Add port-forward-tester image

test/images/port-forward-tester/.gitignore

+portforwardtester

test/images/port-forward-tester/Dockerfile

+# Copyright 2015 The Kubernetes Authors All rights reserved.
+#
+# 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.
+
+FROM scratch
+ADD portforwardtester portforwardtester
+ADD portforwardtester.go portforwardtester.go
+ENTRYPOINT ["/portforwardtester"]

test/images/port-forward-tester/Makefile

+all: push
+
+TAG = 1.0
+
+portforwardtester: portforwardtester.go
+	CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-w' ./portforwardtester.go
+
+image: portforwardtester
+	docker build -t gcr.io/google_containers/portforwardtester:$(TAG) .
+
+push: image
+	gcloud docker push gcr.io/google_containers/portforwardtester:$(TAG)
+
+clean:
+	rm -f portforwardtester

test/images/port-forward-tester/portforwardtester.go

+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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.
+*/
+
+// A tiny binary for testing port forwarding. The following environment variables
+// control the binary's logic:
+//
+// BIND_PORT - the TCP port to use for the listener
+// EXPECTED_CLIENT_DATA - data that we expect to receive from the client; may be "".
+// CHUNKS - how many chunks of data we should send to the client
+// CHUNK_SIZE - how large each chunk should be
+// CHUNK_INTERVAL - the delay in between sending each chunk
+//
+// Log messages are written to stdout at various stages of the binary's execution.
+// Test code can retrieve this container's log and validate that the expected
+// behavior is taking place.
+package main
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func getEnvInt(name string) int {
+	s := os.Getenv(name)
+	value, err := strconv.Atoi(s)
+	if err != nil {
+		fmt.Printf("Error parsing %s %q: %v\n", name, s, err)
+		os.Exit(1)
+	}
+	return value
+}
+
+func main() {
+	bindPort := os.Getenv("BIND_PORT")
+	listener, err := net.Listen("tcp", fmt.Sprintf("localhost:%s", bindPort))
+	if err != nil {
+		fmt.Printf("Error listening: %v\n", err)
+		os.Exit(1)
+	}
+
+	conn, err := listener.Accept()
+	if err != nil {
+		fmt.Printf("Error accepting connection: %v\n", err)
+		os.Exit(1)
+	}
+	defer conn.Close()
+	fmt.Println("Accepted client connection")
+
+	expectedClientData := os.Getenv("EXPECTED_CLIENT_DATA")
+	if len(expectedClientData) > 0 {
+		buf := make([]byte, len(expectedClientData))
+		read, err := conn.Read(buf)
+		if read != len(expectedClientData) {
+			fmt.Printf("Expected to read %d bytes from client, but got %d instead. err=%v\n", len(expectedClientData), read, err)
+			os.Exit(2)
+		}
+		if expectedClientData != string(buf) {
+			fmt.Printf("Expect to read %q, but got %q. err=%v\n", expectedClientData, string(buf), err)
+			os.Exit(3)
+		}
+		if err != nil {
+			fmt.Printf("Read err: %v\n", err)
+		}
+		fmt.Println("Received expected client data")
+	}
+
+	chunks := getEnvInt("CHUNKS")
+	chunkSize := getEnvInt("CHUNK_SIZE")
+	chunkInterval := getEnvInt("CHUNK_INTERVAL")
+
+	stringData := strings.Repeat("x", chunkSize)
+	data := []byte(stringData)
+
+	for i := 0; i < chunks; i++ {
+		written, err := conn.Write(data)
+		if written != chunkSize {
+			fmt.Printf("Expected to write %d bytes from client, but wrote %d instead. err=%v\n", chunkSize, written, err)
+			os.Exit(4)
+		}
+		if err != nil {
+			fmt.Printf("Write err: %v\n", err)
+		}
+		if i+1 < chunks {
+			time.Sleep(time.Duration(chunkInterval) * time.Millisecond)
+		}
+	}
+
+	fmt.Println("Done")
+}