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feat: faas plugin refactoring with url path forwarding (#5616)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| -- | ||
| -- 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 ngx = ngx | ||
| local require = require | ||
| local type = type | ||
| local string = string | ||
|
|
||
| return function(plugin_name, version, priority, request_processor, authz_schema, metadata_schema) | ||
| local core = require("apisix.core") | ||
| local http = require("resty.http") | ||
| local url = require("net.url") | ||
|
|
||
| if request_processor and type(request_processor) ~= "function" then | ||
| return "Failed to generate plugin due to invalid header processor type, " .. | ||
| "expected: function, received: " .. type(request_processor) | ||
| end | ||
|
|
||
| local schema = { | ||
| type = "object", | ||
| properties = { | ||
| function_uri = {type = "string"}, | ||
| authorization = authz_schema, | ||
| timeout = {type = "integer", minimum = 100, default = 3000}, | ||
| ssl_verify = {type = "boolean", default = true}, | ||
| keepalive = {type = "boolean", default = true}, | ||
| keepalive_timeout = {type = "integer", minimum = 1000, default = 60000}, | ||
| keepalive_pool = {type = "integer", minimum = 1, default = 5} | ||
| }, | ||
| required = {"function_uri"} | ||
| } | ||
|
|
||
| local _M = { | ||
| version = version, | ||
| priority = priority, | ||
| name = plugin_name, | ||
| schema = schema, | ||
| metadata_schema = metadata_schema | ||
| } | ||
|
|
||
| function _M.check_schema(conf, schema_type) | ||
| if schema_type == core.schema.TYPE_METADATA then | ||
| return core.schema.check(metadata_schema, conf) | ||
| end | ||
| return core.schema.check(schema, conf) | ||
| end | ||
|
|
||
| function _M.access(conf, ctx) | ||
| local uri_args = core.request.get_uri_args(ctx) | ||
| local headers = core.request.headers(ctx) or {} | ||
|
|
||
| local req_body, err = core.request.get_body() | ||
|
|
||
| if err then | ||
| core.log.error("error while reading request body: ", err) | ||
| return 400 | ||
| end | ||
|
|
||
| -- forward the url path came through the matched uri | ||
| local url_decoded = url.parse(conf.function_uri) | ||
| local path = url_decoded.path or "/" | ||
|
|
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| if ctx.curr_req_matched and ctx.curr_req_matched[":ext"] then | ||
| local end_path = ctx.curr_req_matched[":ext"] | ||
|
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| if path:byte(-1) == string.byte("/") or end_path:byte(1) == string.byte("/") then | ||
| path = path .. end_path | ||
| else | ||
| path = path .. "/" .. end_path | ||
| end | ||
| end | ||
|
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||
|
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| headers["host"] = url_decoded.host | ||
| local params = { | ||
| method = ngx.req.get_method(), | ||
| body = req_body, | ||
| query = uri_args, | ||
| headers = headers, | ||
| path = path, | ||
| keepalive = conf.keepalive, | ||
| ssl_verify = conf.ssl_verify | ||
| } | ||
|
|
||
| -- Keepalive options | ||
| if conf.keepalive then | ||
| params.keepalive_timeout = conf.keepalive_timeout | ||
| params.keepalive_pool = conf.keepalive_pool | ||
| end | ||
|
|
||
| -- modify request info (if required) | ||
| request_processor(conf, ctx, params) | ||
|
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| local httpc = http.new() | ||
| httpc:set_timeout(conf.timeout) | ||
|
|
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| local res, err = httpc:request_uri(conf.function_uri, params) | ||
|
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| if not res or err then | ||
| core.log.error("failed to process ", plugin_name, ", err: ", err) | ||
| return 503 | ||
| end | ||
|
|
||
| -- According to RFC7540 https://datatracker.ietf.org/doc/html/rfc7540#section-8.1.2.2, | ||
| -- endpoint must not generate any connection specific headers for HTTP/2 requests. | ||
| local response_headers = res.headers | ||
| if ngx.var.http2 then | ||
| response_headers["Connection"] = nil | ||
| response_headers["Keep-Alive"] = nil | ||
| response_headers["Proxy-Connection"] = nil | ||
| response_headers["Upgrade"] = nil | ||
| response_headers["Transfer-Encoding"] = nil | ||
| end | ||
|
|
||
| -- setting response headers | ||
| core.response.set_header(response_headers) | ||
|
|
||
| return res.status, res.body | ||
| end | ||
|
|
||
| return _M | ||
| end |
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