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

3 files changed, 112 insertions, 21 deletions

diff --git a/app/job.go b/app/job.go
new file mode 100644
index 000000000..00439e4d2
--- /dev/null
+++ b/app/job.go
@@ -0,0 +1,28 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"github.com/mattermost/platform/model"
+)
+
+func GetJobStatus(id string) (*model.JobStatus, *model.AppError) {
+	if result := <-Srv.Store.JobStatus().Get(id); result.Err != nil {
+		return nil, result.Err
+	} else {
+		return result.Data.(*model.JobStatus), nil
+	}
+}
+
+func GetJobStatusesByTypePage(jobType string, page int, perPage int) ([]*model.JobStatus, *model.AppError) {
+	return GetJobStatusesByType(jobType, page*perPage, perPage)
+}
+
+func GetJobStatusesByType(jobType string, offset int, limit int) ([]*model.JobStatus, *model.AppError) {
+	if result := <-Srv.Store.JobStatus().GetAllByTypePage(jobType, offset, limit); result.Err != nil {
+		return nil, result.Err
+	} else {
+		return result.Data.([]*model.JobStatus), nil
+	}
+}
diff --git a/app/job_test.go b/app/job_test.go
new file mode 100644
index 000000000..20e9dee8a
--- /dev/null
+++ b/app/job_test.go
@@ -0,0 +1,78 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"testing"
+
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/store"
+)
+
+func TestGetJobStatus(t *testing.T) {
+	Setup()
+
+	status := &model.JobStatus{
+		Id:     model.NewId(),
+		Status: model.NewId(),
+	}
+	if result := <-Srv.Store.JobStatus().SaveOrUpdate(status); result.Err != nil {
+		t.Fatal(result.Err)
+	}
+
+	defer Srv.Store.JobStatus().Delete(status.Id)
+
+	if received, err := GetJobStatus(status.Id); err != nil {
+		t.Fatal(err)
+	} else if received.Id != status.Id || received.Status != status.Status {
+		t.Fatal("inccorrect job status received")
+	}
+}
+
+func TestGetJobStatusesByType(t *testing.T) {
+	Setup()
+
+	jobType := model.NewId()
+
+	statuses := []*model.JobStatus{
+		{
+			Id:      model.NewId(),
+			Type:    jobType,
+			StartAt: 1000,
+		},
+		{
+			Id:      model.NewId(),
+			Type:    jobType,
+			StartAt: 999,
+		},
+		{
+			Id:      model.NewId(),
+			Type:    jobType,
+			StartAt: 1001,
+		},
+	}
+
+	for _, status := range statuses {
+		store.Must(Srv.Store.JobStatus().SaveOrUpdate(status))
+		defer Srv.Store.JobStatus().Delete(status.Id)
+	}
+
+	if received, err := GetJobStatusesByType(jobType, 0, 2); err != nil {
+		t.Fatal(err)
+	} else if len(received) != 2 {
+		t.Fatal("received wrong number of statuses")
+	} else if received[0].Id != statuses[1].Id {
+		t.Fatal("should've received newest job first")
+	} else if received[1].Id != statuses[0].Id {
+		t.Fatal("should've received second newest job second")
+	}
+
+	if received, err := GetJobStatusesByType(jobType, 2, 2); err != nil {
+		t.Fatal(err)
+	} else if len(received) != 1 {
+		t.Fatal("received wrong number of statuses")
+	} else if received[0].Id != statuses[2].Id {
+		t.Fatal("should've received oldest job last")
+	}
+}
diff --git a/app/license.go b/app/license.go
index 7a00d7fb4..44b700d5b 100644
--- a/app/license.go
+++ b/app/license.go
@@ -4,7 +4,6 @@
 package app
 
 import (
-	"os"
 	"strings"
 
 	l4g "github.com/alecthomas/log4go"
@@ -23,28 +22,14 @@ func LoadLicense() {
 
 	if len(licenseId) != 26 {
 		// Lets attempt to load the file from disk since it was missing from the DB
-		fileName := utils.GetLicenseFileLocation(*utils.Cfg.ServiceSettings.LicenseFileLocation)
-
-		if _, err := os.Stat(fileName); err == nil {
-			l4g.Info("License key has not been uploaded.  Loading license key from disk at %v", fileName)
-			licenseBytes := utils.GetLicenseFileFromDisk(fileName)
-
-			if success, licenseStr := utils.ValidateLicense(licenseBytes); success {
-				licenseFileFromDisk := model.LicenseFromJson(strings.NewReader(licenseStr))
-				licenseId = licenseFileFromDisk.Id
-				if _, err := SaveLicense(licenseBytes); err != nil {
-					l4g.Info("Failed to save license key loaded from disk err=%v", err.Error())
-					return
-				}
+		license, licenseBytes := utils.GetAndValidateLicenseFileFromDisk()
+
+		if license != nil {
+			if _, err := SaveLicense(licenseBytes); err != nil {
+				l4g.Info("Failed to save license key loaded from disk err=%v", err.Error())
 			} else {
-				l4g.Error("Found license key at %v but it appears to be invalid.", fileName)
-				return
+				licenseId = license.Id
 			}
-
-		} else {
-			l4g.Info(utils.T("mattermost.load_license.find.warn"))
-			l4g.Debug("We could not find the license key in the database or on disk at %v", fileName)
-			return
 		}
 	}