/
jetstream.go
2708 lines (2425 loc) · 72.5 KB
/
jetstream.go
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// Copyright 2019-2022 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 (
"crypto/hmac"
"crypto/sha256"
"encoding/binary"
"encoding/hex"
"encoding/json"
"fmt"
"math"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/minio/highwayhash"
"github.com/nats-io/nats-server/v2/server/sysmem"
"github.com/nats-io/nkeys"
"github.com/nats-io/nuid"
)
// JetStreamConfig determines this server's configuration.
// MaxMemory and MaxStore are in bytes.
type JetStreamConfig struct {
MaxMemory int64 `json:"max_memory"`
MaxStore int64 `json:"max_storage"`
StoreDir string `json:"store_dir,omitempty"`
Domain string `json:"domain,omitempty"`
CompressOK bool `json:"compress_ok,omitempty"`
}
// Statistics about JetStream for this server.
type JetStreamStats struct {
Memory uint64 `json:"memory"`
Store uint64 `json:"storage"`
ReservedMemory uint64 `json:"reserved_memory"`
ReservedStore uint64 `json:"reserved_storage"`
Accounts int `json:"accounts"`
HAAssets int `json:"ha_assets"`
API JetStreamAPIStats `json:"api"`
}
type JetStreamAccountLimits struct {
MaxMemory int64 `json:"max_memory"`
MaxStore int64 `json:"max_storage"`
MaxStreams int `json:"max_streams"`
MaxConsumers int `json:"max_consumers"`
MaxAckPending int `json:"max_ack_pending"`
MemoryMaxStreamBytes int64 `json:"memory_max_stream_bytes"`
StoreMaxStreamBytes int64 `json:"storage_max_stream_bytes"`
MaxBytesRequired bool `json:"max_bytes_required"`
}
type JetStreamTier struct {
Memory uint64 `json:"memory"`
Store uint64 `json:"storage"`
Streams int `json:"streams"`
Consumers int `json:"consumers"`
Limits JetStreamAccountLimits `json:"limits"`
}
// JetStreamAccountStats returns current statistics about the account's JetStream usage.
type JetStreamAccountStats struct {
JetStreamTier // in case tiers are used, reflects totals with limits not set
Domain string `json:"domain,omitempty"`
API JetStreamAPIStats `json:"api"`
Tiers map[string]JetStreamTier `json:"tiers,omitempty"` // indexed by tier name
}
type JetStreamAPIStats struct {
Total uint64 `json:"total"`
Errors uint64 `json:"errors"`
Inflight uint64 `json:"inflight,omitempty"`
}
// This is for internal accounting for JetStream for this server.
type jetStream struct {
// These are here first because of atomics on 32bit systems.
apiInflight int64
apiTotal int64
apiErrors int64
memReserved int64
storeReserved int64
memUsed int64
storeUsed int64
clustered int32
mu sync.RWMutex
srv *Server
config JetStreamConfig
cluster *jetStreamCluster
accounts map[string]*jsAccount
apiSubs *Sublist
started time.Time
// System level request to purge a stream move
accountPurge *subscription
metaRecovering bool
standAlone bool
disabled bool
oos bool
}
type remoteUsage struct {
tiers map[string]*jsaUsage // indexed by tier name
api uint64
err uint64
}
type jsaStorage struct {
total jsaUsage
local jsaUsage
}
// This represents a jetstream enabled account.
// Worth noting that we include the jetstream pointer, this is because
// in general we want to be very efficient when receiving messages on
// an internal sub for a stream, so we will direct link to the stream
// and walk backwards as needed vs multiple hash lookups and locks, etc.
type jsAccount struct {
mu sync.RWMutex
js *jetStream
account *Account
storeDir string
streams map[string]*stream
templates map[string]*streamTemplate
store TemplateStore
// From server
sendq *ipQueue // of *pubMsg
// Usage/limits related fields that will be protected by usageMu
usageMu sync.RWMutex
limits map[string]JetStreamAccountLimits // indexed by tierName
usage map[string]*jsaStorage // indexed by tierName
rusage map[string]*remoteUsage // indexed by node id
apiTotal uint64
apiErrors uint64
usageApi uint64
usageErr uint64
updatesPub string
updatesSub *subscription
lupdate time.Time
utimer *time.Timer
}
// Track general usage for this account.
type jsaUsage struct {
mem int64
store int64
}
// EnableJetStream will enable JetStream support on this server with the given configuration.
// A nil configuration will dynamically choose the limits and temporary file storage directory.
func (s *Server) EnableJetStream(config *JetStreamConfig) error {
if s.JetStreamEnabled() {
return fmt.Errorf("jetstream already enabled")
}
s.Noticef("Starting JetStream")
if config == nil || config.MaxMemory <= 0 || config.MaxStore <= 0 {
var storeDir, domain string
var maxStore, maxMem int64
if config != nil {
storeDir, domain = config.StoreDir, config.Domain
maxStore, maxMem = config.MaxStore, config.MaxMemory
}
config = s.dynJetStreamConfig(storeDir, maxStore, maxMem)
if maxMem > 0 {
config.MaxMemory = maxMem
}
if domain != _EMPTY_ {
config.Domain = domain
}
s.Debugf("JetStream creating dynamic configuration - %s memory, %s disk", friendlyBytes(config.MaxMemory), friendlyBytes(config.MaxStore))
} else if config.StoreDir != _EMPTY_ {
config.StoreDir = filepath.Join(config.StoreDir, JetStreamStoreDir)
}
cfg := *config
if cfg.StoreDir == _EMPTY_ {
cfg.StoreDir = filepath.Join(os.TempDir(), JetStreamStoreDir)
}
// We will consistently place the 'jetstream' directory under the storedir that was handed to us. Prior to 2.2.3 though
// we could have a directory on disk without the 'jetstream' directory. This will check and fix if needed.
if err := s.checkStoreDir(&cfg); err != nil {
return err
}
return s.enableJetStream(cfg)
}
// Function signature to generate a key encryption key.
type keyGen func(context []byte) ([]byte, error)
// Return a key generation function or nil if encryption not enabled.
// keyGen defined in filestore.go - keyGen func(iv, context []byte) []byte
func (s *Server) jsKeyGen(info string) keyGen {
if ek := s.getOpts().JetStreamKey; ek != _EMPTY_ {
return func(context []byte) ([]byte, error) {
h := hmac.New(sha256.New, []byte(ek))
if _, err := h.Write([]byte(info)); err != nil {
return nil, err
}
if _, err := h.Write(context); err != nil {
return nil, err
}
return h.Sum(nil), nil
}
}
return nil
}
// Decode the encrypted metafile.
func (s *Server) decryptMeta(sc StoreCipher, ekey, buf []byte, acc, context string) ([]byte, error) {
if len(ekey) < minMetaKeySize {
return nil, errBadKeySize
}
prf := s.jsKeyGen(acc)
if prf == nil {
return nil, errNoEncryption
}
rb, err := prf([]byte(context))
if err != nil {
return nil, err
}
kek, err := genEncryptionKey(sc, rb)
if err != nil {
return nil, err
}
ns := kek.NonceSize()
seed, err := kek.Open(nil, ekey[:ns], ekey[ns:], nil)
if err != nil {
return nil, err
}
aek, err := genEncryptionKey(sc, seed)
if err != nil {
return nil, err
}
plain, err := aek.Open(nil, buf[:ns], buf[ns:], nil)
if err != nil {
return nil, err
}
return plain, nil
}
// Check to make sure directory has the jetstream directory.
// We will have it properly configured here now regardless, so need to look inside.
func (s *Server) checkStoreDir(cfg *JetStreamConfig) error {
fis, _ := os.ReadDir(cfg.StoreDir)
// If we have nothing underneath us, could be just starting new, but if we see this we can check.
if len(fis) != 0 {
return nil
}
// Let's check the directory above. If it has us 'jetstream' but also other stuff that we can
// identify as accounts then we can fix.
fis, _ = os.ReadDir(filepath.Dir(cfg.StoreDir))
// If just one that is us 'jetstream' and all is ok.
if len(fis) == 1 {
return nil
}
haveJetstreamDir := false
for _, fi := range fis {
if fi.Name() == JetStreamStoreDir {
haveJetstreamDir = true
break
}
}
for _, fi := range fis {
// Skip the 'jetstream' directory.
if fi.Name() == JetStreamStoreDir {
continue
}
// Let's see if this is an account.
if accName := fi.Name(); accName != _EMPTY_ {
_, ok := s.accounts.Load(accName)
if !ok && s.AccountResolver() != nil && nkeys.IsValidPublicAccountKey(accName) {
// Account is not local but matches the NKEY account public key,
// this is enough indication to move this directory, no need to
// fetch the account.
ok = true
}
// If this seems to be an account go ahead and move the directory. This will include all assets
// like streams and consumers.
if ok {
if !haveJetstreamDir {
err := os.Mkdir(filepath.Join(filepath.Dir(cfg.StoreDir), JetStreamStoreDir), defaultDirPerms)
if err != nil {
return err
}
haveJetstreamDir = true
}
old := filepath.Join(filepath.Dir(cfg.StoreDir), fi.Name())
new := filepath.Join(cfg.StoreDir, fi.Name())
s.Noticef("JetStream relocated account %q to %q", old, new)
if err := os.Rename(old, new); err != nil {
return err
}
}
}
}
return nil
}
// enableJetStream will start up the JetStream subsystem.
func (s *Server) enableJetStream(cfg JetStreamConfig) error {
js := &jetStream{srv: s, config: cfg, accounts: make(map[string]*jsAccount), apiSubs: NewSublistNoCache()}
s.gcbMu.Lock()
if s.gcbOutMax = s.getOpts().JetStreamMaxCatchup; s.gcbOutMax == 0 {
s.gcbOutMax = defaultMaxTotalCatchupOutBytes
}
s.gcbMu.Unlock()
s.mu.Lock()
s.js = js
s.mu.Unlock()
// FIXME(dlc) - Allow memory only operation?
if stat, err := os.Stat(cfg.StoreDir); os.IsNotExist(err) {
if err := os.MkdirAll(cfg.StoreDir, defaultDirPerms); err != nil {
return fmt.Errorf("could not create storage directory - %v", err)
}
} else {
// Make sure its a directory and that we can write to it.
if stat == nil || !stat.IsDir() {
return fmt.Errorf("storage directory is not a directory")
}
tmpfile, err := os.CreateTemp(cfg.StoreDir, "_test_")
if err != nil {
return fmt.Errorf("storage directory is not writable")
}
tmpfile.Close()
os.Remove(tmpfile.Name())
}
// JetStream is an internal service so we need to make sure we have a system account.
// This system account will export the JetStream service endpoints.
if s.SystemAccount() == nil {
s.SetDefaultSystemAccount()
}
s.Noticef(" _ ___ _____ ___ _____ ___ ___ _ __ __")
s.Noticef(" _ | | __|_ _/ __|_ _| _ \\ __| /_\\ | \\/ |")
s.Noticef("| || | _| | | \\__ \\ | | | / _| / _ \\| |\\/| |")
s.Noticef(" \\__/|___| |_| |___/ |_| |_|_\\___/_/ \\_\\_| |_|")
s.Noticef("")
s.Noticef(" https://docs.nats.io/jetstream")
s.Noticef("")
s.Noticef("---------------- JETSTREAM ----------------")
s.Noticef(" Max Memory: %s", friendlyBytes(cfg.MaxMemory))
s.Noticef(" Max Storage: %s", friendlyBytes(cfg.MaxStore))
s.Noticef(" Store Directory: \"%s\"", cfg.StoreDir)
if cfg.Domain != _EMPTY_ {
s.Noticef(" Domain: %s", cfg.Domain)
}
opts := s.getOpts()
if ek := opts.JetStreamKey; ek != _EMPTY_ {
s.Noticef(" Encryption: %s", opts.JetStreamCipher)
}
s.Noticef("-------------------------------------------")
// Setup our internal subscriptions.
if err := s.setJetStreamExportSubs(); err != nil {
return fmt.Errorf("setting up internal jetstream subscriptions failed: %v", err)
}
// Setup our internal system exports.
s.Debugf(" Exports:")
s.Debugf(" %s", jsAllAPI)
s.setupJetStreamExports()
standAlone, canExtend := s.standAloneMode(), s.canExtendOtherDomain()
if standAlone && canExtend && s.getOpts().JetStreamExtHint != jsWillExtend {
canExtend = false
s.Noticef("Standalone server started in clustered mode do not support extending domains")
s.Noticef(`Manually disable standalone mode by setting the JetStream Option "extension_hint: %s"`, jsWillExtend)
}
// Indicate if we will be standalone for checking resource reservations, etc.
js.setJetStreamStandAlone(standAlone && !canExtend)
// Enable accounts and restore state before starting clustering.
if err := s.enableJetStreamAccounts(); err != nil {
return err
}
// If we are in clustered mode go ahead and start the meta controller.
if !standAlone || canExtend {
if err := s.enableJetStreamClustering(); err != nil {
return err
}
}
// Mark when we are up and running.
js.setStarted()
return nil
}
const jsNoExtend = "no_extend"
const jsWillExtend = "will_extend"
// This will check if we have a solicited leafnode that shares the system account
// and extension is not manually disabled
func (s *Server) canExtendOtherDomain() bool {
opts := s.getOpts()
sysAcc := s.SystemAccount().GetName()
for _, r := range opts.LeafNode.Remotes {
if r.LocalAccount == sysAcc {
for _, denySub := range r.DenyImports {
if subjectIsSubsetMatch(denySub, raftAllSubj) {
return false
}
}
return true
}
}
return false
}
func (s *Server) updateJetStreamInfoStatus(enabled bool) {
s.mu.Lock()
s.info.JetStream = enabled
s.mu.Unlock()
}
// restartJetStream will try to re-enable JetStream during a reload if it had been disabled during runtime.
func (s *Server) restartJetStream() error {
opts := s.getOpts()
cfg := JetStreamConfig{
StoreDir: opts.StoreDir,
MaxMemory: opts.JetStreamMaxMemory,
MaxStore: opts.JetStreamMaxStore,
Domain: opts.JetStreamDomain,
}
s.Noticef("Restarting JetStream")
err := s.EnableJetStream(&cfg)
if err != nil {
s.Warnf("Can't start JetStream: %v", err)
return s.DisableJetStream()
}
s.updateJetStreamInfoStatus(true)
return nil
}
// checkStreamExports will check if we have the JS exports setup
// on the system account, and if not go ahead and set them up.
func (s *Server) checkJetStreamExports() {
if sacc := s.SystemAccount(); sacc != nil {
sacc.mu.RLock()
se := sacc.getServiceExport(jsAllAPI)
sacc.mu.RUnlock()
if se == nil {
s.setupJetStreamExports()
}
}
}
func (s *Server) setupJetStreamExports() {
// Setup our internal system export.
if err := s.SystemAccount().AddServiceExport(jsAllAPI, nil); err != nil {
s.Warnf("Error setting up jetstream service exports: %v", err)
}
}
func (s *Server) jetStreamOOSPending() (wasPending bool) {
s.mu.Lock()
js := s.js
s.mu.Unlock()
if js != nil {
js.mu.Lock()
wasPending = js.oos
js.oos = true
js.mu.Unlock()
}
return wasPending
}
func (s *Server) setJetStreamDisabled() {
s.mu.Lock()
js := s.js
s.mu.Unlock()
if js != nil {
js.mu.Lock()
js.disabled = true
js.mu.Unlock()
}
}
func (s *Server) handleOutOfSpace(mset *stream) {
if s.JetStreamEnabled() && !s.jetStreamOOSPending() {
var stream string
if mset != nil {
stream = mset.name()
s.Errorf("JetStream out of %s resources, will be DISABLED", mset.Store().Type())
} else {
s.Errorf("JetStream out of resources, will be DISABLED")
}
go s.DisableJetStream()
adv := &JSServerOutOfSpaceAdvisory{
TypedEvent: TypedEvent{
Type: JSServerOutOfStorageAdvisoryType,
ID: nuid.Next(),
Time: time.Now().UTC(),
},
Server: s.Name(),
ServerID: s.ID(),
Stream: stream,
Cluster: s.cachedClusterName(),
Domain: s.getOpts().JetStreamDomain,
}
s.publishAdvisory(nil, JSAdvisoryServerOutOfStorage, adv)
}
}
// DisableJetStream will turn off JetStream and signals in clustered mode
// to have the metacontroller remove us from the peer list.
func (s *Server) DisableJetStream() error {
if !s.JetStreamEnabled() {
return nil
}
s.setJetStreamDisabled()
if s.JetStreamIsClustered() {
isLeader := s.JetStreamIsLeader()
js, cc := s.getJetStreamCluster()
if js == nil {
s.shutdownJetStream()
return nil
}
js.mu.RLock()
meta := cc.meta
js.mu.RUnlock()
if meta != nil {
if isLeader {
s.Warnf("JetStream initiating meta leader transfer")
meta.StepDown()
select {
case <-s.quitCh:
return nil
case <-time.After(2 * time.Second):
}
if !s.JetStreamIsCurrent() {
s.Warnf("JetStream timeout waiting for meta leader transfer")
}
}
meta.Delete()
}
}
// Update our info status.
s.updateJetStreamInfoStatus(false)
// Normal shutdown.
s.shutdownJetStream()
return nil
}
func (s *Server) enableJetStreamAccounts() error {
// If we have no configured accounts setup then setup imports on global account.
if s.globalAccountOnly() {
gacc := s.GlobalAccount()
gacc.mu.Lock()
if len(gacc.jsLimits) == 0 {
gacc.jsLimits = defaultJSAccountTiers
}
gacc.mu.Unlock()
if err := s.configJetStream(gacc); err != nil {
return err
}
} else if err := s.configAllJetStreamAccounts(); err != nil {
return fmt.Errorf("Error enabling jetstream on configured accounts: %v", err)
}
return nil
}
// enableAllJetStreamServiceImportsAndMappings turns on all service imports and mappings for jetstream for this account.
func (a *Account) enableAllJetStreamServiceImportsAndMappings() error {
a.mu.RLock()
s := a.srv
a.mu.RUnlock()
if s == nil {
return fmt.Errorf("jetstream account not registered")
}
if !a.serviceImportExists(jsAllAPI) {
if err := a.AddServiceImport(s.SystemAccount(), jsAllAPI, _EMPTY_); err != nil {
return fmt.Errorf("Error setting up jetstream service imports for account: %v", err)
}
}
// Check if we have a Domain specified.
// If so add in a subject mapping that will allow local connected clients to reach us here as well.
if opts := s.getOpts(); opts.JetStreamDomain != _EMPTY_ {
mappings := generateJSMappingTable(opts.JetStreamDomain)
a.mu.RLock()
for _, m := range a.mappings {
delete(mappings, m.src)
}
a.mu.RUnlock()
for src, dest := range mappings {
if err := a.AddMapping(src, dest); err != nil {
s.Errorf("Error adding JetStream domain mapping: %v", err)
}
}
}
return nil
}
// enableJetStreamEnabledServiceImportOnly will enable the single service import responder.
// Should we do them all regardless?
func (a *Account) enableJetStreamInfoServiceImportOnly() error {
// Check if this import would be overshadowed. This can happen when accounts
// are importing from another account for JS access.
if a.serviceImportShadowed(JSApiAccountInfo) {
return nil
}
return a.enableAllJetStreamServiceImportsAndMappings()
}
func (s *Server) configJetStream(acc *Account) error {
if acc == nil {
return nil
}
acc.mu.RLock()
jsLimits := acc.jsLimits
acc.mu.RUnlock()
if jsLimits != nil {
// Check if already enabled. This can be during a reload.
if acc.JetStreamEnabled() {
if err := acc.enableAllJetStreamServiceImportsAndMappings(); err != nil {
return err
}
if err := acc.UpdateJetStreamLimits(jsLimits); err != nil {
return err
}
} else {
if err := acc.EnableJetStream(jsLimits); err != nil {
return err
}
if s.gateway.enabled {
s.switchAccountToInterestMode(acc.GetName())
}
}
} else if acc != s.SystemAccount() {
if acc.JetStreamEnabled() {
acc.DisableJetStream()
}
// We will setup basic service imports to respond to
// requests if JS is enabled for this account.
if err := acc.enableJetStreamInfoServiceImportOnly(); err != nil {
return err
}
}
return nil
}
// configAllJetStreamAccounts walk all configured accounts and turn on jetstream if requested.
func (s *Server) configAllJetStreamAccounts() error {
// Check to see if system account has been enabled. We could arrive here via reload and
// a non-default system account.
s.checkJetStreamExports()
// Snapshot into our own list. Might not be needed.
s.mu.Lock()
// Bail if server not enabled. If it was enabled and a reload turns it off
// that will be handled elsewhere.
js := s.js
if js == nil {
s.mu.Unlock()
return nil
}
if s.sys != nil {
// clustered stream removal will perform this cleanup as well
// this is mainly for initial cleanup
saccName := s.sys.account.Name
accStoreDirs, _ := os.ReadDir(js.config.StoreDir)
for _, acc := range accStoreDirs {
if accName := acc.Name(); accName != saccName {
// no op if not empty
accDir := filepath.Join(js.config.StoreDir, accName)
os.Remove(filepath.Join(accDir, streamsDir))
os.Remove(accDir)
}
}
}
var jsAccounts []*Account
s.accounts.Range(func(k, v interface{}) bool {
jsAccounts = append(jsAccounts, v.(*Account))
return true
})
accounts := &s.accounts
s.mu.Unlock()
// Process any jetstream enabled accounts here. These will be accounts we are
// already aware of at startup etc.
for _, acc := range jsAccounts {
if err := s.configJetStream(acc); err != nil {
return err
}
}
// Now walk all the storage we have and resolve any accounts that we did not process already.
// This is important in resolver/operator models.
fis, _ := os.ReadDir(js.config.StoreDir)
for _, fi := range fis {
if accName := fi.Name(); accName != _EMPTY_ {
// Only load up ones not already loaded since they are processed above.
if _, ok := accounts.Load(accName); !ok {
if acc, err := s.lookupAccount(accName); err != nil && acc != nil {
if err := s.configJetStream(acc); err != nil {
return err
}
}
}
}
}
return nil
}
// Mark our started time.
func (js *jetStream) setStarted() {
js.mu.Lock()
defer js.mu.Unlock()
js.started = time.Now()
}
func (js *jetStream) isEnabled() bool {
if js == nil {
return false
}
js.mu.RLock()
defer js.mu.RUnlock()
return !js.disabled
}
// Mark that we will be in standlone mode.
func (js *jetStream) setJetStreamStandAlone(isStandAlone bool) {
if js == nil {
return
}
js.mu.Lock()
defer js.mu.Unlock()
js.standAlone = isStandAlone
if isStandAlone {
js.accountPurge, _ = js.srv.systemSubscribe(JSApiAccountPurge, _EMPTY_, false, nil, js.srv.jsLeaderAccountPurgeRequest)
} else if js.accountPurge != nil {
js.srv.sysUnsubscribe(js.accountPurge)
}
}
// JetStreamEnabled reports if jetstream is enabled for this server.
func (s *Server) JetStreamEnabled() bool {
var js *jetStream
s.mu.Lock()
js = s.js
s.mu.Unlock()
return js.isEnabled()
}
// JetStreamEnabledForDomain will report if any servers have JetStream enabled within this domain.
func (s *Server) JetStreamEnabledForDomain() bool {
if s.JetStreamEnabled() {
return true
}
var jsFound bool
// If we are here we do not have JetStream enabled for ourselves, but we need to check all connected servers.
// TODO(dlc) - Could optimize and memoize this.
s.nodeToInfo.Range(func(k, v interface{}) bool {
// This should not be dependent on online status, so only check js.
if v.(nodeInfo).js {
jsFound = true
return false
}
return true
})
return jsFound
}
// Will signal that all pull requests for consumers on this server are now invalid.
func (s *Server) signalPullConsumers() {
js := s.getJetStream()
if js == nil {
return
}
js.mu.RLock()
defer js.mu.RUnlock()
// In case we have stale pending requests.
const hdr = "NATS/1.0 409 Server Shutdown\r\n" + JSPullRequestPendingMsgs + ": %d\r\n" + JSPullRequestPendingBytes + ": %d\r\n\r\n"
var didSend bool
for _, jsa := range js.accounts {
jsa.mu.RLock()
for _, stream := range jsa.streams {
stream.mu.RLock()
for _, o := range stream.consumers {
o.mu.RLock()
// Only signal on R1.
if o.cfg.Replicas <= 1 {
for reply, wr := range o.pendingRequests() {
shdr := fmt.Sprintf(hdr, wr.n, wr.b)
o.outq.send(newJSPubMsg(reply, _EMPTY_, _EMPTY_, []byte(shdr), nil, nil, 0))
didSend = true
}
}
o.mu.RUnlock()
}
stream.mu.RUnlock()
}
jsa.mu.RUnlock()
}
// Give time for migration information to make it out of our server.
if didSend {
time.Sleep(50 * time.Millisecond)
}
}
// Shutdown jetstream for this server.
func (s *Server) shutdownJetStream() {
s.mu.Lock()
js := s.js
s.mu.Unlock()
if js == nil {
return
}
s.Noticef("Initiating JetStream Shutdown...")
defer s.Noticef("JetStream Shutdown")
// If we have folks blocked on sync requests, unblock.
// Send 1 is enough, but use select in case they were all present.
select {
case s.syncOutSem <- struct{}{}:
default:
}
var _a [512]*Account
accounts := _a[:0]
js.mu.Lock()
// Collect accounts.
for _, jsa := range js.accounts {
if a := jsa.acc(); a != nil {
accounts = append(accounts, a)
}
}
accPurgeSub := js.accountPurge
js.accountPurge = nil
js.mu.Unlock()
if accPurgeSub != nil {
s.sysUnsubscribe(accPurgeSub)
}
for _, a := range accounts {
a.removeJetStream()
}
s.mu.Lock()
s.js = nil
s.mu.Unlock()
js.mu.Lock()
js.accounts = nil
var qch chan struct{}
if cc := js.cluster; cc != nil {
if cc.qch != nil {
qch = cc.qch
cc.qch = nil
}
js.stopUpdatesSub()
if cc.c != nil {
cc.c.closeConnection(ClientClosed)
cc.c = nil
}
cc.meta = nil
}
js.mu.Unlock()
// If we were clustered signal the monitor cluster go routine.
// We will wait for a bit for it to close.
// Do this without the lock.
if qch != nil {
select {
case qch <- struct{}{}:
select {
case <-qch:
case <-time.After(2 * time.Second):
s.Warnf("Did not receive signal for successful shutdown of cluster routine")
}
default:
}
}
}
// JetStreamConfig will return the current config. Useful if the system
// created a dynamic configuration. A copy is returned.
func (s *Server) JetStreamConfig() *JetStreamConfig {
var c *JetStreamConfig
s.mu.Lock()
if s.js != nil {
copy := s.js.config
c = &(copy)
}
s.mu.Unlock()
return c
}
func (s *Server) StoreDir() string {
s.mu.Lock()
defer s.mu.Unlock()
if s.js == nil {
return _EMPTY_
}
return s.js.config.StoreDir
}
// JetStreamNumAccounts returns the number of enabled accounts this server is tracking.
func (s *Server) JetStreamNumAccounts() int {
js := s.getJetStream()
if js == nil {
return 0
}
js.mu.Lock()
defer js.mu.Unlock()
return len(js.accounts)
}
// JetStreamReservedResources returns the reserved resources if JetStream is enabled.
func (s *Server) JetStreamReservedResources() (int64, int64, error) {
js := s.getJetStream()
if js == nil {
return -1, -1, NewJSNotEnabledForAccountError()
}
js.mu.RLock()
defer js.mu.RUnlock()
return js.memReserved, js.storeReserved, nil
}
func (s *Server) getJetStream() *jetStream {
s.mu.RLock()
js := s.js
s.mu.RUnlock()
return js
}
func (a *Account) assignJetStreamLimits(limits map[string]JetStreamAccountLimits) {
a.mu.Lock()
a.jsLimits = limits
a.mu.Unlock()
}
// EnableJetStream will enable JetStream on this account with the defined limits.
// This is a helper for JetStreamEnableAccount.
func (a *Account) EnableJetStream(limits map[string]JetStreamAccountLimits) error {
a.mu.RLock()
s := a.srv
a.mu.RUnlock()
if s == nil {
return fmt.Errorf("jetstream account not registered")