| -- |
| -- 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. |
| -- |
| local util = require("shenyu.register.core.utils") |
| local const = require("shenyu.register.zookeeper.zk_const") |
| local proto = require("shenyu.register.zookeeper.zk_proto") |
| local connection = require("shenyu.register.zookeeper.connection") |
| local ngx_log = ngx.log |
| local now = ngx.now |
| local exiting = ngx.worker.exiting |
| local sleep = ngx.sleep |
| local strlen = string.len |
| local _timeout = 60 * 1000 |
| local _M = { |
| } |
| local mt = { __index = _M } |
| |
| function _M.new(self) |
| --- @type table |
| local conn_, err = connection:new() |
| if not conn_ then |
| return nil, "initialized connection error" .. err |
| end |
| conn_:set_timeout(_timeout) |
| conn_:set_keepalive() |
| return setmetatable({ conn = conn_, children_listener = {} }, mt) |
| end |
| |
| function _M.connect(self, host) |
| -- body |
| local conn = self.conn |
| ---@type table |
| local iptables = util.paras_host(host, ":") |
| local ip = iptables[1] |
| local port = iptables[2] |
| local byt = conn:connect(ip, port) |
| if not byt then |
| return nil, "connection error" .. host |
| end |
| local bytes = proto:serialize(proto.request_header, proto.connect_request) |
| local b, err = conn:write(bytes) |
| if not b then |
| return nil, "connection error " .. ip + ":" .. port |
| end |
| local len = conn:read_len() |
| if not len then |
| return nil, "error" |
| end |
| local bytes = conn:read(len) |
| if not bytes then |
| return nil, "connection read error" |
| end |
| local rsp = proto.connect_response:unpack(bytes, 1) |
| if not rsp then |
| return nil, "read connection response error" |
| end |
| self.xid = 0 |
| local t = rsp.timeout |
| self.session_timeout = rsp.timeout |
| self.ping_time = (t / 3) / 1000 |
| self.host = host |
| self.session_id = rsp.session_id |
| local tostring = "proto_ver:" .. rsp.proto_ver .. "," .. "timeout:" .. rsp.timeout .. "," .. "session_id:" .. util.long_to_hex_string(rsp.session_id) |
| ngx_log(ngx.INFO, tostring) |
| return true, nil |
| end |
| |
| function _M.get_children(self, path) |
| return self:_get_children(path, 0) |
| end |
| |
| function _M._get_children(self, path, is_watch) |
| local conn = self.conn |
| if not conn then |
| return nil, "not initialized connection" |
| end |
| local xid = self.xid + 1 |
| local h = proto.request_header |
| h.xid = xid |
| h.type = const.ZOO_GET_CHILDREN |
| local r = proto.get_children_request |
| r.path = path |
| r.watch = is_watch |
| local req = proto:serialize(h, r) |
| local bytes, err = conn:write(req) |
| if not bytes then |
| return bytes, "write bytes error" |
| end |
| -- If other data is received, it means that the data of the _get_children command has not been received |
| :: continue :: |
| local rsp_header, bytes, end_index = conn:read_header() |
| if not rsp_header then |
| return nil, "read headler error" |
| end |
| if rsp_header.err ~= 0 then |
| ngx_log(ngx.ERR, "zookeeper remote error: " .. const.get_err_msg(rsp_header.err) .. "," .. path) |
| return nil, const.get_err_msg(rsp_header.err) |
| end |
| if strlen(bytes) > 16 and rsp_header.xid > 0 then |
| self.xid = rsp_header.xid + 1 |
| local get_children_response = proto.get_children_response:unpack(bytes, end_index) |
| return { |
| xid = rsp_header.xid, |
| zxid = rsp_header.zxid, |
| path = get_children_response.paths |
| } |
| end |
| if rsp_header.xid == const.XID_PING then |
| goto |
| continue |
| end |
| return nil, "get_children error" |
| end |
| |
| function _M.add_watch(self, path, listener) |
| -- body |
| local d, e = self:_get_children(path, 1) |
| if not d then |
| return d, e |
| end |
| self.watch = true |
| if not self.children_listener[path] then |
| self.children_listener[path] = listener |
| end |
| return d, nil |
| end |
| |
| local function watch_event(self, event) |
| if not event then |
| return |
| end |
| local type = event.type |
| local path = event.paths[1] |
| if type == const.WATCH_NODE_CHILDREN_CHANGE |
| or type == const.WATCH_NODE_CREATED |
| or type == const.WATCH_NODE_DELETED then |
| local listener = self.children_listener[path] |
| if listener then |
| local d, e = self:add_watch(path, listener) |
| if d then |
| listener(d.path) |
| end |
| end |
| end |
| end |
| |
| local function reply_read(self) |
| local conn = self.conn |
| local h = proto.request_header |
| h.xid = const.XID_PING |
| h.type = const.ZOO_PING_OP |
| local req = proto:serialize(h, proto.ping_request) |
| local ok, err = conn:write(req) |
| if ok then |
| local h, bytes, end_start = conn:read_header() |
| if h.xid == const.XID_PING then |
| ngx_log( |
| ngx.DEBUG, |
| "Got ping zookeeper response host:" .. |
| self.host .. " for sessionId:" .. util.long_to_hex_string(self.session_id) |
| ) |
| elseif h.xid == const.XID_WATCH_EVENT then |
| --decoding |
| local data = proto.watch_event:unpack(bytes, end_start) |
| watch_event(self, data) |
| end |
| end |
| return ok, err |
| end |
| |
| function _M.watch_receive(self) |
| local last_time = 0 |
| while true do |
| if exiting() then |
| self.conn.close() |
| return true |
| end |
| local can_ping = now() - last_time > self.ping_time |
| if can_ping then |
| local ok, err = reply_read(self) |
| if err then |
| return nil, err |
| end |
| last_time = now() |
| end |
| sleep(0.2) |
| end |
| end |
| |
| return _M |
