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create pkg/reuseport (#3455)

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* create pkg/reuseport

Move the core server listening functions to a new package so plugins can
use them.

Also make *all* servers use the functions here; as only the udp/tcp
listeners where using SO_REUSEPORT (if available). This is the only
actual change in this PR; in it's core it's just a move of 2 files.

This can also be used to cleanup the dance we're doing now for
re-acquiring the sockets in e.g. the metrics plugins and the ready
plugin.

Signed-off-by: Miek Gieben <miek@miek.nl>

* Also push a small doc update

Signed-off-by: Miek Gieben <miek@miek.nl>
This commit is contained in:
Miek Gieben
2019-11-17 02:02:46 +00:00
committed by Yong Tang
parent 4831e7f947
commit e14e053d3d
9 changed files with 64 additions and 49 deletions
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3
core/dnsserver/server_https.go
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@@ -12,6 +12,7 @@ import (
"github.com/coredns/coredns/plugin/pkg/dnsutil"
"github.com/coredns/coredns/plugin/pkg/doh"
"github.com/coredns/coredns/plugin/pkg/response"
"github.com/coredns/coredns/plugin/pkg/reuseport"
"github.com/coredns/coredns/plugin/pkg/transport"
)
@@ -61,7 +62,7 @@ func (s *ServerHTTPS) ServePacket(p net.PacketConn) error { return nil }
// Listen implements caddy.TCPServer interface.
func (s *ServerHTTPS) Listen() (net.Listener, error) {
l, err := net.Listen("tcp", s.Addr[len(transport.HTTPS+"://"):])
l, err := reuseport.Listen("tcp", s.Addr[len(transport.HTTPS+"://"):])
if err != nil {
return nil, err
}