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-- Copyright (C) Yichun Zhang (agentzh)
local ffi = require "ffi"
local debug = require "debug"
local base = require "resty.core.base"
local misc = require "resty.core.misc"
local C = ffi.C
local register_getter = misc.register_ngx_magic_key_getter
local register_setter = misc.register_ngx_magic_key_setter
local registry = debug.getregistry()
local new_tab = base.new_tab
local ref_in_table = base.ref_in_table
local unref_in_table = base.unref_in_table
local get_request = base.get_request
local FFI_NO_REQ_CTX = base.FFI_NO_REQ_CTX
local FFI_OK = base.FFI_OK
local error = error
local setmetatable = setmetatable
local type = type
local subsystem = ngx.config.subsystem
local ngx_lua_ffi_get_ctx_ref
local ngx_lua_ffi_set_ctx_ref
if subsystem == "http" then
ffi.cdef[[
int ngx_http_lua_ffi_get_ctx_ref(ngx_http_request_t *r, int *in_ssl_phase,
int *ssl_ctx_ref);
int ngx_http_lua_ffi_set_ctx_ref(ngx_http_request_t *r, int ref);
]]
ngx_lua_ffi_get_ctx_ref = C.ngx_http_lua_ffi_get_ctx_ref
ngx_lua_ffi_set_ctx_ref = C.ngx_http_lua_ffi_set_ctx_ref
elseif subsystem == "stream" then
ffi.cdef[[
int ngx_stream_lua_ffi_get_ctx_ref(ngx_stream_lua_request_t *r,
int *in_ssl_phase, int *ssl_ctx_ref);
int ngx_stream_lua_ffi_set_ctx_ref(ngx_stream_lua_request_t *r, int ref);
]]
ngx_lua_ffi_get_ctx_ref = C.ngx_stream_lua_ffi_get_ctx_ref
ngx_lua_ffi_set_ctx_ref = C.ngx_stream_lua_ffi_set_ctx_ref
end
local _M = {
_VERSION = base.version
}
-- use a new ctxs table to make LuaJIT JIT compiler happy to generate more
-- efficient machine code.
local ctxs = {}
registry.ngx_lua_ctx_tables = ctxs
local get_ctx_table
do
local in_ssl_phase = ffi.new("int[1]")
local ssl_ctx_ref = ffi.new("int[1]")
function get_ctx_table(ctx)
local r = get_request()
if not r then
error("no request found")
end
local ctx_ref = ngx_lua_ffi_get_ctx_ref(r, in_ssl_phase, ssl_ctx_ref)
if ctx_ref == FFI_NO_REQ_CTX then
error("no request ctx found")
end
if ctx_ref < 0 then
ctx_ref = ssl_ctx_ref[0]
if ctx_ref > 0 and ctxs[ctx_ref] then
if in_ssl_phase[0] ~= 0 then
return ctxs[ctx_ref]
end
if not ctx then
ctx = new_tab(0, 4)
end
ctx = setmetatable(ctx, ctxs[ctx_ref])
else
if in_ssl_phase[0] ~= 0 then
if not ctx then
ctx = new_tab(1, 4)
end
-- to avoid creating another table, we assume the users
-- won't overwrite the `__index` key
ctx.__index = ctx
elseif not ctx then
ctx = new_tab(0, 4)
end
end
ctx_ref = ref_in_table(ctxs, ctx)
if ngx_lua_ffi_set_ctx_ref(r, ctx_ref) ~= FFI_OK then
unref_in_table(ctxs, ctx_ref)
return nil
end
return ctx
end
return ctxs[ctx_ref]
end
end
register_getter("ctx", get_ctx_table)
_M.get_ctx_table = get_ctx_table
local function set_ctx_table(ctx)
local ctx_type = type(ctx)
if ctx_type ~= "table" then
error("ctx should be a table while getting a " .. ctx_type)
end
local r = get_request()
if not r then
error("no request found")
end
local ctx_ref = ngx_lua_ffi_get_ctx_ref(r, nil, nil)
if ctx_ref == FFI_NO_REQ_CTX then
error("no request ctx found")
end
if ctx_ref < 0 then
ctx_ref = ref_in_table(ctxs, ctx)
if ngx_lua_ffi_set_ctx_ref(r, ctx_ref) ~= FFI_OK then
unref_in_table(ctxs, ctx_ref)
error("no memory")
end
return
end
ctxs[ctx_ref] = ctx
end
register_setter("ctx", set_ctx_table)
return _M