From 64e5a3ba8223fd7802d8d142ba547af8906eab68 Mon Sep 17 00:00:00 2001
From: Armon Dadgar <armon.dadgar@gmail.com>
Date: Sat, 29 Aug 2015 20:07:24 -0700
Subject: [PATCH] client: testing task runner

---
 client/task_runner_test.go | 172 +++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 client/task_runner_test.go

diff --git a/client/task_runner_test.go b/client/task_runner_test.go
new file mode 100644
index 000000000..79810b331
--- /dev/null
+++ b/client/task_runner_test.go
@@ -0,0 +1,172 @@
+package client
+
+import (
+	"log"
+	"os"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/hashicorp/nomad/client/driver"
+	"github.com/hashicorp/nomad/nomad/mock"
+	"github.com/hashicorp/nomad/nomad/structs"
+	"github.com/hashicorp/nomad/testutil"
+)
+
+func testLogger() *log.Logger {
+	return log.New(os.Stderr, "", log.LstdFlags)
+}
+
+type MockTaskStateUpdater struct {
+	Count       int
+	Name        []string
+	Status      []string
+	Description []string
+}
+
+func (m *MockTaskStateUpdater) Update(name, status, desc string) {
+	m.Count += 1
+	m.Name = append(m.Name, name)
+	m.Status = append(m.Status, status)
+	m.Description = append(m.Description, desc)
+}
+
+func testTaskRunner() (*MockTaskStateUpdater, *TaskRunner) {
+	logger := testLogger()
+	conf := DefaultConfig()
+	conf.StateDir = "/tmp"
+	upd := &MockTaskStateUpdater{}
+	ctx := driver.NewExecContext()
+	alloc := mock.Alloc()
+	task := alloc.Job.TaskGroups[0].Tasks[0]
+	tr := NewTaskRunner(logger, conf, upd.Update, ctx, alloc.ID, task)
+	return upd, tr
+}
+
+func TestTaskRunner_SimpleRun(t *testing.T) {
+	upd, tr := testTaskRunner()
+	go tr.Run()
+	defer tr.Destroy()
+
+	select {
+	case <-tr.WaitCh():
+	case <-time.After(2 * time.Second):
+		t.Fatalf("timeout")
+	}
+
+	if upd.Count != 2 {
+		t.Fatalf("should have 2 updates: %#v", upd)
+	}
+	if upd.Name[0] != tr.task.Name {
+		t.Fatalf("bad: %#v", upd.Name)
+	}
+	if upd.Status[0] != structs.AllocClientStatusRunning {
+		t.Fatalf("bad: %#v", upd.Status)
+	}
+	if upd.Description[0] != "task started" {
+		t.Fatalf("bad: %#v", upd.Description)
+	}
+
+	if upd.Name[1] != tr.task.Name {
+		t.Fatalf("bad: %#v", upd.Name)
+	}
+	if upd.Status[1] != structs.AllocClientStatusDead {
+		t.Fatalf("bad: %#v", upd.Status)
+	}
+	if upd.Description[1] != "task completed" {
+		t.Fatalf("bad: %#v", upd.Description)
+	}
+}
+
+func TestTaskRunner_Destroy(t *testing.T) {
+	upd, tr := testTaskRunner()
+
+	// Change command to ensure we run for a bit
+	tr.task.Config["command"] = "/bin/sleep"
+	tr.task.Config["args"] = "10"
+	go tr.Run()
+
+	// Begin the tear down
+	go func() {
+		time.Sleep(100 * time.Millisecond)
+		tr.Destroy()
+	}()
+
+	select {
+	case <-tr.WaitCh():
+	case <-time.After(2 * time.Second):
+		t.Fatalf("timeout")
+	}
+
+	if upd.Count != 2 {
+		t.Fatalf("should have 2 updates: %#v", upd)
+	}
+	if upd.Status[0] != structs.AllocClientStatusRunning {
+		t.Fatalf("bad: %#v", upd.Status)
+	}
+	if upd.Status[1] != structs.AllocClientStatusDead {
+		t.Fatalf("bad: %#v", upd.Status)
+	}
+	if !strings.Contains(upd.Description[1], "task failed") {
+		t.Fatalf("bad: %#v", upd.Description)
+	}
+}
+
+func TestTaskRunner_Update(t *testing.T) {
+	_, tr := testTaskRunner()
+
+	// Change command to ensure we run for a bit
+	tr.task.Config["command"] = "/bin/sleep"
+	tr.task.Config["args"] = "10"
+	go tr.Run()
+	defer tr.Destroy()
+
+	// Update the task definition
+	newTask := new(structs.Task)
+	*newTask = *tr.task
+	newTask.Driver = "foobar"
+	tr.Update(newTask)
+
+	// Wait for update to take place
+	testutil.WaitForResult(func() (bool, error) {
+		return tr.task == newTask, nil
+	}, func(err error) {
+		t.Fatalf("err: %v", err)
+	})
+}
+
+func TestTaskRunner_SaveRestoreState(t *testing.T) {
+	upd, tr := testTaskRunner()
+
+	// Change command to ensure we run for a bit
+	tr.task.Config["command"] = "/bin/sleep"
+	tr.task.Config["args"] = "10"
+	go tr.Run()
+	defer tr.Destroy()
+
+	// Snapshot state
+	time.Sleep(200 * time.Millisecond)
+	err := tr.SaveState()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	// Create a new task runner
+	tr2 := NewTaskRunner(tr.logger, tr.config, upd.Update,
+		tr.ctx, tr.allocID, &structs.Task{Name: tr.task.Name})
+	err = tr2.RestoreState()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	go tr2.Run()
+	defer tr2.Destroy()
+
+	// Destroy and wait
+	tr2.Destroy()
+
+	select {
+	case <-tr.WaitCh():
+	case <-time.After(2 * time.Second):
+		t.Fatalf("timeout")
+	}
+}