Name

lua-resty-influx - lua influx metrics module for OpenResty/LuaJIT

Status

This library is considered production ready.

Build status:

Description

This library requires an nginx build with ngx_lua module, and LuaJIT 2.0.

Synopsis

    # nginx.conf:

    lua_package_path "/path/to/lua-resty-influx/lib/?.lua;;";
    lua_shared_dict metrics  1m;

    init_worker_by_lua_block {
        local resty_reporter = require "resty.influx.db.reporter"
        local reporter = resty_reporter.new("http://127.0.0.1:12354", "user", "pass", "nginx", {
            tags = {
                host = "127.0.0.1"
            },
            async = true -- auto flush reported data to influx
        })
        local resty_registry = require "resty.influx.registry"
        _G.registry = resty_registry.new{reporter}

        local func_reporter
        func_reporter = function(registry)
            registry:report()
        
            local ok, err = ngx.timer.at(10, func_reporter, registry)
            if not ok then
                error(err)
            end
        end

        local ok, err = ngx.timer.at(10, func_reporter, _G.registry)
        if not ok then
            error(err)
        end
    }

    server {
        location = /t {
            content_by_lua_block {
                local registry = _G.registry
                local measurement = registry:measurement("request", {tag_key = tag_val})
                local context = measurement:timer("rt"):time()

                pcall(function() 
                    for i = 1, 3 do
                        measurement:counter("tps"):mark(i)
                        measurement:averager("size"):update(i)
                        measurement:histogram("value"):update(i)
                    end
                    ngx.sleep(0.01)
                    ngx.update_time()
                end)

                context:stop()

                -- do report
                registry:report()
            }
        }
    }
    

Methods

To load this library,

1. you need to specify this library's path in ngx_lua's lua_package_path directive. For example, lua_package_path "/path/to/lua-resty-influx/lib/?.lua;;";.
2. you use require to load the library into a local Lua variable:

    local resty_registry = require "resty.influx.registry"

new

syntax: registry = resty_registry.new(reporters)

Creates a new registry object instance.

-- creates a registry object
local resty_registry = require "resty.influx.registry"
local registry = resty_registry.new()

Report metrics to the influxdb.

local resty_reporter = require "resty.influx.db.reporter"
local reporter = resty_reporter.new("http://127.0.0.1:12354", "user", "pass", "nginx")

local resty_registry = require "resty.influx.registry"
local registry = resty_registry.new{ reporter }

measurement

syntax: measurement = registry:measurement(key, {tag1= value1, tag2= value2, ... })

Creates a measurement object instance.

local measurement = registry:measurement("request")

report

syntax: registry:report()

Report measurement to the reporters.

Author

Jianhao Dai (toruneko) toruneko@outlook.com

Copyright and License

This module is licensed under the MIT license.

Copyright (C) 2018, by Jianhao Dai (toruneko) toruneko@outlook.com

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

See Also

• the ngx_lua module: https://github.com/openresty/lua-nginx-module