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server.go
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server.go
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// Copyright (c) 2023 Paweł Gaczyński
//
// 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 gain
import (
"fmt"
"log"
"os"
"os/signal"
"sync"
"sync/atomic"
"syscall"
"github.com/pawelgaczynski/gain/logger"
gainErrors "github.com/pawelgaczynski/gain/pkg/errors"
gainNet "github.com/pawelgaczynski/gain/pkg/net"
"github.com/pawelgaczynski/giouring"
"github.com/rs/zerolog"
)
const (
inactive uint32 = iota
starting
running
closing
)
type Server interface {
// Start starts a server that will listen on the specified address and
// waits for SIGTERM or SIGINT signals to close the server.
StartAsMainProcess(address string) error
// Start starts a server that will listen on the specified address.
Start(address string) error
// Shutdown closes all connections and shuts down server. It's blocking until the server shuts down.
Shutdown()
// AsyncShutdown closes all connections and shuts down server in asynchronous manner.
// It does not wait for the server shutdown to complete.
AsyncShutdown()
// ActiveConnections returns the number of active connections.
ActiveConnections() int
// IsRunning returns true if server is running and handling requests.
IsRunning() bool
}
type engine struct {
config Config
network string
address string
closer func() error
closeChan chan closeSignal
closeBackChan chan bool
state atomic.Uint32
logger zerolog.Logger
eventHandler EventHandler
readWriteWorkers sync.Map
}
type closeSignal int
const (
system closeSignal = iota
user
)
func (e *engine) startConsumers(startedWg, doneWg *sync.WaitGroup) {
numberOfWorkers := int32(e.config.Workers)
e.readWriteWorkers.Range(func(key any, value any) bool {
var index int
var worker *consumerWorker
var ok bool
if index, ok = key.(int); !ok {
return false
}
if worker, ok = value.(*consumerWorker); !ok {
return false
}
startedWg.Add(1)
doneWg.Add(1)
go func(cWorker *consumerWorker) {
err := cWorker.loop(0)
if err != nil {
e.handleWorkerStop(index, &numberOfWorkers, err, startedWg, *cWorker.readWriteWorkerImpl)
}
doneWg.Done()
}(worker)
<-worker.startedChan
return true
})
}
func (e *engine) handleWorkerStop(
index int, numberOfWorkers *int32, err error, startedWg *sync.WaitGroup, worker readWriteWorkerImpl,
) {
atomic.AddInt32(numberOfWorkers, -1)
livingWorkers := atomic.LoadInt32(numberOfWorkers)
e.logger.Error().Err(err).Int32("living workers", livingWorkers).Int("worker index", index).Msg("Worker died...")
if !worker.started() {
startedWg.Done()
}
e.readWriteWorkers.Delete(index)
}
func (e *engine) startReactor(listener *listener, features supportedFeatures) error {
var doneWg, startedWg sync.WaitGroup
lb, err := createLoadBalancer(e.config.LoadBalancing)
if err != nil {
return err
}
acceptor, err := newAcceptorWorker(acceptorWorkerConfig{
workerConfig: workerConfig{
cpuAffinity: e.config.CPUAffinity,
processPriority: e.config.ProcessPriority,
maxCQEvents: int(e.config.MaxCQEvents),
loggerLevel: e.config.LoggerLevel,
prettyLogger: e.config.PrettyLogger,
maxSQEntries: e.config.MaxSQEntries,
},
tcpKeepAlive: e.config.TCPKeepAlive,
}, lb, e.eventHandler, features)
if err != nil {
return err
}
acceptor.startListener = func() {
startedWg.Done()
}
for i := 0; i < e.config.Workers; i++ {
var consumer *consumerWorker
consumer, err = newConsumerWorker(i+1, listener.addr, consumerConfig{
readWriteWorkerConfig: readWriteWorkerConfig{
workerConfig: workerConfig{
cpuAffinity: e.config.CPUAffinity,
maxCQEvents: int(e.config.MaxCQEvents),
loggerLevel: e.config.LoggerLevel,
prettyLogger: e.config.PrettyLogger,
maxSQEntries: e.config.MaxSQEntries,
},
asyncHandler: e.config.AsyncHandler,
goroutinePool: e.config.GoroutinePool,
},
}, e.eventHandler, features)
if err != nil {
return err
}
consumer.startListener = func() {
startedWg.Done()
}
acceptor.registerConsumer(consumer)
e.readWriteWorkers.Store(i, consumer)
}
e.closer = func() error {
acceptor.shutdown()
return nil
}
e.startConsumers(&startedWg, &doneWg)
startedWg.Add(1)
doneWg.Add(1)
go func(acceptor *acceptorWorker) {
err = acceptor.loop(listener.fd)
if err != nil {
log.Panic(err)
}
doneWg.Done()
}(acceptor)
startedWg.Wait()
e.state.Store(running)
e.eventHandler.OnStart(e)
doneWg.Wait()
return nil
}
func (e *engine) startSocketSharding(listeners []*listener, protocol string) error {
var (
doneWg sync.WaitGroup
startedWg sync.WaitGroup
)
for i := 0; i < e.config.Workers; i++ {
shardWorker, err := newShardWorker(i, listeners[i].addr, shardWorkerConfig{
readWriteWorkerConfig: readWriteWorkerConfig{
workerConfig: workerConfig{
cpuAffinity: e.config.CPUAffinity,
maxCQEvents: int(e.config.MaxCQEvents),
loggerLevel: e.config.LoggerLevel,
prettyLogger: e.config.PrettyLogger,
maxSQEntries: e.config.MaxSQEntries,
},
asyncHandler: e.config.AsyncHandler,
goroutinePool: e.config.GoroutinePool,
sendRecvMsg: protocol == gainNet.UDP,
},
tcpKeepAlive: e.config.TCPKeepAlive,
}, e.eventHandler)
if err != nil {
return err
}
shardWorker.startListener = func() {
startedWg.Done()
}
e.readWriteWorkers.Store(i, shardWorker)
}
e.closer = func() error {
e.readWriteWorkers.Range(func(key any, value any) bool {
var worker *shardWorker
var ok bool
if worker, ok = value.(*shardWorker); !ok {
return false
}
worker.shutdown()
e.logger.Warn().Msgf("Worker %d closed", worker.index())
return true
})
return nil
}
numberOfWorkers := int32(e.config.Workers)
e.readWriteWorkers.Range(func(key any, value any) bool {
var index int
var worker *shardWorker
var ok bool
if index, ok = key.(int); !ok {
return false
}
if worker, ok = value.(*shardWorker); !ok {
return false
}
startedWg.Add(1)
doneWg.Add(1)
go func(sWorker *shardWorker) {
err := sWorker.loop(listeners[index].fd)
if err != nil {
e.handleWorkerStop(index, &numberOfWorkers, err, &startedWg, *sWorker.readWriteWorkerImpl)
}
doneWg.Done()
}(worker)
<-worker.startedChan
return true
})
startedWg.Wait()
e.state.Store(running)
e.eventHandler.OnStart(e)
doneWg.Wait()
return nil
}
func (e *engine) start(mainProcess bool, address string) error {
if state := e.state.Load(); state != inactive {
return gainErrors.ErrInvalidState
}
e.state.Store(starting)
var (
err error
features = supportedFeatures{}
)
probe, err := giouring.GetProbe()
if err != nil {
return fmt.Errorf("getProbe err: %w", err)
}
features.ringsMessaging = probe.IsSupported(giouring.OpMsgRing)
if mainProcess {
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
go func() {
<-sigs
e.closeChan <- system
}()
}
go func() {
closeSig := <-e.closeChan
closeErr := e.closer()
if closeErr != nil {
e.logger.Error().Err(closeErr).Msg("Closing server error")
}
e.state.Store(inactive)
e.closeBackChan <- true
if closeSig == system {
os.Exit(0)
}
}()
e.network, e.address = parseProtoAddr(address)
if e.config.Architecture == SocketSharding || e.network == gainNet.UDP {
listeners := make([]*listener, e.config.Workers)
for i := 0; i < len(listeners); i++ {
var listener *listener
listener, err = initListener(e.network, e.address, e.config)
if err != nil {
return err
}
listeners[i] = listener
}
return e.startSocketSharding(listeners, e.network)
}
listener, err := initListener(e.network, e.address, e.config)
if err != nil {
return err
}
return e.startReactor(listener, features)
}
func (e *engine) StartAsMainProcess(address string) error {
if e.IsRunning() {
return gainErrors.ErrServerAlreadyRunning
}
return e.start(true, address)
}
func (e *engine) Start(address string) error {
if e.IsRunning() {
return gainErrors.ErrServerAlreadyRunning
}
return e.start(false, address)
}
func (e *engine) Shutdown() {
if state := e.state.Load(); state == running {
e.state.Store(closing)
e.closeChan <- user
<-e.closeBackChan
}
}
func (e *engine) AsyncShutdown() {
if state := e.state.Load(); state == running {
e.state.Store(closing)
e.closeChan <- user
}
}
func (e *engine) ActiveConnections() int {
connections := 0
e.readWriteWorkers.Range(func(key any, value any) bool {
if worker, ok := value.(readWriteWorker); ok {
connections += worker.activeConnections()
return true
}
return false
})
return connections
}
func (e *engine) IsRunning() bool {
return e.state.Load() == running
}
func NewServer(eventHandler EventHandler, config Config) Server {
return &engine{
config: config,
logger: logger.NewLogger("server", config.LoggerLevel, config.PrettyLogger),
eventHandler: eventHandler,
closeChan: make(chan closeSignal),
closeBackChan: make(chan bool),
}
}