data.py

# Copyright 2018 Markus Scheidgen
#
# 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.

"""
This module comprises a set of persistent document classes that hold all user related
data. These are information about users, their uploads and datasets, the associated
calculations, and files


.. autoclass:: Calc
    :members:
.. autoclass:: Upload
    :members:
"""

from typing import List, Any, ContextManager, Tuple, Generator, Dict
from mongoengine import StringField, DateTimeField, DictField
import logging
from structlog import wrap_logger
from contextlib import contextmanager
import os.path

from nomad import utils, coe_repo, config, infrastructure, search
from nomad.files import PathObject, UploadFiles, ExtractError, ArchiveBasedStagingUploadFiles
from nomad.processing.base import Proc, process, task, PENDING, SUCCESS, FAILURE
from nomad.parsing import parser_dict, match_parser
from nomad.normalizing import normalizers
from nomad.datamodel import UploadWithMetadata, CalcWithMetadata


class Calc(Proc):
    """
    Instances of this class represent calculations. This class manages the elastic
    search index entry, files, and archive for the respective calculation.

    It also contains the calculations processing and its state.

    The attribute list, does not include the various repository properties generated
    while parsing, including ``program_name``, ``program_version``, etc.

    Attributes:
        calc_id: the calc_id of this calc
        parser: the name of the parser used to process this calc
        upload_id: the id of the upload used to create this calculation
        mainfile: the mainfile (including path in upload) that was used to create this calc
    """
    calc_id = StringField(primary_key=True)
    upload_id = StringField()
    mainfile = StringField()
    parser = StringField()

    meta: Any = {
        'indices': [
            'upload_id', 'mainfile', 'code', 'parser', 'tasks_status'
        ]
    }

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._parser_backend = None
        self._upload: Upload = None
        self._upload_files: ArchiveBasedStagingUploadFiles = None
        self._calc_proc_logwriter = None
        self._calc_proc_logwriter_ctx: ContextManager = None

    @classmethod
    def get(cls, id):
        return cls.get_by_id(id, 'calc_id')

    @property
    def mainfile_file(self) -> PathObject:
        return self.upload_files.raw_file_object(self.mainfile)

    @property
    def upload(self) -> 'Upload':
        if not self._upload:
            self._upload = Upload.get(self.upload_id)
        return self._upload

    @property
    def upload_files(self) -> ArchiveBasedStagingUploadFiles:
        if not self._upload_files:
            self._upload_files = ArchiveBasedStagingUploadFiles(self.upload_id, is_authorized=lambda: True, local_path=self.upload.local_path)
        return self._upload_files

    def get_logger(self, **kwargs):
        """
        Returns a wrapped logger that additionally saves all entries to the calculation
        processing log in the archive.
        """
        logger = super().get_logger()
        logger = logger.bind(
            upload_id=self.upload_id, mainfile=self.mainfile, calc_id=self.calc_id, **kwargs)

        if self._calc_proc_logwriter_ctx is None:
            self._calc_proc_logwriter_ctx = self.upload_files.archive_log_file(self.calc_id, 'wt')
            self._calc_proc_logwriter = self._calc_proc_logwriter_ctx.__enter__()  # pylint: disable=E1101

        def save_to_calc_log(logger, method_name, event_dict):
            if self._calc_proc_logwriter is not None:
                program = event_dict.get('normalizer', 'parser')
                event = event_dict.get('event', '')
                entry = '[%s] %s: %s' % (method_name, program, event)
                if len(entry) > 120:
                    self._calc_proc_logwriter.write(entry[:120])
                    self._calc_proc_logwriter.write('...')
                else:
                    self._calc_proc_logwriter.write(entry)
                self._calc_proc_logwriter.write('\n')

            return event_dict

        return wrap_logger(logger, processors=[save_to_calc_log])

    @process
    def process_calc(self):
        logger = self.get_logger()
        if self.upload is None:
            logger.error('calculation upload does not exist')

        try:
            self.parsing()
            self.normalizing()
            self.archiving()
        finally:
            # close loghandler that was not closed due to failures
            try:
                if self._calc_proc_logwriter is not None:
                    self._calc_proc_logwriter.close()
                    self._calc_proc_logwriter = None
            except Exception as e:
                logger.error('could not close calculation proc log', exc_info=e)

    def on_process_complete(self, process_name):
        # the save might be necessary to correctly read the join condition from the db
        self.save()
        # in case of error, the process_name might be unknown
        if process_name == 'process_calc' or process_name is None:
            self.upload.reload()
            self.upload.check_join()

    @task
    def parsing(self):
        context = dict(parser=self.parser, step=self.parser)
        logger = self.get_logger(**context)
        parser = parser_dict[self.parser]

        with utils.timer(logger, 'parser executed', input_size=self.mainfile_file.size):
            try:
                self._parser_backend = parser.run(
                    self.upload_files.raw_file_object(self.mainfile).os_path, logger=logger)
            except Exception as e:
                self.fail(
                    'parser failed with exception', level=logging.ERROR,
                    exc_info=e, error=str(e), **context)
                return

        self._parser_backend.openNonOverlappingSection('section_calculation_info')
        self._parser_backend.addValue('upload_id', self.upload_id)
        self._parser_backend.addValue('calc_id', self.calc_id)
        self._parser_backend.addValue('calc_hash', self.upload_files.calc_hash(self.mainfile))
        self._parser_backend.addValue('main_file', self.mainfile)
        self._parser_backend.addValue('parser_name', self.parser)

        if self._parser_backend.status[0] != 'ParseSuccess':
            logger.error(self._parser_backend.status[1])
            error = self._parser_backend.status[1]
            self._parser_backend.addValue('parse_status', 'ParseFailure')
            self.fail(error, level=logging.INFO, **context)
        else:
            self._parser_backend.addValue('parse_status', 'ParseSuccess')

        self._parser_backend.closeNonOverlappingSection('section_calculation_info')

        self._parser_backend.openNonOverlappingSection('section_repository_info')
        self._parser_backend.addValue('repository_archive_gid', '%s/%s' % (self.upload_id, self.calc_id))
        self._parser_backend.addValue(
            'repository_filepaths', self.upload_files.calc_files(self.mainfile))
        self._parser_backend.closeNonOverlappingSection('section_repository_info')

        self.add_processor_info(self.parser)

    @contextmanager
    def use_parser_backend(self, processor_name):
        self._parser_backend.reset_status()
        yield self._parser_backend
        self.add_processor_info(processor_name)

    def add_processor_info(self, processor_name: str) -> None:
        self._parser_backend.openContext('/section_calculation_info/0')
        self._parser_backend.openNonOverlappingSection('section_archive_processing_info')
        self._parser_backend.addValue('archive_processor_name', processor_name)

        if self._parser_backend.status[0] == 'ParseSuccess':
            warnings = getattr(self._parser_backend, '_warnings', [])
            if len(warnings) > 0:
                self._parser_backend.addValue('archive_processor_status', 'WithWarnings')
                self._parser_backend.addValue('archive_processor_warning_number', len(warnings))
                self._parser_backend.addArrayValues('archive_processor_warnings', [str(warning) for warning in warnings])
            else:
                self._parser_backend.addValue('archive_processor_status', 'Success')
        else:
            errors = self._parser_backend.tasks_status[1]
            self._parser_backend.addValue('archive_processor_error', str(errors))

        self._parser_backend.closeNonOverlappingSection('section_archive_processing_info')
        self._parser_backend.closeContext('/section_calculation_info/0')

    @task
    def normalizing(self):
        for normalizer in normalizers:
            normalizer_name = normalizer.__name__
            context = dict(normalizer=normalizer_name, step=normalizer_name)
            logger = self.get_logger(**context)

            with utils.timer(
                    logger, 'normalizer executed', input_size=self.mainfile_file.size):
                with self.use_parser_backend(normalizer_name) as backend:
                    try:
                        normalizer(backend).normalize(logger=logger)
                    except Exception as e:
                        self.fail(
                            'normalizer failed with exception', level=logging.ERROR,
                            exc_info=e, error=str(e), **context)
                        self._parser_backend.status = ['ParseFailure', str(e)]

            failed = self._parser_backend.status[0] != 'ParseSuccess'
            if failed:
                logger.error(self._parser_backend.status[1])
                error = self._parser_backend.status[1]
                self.fail(error, level=logging.WARNING, error=error, **context)
                break
            else:
                logger.debug(
                    'completed normalizer successfully', normalizer=normalizer_name)

    @task
    def archiving(self):
        logger = self.get_logger()

        calc_with_metadata = self._parser_backend.to_calc_with_metadata()

        # persist the repository metadata
        with utils.timer(logger, 'saved repo metadata', step='persist'):
            self.upload_files.metadata.insert(calc_with_metadata.to_dict())

        # index in search
        with utils.timer(logger, 'indexed', step='persist'):
            calc_with_metadata.update(published=False, uploader=self.upload.uploader.to_popo())
            search.Entry.from_calc_with_metadata(calc_with_metadata).save()

        # persist the archive
        with utils.timer(
                logger, 'archived', step='persist',
                input_size=self.mainfile_file.size) as log_data:
            with self.upload_files.archive_file(self.calc_id, 'wt') as out:
                self._parser_backend.write_json(out, pretty=True)

            log_data.update(archive_size=self.upload_files.archive_file_object(self.calc_id).size)

        # close loghandler
        if self._calc_proc_logwriter is not None:
            with utils.timer(
                    logger, 'archived log', step='persist',
                    input_size=self.mainfile_file.size) as log_data:
                self._calc_proc_logwriter_ctx.__exit__(None, None, None)  # pylint: disable=E1101
                self._calc_proc_logwriter = None

                log_data.update(log_size=self.upload_files.archive_log_file_object(self.calc_id).size)

    def to_calc_with_metadata(self) -> CalcWithMetadata:
        upload_files = UploadFiles.get(self.upload_id, is_authorized=lambda: True)
        if self.upload_files is None:
            raise KeyError

        _data = upload_files.metadata.get(self.calc_id)
        return CalcWithMetadata(**_data)


class Upload(Proc):
    """
    Represents uploads in the databases. Provides persistence access to the files storage,
    and processing state.

    Attributes:
        name: optional user provided upload name
        local_path: optional local path, e.g. for files that are already somewhere on the server
        metadata: optional user provided additional meta data
        upload_id: the upload id generated by the database
        upload_time: the timestamp when the system realised the upload
        user_id: the id of the user that created this upload
    """
    id_field = 'upload_id'

    upload_id = StringField(primary_key=True)

    name = StringField(default=None)
    local_path = StringField(default=None)
    metadata = DictField(default=None)
    upload_time = DateTimeField()
    user_id = StringField(required=True)

    meta: Any = {
        'indexes': [
            'user_id', 'tasks_status'
        ]
    }

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self._upload_files: ArchiveBasedStagingUploadFiles = None

    @classmethod
    def get(cls, id):
        return cls.get_by_id(id, 'upload_id')

    @classmethod
    def user_uploads(cls, user: coe_repo.User) -> List['Upload']:
        """ Returns all uploads for the given user. Currently returns all uploads. """
        return cls.objects(user_id=str(user.user_id))

    @property
    def uploader(self):
        return coe_repo.User.from_user_id(self.user_id)

    def get_logger(self, **kwargs):
        logger = super().get_logger()
        logger = logger.bind(upload_id=self.upload_id, upload_name=self.name, **kwargs)
        return logger

    @classmethod
    def create(cls, **kwargs) -> 'Upload':
        """
        Creates a new upload for the given user, a user given name is optional.
        It will populate the record with a signed url and pending :class:`UploadProc`.
        The upload will be already saved to the database.

        Arguments:
            user (coe_repo.User): The user that created the upload.
        """
        user: coe_repo.User = kwargs['user']
        del(kwargs['user'])
        if 'upload_id' not in kwargs:
            kwargs.update(upload_id=utils.create_uuid())
        kwargs.update(user_id=str(user.user_id))
        self = super().create(**kwargs)

        self._continue_with('uploading')

        return self

    def delete(self):
        """ Deletes this upload process state entry and its calcs. """
        Calc.objects(upload_id=self.upload_id).delete()
        super().delete()

    @process
    def delete_upload(self):
        """
        Deletes of the upload, including its processing state and
        staging files.
        """
        logger = self.get_logger()

        with utils.lnr(logger, 'staged upload delete failed'):
            with utils.timer(
                    logger, 'upload deleted from index', step='delete',
                    upload_size=self.upload_files.size):
                search.delete_upload(self.upload_id)

            with utils.timer(
                    logger, 'staged upload deleted', step='delete',
                    upload_size=self.upload_files.size):
                self.upload_files.delete()
                self.delete()

        return True  # do not save the process status on the delete upload

    @process
    def publish_upload(self):
        """
        Moves the upload out of staging to add it to the coe repository. It will
        pack the staging upload files in to public upload files, add entries to the
        coe repository db and remove this instance and its calculation from the
        processing state db.
        """
        logger = self.get_logger()

        with utils.lnr(logger, 'publish failed'):
            upload_with_metadata = self.to_upload_with_metadata()

            with utils.timer(
                    logger, 'upload added to repository', step='publish',
                    upload_size=self.upload_files.size):
                coe_repo.Upload.add(upload_with_metadata)

            with utils.timer(
                    logger, 'staged upload files packed', step='publish',
                    upload_size=self.upload_files.size):
                for calc_metadata in upload_with_metadata.calcs:
                    calc_metadata.published = True
                    self.upload_files.metadata.update(
                        calc_id=calc_metadata.calc_id, updates=calc_metadata.to_dict())
                self.upload_files.pack()

            with utils.timer(
                    logger, 'index updated', step='publish',
                    upload_size=self.upload_files.size):
                coe_upload = coe_repo.Upload.from_upload_id(upload_with_metadata.upload_id)
                if coe_upload is not None:
                    search.publish(
                        [coe_calc.to_calc_with_metadata() for coe_calc in coe_upload.calcs])

            with utils.timer(
                    logger, 'staged upload deleted', step='publish',
                    upload_size=self.upload_files.size):
                self.upload_files.delete()
                self.delete()

        return True  # do not save the process status on the delete upload

    @process
    def process_upload(self):
        self.extracting()
        self.parse_all()

    @task
    def uploading(self):
        pass

    @property
    def upload_files(self) -> ArchiveBasedStagingUploadFiles:
        if not self._upload_files:
            self._upload_files = ArchiveBasedStagingUploadFiles(self.upload_id, is_authorized=lambda: True, local_path=self.local_path)
        return self._upload_files

    @task
    def extracting(self):
        """
        Task performed before the actual parsing/normalizing. Extracting and bagging
        the uploaded files, computing all keys, create an *upload* entry in the NOMAD-coe
        repository db, etc.
        """
        # extract the uploaded file, this will also create a bagit bag.
        logger = self.get_logger()
        try:
            with utils.timer(
                    logger, 'upload extracted', step='extracting',
                    upload_size=self.upload_files.size):
                self.upload_files.extract()
        except KeyError:
            self.fail('processing requested for non existing upload', log_level=logging.ERROR)
            return
        except ExtractError:
            self.fail('bad .zip/.tar file', log_level=logging.INFO)
            return

    def match_mainfiles(self) -> Generator[Tuple[str, object], None, None]:
        """
        Generator function that matches all files in the upload to all parsers to
        determine the upload's mainfiles.

        Returns:
            Tuples of mainfile, filename, and parsers
        """
        directories_with_match: Dict[str, str] = dict()
        for filename in self.upload_files.raw_file_manifest():
            try:
                parser = match_parser(filename, self.upload_files)
                if parser is not None:
                    directory = os.path.dirname(filename)
                    if directory in directories_with_match:
                        # TODO this might give us the chance to store directory based relationship
                        # between calcs for the future?
                        pass
                    else:
                        directories_with_match[directory] = filename

                    yield filename, parser
            except Exception as e:
                self.get_logger().error(
                    'exception while matching pot. mainfile',
                    mainfile=filename, exc_info=e)

    @task
    def parse_all(self):
        """
        Identified mainfile/parser combinations among the upload's files, creates
        respective :class:`Calc` instances, and triggers their processing.
        """
        logger = self.get_logger()

        with utils.timer(
                logger, 'upload extracted', step='matching',
                upload_size=self.upload_files.size):
            for filename, parser in self.match_mainfiles():
                calc = Calc.create(
                    calc_id=self.upload_files.calc_id(filename),
                    mainfile=filename, parser=parser.name,
                    upload_id=self.upload_id)

                calc.process_calc()

    def on_process_complete(self, process_name):
        if process_name == 'process_upload':
            self.check_join()

    def check_join(self):
        total_calcs = self.total_calcs
        processed_calcs = self.processed_calcs

        self.get_logger().debug('check join', processed_calcs=processed_calcs, total_calcs=total_calcs)
        if not self.process_running and processed_calcs >= total_calcs:
            self.get_logger().debug('join')
            self.join()

    def join(self):
        self.cleanup()

    @task
    def cleanup(self):
        # send email about process finish
        user = self.uploader
        name = '%s %s' % (user.first_name, user.last_name)
        message = '\n'.join([
            'Dear %s,' % name,
            '',
            'your data %suploaded %s has completed processing.' % (
                self.name if self.name else '', self.upload_time.isoformat()),
            'You can review your data on your upload page: %s' % config.services.upload_url
        ])
        try:
            infrastructure.send_mail(
                name=name, email=user.email, message=message, subject='Processing completed')
        except Exception as e:
            # probably due to email configuration problems
            # don't fail or present this error to clients
            self.logger.error('could not send after processing email', exc_info=e)

    @property
    def processed_calcs(self):
        return Calc.objects(upload_id=self.upload_id, tasks_status__in=[SUCCESS, FAILURE]).count()

    @property
    def total_calcs(self):
        return Calc.objects(upload_id=self.upload_id).count()

    @property
    def failed_calcs(self):
        return Calc.objects(upload_id=self.upload_id, tasks_status=FAILURE).count()

    @property
    def pending_calcs(self):
        return Calc.objects(upload_id=self.upload_id, tasks_status=PENDING).count()

    def all_calcs(self, start, end, order_by='mainfile'):
        return Calc.objects(upload_id=self.upload_id)[start:end].order_by(order_by)

    @property
    def calcs(self):
        return Calc.objects(upload_id=self.upload_id, tasks_status=SUCCESS)

    def to_upload_with_metadata(self) -> UploadWithMetadata:
        calc_metadata = dict()
        user_upload_time = None
        if self.metadata is not None:
            user_upload_time = self.metadata.get('_upload_time')
            for calc in self.metadata.get('calculations', []):
                calc_metadata[calc['mainfile']] = calc

        def apply_metadata(calc):
            metadata = calc_metadata.get(calc.mainfile, self.metadata)
            if metadata is not None:
                calc.apply_user_metadata(metadata)
            return calc

        result = UploadWithMetadata(
            upload_id=self.upload_id,
            uploader=utils.POPO(id=int(self.user_id)),
            upload_time=self.upload_time if user_upload_time is None else user_upload_time)

        result.calcs = [
            apply_metadata(calc.to_calc_with_metadata()) for calc in self.calcs]

        return result