| -- |
| -- 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 Client = {} |
| |
| -- Tracing timer does the service and instance register |
| -- After register successfully, it sends traces and heart beat |
| function Client:startBackendTimer(backend_http_uri) |
| local metadata_buffer = ngx.shared.tracing_buffer |
| |
| -- The codes of timer setup is following the OpenResty timer doc |
| local delay = 3 -- in seconds |
| local new_timer = ngx.timer.at |
| local check |
| |
| local log = ngx.log |
| local DEBUG = ngx.DEBUG |
| |
| check = function(premature) |
| if not premature then |
| local serviceId = metadata_buffer:get('serviceId') |
| if (serviceId == nil or serviceId == 0) then |
| self:registerService(metadata_buffer, backend_http_uri) |
| end |
| |
| -- Register is in the async way, if register successfully, go for instance register |
| serviceId = metadata_buffer:get('serviceId') |
| if (serviceId ~= nil and serviceId ~= 0) then |
| local serviceInstId = metadata_buffer:get('serviceInstId') |
| if (serviceInstId == nil or serviceInstId == 0) then |
| self:registerServiceInstance(metadata_buffer, backend_http_uri) |
| end |
| end |
| |
| -- After all register successfully, begin to send trace segments |
| local serviceInstId = metadata_buffer:get('serviceInstId') |
| if (serviceInstId ~= nil and serviceInstId ~= 0) then |
| self:reportTraces(metadata_buffer, backend_http_uri) |
| self:ping(metadata_buffer, backend_http_uri) |
| end |
| |
| -- do the health check |
| local ok, err = new_timer(delay, check) |
| if not ok then |
| log(ERR, "failed to create timer: ", err) |
| return |
| end |
| end |
| end |
| |
| if 0 == ngx.worker.id() then |
| local ok, err = new_timer(delay, check) |
| if not ok then |
| log(ERR, "failed to create timer: ", err) |
| return |
| end |
| end |
| end |
| |
| -- Register service |
| function Client:registerService(metadata_buffer, backend_http_uri) |
| local log = ngx.log |
| local DEBUG = ngx.DEBUG |
| local ERR = ngx.ERR |
| |
| local serviceName = metadata_buffer:get('serviceName') |
| |
| local cjson = require('cjson') |
| local serviceRegister = require("register").newServiceRegister(serviceName) |
| local serviceRegisterParam = cjson.encode(serviceRegister) |
| |
| local http = require('resty.http') |
| local httpc = http.new() |
| local res, err = httpc:request_uri(backend_http_uri .. '/v2/service/register', { |
| method = "POST", |
| body = serviceRegisterParam, |
| headers = { |
| ["Content-Type"] = "application/json", |
| }, |
| }) |
| |
| if not res then |
| log(ERR, "Service register fails, " .. err) |
| elseif res.status == 200 then |
| log(DEBUG, "Service register response = " .. res.body) |
| local registerResults = cjson.decode(res.body) |
| |
| for i, result in ipairs(registerResults) |
| do |
| if result.key == serviceName then |
| local serviceId = result.value |
| log(DEBUG, "Service registered, service id = " .. serviceId) |
| metadata_buffer:set('serviceId', serviceId) |
| end |
| end |
| else |
| log(ERR, "Service register fails, response code " .. res.status) |
| end |
| end |
| |
| -- Register service instance |
| function Client:registerServiceInstance(metadata_buffer, backend_http_uri) |
| local log = ngx.log |
| local DEBUG = ngx.DEBUG |
| local ERR = ngx.ERR |
| |
| local serviceInstName = 'name:' .. metadata_buffer:get('serviceInstanceName') |
| metadata_buffer:set('serviceInstanceUUID', serviceInstName) |
| |
| local cjson = require('cjson') |
| local serviceInstanceRegister = require("register").newServiceInstanceRegister( |
| metadata_buffer:get('serviceId'), |
| serviceInstName, |
| ngx.now() * 1000) |
| local serviceInstanceRegisterParam = cjson.encode(serviceInstanceRegister) |
| |
| local http = require('resty.http') |
| local httpc = http.new() |
| local res, err = httpc:request_uri(backend_http_uri .. '/v2/instance/register', { |
| method = "POST", |
| body = serviceInstanceRegisterParam, |
| headers = { |
| ["Content-Type"] = "application/json", |
| }, |
| }) |
| |
| if err == nil then |
| if res.status == 200 then |
| log(DEBUG, "Service Instance register response = " .. res.body) |
| local registerResults = cjson.decode(res.body) |
| |
| for i, result in ipairs(registerResults) |
| do |
| if result.key == serviceInstName then |
| local serviceId = result.value |
| log(DEBUG, "Service Instance registered, service instance id = " .. serviceId) |
| metadata_buffer:set('serviceInstId', serviceId) |
| end |
| end |
| else |
| log(ERR, "Service Instance register fails, response code " .. res.status) |
| end |
| else |
| log(ERR, "Service Instance register fails, " .. err) |
| end |
| end |
| |
| -- Ping the backend to update instance heartheat |
| function Client:ping(metadata_buffer, backend_http_uri) |
| local log = ngx.log |
| local DEBUG = ngx.DEBUG |
| local ERR = ngx.ERR |
| |
| local cjson = require('cjson') |
| local pingPkg = require("register").newServiceInstancePingPkg( |
| metadata_buffer:get('serviceInstId'), |
| metadata_buffer:get('serviceInstanceUUID'), |
| ngx.now() * 1000) |
| local pingPkgParam = cjson.encode(pingPkg) |
| |
| local http = require('resty.http') |
| local httpc = http.new() |
| local res, err = httpc:request_uri(backend_http_uri .. '/v2/instance/heartbeat', { |
| method = "POST", |
| body = pingPkgParam, |
| headers = { |
| ["Content-Type"] = "application/json", |
| }, |
| }) |
| |
| if err == nil then |
| if res.status ~= 200 then |
| log(ERR, "Agent ping fails, response code " .. res.status) |
| end |
| else |
| log(ERR, "Agent ping fails, " .. err) |
| end |
| end |
| |
| -- Report trace segments to the backend |
| function Client:reportTraces(metadata_buffer, backend_http_uri) |
| local log = ngx.log |
| local DEBUG = ngx.DEBUG |
| local ERR = ngx.ERR |
| |
| local queue = ngx.shared.tracing_buffer |
| local segment = queue:rpop('segment') |
| |
| local count = 0; |
| |
| local http = require('resty.http') |
| local httpc = http.new() |
| |
| while segment ~= nil |
| do |
| local res, err = httpc:request_uri(backend_http_uri .. '/v2/segments', { |
| method = "POST", |
| body = segment, |
| headers = { |
| ["Content-Type"] = "application/json", |
| }, |
| }) |
| |
| if err == nil then |
| if res.status ~= 200 then |
| log(ERR, "Segment report fails, response code " .. res.status) |
| break |
| else |
| count = count + 1 |
| end |
| else |
| log(ERR, "Segment report fails, " .. err) |
| break |
| end |
| |
| segment = queue:rpop('segment') |
| end |
| |
| if count > 0 then |
| log(DEBUG, count, " segments reported.") |
| end |
| end |
| |
| return Client |