| -- |
| -- Licensed to the Apache Software Foundation (ASF) under one or more |
| -- contributor license agreements. See the NOTICE file distributed with |
| -- this work for additional information regarding copyright ownership. |
| -- The ASF licenses this file to You 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. |
| -- |
| local core = require("apisix.core") |
| local log_util = require("apisix.utils.log-util") |
| local batch_processor = require("apisix.utils.batch-processor") |
| local plugin_name = "udp-logger" |
| local tostring = tostring |
| local buffers = {} |
| local ngx = ngx |
| local udp = ngx.socket.udp |
| local ipairs = ipairs |
| local stale_timer_running = false; |
| local timer_at = ngx.timer.at |
| |
| local schema = { |
| type = "object", |
| properties = { |
| host = {type = "string"}, |
| port = {type = "integer", minimum = 0}, |
| timeout = {type = "integer", minimum = 1, default = 3}, |
| name = {type = "string", default = "udp logger"}, |
| buffer_duration = {type = "integer", minimum = 1, default = 60}, |
| inactive_timeout = {type = "integer", minimum = 1, default = 5}, |
| batch_max_size = {type = "integer", minimum = 1, default = 1000}, |
| include_req_body = {type = "boolean", default = false} |
| }, |
| required = {"host", "port"} |
| } |
| |
| |
| local _M = { |
| version = 0.1, |
| priority = 400, |
| name = plugin_name, |
| schema = schema, |
| } |
| |
| function _M.check_schema(conf) |
| return core.schema.check(schema, conf) |
| end |
| |
| local function send_udp_data(conf, log_message) |
| local err_msg |
| local res = true |
| local sock = udp() |
| sock:settimeout(conf.timeout * 1000) |
| |
| core.log.info("sending a batch logs to ", conf.host, ":", conf.port) |
| |
| local ok, err = sock:setpeername(conf.host, conf.port) |
| |
| if not ok then |
| return nil, "failed to connect to UDP server: host[" .. conf.host |
| .. "] port[" .. tostring(conf.port) .. "] err: " .. err |
| end |
| |
| ok, err = sock:send(log_message) |
| if not ok then |
| res = false |
| err_msg = "failed to send data to UDP server: host[" .. conf.host |
| .. "] port[" .. tostring(conf.port) .. "] err:" .. err |
| end |
| |
| ok, err = sock:close() |
| if not ok then |
| core.log.error("failed to close the UDP connection, host[", |
| conf.host, "] port[", conf.port, "] ", err) |
| end |
| |
| return res, err_msg |
| end |
| |
| -- remove stale objects from the memory after timer expires |
| local function remove_stale_objects(premature) |
| if premature then |
| return |
| end |
| |
| for key, batch in ipairs(buffers) do |
| if #batch.entry_buffer.entries == 0 and #batch.batch_to_process == 0 then |
| core.log.warn("removing batch processor stale object, conf: ", |
| core.json.delay_encode(key)) |
| buffers[key] = nil |
| end |
| end |
| |
| stale_timer_running = false |
| end |
| |
| |
| function _M.log(conf, ctx) |
| local entry = log_util.get_full_log(ngx, conf) |
| |
| if not stale_timer_running then |
| -- run the timer every 30 mins if any log is present |
| timer_at(1800, remove_stale_objects) |
| stale_timer_running = true |
| end |
| |
| local log_buffer = buffers[conf] |
| if log_buffer then |
| log_buffer:push(entry) |
| return |
| end |
| |
| -- Generate a function to be executed by the batch processor |
| local func = function(entries, batch_max_size) |
| local data, err |
| if batch_max_size == 1 then |
| data, err = core.json.encode(entries[1]) -- encode as single {} |
| else |
| data, err = core.json.encode(entries) -- encode as array [{}] |
| end |
| |
| if not data then |
| return false, 'error occurred while encoding the data: ' .. err |
| end |
| |
| return send_udp_data(conf, data) |
| end |
| |
| local config = { |
| name = conf.name, |
| retry_delay = conf.retry_delay, |
| batch_max_size = conf.batch_max_size, |
| max_retry_count = conf.max_retry_count, |
| buffer_duration = conf.buffer_duration, |
| inactive_timeout = conf.inactive_timeout, |
| route_id = ctx.var.route_id, |
| server_addr = ctx.var.server_addr, |
| } |
| |
| local err |
| log_buffer, err = batch_processor:new(func, config) |
| |
| if not log_buffer then |
| core.log.error("error when creating the batch processor: ", err) |
| return |
| end |
| |
| buffers[conf] = log_buffer |
| log_buffer:push(entry) |
| end |
| |
| return _M |