| -- |
| -- 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 limit_local_new = require("resty.limit.count").new |
| local core = require("apisix.core") |
| local plugin_name = "limit-count" |
| local limit_redis_cluster_new |
| local limit_redis_new |
| do |
| local redis_src = "apisix.plugins.limit-count.limit-count-redis" |
| limit_redis_new = require(redis_src).new |
| |
| local cluster_src = "apisix.plugins.limit-count.limit-count-redis-cluster" |
| limit_redis_cluster_new = require(cluster_src).new |
| end |
| local lrucache = core.lrucache.new({ |
| type = 'plugin', serial_creating = true, |
| }) |
| |
| |
| local schema = { |
| type = "object", |
| properties = { |
| count = {type = "integer", exclusiveMinimum = 0}, |
| time_window = {type = "integer", exclusiveMinimum = 0}, |
| key = { |
| type = "string", |
| enum = {"remote_addr", "server_addr", "http_x_real_ip", |
| "http_x_forwarded_for", "consumer_name", "service_id"}, |
| default = "remote_addr", |
| }, |
| rejected_code = { |
| type = "integer", minimum = 200, maximum = 599, default = 503 |
| }, |
| policy = { |
| type = "string", |
| enum = {"local", "redis", "redis-cluster"}, |
| default = "local", |
| } |
| }, |
| required = {"count", "time_window"}, |
| dependencies = { |
| policy = { |
| oneOf = { |
| { |
| properties = { |
| policy = { |
| enum = {"local"}, |
| }, |
| }, |
| }, |
| { |
| properties = { |
| policy = { |
| enum = {"redis"}, |
| }, |
| redis_host = { |
| type = "string", minLength = 2 |
| }, |
| redis_port = { |
| type = "integer", minimum = 1, default = 6379, |
| }, |
| redis_password = { |
| type = "string", minLength = 0, |
| }, |
| redis_database = { |
| type = "integer", minimum = 0, default = 0, |
| }, |
| redis_timeout = { |
| type = "integer", minimum = 1, default = 1000, |
| }, |
| }, |
| required = {"redis_host"}, |
| }, |
| { |
| properties = { |
| policy = { |
| enum = {"redis-cluster"}, |
| }, |
| redis_cluster_nodes = { |
| type = "array", |
| minItems = 2, |
| items = { |
| type = "string", minLength = 2, maxLength = 100 |
| }, |
| }, |
| redis_password = { |
| type = "string", minLength = 0, |
| }, |
| redis_timeout = { |
| type = "integer", minimum = 1, default = 1000, |
| }, |
| redis_cluster_name = { |
| type = "string", |
| }, |
| }, |
| required = {"redis_cluster_nodes", "redis_cluster_name"}, |
| } |
| } |
| } |
| } |
| } |
| |
| |
| local _M = { |
| version = 0.4, |
| priority = 1002, |
| name = plugin_name, |
| schema = schema, |
| } |
| |
| |
| function _M.check_schema(conf) |
| local ok, err = core.schema.check(schema, conf) |
| if not ok then |
| return false, err |
| end |
| |
| return true |
| end |
| |
| |
| local function create_limit_obj(conf) |
| core.log.info("create new limit-count plugin instance") |
| |
| if not conf.policy or conf.policy == "local" then |
| return limit_local_new("plugin-" .. plugin_name, conf.count, |
| conf.time_window) |
| end |
| |
| if conf.policy == "redis" then |
| return limit_redis_new("plugin-" .. plugin_name, |
| conf.count, conf.time_window, conf) |
| end |
| |
| if conf.policy == "redis-cluster" then |
| return limit_redis_cluster_new("plugin-" .. plugin_name, conf.count, |
| conf.time_window, conf) |
| end |
| |
| return nil |
| end |
| |
| |
| function _M.access(conf, ctx) |
| core.log.info("ver: ", ctx.conf_version) |
| local lim, err = core.lrucache.plugin_ctx(lrucache, ctx, conf.policy, create_limit_obj, conf) |
| if not lim then |
| core.log.error("failed to fetch limit.count object: ", err) |
| return 500 |
| end |
| |
| local key = (ctx.var[conf.key] or "") .. ctx.conf_type .. ctx.conf_version |
| core.log.info("limit key: ", key) |
| |
| local delay, remaining = lim:incoming(key, true) |
| if not delay then |
| local err = remaining |
| if err == "rejected" then |
| return conf.rejected_code |
| end |
| |
| core.log.error("failed to limit req: ", err) |
| return 500, {error_msg = "failed to limit count: " .. err} |
| end |
| |
| core.response.set_header("X-RateLimit-Limit", conf.count, |
| "X-RateLimit-Remaining", remaining) |
| end |
| |
| |
| return _M |