Monolog.lua

monolog.lua

-- Sample input:
-- {
--     "message": "Reloading user from user provider.",
--     "context": [
--     ],
--     "level": 100,
--     "level_name": "DEBUG",
--     "channel": "security",
--     "datetime": {
--         "date": "2014-05-23 14:19:19",
--         "timezone_type": 3,
--         "timezone": "Europe\/Paris"
--     },
--     "extra": {
--         "url": "\/app_dev.php\/",
--         "ip": "127.0.0.1",
--         "http_method": "GET",
--         "server": "connect.product.localhost",
--         "referrer": null
--     }
-- }

require "cjson"
local dt = require "date_time"
require "string"

local msg_type = read_config("type")
local msg_hostname = read_config("hostname")
local msg_facet = read_config("facet")
local msg_server = read_config("server")

-- You can generate the following list with this PHP script
-- <?php

-- $tzlist = [];
-- foreach (DateTimeZone::listIdentifiers() as $tz) {
--     $tz = new DateTimeZone($tz);
--     $tzlist[$tz->getName()] = $tz->getOffset(new Datetime()) * 1e9;
-- }
-- echo "local tzlist = {\n";
-- foreach ($tzlist as $tz => $offset) {
--     echo "    [\"$tz\"] = $offset,\n";
-- }
-- echo "}\n";
local tzlist = {
    ["Africa/Abidjan"] = 0,
    ["Africa/Accra"] = 0,
    ["Africa/Addis_Ababa"] = 10800000000000,
    ["Africa/Algiers"] = 3600000000000,
    ["Africa/Asmara"] = 10800000000000,
    ["Africa/Bamako"] = 0,
    ["Africa/Bangui"] = 3600000000000,
    ["Africa/Banjul"] = 0,
    ["Africa/Bissau"] = 0,
    ["Africa/Blantyre"] = 7200000000000,
    ["Africa/Brazzaville"] = 3600000000000,
    ["Africa/Bujumbura"] = 7200000000000,
    ["Africa/Cairo"] = 7200000000000,
    ["Africa/Casablanca"] = 3600000000000,
    ["Africa/Ceuta"] = 7200000000000,
    ["Africa/Conakry"] = 0,
    ["Africa/Dakar"] = 0,
    ["Africa/Dar_es_Salaam"] = 10800000000000,
    ["Africa/Djibouti"] = 10800000000000,
    ["Africa/Douala"] = 3600000000000,
    ["Africa/El_Aaiun"] = 0,
    ["Africa/Freetown"] = 0,
    ["Africa/Gaborone"] = 7200000000000,
    ["Africa/Harare"] = 7200000000000,
    ["Africa/Johannesburg"] = 7200000000000,
    ["Africa/Juba"] = 10800000000000,
    ["Africa/Kampala"] = 10800000000000,
    ["Africa/Khartoum"] = 10800000000000,
    ["Africa/Kigali"] = 7200000000000,
    ["Africa/Kinshasa"] = 3600000000000,
    ["Africa/Lagos"] = 3600000000000,
    ["Africa/Libreville"] = 3600000000000,
    ["Africa/Lome"] = 0,
    ["Africa/Luanda"] = 3600000000000,
    ["Africa/Lubumbashi"] = 7200000000000,
    ["Africa/Lusaka"] = 7200000000000,
    ["Africa/Malabo"] = 3600000000000,
    ["Africa/Maputo"] = 7200000000000,
    ["Africa/Maseru"] = 7200000000000,
    ["Africa/Mbabane"] = 7200000000000,
    ["Africa/Mogadishu"] = 10800000000000,
    ["Africa/Monrovia"] = 0,
    ["Africa/Nairobi"] = 10800000000000,
    ["Africa/Ndjamena"] = 3600000000000,
    ["Africa/Niamey"] = 3600000000000,
    ["Africa/Nouakchott"] = 0,
    ["Africa/Ouagadougou"] = 0,
    ["Africa/Porto-Novo"] = 3600000000000,
    ["Africa/Sao_Tome"] = 0,
    ["Africa/Tripoli"] = 7200000000000,
    ["Africa/Tunis"] = 3600000000000,
    ["Africa/Windhoek"] = 7200000000000,
    ["America/Adak"] = -32400000000000,
    ["America/Anchorage"] = -28800000000000,
    ["America/Anguilla"] = -14400000000000,
    ["America/Antigua"] = -14400000000000,
    ["America/Araguaina"] = -10800000000000,
    ["America/Argentina/Buenos_Aires"] = -10800000000000,
    ["America/Argentina/Catamarca"] = -10800000000000,
    ["America/Argentina/Cordoba"] = -10800000000000,
    ["America/Argentina/Jujuy"] = -10800000000000,
    ["America/Argentina/La_Rioja"] = -10800000000000,
    ["America/Argentina/Mendoza"] = -10800000000000,
    ["America/Argentina/Rio_Gallegos"] = -10800000000000,
    ["America/Argentina/Salta"] = -10800000000000,
    ["America/Argentina/San_Juan"] = -10800000000000,
    ["America/Argentina/San_Luis"] = -10800000000000,
    ["America/Argentina/Tucuman"] = -10800000000000,
    ["America/Argentina/Ushuaia"] = -10800000000000,
    ["America/Aruba"] = -14400000000000,
    ["America/Asuncion"] = -10800000000000,
    ["America/Atikokan"] = -18000000000000,
    ["America/Bahia"] = -10800000000000,
    ["America/Bahia_Banderas"] = -18000000000000,
    ["America/Barbados"] = -14400000000000,
    ["America/Belem"] = -10800000000000,
    ["America/Belize"] = -21600000000000,
    ["America/Blanc-Sablon"] = -14400000000000,
    ["America/Boa_Vista"] = -14400000000000,
    ["America/Bogota"] = -18000000000000,
    ["America/Boise"] = -21600000000000,
    ["America/Cambridge_Bay"] = -21600000000000,
    ["America/Campo_Grande"] = -14400000000000,
    ["America/Cancun"] = -18000000000000,
    ["America/Caracas"] = -16200000000000,
    ["America/Cayenne"] = -10800000000000,
    ["America/Cayman"] = -18000000000000,
    ["America/Chicago"] = -18000000000000,
    ["America/Chihuahua"] = -21600000000000,
    ["America/Costa_Rica"] = -21600000000000,
    ["America/Creston"] = -25200000000000,
    ["America/Cuiaba"] = -14400000000000,
    ["America/Curacao"] = -14400000000000,
    ["America/Danmarkshavn"] = 0,
    ["America/Dawson"] = -25200000000000,
    ["America/Dawson_Creek"] = -25200000000000,
    ["America/Denver"] = -21600000000000,
    ["America/Detroit"] = -14400000000000,
    ["America/Dominica"] = -14400000000000,
    ["America/Edmonton"] = -21600000000000,
    ["America/Eirunepe"] = -14400000000000,
    ["America/El_Salvador"] = -21600000000000,
    ["America/Fortaleza"] = -10800000000000,
    ["America/Glace_Bay"] = -10800000000000,
    ["America/Godthab"] = -7200000000000,
    ["America/Goose_Bay"] = -10800000000000,
    ["America/Grand_Turk"] = -14400000000000,
    ["America/Grenada"] = -14400000000000,
    ["America/Guadeloupe"] = -14400000000000,
    ["America/Guatemala"] = -21600000000000,
    ["America/Guayaquil"] = -18000000000000,
    ["America/Guyana"] = -14400000000000,
    ["America/Halifax"] = -10800000000000,
    ["America/Havana"] = -14400000000000,
    ["America/Hermosillo"] = -25200000000000,
    ["America/Indiana/Indianapolis"] = -14400000000000,
    ["America/Indiana/Knox"] = -18000000000000,
    ["America/Indiana/Marengo"] = -14400000000000,
    ["America/Indiana/Petersburg"] = -14400000000000,
    ["America/Indiana/Tell_City"] = -18000000000000,
    ["America/Indiana/Vevay"] = -14400000000000,
    ["America/Indiana/Vincennes"] = -14400000000000,
    ["America/Indiana/Winamac"] = -14400000000000,
    ["America/Inuvik"] = -21600000000000,
    ["America/Iqaluit"] = -14400000000000,
    ["America/Jamaica"] = -18000000000000,
    ["America/Juneau"] = -28800000000000,
    ["America/Kentucky/Louisville"] = -14400000000000,
    ["America/Kentucky/Monticello"] = -14400000000000,
    ["America/Kralendijk"] = -14400000000000,
    ["America/La_Paz"] = -14400000000000,
    ["America/Lima"] = -18000000000000,
    ["America/Los_Angeles"] = -25200000000000,
    ["America/Lower_Princes"] = -14400000000000,
    ["America/Maceio"] = -10800000000000,
    ["America/Managua"] = -21600000000000,
    ["America/Manaus"] = -14400000000000,
    ["America/Marigot"] = -14400000000000,
    ["America/Martinique"] = -14400000000000,
    ["America/Matamoros"] = -18000000000000,
    ["America/Mazatlan"] = -21600000000000,
    ["America/Menominee"] = -18000000000000,
    ["America/Merida"] = -18000000000000,
    ["America/Metlakatla"] = -28800000000000,
    ["America/Mexico_City"] = -18000000000000,
    ["America/Miquelon"] = -7200000000000,
    ["America/Moncton"] = -10800000000000,
    ["America/Monterrey"] = -18000000000000,
    ["America/Montevideo"] = -7200000000000,
    ["America/Montserrat"] = -14400000000000,
    ["America/Nassau"] = -14400000000000,
    ["America/New_York"] = -14400000000000,
    ["America/Nipigon"] = -14400000000000,
    ["America/Nome"] = -28800000000000,
    ["America/Noronha"] = -7200000000000,
    ["America/North_Dakota/Beulah"] = -18000000000000,
    ["America/North_Dakota/Center"] = -18000000000000,
    ["America/North_Dakota/New_Salem"] = -18000000000000,
    ["America/Ojinaga"] = -21600000000000,
    ["America/Panama"] = -18000000000000,
    ["America/Pangnirtung"] = -14400000000000,
    ["America/Paramaribo"] = -10800000000000,
    ["America/Phoenix"] = -25200000000000,
    ["America/Port-au-Prince"] = -14400000000000,
    ["America/Port_of_Spain"] = -14400000000000,
    ["America/Porto_Velho"] = -14400000000000,
    ["America/Puerto_Rico"] = -14400000000000,
    ["America/Rainy_River"] = -18000000000000,
    ["America/Rankin_Inlet"] = -18000000000000,
    ["America/Recife"] = -10800000000000,
    ["America/Regina"] = -21600000000000,
    ["America/Resolute"] = -18000000000000,
    ["America/Rio_Branco"] = -14400000000000,
    ["America/Santa_Isabel"] = -25200000000000,
    ["America/Santarem"] = -10800000000000,
    ["America/Santiago"] = -10800000000000,
    ["America/Santo_Domingo"] = -14400000000000,
    ["America/Sao_Paulo"] = -10800000000000,
    ["America/Scoresbysund"] = 0,
    ["America/Sitka"] = -28800000000000,
    ["America/St_Barthelemy"] = -14400000000000,
    ["America/St_Johns"] = -9000000000000,
    ["America/St_Kitts"] = -14400000000000,
    ["America/St_Lucia"] = -14400000000000,
    ["America/St_Thomas"] = -14400000000000,
    ["America/St_Vincent"] = -14400000000000,
    ["America/Swift_Current"] = -21600000000000,
    ["America/Tegucigalpa"] = -21600000000000,
    ["America/Thule"] = -10800000000000,
    ["America/Thunder_Bay"] = -14400000000000,
    ["America/Tijuana"] = -25200000000000,
    ["America/Toronto"] = -14400000000000,
    ["America/Tortola"] = -14400000000000,
    ["America/Vancouver"] = -25200000000000,
    ["America/Whitehorse"] = -25200000000000,
    ["America/Winnipeg"] = -18000000000000,
    ["America/Yakutat"] = -28800000000000,
    ["America/Yellowknife"] = -21600000000000,
    ["Antarctica/Casey"] = 28800000000000,
    ["Antarctica/Davis"] = 25200000000000,
    ["Antarctica/DumontDUrville"] = 36000000000000,
    ["Antarctica/Macquarie"] = 39600000000000,
    ["Antarctica/Mawson"] = 18000000000000,
    ["Antarctica/McMurdo"] = 46800000000000,
    ["Antarctica/Palmer"] = -10800000000000,
    ["Antarctica/Rothera"] = -10800000000000,
    ["Antarctica/Syowa"] = 10800000000000,
    ["Antarctica/Vostok"] = 21600000000000,
    ["Arctic/Longyearbyen"] = 7200000000000,
    ["Asia/Aden"] = 10800000000000,
    ["Asia/Almaty"] = 21600000000000,
    ["Asia/Amman"] = 10800000000000,
    ["Asia/Anadyr"] = 43200000000000,
    ["Asia/Aqtau"] = 18000000000000,
    ["Asia/Aqtobe"] = 18000000000000,
    ["Asia/Ashgabat"] = 18000000000000,
    ["Asia/Baghdad"] = 10800000000000,
    ["Asia/Bahrain"] = 10800000000000,
    ["Asia/Baku"] = 18000000000000,
    ["Asia/Bangkok"] = 25200000000000,
    ["Asia/Beirut"] = 10800000000000,
    ["Asia/Bishkek"] = 21600000000000,
    ["Asia/Brunei"] = 28800000000000,
    ["Asia/Choibalsan"] = 28800000000000,
    ["Asia/Chongqing"] = 28800000000000,
    ["Asia/Colombo"] = 19800000000000,
    ["Asia/Damascus"] = 10800000000000,
    ["Asia/Dhaka"] = 21600000000000,
    ["Asia/Dili"] = 32400000000000,
    ["Asia/Dubai"] = 14400000000000,
    ["Asia/Dushanbe"] = 18000000000000,
    ["Asia/Gaza"] = 7200000000000,
    ["Asia/Harbin"] = 28800000000000,
    ["Asia/Hebron"] = 7200000000000,
    ["Asia/Ho_Chi_Minh"] = 25200000000000,
    ["Asia/Hong_Kong"] = 28800000000000,
    ["Asia/Hovd"] = 25200000000000,
    ["Asia/Irkutsk"] = 32400000000000,
    ["Asia/Jakarta"] = 25200000000000,
    ["Asia/Jayapura"] = 32400000000000,
    ["Asia/Jerusalem"] = 10800000000000,
    ["Asia/Kabul"] = 16200000000000,
    ["Asia/Kamchatka"] = 43200000000000,
    ["Asia/Karachi"] = 18000000000000,
    ["Asia/Kashgar"] = 28800000000000,
    ["Asia/Kathmandu"] = 20700000000000,
    ["Asia/Khandyga"] = 36000000000000,
    ["Asia/Kolkata"] = 19800000000000,
    ["Asia/Krasnoyarsk"] = 28800000000000,
    ["Asia/Kuala_Lumpur"] = 28800000000000,
    ["Asia/Kuching"] = 28800000000000,
    ["Asia/Kuwait"] = 10800000000000,
    ["Asia/Macau"] = 28800000000000,
    ["Asia/Magadan"] = 43200000000000,
    ["Asia/Makassar"] = 28800000000000,
    ["Asia/Manila"] = 28800000000000,
    ["Asia/Muscat"] = 14400000000000,
    ["Asia/Nicosia"] = 10800000000000,
    ["Asia/Novokuznetsk"] = 25200000000000,
    ["Asia/Novosibirsk"] = 25200000000000,
    ["Asia/Omsk"] = 25200000000000,
    ["Asia/Oral"] = 18000000000000,
    ["Asia/Phnom_Penh"] = 25200000000000,
    ["Asia/Pontianak"] = 25200000000000,
    ["Asia/Pyongyang"] = 32400000000000,
    ["Asia/Qatar"] = 10800000000000,
    ["Asia/Qyzylorda"] = 21600000000000,
    ["Asia/Rangoon"] = 23400000000000,
    ["Asia/Riyadh"] = 10800000000000,
    ["Asia/Sakhalin"] = 39600000000000,
    ["Asia/Samarkand"] = 18000000000000,
    ["Asia/Seoul"] = 32400000000000,
    ["Asia/Shanghai"] = 28800000000000,
    ["Asia/Singapore"] = 28800000000000,
    ["Asia/Taipei"] = 28800000000000,
    ["Asia/Tashkent"] = 18000000000000,
    ["Asia/Tbilisi"] = 14400000000000,
    ["Asia/Tehran"] = 12600000000000,
    ["Asia/Thimphu"] = 21600000000000,
    ["Asia/Tokyo"] = 32400000000000,
    ["Asia/Ulaanbaatar"] = 28800000000000,
    ["Asia/Urumqi"] = 28800000000000,
    ["Asia/Ust-Nera"] = 39600000000000,
    ["Asia/Vientiane"] = 25200000000000,
    ["Asia/Vladivostok"] = 39600000000000,
    ["Asia/Yakutsk"] = 36000000000000,
    ["Asia/Yekaterinburg"] = 21600000000000,
    ["Asia/Yerevan"] = 14400000000000,
    ["Atlantic/Azores"] = 0,
    ["Atlantic/Bermuda"] = -10800000000000,
    ["Atlantic/Canary"] = 3600000000000,
    ["Atlantic/Cape_Verde"] = -3600000000000,
    ["Atlantic/Faroe"] = 3600000000000,
    ["Atlantic/Madeira"] = 3600000000000,
    ["Atlantic/Reykjavik"] = 0,
    ["Atlantic/South_Georgia"] = -7200000000000,
    ["Atlantic/St_Helena"] = 0,
    ["Atlantic/Stanley"] = -10800000000000,
    ["Australia/Adelaide"] = 37800000000000,
    ["Australia/Brisbane"] = 36000000000000,
    ["Australia/Broken_Hill"] = 37800000000000,
    ["Australia/Currie"] = 39600000000000,
    ["Australia/Darwin"] = 34200000000000,
    ["Australia/Eucla"] = 31500000000000,
    ["Australia/Hobart"] = 39600000000000,
    ["Australia/Lindeman"] = 36000000000000,
    ["Australia/Lord_Howe"] = 39600000000000,
    ["Australia/Melbourne"] = 39600000000000,
    ["Australia/Perth"] = 28800000000000,
    ["Australia/Sydney"] = 39600000000000,
    ["Europe/Amsterdam"] = 7200000000000,
    ["Europe/Andorra"] = 7200000000000,
    ["Europe/Athens"] = 10800000000000,
    ["Europe/Belgrade"] = 7200000000000,
    ["Europe/Berlin"] = 7200000000000,
    ["Europe/Bratislava"] = 7200000000000,
    ["Europe/Brussels"] = 7200000000000,
    ["Europe/Bucharest"] = 10800000000000,
    ["Europe/Budapest"] = 7200000000000,
    ["Europe/Busingen"] = 7200000000000,
    ["Europe/Chisinau"] = 10800000000000,
    ["Europe/Copenhagen"] = 7200000000000,
    ["Europe/Dublin"] = 3600000000000,
    ["Europe/Gibraltar"] = 7200000000000,
    ["Europe/Guernsey"] = 3600000000000,
    ["Europe/Helsinki"] = 10800000000000,
    ["Europe/Isle_of_Man"] = 3600000000000,
    ["Europe/Istanbul"] = 10800000000000,
    ["Europe/Jersey"] = 3600000000000,
    ["Europe/Kaliningrad"] = 10800000000000,
    ["Europe/Kiev"] = 10800000000000,
    ["Europe/Lisbon"] = 3600000000000,
    ["Europe/Ljubljana"] = 7200000000000,
    ["Europe/London"] = 3600000000000,
    ["Europe/Luxembourg"] = 7200000000000,
    ["Europe/Madrid"] = 7200000000000,
    ["Europe/Malta"] = 7200000000000,
    ["Europe/Mariehamn"] = 10800000000000,
    ["Europe/Minsk"] = 10800000000000,
    ["Europe/Monaco"] = 7200000000000,
    ["Europe/Moscow"] = 14400000000000,
    ["Europe/Oslo"] = 7200000000000,
    ["Europe/Paris"] = 7200000000000,
    ["Europe/Podgorica"] = 7200000000000,
    ["Europe/Prague"] = 7200000000000,
    ["Europe/Riga"] = 10800000000000,
    ["Europe/Rome"] = 7200000000000,
    ["Europe/Samara"] = 14400000000000,
    ["Europe/San_Marino"] = 7200000000000,
    ["Europe/Sarajevo"] = 7200000000000,
    ["Europe/Simferopol"] = 10800000000000,
    ["Europe/Skopje"] = 7200000000000,
    ["Europe/Sofia"] = 10800000000000,
    ["Europe/Stockholm"] = 7200000000000,
    ["Europe/Tallinn"] = 10800000000000,
    ["Europe/Tirane"] = 7200000000000,
    ["Europe/Uzhgorod"] = 10800000000000,
    ["Europe/Vaduz"] = 7200000000000,
    ["Europe/Vatican"] = 7200000000000,
    ["Europe/Vienna"] = 7200000000000,
    ["Europe/Vilnius"] = 10800000000000,
    ["Europe/Volgograd"] = 14400000000000,
    ["Europe/Warsaw"] = 7200000000000,
    ["Europe/Zagreb"] = 7200000000000,
    ["Europe/Zaporozhye"] = 10800000000000,
    ["Europe/Zurich"] = 7200000000000,
    ["Indian/Antananarivo"] = 10800000000000,
    ["Indian/Chagos"] = 21600000000000,
    ["Indian/Christmas"] = 25200000000000,
    ["Indian/Cocos"] = 23400000000000,
    ["Indian/Comoro"] = 10800000000000,
    ["Indian/Kerguelen"] = 18000000000000,
    ["Indian/Mahe"] = 14400000000000,
    ["Indian/Maldives"] = 18000000000000,
    ["Indian/Mauritius"] = 14400000000000,
    ["Indian/Mayotte"] = 10800000000000,
    ["Indian/Reunion"] = 14400000000000,
    ["Pacific/Apia"] = 50400000000000,
    ["Pacific/Auckland"] = 46800000000000,
    ["Pacific/Chatham"] = 49500000000000,
    ["Pacific/Chuuk"] = 36000000000000,
    ["Pacific/Easter"] = -18000000000000,
    ["Pacific/Efate"] = 39600000000000,
    ["Pacific/Enderbury"] = 46800000000000,
    ["Pacific/Fakaofo"] = 46800000000000,
    ["Pacific/Fiji"] = 43200000000000,
    ["Pacific/Funafuti"] = 43200000000000,
    ["Pacific/Galapagos"] = -21600000000000,
    ["Pacific/Gambier"] = -32400000000000,
    ["Pacific/Guadalcanal"] = 39600000000000,
    ["Pacific/Guam"] = 36000000000000,
    ["Pacific/Honolulu"] = -36000000000000,
    ["Pacific/Johnston"] = -36000000000000,
    ["Pacific/Kiritimati"] = 50400000000000,
    ["Pacific/Kosrae"] = 39600000000000,
    ["Pacific/Kwajalein"] = 43200000000000,
    ["Pacific/Majuro"] = 43200000000000,
    ["Pacific/Marquesas"] = -34200000000000,
    ["Pacific/Midway"] = -39600000000000,
    ["Pacific/Nauru"] = 43200000000000,
    ["Pacific/Niue"] = -39600000000000,
    ["Pacific/Norfolk"] = 41400000000000,
    ["Pacific/Noumea"] = 39600000000000,
    ["Pacific/Pago_Pago"] = -39600000000000,
    ["Pacific/Palau"] = 32400000000000,
    ["Pacific/Pitcairn"] = -28800000000000,
    ["Pacific/Pohnpei"] = 39600000000000,
    ["Pacific/Port_Moresby"] = 36000000000000,
    ["Pacific/Rarotonga"] = -36000000000000,
    ["Pacific/Saipan"] = 36000000000000,
    ["Pacific/Tahiti"] = -36000000000000,
    ["Pacific/Tarawa"] = 43200000000000,
    ["Pacific/Tongatapu"] = 46800000000000,
    ["Pacific/Wake"] = 43200000000000,
    ["Pacific/Wallis"] = 43200000000000,
    ["UTC"] = 0,
}
local grammar = dt.build_strftime_grammar("%Y-%m-%d %H:%M:%S")
local severity_map = {
    DEBUG = 7,
    INFO = 6,
    NOTICE = 5,
    WARNING = 4,
    ERROR = 3,
    CRITICAL = 2,
    ALERT = 1,
    EMERGENCY = 0
}

local msg = {
    Fields = {
        Context = nil,
        Extra = nil,
        LogUuid = nil,
        Facet = msg_facet,
        Server = msg_server
    },
    Hostname = msg_hostname,
    Payload = nil,
    Timestamp = nil,
    Type = msg_type
}

function process_message()
    local payload = read_message("Payload");

    local ok, json = pcall(cjson.decode, payload)
    if not ok then return -1 end

    msg.Severity = severity_map[json.level_name]
    msg.Logger = json.channel
    msg.Payload = json.message
    msg.Fields.SeverityText = json.level_name
    msg.Fields.Context = cjson.encode(json.context)
    if json.extra.uuid then
        msg.Fields.LogUuid = json.extra.uuid
        json.extra.uuid = nil
    end
    msg.Fields.Extra = cjson.encode(json.extra)

    local d = grammar:match(json.datetime.date)
    if d then
        local timestamp = dt.time_to_ns(d)
        if tzlist[json.datetime.timezone] then
            timestamp = timestamp - tzlist[json.datetime.timezone]
        end
        msg.Timestamp = timestamp
    else
        error('unable to decode datetime')
    end

    local ok = pcall(inject_message, msg)
    if not ok then return -1 end

    return 0
end