PLT-6408 Framework for job server (#6404)

* Added initial job server

* Added job server to be ran as part of platform

* Added test job to the enterprise repo

* Fixed job server not loading license

* Renamed job package to jobs

* Fixed TE not being buildable

* Added JobStatus table to database

* Changed fields used by JobStatus

* Added APIs to query job status

* Added config change listener to server

* Added option to run job server from Makefile

* Added ability to enable/disable jobs from config

* Commented out placeholder for search indexing job

* Fixed govet

* Removed debug messages and fixed job api init message

model/scheduled_task_test.go

@@ -0,0 +1,188 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"testing"
+	"time"
+)
+
+func TestCreateTask(t *testing.T) {
+	TASK_NAME := "Test Task"
+	TASK_TIME := time.Second * 3
+
+	testValue := 0
+	testFunc := func() {
+		testValue = 1
+	}
+
+	task := CreateTask(TASK_NAME, testFunc, TASK_TIME)
+	if testValue != 0 {
+		t.Fatal("Unexpected execuition of task")
+	}
+
+	time.Sleep(TASK_TIME + time.Second)
+
+	if testValue != 1 {
+		t.Fatal("Task did not execute")
+	}
+
+	if task.Name != TASK_NAME {
+		t.Fatal("Bad name")
+	}
+
+	if task.Interval != TASK_TIME {
+		t.Fatal("Bad interval")
+	}
+
+	if task.Recurring != false {
+		t.Fatal("should not reccur")
+	}
+}
+
+func TestCreateRecurringTask(t *testing.T) {
+	TASK_NAME := "Test Recurring Task"
+	TASK_TIME := time.Second * 3
+
+	testValue := 0
+	testFunc := func() {
+		testValue += 1
+	}
+
+	task := CreateRecurringTask(TASK_NAME, testFunc, TASK_TIME)
+	if testValue != 0 {
+		t.Fatal("Unexpected execuition of task")
+	}
+
+	time.Sleep(TASK_TIME + time.Second)
+
+	if testValue != 1 {
+		t.Fatal("Task did not execute")
+	}
+
+	time.Sleep(TASK_TIME)
+
+	if testValue != 2 {
+		t.Fatal("Task did not re-execute")
+	}
+
+	if task.Name != TASK_NAME {
+		t.Fatal("Bad name")
+	}
+
+	if task.Interval != TASK_TIME {
+		t.Fatal("Bad interval")
+	}
+
+	if task.Recurring != true {
+		t.Fatal("should reccur")
+	}
+
+	task.Cancel()
+}
+
+func TestCancelTask(t *testing.T) {
+	TASK_NAME := "Test Task"
+	TASK_TIME := time.Second * 3
+
+	testValue := 0
+	testFunc := func() {
+		testValue = 1
+	}
+
+	task := CreateTask(TASK_NAME, testFunc, TASK_TIME)
+	if testValue != 0 {
+		t.Fatal("Unexpected execuition of task")
+	}
+	task.Cancel()
+
+	time.Sleep(TASK_TIME + time.Second)
+
+	if testValue != 0 {
+		t.Fatal("Unexpected execuition of task")
+	}
+}
+
+func TestGetAllTasks(t *testing.T) {
+	doNothing := func() {}
+
+	CreateTask("Task1", doNothing, time.Hour)
+	CreateTask("Task2", doNothing, time.Second)
+	CreateRecurringTask("Task3", doNothing, time.Second)
+	task4 := CreateRecurringTask("Task4", doNothing, time.Second)
+
+	task4.Cancel()
+
+	time.Sleep(time.Second * 3)
+
+	tasks := *GetAllTasks()
+	if len(tasks) != 2 {
+		t.Fatal("Wrong number of tasks got: ", len(tasks))
+	}
+	for _, task := range tasks {
+		if task.Name != "Task1" && task.Name != "Task3" {
+			t.Fatal("Wrong tasks")
+		}
+	}
+}
+
+func TestExecuteTask(t *testing.T) {
+	TASK_NAME := "Test Task"
+	TASK_TIME := time.Second * 5
+
+	testValue := 0
+	testFunc := func() {
+		testValue += 1
+	}
+
+	task := CreateTask(TASK_NAME, testFunc, TASK_TIME)
+	if testValue != 0 {
+		t.Fatal("Unexpected execuition of task")
+	}
+
+	task.Execute()
+
+	if testValue != 1 {
+		t.Fatal("Task did not execute")
+	}
+
+	time.Sleep(TASK_TIME + time.Second)
+
+	if testValue != 2 {
+		t.Fatal("Task re-executed")
+	}
+}
+
+func TestExecuteTaskRecurring(t *testing.T) {
+	TASK_NAME := "Test Recurring Task"
+	TASK_TIME := time.Second * 5
+
+	testValue := 0
+	testFunc := func() {
+		testValue += 1
+	}
+
+	task := CreateRecurringTask(TASK_NAME, testFunc, TASK_TIME)
+	if testValue != 0 {
+		t.Fatal("Unexpected execuition of task")
+	}
+
+	time.Sleep(time.Second * 3)
+
+	task.Execute()
+	if testValue != 1 {
+		t.Fatal("Task did not execute")
+	}
+
+	time.Sleep(time.Second * 3)
+	if testValue != 1 {
+		t.Fatal("Task should not have executed before 5 seconds")
+	}
+
+	time.Sleep(time.Second * 3)
+
+	if testValue != 2 {
+		t.Fatal("Task did not re-execute after forced execution")
+	}
+}