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-- Copyright (C) by OpenResty Inc.
local ffi = require 'ffi'
local base = require "resty.core.base"
base.allows_subsystem('http')
local C = ffi.C
local ffi_cast = ffi.cast
local ffi_new = ffi.new
local ffi_str = ffi.string
local FFI_OK = base.FFI_OK
local new_tab = base.new_tab
local get_string_buf = base.get_string_buf
local get_request = base.get_request
local setmetatable = setmetatable
local type = type
local tostring = tostring
local error = error
local _M = {
version = base.version
}
ffi.cdef[[
typedef void * ndk_set_var_value_pt;
int ngx_http_lua_ffi_ndk_lookup_directive(const unsigned char *var_data,
size_t var_len, ndk_set_var_value_pt *func);
int ngx_http_lua_ffi_ndk_set_var_get(ngx_http_request_t *r,
ndk_set_var_value_pt func, const unsigned char *arg_data, size_t arg_len,
ngx_http_lua_ffi_str_t *value);
]]
local func_p = ffi_new("void*[1]")
local ffi_str_size = ffi.sizeof("ngx_http_lua_ffi_str_t")
local ffi_str_type = ffi.typeof("ngx_http_lua_ffi_str_t*")
local function ndk_set_var_get(self, var)
if type(var) ~= "string" then
var = tostring(var)
end
if C.ngx_http_lua_ffi_ndk_lookup_directive(var, #var, func_p) ~= FFI_OK then
error('ndk.set_var: directive "' .. var
.. '" not found or does not use ndk_set_var_value', 2)
end
local func = func_p[0]
return function (arg)
local r = get_request()
if not r then
error("no request found")
end
if type(arg) ~= "string" then
arg = tostring(arg)
end
local buf = get_string_buf(ffi_str_size)
local value = ffi_cast(ffi_str_type, buf)
local rc = C.ngx_http_lua_ffi_ndk_set_var_get(r, func, arg, #arg, value)
if rc ~= FFI_OK then
error("calling directive " .. var .. " failed with code " .. rc, 2)
end
return ffi_str(value.data, value.len)
end
end
local function ndk_set_var_set()
error("not allowed", 2)
end
if ndk then
local mt = new_tab(0, 2)
mt.__newindex = ndk_set_var_set
mt.__index = ndk_set_var_get
ndk.set_var = setmetatable(new_tab(0, 0), mt)
end
return _M