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service.go
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service.go
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package daemon
import (
"net/rpc"
"os"
"os/signal"
"sync"
"syscall"
"github.com/elves/elvish/store"
"github.com/elves/elvish/store/storedefs"
)
// Serve runs the daemon service, listening on the socket specified by sockpath
// and serving data from dbpath. It quits upon receiving SIGTERM, SIGINT or when
// all active clients have disconnected.
func Serve(sockpath, dbpath string) {
logger.Println("pid is", syscall.Getpid())
logger.Println("going to listen", sockpath)
listener, err := listen(sockpath)
if err != nil {
logger.Printf("failed to listen on %s: %v", sockpath, err)
logger.Println("aborting")
os.Exit(2)
}
st, err := store.NewStore(dbpath)
if err != nil {
logger.Printf("failed to create storage: %v", err)
logger.Printf("serving anyway")
}
quitSignals := make(chan os.Signal)
quitChan := make(chan struct{})
signal.Notify(quitSignals, syscall.SIGTERM, syscall.SIGINT)
go func() {
select {
case sig := <-quitSignals:
logger.Printf("received signal %s", sig)
case <-quitChan:
logger.Printf("No active client, daemon exit")
}
err := os.Remove(sockpath)
if err != nil {
logger.Printf("failed to remove socket %s: %v", sockpath, err)
}
err = st.Close()
if err != nil {
logger.Printf("failed to close storage: %v", err)
}
err = listener.Close()
if err != nil {
logger.Printf("failed to close listener: %v", err)
}
logger.Println("listener closed, waiting to exit")
}()
service := &Service{st, err}
rpc.RegisterName(ServiceName, service)
logger.Println("starting to serve RPC calls")
firstClient := true
activeClient := sync.WaitGroup{}
// prevent daemon exit before serving first client
activeClient.Add(1)
go func() {
activeClient.Wait()
close(quitChan)
}()
for {
conn, err := listener.Accept()
if err != nil {
logger.Printf("Failed to accept: %#v", err)
break
}
if firstClient {
firstClient = false
} else {
activeClient.Add(1)
}
go func() {
rpc.DefaultServer.ServeConn(conn)
activeClient.Done()
}()
}
logger.Println("exiting")
}
// Service provides the daemon RPC service. It is suitable as a service for
// net/rpc.
type Service struct {
store storedefs.Store
err error
}
// Implementations of RPC methods.
// Version returns the API version number.
func (s *Service) Version(req *VersionRequest, res *VersionResponse) error {
if s.err != nil {
return s.err
}
res.Version = Version
return nil
}
// Pid returns the process ID of the daemon.
func (s *Service) Pid(req *PidRequest, res *PidResponse) error {
res.Pid = syscall.Getpid()
return nil
}
func (s *Service) NextCmdSeq(req *NextCmdSeqRequest, res *NextCmdSeqResponse) error {
if s.err != nil {
return s.err
}
seq, err := s.store.NextCmdSeq()
res.Seq = seq
return err
}
func (s *Service) AddCmd(req *AddCmdRequest, res *AddCmdResponse) error {
if s.err != nil {
return s.err
}
seq, err := s.store.AddCmd(req.Text)
res.Seq = seq
return err
}
func (s *Service) DelCmd(req *DelCmdRequest, res *DelCmdResponse) error {
if s.err != nil {
return s.err
}
err := s.store.DelCmd(req.Seq)
return err
}
func (s *Service) Cmd(req *CmdRequest, res *CmdResponse) error {
if s.err != nil {
return s.err
}
text, err := s.store.Cmd(req.Seq)
res.Text = text
return err
}
func (s *Service) Cmds(req *CmdsRequest, res *CmdsResponse) error {
if s.err != nil {
return s.err
}
cmds, err := s.store.Cmds(req.From, req.Upto)
res.Cmds = cmds
return err
}
func (s *Service) NextCmd(req *NextCmdRequest, res *NextCmdResponse) error {
if s.err != nil {
return s.err
}
seq, text, err := s.store.NextCmd(req.From, req.Prefix)
res.Seq, res.Text = seq, text
return err
}
func (s *Service) PrevCmd(req *PrevCmdRequest, res *PrevCmdResponse) error {
if s.err != nil {
return s.err
}
seq, text, err := s.store.PrevCmd(req.Upto, req.Prefix)
res.Seq, res.Text = seq, text
return err
}
func (s *Service) AddDir(req *AddDirRequest, res *AddDirResponse) error {
if s.err != nil {
return s.err
}
return s.store.AddDir(req.Dir, req.IncFactor)
}
func (s *Service) DelDir(req *DelDirRequest, res *DelDirResponse) error {
if s.err != nil {
return s.err
}
return s.store.DelDir(req.Dir)
}
func (s *Service) Dirs(req *DirsRequest, res *DirsResponse) error {
if s.err != nil {
return s.err
}
dirs, err := s.store.Dirs(req.Blacklist)
res.Dirs = dirs
return err
}
func (s *Service) SharedVar(req *SharedVarRequest, res *SharedVarResponse) error {
if s.err != nil {
return s.err
}
value, err := s.store.SharedVar(req.Name)
res.Value = value
return err
}
func (s *Service) SetSharedVar(req *SetSharedVarRequest, res *SetSharedVarResponse) error {
if s.err != nil {
return s.err
}
return s.store.SetSharedVar(req.Name, req.Value)
}
func (s *Service) DelSharedVar(req *DelSharedVarRequest, res *DelSharedVarResponse) error {
if s.err != nil {
return s.err
}
return s.store.DelSharedVar(req.Name)
}