#!/usr/bin/env python3

import unittest
from framework import VppTestCase
from asfframework import VppTestRunner
from util import ppp
from scapy.packet import Raw
from scapy.layers.inet import IP, UDP
from syslog_rfc5424_parser import SyslogMessage, ParseError
from syslog_rfc5424_parser.constants import SyslogFacility, SyslogSeverity
from vpp_papi import VppEnum


class TestSyslog(VppTestCase):
    """Syslog Protocol Test Cases"""

    @property
    def SYSLOG_SEVERITY(self):
        return VppEnum.vl_api_syslog_severity_t

    @classmethod
    def setUpClass(cls):
        super(TestSyslog, cls).setUpClass()

        try:
            (cls.pg0,) = cls.create_pg_interfaces(range(1))
            cls.pg0.admin_up()
            cls.pg0.config_ip4()
            cls.pg0.resolve_arp()

        except Exception:
            super(TestSyslog, cls).tearDownClass()
            raise

    @classmethod
    def tearDownClass(cls):
        super(TestSyslog, cls).tearDownClass()

    def syslog_generate(self, facility, severity, appname, msgid, sd=None, msg=None):
        """
        Generate syslog message

        :param facility: facility value
        :param severity: severity level
        :param appname: application name that originate message
        :param msgid: message identifier
        :param sd: structured data (optional)
        :param msg: free-form message (optional)
        """
        facility_str = [
            "kernel",
            "user-level",
            "mail-system",
            "system-daemons",
            "security-authorization",
            "syslogd",
            "line-printer",
            "network-news",
            "uucp",
            "clock-daemon",
            "",
            "ftp-daemon",
            "ntp-subsystem",
            "log-audit",
            "log-alert",
            "",
            "local0",
            "local1",
            "local2",
            "local3",
            "local4",
            "local5",
            "local6",
            "local7",
        ]

        severity_str = [
            "emergency",
            "alert",
            "critical",
            "error",
            "warning",
            "notice",
            "informational",
            "debug",
        ]

        cli_str = "test syslog %s %s %s %s" % (
            facility_str[facility],
            severity_str[severity],
            appname,
            msgid,
        )
        if sd is not None:
            for sd_id, sd_params in sd.items():
                cli_str += " sd-id %s" % (sd_id)
                for name, value in sd_params.items():
                    cli_str += " sd-param %s %s" % (name, value)
        if msg is not None:
            cli_str += " %s" % (msg)
        self.vapi.cli(cli_str)

    def syslog_verify(
        self, data, facility, severity, appname, msgid, sd=None, msg=None
    ):
        """
        Verify syslog message

        :param data: syslog message
        :param facility: facility value
        :param severity: severity level
        :param appname: application name that originate message
        :param msgid: message identifier
        :param sd: structured data (optional)
        :param msg: free-form message (optional)
        """
        message = data.decode("utf-8")
        if sd is None:
            sd = {}
        try:
            message = SyslogMessage.parse(message)
        except ParseError as e:
            self.logger.error(e)
            raise
        else:
            self.assertEqual(message.facility, facility)
            self.assertEqual(message.severity, severity)
            self.assertEqual(message.appname, appname)
            self.assertEqual(message.msgid, msgid)
            self.assertEqual(message.msg, msg)
            self.assertEqual(message.sd, sd)
            self.assertEqual(message.version, 1)
            self.assertEqual(message.hostname, self.pg0.local_ip4)

    def test_syslog(self):
        """Syslog Protocol test"""
        self.vapi.syslog_set_sender(
            src_address=self.pg0.local_ip4, collector_address=self.pg0.remote_ip4
        )
        config = self.vapi.syslog_get_sender()
        self.assertEqual(str(config.collector_address), self.pg0.remote_ip4)
        self.assertEqual(config.collector_port, 514)
        self.assertEqual(str(config.src_address), self.pg0.local_ip4)
        self.assertEqual(config.vrf_id, 0)
        self.assertEqual(config.max_msg_size, 480)

        appname = "test"
        msgid = "testMsg"
        msg = "this is message"
        sd1 = {
            "exampleSDID@32473": {"iut": "3", "eventSource": "App", "eventID": "1011"}
        }
        sd2 = {
            "exampleSDID@32473": {"iut": "3", "eventSource": "App", "eventID": "1011"},
            "examplePriority@32473": {"class": "high"},
        }

        self.pg_enable_capture(self.pg_interfaces)
        self.syslog_generate(
            SyslogFacility.local7, SyslogSeverity.info, appname, msgid, None, msg
        )
        capture = self.pg0.get_capture(1)
        try:
            self.assertEqual(capture[0][IP].src, self.pg0.local_ip4)
            self.assertEqual(capture[0][IP].dst, self.pg0.remote_ip4)
            self.assertEqual(capture[0][UDP].dport, 514)
            self.assert_packet_checksums_valid(capture[0], False)
        except:
            self.logger.error(ppp("invalid packet:", capture[0]))
            raise
        self.syslog_verify(
            capture[0][Raw].load,
            SyslogFacility.local7,
            SyslogSeverity.info,
            appname,
            msgid,
            None,
            msg,
        )

        self.pg_enable_capture(self.pg_interfaces)
        self.vapi.syslog_set_filter(self.SYSLOG_SEVERITY.SYSLOG_API_SEVERITY_WARN)
        filter = self.vapi.syslog_get_filter()
        self.assertEqual(filter.severity, self.SYSLOG_SEVERITY.SYSLOG_API_SEVERITY_WARN)
        self.syslog_generate(
            SyslogFacility.local7, SyslogSeverity.info, appname, msgid, None, msg
        )
        self.pg0.assert_nothing_captured()

        self.pg_enable_capture(self.pg_interfaces)
        self.syslog_generate(
            SyslogFacility.local6, SyslogSeverity.warning, appname, msgid, sd1, msg
        )
        capture = self.pg0.get_capture(1)
        self.syslog_verify(
            capture[0][Raw].load,
            SyslogFacility.local6,
            SyslogSeverity.warning,
            appname,
            msgid,
            sd1,
            msg,
        )

        self.vapi.syslog_set_sender(
            self.pg0.local_ip4, self.pg0.remote_ip4, collector_port=12345
        )
        config = self.vapi.syslog_get_sender()
        self.assertEqual(config.collector_port, 12345)

        self.pg_enable_capture(self.pg_interfaces)
        self.syslog_generate(
            SyslogFacility.local5, SyslogSeverity.err, appname, msgid, sd2, None
        )
        capture = self.pg0.get_capture(1)
        try:
            self.assertEqual(capture[0][UDP].dport, 12345)
        except:
            self.logger.error(ppp("invalid packet:", capture[0]))
            raise
        self.syslog_verify(
            capture[0][Raw].load,
            SyslogFacility.local5,
            SyslogSeverity.err,
            appname,
            msgid,
            sd2,
            None,
        )


if __name__ == "__main__":
    unittest.main(testRunner=VppTestRunner)