#!/usr/bin/env python

# Test whether a client sends a correct PUBLISH to a topic with QoS 2.

# The client should connect to port 1888 with keepalive=60, clean session set,
# and client id publish-qos2-test
# The test will send a CONNACK message to the client with rc=0. Upon receiving
# the CONNACK the client should verify that rc==0. If not, it should exit with
# return code=1.
# On a successful CONNACK, the client should send a PUBLISH message with topic
# "pub/qos2/test", payload "message" and QoS=2.
# The test will not respond to the first PUBLISH message, so the client must
# resend the PUBLISH message with dup=1. Note that to keep test durations low, a
# message retry timeout of less than 10 seconds is required for this test.
# On receiving the second PUBLISH message, the test will send the correct
# PUBREC response. On receiving the correct PUBREC response, the client should
# send a PUBREL message.
# The test will not respond to the first PUBREL message, so the client must
# resend the PUBREL message with dup=1. On receiving the second PUBREL message,
# the test will send the correct PUBCOMP response. On receiving the correct
# PUBCOMP response, the client should send a DISCONNECT message.

import inspect
import os
import subprocess
import socket
import sys
import time

# From http://stackoverflow.com/questions/279237/python-import-a-module-from-a-folder
cmd_subfolder = os.path.realpath(os.path.abspath(os.path.join(os.path.split(inspect.getfile( inspect.currentframe() ))[0],"..")))
if cmd_subfolder not in sys.path:
    sys.path.insert(0, cmd_subfolder)

import mosq_test

rc = 1
keepalive = 60
connect_packet = mosq_test.gen_connect("publish-qos2-test", keepalive=keepalive)
connack_packet = mosq_test.gen_connack(rc=0)

disconnect_packet = mosq_test.gen_disconnect()

mid = 1
publish_packet = mosq_test.gen_publish("pub/qos2/test", qos=2, mid=mid, payload="message")
publish_dup_packet = mosq_test.gen_publish("pub/qos2/test", qos=2, mid=mid, payload="message", dup=True)
pubrec_packet = mosq_test.gen_pubrec(mid)
pubrel_packet = mosq_test.gen_pubrel(mid)
pubcomp_packet = mosq_test.gen_pubcomp(mid)

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.settimeout(10)
sock.bind(('', 1888))
sock.listen(5)

client_args = sys.argv[1:]
env = dict(os.environ)
env['LD_LIBRARY_PATH'] = '../../lib:../../lib/cpp'
try:
    pp = env['PYTHONPATH']
except KeyError:
    pp = ''
env['PYTHONPATH'] = '../../lib/python:'+pp
client = subprocess.Popen(client_args, env=env)

try:
    (conn, address) = sock.accept()
    conn.settimeout(10)

    if mosq_test.expect_packet(conn, "connect", connect_packet):
        conn.send(connack_packet)

        if mosq_test.expect_packet(conn, "publish", publish_packet):
            conn.send(pubrec_packet)
                
            if mosq_test.expect_packet(conn, "pubrel", pubrel_packet):
                conn.send(pubcomp_packet)

                if mosq_test.expect_packet(conn, "disconnect", disconnect_packet):
                    rc = 0

    conn.close()
finally:
    client.terminate()
    client.wait()
    sock.close()

exit(rc)
