-- Copyright 2015-2016 Mirantis, Inc.
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
require "string"
local l      = require 'lpeg'
l.locale(l)

local patt   = require 'os_patterns'
local utils  = require 'os_utils'

local msg = {
    Timestamp   = nil,
    Type        = 'log',
    Hostname    = nil,
    Payload     = nil,
    Pid         = nil,
    Fields      = {},
    Severity    = nil,
}

local sp    = patt.sp
local colon = patt.colon

-- mysqld logs are cranky,the date is YYMMMDD, the hours have no leading zero and the "real" severity level is enclosed by square brackets...
local mysql_grammar = l.Ct(l.digit^-6 * sp^1 *  l.digit^-2 * colon * l.digit^-2 * colon * l.digit^-2 * sp^1 * l.P"[" * l.Cg(l.R("az", "AZ")^0 / string.upper, "SeverityLabel") * l.P"]" * sp^1 * l.Cg(patt.Message, "Message"))


function process_message ()
    local log = read_message("Payload")
    local logger = read_message("Logger")

    local m = mysql_grammar:match(log)
    if not m then return -1 end

    msg.Logger = logger
    msg.Payload = m.Message
    msg.Fields.severity_label = m.SeverityLabel

    return utils.safe_inject_message(msg)
end

Add Heka log decoder for MariaDB
Add Heka log decoder for MariaDB

In the future the Heka Lua sandboxes will be moved out of Kolla, and
installed in the Heka container using a deb or rpm package.

Partially implements: blueprint heka
Change-Id: Iad1e5177d239410a88546fc4ed8c23b9e46beef3
