nopaque/web/app/tasks/job_utils.py

from datetime import datetime
from werkzeug.utils import secure_filename
from .. import db, mail
from ..email import create_message
from ..models import Job, JobResult
import docker
import logging
import json
import os


service_settings = {
    'file-setup': {
        'ressources': docker.types.Resources(mem_reservation=1024 * (10 ** 6),
                                             cpu_reservation=1 * (10 ** 9))
    },
    'nlp': {
        'default_args': ' --n-cores 2 --mem-mb 2048',
        'ressources': docker.types.Resources(mem_reservation=2048 * (10 ** 6),
                                             cpu_reservation=2 * (10 ** 9))
    },
    'ocr': {
        'default_args': ' --n-cores 4 --mem-mb 4096',
        'ressources': docker.types.Resources(mem_reservation=4096 * (10 ** 6),
                                             cpu_reservation=4 * (10 ** 9))
    }
}


class CheckJobsMixin:
    def check_jobs(self):
        jobs = Job.query.all()
        canceling_jobs = list(filter(lambda job: job.status == 'canceling', jobs))  # noqa
        queued_jobs = list(filter(lambda job: job.status == 'queued', jobs))
        running_jobs = list(filter(lambda job: job.status == 'running', jobs))
        submitted_jobs = list(filter(lambda job: job.status == 'submitted', jobs))  # noqa
        for job in submitted_jobs:
            self.create_job_service(job)
        for job in queued_jobs + running_jobs:
            self.checkout_job_service(job)
        for job in canceling_jobs:
            self.remove_job_service(job)

    def create_job_service(self, job):
        cmd = '{} -i /files -o /files/output'.format(job.service)
        if 'default_args' in service_settings[job.service]:
            cmd += service_settings[job.service]['default_args']
        if job.service == 'file-setup':
            cmd += ' -f {}'.format(secure_filename(job.title))
        cmd += ' --log-dir /files'
        cmd += ' --zip [{}]_{}'.format(job.service, secure_filename(job.title))
        cmd += ' ' + ' '.join(json.loads(job.service_args))
        ressources = service_settings[job.service]['ressources']
        service_kwargs = {'command': cmd,
                          'constraints': ['node.role==worker'],
                          'labels': {'origin': 'nopaque',
                                     'type': 'job',
                                     'job_id': str(job.id)},
                          'mounts': [job.path + ':/files:rw'],
                          'name': 'job_{}'.format(job.id),
                          'resources': ressources,
                          'restart_policy': docker.types.RestartPolicy()}
        service_image = 'gitlab.ub.uni-bielefeld.de:4567/sfb1288inf/{}:latest'.format(job.service)  # noqa
        try:
            self.docker.services.create(service_image, **service_kwargs)
        except docker.errors.APIError as e:
            logging.error(
                'Create "{}" service raised '.format(service_kwargs['name'])
                + '"docker.errors.APIError" The server returned an error. '
                + 'Details: {}'.format(e)
            )
            return
        else:
            job.status = 'queued'
            patch_operation = {'op': 'replace', 'path': '/jobs/{}/status'.format(job.id), 'value': job.status}  # noqa
            self.buffer_user_patch_operation(job, patch_operation)
        finally:
            self.send_job_notification(job)

    def checkout_job_service(self, job):
        service_name = 'job_{}'.format(job.id)
        try:
            service = self.docker.services.get(service_name)
        except docker.errors.NotFound:
            logging.error('Get "{}" service raised '.format(service_name)
                          + '"docker.errors.NotFound" The service does not exist. '
                          + '(job.status: {} -> failed)'.format(job.status))
            job.status = 'failed'
            patch_operation = {'op': 'replace', 'path': '/jobs/{}/status'.format(job.id), 'value': job.status}  # noqa
            self.buffer_user_patch_operation(job, patch_operation)
        except docker.errors.APIError as e:
            logging.error(
                'Get "{}" service raised '.format(service_name)
                + '"docker.errors.APIError" The server returned an error. '
                + 'Details: {}'.format(e)
            )
            return
        except docker.errors.InvalidVersion:
            logging.error(
                'Get "{}" service raised '.format(service_name)
                + '"docker.errors.InvalidVersion" One of the arguments is '
                + 'not supported with the current API version.'
            )
            return
        else:
            service_tasks = service.tasks()
            if not service_tasks:
                return
            task_state = service_tasks[0].get('Status').get('State')
            if job.status == 'queued' and task_state != 'pending':
                job.status = 'running'
                patch_operation = {'op': 'replace', 'path': '/jobs/{}/status'.format(job.id), 'value': job.status}  # noqa
                self.buffer_user_patch_operation(job, patch_operation)
            elif job.status == 'running' and task_state in ['complete', 'failed']:
                try:
                    service.remove()
                except docker.errors.APIError as e:
                    logging.error(
                        'Remove "{}" service raised '.format(service_name)
                        + '"docker.errors.APIError" The server returned an error. '  # noqa
                        + 'Details: {}'.format(e)
                    )
                    return
                else:
                    if task_state == 'complete':
                        results_dir = os.path.join(job.path, 'output')
                        result_files = filter(lambda x: x.endswith('.zip'),
                                              os.listdir(results_dir))
                        for result_file in result_files:
                            job_result = JobResult(filename=result_file, job=job)  # noqa
                            db.session.add(job_result)
                            db.session.flush()
                            db.session.refresh(job_result)
                            patch_operation = {'op': 'add', 'path': '/jobs/{}/results/{}'.format(job.id, job_result.id), 'value': job_result.to_dict()}  # noqa
                            self.buffer_user_patch_operation(job, patch_operation)  # noqa
                    job.end_date = datetime.utcnow()
                    patch_operation = {'op': 'replace', 'path': '/jobs/{}/end_date'.format(job.id), 'value': job.end_date.timestamp()}  # noqa
                    self.buffer_user_patch_operation(job, patch_operation)
                    job.status = task_state
                    patch_operation = {'op': 'replace', 'path': '/jobs/{}/status'.format(job.id), 'value': job.status}  # noqa
                    self.buffer_user_patch_operation(job, patch_operation)
        finally:
            self.send_job_notification(job)

    def remove_job_service(self, job):
        service_name = 'job_{}'.format(job.id)
        try:
            service = self.docker.services.get(service_name)
        except docker.errors.NotFound:
            job.status = 'canceled'
            patch_operation = {'op': 'replace', 'path': '/jobs/{}/status'.format(job.id), 'value': job.status}  # noqa
            self.buffer_user_patch_operation(job, patch_operation)
        except docker.errors.APIError as e:
            logging.error(
                'Get "{}" service raised '.format(service_name)
                + '"docker.errors.APIError" The server returned an error. '
                + 'Details: {}'.format(e)
            )
            return
        except docker.errors.InvalidVersion:
            logging.error(
                'Get "{}" service raised '.format(service_name)
                + '"docker.errors.InvalidVersion" One of the arguments is '
                + 'not supported with the current API version.'
            )
            return
        else:
            try:
                service.update(mounts=None)
            except docker.errors.APIError as e:
                logging.error(
                    'Update "{}" service raised '.format(service_name)
                    + '"docker.errors.APIError" The server returned an error. '
                    + 'Details: {}'.format(e)
                )
                return
            try:
                service.remove()
            except docker.errors.APIError as e:
                logging.error(
                    'Remove "{}" service raised '.format(service_name)
                    + '"docker.errors.APIError" The server returned an error. '
                    + 'Details: {}'.format(e)
                )

    def send_job_notification(self, job):
        if job.creator.setting_job_status_mail_notifications == 'none':
            return
        if (job.creator.setting_job_status_mail_notifications == 'end'
                and job.status not in ['complete', 'failed']):
            return
        msg = create_message(job.creator.email,
                             'Status update for your Job "{}"'.format(job.title),  # noqa
                             'tasks/email/notification', job=job)
        mail.send(msg)