#!/usr/bin/python
#
# Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#

"""
This file contains the procgrep utility which allows users to search process
information.
"""

from mysql.utilities.common.tools import check_python_version

# Check Python version compatibility
check_python_version()

import os.path
import sys

from mysql.utilities.exception import EmptyResultError
from mysql.utilities.command.proc import (ProcessGrep, KILL_CONNECTION,
                                          KILL_QUERY, PRINT_PROCESS, ID, USER,
                                          HOST, DB, COMMAND, INFO, STATE)
from mysql.utilities.common.tools import check_connector_python
from mysql.utilities.common.options import (add_regexp, setup_common_options,
                                            add_verbosity, add_format_option,
                                            add_character_set_option)


def add_pattern(option, opt, value, parser, field):
    """Callback used in optparse for the --match-<pattern> option.
    """
    entry = (field, value)
    try:
        getattr(parser.values, option.dest).append(entry)
    except AttributeError:
        setattr(parser.values, option.dest, [entry])

# Check for connector/python
if not check_connector_python():
    sys.exit(1)

# Setup the command parser and setup server, help
parser = setup_common_options(os.path.basename(sys.argv[0]),
                              "mysqlprocgrep - search process information",
                              "%prog --server=user:pass@host:port:socket "
                              "[options]", True)

# Add character set option
add_character_set_option(parser)

# Add regexp
add_regexp(parser)

parser.add_option(
    "-Q", "--print-sql", "--sql",
    dest="print_sql", action="store_true", default=False,
    help="print the statement instead of sending it to the server. If a kill "
    "option is submitted, a procedure will be generated containing the code "
    "for executing the kill."
)
parser.add_option(
    "--sql-body",
    dest="sql_body", action="store_true", default=False,
    help="only print the body of the procedure."
)
parser.add_option(
    "--kill-connection",
    action="append_const", const=KILL_CONNECTION,
    dest="actions", default=[],
    help="kill all matching connections."
)
parser.add_option(
    "--kill-query",
    action="append_const", const=KILL_QUERY,
    dest="actions", default=[],
    help="kill query for all matching processes."
)
parser.add_option(
    "--print",
    action="append_const", const=PRINT_PROCESS,
    dest="actions", default=[],
    help="print all matching processes."
)

# Output format
add_format_option(parser, "display the output in either grid (default), "
                  "tab, csv, or vertical format", "grid")

# Add verbosity mode
add_verbosity(parser, False)

# Adding the --match-* options
for col in (ID, USER, HOST, DB, COMMAND, INFO, STATE):
    parser.add_option(
        "--match-" + col.lower(),
        action="callback", callback=add_pattern, callback_args=(col,),
        dest="matches", type="string", metavar="PATTERN", default=[],
        help="match the '{0}' column of the PROCESSLIST table.".format(col)
    )

parser.add_option(
    "--age",
    dest="age", default=None,
    help="show only processes that have been in the current state more than "
         "a given time."
)

(options, args) = parser.parse_args()

# Print SQL if only --sql-body is given
if options.sql_body:
    options.print_sql = True

if (options.server is None or len(options.server) == 0) \
        and not options.print_sql:
    parser.error("You need at least one server if you're not using the --sql "
                 "option")
elif options.server is not None and len(options.server) > 0 \
        and options.print_sql:
    parser.error("You should not include servers in the call if you are using "
                 "the --sql option")

# If no option was supplied, we print the processes by default
if len(options.actions) == 0:
    options.actions.append(PRINT_PROCESS)

try:
    command = ProcessGrep(options.matches, options.actions, options.use_regexp,
                          age=options.age)
    if options.print_sql:
        print(command.sql(options.sql_body).strip())
    else:
        command.execute(options.server, format=options.format,
                        charset=options.charset)
except EmptyResultError:
    _, details, _ = sys.exc_info()
    sys.stderr.write("No matches\n")
    sys.exit(1)
except Exception:
    _, details, _ = sys.exc_info()
    sys.stderr.write('ERROR: {0}\n'.format(details))
    sys.exit(2)

sys.exit()
