// +build !windows

package main

import (
	"bufio"
	"fmt"
	"io"
	"os/exec"
	"strings"
	"time"

	"github.com/docker/docker/integration-cli/checker"
	"github.com/docker/docker/integration-cli/daemon"
	"github.com/go-check/check"
)

type logMessage struct {
	err  error
	data []byte
}

func (s *DockerSwarmSuite) TestServiceLogs(c *check.C) {
	testRequires(c, ExperimentalDaemon)

	d := s.AddDaemon(c, true, true)

	// we have multiple services here for detecting the goroutine issue #28915
	services := map[string]string{
		"TestServiceLogs1": "hello1",
		"TestServiceLogs2": "hello2",
	}

	for name, message := range services {
		out, err := d.Cmd("service", "create", "--name", name, "busybox",
			"sh", "-c", fmt.Sprintf("echo %s; tail -f /dev/null", message))
		c.Assert(err, checker.IsNil)
		c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")
	}

	// make sure task has been deployed.
	waitAndAssert(c, defaultReconciliationTimeout,
		d.CheckRunningTaskImages, checker.DeepEquals,
		map[string]int{"busybox": len(services)})

	for name, message := range services {
		out, err := d.Cmd("service", "logs", name)
		c.Assert(err, checker.IsNil)
		c.Logf("log for %q: %q", name, out)
		c.Assert(out, checker.Contains, message)
	}
}

// countLogLines returns a closure that can be used with waitAndAssert to
// verify that a minimum number of expected container log messages have been
// output.
func countLogLines(d *daemon.Swarm, name string) func(*check.C) (interface{}, check.CommentInterface) {
	return func(c *check.C) (interface{}, check.CommentInterface) {
		out, err := d.Cmd("service", "logs", "-t", name)
		c.Assert(err, checker.IsNil)
		lines := strings.Split(strings.TrimSpace(out), "\n")
		return len(lines), check.Commentf("output, %q", string(out))
	}
}

func (s *DockerSwarmSuite) TestServiceLogsCompleteness(c *check.C) {
	testRequires(c, ExperimentalDaemon)
	d := s.AddDaemon(c, true, true)

	name := "TestServiceLogsCompleteness"

	// make a service that prints 6 lines
	out, err := d.Cmd("service", "create", "--name", name, "busybox", "sh", "-c", "for line in $(seq 1 6); do echo log test $line; done; sleep 100000")
	c.Assert(err, checker.IsNil)
	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")

	// make sure task has been deployed.
	waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, 1)
	// and make sure we have all the log lines
	waitAndAssert(c, defaultReconciliationTimeout, countLogLines(d, name), checker.Equals, 6)

	args := []string{"service", "logs", name}
	cmd := exec.Command(dockerBinary, d.PrependHostArg(args)...)
	r, w := io.Pipe()
	cmd.Stdout = w
	cmd.Stderr = w
	c.Assert(cmd.Start(), checker.IsNil)

	reader := bufio.NewReader(r)
	// i have heard anecdotal reports that logs may come back from the engine
	// mis-ordered. if this tests fails, consider the possibility that that
	// might be occurring
	for i := 1; i <= 6; i++ {
		msg := &logMessage{}
		msg.data, _, msg.err = reader.ReadLine()
		c.Assert(msg.err, checker.IsNil)
		c.Assert(string(msg.data), checker.Contains, fmt.Sprintf("log test %v", i))
	}
}

func (s *DockerSwarmSuite) TestServiceLogsTail(c *check.C) {
	testRequires(c, ExperimentalDaemon)
	d := s.AddDaemon(c, true, true)

	name := "TestServiceLogsTail"

	// make a service that prints 6 lines
	out, err := d.Cmd("service", "create", "--name", name, "busybox", "sh", "-c", "for line in $(seq 1 6); do echo log test $line; done; sleep 100000")
	c.Assert(err, checker.IsNil)
	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")

	// make sure task has been deployed.
	waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, 1)
	waitAndAssert(c, defaultReconciliationTimeout, countLogLines(d, name), checker.Equals, 6)

	args := []string{"service", "logs", "--tail=2", name}
	cmd := exec.Command(dockerBinary, d.PrependHostArg(args)...)
	r, w := io.Pipe()
	cmd.Stdout = w
	cmd.Stderr = w
	c.Assert(cmd.Start(), checker.IsNil)

	reader := bufio.NewReader(r)
	// see TestServiceLogsCompleteness for comments about logs being well-
	// ordered, if this flakes
	for i := 5; i <= 6; i++ {
		msg := &logMessage{}
		msg.data, _, msg.err = reader.ReadLine()
		c.Assert(msg.err, checker.IsNil)
		c.Assert(string(msg.data), checker.Contains, fmt.Sprintf("log test %v", i))
	}
}

func (s *DockerSwarmSuite) TestServiceLogsSince(c *check.C) {
	// See DockerSuite.TestLogsSince, which is where this comes from
	testRequires(c, ExperimentalDaemon)
	d := s.AddDaemon(c, true, true)

	name := "TestServiceLogsSince"

	out, err := d.Cmd("service", "create", "--name", name, "busybox", "sh", "-c", "for i in $(seq 1 3); do sleep .1; echo log$i; done; sleep 10000000")
	c.Assert(err, checker.IsNil)
	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")
	waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, 1)
	// wait a sec for the logs to come in
	waitAndAssert(c, defaultReconciliationTimeout, countLogLines(d, name), checker.Equals, 3)

	out, err = d.Cmd("service", "logs", "-t", name)
	c.Assert(err, checker.IsNil)

	log2Line := strings.Split(strings.Split(out, "\n")[1], " ")
	t, err := time.Parse(time.RFC3339Nano, log2Line[0]) // timestamp log2 is written
	c.Assert(err, checker.IsNil)
	u := t.Add(50 * time.Millisecond) // add .05s so log1 & log2 don't show up
	since := u.Format(time.RFC3339Nano)

	out, err = d.Cmd("service", "logs", "-t", fmt.Sprintf("--since=%v", since), name)
	c.Assert(err, checker.IsNil)

	unexpected := []string{"log1", "log2"}
	expected := []string{"log3"}
	for _, v := range unexpected {
		c.Assert(out, checker.Not(checker.Contains), v, check.Commentf("unexpected log message returned, since=%v", u))
	}
	for _, v := range expected {
		c.Assert(out, checker.Contains, v, check.Commentf("expected log message %v, was not present, since=%v", u))
	}
}

func (s *DockerSwarmSuite) TestServiceLogsFollow(c *check.C) {
	testRequires(c, ExperimentalDaemon)

	d := s.AddDaemon(c, true, true)

	name := "TestServiceLogsFollow"

	out, err := d.Cmd("service", "create", "--name", name, "busybox", "sh", "-c", "while true; do echo log test; sleep 0.1; done")
	c.Assert(err, checker.IsNil)
	c.Assert(strings.TrimSpace(out), checker.Not(checker.Equals), "")

	// make sure task has been deployed.
	waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, 1)

	args := []string{"service", "logs", "-f", name}
	cmd := exec.Command(dockerBinary, d.PrependHostArg(args)...)
	r, w := io.Pipe()
	cmd.Stdout = w
	cmd.Stderr = w
	c.Assert(cmd.Start(), checker.IsNil)

	// Make sure pipe is written to
	ch := make(chan *logMessage)
	done := make(chan struct{})
	go func() {
		reader := bufio.NewReader(r)
		for {
			msg := &logMessage{}
			msg.data, _, msg.err = reader.ReadLine()
			select {
			case ch <- msg:
			case <-done:
				return
			}
		}
	}()

	for i := 0; i < 3; i++ {
		msg := <-ch
		c.Assert(msg.err, checker.IsNil)
		c.Assert(string(msg.data), checker.Contains, "log test")
	}
	close(done)

	c.Assert(cmd.Process.Kill(), checker.IsNil)
}