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""" |
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Helper methods for running and documenting processors |
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""" |
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from time import perf_counter, process_time |
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from functools import lru_cache |
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import json |
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import inspect |
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from subprocess import run |
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from typing import List, Optional |
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from ..workspace import Workspace |
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from ocrd_utils import freeze_args, getLogger, config, setOverrideLogLevel, getLevelName, sparkline |
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__all__ = [ |
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'run_cli', |
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'run_processor' |
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] |
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def _get_workspace(workspace=None, resolver=None, mets_url=None, working_dir=None, mets_server_url=None): |
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if workspace is None: |
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if resolver is None: |
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raise Exception("Need to pass a resolver to create a workspace") |
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if mets_url is None: |
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raise Exception("Need to pass mets_url to create a workspace") |
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workspace = resolver.workspace_from_url(mets_url, dst_dir=working_dir, mets_server_url=mets_server_url) |
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return workspace |
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def run_processor( |
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processorClass, |
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mets_url=None, |
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resolver=None, |
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workspace=None, |
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page_id=None, |
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log_level=None, |
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input_file_grp=None, |
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output_file_grp=None, |
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parameter=None, |
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working_dir=None, |
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mets_server_url=None, |
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instance_caching=False |
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): # pylint: disable=too-many-locals |
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""" |
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Instantiate a Pythonic processor, open a workspace, run the processor and save the workspace. |
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If :py:attr:`workspace` is not none, reuse that. Otherwise, instantiate an |
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:py:class:`~ocrd.Workspace` for :py:attr:`mets_url` (and :py:attr:`working_dir`) |
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by using :py:meth:`ocrd.Resolver.workspace_from_url` (i.e. open or clone local workspace). |
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Instantiate a Python object for :py:attr:`processorClass`, passing: |
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- the workspace, |
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- :py:attr:`page_id` |
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- :py:attr:`input_file_grp` |
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- :py:attr:`output_file_grp` |
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- :py:attr:`parameter` (after applying any :py:attr:`parameter_override` settings) |
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Warning: Avoid setting the `instance_caching` flag to True. It may have unexpected side effects. |
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This flag is used for an experimental feature we would like to adopt in future. |
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Run the processor on the workspace (creating output files in the filesystem). |
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Finally, write back the workspace (updating the METS in the filesystem). |
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Args: |
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processorClass (object): Python class of the module processor. |
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""" |
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if log_level: |
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setOverrideLogLevel(log_level) |
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workspace = _get_workspace( |
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workspace, |
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resolver, |
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mets_url, |
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working_dir, |
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mets_server_url |
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) |
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log = getLogger('ocrd.processor.helpers.run_processor') |
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log.debug("Running processor %s", processorClass) |
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processor = get_processor( |
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processorClass, |
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parameter=parameter, |
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workspace=None, |
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page_id=page_id, |
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input_file_grp=input_file_grp, |
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output_file_grp=output_file_grp, |
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instance_caching=instance_caching |
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) |
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ocrd_tool = processor.ocrd_tool |
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name = '%s v%s' % (ocrd_tool['executable'], processor.version) |
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otherrole = ocrd_tool['steps'][0] |
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logProfile = getLogger('ocrd.process.profile') |
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log.debug("Processor instance %s (%s doing %s)", processor, name, otherrole) |
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t0_wall = perf_counter() |
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t0_cpu = process_time() |
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if any(x in config.OCRD_PROFILE for x in ['RSS', 'PSS']): |
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backend = 'psutil_pss' if 'PSS' in config.OCRD_PROFILE else 'psutil' |
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from memory_profiler import memory_usage # pylint: disable=import-outside-toplevel |
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try: |
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mem_usage = memory_usage(proc=(processor.process_workspace, [workspace], {}), |
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# only run process once |
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max_iterations=1, |
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interval=.1, timeout=None, timestamps=True, |
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# include sub-processes |
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multiprocess=True, include_children=True, |
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# get proportional set size instead of RSS |
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backend=backend) |
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except Exception as err: |
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log.exception("Failure in processor '%s'" % ocrd_tool['executable']) |
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raise err |
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mem_usage_values = [mem for mem, _ in mem_usage] |
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mem_output = 'memory consumption: ' |
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mem_output += sparkline(mem_usage_values) |
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mem_output += ' max: %.2f MiB min: %.2f MiB' % (max(mem_usage_values), min(mem_usage_values)) |
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logProfile.info(mem_output) |
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else: |
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try: |
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processor.process_workspace(workspace) |
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except Exception as err: |
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log.exception("Failure in processor '%s'" % ocrd_tool['executable']) |
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raise err |
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t1_wall = perf_counter() - t0_wall |
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t1_cpu = process_time() - t0_cpu |
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logProfile.info("Executing processor '%s' took %fs (wall) %fs (CPU)( [--input-file-grp='%s' --output-file-grp='%s' --parameter='%s' --page-id='%s']" % ( |
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ocrd_tool['executable'], |
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t1_wall, |
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t1_cpu, |
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processor.input_file_grp or '', |
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processor.output_file_grp or '', |
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json.dumps(processor.parameter) or '', |
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processor.page_id or '' |
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)) |
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workspace.mets.add_agent( |
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name=name, |
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_type='OTHER', |
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othertype='SOFTWARE', |
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role='OTHER', |
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otherrole=otherrole, |
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notes=[({'option': 'input-file-grp'}, processor.input_file_grp or ''), |
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({'option': 'output-file-grp'}, processor.output_file_grp or ''), |
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({'option': 'parameter'}, json.dumps(processor.parameter or '')), |
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({'option': 'page-id'}, processor.page_id or '')] |
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) |
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workspace.save_mets() |
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return processor |
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def run_cli( |
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executable, |
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mets_url=None, |
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resolver=None, |
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workspace=None, |
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page_id=None, |
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overwrite=None, |
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debug=None, |
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log_level=None, |
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log_filename=None, |
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input_file_grp=None, |
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output_file_grp=None, |
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parameter=None, |
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working_dir=None, |
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mets_server_url=None, |
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): |
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""" |
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Open a workspace and run a processor on the command line. |
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If :py:attr:`workspace` is not none, reuse that. Otherwise, instantiate an |
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:py:class:`~ocrd.Workspace` for :py:attr:`mets_url` (and :py:attr:`working_dir`) |
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by using :py:meth:`ocrd.Resolver.workspace_from_url` (i.e. open or clone local workspace). |
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Run the processor CLI :py:attr:`executable` on the workspace, passing: |
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- the workspace, |
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- :py:attr:`page_id` |
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- :py:attr:`input_file_grp` |
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- :py:attr:`output_file_grp` |
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- :py:attr:`parameter` (after applying any :py:attr:`parameter_override` settings) |
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(Will create output files and update the in the filesystem). |
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Args: |
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executable (string): Executable name of the module processor. |
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""" |
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workspace = _get_workspace(workspace, resolver, mets_url, working_dir) |
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args = [executable, '--working-dir', workspace.directory] |
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args += ['--mets', mets_url] |
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if log_level: |
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args += ['--log-level', log_level if isinstance(log_level, str) else getLevelName(log_level)] |
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if page_id: |
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args += ['--page-id', page_id] |
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if input_file_grp: |
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args += ['--input-file-grp', input_file_grp] |
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if output_file_grp: |
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args += ['--output-file-grp', output_file_grp] |
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if parameter: |
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args += ['--parameter', parameter] |
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if overwrite: |
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args += ['--overwrite'] |
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if debug: |
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args += ['--debug'] |
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if mets_server_url: |
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args += ['--mets-server-url', mets_server_url] |
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log = getLogger('ocrd.processor.helpers.run_cli') |
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log.debug("Running subprocess '%s'", ' '.join(args)) |
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if not log_filename: |
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result = run(args, check=False) |
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else: |
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with open(log_filename, 'a', encoding='utf-8') as file_desc: |
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result = run(args, check=False, stdout=file_desc, stderr=file_desc) |
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return result.returncode |
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# not decorated here but at runtime (on first use) |
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#@freeze_args |
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#@lru_cache(maxsize=config.OCRD_MAX_PROCESSOR_CACHE) |
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def get_cached_processor(parameter: dict, processor_class): |
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""" |
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Call this function to get back an instance of a processor. |
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The results are cached based on the parameters. |
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Args: |
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parameter (dict): a dictionary of parameters. |
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processor_class: the concrete `:py:class:~ocrd.Processor` class. |
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Returns: |
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When the concrete class of the processor is unknown, `None` is returned. |
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Otherwise, an instance of the `:py:class:~ocrd.Processor` is returned. |
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""" |
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if processor_class: |
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processor = processor_class(None, parameter=dict(parameter)) |
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return processor |
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return None |
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def get_processor( |
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processor_class, |
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parameter: Optional[dict] = None, |
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workspace: Workspace = None, |
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page_id: str = None, |
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input_file_grp: List[str] = None, |
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output_file_grp: List[str] = None, |
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instance_caching: bool = False, |
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): |
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if processor_class: |
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if parameter is None: |
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parameter = {} |
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if instance_caching: |
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global get_cached_processor |
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if not hasattr(get_cached_processor, '__wrapped__'): |
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# first call: wrap |
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if processor_class.max_instances < 0: |
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maxsize = config.OCRD_MAX_PROCESSOR_CACHE |
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else: |
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maxsize = min(config.OCRD_MAX_PROCESSOR_CACHE, processor_class.max_instances) |
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# wrapping in call cache |
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# wrapping dict into frozendict (from https://github.com/OCR-D/core/pull/884) |
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get_cached_processor = freeze_args(lru_cache(maxsize=maxsize)(get_cached_processor)) |
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processor = get_cached_processor(parameter, processor_class) |
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else: |
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# avoid passing workspace already (deprecated chdir behaviour) |
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processor = processor_class(None, parameter=parameter) |
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# set current processing parameters |
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processor.workspace = workspace |
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processor.page_id = page_id |
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processor.input_file_grp = input_file_grp |
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processor.output_file_grp = output_file_grp |
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return processor |
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raise ValueError("Processor class is not known") |
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OCR-D /
core
