nopaque/app/daemon/job_utils.py

from datetime import datetime
from flask import current_app
from werkzeug.utils import secure_filename
from .. import db
from ..models import Job, JobResult
import docker
import json
import os
import shutil


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):
        ''' # Docker service settings # '''
        ''' ## Service specific settings ## '''
        if job.service == 'file-setup':
            mem_mb = 2048
            n_cores = 2
            executable = 'file-setup'
            image = (current_app.config['DOCKER_IMAGE_PREFIX']
                     + 'file-setup:' + job.service_version)
        elif job.service == 'ocr':
            mem_mb = 4096
            n_cores = 4
            executable = 'ocr'
            image = (current_app.config['DOCKER_IMAGE_PREFIX']
                     + 'ocr:' + job.service_version)
        elif job.service == 'nlp':
            mem_mb = 2048
            n_cores = 2
            executable = 'nlp'
            image = (current_app.config['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': current_app.config['SERVER_NAME'],
            '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'
        # Make sure that their is no data in the output directory
        shutil.rmtree(output_mount_source, ignore_errors=True)
        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:
            current_app.logger.error(
                'Create "{}" service raised '.format(name)
                + '"docker.errors.APIError" The server returned an error. '
                + 'Details: {}'.format(e)
            )
            return
        else:
            job.status = 'queued'

    def checkout_job_service(self, job):
        service_name = 'job_{}'.format(job.id)
        try:
            service = self.docker.services.get(service_name)
        except docker.errors.NotFound:
            current_app.logger.error(
                'Get "{}" service raised '.format(service_name)
                + '"docker.errors.NotFound" The service does not exist. '
                + '(job.status: {} -> failed)'.format(job.status)
            )
            job.status = 'failed'
        except docker.errors.APIError as e:
            current_app.logger.error(
                'Get "{}" service raised '.format(service_name)
                + '"docker.errors.APIError" The server returned an error. '
                + 'Details: {}'.format(e)
            )
            return
        except docker.errors.InvalidVersion:
            current_app.logger.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'
            elif job.status == 'running' and task_state in ['complete', 'failed']:  # noqa
                try:
                    service.remove()
                except docker.errors.APIError as e:
                    current_app.logger.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)
                    job.end_date = datetime.utcnow()
                    job.status = task_state

    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'
        except docker.errors.APIError as e:
            current_app.logger.error(
                'Get "{}" service raised '.format(service_name)
                + '"docker.errors.APIError" The server returned an error. '
                + 'Details: {}'.format(e)
            )
            return
        except docker.errors.InvalidVersion:
            current_app.logger.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:
                current_app.logger.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:
                current_app.logger.error(
                    'Remove "{}" service raised '.format(service_name)
                    + '"docker.errors.APIError" The server returned an error. '
                    + 'Details: {}'.format(e)
                )