Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/jobs/migrations/scheduler.go

@@ -0,0 +1,105 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package migrations
+
+import (
+	"time"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/jobs"
+	"github.com/mattermost/mattermost-server/v6/server/channels/store"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+)
+
+const (
+	MigrationJobWedgedTimeoutMilliseconds = 3600000 // 1 hour
+)
+
+type Scheduler struct {
+	jobServer              *jobs.JobServer
+	store                  store.Store
+	allMigrationsCompleted bool
+}
+
+func MakeScheduler(jobServer *jobs.JobServer, store store.Store) model.Scheduler {
+	return &Scheduler{jobServer, store, false}
+}
+
+func (scheduler *Scheduler) Enabled(_ *model.Config) bool {
+	return true
+}
+
+//nolint:unparam
+func (scheduler *Scheduler) NextScheduleTime(cfg *model.Config, now time.Time, pendingJobs bool, lastSuccessfulJob *model.Job) *time.Time {
+	if scheduler.allMigrationsCompleted {
+		return nil
+	}
+
+	nextTime := time.Now().Add(60 * time.Second)
+	return &nextTime
+}
+
+//nolint:unparam
+func (scheduler *Scheduler) ScheduleJob(cfg *model.Config, pendingJobs bool, lastSuccessfulJob *model.Job) (*model.Job, *model.AppError) {
+	mlog.Debug("Scheduling Job", mlog.String("scheduler", model.JobTypeMigrations))
+
+	// Work through the list of migrations in order. Schedule the first one that isn't done (assuming it isn't in progress already).
+	for _, key := range MakeMigrationsList() {
+		state, job, err := GetMigrationState(key, scheduler.store)
+		if err != nil {
+			mlog.Error("Failed to determine status of migration: ", mlog.String("scheduler", model.JobTypeMigrations), mlog.String("migration_key", key), mlog.Err(err))
+			return nil, nil
+		}
+
+		if state == MigrationStateInProgress {
+			// Check the migration job isn't wedged.
+			if job != nil && job.LastActivityAt < model.GetMillis()-MigrationJobWedgedTimeoutMilliseconds && job.CreateAt < model.GetMillis()-MigrationJobWedgedTimeoutMilliseconds {
+				mlog.Warn("Job appears to be wedged. Rescheduling another instance.", mlog.String("scheduler", model.JobTypeMigrations), mlog.String("wedged_job_id", job.Id), mlog.String("migration_key", key))
+				if err := scheduler.jobServer.SetJobError(job, nil); err != nil {
+					mlog.Error("Worker: Failed to set job error", mlog.String("scheduler", model.JobTypeMigrations), mlog.String("job_id", job.Id), mlog.Err(err))
+				}
+				return scheduler.createJob(key, job)
+			}
+
+			return nil, nil
+		}
+
+		if state == MigrationStateCompleted {
+			// This migration is done. Continue to check the next.
+			continue
+		}
+
+		if state == MigrationStateUnscheduled {
+			mlog.Debug("Scheduling a new job for migration.", mlog.String("scheduler", model.JobTypeMigrations), mlog.String("migration_key", key))
+			return scheduler.createJob(key, job)
+		}
+
+		mlog.Error("Unknown migration state. Not doing anything.", mlog.String("migration_state", state))
+		return nil, nil
+	}
+
+	// If we reached here, then there aren't any migrations left to run.
+	scheduler.allMigrationsCompleted = true
+	mlog.Debug("All migrations are complete.", mlog.String("scheduler", model.JobTypeMigrations))
+
+	return nil, nil
+}
+
+func (scheduler *Scheduler) createJob(migrationKey string, lastJob *model.Job) (*model.Job, *model.AppError) {
+	var lastDone string
+	if lastJob != nil {
+		lastDone = lastJob.Data[JobDataKeyMigrationLastDone]
+	}
+
+	data := map[string]string{
+		JobDataKeyMigration:         migrationKey,
+		JobDataKeyMigrationLastDone: lastDone,
+	}
+
+	job, err := scheduler.jobServer.CreateJob(model.JobTypeMigrations, data)
+	if err != nil {
+		return nil, err
+	}
+	return job, nil
+}