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service.go
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service.go
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package service
import (
"context"
"net"
"os"
"sync"
"time"
irodsfs_common_utils "github.com/cyverse/irodsfs-common/utils"
"github.com/cyverse/irodsfs-pool/commons"
"github.com/cyverse/irodsfs-pool/service/api"
log "github.com/sirupsen/logrus"
"golang.org/x/xerrors"
"google.golang.org/grpc"
"google.golang.org/grpc/stats"
)
// PoolService is a service object
type PoolService struct {
config *commons.Config
poolServer *PoolServer
grpcServer *grpc.Server
statHandler *PoolServiceStatHandler
terminateChan chan bool
}
type PoolServiceStatHandler struct {
poolServer *PoolServer
liveConnections int
mutex sync.Mutex
}
func (handler *PoolServiceStatHandler) TagRPC(context.Context, *stats.RPCTagInfo) context.Context {
return context.Background()
}
// HandleRPC processes the RPC stats.
func (handler *PoolServiceStatHandler) HandleRPC(context.Context, stats.RPCStats) {
}
func (handler *PoolServiceStatHandler) TagConn(context.Context, *stats.ConnTagInfo) context.Context {
return context.Background()
}
// HandleConn processes the Conn stats.
func (handler *PoolServiceStatHandler) HandleConn(c context.Context, s stats.ConnStats) {
logger := log.WithFields(log.Fields{
"package": "service",
"struct": "PoolServiceStatHandler",
"function": "HandleConn",
})
defer irodsfs_common_utils.StackTraceFromPanic(logger)
switch s.(type) {
case *stats.ConnEnd:
handler.mutex.Lock()
defer handler.mutex.Unlock()
handler.liveConnections--
promCounterForGRPCClients.Dec()
logger.Infof("Client is disconnected - total %d live connections", handler.liveConnections)
if handler.liveConnections <= 0 {
handler.liveConnections = 0
handler.poolServer.LogoutAll()
}
case *stats.ConnBegin:
handler.mutex.Lock()
defer handler.mutex.Unlock()
handler.liveConnections++
promCounterForGRPCClients.Inc()
logger.Infof("Client is connected - total %d connections", handler.liveConnections)
}
}
// NewPoolService creates a new pool service
func NewPoolService(config *commons.Config) (*PoolService, error) {
logger := log.WithFields(log.Fields{
"package": "service",
"function": "NewPoolService",
})
defer irodsfs_common_utils.StackTraceFromPanic(logger)
poolServerConfig := &PoolServerConfig{
CacheSizeMax: config.DataCacheSizeMax,
CacheRootPath: config.GetDataCacheRootDirPath(),
CacheTimeoutSettings: config.CacheTimeoutSettings,
}
poolServer, err := NewPoolServer(poolServerConfig)
if err != nil {
poolErr := xerrors.Errorf("failed to create a new pool server: %w", err)
logger.Errorf("%+v", poolErr)
return nil, err
}
statHandler := &PoolServiceStatHandler{
poolServer: poolServer,
liveConnections: 0,
}
grpcServer := grpc.NewServer(grpc.StatsHandler(statHandler))
api.RegisterPoolAPIServer(grpcServer, poolServer)
service := &PoolService{
config: config,
poolServer: poolServer,
grpcServer: grpcServer,
statHandler: statHandler,
terminateChan: make(chan bool),
}
return service, nil
}
// Release releases the service
func (svc *PoolService) Release() {
logger := log.WithFields(log.Fields{
"package": "service",
"struct": "PoolService",
"function": "Release",
})
logger.Info("Releasing the iRODS FUSE Lite Pool service")
defer irodsfs_common_utils.StackTraceFromPanic(logger)
if svc.grpcServer != nil {
svc.grpcServer = nil
}
if svc.poolServer != nil {
svc.poolServer.Release()
svc.poolServer = nil
}
scheme, endpoint, err := commons.ParsePoolServiceEndpoint(svc.config.GetServiceEndpoint())
if err == nil {
if scheme == "unix" {
os.Remove(endpoint)
}
}
}
// Start starts the service
func (svc *PoolService) Start() error {
logger := log.WithFields(log.Fields{
"package": "service",
"struct": "PoolService",
"function": "Start",
})
defer irodsfs_common_utils.StackTraceFromPanic(logger)
logger.Info("Starting the iRODS FUSE Lite Pool service")
var listener net.Listener
scheme, endpoint, err := commons.ParsePoolServiceEndpoint(svc.config.GetServiceEndpoint())
if err != nil {
logger.Errorf("%+v", err)
return err
}
switch scheme {
case "unix":
unixListener, err := net.Listen("unix", endpoint)
if err != nil {
listenErr := xerrors.Errorf("failed to listen to unix socket %q: %w", endpoint, err)
logger.Errorf("%+v", listenErr)
return listenErr
}
logger.Infof("Listening unix socket: %q", endpoint)
listener = unixListener
case "tcp":
tcpListener, err := net.Listen("tcp", endpoint)
if err != nil {
listenErr := xerrors.Errorf("failed to listen to tcp socket %q: %w", endpoint, err)
logger.Errorf("%+v", listenErr)
return listenErr
}
logger.Infof("Listening tcp socket: %q", endpoint)
listener = tcpListener
default:
logger.Errorf("unknown protocol %q", scheme)
return xerrors.Errorf("unknown protocol %q", scheme)
}
go func() {
logger := log.WithFields(log.Fields{
"package": "service",
"struct": "PoolService",
})
tickerConnDisplay := time.NewTicker(1 * time.Minute)
tickerMetricsCollection := time.NewTicker(5 * time.Second)
defer tickerConnDisplay.Stop()
defer tickerMetricsCollection.Stop()
for {
select {
case <-svc.terminateChan:
// terminate
return
case <-tickerConnDisplay.C:
logger.Infof("Total %d pool sessions, %d FS client instances, %d iRODS connections", svc.poolServer.GetPoolSessions(), svc.poolServer.GetIRODSFSClientInstances(), svc.poolServer.GetIRODSConnections())
case <-tickerMetricsCollection.C:
svc.poolServer.CollectPrometheusMetrics()
}
}
}()
go func() {
err = svc.grpcServer.Serve(listener)
if err != nil {
grpcServerErr := xerrors.Errorf("failed to serve: %w", err)
logger.Errorf("%+v", grpcServerErr)
}
}()
return nil
}
// Stop stops the service
func (svc *PoolService) Stop() {
logger := log.WithFields(log.Fields{
"package": "service",
"struct": "PoolService",
"function": "Destroy",
})
logger.Info("Stopping the iRODS FUSE Lite Pool service")
defer irodsfs_common_utils.StackTraceFromPanic(logger)
svc.terminateChan <- true
if svc.grpcServer != nil {
svc.grpcServer.Stop()
}
}