#!/usr/bin/python

import gevent
import gevent.pool
import gevent.queue
import gevent.monkey; gevent.monkey.patch_all()
import optparse
import time
import random

import generate_objects
import realistic
import common

class Result:
    TYPE_NONE = 0
    TYPE_READER = 1
    TYPE_WRITER = 2

    def __init__(self, name, type=TYPE_NONE, time=0, success=True, size=0, details=''):
        self.name = name
        self.type = type
        self.time = time
        self.success = success
        self.size = size
        self.details = details

    def __repr__(self):
        type_dict = {Result.TYPE_NONE: 'None', Result.TYPE_READER: 'Reader', Result.TYPE_WRITER: 'Writer'}
        type_s = type_dict[self.type]
        if self.success:
            status = 'Success'
        else:
            status = 'FAILURE'

        if (self.time == 0):
            mbps = '?'
        else:
            mbps = self.size / self.time / 1024.0

        return "<Result: [{success}] {type}{name} -- {size} KB in {time}s = {mbps} MB/s {details}>".format(
            success=status,
            type=type_s,
            name=self.name,
            size=self.size,
            time=self.time,
            mbps=mbps,
            details=self.details,
            )

def reader(bucket, name, queue):
    while (1):
        count = 0
        for key in bucket.list():
            fp = realistic.FileVerifier()
            start = time.time()
            key.get_contents_to_file(fp)
            end = time.time()
            elapsed = end - start
            queue.put(
                Result(
                    name,
                    type=Result.TYPE_READER,
                    time=elapsed,
                    success=fp.valid(),
                    size=fp.size / 1024,
                    ),
                )
            count += 1
        if count == 0:
            gevent.sleep(1)

def writer(bucket, name, queue, quantity=1, file_size=1, file_stddev=0, file_name_seed=None):
    while (1):
        r = random.randint(0, 65535)
        r2 = r
        if file_name_seed != None:
            r2 = file_name_seed

        files = generate_objects.get_random_files(
            quantity=quantity,
            mean=1024 * file_size,
            stddev=1024 * file_stddev,
            seed=r,
            )

        start = time.time()
        generate_objects.upload_objects(bucket, files, r2)
        end = time.time()
        elapsed = end - start

        queue.put(Result(name,
            type=Result.TYPE_WRITER,
            time=elapsed,
            size=sum(f.size/1024 for f in files),
            )
        )

def parse_options():
    parser = optparse.OptionParser()
    parser.add_option("-t", "--time", dest="duration", type="float",
        help="duration to run tests (seconds)", default=5, metavar="SECS")
    parser.add_option("-r", "--read", dest="num_readers", type="int",
        help="number of reader threads", default=0, metavar="NUM")
    parser.add_option("-w", "--write", dest="num_writers", type="int",
        help="number of writer threads", default=2, metavar="NUM")
    parser.add_option("-s", "--size", dest="file_size", type="float",
        help="file size to use, in kb", default=1024, metavar="KB")
    parser.add_option("-q", "--quantity", dest="quantity", type="int",
        help="number of files per batch", default=1, metavar="NUM")
    parser.add_option("-d", "--stddev", dest="stddev", type="float",
        help="stddev of file size", default=0, metavar="KB")
    parser.add_option("-W", "--rewrite", dest="rewrite", action="store_true",
        help="rewrite the same files (total=quantity)")
    parser.add_option("--no-cleanup", dest="cleanup", action="store_false",
        help="skip cleaning up all created buckets", default=True)

    return parser.parse_args()

def main():
    # parse options
    (options, args) = parse_options()

    try:
        # setup
        common.setup()
        bucket = common.get_new_bucket()
        print "Created bucket: {name}".format(name=bucket.name)
        r = None
        if (options.rewrite):
            r = random.randint(0, 65535)
        q = gevent.queue.Queue()

        # main work
        print "Using file size: {size} +- {stddev}".format(size=options.file_size, stddev=options.stddev)
        print "Spawning {r} readers and {w} writers...".format(r=options.num_readers, w=options.num_writers)
        group = gevent.pool.Group()
        for x in xrange(options.num_writers):
            group.spawn(writer, bucket,
                        name=x,
                        queue=q,
                        file_size=options.file_size,
                        file_stddev=options.stddev,
                        quantity=options.quantity,
                        file_name_seed=r,
                        )
        for x in xrange(options.num_readers):
            group.spawn(reader, bucket,
                        name=x,
                        queue=q,
                        )
        def stop():
            group.kill(block=True)
            q.put(StopIteration)
        gevent.spawn_later(options.duration, stop)

        total_read = 0
        total_write = 0
        read_success = 0
        read_failure = 0
        write_success = 0
        write_failure = 0
        for item in q:
            print item
            if item.type == Result.TYPE_READER:
                if item.success:
                    read_success += 1
                    total_read += item.size
                else:
                    read_failure += 1
            elif item.type == Result.TYPE_WRITER:
                if item.success:
                    write_success += 1
                    total_write += item.size
                else:
                    write_failure += 1

        # overall stats
        print "--- Stats ---"
        print "Total Read:  {read} MB ({mbps} MB/s)".format(
            read=(total_read/1024.0),
            mbps=(total_read/1024.0/options.duration),
            )
        print "Total Write: {write} MB ({mbps} MB/s)".format(
            write=(total_write/1024.0),
            mbps=(total_write/1024.0/options.duration),
            )
        print "Read filures: {num} ({percent}%)".format(
            num=read_failure,
            percent=(100.0*read_failure/max(read_failure+read_success, 1)),
            )
        print "Write failures: {num} ({percent}%)".format(
            num=write_failure,
            percent=(100.0*write_failure/max(write_failure+write_success, 1)),
            )

    except Exception as e:
        print e
    finally:
        # cleanup
        if options.cleanup:
            common.teardown()