在会话中保存ldapjs客户端

Question

我的Webapp正在从LDAP服务器获取信息。用户需要使用用户名和密码登录到LDAP服务器。我想将LDAP-Client保存在会话中，这样用户每次进行查询时都无需输入密码。

我正在使用express和express-session进行会话处理。我正在使用ldapjs-client https://www.npmjs.com/package/ldapjs-client，这实际上是ldapjs的Promise包装器。我已经使用普通的ldapjs库进行了尝试，但是它也不起作用。

在同一请求中使用已保存的客户端时，它将起作用。但是，如果它是从另一个请求的会话中加载的，则它将不再起作用。

显示以下错误消息：

TypeError: client.search is not a function

我试图将客户端包装在一个对象中并保存该对象，但是它不起作用。

保存客户端的代码：

//Client initialattion.
const LdapClient = require("ldapjs-client");
req.session.client =  new LdapClient({ url: "ldap://Ip-To-Ldap:389" });

await req.session.client.bind(req.body.name, req.body.password);

第一个请求之前的客户端对象：

Client {
  url: 'ldap://Ip-To-Server:389',
  protocol: 'ldap:',
  slashes: true,
  auth: null,
  host: 'Ip-To-Server',
  port: 389,
  hostname: 'Ip-To-Server',
  hash: null,
  query: null,
  pathname: null,
  path: null,
  href: 'ldap://Ip-To-Server:389',
  secure: false,
  _queue: Map {},
  _parser:
   Parser {
     domain: null,
     _events:
      [Object: null prototype] { error: [Function], message: [Function] },
     _eventsCount: 2,
     _maxListeners: undefined,
     buffer: null },
  _socket:
   Socket {
     connecting: false,
     _hadError: false,
     _handle:
      TCP {
        reading: true,
        onread: [Function: onStreamRead],
        onconnection: null,
        [Symbol(owner)]: [Circular] },
     _parent: null,
     _host: 'ldap.zhaw.ch',
     _readableState:
      ReadableState {
        objectMode: false,
        highWaterMark: 16384,
        buffer: BufferList { head: null, tail: null, length: 0 },
        length: 0,
        pipes: null,
        pipesCount: 0,
        flowing: true,
        ended: false,
        endEmitted: false,
        reading: true,
        sync: false,
        needReadable: true,
        emittedReadable: false,
        readableListening: false,
        resumeScheduled: false,
        paused: false,
        emitClose: false,
        autoDestroy: false,
        destroyed: false,
        defaultEncoding: 'utf8',
        awaitDrain: 0,
        readingMore: false,
        decoder: null,
        encoding: null },
     readable: true,
     domain: null,
     _events:
      [Object: null prototype] {
        end: [Function: onReadableStreamEnd],
        close: [Function: destroy],
        error: [Function],
        data: [Function] },
     _eventsCount: 4,
     _maxListeners: undefined,
     _writableState:
      WritableState {
        objectMode: false,
        highWaterMark: 16384,
        finalCalled: false,
        needDrain: false,
        ending: false,
        ended: false,
        finished: false,
        destroyed: false,
        decodeStrings: false,
        defaultEncoding: 'utf8',
        length: 0,
        writing: false,
        corked: 0,
        sync: false,
        bufferProcessing: false,
        onwrite: [Function: bound onwrite],
        writecb: null,
        writelen: 0,
        bufferedRequest: null,
        lastBufferedRequest: null,
        pendingcb: 0,
        prefinished: false,
        errorEmitted: false,
        emitClose: false,
        autoDestroy: false,
        bufferedRequestCount: 0,
        corkedRequestsFree: [Object] },
     writable: true,
     allowHalfOpen: false,
     _sockname: null,
     _pendingData: null,
     _pendingEncoding: '',
     server: null,
     _server: null,
     [Symbol(asyncId)]: 91,
     [Symbol(lastWriteQueueSize)]: 0,
     [Symbol(timeout)]: null,
     [Symbol(kBytesRead)]: 0,
     [Symbol(kBytesWritten)]: 0 } }

在另一个请求中加载后：

{ url: 'ldap://ldap.zhaw.ch:389',
  protocol: 'ldap:',
  slashes: true,
  auth: null,
  host: 'ldap.zhaw.ch',
  port: 389,
  hostname: 'ldap.zhaw.ch',
  hash: null,
  query: null,
  pathname: null,
  path: null,
  href: 'ldap://ldap.zhaw.ch:389',
  secure: false,
  _queue: {},
  _parser: { domain: null, _events: {}, _eventsCount: 2, buffer: null },
  _socket:
   { connecting: false,
     _hadError: false,
     _handle: { reading: true, onconnection: null },
     _parent: null,
     _host: 'ldap.zhaw.ch',
     _readableState:
      { objectMode: false,
        highWaterMark: 16384,
        buffer: [Object],
        length: 0,
        pipes: null,
        pipesCount: 0,
        flowing: true,
        ended: false,
        endEmitted: false,
        reading: true,
        sync: false,
        needReadable: true,
        emittedReadable: false,
        readableListening: false,
        resumeScheduled: false,
        paused: false,
        emitClose: false,
        autoDestroy: false,
        destroyed: false,
        defaultEncoding: 'utf8',
        awaitDrain: 0,
        readingMore: false,
        decoder: null,
        encoding: null },
     readable: true,
     domain: null,
     _events: {},
     _eventsCount: 4,
     _writableState:
      { objectMode: false,
        highWaterMark: 16384,
        finalCalled: false,
        needDrain: false,
        ending: false,
        ended: false,
        finished: false,
        destroyed: false,
        decodeStrings: false,
        defaultEncoding: 'utf8',
        length: 0,
        writing: false,
        corked: 0,
        sync: false,
        bufferProcessing: false,
        writecb: null,
        writelen: 0,
        bufferedRequest: null,
        lastBufferedRequest: null,
        pendingcb: 0,
        prefinished: false,
        errorEmitted: false,
        emitClose: false,
        autoDestroy: false,
        bufferedRequestCount: 0,
        corkedRequestsFree: [Object] },
     writable: true,
     allowHalfOpen: false,
     _sockname: null,
     _pendingData: null,
     _pendingEncoding: '',
     server: null,
     _server: null } }