| -- 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. |
| |
| -- This script is for sorting query parameters on incoming requests before doing cache lookup |
| -- so we can get better cache hit ratio |
| -- It can be used in remap.config for a remap rule with the lua plugin. |
| |
| function pairsByKeys(t, f) |
| local a = {} |
| for n in pairs(t) do |
| table.insert(a, n) |
| end |
| table.sort(a, f) |
| local i = 0 -- iterator variable |
| local iter = function() |
| -- iterator function |
| i = i + 1 |
| if a[i] == nil then |
| return nil |
| else |
| return a[i], t[a[i]] |
| end |
| end |
| return iter |
| end |
| |
| function do_remap() |
| t = {} |
| s = ts.client_request.get_uri_args() or "" |
| -- Original String |
| i = 1 |
| for k, v in string.gmatch(s, "([0-9a-zA-Z-_]+)=([0-9a-zA-Z-_]+)") do |
| t[k] = v |
| end |
| |
| output = "" |
| for name, line in pairsByKeys(t) do |
| output = output .. "&" .. name .. "=" .. line |
| end |
| output = string.sub(output, 2) |
| -- Modified String |
| ts.client_request.set_uri_args(output) |
| return 0 |
| end |