forked from utrack/clay
/
listeners.go
61 lines (52 loc) · 1.32 KB
/
listeners.go
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package server
import (
"net"
"strconv"
"time"
"github.com/pkg/errors"
"github.com/soheilhy/cmux"
)
const (
listenRetryWait = 500 * time.Millisecond
listenRetryDuration = 10 * time.Second
)
type listenerSet struct {
mainListener cmux.CMux // nil or CMux. If nil - don't listen
HTTP net.Listener
GRPC net.Listener
}
func newListenerSet(opts *serverOpts) (*listenerSet, error) {
liSet := &listenerSet{}
var err error
liSet.GRPC, err = newListener(opts.RPCPort)
if err != nil {
return nil, errors.Wrap(err, "couldn't create main listener")
}
if opts.RPCPort == opts.HTTPPort {
mux := cmux.New(liSet.GRPC)
liSet.GRPC = mux.Match(cmux.HTTP2())
liSet.HTTP = mux.Match(cmux.Any())
liSet.mainListener = mux
} else {
liSet.HTTP, err = newListener(opts.HTTPPort)
}
if err != nil {
return nil, errors.Wrap(err, "couldn't create HTTP listener")
}
return liSet, nil
}
// newListener start net.Listener on a port.
// It keeps retrying if port is already in use.
func newListener(port int) (net.Listener, error) {
var listener net.Listener
var err error
start := time.Now()
for time.Since(start) < listenRetryDuration {
listener, err = net.Listen("tcp", net.JoinHostPort("", strconv.Itoa(port)))
if err == nil {
return listener, nil
}
time.Sleep(listenRetryWait)
}
return nil, err
}