| -- |
| -- 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 sw_tracer = require("skywalking.tracer") |
| local core = require("apisix.core") |
| local process = require("ngx.process") |
| local Span = require("skywalking.span") |
| local ngx = ngx |
| local math = math |
| local require = require |
| |
| local plugin_name = "skywalking" |
| local metadata_schema = { |
| type = "object", |
| properties = { |
| service_name = { |
| type = "string", |
| description = "service name for skywalking", |
| default = "APISIX", |
| }, |
| service_instance_name = { |
| type = "string", |
| description = "User Service Instance Name", |
| default = "APISIX Instance Name", |
| }, |
| endpoint_addr = { |
| type = "string", |
| default = "http://127.0.0.1:12800", |
| }, |
| report_interval = { |
| type = "integer", |
| }, |
| }, |
| additionalProperties = false, |
| } |
| |
| local schema = { |
| type = "object", |
| properties = { |
| sample_ratio = { |
| type = "number", |
| minimum = 0.00001, |
| maximum = 1, |
| default = 1 |
| } |
| }, |
| additionalProperties = false, |
| } |
| |
| |
| local _M = { |
| version = 0.1, |
| priority = -1100, -- last running plugin, but before serverless post func |
| name = plugin_name, |
| schema = schema, |
| metadata_schema = metadata_schema, |
| } |
| |
| |
| function _M.check_schema(conf) |
| return core.schema.check(schema, conf) |
| end |
| |
| |
| function _M.rewrite(conf, ctx) |
| core.log.debug("rewrite phase of skywalking plugin") |
| ctx.skywalking_sample = false |
| if conf.sample_ratio == 1 or math.random() < conf.sample_ratio then |
| ctx.skywalking_sample = true |
| sw_tracer:start("upstream service") |
| core.log.info("tracer start") |
| return |
| end |
| |
| core.log.info("miss sampling, ignore") |
| end |
| |
| |
| function _M.body_filter(conf, ctx) |
| if ctx.skywalking_sample and ngx.arg[2] then |
| Span.setComponentId(ngx.ctx.exitSpan, 6002) |
| Span.setComponentId(ngx.ctx.entrySpan, 6002) |
| sw_tracer:finish() |
| core.log.info("tracer finish") |
| end |
| end |
| |
| |
| function _M.log(conf, ctx) |
| if ctx.skywalking_sample then |
| sw_tracer:prepareForReport() |
| core.log.info("tracer prepare for report") |
| end |
| end |
| |
| |
| function _M.init() |
| if process.type() ~= "worker" then |
| return |
| end |
| |
| local local_conf = core.config.local_conf() |
| local local_plugin_info = core.table.try_read_attr(local_conf, |
| "plugin_attr", |
| plugin_name) or {} |
| local_plugin_info = core.table.clone(local_plugin_info) |
| local ok, err = core.schema.check(metadata_schema, local_plugin_info) |
| if not ok then |
| core.log.error("failed to check the plugin_attr[", plugin_name, "]", |
| ": ", err) |
| return |
| end |
| |
| core.log.info("plugin attribute: ", |
| core.json.delay_encode(local_plugin_info)) |
| |
| -- TODO: maybe need to fetch them from plugin-metadata |
| local metadata_shdict = ngx.shared.tracing_buffer |
| |
| if local_plugin_info.service_instance_name == "$hostname" then |
| local_plugin_info.service_instance_name = core.utils.gethostname() |
| end |
| |
| metadata_shdict:set('serviceName', local_plugin_info.service_name) |
| metadata_shdict:set('serviceInstanceName', local_plugin_info.service_instance_name) |
| |
| local sk_cli = require("skywalking.client") |
| if local_plugin_info.report_interval then |
| sk_cli.backendTimerDelay = local_plugin_info.report_interval |
| end |
| |
| sk_cli:startBackendTimer(local_plugin_info.endpoint_addr) |
| end |
| |
| |
| function _M.destroy() |
| if process.type() ~= "worker" then |
| return |
| end |
| |
| local sk_cli = require("skywalking.client") |
| sk_cli:destroyBackendTimer() |
| end |
| |
| |
| return _M |