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Change-Id: I781a6b7203c2e12b484162954abae51a6443bead Reviewed-on: http://gerrit.ent.cloudera.com:8080/3076 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: jenkins
85 lines
3.3 KiB
Python
Executable File
85 lines
3.3 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright (c) 2012 Cloudera, Inc. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# Hdfs access utilities
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from xml.etree.ElementTree import parse
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from pywebhdfs.webhdfs import PyWebHdfsClient, errors, _raise_pywebhdfs_exception
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import getpass
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import types
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import requests, httplib
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class PyWebHdfsClientWithChmod(PyWebHdfsClient):
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def chmod(self, path, permission):
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"""Set the permission of 'path' to 'permission' (specified as an octal string, e.g.
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'775'"""
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uri = self._create_uri(path, "SETPERMISSION", permission=permission)
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response = requests.put(uri, allow_redirects=True)
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if not response.status_code == httplib.OK:
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_raise_pywebhdfs_exception(response.status_code, response.text)
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return True
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def setacl(self, path, acls):
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uri = self._create_uri(path, "SETACL", aclspec=acls)
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response = requests.put(uri, allow_redirects=True)
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if not response.status_code == httplib.OK:
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_raise_pywebhdfs_exception(response.status_code, response.text)
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return True
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def getacl(self, path):
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uri = self._create_uri(path, "GETACLSTATUS")
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response = requests.get(uri, allow_redirects=True)
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if not response.status_code == httplib.OK:
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_raise_pywebhdfs_exception(response.status_code, response.text)
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return response.json()
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class HdfsConfig(object):
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"""Reads an XML configuration file (produced by a mini-cluster) into a dictionary
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accessible via get()"""
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def __init__(self, filename):
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self.conf = {}
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tree = parse(filename)
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for property in tree.getroot().getiterator('property'):
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self.conf[property.find('name').text] = property.find('value').text
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def get(self, key):
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return self.conf.get(key)
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def get_hdfs_client_from_conf(conf):
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"""Returns a new HTTP client for an HDFS cluster using an HdfsConfig object"""
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hostport = conf.get('dfs.namenode.http-address')
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if hostport is None:
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raise Exception("dfs.namenode.http-address not found in config")
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host, port = hostport.split(":")
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return get_hdfs_client(host=host, port=port)
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def __pyweb_hdfs_client_exists(self, path):
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"""The PyWebHdfsClient doesn't provide an API to cleanly detect if a file or directory
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exists. This method is bound to each client that is created so tests can simply call
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hdfs_client.exists('path') and get back a bool.
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"""
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try:
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self.get_file_dir_status(path)
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except errors.FileNotFound:
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return False
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return True
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def get_hdfs_client(host, port, user_name=getpass.getuser()):
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"""Returns a new HTTP client for an HDFS cluster using an explict host:port pair"""
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hdfs_client = PyWebHdfsClientWithChmod(host=host, port=port, user_name=user_name)
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# Bind our "exists" method to hdfs_client.exists
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hdfs_client.exists = types.MethodType(__pyweb_hdfs_client_exists, hdfs_client)
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return hdfs_client
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