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MEDIUM: lua: Add ifexist parameter to set_var

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As discussed in GitHub issue #624 Lua scripts should not use
variables that are never going to be read, because the memory
for variable names is never going to be freed.

Add an optional `ifexist` parameter to the `set_var` function
that allows a Lua developer to set variables that are going to
be ignored if the variable name was not used elsewhere before.

Usually this mean that there is no `var()` sample fetch for the
variable in question within the configuration.
This commit is contained in:
Tim Duesterhus
2020-05-19 13:49:42 +02:00
committed by Christopher Faulet
parent 84ebc136a1
commit 4e172c93f9
4 changed files with 75 additions and 10 deletions
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13
reg-tests/lua/set_var.lua
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@@ -10,3 +10,16 @@ core.register_service("set_var", "http", function(applet)
applet:start_response()
applet:send("")
end)
core.register_service("set_var_ifexist", "http", function(applet)
local var_name = applet.headers["var"][0]
local result = applet:set_var(var_name, "value", true)
if result then
applet:set_status(202)
else
applet:set_status(400)
end
applet:add_header("echo", applet:get_var(var_name) or "(nil)")
applet:start_response()
applet:send("")
end)