| -- |
| -- 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 ext = require("apisix.plugins.ext-plugin.init") |
| local helper = require("apisix.plugins.ext-plugin.helper") |
| local constants = require("apisix.constants") |
| local http = require("resty.http") |
| |
| local ngx = ngx |
| local ngx_print = ngx.print |
| local ngx_flush = ngx.flush |
| local string = string |
| local str_sub = string.sub |
| |
| |
| local name = "ext-plugin-post-resp" |
| local _M = { |
| version = 0.1, |
| priority = -4000, |
| name = name, |
| schema = ext.schema, |
| } |
| |
| |
| local function include_req_headers(ctx) |
| -- TODO: handle proxy_set_header |
| return core.request.headers(ctx) |
| end |
| |
| |
| local function close(http_obj) |
| -- TODO: keepalive |
| local ok, err = http_obj:close() |
| if not ok then |
| core.log.error("close http object failed: ", err) |
| end |
| end |
| |
| |
| local function get_response(ctx, http_obj) |
| local ok, err = http_obj:connect({ |
| scheme = ctx.upstream_scheme, |
| host = ctx.picked_server.host, |
| port = ctx.picked_server.port, |
| }) |
| |
| if not ok then |
| return nil, err |
| end |
| -- TODO: set timeout |
| local uri, args |
| if ctx.var.upstream_uri == "" then |
| -- use original uri instead of rewritten one |
| uri = ctx.var.uri |
| else |
| uri = ctx.var.upstream_uri |
| |
| -- the rewritten one may contain new args |
| local index = core.string.find(uri, "?") |
| if index then |
| local raw_uri = uri |
| uri = str_sub(raw_uri, 1, index - 1) |
| args = str_sub(raw_uri, index + 1) |
| end |
| end |
| local params = { |
| path = uri, |
| query = args or ctx.var.args, |
| headers = include_req_headers(ctx), |
| method = core.request.get_method(), |
| } |
| |
| local body, err = core.request.get_body() |
| if err then |
| return nil, err |
| end |
| |
| if body then |
| params["body"] = body |
| end |
| |
| local res, err = http_obj:request(params) |
| if not res then |
| return nil, err |
| end |
| |
| return res, err |
| end |
| |
| local function send_chunk(chunk) |
| if not chunk then |
| return nil |
| end |
| |
| local ok, print_err = ngx_print(chunk) |
| if not ok then |
| return "output response failed: ".. (print_err or "") |
| end |
| local ok, flush_err = ngx_flush(true) |
| if not ok then |
| core.log.warn("flush response failed: ", flush_err) |
| end |
| |
| return nil |
| end |
| |
| -- TODO: response body is empty (304 or HEAD) |
| -- If the upstream returns 304 or the request method is HEAD, |
| -- there is no response body. In this case, |
| -- we need to send a response to the client in the plugin, |
| -- instead of continuing to execute the subsequent plugin. |
| local function send_response(ctx, res, code) |
| ngx.status = code or res.status |
| |
| local chunks = ctx.runner_ext_response_body |
| if chunks then |
| for i=1, #chunks do |
| local err = send_chunk(chunks[i]) |
| if err then |
| return err |
| end |
| end |
| return |
| end |
| |
| return helper.response_reader(res.body_reader, send_chunk) |
| end |
| |
| |
| function _M.check_schema(conf) |
| return core.schema.check(_M.schema, conf) |
| end |
| |
| |
| function _M.before_proxy(conf, ctx) |
| local http_obj = http.new() |
| local res, err = get_response(ctx, http_obj) |
| if not res or err then |
| core.log.error("failed to request: ", err or "") |
| close(http_obj) |
| return 502 |
| end |
| ctx.runner_ext_response = res |
| |
| core.log.info("response info, status: ", res.status) |
| core.log.info("response info, headers: ", core.json.delay_encode(res.headers)) |
| |
| local code, body = ext.communicate(conf, ctx, name, constants.RPC_HTTP_RESP_CALL) |
| if body then |
| close(http_obj) |
| -- if the body is changed, the code will be set. |
| return code, body |
| end |
| core.log.info("ext-plugin will send response") |
| |
| -- send origin response, status maybe changed. |
| err = send_response(ctx, res, code) |
| close(http_obj) |
| |
| if err then |
| core.log.error(err) |
| return not ngx.headers_sent and 502 or nil |
| end |
| |
| core.log.info("ext-plugin send response succefully") |
| end |
| |
| |
| return _M |