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feat: faas plugin refactoring with url path forwarding (#5616)
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-- | ||
-- 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. | ||
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local ngx = ngx | ||
local require = require | ||
local type = type | ||
local string = string | ||
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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") | ||
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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 | ||
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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"} | ||
} | ||
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local _M = { | ||
version = version, | ||
priority = priority, | ||
name = plugin_name, | ||
schema = schema, | ||
metadata_schema = metadata_schema | ||
} | ||
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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 | ||
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function _M.access(conf, ctx) | ||
local uri_args = core.request.get_uri_args(ctx) | ||
local headers = core.request.headers(ctx) or {} | ||
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local req_body, err = core.request.get_body() | ||
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if err then | ||
core.log.error("error while reading request body: ", err) | ||
return 400 | ||
end | ||
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-- 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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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 | ||
} | ||
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-- Keepalive options | ||
if conf.keepalive then | ||
params.keepalive_timeout = conf.keepalive_timeout | ||
params.keepalive_pool = conf.keepalive_pool | ||
end | ||
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-- 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 | ||
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-- 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 | ||
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-- setting response headers | ||
core.response.set_header(response_headers) | ||
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return res.status, res.body | ||
end | ||
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return _M | ||
end |
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