| -- |
| -- 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 expr = require("resty.expr.v1") |
| |
| local sleep = core.sleep |
| local random = math.random |
| local ipairs = ipairs |
| |
| local plugin_name = "fault-injection" |
| |
| |
| local schema = { |
| type = "object", |
| properties = { |
| abort = { |
| type = "object", |
| properties = { |
| http_status = {type = "integer", minimum = 200}, |
| body = {type = "string", minLength = 0}, |
| percentage = {type = "integer", minimum = 0, maximum = 100}, |
| vars = { |
| type = "array", |
| maxItems = 20, |
| item = { |
| type = "array", |
| }, |
| } |
| }, |
| required = {"http_status"}, |
| }, |
| delay = { |
| type = "object", |
| properties = { |
| duration = {type = "number", minimum = 0}, |
| percentage = {type = "integer", minimum = 0, maximum = 100}, |
| vars = { |
| type = "array", |
| maxItems = 20, |
| item = { |
| type = "array", |
| }, |
| } |
| }, |
| required = {"duration"}, |
| } |
| }, |
| minProperties = 1, |
| } |
| |
| |
| local _M = { |
| version = 0.1, |
| priority = 11000, |
| name = plugin_name, |
| schema = schema, |
| } |
| |
| |
| local function sample_hit(percentage) |
| if not percentage then |
| return true |
| end |
| |
| return random(1, 100) <= percentage |
| end |
| |
| |
| local function vars_match(vars, ctx) |
| local match_result |
| for _, var in ipairs(vars) do |
| local expr, _ = expr.new(var) |
| match_result = expr:eval(ctx.var) |
| if match_result then |
| break |
| end |
| end |
| |
| return match_result |
| end |
| |
| |
| function _M.check_schema(conf) |
| local ok, err = core.schema.check(schema, conf) |
| if not ok then |
| return false, err |
| end |
| |
| if conf.abort and conf.abort.vars then |
| for _, var in ipairs(conf.abort.vars) do |
| local _, err = expr.new(var) |
| if err then |
| core.log.error("failed to create vars expression: ", err) |
| return false, err |
| end |
| end |
| end |
| |
| if conf.delay and conf.delay.vars then |
| for _, var in ipairs(conf.delay.vars) do |
| local _, err = expr.new(var) |
| if err then |
| core.log.error("failed to create vars expression: ", err) |
| return false, err |
| end |
| end |
| end |
| |
| return true |
| end |
| |
| |
| function _M.rewrite(conf, ctx) |
| core.log.info("plugin rewrite phase, conf: ", core.json.delay_encode(conf)) |
| |
| local abort_vars = true |
| if conf.abort and conf.abort.vars then |
| abort_vars = vars_match(conf.abort.vars, ctx) |
| end |
| core.log.info("abort_vars: ", abort_vars) |
| |
| local delay_vars = true |
| if conf.delay and conf.delay.vars then |
| delay_vars = vars_match(conf.delay.vars, ctx) |
| end |
| core.log.info("delay_vars: ", delay_vars) |
| |
| if conf.delay and sample_hit(conf.delay.percentage) and delay_vars then |
| sleep(conf.delay.duration) |
| end |
| |
| if conf.abort and sample_hit(conf.abort.percentage) and abort_vars then |
| return conf.abort.http_status, core.utils.resolve_var(conf.abort.body, ctx.var) |
| end |
| end |
| |
| |
| return _M |