From ff37cc455c0248f327d887a3f7318ab993c4f015 Mon Sep 17 00:00:00 2001
From: Xiang Li <xiangli.cs@gmail.com>
Date: Thu, 20 Aug 2015 20:03:27 -0700
Subject: [PATCH] pkg/transport: remove home-grown limitedListener

---
 pkg/transport/limited_conn_listener.go      | 55 --------------
 pkg/transport/limited_conn_listener_test.go | 79 ---------------------
 2 files changed, 134 deletions(-)
 delete mode 100644 pkg/transport/limited_conn_listener.go
 delete mode 100644 pkg/transport/limited_conn_listener_test.go

diff --git a/pkg/transport/limited_conn_listener.go b/pkg/transport/limited_conn_listener.go
deleted file mode 100644
index 0cbe88e22..000000000
--- a/pkg/transport/limited_conn_listener.go
+++ /dev/null
@@ -1,55 +0,0 @@
-// Copyright 2015 CoreOS, Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package transport
-
-import (
-	"errors"
-	"net"
-
-	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/pkg/capnslog"
-	"github.com/coreos/etcd/pkg/runtime"
-)
-
-var plog = capnslog.NewPackageLogger("github.com/coreos/etcd/pkg", "transport")
-
-type LimitedConnListener struct {
-	net.Listener
-	RuntimeFDLimit uint64
-}
-
-func (l *LimitedConnListener) Accept() (net.Conn, error) {
-	conn, err := l.Listener.Accept()
-	if err != nil {
-		return nil, err
-	}
-
-	n, err := runtime.FDUsage()
-	// Check whether fd number in use exceeds the set limit.
-	if err == nil && n >= l.RuntimeFDLimit {
-		conn.Close()
-		plog.Errorf("accept error: closing connection, exceed file descriptor usage limitation (fd limit=%d)", l.RuntimeFDLimit)
-		return nil, &acceptError{error: errors.New("exceed file descriptor usage limitation"), temporary: true}
-	}
-	return conn, nil
-}
-
-type acceptError struct {
-	error
-	temporary bool
-}
-
-func (e *acceptError) Timeout() bool { return false }
-
-func (e *acceptError) Temporary() bool { return e.temporary }
diff --git a/pkg/transport/limited_conn_listener_test.go b/pkg/transport/limited_conn_listener_test.go
deleted file mode 100644
index fd3fb05ef..000000000
--- a/pkg/transport/limited_conn_listener_test.go
+++ /dev/null
@@ -1,79 +0,0 @@
-// Copyright 2015 CoreOS, Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package transport
-
-import (
-	"net"
-	"net/http"
-	"net/http/httptest"
-	"testing"
-
-	"github.com/coreos/etcd/pkg/runtime"
-)
-
-func TestLimitedConnListenerAccept(t *testing.T) {
-	if _, err := runtime.FDUsage(); err != nil {
-		t.Skip("skip test due to unsupported runtime.FDUsage")
-	}
-
-	ln, err := net.Listen("tcp", ":0")
-	if err != nil {
-		t.Fatal(err)
-	}
-	fdNum, err := runtime.FDUsage()
-	if err != nil {
-		t.Fatal(err)
-	}
-	srv := &httptest.Server{
-		Listener: &LimitedConnListener{
-			Listener:       ln,
-			RuntimeFDLimit: fdNum + 100,
-		},
-		Config: &http.Server{},
-	}
-	srv.Start()
-	defer srv.Close()
-
-	resp, err := http.Get(srv.URL)
-	defer resp.Body.Close()
-	if err != nil {
-		t.Fatalf("Get error = %v, want nil", err)
-	}
-}
-
-func TestLimitedConnListenerLimit(t *testing.T) {
-	if _, err := runtime.FDUsage(); err != nil {
-		t.Skip("skip test due to unsupported runtime.FDUsage")
-	}
-
-	ln, err := net.Listen("tcp", ":0")
-	if err != nil {
-		t.Fatal(err)
-	}
-	srv := &httptest.Server{
-		Listener: &LimitedConnListener{
-			Listener:       ln,
-			RuntimeFDLimit: 0,
-		},
-		Config: &http.Server{},
-	}
-	srv.Start()
-	defer srv.Close()
-
-	_, err = http.Get(srv.URL)
-	if err == nil {
-		t.Fatalf("unexpected nil Get error")
-	}
-}