Node.js NET连接分块XML数据

我通过节点中的网络套接字接收XML/SOAP。较大的SOAP响应是分块的，因此我需要在将SOAP信封传递给XML解析器之前将其连接起来

以下是迄今为止的尝试

//client.net.setEncoding('utf8');
var data = '';
client.net.on('data', function(response) {
    var read = response.toString();
    console.log("READING == "+read);
    if (read.substr(read.length-15) === "</env:Envelope>") {
        if(data.length > 0) {
            /* soap envelope is finally complete, pass to xml parser */
            parser.parseString(data += response);
            data = '';
        }
        /* soap envelope is complete, pass to xml parser */
        parser.parseString(response);
    } else {
        /* not soap response */
        if (read.substr(0, 4) === "HTTP") return;
        /* add chunck to data */
        data += response;
    }
});

编辑-进一步信息

这段代码给出了错误，但传递了相同的响应

client.net.on('data', function(response) {
    var read = response.toString();
    if (read.substr(read.length-15) === "</env:Envelope>") {
        parser.parseString(response);
        return;
    }
}

完全错误：

2015-11-13T19:34:50.355Z - error: uncaughtException: Text data outside of root node.
Line: 0
Column: 1228
Char: H date=Fri Nov 13 2015 19:34:50 GMT+0000 (GMT Standard Time), pid=25712, uid=null, gid=null, cwd=C:\Users\v_lowe\Dropbox\nodejs\v4 -of
, execPath=C:\Program Files\nodejs\node.exe, version=v4.1.1, argv=[C:\Program Files\nodejs\node.exe, C:\Users\v_lowe\Dropbox\nodejs\v4 -of\i
ndex.js], rss=44589056, heapTotal=34005760, heapUsed=21471184, loadavg=[0, 0, 0], uptime=954829.8959002, trace=[column=10, file=-of\node_mod
ules\xml2js\node_modules\sax\lib\sax.js, function=error (C:\Users\v_lowe\Dropbox\nodejs\v4, line=666, method=null, native=false, column=7, f
ile=-of\node_modules\xml2js\node_modules\sax\lib\sax.js, function=strictFail (C:\Users\v_lowe\Dropbox\nodejs\v4, line=692, method=null, nati
ve=false, column=15, file=-of\node_modules\xml2js\node_modules\sax\lib\sax.js, function=Object.write (C:\Users\v_lowe\Dropbox\nodejs\v4, lin
e=1035, method=write (C:\Users\v_lowe\Dropbox\nodejs\v4, native=false, column=31, file=-of\node_modules\xml2js\lib\xml2js.js, function=Parse
r.exports.Parser.Parser.parseString (C:\Users\v_lowe\Dropbox\nodejs\v4, line=497, method=exports.Parser.Parser.parseString (C:\Users\v_lowe\
Dropbox\nodejs\v4, native=false, column=59, file=-of\node_modules\xml2js\lib\xml2js.js, function=Parser.parseString (C:\Users\v_lowe\Dropbox
\nodejs\v4, line=7, method=parseString (C:\Users\v_lowe\Dropbox\nodejs\v4, native=false, column=12, file=-of\lib\gps_parse.js, function=Sock
et.<anonymous> (C:\Users\v_lowe\Dropbox\nodejs\v4, line=41, method=<anonymous> (C:\Users\v_lowe\Dropbox\nodejs\v4, native=false, column=13,
file=events.js, function=emitOne, line=77, method=null, native=false, column=7, file=events.js, function=Socket.emit, line=169, method=emit,
 native=false, column=16, file=_stream_readable.js, function=readableAddChunk, line=146, method=null, native=false, column=10, file=_stream_
readable.js, function=Socket.Readable.push, line=110, method=Readable.push, native=false], stack=[Error: Text data outside of root node., Li
ne: 0, Column: 1228, Char: H,     at error (C:\Users\v_lowe\Dropbox\nodejs\v4 -of\node_modules\xml2js\node_modules\sax\lib\sax.js:666:10),
   at strictFail (C:\Users\v_lowe\Dropbox\nodejs\v4 -of\node_modules\xml2js\node_modules\sax\lib\sax.js:692:7),     at Object.write (C:\User
s\v_lowe\Dropbox\nodejs\v4 -of\node_modules\xml2js\node_modules\sax\lib\sax.js:1035:15),     at Parser.exports.Parser.Parser.parseString (C:
\Users\v_lowe\Dropbox\nodejs\v4 -of\node_modules\xml2js\lib\xml2js.js:497:31),     at Parser.parseString (C:\Users\v_lowe\Dropbox\nodejs\v4
-of\node_modules\xml2js\lib\xml2js.js:7:59),     at Socket.<anonymous> (C:\Users\v_lowe\Dropbox\nodejs\v4 -of\lib\gps_parse.js:41:12),     a
t emitOne (events.js:77:13),     at Socket.emit (events.js:169:7),     at readableAddChunk (_stream_readable.js:146:16),     at Socket.Reada
ble.push (_stream_readable.js:110:10)]

2015-11-13T19:34:50.355Z-错误：未捕获异常：根节点外部的文本数据。
行：0
栏目：1228
Char:H date=Fri 2015年11月13日19:34:50 GMT+0000（GMT标准时间），pid=25712，uid=null，gid=null，cwd=C:\Users\v_lowe\Dropbox\nodejs\v4-of
，execPath=C:\Program Files\nodejs\node.exe，版本=v4.1.1，argv=[C:\Program Files\nodejs\node.exe，C:\Users\v\u lowe\Dropbox\nodejs\v4-of\i
ndex.js]，rss=44589056，heapTotal=34005760，heapUsed=21471184，loadavg=[0,0,0]，正常运行时间=954829.8959002，trace=[column=10，file=-of\node\u mod
ules\xml2js\node\u modules\sax\lib\sax.js，function=error（C:\Users\v\u lowe\Dropbox\nodejs\v4，line=666，method=null，native=false，column=7，f
ile=-of\node\u modules\xml2js\node\u modules\sax\lib\sax.js，function=strictFail（C:\Users\v\u lowe\Dropbox\nodejs\v4，line=692，method=null，nati）
ve=false，column=15，file=-of\node\u modules\xml2js\node\u modules\sax\lib\sax.js，function=Object.write（C:\Users\v\u lowe\Dropbox\nodejs\v4，lin
e=1035，method=write（C:\Users\v\u lowe\Dropbox\nodejs\v4，native=false，column=31，file=-of\node\u modules\xml2js\lib\xml2js.js，function=Parse
r、 exports.Parser.Parser.parseString（C:\Users\v_lowe\Dropbox\nodejs\v4，行=497，方法=exports.Parser.Parser.parseString（C:\Users\v_lowe\
Dropbox\nodejs\v4，native=false，column=59，file=-of\node\u modules\xml2js\lib\xml2js.js，function=Parser.parseString（C:\Users\v\u lowe\Dropbox
\nodejs\v4，line=7，method=parseString（C:\Users\v\u lowe\Dropbox\nodejs\v4，native=false，column=12，file=-of\lib\gps\u parse.js，function=Sock
等。（C:\Users\v\u lowe\Dropbox\nodejs\v4，行=41，方法=（C:\Users\v\u lowe\Dropbox\nodejs\v4，本机=false，列=13，
file=events.js，function=emitOne，line=77，method=null，native=false，column=7，file=events.js，function=Socket.emit，line=169，method=emit，
native=false，column=16，file=\u stream\u readable.js，function=readableAddChunk，line=146，method=null，native=false，column=10，file=\u stream_
readable.js，function=Socket.readable.push，line=110，method=readable.push，native=false]，stack=[错误：根节点外的文本数据，Li]
ne:0，列：1228，字符：H，出现错误（C:\Users\v_lowe\Dropbox\nodejs\v4-of\node_modules\xml2js\node_modules\sax\lib\sax.js:666:10），
在strictFail（C:\Users\v\u lowe\Dropbox\nodejs\v4-of\node\u modules\xml2js\node\u modules\sax\lib\sax.js:692:7）和Object.write（C:\User
s\v_lowe\Dropbox\nodejs\v4-of\node_modules\xml2js\node_modules\sax\lib\sax.js:1035:15），位于Parser.exports.Parser.parseString（C:
\Users\v_lowe\Dropbox\nodejs\v4-of\node_modules\xml2js\lib\xml2js.js:497:31），位于Parser.parseString（C:\Users\v_lowe\Dropbox\nodejs\v4
-在Socket（C:\Users\v\u lowe\Dropbox\nodejs\v4-of\lib\gps\u parse.js:41:12）中
t emitOne（events.js:77:13）、Socket.emit（events.js:169:7）、readableAddChunk（_stream_readable.js:146:16）、Socket.Reada
ble.push（_stream_readable.js:110:10）]

一种方法是查找结束模式，而不是使用开始模式，基本上：

• 每次接收数据时，在缓冲区中累积数据
• 每次将数据追加到缓冲区时，检查更新的缓冲区中的结束模式
• 只要在缓冲区中找到结束模式：
  • 从开始到第一个结束模式切掉一段，这是你的框架
  • 继续分析/处理该帧。确保将其从缓冲区中删除
  • 如果缓冲区仍然包含结束模式，则继续截断缓冲区，否则让其增长

就这些

var textBuffer = '';
var parseFrame = function (str){};

function processChunk (chunk) {
  var segments, frame;
  var startChar = String.fromCharCode(1);
  var endChar = String.fromCharCode(0);

  // having no endChar will skip the loop,
  // but we still save the chunk
  textBuffer += chunk;

  while (textBuffer && textBuffer.indexOf(endChar) !== -1) {
    // use endChar in lieu of startChar so we don’t
    // miss a chunk without beginning
    segments = textBuffer.split(endChar);

    // first chunk we extract may or may not have a startChar
    // replace() will have no effect if startChar is absent
    frame = segments.shift().replace(startChar, '');

    // if join() results in '', endChar won’t be found,
    // and we will get out of loop
    textBuffer = segments.join(endChar);

    // beware: it is possible that the frame
    // is incomplete if we *never* got the startChar,
    // the next chunks will be OK though
    try { parseFrame(frame); }
    catch (err) { console.log(err); }
  }
}

client.net.on('data', function(response) {
        parser.parseString(response);
        return;
}

2015-11-13T19:34:50.355Z - error: uncaughtException: Text data outside of root node.
Line: 0
Column: 1228
Char: H date=Fri Nov 13 2015 19:34:50 GMT+0000 (GMT Standard Time), pid=25712, uid=null, gid=null, cwd=C:\Users\v_lowe\Dropbox\nodejs\v4 -of
, execPath=C:\Program Files\nodejs\node.exe, version=v4.1.1, argv=[C:\Program Files\nodejs\node.exe, C:\Users\v_lowe\Dropbox\nodejs\v4 -of\i
ndex.js], rss=44589056, heapTotal=34005760, heapUsed=21471184, loadavg=[0, 0, 0], uptime=954829.8959002, trace=[column=10, file=-of\node_mod
ules\xml2js\node_modules\sax\lib\sax.js, function=error (C:\Users\v_lowe\Dropbox\nodejs\v4, line=666, method=null, native=false, column=7, f
ile=-of\node_modules\xml2js\node_modules\sax\lib\sax.js, function=strictFail (C:\Users\v_lowe\Dropbox\nodejs\v4, line=692, method=null, nati
ve=false, column=15, file=-of\node_modules\xml2js\node_modules\sax\lib\sax.js, function=Object.write (C:\Users\v_lowe\Dropbox\nodejs\v4, lin
e=1035, method=write (C:\Users\v_lowe\Dropbox\nodejs\v4, native=false, column=31, file=-of\node_modules\xml2js\lib\xml2js.js, function=Parse
r.exports.Parser.Parser.parseString (C:\Users\v_lowe\Dropbox\nodejs\v4, line=497, method=exports.Parser.Parser.parseString (C:\Users\v_lowe\
Dropbox\nodejs\v4, native=false, column=59, file=-of\node_modules\xml2js\lib\xml2js.js, function=Parser.parseString (C:\Users\v_lowe\Dropbox
\nodejs\v4, line=7, method=parseString (C:\Users\v_lowe\Dropbox\nodejs\v4, native=false, column=12, file=-of\lib\gps_parse.js, function=Sock
et.<anonymous> (C:\Users\v_lowe\Dropbox\nodejs\v4, line=41, method=<anonymous> (C:\Users\v_lowe\Dropbox\nodejs\v4, native=false, column=13,
file=events.js, function=emitOne, line=77, method=null, native=false, column=7, file=events.js, function=Socket.emit, line=169, method=emit,
 native=false, column=16, file=_stream_readable.js, function=readableAddChunk, line=146, method=null, native=false, column=10, file=_stream_
readable.js, function=Socket.Readable.push, line=110, method=Readable.push, native=false], stack=[Error: Text data outside of root node., Li
ne: 0, Column: 1228, Char: H,     at error (C:\Users\v_lowe\Dropbox\nodejs\v4 -of\node_modules\xml2js\node_modules\sax\lib\sax.js:666:10),
   at strictFail (C:\Users\v_lowe\Dropbox\nodejs\v4 -of\node_modules\xml2js\node_modules\sax\lib\sax.js:692:7),     at Object.write (C:\User
s\v_lowe\Dropbox\nodejs\v4 -of\node_modules\xml2js\node_modules\sax\lib\sax.js:1035:15),     at Parser.exports.Parser.Parser.parseString (C:
\Users\v_lowe\Dropbox\nodejs\v4 -of\node_modules\xml2js\lib\xml2js.js:497:31),     at Parser.parseString (C:\Users\v_lowe\Dropbox\nodejs\v4
-of\node_modules\xml2js\lib\xml2js.js:7:59),     at Socket.<anonymous> (C:\Users\v_lowe\Dropbox\nodejs\v4 -of\lib\gps_parse.js:41:12),     a
t emitOne (events.js:77:13),     at Socket.emit (events.js:169:7),     at readableAddChunk (_stream_readable.js:146:16),     at Socket.Reada
ble.push (_stream_readable.js:110:10)]

var textBuffer = '';
var parseFrame = function (str){};

function processChunk (chunk) {
  var segments, frame;
  var startChar = String.fromCharCode(1);
  var endChar = String.fromCharCode(0);

  // having no endChar will skip the loop,
  // but we still save the chunk
  textBuffer += chunk;

  while (textBuffer && textBuffer.indexOf(endChar) !== -1) {
    // use endChar in lieu of startChar so we don’t
    // miss a chunk without beginning
    segments = textBuffer.split(endChar);

    // first chunk we extract may or may not have a startChar
    // replace() will have no effect if startChar is absent
    frame = segments.shift().replace(startChar, '');

    // if join() results in '', endChar won’t be found,
    // and we will get out of loop
    textBuffer = segments.join(endChar);

    // beware: it is possible that the frame
    // is incomplete if we *never* got the startChar,
    // the next chunks will be OK though
    try { parseFrame(frame); }
    catch (err) { console.log(err); }
  }
}