[GitHub] [apisix] tzssangglass commented on a change in pull request #6614: feat: support reading configuration form xds(mvp)

[GitBox <gi...@apache.org>]

tzssangglass commented on a change in pull request #6614:
URL: https://github.com/apache/apisix/pull/6614#discussion_r829251430



##########
File path: apisix/core/config_xds.lua
##########
@@ -0,0 +1,119 @@
+--
+-- 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.
+--
+
+--- Get configuration form ngx.shared.DICT.
+--
+-- @module core.config_xds
+
+local base              = require("resty.core.base")
+local config_local      = require("apisix.core.config_local")
+local table             = table
+local error             = error
+local is_http           = ngx.config.subsystem == "http"
+local io                = io
+local io_open           = io.open
+local io_close          = io.close
+local package           = package
+local new_tab           = base.new_tab
+local ffi               = require ("ffi")
+local C                 = ffi.C
+local router_config     = ngx.shared["router-config"]
+local ngx_re_match      = ngx.re.match
+local ngx_re_gmatch     = ngx.re.gmatch
+
+local process
+if is_http then
+    process = require("ngx.process")
+end
+
+
+ffi.cdef[[
+extern void initial(void* router_zone_ptr);
+]]
+
+
+local _M = {
+    version = 0.1,
+    local_conf = config_local.local_conf,
+}
+
+
+-- todo: refactor this function in chash.lua and radixtree.lua
+local function load_shared_lib(lib_name)
+    local cpath = package.cpath
+    local tried_paths = new_tab(32, 0)
+    local i = 1
+
+    local iter, err = ngx_re_gmatch(cpath, "[^;]+", "jo")
+    if not iter then
+        error("failed to gmatch: " .. err)
+    end
+
+    while true do
+        local it = iter()
+        local fpath
+        fpath, err = ngx_re_match(it[0], "(.*/)",  "jo")
+        if err then
+            error("failed to match: " .. err)
+        end
+        local spath = fpath[0] .. lib_name
+
+        local f = io_open(spath)
+        if f ~= nil then
+            io_close(f)
+            return ffi.load(spath)
+        end
+        tried_paths[i] = spath
+        i = i + 1
+
+        if not it then
+            break
+        end
+    end
+
+    return nil, tried_paths
+end
+
+
+local function load_libxds(lib_name)
+    local xdsagent, tried_paths = load_shared_lib(lib_name)
+
+    if not xdsagent then
+        tried_paths[#tried_paths + 1] = 'tried above paths but can not load ' .. lib_name
+        error("can not load Amesh library, tried paths: " ..
+              table.concat(tried_paths, '\r\n', 1, #tried_paths))
+    end
+
+    local router_zone = C.ngx_http_lua_ffi_shdict_udata_to_zone(router_config[1])
+    local router_shd_cdata = ffi.cast("void*", router_zone)
+    xdsagent.initial(router_shd_cdata)
+end
+
+
+
+function _M.init_worker()
+    local lib_name = "libxds.so"

Review comment:
       updated




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