/
common_log_format.lua
484 lines (417 loc) · 16.5 KB
/
common_log_format.lua
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-- This Source Code Form is subject to the terms of the Mozilla Public
-- License, v. 2.0. If a copy of the MPL was not distributed with this
-- file, You can obtain one at http://mozilla.org/MPL/2.0/.
--[[
# Common Log Format Module
## Variables
* `nginx_error_grammar` - LPEG grammar to parse an Nginx error log line
## Functions
### build_nginx_grammar
Constructs an LPEG grammar based on the Nginx log_format configuration string.
*Arguments*
- log_format (string) - Nginx log_format configuration string
*Return*
- grammar (LPEG user data object) or an error is thrown
### build_apache_grammar
Constructs an LPEG grammar based on the Apache log_format configuration string.
*Arguments*
- log_format (string) - Apache log_format configuration string
*Return*
- grammar (LPEG user data object) or an error is thrown
### normalize_user_agent
Extracts the browser, version and os information from a user agent string.
*Arguments*
- ua (string) - user agent string
*Return*
- browser (string)
- version (number)
- os (string)
--]]
-- Imports
local l = require "lpeg"
l.locale(l)
local string = require "string"
local dt = require "lpeg.date_time"
local ip = require "lpeg.ip_address"
local tonumber = tonumber
local ipairs = ipairs
local pairs = pairs
local error = error
local type = type
local M = {}
setfenv(1, M) -- Remove external access to contain everything in the module
--[[ Nginx access log grammar generation and parsing --]]
local pct_encoded = l.P"%" * l.xdigit * l.xdigit
local unreserved = l.alnum + l.S"-._~"
local sub_delims = l.S"!$&'()*+,;="
local last_literal = l.space
local integer = l.P"-"^-1 * l.digit^1 / tonumber
local double = l.digit^1 * "." * l.digit^1 / tonumber
local msec_time = double / dt.seconds_to_ns
local host = l.Ct(l.Cg(ip.v4, "value") * l.Cg(l.Cc"ipv4", "representation"))
+ l.Ct(l.Cg(ip.v6, "value") * l.Cg(l.Cc"ipv6", "representation"))
+ l.Ct(l.Cg((unreserved + pct_encoded + sub_delims)^1, "value") * l.Cg(l.Cc"hostname", "representation"))
local http_status = l.digit * l.digit * l.digit / tonumber
local nginx_error_levels = l.Cg((
l.P"debug" / "7"
+ l.P"info" / "6"
+ l.P"notice" / "5"
+ l.P"warn" / "4"
+ l.P"error" / "3"
+ l.P"crit" / "2"
+ l.P"alert" / "1"
+ l.P"emerg" / "0")
/ tonumber, "severity")
local nginx_upstream_sep = ", "
local nginx_upstream_gsep = " : "
local nginx_upstream_addr = l.C((1 - l.S(nginx_upstream_sep))^1)
local nginx_upstream_addrs = nginx_upstream_addr * (nginx_upstream_sep * nginx_upstream_addr)^0
local nginx_upstream_time = double + l.P"-" / function () return 0 end
local nginx_upstream_times = nginx_upstream_time * (nginx_upstream_sep * nginx_upstream_time)^0
local nginx_upstream_lengths = integer * (nginx_upstream_sep * integer)^0
local nginx_upstream_status = http_status + l.P"-" / function () return 0 end
local nginx_upstream_statuses = nginx_upstream_status * (nginx_upstream_sep * nginx_upstream_status)^0
local nginx_format_variables = {
--arg_*
--args
binary_remote_addr = l.P(1) * l.P(1) * l.P(1) * l.P(1)
, body_bytes_sent = l.Ct(l.Cg(integer, "value") * l.Cg(l.Cc"B", "representation"))
, bytes_sent = l.Ct(l.Cg(integer, "value") * l.Cg(l.Cc"B", "representation"))
, connection = integer
, connection_requests = integer
, content_length = l.Ct(l.Cg(integer, "value") * l.Cg(l.Cc"B", "representation"))
--content_type
--cookie_*
--document_root
--document_uri
, host = host
, hostname = host
--http_*
, https = l.P"on"^-1
, is_args = l.P"?"^-1
--limit_rate
, msec = msec_time
, nginx_version = l.digit^1 * "." * l.digit^1 * "." * l.digit^1
, pid = integer
, pipe = l.P"p" + "."
, proxy_protocol_addr = host
--query_string
--realpath_root
, remote_addr = host
, remote_port = integer
--remote_user
--request
--request_body
--request_body_file
, request_completion = l.P"OK"^-1
--request_filename
, request_length = l.Ct(l.Cg(integer, "value") * l.Cg(l.Cc"B", "representation"))
, request_method = (l.alnum + l.S"!#$%&'*+-.^_`|~")^1
, request_time = l.Ct(l.Cg(double, "value") * l.Cg(l.Cc"s", "representation"))
--request_uri
, scheme = l.P"https" + "http"
--sent_http_*
, server_addr = host
, server_name = host
, server_port = integer
, server_protocol = l.P"HTTP/" * l.digit^1 * "." * l.digit^1
, status = http_status
, tcpinfo_rtt = integer
, tcpinfo_rttvar = integer
, tcpinfo_snd_cwnd = integer
, tcpinfo_rcv_space = integer
, time_iso8601 = dt.rfc3339 / dt.time_to_ns
, time_local = dt.clf_timestamp / dt.time_to_ns
--uri
-- Upstream Module Grammars
-- http://nginx.org/en/docs/http/ngx_http_upstream_module.html#variables
, upstream_addr = l.Ct(nginx_upstream_addrs * (nginx_upstream_gsep * nginx_upstream_addrs)^0) + "-"
, upstream_cache_status = l.P"HIT" + "MISS" + "EXPIRED" + "BYPASS" + "STALE" + "UPDATING" + "REVALIDATED" + "-"
, upstream_cache_last_modified = dt.build_strftime_grammar("%a, %d %b %Y %T GMT") / dt.time_to_ns + "-"
, upstream_response_length = l.Ct(l.Cg(l.Ct(nginx_upstream_lengths * (nginx_upstream_gsep * nginx_upstream_lengths)^0), "value") * l.Cg(l.Cc"B", "representation")) + "-"
, upstream_response_time = l.Ct(l.Cg(l.Ct(nginx_upstream_times * (nginx_upstream_gsep * nginx_upstream_times)^0), "value") * l.Cg(l.Cc"s", "representation"))
, upstream_status = l.Ct(nginx_upstream_statuses * (nginx_upstream_gsep * nginx_upstream_statuses)^0)
--upstream_http_* handled by the generic grammar
}
local function get_string_grammar(s)
if last_literal ~= '"' then
return l.Cg((l.P(1) - last_literal)^0, s)
else
return l.Cg((l.P'\\"' + (l.P(1) - l.P'"'))^0, s)
end
end
local function nginx_lookup_grammar(var)
local g = nginx_format_variables[var]
if not g then
g = get_string_grammar(var)
elseif var == "time_local" or var == "time_iso8601" or var == "msec" then
g = l.Cg(g, "time")
else
g = l.Cg(g, var)
end
return g
end
local apache_format_variables = {
["%"] = l.P"%"
, a = l.Cg(host, "remote_addr")
, A = l.Cg(host, "server_addr")
, B = l.Cg(nginx_format_variables["body_bytes_sent"], "body_bytes_sent")
, b = l.Cg(l.Ct(l.Cg(integer + l.P"-" / function () return 0 end, "value") * l.Cg(l.Cc"B", "representation")), "body_bytes_sent")
, D = l.Cg(l.Ct(l.Cg(integer, "value") * l.Cg(l.Cc"us", "representation")), "request_time")
, f = "request_filename"
, h = l.Cg(host, "remote_addr")
, H = l.Cg(nginx_format_variables["server_protocol"], "server_protocol")
, k = l.Cg(integer, "connection_requests")
, l = "remote_user"
, L = "request_log_id"
, m = l.Cg(nginx_format_variables["request_method"], "request_method")
, p = l.Cg(integer, "server_port")
, P = l.Cg(integer, "pid")
, q = "query_string"
, r = "request"
, R = "request_handler"
, s = l.Cg(nginx_format_variables["status"], "status")
, t = l.P"[" * l.Cg(nginx_format_variables["time_local"], "time") * "]"
, T = l.Cg(l.Ct(l.Cg(integer, "value") * l.Cg(l.Cc"s", "representation")), "request_time")
, u = "remote_user"
, U = "uri"
, v = l.Cg(host, "server_name")
, V = l.Cg(host, "server_name")
, X = l.Cg(l.S"X+-", "connection_status")
, I = l.Cg(nginx_format_variables["request_length"], "request_length")
, O = l.Cg(nginx_format_variables["request_length"], "response_length")
, S = l.Cg(nginx_format_variables["request_length"], "total_length")
}
local function port_format(a)
if a == "canonical" or a == "local" then
return l.Cg(integer, "server_port")
elseif a == "remote" then
return l.Cg(integer, "remote_port")
end
error("unknown port format: " .. a)
end
local function pid_format(a)
if a == "pid" then
return l.Cg(integer, "pid")
elseif a == "tid" then
return l.Cg(integer, "tid")
elseif a == "hextid" then
return l.Cg(l.xdigit^1 / function (n) return tonumber(n, 16) end, "tid")
end
error("unknown pid format: " .. a)
end
local function time_format(a)
local pos = 1
if string.find(a, "^end:") then
pos = 5
elseif string.find(a, "^begin:") then
pos = 7
end
if string.find(a, "^sec", pos) then
return l.Cg(l.digit^1 / dt.seconds_to_ns, "time")
elseif string.find(a, "^msec_frac", pos) or string.find(a, "^usec_frac", pos) then
return l.Cg(l.digit^1 / function (t) return tonumber("." .. t) end, "sec_frac")
elseif string.find(a, "^msec", pos) then
return l.Cg(l.digit^1 / function (t) return tonumber(t) * 1e6 end, "time")
elseif string.find(a, "^usec", pos) then
return l.Cg(l.digit^1 / function (t) return tonumber(t) * 1e3 end, "time")
end
return l.Cg(dt.build_strftime_grammar(a) / dt.time_to_ns, "time")
end
local apache_format_arguments = {
a = function(a) return apache_format_variables["a"] end
, C = function(a) return "cookie_" .. a end
, e = function(a) return "env_" .. a end
, i = function(a) return "http_" .. string.gsub(string.lower(a), "-", "_") end -- make it compatible with the Nginx naming convention
, n = function(a) return "module_" .. a end
, o = function(a) return "sent_http_" .. string.gsub(string.lower(a), "-", "_") end -- make it compatible with the Nginx naming convention
, p = port_format
, P = pid_format
, t = time_format
, x = function(a) return string.gsub(string.lower(a), "-", "_") end -- already prefixed by SSL_
}
local function apache_lookup_variable(var)
local g = apache_format_variables[var]
if not g then
error("unknown variable: " .. var)
elseif type(g) == "string" then
g = get_string_grammar(g)
end
return g
end
local function apache_lookup_argument(t)
local f = apache_format_arguments[t.variable]
if not f then
error("unknown variable: " .. t.variable)
end
local g = f(t.argument)
if not g then
error(string.format("variable: %s invalid arguments: %s", t.variable, t.arguments))
elseif type(g) == "string" then
g = get_string_grammar(g)
end
return g
end
local function space_grammar()
last_literal = l.space
return l.space^1
end
local function literal_grammar(var)
last_literal = string.sub(var, -1)
return l.P(var)
end
local escape_chars = {t = "\9", n = "\10", ['"'] = '"', ["\\"] = "\\"}
local function substitute_escape(seq)
seq = string.sub(seq, 2)
local e = escape_chars[seq]
if not e then
e = string.char(tonumber(seq))
end
return e
end
local escape_sequence = l.Cs(((l.P"\\" * (l.S'tn"\\' + l.digit^-3)) / substitute_escape + 1)^0)
local function escape_literal_grammar(var)
local literal = l.match(escape_sequence, var)
last_literal = string.sub(literal, -1)
return l.P(literal)
end
--[[ User Agent normalization
Derived from the Persona user agent parser
https://github.com/mozilla/persona/blob/dev/lib/coarse_user_agent_parser.js
]]--
-- find the version of the last product in the user agent string
local function ua_basic(ua)
local cur, last = 0, nil
while cur do
cur = ua:find("/", cur+1)
if cur then
last = cur
end
end
if last then
return tonumber(ua:match("^(%d+)", last+1))
end
end
-- find the version of the product identified by the keyword
local function ua_keyword(kw)
return function(ua)
local i = ua:find(kw, 1, true)
if i then
local s = i + kw:len()
if s then
return tonumber(ua:match("^(%d+)", s))
end
end
end
end
local ua_os_matchers = {
-- search, replace
{"iPod" ,"iPod" }
, {"iPad" ,"iPad" }
, {"iPhone" ,"iPhone" }
, {"Android" ,"Android" }
, {"BlackBerry" ,"BlackBerry" }
, {"Linux" ,"Linux" }
, {"Macintosh" ,"Macintosh" }
, {"Mozilla/5.0 (Mobile;" ,"FirefoxOS" }
--http://en.wikipedia.org/wiki/Microsoft_Windows#Timeline_of_releases
, {"Windows NT 10.0" ,"Windows 10" }
, {"Windows NT 6.3" ,"Windows 8.1" }
, {"Windows NT 6.2" ,"Windows 8" }
, {"Windows NT 6.1" ,"Windows 7" }
, {"Windows NT 6.0" ,"Windows Vista"}
, {"Windows NT 5.1" ,"Windows XP" }
, {"Windows NT 5.0" ,"Windows 2000" }
}
local fx_sync_android = ua_keyword("Firefox AndroidSync ")
local fx_sync_ios = ua_keyword("Firefox-iOS-Sync/")
local ua_browser_matchers = {
{"Edge" , ua_keyword("Edge/")}
, {"Chrome" , ua_keyword("Chrome/")}
, {"Opera Mini" , ua_basic}
, {"Opera Mobi" , ua_basic}
, {"Opera" , ua_basic}
, {"MSIE" , ua_keyword("MSIE ")}
, {"Trident/7.0" , function() return 11, "MSIE" end}
, {"Safari" , ua_basic}
, {"Firefox AndroidSync" , function(ua) return fx_sync_android(ua), "FxSync", "Android" end}
, {"Firefox-iOS-Sync" , function(ua) return fx_sync_ios(ua), "FxSync", "iOS" end}
, {"Firefox" , ua_keyword("Firefox/")}
}
--[[ Public Interface --]]
-- Returns an LPeg grammar based on the Nginx log_format configuration string.
function build_nginx_grammar(log_format)
last_literal = l.space
local ws = l.space^1 / space_grammar
local variable = l.P"$" * ((l.alnum + "_")^1 / nginx_lookup_grammar)
local literal = (l.P(1) - (ws + variable))^1 / literal_grammar
local item = ws + variable + literal
local p = l.Ct(item * (item)^0)
local t = p:match(log_format)
if not t then
error("could not parse the log_format configuration")
end
local grammar = nil
for i,v in ipairs(t) do
if not grammar then
grammar = v
else
grammar = grammar * v
end
end
return l.Ct(grammar)
end
-- Returns the user agent browser, version, and os
function normalize_user_agent(ua)
if not ua then return end
local browser, version, os
for i, v in ipairs(ua_os_matchers) do
if ua:find(v[1], 1, true) then
os = v[2]
break
end
end
for i, v in ipairs(ua_browser_matchers) do
if ua:find(v[1], 1, true) then
version, browser, aos = v[2](ua)
if not browser then browser = v[1] end
if aos then os = aos end
break
end
end
return browser, version, os
end
-- Returns an LPeg grammar based on the Apache LogFormat configuration string.
function build_apache_grammar(log_format)
last_literal = l.space
local ws = l.space^1 / space_grammar
local http_status_code = l.digit * l.digit * l.digit
local http_status_codes = l.P"!"^-1 * http_status_code * ("," * http_status_code)^0
local variable = l.alpha + "%"
local argument = "{" * l.Cg((l.P(1) - "}")^1, "argument") * "}"
local directive = l.P"%" * l.S"<>"^-1 * (variable / apache_lookup_variable)
+ "%" * http_status_codes^-1 * l.Ct(argument * l.Cg(variable, "variable")) / apache_lookup_argument
local literal = (l.P(1) - (ws + directive))^1 / escape_literal_grammar
local item = ws + directive + literal
local p = l.Ct(item * (item)^0)
local t = p:match(log_format)
if not t then
error("could not parse the log_format configuration")
end
local grammar = nil
for i,v in ipairs(t) do
if not grammar then
grammar = v
else
grammar = grammar * v
end
end
return l.Ct(grammar)
end
nginx_error_grammar = l.Ct(l.Cg(dt.build_strftime_grammar("%Y/%m/%d %T") / dt.time_to_ns, "time")
* l.space * "[" * nginx_error_levels * "]"
* l.space * l.Cg(l.digit^1 / tonumber, "pid") * "#"
* l.Cg(l.digit^1 / tonumber, "tid") * ": "
* (l.P"*" * l.Cg(l.digit^1 / tonumber, "connection") * " ")^-1
* l.Cg(l.P(1)^0, "msg"))
return M