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server: fix data race (#536)

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* server: fix data race

This fixes the detected race.

Fixes #534

* Remove the listener and packetconn from Server

There does not seem a need to store the listener and packetconn again
in the Server structure. The dns.Servers already has access to them
and can also shutdown the handlers.
This commit is contained in:
Miek Gieben 2017-02-19 20:34:09 +00:00 • committed by GitHub
parent 5aa30308d9
commit bcd9c8b0fb
1 changed files with 4 additions and 19 deletions
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23
core/dnsserver/server.go
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@ -25,13 +25,11 @@ import (
// the same address and the listener may be stopped for
// graceful termination (POSIX only).
type Server struct {
Addr string // Address we listen on
mux *dns.ServeMux
server [2]*dns.Server // 0 is a net.Listener, 1 is a net.PacketConn (a *UDPConn) in our case.
Addr string // Address we listen on
mux *dns.ServeMux
l net.Listener
p net.PacketConn
m sync.Mutex // protects listener and packetconn
server [2]*dns.Server // 0 is a net.Listener, 1 is a net.PacketConn (a *UDPConn) in our case.
m sync.Mutex // protects the servers
zones map[string]*Config // zones keyed by their address
dnsWg sync.WaitGroup // used to wait on outstanding connections
@ -99,9 +97,6 @@ func (s *Server) Listen() (net.Listener, error) {
if err != nil {
return nil, err
}
s.m.Lock()
s.l = l
s.m.Unlock()
return l, nil
}
@ -112,9 +107,6 @@ func (s *Server) ListenPacket() (net.PacketConn, error) {
return nil, err
}
s.m.Lock()
s.p = p
s.m.Unlock()
return p, nil
}
@ -145,13 +137,6 @@ func (s *Server) Stop() (err error) {
// Close the listener now; this stops the server without delay
s.m.Lock()
if s.l != nil {
err = s.l.Close()
}
if s.p != nil {
err = s.p.Close()
}
for _, s1 := range s.server {
// We might not have started and initialized the full set of servers
if s1 != nil {