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/*
* Copyright (c) 2017-2018 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
// File matcher/jobs.go contains implementation JobsManagerImpl of JobsManager
// interface. It creates new jobs, stores them, make their data available and
// allows to finish them.
package matcher
import (
"sync"
. "git.tizen.org/tools/boruta"
"git.tizen.org/tools/boruta/tunnels"
"git.tizen.org/tools/boruta/workers"
)
const defaultDryadUsername = "boruta-user"
// JobsManagerImpl manages jobs. It is an implementation of JobsManager interface.
// It provides methods for creation of new jobs, getting their data and finishing
// them.
type JobsManagerImpl struct {
JobsManager
// jobs stores all running jobs indexed by ID of the worker they are running on.
jobs map[WorkerUUID]*workers.Job
// workers provides access to workers.
workers WorkersManager
// mutex protects JobsManagerImpl from concurrent access.
mutex *sync.RWMutex
// hack for mocking purposes
newTunnel func() tunnels.Tunneler
}
// newTunnel provides default implementation of Tunneler interface.
// It uses tunnels package implementation of Tunnel.
// The function is set as JobsManagerImpl.newTunnel. Field can be replaced
// by another function providing Tunneler for tests purposes.
func newTunnel() tunnels.Tunneler {
return new(tunnels.Tunnel)
}
// NewJobsManager creates and returns new JobsManagerImpl structure.
func NewJobsManager(w WorkersManager) JobsManager {
return &JobsManagerImpl{
jobs: make(map[WorkerUUID]*workers.Job),
workers: w,
mutex: new(sync.RWMutex),
newTunnel: newTunnel,
}
}
// Create method creates a new job for the request and the worker. It also prepares
// communication to Dryad by creating a tunnel. It is a part of JobsManager
// interface implementation.
func (m *JobsManagerImpl) Create(req ReqID, worker WorkerUUID) error {
m.mutex.Lock()
defer m.mutex.Unlock()
_, present := m.jobs[worker]
if present {
return ErrJobAlreadyExists
}
addr, err := m.workers.GetWorkerSSHAddr(worker)
if err != nil {
return err
}
key, err := m.workers.GetWorkerKey(worker)
if err != nil {
return err
}
t := m.newTunnel()
err = t.Create(nil, addr)
if err != nil {
return err
}
job := &workers.Job{
Access: AccessInfo{
Addr: t.Addr(),
Key: key,
// TODO (m.wereski) Acquire username from config.
Username: defaultDryadUsername,
},
Tunnel: t,
Req: req,
}
m.jobs[worker] = job
return nil
}
// Get returns job information related to the worker ID or error if no job for
// that worker was found. It is a part of JobsManager interface implementation.
func (m *JobsManagerImpl) Get(worker WorkerUUID) (*workers.Job, error) {
m.mutex.RLock()
defer m.mutex.RUnlock()
job, present := m.jobs[worker]
if !present {
return nil, NotFoundError("Job")
}
return job, nil
}
// Finish closes the job execution, breaks the tunnel to Dryad and removes job
// from jobs collection.
// The Dryad should be notified and prepared for next job with key regeneration.
// It is a part of JobsManager interface implementation.
func (m *JobsManagerImpl) Finish(worker WorkerUUID) error {
defer m.workers.PrepareWorker(worker, true)
m.mutex.Lock()
defer m.mutex.Unlock()
job, present := m.jobs[worker]
if !present {
return NotFoundError("Job")
}
job.Tunnel.Close()
// TODO log an error in case of tunnel closing failure. Nothing more can be done.
delete(m.jobs, worker)
return nil
}
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