"""
    :codeauthor: Pedro Algarvio (pedro@algarvio.me)
    :copyright: Copyright 2016 by the SaltStack Team, see AUTHORS for more details.
    :license: Apache 2.0, see LICENSE for more details.


    pytestsalt.salt.log_handlers.pytest_log_handler
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Salt External Logging Handler
"""


import errno
import logging
import socket
import threading
from multiprocessing import Queue

import salt.log.setup
import salt.utils.msgpack
from salt.utils.platform import is_darwin

log = logging.getLogger(__name__)

__virtualname__ = "runtests_log_handler"


def __virtual__():
    if "runtests_log_port" not in __opts__:
        return False, "'runtests_log_port' not in options"
    return (
        False,
        "runtests external logging handler is temporarily disabled for Python 3 tests",
    )


def setup_handlers():
    port = __opts__["runtests_log_port"]
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    try:
        sock.connect(("localhost", port))
    except OSError as exc:
        if exc.errno == errno.ECONNREFUSED:
            log.warning("Failed to connect to log server")
            return
    finally:
        try:
            sock.shutdown(socket.SHUT_RDWR)
        except OSError:
            pass
        sock.close()

    # One million log messages is more than enough to queue.
    # Above that value, if `process_queue` can't process fast enough,
    # start dropping. This will contain a memory leak in case `process_queue`
    # can't process fast enough of in case it can't deliver the log records at all.
    if is_darwin():
        queue_size = 32767
    else:
        queue_size = 10000000
    queue = Queue(queue_size)
    handler = salt.log.setup.QueueHandler(queue)
    level = salt.log.setup.LOG_LEVELS[
        (__opts__.get("runtests_log_level") or "error").lower()
    ]
    handler.setLevel(level)
    process_queue_thread = threading.Thread(target=process_queue, args=(port, queue))
    process_queue_thread.daemon = True
    process_queue_thread.start()
    return handler


def process_queue(port, queue):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    try:
        sock.connect(("localhost", port))
    except OSError as exc:
        if exc.errno == errno.ECONNREFUSED:
            sock.shutdown(socket.SHUT_RDWR)
            sock.close()
            log.warning("Failed to connect to log server")
            return

    while True:
        try:
            record = queue.get()
            if record is None:
                # A sentinel to stop processing the queue
                break
            # Just log everything, filtering will happen on the main process
            # logging handlers
            sock.sendall(salt.utils.msgpack.dumps(record.__dict__, use_bin_type=True))
        except (OSError, EOFError, KeyboardInterrupt, SystemExit):
            if hasattr(exc, "errno") and exc.errno != errno.EPIPE:
                log.exception(exc)
            try:
                sock.shutdown(socket.SHUT_RDWR)
                sock.close()
            except OSError:
                pass
            break
        except Exception as exc:  # pylint: disable=broad-except
            log.warning(
                "An exception occurred in the pytest salt logging " "queue thread: %s",
                exc,
                exc_info_on_loglevel=logging.DEBUG,
            )