| -- |
| -- 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 url = require("net.url") |
| |
| local math_random = math.random |
| local has_mod, apisix_ngx_client = pcall(require, "resty.apisix.client") |
| |
| |
| local plugin_name = "proxy-mirror" |
| local schema = { |
| type = "object", |
| properties = { |
| host = { |
| type = "string", |
| pattern = [=[^(http(s)?|grpc(s)?):\/\/([\da-zA-Z.-]+|\[[\da-fA-F:]+\])(:\d+)?$]=], |
| }, |
| path = { |
| type = "string", |
| pattern = [[^/[^?&]+$]], |
| }, |
| path_concat_mode = { |
| type = "string", |
| default = "replace", |
| enum = {"replace", "prefix"}, |
| description = "the concatenation mode for custom path" |
| }, |
| sample_ratio = { |
| type = "number", |
| minimum = 0.00001, |
| maximum = 1, |
| default = 1, |
| }, |
| }, |
| required = {"host"}, |
| } |
| |
| local _M = { |
| version = 0.1, |
| priority = 1010, |
| 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 resolver_host(prop_host) |
| local url_decoded = url.parse(prop_host) |
| local decoded_host = url_decoded.host |
| if not core.utils.parse_ipv4(decoded_host) and not core.utils.parse_ipv6(decoded_host) then |
| local ip, err = core.resolver.parse_domain(decoded_host) |
| |
| if not ip then |
| core.log.error("dns resolver resolves domain: ", decoded_host," error: ", err, |
| " will continue to use the host: ", decoded_host) |
| return url_decoded.scheme, prop_host |
| end |
| |
| local host = url_decoded.scheme .. '://' .. ip .. |
| (url_decoded.port and ':' .. url_decoded.port or '') |
| core.log.info(prop_host, " is resolved to: ", host) |
| return url_decoded.scheme, host |
| end |
| return url_decoded.scheme, prop_host |
| end |
| |
| |
| local function enable_mirror(ctx, conf) |
| local uri = (ctx.var.upstream_uri and ctx.var.upstream_uri ~= "") and |
| ctx.var.upstream_uri or |
| ctx.var.uri .. ctx.var.is_args .. (ctx.var.args or '') |
| |
| if conf.path then |
| if conf.path_concat_mode == "prefix" then |
| uri = conf.path .. uri |
| else |
| uri = conf.path .. ctx.var.is_args .. (ctx.var.args or '') |
| end |
| end |
| |
| local _, mirror_host = resolver_host(conf.host) |
| ctx.var.upstream_mirror_host = mirror_host |
| ctx.var.upstream_mirror_uri = mirror_host .. uri |
| |
| if has_mod then |
| apisix_ngx_client.enable_mirror() |
| end |
| end |
| |
| |
| function _M.rewrite(conf, ctx) |
| core.log.info("proxy mirror plugin rewrite phase, conf: ", core.json.delay_encode(conf)) |
| |
| if conf.sample_ratio == 1 then |
| enable_mirror(ctx, conf) |
| ctx.enable_mirror = true |
| else |
| local val = math_random() |
| core.log.info("mirror request sample_ratio conf: ", conf.sample_ratio, |
| ", random value: ", val) |
| if val < conf.sample_ratio then |
| enable_mirror(ctx, conf) |
| ctx.enable_mirror = true |
| end |
| end |
| |
| end |
| |
| |
| return _M |