run_mpas_analysis

#!/usr/bin/env python

"""
Runs MPAS-Analysis via a configuration file (e.g. `config.analysis`)
specifying analysis options.

Authors
-------
Xylar Asay-Davis, Phillip J. Wolfram
"""

from __future__ import absolute_import, division, print_function, \
    unicode_literals

import matplotlib as mpl
import argparse
import traceback
import sys
import pkg_resources
import shutil
import os
from collections import OrderedDict

from mpas_analysis.configuration import MpasAnalysisConfigParser

from mpas_analysis.shared.io.utility import build_config_full_path, \
    make_directories

from mpas_analysis.shared.html import generate_html

from mpas_analysis.shared import AnalysisTask


def build_analysis_list(config):  # {{{
    """
    Build a list of analysis tasks. New tasks should be added here, following
    the approach used for existing analysis tasks.

    Parameters
    ----------
    config : ``MpasAnalysisConfigParser`` object
        contains config options

    Returns
    -------
    analyses : list of ``AnalysisTask`` objects
        A list of all analysis tasks

    Authors
    -------
    Xylar Asay-Davis
    """

    # choose the right rendering backend, depending on whether we're displaying
    # to the screen
    if not config.getboolean('plot', 'displayToScreen'):
        mpl.use('Agg')

    # analysis can only be imported after the right MPL renderer is selected
    from mpas_analysis import ocean
    from mpas_analysis import sea_ice
    from mpas_analysis.shared.climatology import MpasClimatologyTask
    from mpas_analysis.shared.time_series import MpasTimeSeriesTask

    # analyses will be a list of analysis classes
    analyses = []

    # Ocean Analyses
    oceanClimatolgyTask = MpasClimatologyTask(config=config,
                                              componentName='ocean')
    oceanTimeSeriesTask = MpasTimeSeriesTask(config=config,
                                             componentName='ocean')
    oceanIndexTask = MpasTimeSeriesTask(config=config,
                                        componentName='ocean',
                                        section='index')
    analyses.append(oceanClimatolgyTask)
    analyses.append(ocean.ClimatologyMapMLD(config, oceanClimatolgyTask))
    analyses.append(ocean.ClimatologyMapSST(config, oceanClimatolgyTask))
    analyses.append(ocean.ClimatologyMapSSS(config, oceanClimatolgyTask))
    analyses.append(ocean.ClimatologyMapSoseTemperature(config,
                                                        oceanClimatolgyTask))
    analyses.append(ocean.ClimatologyMapSoseSalinity(config,
                                                     oceanClimatolgyTask))
    analyses.append(ocean.ClimatologyMapAntarcticMelt(config,
                                                      oceanClimatolgyTask))

    analyses.append(oceanTimeSeriesTask)
    analyses.append(ocean.TimeSeriesAntarcticMelt(config, oceanTimeSeriesTask))
    analyses.append(ocean.TimeSeriesOHC(config, oceanTimeSeriesTask))
    analyses.append(ocean.TimeSeriesSST(config, oceanTimeSeriesTask))
    analyses.append(ocean.MeridionalHeatTransport(config, oceanClimatolgyTask))
    analyses.append(ocean.StreamfunctionMOC(config, oceanClimatolgyTask))
    analyses.append(ocean.IndexNino34(config, oceanIndexTask))

    # Sea Ice Analyses
    seaIceClimatolgyTask = MpasClimatologyTask(config=config,
                                               componentName='seaIce')
    seaIceTimeSeriesTask = MpasTimeSeriesTask(config=config,
                                              componentName='seaIce')
    analyses.append(seaIceClimatolgyTask)
    analyses.append(sea_ice.ClimatologyMapSeaIceConc(config,
                                                     seaIceClimatolgyTask,
                                                     hemisphere='NH'))
    analyses.append(sea_ice.ClimatologyMapSeaIceThick(config,
                                                      seaIceClimatolgyTask,
                                                      hemisphere='NH'))
    analyses.append(sea_ice.ClimatologyMapSeaIceConc(config,
                                                     seaIceClimatolgyTask,
                                                     hemisphere='SH'))
    analyses.append(sea_ice.ClimatologyMapSeaIceThick(config,
                                                      seaIceClimatolgyTask,
                                                      hemisphere='SH'))
    analyses.append(seaIceTimeSeriesTask)
    analyses.append(sea_ice.TimeSeriesSeaIce(config, seaIceTimeSeriesTask))

    return analyses  # }}}


def determine_analyses_to_generate(analyses):  # {{{
    """
    Build a list of analysis tasks to run based on the 'generate' config
    option (or command-line flag) and prerequisites and subtasks of each
    requested task.  Each task's ``setup_and_check`` method is called in the
    process.

    Parameters
    ----------
    analyses : list of ``AnalysisTask`` objects
        A list of all analysis tasks

    Returns
    -------
    analysesToGenerate : list of ``AnalysisTask`` objects
        A list of analysis tasks to run

    Authors
    -------
    Xylar Asay-Davis
    """

    analysesToGenerate = OrderedDict()
    # check which analysis we actually want to generate and only keep those
    for analysisTask in analyses:
        # update the dictionary with this task and perhaps its subtasks
        add_task_and_subtasks(analysisTask, analysesToGenerate)

    return analysesToGenerate  # }}}


def add_task_and_subtasks(analysisTask, analysesToGenerate,
                          callCheckGenerate=True):
    # {{{
    """
    If a task has been requested through the generate config option or
    if it is a prerequisite of a requested task, add it to the dictionary of
    tasks to generate.

    Parameters
    ----------
    analysisTask : ``AnalysisTask``
        A task to be added

    analysesToGenerate : ``OrderedDict`` of ``AnalysisTask``
        The list of analysis tasks to be generated, which this call may
        update to include this task and its subtasks

    callCheckGenerate : bool
        Whether the ``check_generate`` method should be call for this task to
        see if it has been requested.  We skip this for subtasks and
        prerequisites, since they are needed by another task regardless of
        whether the user specifically requested them.

    Authors
    -------
    Xylar Asay-Davis
    """

    key = (analysisTask.taskName, analysisTask.subtaskName)
    if key in analysesToGenerate.keys():
        # The task was already added
        assert(analysisTask._setupStatus == 'success')
        return

    # for each anlaysis task, check if we want to generate this task
    # and if the analysis task has a valid configuration
    taskTitle = analysisTask.printTaskName
    if callCheckGenerate and not analysisTask.check_generate():
        # we don't need to add this task -- it wasn't requested
        return

    # first, we should try to add the prerequisites of this task and its
    # subtasks (if they aren't also subtasks for this task)
    prereqs = analysisTask.runAfterTasks
    for subtask in analysisTask.subtasks:
        for prereq in subtask.runAfterTasks:
            if prereq not in analysisTask.subtasks:
                prereqs.extend(subtask.runAfterTasks)

    for prereq in prereqs:
        add_task_and_subtasks(prereq, analysesToGenerate,
                              callCheckGenerate=False)
        if prereq._setupStatus != 'success':
            print(prereq._setupStatus)
            # a prereq failed setup_and_check
            print("ERROR: prerequisite task {} of analysis task {}"
                  " failed during check,\n"
                  "       so this task will not be run".format(
                      prereq.printTaskName, taskTitle))
            analysisTask._setupStatus = 'fail'
            return

    # make sure all prereqs have been set up successfully before trying to
    # set up this task -- this task's setup may depend on setup in the prereqs
    try:
        analysisTask.setup_and_check()
    except (Exception, BaseException):
        traceback.print_exc(file=sys.stdout)
        print("ERROR: analysis task {} failed during check and "
              "will not be run".format(taskTitle))
        analysisTask._setupStatus = 'fail'
        return

    # next, we should try to add the subtasks.  This is done after the current
    # analysis task has been set up in case subtasks depend on information
    # from the parent task
    for subtask in analysisTask.subtasks:
        add_task_and_subtasks(subtask, analysesToGenerate,
                              callCheckGenerate=False)
        if subtask._setupStatus != 'success':
            # a subtask failed setup_and_check
            print("ERROR: a subtask of analysis task {}"
                  " failed during check,\n"
                  "       so this task will not be run".format(taskTitle))
            analysisTask._setupStatus = 'fail'
            return

    analysesToGenerate[key] = analysisTask
    analysisTask._setupStatus = 'success'
    # }}}


def update_generate(config, generate):  # {{{
    """
    Update the 'generate' config option using a string from the command line.

    Parameters
    ----------
    config : ``MpasAnalysisConfigParser`` object
        contains config options

    generate : str
        a comma-separated string of generate flags: either names of analysis
        tasks or commands of the form ``all_<tag>`` or ``no_<tag>`` indicating
        that analysis with a given tag should be included or excluded).

    Authors
    -------
    Xylar Asay-Davis
    """

    # overwrite the 'generate' in config with a string that parses to
    # a list of string
    generateList = generate.split(',')
    generateString = ', '.join(["'{}'".format(element)
                                for element in generateList])
    generateString = '[{}]'.format(generateString)
    config.set('output', 'generate', generateString)  # }}}


def run_analysis(config, analyses):  # {{{
    """
    Run all the tasks, either in serial or in parallel

    Parameters
    ----------
    config : ``MpasAnalysisConfigParser`` object
        contains config options

    analyses : OrderedDict of ``AnalysisTask`` objects
        A dictionary of analysis tasks to run with (task, subtask) names as
        keys

    Authors
    -------
    Xylar Asay-Davis
    """

    taskCount = config.getWithDefault('execute', 'parallelTaskCount',
                                      default=1)

    isParallel = taskCount > 1 and len(analyses) > 1

    for analysisTask in analyses.values():
        if not analysisTask.runAfterTasks and not analysisTask.subtasks:
            analysisTask._runStatus.value = AnalysisTask.READY
        else:
            analysisTask._runStatus.value = AnalysisTask.BLOCKED

    tasksWithErrors = []
    runningTasks = {}

    # run each analysis task
    while True:
        # we still have tasks to run
        for analysisTask in analyses.values():
            if analysisTask._runStatus.value == AnalysisTask.BLOCKED:
                prereqs = analysisTask.runAfterTasks + analysisTask.subtasks
                prereqStatus = [prereq._runStatus.value for prereq in prereqs]
                if any([runStatus == AnalysisTask.FAIL for runStatus in
                        prereqStatus]):
                    # a prerequisite failed so this task cannot succeed
                    analysisTask._runStatus.value = AnalysisTask.FAIL
                if all([runStatus == AnalysisTask.SUCCESS for runStatus in
                        prereqStatus]):
                    # no unfinished prerequisites so we can run this task
                    analysisTask._runStatus.value = AnalysisTask.READY

        unfinishedCount = 0
        for analysisTask in analyses.values():
            if analysisTask._runStatus.value not in [AnalysisTask.SUCCESS,
                                                     AnalysisTask.FAIL]:
                unfinishedCount += 1

        if unfinishedCount <= 0:
            # we're done
            break

        # launch new tasks
        for key, analysisTask in analyses.items():
            if analysisTask._runStatus.value == AnalysisTask.READY:
                if isParallel:
                    print('Running {}'.format(analysisTask.printTaskName))
                    analysisTask._runStatus.value = AnalysisTask.RUNNING
                    analysisTask.start()
                    runningTasks[key] = analysisTask
                    if len(runningTasks.keys()) >= taskCount:
                        break
                else:
                    analysisTask.run(writeLogFile=False)

        if isParallel:
            # wait for a task to finish
            analysisTask = wait_for_task(runningTasks)
            key = (analysisTask.taskName, analysisTask.subtaskName)
            runningTasks.pop(key)

            taskTitle = analysisTask.printTaskName

            if analysisTask._runStatus.value == AnalysisTask.SUCCESS:
                print("   Task {} has finished successfully.".format(
                        taskTitle))
            elif analysisTask._runStatus.value == AnalysisTask.FAIL:
                print("ERROR in task {}.  See log file {} for details".format(
                    taskTitle, analysisTask._logFileName))
                tasksWithErrors.append(taskTitle)
            else:
                print("Unexpected status from in task {}.  This may be a "
                      "bug.".format(taskTitle))
        else:
            if analysisTask._runStatus.value == AnalysisTask.FAIL:
                sys.exit(1)

    if not isParallel and config.getboolean('plot', 'displayToScreen'):
        import matplotlib.pyplot as plt
        plt.show()

    # raise the last exception so the process exits with an error
    errorCount = len(tasksWithErrors)
    if errorCount == 1:
        print("There were errors in task {}".format(tasksWithErrors[0]))
        sys.exit(1)
    elif errorCount > 0:
        print("There were errors in {} tasks: {}".format(
            errorCount, ', '.join(tasksWithErrors)))
        sys.exit(1)
    # }}}


def wait_for_task(runningTasks, timeout=0.1):  # {{{
    """
    Build a list of analysis modules based on the 'generate' config option.
    New tasks should be added here, following the approach used for existing
    analysis tasks.

    Parameters
    ----------
    runningTasks : dict of ``AnalysisTasks``
        The tasks that are currently running, with task names as keys

    Returns
    -------
    analysisTask : ``AnalysisTasks``
        A task that finished

    Authors
    -------
    Xylar Asay-Davis
    """
    # necessary to have a timeout so we can kill the whole thing
    # with a keyboard interrupt
    while True:
        for analysisTask in runningTasks.values():
            analysisTask.join(timeout=timeout)
            if not analysisTask.is_alive():
                return analysisTask  # }}}


if __name__ == "__main__":

    parser = argparse.ArgumentParser(
        description=__doc__, formatter_class=argparse.RawTextHelpFormatter)
    parser.add_argument("--setup_only", dest="setup_only", action='store_true',
                        help="If only the setup phase, not the run or HTML "
                        "generation phases, should be executed.")
    parser.add_argument("--html_only", dest="html_only", action='store_true',
                        help="If only the setup and HTML generation phases, "
                        "not the run phase, should be executed.")
    parser.add_argument("-g", "--generate", dest="generate",
                        help="A list of analysis modules to generate "
                        "(nearly identical generate option in config file).",
                        metavar="ANALYSIS1[,ANALYSIS2,ANALYSIS3,...]")
    parser.add_argument("-l", "--list", dest="list", action='store_true',
                        help="List the available analysis tasks")
    parser.add_argument("-p", "--purge", dest="purge", action='store_true',
                        help="Purge the analysis by deleting the output"
                        "directory before running")
    parser.add_argument('configFiles', metavar='CONFIG',
                        type=str, nargs='*', help='config file')
    args = parser.parse_args()

    # add config.default to cover default not included in the config files
    # provided on the command line
    if pkg_resources.resource_exists('mpas_analysis', 'config.default'):
        defaultConfig = pkg_resources.resource_filename('mpas_analysis',
                                                        'config.default')
        configFiles = [defaultConfig] + args.configFiles
    else:
        print('WARNING: Did not find config.default.  Assuming other config '
              'file(s) contain a\n'
              'full set of configuration options.')
        configFiles = args.configFiles

    config = MpasAnalysisConfigParser()
    config.read(configFiles)

    if args.list:
        analyses = build_analysis_list(config)
        for analysisTask in analyses:
            print('task: {}'.format(analysisTask.taskName))
            print('    component: {}'.format(analysisTask.componentName)),
            print('    tags: {}'.format(', '.join(analysisTask.tags)))
        sys.exit(0)

    if args.purge:
        outputDirectory = config.get('output', 'baseDirectory')
        if not os.path.exists(outputDirectory):
            print('Output directory {} does not exist.\n'
                  'No purge necessary.'.format(outputDirectory))
        else:
            print('Deleting contents of {}'.format(outputDirectory))
            shutil.rmtree(outputDirectory)

    if args.generate:
        update_generate(config, args.generate)

    logsDirectory = build_config_full_path(config, 'output',
                                           'logsSubdirectory')
    make_directories(logsDirectory)
    make_directories('{}/configs/'.format(logsDirectory))

    analyses = build_analysis_list(config)
    analyses = determine_analyses_to_generate(analyses)

    if not args.setup_only and not args.html_only:
        run_analysis(config, analyses)

    if not args.setup_only:
        generate_html(config, analyses)

# vim: foldmethod=marker ai ts=4 sts=4 et sw=4 ft=python