""" Usage: %s [OPTIONS] <instance id> <queries file>

Stress test a CubicWeb repository

OPTIONS:

  -h / --help

     Display this help message and exit.

  -u / --user <user>

     Connect as <user> instead of being prompted to give it.

  -p / --password <password>

     Automatically give <password> for authentication instead of being prompted

     to give it.

  -n / --nb-times <num>

     Repeat queries <num> times.

  -t / --nb-threads <num>

     Execute queries in <num> parallel threads.

  -P / --profile <prof_file>

     dumps profile results (hotshot) in <prof_file>

  -o / --report-output <filename>

     Write profiler report into <filename> rather than on stdout

Copyright (c) 2003-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.

http://www.logilab.fr/ -- mailto:contact@logilab.fr

:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses

"""

import os

import sys

import threading

import getopt

import traceback

from getpass import getpass

from os.path import basename

from time import clock

from logilab.common.fileutils import lines

from logilab.common.ureports import Table, TextWriter

from cubicweb.server.repository import Repository

from cubicweb.dbapi import Connection

TB_LOCK = threading.Lock()

class QueryExecutor:

    def __init__(self, cursor, times, queries, reporter = None):

        self._cursor = cursor

        self._times = times

        self._queries = queries

        self._reporter = reporter

    def run(self):

        cursor = self._cursor

        times = self._times

        while times:

            for index, query in enumerate(self._queries):

                start = clock()

                try:

                    cursor.execute(query)

                except KeyboardInterrupt:

                    raise

                except:

                    TB_LOCK.acquire()

                    traceback.print_exc()

                    TB_LOCK.release()

                    return

                if self._reporter is not None:

                    self._reporter.add_proftime(clock() - start, index)

            times -= 1

def usage(status=0):

    """print usage string and exit"""

    print __doc__ % basename(sys.argv[0])

    sys.exit(status)

class ProfileReporter:

    """a profile reporter gathers all profile informations from several

    threads and can write a report that summarizes all profile informations

    """

    profiler_lock = threading.Lock()

    def __init__(self, queries):

        self._queries = tuple(queries)

        self._profile_results = [(0., 0)] * len(self._queries)

        # self._table_report = Table(3, rheaders = True)

        len_max = max([len(query) for query in self._queries]) + 5

        self._query_fmt = '%%%ds' % len_max

    def add_proftime(self, elapsed_time, query_index):

        """add a new time measure for query"""

        ProfileReporter.profiler_lock.acquire()

        cumul_time, times = self._profile_results[query_index]

        cumul_time += elapsed_time

        times += 1.

        self._profile_results[query_index] = (cumul_time, times)

        ProfileReporter.profiler_lock.release()

    def dump_report(self, output = sys.stdout):

        """dump report in 'output'"""

        table_elems = ['RQL Query', 'Times', 'Avg Time']

        total_time = 0.

        for query, (cumul_time, times) in zip(self._queries, self._profile_results):

            avg_time = cumul_time / float(times)

            table_elems += [str(query), '%f' % times, '%f' % avg_time ]

            total_time += cumul_time

        table_elems.append('Total time :')

        table_elems.append(str(total_time))

        table_elems.append(' ')

        table_layout = Table(3, rheaders = True, children = table_elems)

        TextWriter().format(table_layout, output)

        # output.write('\n'.join(tmp_output))

def run(args):

    """run the command line tool"""

    try:

        opts, args = getopt.getopt(args, 'hn:t:u:p:P:o:', ['help', 'user=', 'password=',

                                                           'nb-times=', 'nb-threads=',

                                                           'profile', 'report-output=',])

    except Exception, ex:

        print ex

        usage(1)

    repeat = 100

    threads = 1

    user = os.environ.get('USER', os.environ.get('LOGNAME'))

    password = None

    report_output = sys.stdout

    prof_file = None

    for opt, val in opts:

        if opt in ('-h', '--help'):

            usage()

        if opt in ('-u', '--user'):

            user = val

        elif opt in ('-p', '--password'):

            password = val

        elif opt in ('-n', '--nb-times'):

            repeat = int(val)

        elif opt in ('-t', '--nb-threads'):

            threads = int(val)

        elif opt in ('-P', '--profile'):

            prof_file = val

        elif opt in ('-o', '--report-output'):

            report_output = file(val, 'w')

    if len(args) != 2:

        usage(1)

    queries =  [query for query in lines(args[1]) if not query.startswith('#')]

    if user is None:

        user = raw_input('login: ')

    if password is None:

        password = getpass('password: ')

    from cubicweb.cwconfig import instance_configuration

    config = instance_configuration(args[0])

    # get local access to the repository

    print "Creating repo", prof_file

    repo = Repository(config, prof_file)

    cnxid = repo.connect(user, password=password)

    # connection to the CubicWeb repository

    repo_cnx = Connection(repo, cnxid)

    repo_cursor = repo_cnx.cursor()

    reporter = ProfileReporter(queries)

    if threads > 1:

        executors = []

        while threads:

            qe = QueryExecutor(repo_cursor, repeat, queries, reporter = reporter)

            executors.append(qe)

            thread = threading.Thread(target=qe.run)

            qe.thread = thread

            thread.start()

            threads -= 1

        for qe in executors:

            qe.thread.join()

##         for qe in executors:

##             print qe.thread, repeat - qe._times, 'times'

    else:

        QueryExecutor(repo_cursor, repeat, queries, reporter = reporter).run()

    reporter.dump_report(report_output)

if __name__ == '__main__':

    run(sys.argv[1:])