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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.
-- 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
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