// Copyright 2018 Google 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 image provides end-to-end integration tests for runsc. These tests require
// docker and runsc to be installed on the machine. To set it up, run:
//
//     ./runsc/test/install.sh [--runtime <name>]
//
// The tests expect the runtime name to be provided in the RUNSC_RUNTIME
// environment variable (default: runsc-test).
//
// Each test calls docker commands to start up a container, and tests that it is
// behaving properly, with various runsc commands. The container is killed and deleted
// at the end.

package integration

import (
	"fmt"
	"net"
	"net/http"
	"os"
	"strings"
	"testing"
	"time"

	"gvisor.googlesource.com/gvisor/runsc/test/testutil"
)

// httpRequestSucceeds sends a request to a given url and checks that the status is OK.
func httpRequestSucceeds(client http.Client, server string, port int) error {
	url := fmt.Sprintf("http://%s:%d", server, port)
	// Ensure that content is being served.
	resp, err := client.Get(url)
	if err != nil {
		return fmt.Errorf("error reaching http server: %v", err)
	}
	if want := http.StatusOK; resp.StatusCode != want {
		return fmt.Errorf("wrong response code, got: %d, want: %d", resp.StatusCode, want)
	}
	return nil
}

// TestLifeCycle tests a basic Create/Start/Stop docker container life cycle.
func TestLifeCycle(t *testing.T) {
	if err := testutil.Pull("nginx"); err != nil {
		t.Fatal("docker pull failed:", err)
	}
	d := testutil.MakeDocker("lifecycle-test")
	if err := d.Create("-p", "80", "nginx"); err != nil {
		t.Fatal("docker create failed:", err)
	}
	if err := d.Start(); err != nil {
		d.CleanUp()
		t.Fatal("docker start failed:", err)
	}

	// Test that container is working
	port, err := d.FindPort(80)
	if err != nil {
		t.Fatal("docker.FindPort(80) failed: ", err)
	}
	if err := testutil.WaitForHTTP(port, 5*time.Second); err != nil {
		t.Fatal("WaitForHTTP() timeout:", err)
	}
	client := http.Client{Timeout: time.Duration(2 * time.Second)}
	if err := httpRequestSucceeds(client, "localhost", port); err != nil {
		t.Error("http request failed:", err)
	}

	if err := d.Stop(); err != nil {
		d.CleanUp()
		t.Fatal("docker stop failed:", err)
	}
	if err := d.Remove(); err != nil {
		t.Fatal("docker rm failed:", err)
	}
}

func TestPauseResume(t *testing.T) {
	if !testutil.IsPauseResumeSupported() {
		t.Log("Pause/resume is not supported, skipping test.")
		return
	}

	if err := testutil.Pull("google/python-hello"); err != nil {
		t.Fatal("docker pull failed:", err)
	}
	d := testutil.MakeDocker("pause-resume-test")
	if out, err := d.Run("-p", "8080", "google/python-hello"); err != nil {
		t.Fatalf("docker run failed: %v\nout: %s", err, out)
	}
	defer d.CleanUp()

	// Find where port 8080 is mapped to.
	port, err := d.FindPort(8080)
	if err != nil {
		t.Fatal("docker.FindPort(8080) failed:", err)
	}

	// Wait until it's up and running.
	if err := testutil.WaitForHTTP(port, 20*time.Second); err != nil {
		t.Fatal("WaitForHTTP() timeout:", err)
	}

	// Check that container is working.
	client := http.Client{Timeout: time.Duration(2 * time.Second)}
	if err := httpRequestSucceeds(client, "localhost", port); err != nil {
		t.Error("http request failed:", err)
	}

	if err := d.Pause(); err != nil {
		t.Fatal("docker pause failed:", err)
	}

	// Check if container is paused.
	switch _, err := client.Get(fmt.Sprintf("http://localhost:%d", port)); v := err.(type) {
	case nil:
		t.Errorf("http req expected to fail but it succeeded")
	case net.Error:
		if !v.Timeout() {
			t.Errorf("http req got error %v, wanted timeout", v)
		}
	default:
		t.Errorf("http req got unexpected error %v", v)
	}

	if err := d.Unpause(); err != nil {
		t.Fatal("docker unpause failed:", err)
	}

	// Wait until it's up and running.
	if err := testutil.WaitForHTTP(port, 20*time.Second); err != nil {
		t.Fatal("WaitForHTTP() timeout:", err)
	}

	// Check if container is working again.
	if err := httpRequestSucceeds(client, "localhost", port); err != nil {
		t.Error("http request failed:", err)
	}
}

// Create client and server that talk to each other using the local IP.
func TestConnectToSelf(t *testing.T) {
	d := testutil.MakeDocker("connect-to-self-test")

	// Creates server that replies "server" and exists. Sleeps at the end because
	// 'docker exec' gets killed if the init process exists before it can finish.
	if _, err := d.Run("ubuntu:trusty", "/bin/sh", "-c", "echo server | nc -l -p 8080 && sleep 1"); err != nil {
		t.Fatal("docker run failed:", err)
	}
	defer d.CleanUp()

	// Finds IP address for host.
	ip, err := d.Exec("/bin/sh", "-c", "cat /etc/hosts | grep ${HOSTNAME} | awk '{print $1}'")
	if err != nil {
		t.Fatal("docker exec failed:", err)
	}
	ip = strings.TrimRight(ip, "\n")

	// Runs client that sends "client" to the server and exits.
	reply, err := d.Exec("/bin/sh", "-c", fmt.Sprintf("echo client | nc %s 8080", ip))
	if err != nil {
		t.Fatal("docker exec failed:", err)
	}

	// Ensure both client and server got the message from each other.
	if want := "server\n"; reply != want {
		t.Errorf("Error on server, want: %q, got: %q", want, reply)
	}
	if _, err := d.WaitForOutput("^client\n$", 1*time.Second); err != nil {
		t.Fatal("docker.WaitForOutput(client) timeout:", err)
	}
}

func MainTest(m *testing.M) {
	testutil.EnsureSupportedDockerVersion()
	os.Exit(m.Run())
}