nopaque/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


DOCKER_REGISTRY = 'gitlab.ub.uni-bielefeld.de:4567'
DOCKER_IMAGE_PREFIX = '{}/sfb1288inf/'.format(DOCKER_REGISTRY)


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):
        # Service specific settings
        if job.service == 'file-setup':
            mem_mb = 2048
            n_cores = 2
            executable = 'file-setup'
            image = DOCKER_IMAGE_PREFIX + 'file-setup:' + job.service_version
        elif job.service == 'ocr':
            mem_mb = 4096
            n_cores = 4
            executable = 'ocr'
            image = DOCKER_IMAGE_PREFIX + 'ocr:' + job.service_version
        elif job.service == 'nlp':
            mem_mb = 2048
            n_cores = 2
            executable = 'nlp'
            image = DOCKER_IMAGE_PREFIX + 'nlp:' + job.service_version
        # Command
        command = '{} -i /input -o /output'.format(executable)
        command += ' --log-dir /input'
        command += ' --mem-mb {}'.format(mem_mb)
        command += ' --n-cores {}'.format(n_cores)
        command += ' --zip [' + job.service + ']_' + secure_filename(job.title)
        command += ' ' + ' '.join(json.loads(job.service_args))
        # Constraints
        constraints = ['node.role==worker']
        # Labels
        labels = {'origin': 'nopaque', 'type': 'job', 'job_id': str(job.id)}
        # Mounts
        ## Input mount
        input_mount_source = job.path
        input_mount_target = '/input'
        if job.service == 'file-setup':
            input_mount_target += '/' + secure_filename(job.title)
        input_mount = input_mount_source + ':' + input_mount_target + ':rw'
        ## Output mount
        output_mount_source = os.path.join(job.path, 'output')
        output_mount_target = '/output'
        output_mount = output_mount_source + ':' + output_mount_target + ':rw'
        os.makedirs(output_mount_source)
        mounts = [input_mount, output_mount]
        # Name
        name = 'job_{}'.format(job.id)
        # Resources
        resources = docker.types.Resources(
            cpu_reservation=n_cores * (10 ** 9),
            mem_reservation=mem_mb * (10 ** 6)
        )
        # Restart policy
        restart_policy = docker.types.RestartPolicy()
        try:
            self.docker.services.create(
                image,
                command=command,
                constraints=constraints,
                labels=labels,
                mounts=mounts,
                name=name,
                resources=resources,
                restart_policy=restart_policy
            )
        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)