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SSH/SCP/SFTP protocol support #58

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SSH/SCP/SFTP protocol support #58

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545625d
Merge pull request #1 from piskvorky/master
val314159 Jan 19, 2016
2a9a8ab
first cut at ssh
Jan 20, 2016
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24 changes: 24 additions & 0 deletions smart_open/smart_open_lib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@
S3_MIN_PART_SIZE = 50 * 1024**2 # minimum part size for S3 multipart uploads
WEBHDFS_MIN_PART_SIZE = 50 * 1024**2 # minimum part size for HDFS multipart uploads

_SSH={} # place to put ssh connections, if necessary.

def smart_open(uri, mode="rb", **kw):
"""
Expand Down Expand Up @@ -117,6 +118,24 @@ def smart_open(uri, mode="rb", **kw):
# local files -- both read & write supported
# compression, if any, is determined by the filename extension (.gz, .bz2)
return file_smart_open(parsed_uri.uri_path, mode)

elif parsed_uri.scheme in ("ssh", "scp", "sftp"):
def SSH(hostname, username):
import paramiko
ssh = _SSH.get( (hostname,username) )
if ssh is None:
ssh = _SSH[ (hostname,username) ] = paramiko.client.SSHClient()
ssh.load_system_host_keys()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(hostname, 22, username)
pass
return ssh
def SFTP(): return SSH(parsed_uri.host,
parsed_uri.user).get_transport().open_sftp_client()
def sopen(filename, mode): return SFTP().open(filename, mode)

return sopen(parsed_uri.uri_path[1:], mode)

elif parsed_uri.scheme in ("s3", "s3n"):
s3_connection = boto.connect_s3(aws_access_key_id=parsed_uri.access_id, aws_secret_access_key=parsed_uri.access_secret)
bucket = s3_connection.get_bucket(parsed_uri.bucket_id)
Expand Down Expand Up @@ -177,6 +196,8 @@ class ParseUri(object):
* ./local/path/file.gz
* file:///home/user/file
* file:///home/user/file.bz2
* [ssh|scp|sftp]://username@host//path/file
* [ssh|scp|sftp]://username@host/path/file

"""
def __init__(self, uri, default_scheme="file"):
Expand All @@ -198,6 +219,9 @@ def __init__(self, uri, default_scheme="file"):

if not self.uri_path:
raise RuntimeError("invalid HDFS URI: %s" % uri)
elif self.scheme in ("ssh", "scp", "sftp"):
self.user, self.host = parsed_uri.netloc.split('@')
self.uri_path = parsed_uri.path
elif self.scheme == "webhdfs":
self.uri_path = parsed_uri.netloc + "/webhdfs/v1" + parsed_uri.path

Expand Down