#! /usr/bin/python

import os
import sys
import glob
import optparse
import tempfile
import logging
import shutil
import ConfigParser

class Fail(Exception):
    def __init__(self, test, msg):
        self.msg = msg
        self.test = test
    def getMsg(self):
        return '\'%s\' - %s' % (self.test.path, self.msg)

class Unsup(Exception):
    def __init__(self, test):
        self.test = test
    def getMsg(self):
        return '\'%s\'' % self.test.path

class Event(dict):
    terms = [
        'flags',
        'type',
        'size',
        'config',
        'sample_period',
        'sample_type',
        'read_format',
        'disabled',
        'inherit',
        'pinned',
        'exclusive',
        'exclude_user',
        'exclude_kernel',
        'exclude_hv',
        'exclude_idle',
        'mmap',
        'comm',
        'freq',
        'inherit_stat',
        'enable_on_exec',
        'task',
        'watermark',
        'precise_ip',
        'mmap_data',
        'sample_id_all',
        'exclude_host',
        'exclude_guest',
        'exclude_callchain_kernel',
        'exclude_callchain_user',
        'wakeup_events',
        'bp_type',
        'config1',
        'config2',
        'branch_sample_type',
        'sample_regs_user',
        'sample_stack_user',
    ]

    def add(self, data):
        for key, val in data:
            log.debug("      %s = %s" % (key, val))
            self[key] = val

    def __init__(self, name, data, base):
        log.info("    Event %s" % name);
        self.name  = name;
        self.group = ''
        self.add(base)
        self.add(data)

    def compare_data(self, a, b):
        # Allow multiple values in assignment separated by '|'
        a_list = a.split('|')
        b_list = b.split('|')

        for a_item in a_list:
            for b_item in b_list:
                if (a_item == b_item):
                    return True
                elif (a_item == '*') or (b_item == '*'):
                    return True

        return False

    def equal(self, other):
        for t in Event.terms:
            log.debug("      [%s] %s %s" % (t, self[t], other[t]));
            if not self.has_key(t) or not other.has_key(t):
                return False
            if not self.compare_data(self[t], other[t]):
                return False
        return True

# Test file description needs to have following sections:
# [config]
#   - just single instance in file
#   - needs to specify:
#     'command' - perf command name
#     'args'    - special command arguments
#     'ret'     - expected command return value (0 by default)
#
# [eventX:base]
#   - one or multiple instances in file
#   - expected values assignments
class Test(object):
    def __init__(self, path, options):
        parser = ConfigParser.SafeConfigParser()
        parser.read(path)

        log.warning("running '%s'" % path)

        self.path     = path
        self.test_dir = options.test_dir
        self.perf     = options.perf
        self.command  = parser.get('config', 'command')
        self.args     = parser.get('config', 'args')

        try:
            self.ret  = parser.get('config', 'ret')
        except:
            self.ret  = 0

        self.expect   = {}
        self.result   = {}
        log.info("  loading expected events");
        self.load_events(path, self.expect)

    def is_event(self, name):
        if name.find("event") == -1:
            return False
        else:
            return True

    def load_events(self, path, events):
        parser_event = ConfigParser.SafeConfigParser()
        parser_event.read(path)

        # The event record section header contains 'event' word,
        # optionaly followed by ':' allowing to load 'parent
        # event' first as a base
        for section in filter(self.is_event, parser_event.sections()):

            parser_items = parser_event.items(section);
            base_items   = {}

            # Read parent event if there's any
            if (':' in section):
                base = section[section.index(':') + 1:]
                parser_base = ConfigParser.SafeConfigParser()
                parser_base.read(self.test_dir + '/' + base)
                base_items = parser_base.items('event')

            e = Event(section, parser_items, base_items)
            events[section] = e

    def run_cmd(self, tempdir):
        cmd = "PERF_TEST_ATTR=%s %s %s -o %s/perf.data %s" % (tempdir,
              self.perf, self.command, tempdir, self.args)
        ret = os.WEXITSTATUS(os.system(cmd))

        log.info("  running '%s' ret %d " % (cmd, ret))

        if ret != int(self.ret):
            raise Unsup(self)

    def compare(self, expect, result):
        match = {}

        log.info("  compare");

        # For each expected event find all matching
        # events in result. Fail if there's not any.
        for exp_name, exp_event in expect.items():
            exp_list = []
            log.debug("    matching [%s]" % exp_name)
            for res_name, res_event in result.items():
                log.debug("      to [%s]" % res_name)
                if (exp_event.equal(res_event)):
                    exp_list.append(res_name)
                    log.debug("    ->OK")
                else:
                    log.debug("    ->FAIL");

            log.info("    match: [%s] matches %s" % (exp_name, str(exp_list)))

            # we did not any matching event - fail
            if (not exp_list):
                raise Fail(self, 'match failure');

            match[exp_name] = exp_list

        # For each defined group in the expected events
        # check we match the same group in the result.
        for exp_name, exp_event in expect.items():
            group = exp_event.group

            if (group == ''):
                continue

            for res_name in match[exp_name]:
                res_group = result[res_name].group
                if res_group not in match[group]:
                    raise Fail(self, 'group failure')

                log.info("    group: [%s] matches group leader %s" %
                         (exp_name, str(match[group])))

        log.info("  matched")

    def resolve_groups(self, events):
        for name, event in events.items():
            group_fd = event['group_fd'];
            if group_fd == '-1':
                continue;

            for iname, ievent in events.items():
                if (ievent['fd'] == group_fd):
                    event.group = iname
                    log.debug('[%s] has group leader [%s]' % (name, iname))
                    break;

    def run(self):
        tempdir = tempfile.mkdtemp();

        # run the test script
        self.run_cmd(tempdir);

        # load events expectation for the test
        log.info("  loading result events");
        for f in glob.glob(tempdir + '/event*'):
            self.load_events(f, self.result);

        # resolve group_fd to event names
        self.resolve_groups(self.expect);
        self.resolve_groups(self.result);

        # do the expectation - results matching - both ways
        self.compare(self.expect, self.result)
        self.compare(self.result, self.expect)

        # cleanup
        shutil.rmtree(tempdir)


def run_tests(options):
    for f in glob.glob(options.test_dir + '/' + options.test):
        try:
            Test(f, options).run()
        except Unsup, obj:
            log.warning("unsupp  %s" % obj.getMsg())

def setup_log(verbose):
    global log
    level = logging.CRITICAL

    if verbose == 1:
        level = logging.WARNING
    if verbose == 2:
        level = logging.INFO
    if verbose >= 3:
        level = logging.DEBUG

    log = logging.getLogger('test')
    log.setLevel(level)
    ch  = logging.StreamHandler()
    ch.setLevel(level)
    formatter = logging.Formatter('%(message)s')
    ch.setFormatter(formatter)
    log.addHandler(ch)

USAGE = '''%s [OPTIONS]
  -d dir  # tests dir
  -p path # perf binary
  -t test # single test
  -v      # verbose level
''' % sys.argv[0]

def main():
    parser = optparse.OptionParser(usage=USAGE)

    parser.add_option("-t", "--test",
                      action="store", type="string", dest="test")
    parser.add_option("-d", "--test-dir",
                      action="store", type="string", dest="test_dir")
    parser.add_option("-p", "--perf",
                      action="store", type="string", dest="perf")
    parser.add_option("-v", "--verbose",
                      action="count", dest="verbose")

    options, args = parser.parse_args()
    if args:
        parser.error('FAILED wrong arguments %s' %  ' '.join(args))
        return -1

    setup_log(options.verbose)

    if not options.test_dir:
        print 'FAILED no -d option specified'
        sys.exit(-1)

    if not options.test:
        options.test = 'test*'

    try:
        run_tests(options)

    except Fail, obj:
        print "FAILED %s" % obj.getMsg();
        sys.exit(-1)

    sys.exit(0)

if __name__ == '__main__':
    main()