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‎LICENSE

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Apache License
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‎README.md

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# ngx_lua_datadog
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# Ngx Lua Datadog connecter
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Simple libary extracted from the [Kong](https://github.com/Mashape/kong) project that allows for Datadog(statsd) collection from inside lua scripts running in nginx
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## Usage
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Include the library code in your nginx configuration, usually inside the http block but outside the server block
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```
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# set path for lua libraries - ;; means append existing paths
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lua_package_path "/path/to/ngx_lua_datadog/lib/?.lua;;";
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```
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use in a location stanza:
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```
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local conf = { host = "127.0.0.1", port = 8125, prefix = "Lua_Stats_App"}
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local statsd_logger = require "ngx_lua_statsd"
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local logger, err = statsd_logger:new(conf)
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if err then
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ngx_log(ngx.ERR, "failed to create Statsd logger: ", err)
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end
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if ( my_condition ) then
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logger:counter("condition_matched", 1, 1)
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ngx.exit(204)
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else
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logger:counter("condition_not_matched", 1, 1)
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ngx.exit(200)
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end
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```
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## Configuration options
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| name | value |
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-------|--------
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| host | the ip or name of your statsd server |
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| port | the port number your statsd server runs on, default is 8125 |
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| prefix | the string that all stat messages will be prefixed with |
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## Statistic Gathering
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```
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-- Simple counter
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counter(stat, value, sample_rate)
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-- Gauge
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gauge(stat, value, sample_rate)
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-- Timer
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timer(stat, ms)
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-- Histogram
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histogram(stat, value)
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-- Meter
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meter(stat, value)
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-- Sets
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meter(stat, value)
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```
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Sample rates are your responsiblity to calculate. If you tell it the sample rate is 0.10 (10 percent), then the **value** you send needs to be the sampled value. e.g. If you've had 100 hits and you send a 0.20 sample rate, the value you send would be 20
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‎lib/ngx_lua_datadog.lua

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local ngx_socket_udp = ngx.socket.udp
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local ngx_log = ngx.log
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local table_concat = table.concat
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local setmetatable = setmetatable
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local NGX_ERR = ngx.ERR
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local statsd_mt = {}
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statsd_mt.__index = statsd_mt
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function statsd_mt:new(conf)
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local sock = ngx_socket_udp()
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sock:settimeout(conf.timeout)
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local _, err = sock:setpeername(conf.host, conf.port)
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if err then
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return nil, "failed to connect to "..conf.host..":"..tostring(conf.port)..": "..err
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end
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local statsd = {
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host = conf.host,
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port = conf.port,
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socket = sock,
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prefix = conf.prefix
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}
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return setmetatable(statsd, statsd_mt)
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end
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function statsd_mt:create_statsd_message(stat, delta, kind, sample_rate)
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local rate = ""
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if sample_rate and sample_rate ~= 1 then
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rate = "|@"..sample_rate
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end
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local message = {
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self.prefix..".",
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stat,
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":",
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delta,
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"|",
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kind,
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rate
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}
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return table_concat(message, "")
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end
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function statsd_mt:close_socket()
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local ok, err = self.socket:close()
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if not ok then
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ngx_log(NGX_ERR, "failed to close connection from "..self.host..":"..tostring(self.port)..": ", err)
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return
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end
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end
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function statsd_mt:send_statsd(stat, delta, kind, sample_rate)
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local udp_message = self:create_statsd_message(stat, delta, kind, sample_rate)
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local ok, err = self.socket:send(udp_message)
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if not ok then
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ngx_log(NGX_ERR, "failed to send data to "..self.host..":"..tostring(self.port)..": ", err)
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end
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end
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function statsd_mt:gauge(stat, value, sample_rate)
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return self:send_statsd(stat, value, "g", sample_rate)
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end
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function statsd_mt:counter(stat, value, sample_rate)
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return self:send_statsd(stat, value, "c", sample_rate)
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end
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function statsd_mt:timer(stat, ms)
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return self:send_statsd(stat, ms, "ms")
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end
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function statsd_mt:histogram(stat, value)
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return self:send_statsd(stat, value, "h")
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end
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function statsd_mt:meter(stat, value)
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return self:send_statsd(stat, value, "m")
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end
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function statsd_mt:set(stat, value)
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return self:send_statsd(stat, value, "s")
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end
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return statsd_mt

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