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-- Copyright (C) Yichun Zhang (agentzh)
local ffi = require "ffi"
local base = require "resty.core.base"
local C = ffi.C
local ffi_new = ffi.new
local ffi_str = ffi.string
local type = type
local error = error
local tostring = tostring
local setmetatable = setmetatable
local get_request = base.get_request
local get_string_buf = base.get_string_buf
local get_size_ptr = base.get_size_ptr
local new_tab = base.new_tab
local subsystem = ngx.config.subsystem
local ngx_lua_ffi_var_get
local ngx_lua_ffi_var_set
local ERR_BUF_SIZE = 256
ngx.var = new_tab(0, 0)
if subsystem == "http" then
ffi.cdef[[
int ngx_http_lua_ffi_var_get(ngx_http_request_t *r,
const char *name_data, size_t name_len, char *lowcase_buf,
int capture_id, char **value, size_t *value_len, char **err);
int ngx_http_lua_ffi_var_set(ngx_http_request_t *r,
const unsigned char *name_data, size_t name_len,
unsigned char *lowcase_buf, const unsigned char *value,
size_t value_len, unsigned char *errbuf, size_t *errlen);
]]
ngx_lua_ffi_var_get = C.ngx_http_lua_ffi_var_get
ngx_lua_ffi_var_set = C.ngx_http_lua_ffi_var_set
elseif subsystem == "stream" then
ffi.cdef[[
int ngx_stream_lua_ffi_var_get(ngx_stream_lua_request_t *r,
const char *name_data, size_t name_len, char *lowcase_buf,
int capture_id, char **value, size_t *value_len, char **err);
int ngx_stream_lua_ffi_var_set(ngx_stream_lua_request_t *r,
const unsigned char *name_data, size_t name_len,
unsigned char *lowcase_buf, const unsigned char *value,
size_t value_len, unsigned char *errbuf, size_t *errlen);
]]
ngx_lua_ffi_var_get = C.ngx_stream_lua_ffi_var_get
ngx_lua_ffi_var_set = C.ngx_stream_lua_ffi_var_set
end
local value_ptr = ffi_new("unsigned char *[1]")
local errmsg = base.get_errmsg_ptr()
local function var_get(self, name)
local r = get_request()
if not r then
error("no request found")
end
local value_len = get_size_ptr()
local rc
if type(name) == "number" then
rc = ngx_lua_ffi_var_get(r, nil, 0, nil, name, value_ptr, value_len,
errmsg)
else
if type(name) ~= "string" then
error("bad variable name", 2)
end
local name_len = #name
local lowcase_buf = get_string_buf(name_len)
rc = ngx_lua_ffi_var_get(r, name, name_len, lowcase_buf, 0, value_ptr,
value_len, errmsg)
end
-- ngx.log(ngx.WARN, "rc = ", rc)
if rc == 0 then -- NGX_OK
return ffi_str(value_ptr[0], value_len[0])
end
if rc == -5 then -- NGX_DECLINED
return nil
end
if rc == -1 then -- NGX_ERROR
error(ffi_str(errmsg[0]), 2)
end
end
local function var_set(self, name, value)
local r = get_request()
if not r then
error("no request found")
end
if type(name) ~= "string" then
error("bad variable name", 2)
end
local name_len = #name
local errlen = get_size_ptr()
errlen[0] = ERR_BUF_SIZE
local lowcase_buf = get_string_buf(name_len + ERR_BUF_SIZE)
local value_len
if value == nil then
value_len = 0
else
if type(value) ~= 'string' then
value = tostring(value)
end
value_len = #value
end
local errbuf = lowcase_buf + name_len
local rc = ngx_lua_ffi_var_set(r, name, name_len, lowcase_buf, value,
value_len, errbuf, errlen)
-- ngx.log(ngx.WARN, "rc = ", rc)
if rc == 0 then -- NGX_OK
return
end
if rc == -1 then -- NGX_ERROR
error(ffi_str(errbuf, errlen[0]), 2)
end
end
do
local mt = new_tab(0, 2)
mt.__index = var_get
mt.__newindex = var_set
setmetatable(ngx.var, mt)
end
return {
version = base.version
}