"`
Conns int `json:"conns"`
LeafNodes int `json:"leafnodes"`
TotalConns int `json:"total_conns"`
}
// accNumConnsReq is sent when we are starting to track an account for the first
// time. We will request others send info to us about their local state.
type accNumConnsReq struct {
Server ServerInfo `json:"server"`
Account string `json:"acc"`
}
type ServerInfo struct {
Host string `json:"host"`
ID string `json:"id"`
Cluster string `json:"cluster,omitempty"`
Version string `json:"ver"`
Seq uint64 `json:"seq"`
Time time.Time `json:"time"`
}
// ClientInfo is detailed information about the client forming a connection.
type ClientInfo struct {
Start time.Time `json:"start,omitempty"`
Host string `json:"host,omitempty"`
ID uint64 `json:"id"`
Account string `json:"acc"`
User string `json:"user,omitempty"`
Name string `json:"name,omitempty"`
Lang string `json:"lang,omitempty"`
Version string `json:"ver,omitempty"`
RTT string `json:"rtt,omitempty"`
Stop *time.Time `json:"stop,omitempty"`
}
// Various statistics we will periodically send out.
type ServerStats struct {
Start time.Time `json:"start"`
Mem int64 `json:"mem"`
Cores int `json:"cores"`
CPU float64 `json:"cpu"`
Connections int `json:"connections"`
TotalConnections uint64 `json:"total_connections"`
ActiveAccounts int `json:"active_accounts"`
NumSubs uint32 `json:"subscriptions"`
Sent DataStats `json:"sent"`
Received DataStats `json:"received"`
SlowConsumers int64 `json:"slow_consumers"`
Routes []*RouteStat `json:"routes,omitempty"`
Gateways []*GatewayStat `json:"gateways,omitempty"`
}
type RouteStat struct {
ID uint64 `json:"rid"`
Sent DataStats `json:"sent"`
Received DataStats `json:"received"`
Pending int `json:"pending"`
}
type GatewayStat struct {
ID uint64 `json:"gwid"`
Name string `json:"name"`
Sent DataStats `json:"sent"`
Received DataStats `json:"received"`
NumInbound int `json:"inbound_connections"`
}
// DataStats reports how may msg and bytes. Applicable for both sent and received.
type DataStats struct {
Msgs int64 `json:"msgs"`
Bytes int64 `json:"bytes"`
}
// Used for internally queueing up messages that the server wants to send.
type pubMsg struct {
sub string
rply string
si *ServerInfo
msg interface{}
last bool
}
// Used to track server updates.
type serverUpdate struct {
seq uint64
ltime time.Time
}
// internalSendLoop will be responsible for serializing all messages that
// a server wants to send.
func (s *Server) internalSendLoop(wg *sync.WaitGroup) {
defer wg.Done()
s.mu.Lock()
if s.sys == nil || s.sys.sendq == nil {
s.mu.Unlock()
return
}
c := s.sys.client
sendq := s.sys.sendq
id := s.info.ID
host := s.info.Host
seqp := &s.sys.seq
var cluster string
if s.gateway.enabled {
cluster = s.getGatewayName()
}
s.mu.Unlock()
for s.eventsRunning() {
// Setup information for next message
seq := atomic.AddUint64(seqp, 1)
select {
case pm := <-sendq:
if pm.si != nil {
pm.si.Host = host
pm.si.Cluster = cluster
pm.si.ID = id
pm.si.Seq = seq
pm.si.Version = VERSION
pm.si.Time = time.Now()
}
var b []byte
if pm.msg != nil {
b, _ = json.MarshalIndent(pm.msg, _EMPTY_, " ")
}
// Prep internal structures needed to send message.
c.pa.subject = []byte(pm.sub)
c.pa.size = len(b)
c.pa.szb = []byte(strconv.FormatInt(int64(len(b)), 10))
c.pa.reply = []byte(pm.rply)
// Add in NL
b = append(b, _CRLF_...)
c.processInboundClientMsg(b)
c.flushClients(0) // Never spend time in place.
// See if we are doing graceful shutdown.
if pm.last {
return
}
case <-s.quitCh:
return
}
}
}
// Will send a shutdown message.
func (s *Server) sendShutdownEvent() {
s.mu.Lock()
if s.sys == nil || s.sys.sendq == nil {
s.mu.Unlock()
return
}
subj := fmt.Sprintf(shutdownEventSubj, s.info.ID)
sendq := s.sys.sendq
// Stop any more messages from queueing up.
s.sys.sendq = nil
// Unhook all msgHandlers. Normal client cleanup will deal with subs, etc.
s.sys.subs = nil
s.mu.Unlock()
// Send to the internal queue and mark as last.
sendq <- &pubMsg{subj, _EMPTY_, nil, nil, true}
}
// This will queue up a message to be sent.
// Assumes lock is held on entry.
func (s *Server) sendInternalMsg(sub, rply string, si *ServerInfo, msg interface{}) {
if s.sys == nil || s.sys.sendq == nil {
return
}
sendq := s.sys.sendq
// Don't hold lock while placing on the channel.
s.mu.Unlock()
sendq <- &pubMsg{sub, rply, si, msg, false}
s.mu.Lock()
}
// Locked version of checking if events system running. Also checks server.
func (s *Server) eventsRunning() bool {
s.mu.Lock()
er := s.running && s.eventsEnabled()
s.mu.Unlock()
return er
}
// EventsEnabled will report if the server has internal events enabled via
// a defined system account.
func (s *Server) EventsEnabled() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.eventsEnabled()
}
// eventsEnabled will report if events are enabled.
// Lock should be held.
func (s *Server) eventsEnabled() bool {
return s.sys != nil && s.sys.client != nil && s.sys.account != nil
}
// Check for orphan servers who may have gone away without notification.
// This should be wrapChk() to setup common locking.
func (s *Server) checkRemoteServers() {
now := time.Now()
for sid, su := range s.sys.servers {
if now.Sub(su.ltime) > s.sys.orphMax {
s.Debugf("Detected orphan remote server: %q", sid)
// Simulate it going away.
s.processRemoteServerShutdown(sid)
delete(s.sys.servers, sid)
}
}
if s.sys.sweeper != nil {
s.sys.sweeper.Reset(s.sys.chkOrph)
}
}
// Grab RSS and PCPU
func updateServerUsage(v *ServerStats) {
var rss, vss int64
var pcpu float64
pse.ProcUsage(&pcpu, &rss, &vss)
v.Mem = rss
v.CPU = pcpu
v.Cores = numCores
}
// Generate a route stat for our statz update.
func routeStat(r *client) *RouteStat {
if r == nil {
return nil
}
r.mu.Lock()
rs := &RouteStat{
ID: r.cid,
Sent: DataStats{
Msgs: atomic.LoadInt64(&r.outMsgs),
Bytes: atomic.LoadInt64(&r.outBytes),
},
Received: DataStats{
Msgs: atomic.LoadInt64(&r.inMsgs),
Bytes: atomic.LoadInt64(&r.inBytes),
},
Pending: int(r.out.pb),
}
r.mu.Unlock()
return rs
}
// Actual send method for statz updates.
// Lock should be held.
func (s *Server) sendStatsz(subj string) {
m := ServerStatsMsg{}
updateServerUsage(&m.Stats)
m.Stats.Start = s.start
m.Stats.Connections = len(s.clients)
m.Stats.TotalConnections = s.totalClients
m.Stats.ActiveAccounts = int(atomic.LoadInt32(&s.activeAccounts))
m.Stats.Received.Msgs = atomic.LoadInt64(&s.inMsgs)
m.Stats.Received.Bytes = atomic.LoadInt64(&s.inBytes)
m.Stats.Sent.Msgs = atomic.LoadInt64(&s.outMsgs)
m.Stats.Sent.Bytes = atomic.LoadInt64(&s.outBytes)
m.Stats.SlowConsumers = atomic.LoadInt64(&s.slowConsumers)
m.Stats.NumSubs = s.numSubscriptions()
for _, r := range s.routes {
m.Stats.Routes = append(m.Stats.Routes, routeStat(r))
}
if s.gateway.enabled {
gw := s.gateway
gw.RLock()
for name, c := range gw.out {
gs := &GatewayStat{Name: name}
c.mu.Lock()
gs.ID = c.cid
gs.Sent = DataStats{
Msgs: atomic.LoadInt64(&c.outMsgs),
Bytes: atomic.LoadInt64(&c.outBytes),
}
c.mu.Unlock()
// Gather matching inbound connections
gs.Received = DataStats{}
for _, c := range gw.in {
c.mu.Lock()
if c.gw.name == name {
gs.Received.Msgs += atomic.LoadInt64(&c.inMsgs)
gs.Received.Bytes += atomic.LoadInt64(&c.inBytes)
gs.NumInbound++
}
c.mu.Unlock()
}
m.Stats.Gateways = append(m.Stats.Gateways, gs)
}
gw.RUnlock()
}
s.sendInternalMsg(subj, _EMPTY_, &m.Server, &m)
}
// Send out our statz update.
// This should be wrapChk() to setup common locking.
func (s *Server) heartbeatStatsz() {
if s.sys.stmr != nil {
s.sys.stmr.Reset(s.sys.statsz)
}
s.sendStatsz(fmt.Sprintf(serverStatsSubj, s.info.ID))
}
// This should be wrapChk() to setup common locking.
func (s *Server) startStatszTimer() {
s.sys.stmr = time.AfterFunc(s.sys.statsz, s.wrapChk(s.heartbeatStatsz))
}
// Start a ticker that will fire periodically and check for orphaned servers.
// This should be wrapChk() to setup common locking.
func (s *Server) startRemoteServerSweepTimer() {
s.sys.sweeper = time.AfterFunc(s.sys.chkOrph, s.wrapChk(s.checkRemoteServers))
}
// This will setup our system wide tracking subs.
// For now we will setup one wildcard subscription to
// monitor all accounts for changes in number of connections.
// We can make this on a per account tracking basis if needed.
// Tradeoff is subscription and interest graph events vs connect and
// disconnect events, etc.
func (s *Server) initEventTracking() {
if !s.eventsEnabled() {
return
}
subject := fmt.Sprintf(accConnsEventSubj, "*")
if _, err := s.sysSubscribe(subject, s.remoteConnsUpdate); err != nil {
s.Errorf("Error setting up internal tracking: %v", err)
}
// This will be for responses for account info that we send out.
subject = fmt.Sprintf(connsRespSubj, s.info.ID)
if _, err := s.sysSubscribe(subject, s.remoteConnsUpdate); err != nil {
s.Errorf("Error setting up internal tracking: %v", err)
}
// Listen for broad requests to respond with account info.
subject = fmt.Sprintf(accConnsReqSubj, "*")
if _, err := s.sysSubscribe(subject, s.connsRequest); err != nil {
s.Errorf("Error setting up internal tracking: %v", err)
}
// Listen for all server shutdowns.
subject = fmt.Sprintf(shutdownEventSubj, "*")
if _, err := s.sysSubscribe(subject, s.remoteServerShutdown); err != nil {
s.Errorf("Error setting up internal tracking: %v", err)
}
// Listen for account claims updates.
subject = fmt.Sprintf(accUpdateEventSubj, "*")
if _, err := s.sysSubscribe(subject, s.accountClaimUpdate); err != nil {
s.Errorf("Error setting up internal tracking: %v", err)
}
// Listen for requests for our statsz.
subject = fmt.Sprintf(serverStatsReqSubj, s.info.ID)
if _, err := s.sysSubscribe(subject, s.statszReq); err != nil {
s.Errorf("Error setting up internal tracking: %v", err)
}
// Listen for ping messages that will be sent to all servers for statsz.
if _, err := s.sysSubscribe(serverStatsPingReqSubj, s.statszReq); err != nil {
s.Errorf("Error setting up internal tracking: %v", err)
}
// Listen for updates when leaf nodes connect for a given account. This will
// force any gateway connections to move to `modeInterestOnly`
subject = fmt.Sprintf(leafNodeConnectEventSubj, "*")
if _, err := s.sysSubscribe(subject, s.leafNodeConnected); err != nil {
s.Errorf("Error setting up internal tracking: %v", err)
}
}
// accountClaimUpdate will receive claim updates for accounts.
func (s *Server) accountClaimUpdate(sub *subscription, subject, reply string, msg []byte) {
s.mu.Lock()
defer s.mu.Unlock()
if !s.eventsEnabled() {
return
}
toks := strings.Split(subject, tsep)
if len(toks) < accUpdateTokens {
s.Debugf("Received account claims update on bad subject %q", subject)
return
}
if v, ok := s.accounts.Load(toks[accUpdateAccIndex]); ok {
s.updateAccountWithClaimJWT(v.(*Account), string(msg))
}
}
// processRemoteServerShutdown will update any affected accounts.
// Will update the remote count for clients.
// Lock assume held.
func (s *Server) processRemoteServerShutdown(sid string) {
s.accounts.Range(func(k, v interface{}) bool {
a := v.(*Account)
a.mu.Lock()
prev := a.strack[sid]
delete(a.strack, sid)
a.nrclients -= prev.conns
a.nrleafs -= prev.leafs
a.mu.Unlock()
return true
})
}
// remoteServerShutdownEvent is called when we get an event from another server shutting down.
func (s *Server) remoteServerShutdown(sub *subscription, subject, reply string, msg []byte) {
s.mu.Lock()
defer s.mu.Unlock()
if !s.eventsEnabled() {
return
}
toks := strings.Split(subject, tsep)
if len(toks) < shutdownEventTokens {
s.Debugf("Received remote server shutdown on bad subject %q", subject)
return
}
sid := toks[serverSubjectIndex]
su := s.sys.servers[sid]
if su != nil {
s.processRemoteServerShutdown(sid)
}
}
// updateRemoteServer is called when we have an update from a remote server.
// This allows us to track remote servers, respond to shutdown messages properly,
// make sure that messages are ordered, and allow us to prune dead servers.
// Lock should be held upon entry.
func (s *Server) updateRemoteServer(ms *ServerInfo) {
su := s.sys.servers[ms.ID]
if su == nil {
s.sys.servers[ms.ID] = &serverUpdate{ms.Seq, time.Now()}
} else {
// Should alwqys be going up.
if ms.Seq <= su.seq {
s.Errorf("Received out of order remote server update from: %q", ms.ID)
return
}
su.seq = ms.Seq
su.ltime = time.Now()
}
}
// shutdownEventing will clean up all eventing state.
func (s *Server) shutdownEventing() {
if !s.eventsRunning() {
return
}
s.mu.Lock()
clearTimer(&s.sys.sweeper)
clearTimer(&s.sys.stmr)
s.mu.Unlock()
// We will queue up a shutdown event and wait for the
// internal send loop to exit.
s.sendShutdownEvent()
s.sys.wg.Wait()
s.mu.Lock()
defer s.mu.Unlock()
// Whip through all accounts.
s.accounts.Range(func(k, v interface{}) bool {
a := v.(*Account)
a.mu.Lock()
a.nrclients = 0
// Now clear state
clearTimer(&a.etmr)
clearTimer(&a.ctmr)
a.clients = nil
a.strack = nil
a.mu.Unlock()
return true
})
// Turn everything off here.
s.sys = nil
}
// Request for our local connection count.
func (s *Server) connsRequest(sub *subscription, subject, reply string, msg []byte) {
if !s.eventsRunning() {
return
}
m := accNumConnsReq{}
if err := json.Unmarshal(msg, &m); err != nil {
s.sys.client.Errorf("Error unmarshalling account connections request message: %v", err)
return
}
acc, _ := s.lookupAccount(m.Account)
if acc == nil {
return
}
if nlc := acc.NumLocalConnections(); nlc > 0 {
s.mu.Lock()
s.sendAccConnsUpdate(acc, reply)
s.mu.Unlock()
}
}
// leafNodeConnected is an event we will receive when a leaf node for a given account
// connects.
func (s *Server) leafNodeConnected(sub *subscription, subject, reply string, msg []byte) {
m := accNumConnsReq{}
if err := json.Unmarshal(msg, &m); err != nil {
s.sys.client.Errorf("Error unmarshalling account connections request message: %v", err)
return
}
s.mu.Lock()
na := m.Account == "" || !s.eventsEnabled() || !s.gateway.enabled
s.mu.Unlock()
if na {
return
}
if acc, _ := s.lookupAccount(m.Account); acc != nil {
s.switchAccountToInterestMode(acc.Name)
}
}
// statszReq is a request for us to respond with current statz.
func (s *Server) statszReq(sub *subscription, subject, reply string, msg []byte) {
s.mu.Lock()
defer s.mu.Unlock()
if !s.eventsEnabled() || reply == _EMPTY_ {
return
}
s.sendStatsz(reply)
}
// remoteConnsUpdate gets called when we receive a remote update from another server.
func (s *Server) remoteConnsUpdate(sub *subscription, subject, reply string, msg []byte) {
if !s.eventsRunning() {
return
}
m := AccountNumConns{}
if err := json.Unmarshal(msg, &m); err != nil {
s.sys.client.Errorf("Error unmarshalling account connection event message: %v", err)
return
}
// See if we have the account registered, if not drop it.
acc, _ := s.lookupAccount(m.Account)
s.mu.Lock()
defer s.mu.Unlock()
// check again here if we have been shutdown.
if !s.running || !s.eventsEnabled() {
return
}
// Double check that this is not us, should never happen, so error if it does.
if m.Server.ID == s.info.ID {
s.sys.client.Errorf("Processing our own account connection event message: ignored")
return
}
if acc == nil {
s.sys.client.Debugf("Received account connection event for unknown account: %s", m.Account)
return
}
// If we are here we have interest in tracking this account. Update our accounting.
acc.mu.Lock()
if acc.strack == nil {
acc.strack = make(map[string]sconns)
}
// This does not depend on receiving all updates since each one is idempotent.
prev := acc.strack[m.Server.ID]
acc.strack[m.Server.ID] = sconns{conns: int32(m.Conns), leafs: int32(m.LeafNodes)}
acc.nrclients += int32(m.Conns) - prev.conns
acc.nrleafs += int32(m.LeafNodes) - prev.leafs
acc.mu.Unlock()
s.updateRemoteServer(&m.Server)
}
// Setup tracking for this account. This allows us to track globally
// account activity.
// Lock should be held on entry.
func (s *Server) enableAccountTracking(a *Account) {
if a == nil || !s.eventsEnabled() {
return
}
// TODO(ik): Generate payload although message may not be sent.
// May need to ensure we do so only if there is a known interest.
// This can get complicated with gateways.
subj := fmt.Sprintf(accConnsReqSubj, a.Name)
reply := fmt.Sprintf(connsRespSubj, s.info.ID)
m := accNumConnsReq{Account: a.Name}
s.sendInternalMsg(subj, reply, &m.Server, &m)
}
// Event on leaf node connect.
// Lock should NOT be held on entry.
func (s *Server) sendLeafNodeConnect(a *Account) {
s.mu.Lock()
// If we are not in operator mode, or do not have any gateways defined, this should also be a no-op.
if a == nil || !s.eventsEnabled() || !s.gateway.enabled {
s.mu.Unlock()
return
}
subj := fmt.Sprintf(leafNodeConnectEventSubj, a.Name)
m := accNumConnsReq{Account: a.Name}
s.sendInternalMsg(subj, "", &m.Server, &m)
s.mu.Unlock()
s.switchAccountToInterestMode(a.Name)
}
// FIXME(dlc) - make configurable.
const eventsHBInterval = 30 * time.Second
// sendAccConnsUpdate is called to send out our information on the
// account's local connections.
// Lock should be held on entry.
func (s *Server) sendAccConnsUpdate(a *Account, subj string) {
if !s.eventsEnabled() || a == nil || a == s.gacc {
return
}
a.mu.RLock()
// If no limits set, don't update, no need to.
if a.mconns == jwt.NoLimit && a.mleafs == jwt.NoLimit {
a.mu.RUnlock()
return
}
// Build event with account name and number of local clients and leafnodes.
m := AccountNumConns{
Account: a.Name,
Conns: a.numLocalConnections(),
LeafNodes: a.numLocalLeafNodes(),
TotalConns: a.numLocalConnections() + a.numLocalLeafNodes(),
}
a.mu.RUnlock()
s.sendInternalMsg(subj, _EMPTY_, &m.Server, &m)
// Set timer to fire again unless we are at zero.
a.mu.Lock()
if a.numLocalConnections() == 0 {
clearTimer(&a.etmr)
} else {
// Check to see if we have an HB running and update.
if a.ctmr == nil {
a.etmr = time.AfterFunc(eventsHBInterval, func() { s.accConnsUpdate(a) })
} else {
a.etmr.Reset(eventsHBInterval)
}
}
a.mu.Unlock()
}
// accConnsUpdate is called whenever there is a change to the account's
// number of active connections, or during a heartbeat.
func (s *Server) accConnsUpdate(a *Account) {
s.mu.Lock()
defer s.mu.Unlock()
if !s.eventsEnabled() || a == nil {
return
}
subj := fmt.Sprintf(accConnsEventSubj, a.Name)
s.sendAccConnsUpdate(a, subj)
}
// accountConnectEvent will send an account client connect event if there is interest.
// This is a billing event.
func (s *Server) accountConnectEvent(c *client) {
s.mu.Lock()
if !s.eventsEnabled() {
s.mu.Unlock()
return
}
s.mu.Unlock()
subj := fmt.Sprintf(connectEventSubj, c.acc.Name)
c.mu.Lock()
m := ConnectEventMsg{
Client: ClientInfo{
Start: c.start,
Host: c.host,
ID: c.cid,
Account: accForClient(c),
User: nameForClient(c),
Name: c.opts.Name,
Lang: c.opts.Lang,
Version: c.opts.Version,
},
}
c.mu.Unlock()
s.mu.Lock()
s.sendInternalMsg(subj, _EMPTY_, &m.Server, &m)
s.mu.Unlock()
}
// accountDisconnectEvent will send an account client disconnect event if there is interest.
// This is a billing event.
func (s *Server) accountDisconnectEvent(c *client, now time.Time, reason string) {
s.mu.Lock()
gacc := s.gacc
if !s.eventsEnabled() {
s.mu.Unlock()
return
}
s.mu.Unlock()
c.mu.Lock()
// Ignore global account activity
if c.acc == nil || c.acc == gacc {
c.mu.Unlock()
return
}
m := DisconnectEventMsg{
Client: ClientInfo{
Start: c.start,
Stop: &now,
Host: c.host,
ID: c.cid,
Account: accForClient(c),
User: nameForClient(c),
Name: c.opts.Name,
Lang: c.opts.Lang,
Version: c.opts.Version,
RTT: c.getRTT(),
},
Sent: DataStats{
Msgs: c.inMsgs,
Bytes: c.inBytes,
},
Received: DataStats{
Msgs: c.outMsgs,
Bytes: c.outBytes,
},
Reason: reason,
}
c.mu.Unlock()
subj := fmt.Sprintf(disconnectEventSubj, c.acc.Name)
s.mu.Lock()
s.sendInternalMsg(subj, _EMPTY_, &m.Server, &m)
s.mu.Unlock()
}
func (s *Server) sendAuthErrorEvent(c *client) {
s.mu.Lock()
if !s.eventsEnabled() {
s.mu.Unlock()
return
}
s.mu.Unlock()
now := time.Now()
c.mu.Lock()
m := DisconnectEventMsg{
Client: ClientInfo{
Start: c.start,
Stop: &now,
Host: c.host,
ID: c.cid,
Account: accForClient(c),
User: nameForClient(c),
Name: c.opts.Name,
Lang: c.opts.Lang,
Version: c.opts.Version,
RTT: c.getRTT(),
},
Sent: DataStats{
Msgs: c.inMsgs,
Bytes: c.inBytes,
},
Received: DataStats{
Msgs: c.outMsgs,
Bytes: c.outBytes,
},
Reason: AuthenticationViolation.String(),
}
c.mu.Unlock()
s.mu.Lock()
subj := fmt.Sprintf(authErrorEventSubj, s.info.ID)
s.sendInternalMsg(subj, _EMPTY_, &m.Server, &m)
s.mu.Unlock()
}
// Internal message callback. If the msg is needed past the callback it is
// required to be copied.
type msgHandler func(sub *subscription, subject, reply string, msg []byte)
func (s *Server) deliverInternalMsg(sub *subscription, subject, reply, msg []byte) {
s.mu.Lock()
if !s.eventsEnabled() || s.sys.subs == nil {
s.mu.Unlock()
return
}
cb := s.sys.subs[string(sub.sid)]
s.mu.Unlock()
if cb != nil {
cb(sub, string(subject), string(reply), msg)
}
}
// Create an internal subscription. No support for queue groups atm.
func (s *Server) sysSubscribe(subject string, cb msgHandler) (*subscription, error) {
if !s.eventsEnabled() {
return nil, ErrNoSysAccount
}
if cb == nil {
return nil, fmt.Errorf("undefined message handler")
}
s.mu.Lock()
sid := strconv.FormatInt(int64(s.sys.sid), 10)
s.sys.subs[sid] = cb
s.sys.sid++
c := s.sys.client
s.mu.Unlock()
// Now create the subscription
if err := c.processSub([]byte(subject + " " + sid)); err != nil {
return nil, err
}
c.mu.Lock()
sub := c.subs[sid]
c.mu.Unlock()
return sub, nil
}
func (s *Server) sysUnsubscribe(sub *subscription) {
if sub == nil || !s.eventsEnabled() {
return
}
s.mu.Lock()
acc := s.sys.account
c := s.sys.client
delete(s.sys.subs, string(sub.sid))
s.mu.Unlock()
c.unsubscribe(acc, sub, true)
}
// Helper to grab name for a client.
func nameForClient(c *client) string {
if c.user != nil {
return c.user.Nkey
}
return "N/A"
}
// Helper to grab account name for a client.
func accForClient(c *client) string {
if c.acc != nil {
return c.acc.Name
}
return "N/A"
}
// Helper to clear timers.
func clearTimer(tp **time.Timer) {
if t := *tp; t != nil {
t.Stop()
*tp = nil
}
}
// Helper function to wrap functions with common test
// to lock server and return if events not enabled.
func (s *Server) wrapChk(f func()) func() {
return func() {
s.mu.Lock()
defer s.mu.Unlock()
if !s.eventsEnabled() {
return
}
f()
}
}