helpers.py

#!/usr/bin/env python
# vim: set fileencoding=utf-8 :

###############################################################################
#                                                                             #
# Copyright (c) 2017 Idiap Research Institute, http://www.idiap.ch/           #
# Contact: beat.support@idiap.ch                                              #
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# This file is part of the beat.backend.python module of the BEAT platform.   #
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import os
import errno

import logging
logger = logging.getLogger(__name__)

from .data import CachedDataSource
from .data import CachedDataSink
from .data import getAllFilenames
from .data_loaders import DataLoaderList
from .data_loaders import DataLoader
from .inputs import InputList
from .inputs import Input
from .inputs import InputGroup
from .outputs import SynchronizationListener
from .outputs import OutputList
from .outputs import Output
from .algorithm import Algorithm


#----------------------------------------------------------


def convert_experiment_configuration_to_container(config):
    data = {
        'algorithm': config['algorithm'],
        'parameters': config['parameters'],
        'channel': config['channel'],
        'uid': os.getuid(),
    }

    if 'range' in config:
        data['range'] = config['range']

    data['inputs'] = \
          dict([(k, { 'channel': v['channel'], 'path': v['path'], 'database': v.has_key('database') }) for k,v in config['inputs'].items()])

    if 'outputs' in config:
        data['outputs'] = \
              dict([(k, { 'channel': v['channel'], 'path': v['path'] }) for k,v in config['outputs'].items()])
    else:
        data['result'] = { 'channel': config['channel'], 'path': config['result']['path'] }

    return data


#----------------------------------------------------------


class AccessMode:
    NONE   = 0
    LOCAL  = 1
    REMOTE = 2


def create_inputs_from_configuration(config, algorithm, prefix, cache_root,
                                     cache_access=AccessMode.NONE,
                                     db_access=AccessMode.NONE,
                                     unpack=True, socket=None,
                                     databases=None,
                                     no_synchronisation_listeners=False):

    data_sources = []
    views = {}
    input_list = InputList()
    data_loader_list = DataLoaderList()

    # This is used for parallelization purposes
    start_index, end_index = config.get('range', (None, None))


    def _create_local_input(details):
        data_source = CachedDataSource()
        data_sources.append(data_source)

        filename = os.path.join(cache_root, details['path'] + '.data')

        if details['channel'] == config['channel']: # synchronized
            status = data_source.setup(
                      filename=filename,
                      prefix=prefix,
                      start_index=start_index,
                      end_index=end_index,
                      unpack=True,
                     )
        else:
            status = data_source.setup(
                      filename=filename,
                      prefix=prefix,
                      unpack=True,
                     )

        if not status:
            raise IOError("cannot load cache file `%s'" % details['path'])

        input = Input(name, algorithm.input_map[name], data_source)

        logger.debug("Input '%s' created: group='%s', dataformat='%s', filename='%s'" % \
                        (name, details['channel'], algorithm.input_map[name], filename))

        return input


    def _get_data_loader_for(details):
        data_loader = data_loader_list[details['channel']]
        if data_loader is None:
            data_loader = DataLoader(details['channel'])
            data_loader_list.add(data_loader)

            logger.debug("Data loader created: group='%s'" % details['channel'])

        return data_loader


    def _create_data_source(details):
        data_loader = _get_data_loader_for(details)

        filename = os.path.join(cache_root, details['path'] + '.data')

        data_source = CachedDataSource()
        result = data_source.setup(
            filename=filename,
            prefix=prefix,
            start_index=start_index,
            end_index=end_index,
            unpack=True,
        )

        if not result:
            raise IOError("cannot load cache file `%s'" % details['path'])

        data_loader.add(name, data_source)

        logger.debug("Input '%s' added to data loader: group='%s', dataformat='%s', filename='%s'" % \
                        (name, details['channel'], algorithm.input_map[name], filename))


    for name, details in config['inputs'].items():

        input = None

        if details.get('database', False):
            if db_access == AccessMode.LOCAL:
                if databases is None:
                    raise IOError("No databases provided")

                # Retrieve the database
                try:
                    db = databases[details['database']]
                except:
                    raise IOError("Database '%s' not found" % details['database'])

                # Create of retrieve the database view
                channel = details['channel']

                if not views.has_key(channel):
                    view = db.view(details['protocol'], details['set'])
                    print details
                    view.setup()
                    views[channel] = view

                    logger.debug("Database view '%s/%s/%s' created: group='%s'" % \
                                    (details['database'], details['protocol'], details['set'],
                                     channel))
                else:
                    view = views[channel]

                data_loader = _get_data_loader_for(details)
                data_loader.add(name, view.data_sources[details['output']])

                logger.debug("DatabaseOutputDataSource '%s' created: group='%s', dataformat='%s', database-output='%s/%s/%s:%s'" % \
                                (name, channel, algorithm.input_map[name], details['database'],
                                 details['protocol'], details['set'], details['output']))

            elif db_access == AccessMode.REMOTE:
                if socket is None:
                    raise IOError("No socket provided for remote data sources")

                data_loader = _get_data_loader_for(details)

                data_source = RemoteDataSource()
                result = data_source.setup(
                    socket=socket,
                    input_name=name,
                    dataformat_name=algorithm.input_map[name],
                    prefix=prefix,
                    unpack=True
                )

                if not result:
                    raise IOError("cannot setup remote data source '%s'" % name)

                data_loader.add(name, data_source)

                logger.debug("RemoteDataSource '%s' created: group='%s', dataformat='%s', connected to a database" % \
                                (name, details['channel'], algorithm.input_map[name]))


        elif cache_access == AccessMode.LOCAL:

            if algorithm.type == Algorithm.LEGACY:
                input = _create_local_input(details)

            elif algorithm.type == Algorithm.SEQUENTIAL:
                if details['channel'] == config['channel']: # synchronized
                    input = _create_local_input(details)
                else:
                    _create_data_source(details)

            elif algorithm.type == Algorithm.AUTONOMOUS:
                _create_data_source(details)

        else:
            continue

        # Synchronization bits
        if input is not None:
            group = input_list.group(details['channel'])
            if group is None:
                synchronization_listener = None
                if not no_synchronisation_listeners:
                    synchronization_listener = SynchronizationListener()

                group = InputGroup(
                          details['channel'],
                          synchronization_listener=synchronization_listener,
                          restricted_access=(details['channel'] == config['channel'])
                        )
                input_list.add(group)
                logger.debug("Group '%s' created" % details['channel'])

            group.add(input)

    return (input_list, data_loader_list, data_sources)


#----------------------------------------------------------


def create_outputs_from_configuration(config, algorithm, prefix, cache_root, input_list):

    data_sinks = []
    output_list = OutputList()

    # This is used for parallelization purposes
    start_index, end_index = config.get('range', (None, None))

    # If the algorithm is an analyser
    if 'result' in config:
        output_config = {
            'result': config['result']
        }
    else:
        output_config = config['outputs']


    for name, details in output_config.items():

        synchronization_listener = None

        if 'result' in config:
            dataformat_name = 'analysis:' + algorithm.name
            dataformat = algorithm.result_dataformat()
        else:
            dataformat_name = algorithm.output_map[name]
            dataformat =  algorithm.dataformats[dataformat_name]

            input_group = input_list.group(details['channel'])
            if input_group is not None:
                synchronization_listener = input_group.synchronization_listener

        path = os.path.join(cache_root, details['path'] + '.data')
        dirname = os.path.dirname(path)
        # Make sure that the directory exists while taking care of race
        # conditions. see: http://stackoverflow.com/questions/273192/check-if-a-directory-exists-and-create-it-if-necessary
        try:
            if (len(dirname) > 0):
                os.makedirs(dirname)
        except OSError as exception:
            if exception.errno != errno.EEXIST:
                raise

        if start_index is None:
            for k, v in config['inputs'].items():
                if v['channel'] == config['channel']:
                    input_path = os.path.join(cache_root, v['path'] + '.data')
                    break

            (data_filenames, indices_filenames, data_checksum_filenames, indices_checksum_filenames) = \
                    getAllFilenames(input_path)

            end_indices = [ int(x.split('.')[-2]) for x in indices_filenames ]
            end_indices.sort()

            start_index = 0
            end_index = end_indices[-1]

        data_sink = CachedDataSink()
        data_sinks.append(data_sink)

        status = data_sink.setup(
            filename=path,
            dataformat=dataformat,
            start_index=start_index,
            end_index=end_index,
            encoding='binary'
        )

        if not status:
            raise IOError("Cannot create cache sink '%s'" % details['path'])

        output_list.add(Output(name, data_sink,
                               synchronization_listener=synchronization_listener,
                               force_start_index=start_index)
        )

        if 'result' not in config:
            logger.debug("Output '%s' created: group='%s', dataformat='%s', filename='%s'" % \
                            (name, details['channel'], dataformat_name, path))
        else:
            logger.debug("Output '%s' created: dataformat='%s', filename='%s'" % \
                            (name, dataformat_name, path))

    return (output_list, data_sinks)