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proxy.go
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proxy.go
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// Copyright 2016 CodisLabs. All Rights Reserved.
// Licensed under the MIT (MIT-LICENSE.txt) license.
package proxy
import (
"fmt"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"sync"
"time"
"github.com/CodisLabs/codis/pkg/models"
"github.com/CodisLabs/codis/pkg/utils"
"github.com/CodisLabs/codis/pkg/utils/errors"
"github.com/CodisLabs/codis/pkg/utils/log"
"github.com/CodisLabs/codis/pkg/utils/math2"
"github.com/CodisLabs/codis/pkg/utils/redis"
"github.com/CodisLabs/codis/pkg/utils/rpc"
"github.com/CodisLabs/codis/pkg/utils/unsafe2"
)
type Proxy struct {
mu sync.Mutex
token string
xauth string
model *models.Proxy
exit struct {
C chan struct{}
}
online bool
closed bool
config *Config
router *Router
ignore []byte
lproxy net.Listener
ladmin net.Listener
xjodis *Jodis
ha struct {
monitor *redis.Sentinel
masters map[int]string
servers []string
}
}
var ErrClosedProxy = errors.New("use of closed proxy")
func New(config *Config) (*Proxy, error) {
if err := config.Validate(); err != nil {
return nil, errors.Trace(err)
}
if err := models.ValidateProduct(config.ProductName); err != nil {
return nil, errors.Trace(err)
}
s := &Proxy{}
s.config = config
s.exit.C = make(chan struct{})
s.router = NewRouter(config)
s.ignore = make([]byte, config.ProxyHeapPlaceholder.Int())
s.model = &models.Proxy{
StartTime: time.Now().String(),
}
s.model.ProductName = config.ProductName
s.model.DataCenter = config.ProxyDataCenter
s.model.Pid = os.Getpid()
s.model.Pwd, _ = os.Getwd()
if b, err := exec.Command("uname", "-a").Output(); err != nil {
log.WarnErrorf(err, "run command uname failed")
} else {
s.model.Sys = strings.TrimSpace(string(b))
}
s.model.Hostname = utils.Hostname
if err := s.setup(config); err != nil {
s.Close()
return nil, err
}
log.Warnf("[%p] create new proxy:\n%s", s, s.model.Encode())
unsafe2.SetMaxOffheapBytes(config.ProxyMaxOffheapBytes.Int())
go s.serveAdmin()
go s.serveProxy()
s.startMetricsJson()
s.startMetricsInfluxdb()
return s, nil
}
func (s *Proxy) setup(config *Config) error {
proto := config.ProtoType
if l, err := net.Listen(proto, config.ProxyAddr); err != nil {
return errors.Trace(err)
} else {
s.lproxy = l
x, err := utils.ReplaceUnspecifiedIP(proto, l.Addr().String(), config.HostProxy)
if err != nil {
return err
}
s.model.ProtoType = proto
s.model.ProxyAddr = x
}
proto = "tcp"
if l, err := net.Listen(proto, config.AdminAddr); err != nil {
return errors.Trace(err)
} else {
s.ladmin = l
x, err := utils.ReplaceUnspecifiedIP(proto, l.Addr().String(), config.HostAdmin)
if err != nil {
return err
}
s.model.AdminAddr = x
}
s.model.Token = rpc.NewToken(
config.ProductName,
s.lproxy.Addr().String(),
s.ladmin.Addr().String(),
)
s.xauth = rpc.NewXAuth(
config.ProductName,
config.ProductAuth,
s.model.Token,
)
if config.JodisAddr != "" {
c, err := models.NewClient(config.JodisName, config.JodisAddr, config.JodisTimeout.Get())
if err != nil {
return err
}
if config.JodisCompatible {
s.model.JodisPath = filepath.Join("/zk/codis", fmt.Sprintf("db_%s", config.ProductName), "proxy", s.model.Token)
} else {
s.model.JodisPath = models.JodisPath(config.ProductName, s.model.Token)
}
s.xjodis = NewJodis(c, s.model)
}
return nil
}
func (s *Proxy) Start() error {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed {
return ErrClosedProxy
}
if s.online {
return nil
}
s.online = true
s.router.Start()
return nil
}
func (s *Proxy) Close() error {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed {
return nil
}
s.closed = true
close(s.exit.C)
if s.xjodis != nil {
s.xjodis.Close()
}
if s.ladmin != nil {
s.ladmin.Close()
}
if s.lproxy != nil {
s.lproxy.Close()
}
if s.router != nil {
s.router.Close()
}
if s.ha.monitor != nil {
s.ha.monitor.Cancel()
}
return nil
}
func (s *Proxy) XAuth() string {
return s.xauth
}
func (s *Proxy) Model() *models.Proxy {
return s.model
}
func (s *Proxy) Config() *Config {
return s.config
}
func (s *Proxy) IsOnline() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.online && !s.closed
}
func (s *Proxy) IsClosed() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.closed
}
func (s *Proxy) HasSwitched() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.router.HasSwitched()
}
func (s *Proxy) Slots() []*models.Slot {
s.mu.Lock()
defer s.mu.Unlock()
return s.router.GetSlots()
}
func (s *Proxy) FillSlot(m *models.Slot) error {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed {
return ErrClosedProxy
}
return s.router.FillSlot(m)
}
func (s *Proxy) FillSlots(slots []*models.Slot) error {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed {
return ErrClosedProxy
}
for _, m := range slots {
if err := s.router.FillSlot(m); err != nil {
return err
}
}
return nil
}
func (s *Proxy) SwitchMasters(masters map[int]string) error {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed {
return ErrClosedProxy
}
s.ha.masters = masters
if len(masters) != 0 {
s.router.SwitchMasters(masters)
}
return nil
}
func (s *Proxy) GetSentinels() ([]string, map[int]string) {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed {
return nil, nil
}
return s.ha.servers, s.ha.masters
}
func (s *Proxy) SetSentinels(servers []string) error {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed {
return ErrClosedProxy
}
s.ha.servers = servers
log.Warnf("[%p] set sentinels = %v", s, s.ha.servers)
s.rewatchSentinels(s.ha.servers)
return nil
}
func (s *Proxy) RewatchSentinels() error {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed {
return ErrClosedProxy
}
log.Warnf("[%p] rewatch sentinels = %v", s, s.ha.servers)
s.rewatchSentinels(s.ha.servers)
return nil
}
func (s *Proxy) rewatchSentinels(servers []string) {
if s.ha.monitor != nil {
s.ha.monitor.Cancel()
s.ha.monitor = nil
s.ha.masters = nil
}
if len(servers) != 0 {
s.ha.monitor = redis.NewSentinel(s.config.ProductName, s.config.ProductAuth)
s.ha.monitor.LogFunc = log.Warnf
s.ha.monitor.ErrFunc = log.WarnErrorf
go func(p *redis.Sentinel) {
var trigger = make(chan struct{}, 1)
delayUntil := func(deadline time.Time) {
for !p.IsCanceled() {
var d = deadline.Sub(time.Now())
if d <= 0 {
return
}
time.Sleep(math2.MinDuration(d, time.Second))
}
}
go func() {
defer close(trigger)
callback := func() {
select {
case trigger <- struct{}{}:
default:
}
}
for !p.IsCanceled() {
timeout := time.Minute * 15
retryAt := time.Now().Add(time.Second * 10)
if !p.Subscribe(timeout, callback, servers...) {
delayUntil(retryAt)
} else {
callback()
}
}
}()
go func() {
for _ = range trigger {
var success int
for i := 0; i != 10 && !p.IsCanceled() && success != 2; i++ {
timeout := time.Second * 5
masters, err := p.Masters(s.router.GetGroupIds(), timeout, servers...)
if err != nil {
log.WarnErrorf(err, "[%p] fetch group masters failed", s)
} else {
if !p.IsCanceled() {
s.SwitchMasters(masters)
}
success += 1
}
delayUntil(time.Now().Add(time.Second * 5))
}
}
}()
}(s.ha.monitor)
}
}
func (s *Proxy) serveAdmin() {
if s.IsClosed() {
return
}
defer s.Close()
log.Warnf("[%p] admin start service on %s", s, s.ladmin.Addr())
eh := make(chan error, 1)
go func(l net.Listener) {
h := http.NewServeMux()
h.Handle("/", newApiServer(s))
hs := &http.Server{Handler: h}
eh <- hs.Serve(l)
}(s.ladmin)
select {
case <-s.exit.C:
log.Warnf("[%p] admin shutdown", s)
case err := <-eh:
log.ErrorErrorf(err, "[%p] admin exit on error", s)
}
}
func (s *Proxy) serveProxy() {
if s.IsClosed() {
return
}
defer s.Close()
log.Warnf("[%p] proxy start service on %s", s, s.lproxy.Addr())
eh := make(chan error, 1)
go func(l net.Listener) (err error) {
defer func() {
eh <- err
}()
for {
c, err := s.acceptConn(l)
if err != nil {
return err
}
NewSession(c, s.config).Start(s.router)
}
}(s.lproxy)
if d := s.config.BackendPingPeriod; d != 0 {
go s.keepAlive(d.Get())
}
if s.xjodis != nil {
s.xjodis.Start()
}
select {
case <-s.exit.C:
log.Warnf("[%p] proxy shutdown", s)
case err := <-eh:
log.ErrorErrorf(err, "[%p] proxy exit on error", s)
}
}
func (s *Proxy) keepAlive(d time.Duration) {
var ticker = time.NewTicker(math2.MaxDuration(d, time.Second))
defer ticker.Stop()
for {
select {
case <-s.exit.C:
return
case <-ticker.C:
s.router.KeepAlive()
}
}
}
func (s *Proxy) acceptConn(l net.Listener) (net.Conn, error) {
var delay = &DelayExp2{
Min: 10, Max: 500,
Unit: time.Millisecond,
}
for {
c, err := l.Accept()
if err != nil {
if e, ok := err.(net.Error); ok && e.Temporary() {
log.WarnErrorf(err, "[%p] proxy accept new connection failed", s)
delay.Sleep()
continue
}
}
return c, err
}
}
type Overview struct {
Version string `json:"version"`
Compile string `json:"compile"`
Config *Config `json:"config,omitempty"`
Model *models.Proxy `json:"model,omitempty"`
Stats *Stats `json:"stats,omitempty"`
Slots []*models.Slot `json:"slots,omitempty"`
}
type Stats struct {
Online bool `json:"online"`
Closed bool `json:"closed"`
Sentinels struct {
Servers []string `json:"servers,omitempty"`
Masters map[string]string `json:"masters,omitempty"`
Switched bool `json:"switched,omitempty"`
} `json:"sentinels"`
Ops struct {
Total int64 `json:"total"`
Fails int64 `json:"fails"`
Redis struct {
Errors int64 `json:"errors"`
} `json:"redis"`
QPS int64 `json:"qps"`
Cmd []*OpStats `json:"cmd,omitempty"`
} `json:"ops"`
Sessions struct {
Total int64 `json:"total"`
Alive int64 `json:"alive"`
} `json:"sessions"`
Rusage struct {
Now string `json:"now"`
CPU float64 `json:"cpu"`
Mem int64 `json:"mem"`
Raw *utils.Usage `json:"raw,omitempty"`
} `json:"rusage"`
Backend struct {
PrimaryOnly bool `json:"primary_only"`
} `json:"backend"`
Runtime *RuntimeStats `json:"runtime,omitempty"`
}
type RuntimeStats struct {
General struct {
Alloc uint64 `json:"alloc"`
Sys uint64 `json:"sys"`
Lookups uint64 `json:"lookups"`
Mallocs uint64 `json:"mallocs"`
Frees uint64 `json:"frees"`
} `json:"general"`
Heap struct {
Alloc uint64 `json:"alloc"`
Sys uint64 `json:"sys"`
Idle uint64 `json:"idle"`
Inuse uint64 `json:"inuse"`
Objects uint64 `json:"objects"`
} `json:"heap"`
GC struct {
Num uint32 `json:"num"`
CPUFraction float64 `json:"cpu_fraction"`
TotalPauseMs uint64 `json:"total_pausems"`
} `json:"gc"`
NumProcs int `json:"num_procs"`
NumGoroutines int `json:"num_goroutines"`
NumCgoCall int64 `json:"num_cgo_call"`
MemOffheap int `json:"mem_offheap"`
}
type StatsFlags uint32
func (s StatsFlags) HasBit(m StatsFlags) bool {
return (s & m) != 0
}
const (
StatsCmds = StatsFlags(1 << iota)
StatsSlots
StatsRuntime
StatsFull = StatsFlags(^uint32(0))
)
func (s *Proxy) Overview(flags StatsFlags) *Overview {
o := &Overview{
Version: utils.Version,
Compile: utils.Compile,
Config: s.Config(),
Model: s.Model(),
Stats: s.Stats(flags),
}
if flags.HasBit(StatsSlots) {
o.Slots = s.Slots()
}
return o
}
func (s *Proxy) Stats(flags StatsFlags) *Stats {
stats := &Stats{}
stats.Online = s.IsOnline()
stats.Closed = s.IsClosed()
servers, masters := s.GetSentinels()
if servers != nil {
stats.Sentinels.Servers = servers
}
if masters != nil {
stats.Sentinels.Masters = make(map[string]string)
for gid, addr := range masters {
stats.Sentinels.Masters[strconv.Itoa(gid)] = addr
}
}
stats.Sentinels.Switched = s.HasSwitched()
stats.Ops.Total = OpTotal()
stats.Ops.Fails = OpFails()
stats.Ops.Redis.Errors = OpRedisErrors()
stats.Ops.QPS = OpQPS()
if flags.HasBit(StatsCmds) {
stats.Ops.Cmd = GetOpStatsAll()
}
stats.Sessions.Total = SessionsTotal()
stats.Sessions.Alive = SessionsAlive()
if u := GetSysUsage(); u != nil {
stats.Rusage.Now = u.Now.String()
stats.Rusage.CPU = u.CPU
stats.Rusage.Mem = u.MemTotal()
stats.Rusage.Raw = u.Usage
}
stats.Backend.PrimaryOnly = s.Config().BackendPrimaryOnly
if flags.HasBit(StatsRuntime) {
var r runtime.MemStats
runtime.ReadMemStats(&r)
stats.Runtime = &RuntimeStats{}
stats.Runtime.General.Alloc = r.Alloc
stats.Runtime.General.Sys = r.Sys
stats.Runtime.General.Lookups = r.Lookups
stats.Runtime.General.Mallocs = r.Mallocs
stats.Runtime.General.Frees = r.Frees
stats.Runtime.Heap.Alloc = r.HeapAlloc
stats.Runtime.Heap.Sys = r.HeapSys
stats.Runtime.Heap.Idle = r.HeapIdle
stats.Runtime.Heap.Inuse = r.HeapInuse
stats.Runtime.Heap.Objects = r.HeapObjects
stats.Runtime.GC.Num = r.NumGC
stats.Runtime.GC.CPUFraction = r.GCCPUFraction
stats.Runtime.GC.TotalPauseMs = r.PauseTotalNs / uint64(time.Millisecond)
stats.Runtime.NumProcs = runtime.GOMAXPROCS(0)
stats.Runtime.NumGoroutines = runtime.NumGoroutine()
stats.Runtime.NumCgoCall = runtime.NumCgoCall()
stats.Runtime.MemOffheap = unsafe2.OffheapBytes()
}
return stats
}