使用 pysftp 将存储桶文件发送到 FTP 服务器

Question

我正在尝试使用 pysftp 将文件从存储桶发送到 FTP 服务器。

为此，我在 python 3.7 中使用 Google 云函数

我尝试了很多不同的方法，但总是出错。

1.- Downloading the file as string：在这个例子中，为了避免文件内容出错，我将创建一个包含“测试字符串”的文件，而不是使用存储桶文件中的内容

def sftp_handler():
    myHostname = "hotsname.com"
    myUsername = "username"
    myPassword = "pass"
    try:
        keydata = b"""AAAAB..."""
        key = paramiko.RSAKey(data=decodebytes(keydata))
        cnopts = pysftp.CnOpts()
        cnopts.hostkeys.add('hotname.com', 'ssh-rsa', key)
        with pysftp.Connection(host=myHostname, username=myUsername, password=myPassword,port=22,cnopts=cnopts) as sftp:
            print ("Connection succesfully stablished ... ")
            remoteFilePath = '/dir1/dir2/dir3/'
            sftp.putfo(StringIO('test string'), os.path.join(remoteFilePath, "OC.csv"))            
        # connection closed automatically at the end of the with-block
    except:
        print("Unexpected error in sftp_handler:")
        traceback.print_exc()

错误输出（stackdriver log）

Traceback (most recent call last): E    undefined
File "/user_code/main.py", line 36, in sftp_handler E  
sftp.putfo(StringIO('xml string'), os.path.join(remoteFilePath, "OC.csv")) E  
File "/env/local/lib/python3.7/site-packages/pysftp/__init__.py", line 474, in putfo E  
callback=callback, confirm=confirm) E  
File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 714, in putfo E  
with self.file(remotepath, "wb") as fr: E  
File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 372, in open E  
t, msg = self._request(CMD_OPEN, filename, imode, attrblock) E  
File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 813, in _request E  
return self._read_response(num) E  
File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 865, in _read_response E  
self._convert_status(msg) E 
File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 898, in _convert_status E  
raise IOError(text) 
 OSError E  

2.- Using a temp file 我将从桶中写入文件的内容

<adding this to the previous code>
with tempfile.NamedTemporaryFile(suffix='.csv', prefix=os.path.basename(__file__)) as tf:
      tf.write(b'Hello world!')
      remoteFilePath = '/dir1/dir2/dir3/'
      sftp.put(os.path.dirname(tf.name), os.path.join(remoteFilePath, "OC.csv"))

错误日志：

 Traceback (most recent call last): E  
   File "/user_code/main.py", line 40, in sftp_handler E  
     sftp.put(os.path.dirname(tf.name), os.path.join(remoteFilePath, "OC.csv")) E  
   File "/env/local/lib/python3.7/site-packages/pysftp/__init__.py", line 364, in put E  
     confirm=confirm) E  
   File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 758, in put E  
     with open(localpath, "rb") as fl: E  
 IsADirectoryError: [Errno 21] Is a directory: '/tmp' E  

3.- 正如马丁在回答中建议的那样：

    with pysftp.Connection(host=myHostname, username=myUsername, password=myPassword,port=22,cnopts=cnopts) as sftp:
        print ("Connection succesfully stablished ... ")
        remoteFilePath = '/dir1/dir2/dir3/'
        sftp.putfo(StringIO('test string'), remoteFilePath + "OC.csv")

我收到以下错误：

 Traceback (most recent call last): E  
   File "/user_code/main.py", line 36, in sftp_handler E  
     sftp.putfo(StringIO('test string'), remoteFilePath + "OC.csv") E  
   File "/env/local/lib/python3.7/site-packages/pysftp/__init__.py", line 474, in putfo E  
     callback=callback, confirm=confirm) E  
   File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 714, in putfo E  
     with self.file(remotepath, "wb") as fr: E  
   File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 372, in open E  
     t, msg = self._request(CMD_OPEN, filename, imode, attrblock) E  
   File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 813, in _request E  
     return self._read_response(num) E  
   File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 865, in _read_response E  
     self._convert_status(msg) E  
   File "/env/local/lib/python3.7/site-packages/paramiko/sftp_client.py", line 898, in _convert_status E  
     raise IOError(text) E  
 OSError E 

4.- 从存储桶下载文件，在执行云函数时创建一个文件并将此文件发送到 sftp（尚未实现，因为我不确定它是否可以在云函数中创建文件）

---

1. 我怎么能做到这一点？
2. 为什么会失败？

---

注意：我也尝试过使用 FileZilla，但我也有错误，所以这应该与 FTP 服务器有关：

09:00:46    Status: Connecting to sftp-staging.messagesnetwork.com...
09:01:06    Status: Connected to sftp-staging.messagesnetwork.com
09:01:06    Status: Retrieving directory listing...
09:01:06    Status: Listing directory /
09:01:07    Status: Directory listing of "/" successful
09:01:11    Status: Retrieving directory listing of "/folder1"...
09:01:37    Command:    cd "folder1"
09:01:37    Response:   New directory is: "/folder1"
09:01:37    Command:    ls
09:01:37    Error:  Connection timed out after 20 seconds of inactivity
09:01:38    Error:  Failed to retrieve directory listing
09:01:38    Status: Disconnected from server
09:01:38    Status: Connecting to sftp-staging.messagesnetwork.com...
09:02:04    Status: Connected to sftp-staging.messagesnetwork.com
09:02:09    Status: Retrieving directory listing of "/folder1"...
09:02:10    Status: Listing directory /folder1
09:02:10    Status: Directory listing of "/folder1" successful
09:02:12    Status: Retrieving directory listing of "/folder1/folder2"...
09:02:21    Status: Listing directory /folder1/folder2
09:02:23    Status: Directory listing of "/folder1/folder2" successful
09:02:24    Status: Retrieving directory listing of "/folder1/folder2/folder3"...
09:02:25    Status: Listing directory /folder1/folder2/folder3
09:02:26    Status: Directory listing of "/folder1/folder2/folder3" successful
09:02:30    Status: Connecting to sftp-staging.messagesnetwork.com...
09:02:41    Status: Connected to sftp-staging.messagesnetwork.com
09:02:45    Status: Starting upload of <...>\Desktop\folder2cf.txt
09:02:59    Command:    cd "/folder1/folder2/folder3"
09:02:59    Response:   New directory is: "/folder1/folder2/folder3"
09:02:59    Command:    put "<...>\Desktop\folder2cf.txt" "folder2cf.txt"
09:02:59    Error:  /folder1/folder2/folder3/folder2cf.txt: open for write: failure
09:02:59    Error:  File transfer failed
09:02:59    Status: Starting upload of <...>\Desktop\folder2cf.txt
09:02:59    Status: Retrieving directory listing of "/folder1/folder2/folder3"...
09:02:59    Status: Listing directory /folder1/folder2/folder3
09:03:11    Command:    put "<...>\Desktop\folder2cf.txt" "folder2cf.txt"
09:03:11    Error:  /folder1/folder2/folder3/folder2cf.txt: open for write: failure
09:03:11    Error:  File transfer failed
09:03:11    Status: Starting upload of <...>\Desktop\folder2cf.txt
09:03:11    Status: Retrieving directory listing of "/folder1/folder2/folder3"...
09:03:11    Status: Listing directory /folder1/folder2/folder3
09:03:34    Command:    put "<...>\Desktop\folder2cf.txt" "folder2cf.txt"
09:03:34    Error:  /folder1/folder2/folder3/folder2cf.txt: open for write: failure
09:03:34    Error:  File transfer failed
09:03:34    Status: Retrieving directory listing of "/folder1/folder2/folder3"...
09:03:39    Status: Listing directory /folder1/folder2/folder3
09:03:44    Status: Directory listing of "/folder1/folder2/folder3" successful

Answer 1

sftp.putfo(StringIO('test string'), os.path.join(remoteFilePath, "OC.csv"))

我不能说 atm，如果这是真正的问题，但您不应该将 path.join 用于 SFTP 路径。 SFTP 始终使用正斜杠。 path.join 使用本地操作系统的分隔符。它可能会有所不同（尤其是在 Windows 上）。

代码应该是：

remoteFilePath = '/dir1/dir2/dir3/'
sftp.putfo(StringIO('test string'), remoteFilePath + "OC.csv")

---

sftp.put(os.path.dirname(tf.name), os.path.join(remoteFilePath, "OC.csv"))

在这里使用path.dirname 非常有意义。您要上传文件，因此您必须提供要上传的文件的路径，而不是其所在文件夹的路径。

path.join 也存在与之前相同的问题。