1
通过mscdex使用nodejs ssh2库,我有一个sftp“fetch”节点脚本,它将列出ssh服务器目录的内容,搜索特定文件,然后下载它们。当脚本进入下载步骤并调用“sftp.fastGet”时,提供给fastGet的回调将不会被调用。NodeJS ssh2 fastGet在解压缩时挂起
我已经在ssh连接选项中打开了“DEBUG”设置。看起来像sftp.fastGet正在执行,但挂在“解压缩”步骤。这是我得到的输出:
...
DEBUG: Parser: Verifying MAC
DEBUG: Parser: IN_PACKETDATAVERIFY (Valid HMAC)
DEBUG: Parser: Decompressing
// hangs here forever (or until timeout)...
更奇怪的是,几个数据包似乎过来,并正确解压缩。这里是(更详细)的调试:
info: Fetching xxx from /xxx/xxx/xxx to X:\xxx\xxx\xxx
debug: DEBUG[SFTP]: Outgoing: Writing OPEN
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG: Parser: IN_PACKET
debug: DEBUG: Parser: Decrypting
debug: DEBUG: Parser: pktLen:20,padLen:5,remainLen:16
debug: DEBUG: Parser: IN_PACKETDATA
debug: DEBUG: Parser: Decrypting
debug: DEBUG: Parser: HMAC size:20
debug: DEBUG: Parser: IN_PACKETDATAVERIFY
debug: DEBUG: Parser: Verifying MAC
debug: DEBUG: Parser: IN_PACKETDATAVERIFY (Valid HMAC)
debug: DEBUG: Parser: Decompressing
// doesn't seem to hang here
debug: DEBUG: Parser: IN_PACKETDATAAFTER, packet: CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Parser: Response: HANDLE
debug: DEBUG[SFTP]: Outgoing: Writing FSTAT
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG: Parser: IN_PACKETBEFORE (expecting 8)
debug: DEBUG: Parser: IN_PACKET
debug: DEBUG: Parser: Decrypting
debug: DEBUG: Parser: pktLen:28,padLen:10,remainLen:24
debug: DEBUG: Parser: IN_PACKETDATA
debug: DEBUG: Parser: Decrypting
debug: DEBUG: Parser: HMAC size:20
debug: DEBUG: Parser: IN_PACKETDATAVERIFY
debug: DEBUG: Parser: Verifying MAC
debug: DEBUG: Parser: IN_PACKETDATAVERIFY (Valid HMAC)
debug: DEBUG: Parser: Decompressing
// doesn't seem to hang here
debug: DEBUG: Parser: IN_PACKETDATAAFTER, packet: CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Parser: Response: ATTRS
debug: DEBUG: Parser: IN_PACKETBEFORE (expecting 8)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG[SFTP]: Outgoing: Writing READ
debug: DEBUG: Outgoing: Writing CHANNEL_DATA (0)
debug: DEBUG: Parser: IN_PACKET
debug: DEBUG: Parser: Decrypting
debug: DEBUG: Parser: pktLen:2388,padLen:6,remainLen:2384
debug: DEBUG: Parser: IN_PACKETDATA
debug: DEBUG: Parser: Decrypting
debug: DEBUG: Parser: HMAC size:20
debug: DEBUG: Parser: IN_PACKETDATAVERIFY
debug: DEBUG: Parser: Verifying MAC
debug: DEBUG: Parser: IN_PACKETDATAVERIFY (Valid HMAC)
debug: DEBUG: Parser: Decompressing
// hangs here forever...
我裂了开来 “[我的项目] \ node_modules \ SSH2流\ LIB \ ssh.js”,发现 “decompress.instance.flush” 方法回调并没有每次都被调用。
ssh.js line 544: ...
} else if (instate.status === IN_PACKETDATAAFTER) {
if (decompress.instance) {
if (!decomp) {
debug('DEBUG: Parser: Decompressing');
decompress.instance.write(instate.payload);
// this function executes and calls the method below
decompress.instance.flush(Z_PARTIAL_FLUSH, function(){
// this callback function is called during the first two iterations,
// but is not called the last time, when the process hangs
instate.payload = decompress.instance.read();
var nextSlice;
if (i === chlen)
nextSlice = EMPTY_BUFFER;
else
nextSlice = chunk.slice(i);
self._transform(nextSlice, encoding, callback, true);
});
return;
} else {
...
...当然,这里是我运行
var sshClient = require('ssh2').Client;
var client = new sshClient();
client.on('ready',()=> {
client.sftp((sftpErr, sftp) => {
sftp.readdir(remotepath, (dirErr, files) => {
var validFiles = files.filter((file) => {
return file.filename.match(regex);
});
async.eachSeries(validFiles, (ftpFile, cb) => {
var remote = remotepath + ftpFile.filename;
var local = path.join(localpath, ftpFile.filename);
console.log('Fetching ' + ftpFile.filename + ' from ' + remote + ' to ' + local);
sftp.fastGet(remote, local, (getErr) => {
console.log('Fast Get Complete');
// this is never called
});
});
})
});
});
client.connect({
host: "xxx.xxx.xxx.xxx",
port: 22,
username: "someuser",
password: "somepass",
debug: console.log,
algorithms: {
key: [
"diffie-hellman-group1-sha1",
],
cipher: [
"blowfish-cbc",
"3des-cbc"
],
compress: [
"zlib"
],
hmac: [
"hmac-sha1",
"hmac-md5"
]
}
});
这解决了一切。非常感谢! – BitReiver