sxclient 0.9.0

Python SX client-side library

Introduction

sxclient is a library which implements client-side methods for communicating with an SX Cluster. Using the provided objects and functions, it is possible to prepare and send a query as per the API documentation at http://docs.skylable.com/.

Internally, sxclient uses requests library (http://python-requests.org/) and currently requires Python 2.7.

Usage

In order to run an operation provided by the library, you have to perform some preparatory actions:

• prepare a Cluster object, containing cluster location data;

• prepare a UserData object, containing user credentials used to authorize operations;

• prepare either a ClusterSession object or SXClient object which serves as a context for the connections with the cluster.

Afterwards, you can run a series of operations using the previously created ClusterSession object as a context.

Initializing Cluster object

The most basic way of initializing the Cluster object is to pass the cluster name:

cluster = sxclient.Cluster('my.cluster.example.com')

If the passed name is not a FQDN, you should pass an IP address too. It will be used to communicate with the cluster in place of name.

cluster = sxclient.Cluster('clustername', ip_address='127.0.0.1')

In case you don’t want the connection to be secured by SSL, set is_secure to False:

cluster = sxclient.Cluster('my.cluster.example.com', is_secure=False)

You can also pass a custom port number:

cluster = sxclient.Cluster('my.cluster.example.com', port=8000)

Initializing UserData object

There are multiple initialization methods for UserData. You can provide a path to the key file:

user_data = sxclient.UserData.from_key_path('/path/to/keyfile')

The key itself can be provided too — either encoded in base64:

user_data = sxclient.UserData.from_key('ZP1rHyR0QB6zEvCwYexGl9SF1G143C/D2hG9rEisLL2zJV3kWQvtAwAA')

or in its binary form:

user_data = sxclient.UserData('d\xfdk\x1f$t@\x1e\xb3\x12\xf0\xb0a\xecF\x97\xd4\x85\xd4mx\xdc/\xc3\xda\x11\xbd\xacH\xac,\xbd\xb3%]\xe4Y\x0b\xed\x03\x00\x00')

You can also initialize the object with username and password (and cluster UUID):

user_data = sxclient.UserData.from_userpass_pair('a_user', 'a_password', '10ca10ca-10ca-10ca-10ca-10ca10ca10ca')

Initializing SXController object

After preparing Cluster and UserData objects an SXController object can be created:

sx = sxclient.SXController(cluster, user_data)

In order to use a custom CA certificate for verification, pass a path to CA bundle in verify parameter:

sx = sxclient.SXController(cluster, user_data, verify='/path/to/ca/bundle')

You can then get all available commands from

print sx.available_operations

You can call any operation via

sx.listUsers.call(...)

The return value is a HTTP response object holding the response from SX server. If a command supports JSON format (as most of them use) you can call it directly:

sx.listUsers.json_call(...)

After you are done working with SXController gracefuly close it:

sx.close()

Running an operation

Currently the following operations are available:

createBlocks
createUser
createVolume
deleteFile
deleteVolume
flushUploadedFile
getBlocks
getClusterMetadata
getClusterStatus
getFile
getFileMeta
getNodeStatus
getVolumeACL
initializeAddChunk
initializeFile
listFileRevisions
listFiles
listNodes
listUsers
listVolumes
locateVolume
modifyUser
modifyVolume
removeUser
setClusterMetadata
setVolumeACL
updateVolumeACL
whoAmI

High level operations

Since uploading and downloading files requires some low level knowledge about underlying SX protocol we give helpers to simplify that. For a given SXController if you wish to upload file use:

import os
file_size = os.stat('myfile.txt').st_size
uploader = sxclient.SXFileUploader(sxcontroller)
with open('myfile.txt', 'r') as fo:
   uploader.upload_stream('my-volume', file_size, 'my_new_file_name.txt', fo)

and if you wish to download file use:

downloader = sxclient.SXFileDownloader(sxcontroller)
content = downloader.get_file_content('my-volume', 'my_new_file_name.txt')

For more information regarding usage of a specific objects see its docstring. For example, to see the description for listVolumes, you can use the Python built-in help function:

>>> help(sx.listVolumes)

or pydoc while in the shell:

$ pydoc sx.listVolumes