How to use Web Services with NMSDK Design Guide Amir Mukeri

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Design Guide
How to use Web Services with NMSDK
Amir Mukeri
July 17, 2012
Table of Contents
1
INTRODUCTION ......................................................................................................................... 3
1.1 WEB SERVICES ...................................................................................................................................... 3
1.2 RELEASES ............................................................................................................................................... 3
1.3 SCOPE OF THIS DOCUMENT ................................................................................................................. 3
2
BUSINESS STATEMENT ............................................................................................................ 4
3
WEB SERVICES AND NMSDK .................................................................................................. 5
3.1 OVERVIEW ............................................................................................................................................. 5
3.2 USE CASES FOR THE WEB SERVICES APIS ....................................................................................... 5
3.2.1 Orchestration Tool ......................................................................................................................... 5
3.2.2 Custom programmatic bindings .............................................................................................. 6
3.2.3 Existing ZAPI client ........................................................................................................................ 6
3.2.4 Unsupported API ............................................................................................................................. 6
3.3 WEB SERVICES SUPPORT IN NMSDK ............................................................................................... 6
3.4 LANGUAGES SUPPORTED BY NMSDK ................................ ERROR! BOOKMARK NOT DEFINED.
3.5 WSDL IN NMSDK ............................................................................................................................... 7
3.5.1 Version Matrix .................................................................................................................................. 7
3.5.2 Example – To generate Java stubs on Windows using Apache CXF ........................ 7
3.6 SOAP ...................................................................................................................................................... 8
3.7 AUTHENTICATION ................................................................................................................................ 8
3.8 ITERATIVE APIS .................................................................................................................................... 9
3.9 OVER-THE-WIRE REQUEST/RESPONSE............................................................................................ 9
3.9.1 Request – SOAP ................................................................................................................................ 9
3.9.2 Response – SOAP ............................................................................................................................. 9
3.10 SAMPLE CODES ................................................................................................................................ 10
3.10.1 HelloDfm.java .............................................................................................................................. 12
3.10.2 StorageService.java ...................................................................................................................20
2
1 Introduction
1.1 Web Services
A Web Service, as defined by the W3C, is a software system designed to support
inter-operable machine-to-machine interaction over a network. It is a standardized
way of integrating web-based applications using XML messages following the SOAP,
using WSDL to describe the service and UDDI to enlist available services. Web
Services allow different applications from different sources to communicate with each
other without time-consuming custom coding. Since all communication is in XML,
Web Services are platform independent and thus are not tied to any one operating
system or programming language.

SOAP (Simple Object Access Protocol) is a lightweight XML-based
messaging protocol used to encode the information in Web Service request
and response messages before sending them over a network. SOAP messages
are independent of any operating system and may be transported using a
variety of Internet protocols including HTTP, SMTP and MIME.

UDDI (Universal Description, Discovery and Integration) is a web-based
distributed directory that enables businesses to list themselves on the Internet
and discover each other, similar to a traditional phone book.

WSDL (Web Services Description Language) is an XML-formatted language
used to describe a Web Service's capabilities as collections of communication
endpoints capable of exchanging messages. WSDL is the language that UDDI
uses.
1.2 Releases
DataFabric Manager 4.0 onwards provides support for the Web Services APIs.
The NMSDK bundles the OnCommand Web Services APIs in the form of a WSDL
file that you can use with any third-party management tool, orchestration tool, or
customer-created tools. You can use the WSDL to develop applications. To obtain
further help to develop Web Service applications, see the Web Services sample codes.
1.3 Scope of this document
By the end of this document, you should be able to:
 Locate WSDL file in NMSDK and extract stubs from WSDL file
 Locate the Web Services sample codes, and understand the Web Services
sample codes HelloDfm and StorageService.
3
2 Business Statement
NetApp exposes APIs in the form of Zephyr APIs, which is NetApp proprietary
standard and thus requires a basic level of learning for any developer to start his
development efforts. Also many third party tools look to integrate with NetApp using
industry standard open interfaces. With big Telco’s and Service Providers embracing
cloud/automation, the need for a standard open interface has been a big ask.
To cater to the above needs NetApp provides industry standard SOAP based support
through NMSDK. One can find an equivalent Web Service API for all DataFabric
Manager server APIs for OnCommand Core package. NMSDK also exposes an
WSDL which can be used with any third party toolkit like gSOAP, Apache Axis,
Apache CXF, Perl SOAP::Lite etc to integrate with NetApp solutions.
4
3 Web Services and NMSDK
3.1 Overview
The OnCommand Web Services APIs expose all DataFabric Manager server APIs
through SOAP. This enables the features like monitoring, provisioning and cloning,
backup and recovery, disaster recovery, and performance monitoring to be transportprotocol-agnostic.
3.2 Use Cases for the Web Services APIs
3.2.1 Orchestration Tool
If you are a storage automation administrator who would like to integrate services
provided by DataFabric Manager Server into an orchestration tool, then you will want
to use the SOAP protocol, because the orchestration tool has built-in SOAP support.
The administrator can enable this in the environment using DataFabric Manager
server Web Services APIs.
 The administrator imports the WSDL into the orchestration tool, and
configures various tasks in a workflow to call DataFabric Manager server
APIs via SOAP.
 The administrator must also configure a username and password to be used for
authentication.
 The administrator executes the new workflow, and the tasks call DataFabric
Manager server APIs via SOAP.
5
3.2.2 Custom programmatic bindings
If you are a storage automation administrator who wants to integrate the DataFabric
Manager server services into various custom scripts, the DataFabric Manager Web
services APIs lets you use third-party tools to generate SOAP bindings from the
WSDL to interact with the custom scripting languages.
A storage automation administrator is integrating services provided by OnCommand
into various custom scripts.
 The administrator uses a third party tool to generate SOAP bindings from the
WSDL for the scripting language.
 The administrator modifies the scripts to use the generated bindings to send
SOAP messages.
 The administrator must also configure a username and password to be used for
authentication.
 The administrator executes the scripts, and the scripts call DataFabric
Manager server APIs via SOAP.
3.2.3 Existing ZAPI client
If you are already a NetApp customer using DataFabric Manager Server with Data
ONTAP API support, then you can upgrade to the DataFabric Manager server SDK
version, providing a new SOAP interface without any interruption to the current Data
ONTAP API support.
 The customer upgrades to the DFM version 4.0 or OnCommand providing a
new SOAP interface.
 The customer's current integration is able to continue using ZAPI.
3.2.4 Unsupported API
If you are already using Web Services APIs and need functionality not provided
by a supported SOAP API.
 The customer coordinates with the account team. The account team
informs the customer that the required functionality is provided via an
unsupported API. The customer is willing to try it. The account team gives
the customer the full WSDL (WSDL containing all APIs regardless of
status), and the customer is able to call the required unsupported API via
SOAP.
Note: no "upgrade" to the DataFabric Manager server server is required to use
the APIs provided by the full WSDL.
3.3 Web Services support in NMSDK

Web Services APIs for DataFabric Manager server that can be used with
various SOAP tool-kits, such as Axis, Apache CXF etc to develop custom
Web Service applications.
Note: Data ONTAP currently does not support Web Services
6

WSDL file for DataFabric Manager server APIs for OnCommand Core
Package.

Basic and Advanced sample codes for DataFabric Manager server Web
Services for OnCommand Core Package support C# and Java Apache CXF
toolkit.
3.4 WSDL in NMSDK
The DataFabric Manager server APIs are supported through the industry standard
SOAP protocol, with the help of Web services APIs. The supported features on the
DataFabric Manager server are made available to all the clients through the WSDL
file containing all the available APIs.
3.4.1 Version Matrix
Version Matrix (below) lists the supported DataFabric Manager APIs for
OnCommand Core Package, for each version of the SDK and link to WSDL file.
You can use the following tables to verify the supported API version for each version
of the SDK:
NetApp Manageability SDK
version
4.1
4.0
1.0
DataFabric Manager server
APIs for OnCommand Core
Package
5.0
4.0
3.8
3.7.1
3.6R1
WSDL for DataFabric Manager
server APIs for OnCommand
Core Package
5.0
4.0
N/A
3.4.2 Example – To generate Java stubs on Windows using Apache CXF
Step 1: Set the environment variables:
 JAVA_HOME - Enter the variable value as the installation path for the
Java Development Kit.
7

CXF_HOME - Enter the value as the installation path for CXF.
Step 2: Run “wsdl2java” executable and provide the location of wsdl file as shown
below.
Step 3: Below is the output of the above command. Java stubs are generated at the
location mentioned below.
3.5 SOAP
SOAP is available over HTTP and HTTPS using the same ports that ZAPI uses (but
different url contexts). Currently the ports are configured with the following
respective dfm options (with their default values listed):


HTTP Port 8088
HTTPS Port 8488
The url context will be /apis/soap/v1. So, if the default port is being used, the full
endpoint for HTTPS would be https://servername:8488/apis/soap/v1. For comparison,
the equivalent ZAPI endpoint is https://servername:8488/apis/XMLrequest.
3.6 Authentication
The SOAP implementation will use HTTP Basic Authentication (with
username/password). This is the same authentication mechanism that ZAPI uses.
8
Starting with OnCommand/DFM version 5.0 Certificate Based Authentication is also
supported.
3.7 Iterative APIs
Iterative APIs allow you to operate on a large set of objects by dividing that set of
objects into manageable sub-sets, repeatedly executing an API call.
To repeatedly call a DFM API, you can use *-iter-start, *-iter-next, and *-iter-end.
3.8 Over-the-wire Request/Response
The following snippets show an example of how the same API is exposed via
SOAP.
3.8.1 Request – SOAP
3.8.2 Response – SOAP
9
3.9 Sample Codes
You can use the Web Services APIs for OnCommand Package to retrieve information
about the DataFabric Manager server version, vFiler units management, usage
metrics, and so on.
The Web services API sample codes can be used with Web Services frameworks
like—Apache CXF and Microsoft .NET.
10
The following list describes sample codes that demonstrate the use of a few Web
Services APIs.
Name
Description
Sample code in
Java
HelloDfm.java
Hello
DataFabric
Manager
MultiStore
management
Sample code in
C#
HelloDfm.cs
Sample code to demonstrate how to get the
version number of the DataFabric Manager server
by using the HTTP or HTTPS protocol.
Sample code to manage vFiler units. You can
Vfiler.java
Vfiler.cs
create and delete vFiler units; and create, list, and
delete vFiler templates.
Usage Metrics Sample code to demonstrate how to compute and UsageMetrics.java UsageMetrics.cs
retrieve space utilization and I/O measurement for
a dataset node.
Storage service Sample code to demonstrate how to manage
StorageService.java
management storage services and provision storage. You can
create a new storage service with backup or mirror
protection policy, list or delete storage service,
provision and de-provision storage, and resize
storage.
11
-
3.9.1 HelloDfm.java
HelloDfm.java is a basic sample code to retrieve the version of DataFabric Manager
server using the Apache CXF Web service Framework. DataFabric Manager 4.0
server Web Services Description Language (WSDL) provides the XML prototype of
the operations supported by DataFabric Manager 4.0 server.
1. The section (below) of WSDL shows the definition of the DfmAbout API
operation. The DfmAbout operation description identifies the valid input and
output structure of the DfmAbout Application Programming Interface (API). So,
the DfmAboutRequest input message needs to be passed along with the
DfmAbout API, at the time of invocation. The DfmAboutResponse message will
be returned if the API invocation is successful. The DfmAbout operation is the
method exposed by the server to enable the DataFabric Manager clients to retrieve
the version of the server.
2. If you navigate through the help document to the Web Services API section, you
can see the API definition for the DfmAbout API. The input and output
parameters of the DfmAbout API are DfmAbout and DfmAboutResult.
12
The DfmAbout element has an optional IncludeDirectorySizeInfo parameter which
returns the size and file count information of the DataFabric Manager directories.
Note: We are not going to use this parameter in the hello dfm sample code to retrieve
the dfm server version.
3. The DfmAboutResult element consists of a list of parameters about the
DataFabric Manager server. We will be using the version parameter in the hello
dfm sample code.
13
4. The DfmAbout XML element in the WSDL file defines the input parameter value
of the DfmAbout API operation.
5. The highlighted section(below) shows the definition of the DfmAboutResult
output message in the WSDL file. This creates a prototype for the output structure
14
The parameters of the output structure CpuCount, DfmDirectories, Hostname, Install
Dir, and so on, are listed in the DfmAboutResult XML element tag.
6.
The version tag is the string value that will be extracted from the DfmAboutResult
output message.
7. This section of the WSDL file defines the input and output message structure in
the DataFabric Manager server WSDL.
15
8. This portion of the WSDL file defines the service tag used by the DataFabric
Manager server to define the service location of the web server.
9. Import the netapp.management package, which contains all the client side stubs.
10. Create HelloDfm class and declare DfmInterface member to invoke the DFM
Web Services APIs. Declare default HTTP port as 8088 and HTTPS port as 8488
for DataFabric Manager server communication.
11. This section of the code creates variables for the command-line arguments,
DataFabric Manager server IP address, user name, and password. The option of
using HTTP or HTTPS as the transport protocol is also initialized in this section.
12. The PrintUsageAndExit function is highlighted. The -s switch is used for selecting
HTTPS as the transport protocol and the -i switch is used to ignore the server
certificate validation process.
16
13. After the user input arguments are validated, create Interface method to create a
client proxy to invoke the web services APIs.
14. Frame the address for SOAP request over HTTP with the given server and port
number.
15. Create an instance of the DFMService and extract the dfmInterface through
getDfmPort method
16. Set the server binding properties like user name, password, and end point address
for the DataFabric Manager server interface.
17. The next function call in the main method is the DfmAbout method.
18. This section shows the creation of an instance of the DfmAbout class defined in
the stub file. You can invoke the DfmAbout API through the dfmInterface
instance and assign the output of the API invocation to the instance of the
DfmAboutResult class.
19. You can extract the version from the DfmAboutResult instance. The extracted
version is printed on the console.
17
20. In the HelloDfm sample code, when the DfmAbout API is invoked, the API call is
redirected to this stub code.
21. The parameters of the DfmAboutResult API are also defined in the DfmService
stub class.
22. From the command prompt, CD to the sample code folder:
WebServices>CXF>basic set the CXF_HOME and JAVA_HOME environment
variables to the folder where apache-CXF and JDK is installed. Run MAKE.BAT
to generate and compile the client side stubs. MAKE.BAT also compiles
HelloDfm sample code. Run "TEST.BAT HelloDfm" to list the usage of the
sample code.
23. Run TEST.BAT HelloDfm with the DataFabric Manager server IP address,
administrator username, and password. This displays the version of the
DataFabric Manager server.
18
24. To use the HTTPS transport protocol, run the code and include the -s switch
operator. Use -i switch to ignore the server certification.
25. Sample output:
19
3.9.2 StorageService.java
This sample code demonstrates how to manage storage services and provision storage
using storage service. A storage service contains one or more resource pools, one or
more provisioning policies and a protection policy. The service abstracts the physical
resources and policies from the subscriber.
1. Import the netapp.management package, which contains all the client side stubs.
2. Create StorageService class and declare DfmInterface member to invoke the
OnCommand Web Services APIs. Declare default HTTP port as 8088 for
DataFabric Manager server communication.
3. Extract the DataFabric Manager server, user name and password information from
the command line arguments.
4. Call the create Interface method to create a client proxy to invoke the Web
Services APIs.
20
5. Frame the address for SOAP request over HTTP with the given server and port
number.
6. Create an instance of the DFMService and extract the dfmInterface through
getDfmPort method
7. Set the server binding properties like user name, password, and end point address
for the DataFabric Manager server interface.
8. After creating the dfmInterface, parse the command line arguments given by the
user.
9. createService method creates a storage service. This method requires the name of
the service, name of the protection policy, provisioning policy and resource pool
name attributes for primary and secondary nodes. This method will internally
invoke storageServiceCreate Web Service API to create a new storage service.
10. Create an instance of StorageServiceCreate and set the name of the new service
and the protection policy.
21
11. Set the node name and resource pools node attributes for the primary node.
12. After setting the node name and resource pool attributes for the primary node, set
the node name and resource pools attributes for the secondary node. The
secondary node name can be either a Backup node or Mirror node.
13. Invoke the storageServiceCreate API to create a storage service. This API will
return StorageService Create Result instance, which contains the ID of the new
storage service.
14. The listService method will list information of all storage services on the
DataFabric Manager server.
22
15. Create an instance of StorageServiceListInfoIterStart and set the name of the
service.
16. Invoke the storageServiceListInfoIterStart Web Service API to start the iteration
to list storage services. This API will return the ServiceListInfoIterStartResult
structure, which will contain the tag and record values for the
storageServiceListInfoIterNext API.
17. Create an instance of the StorageServiceListInfoIterNext API and set the
maximum number of records to retrieve and the tag value from the
storageServiceListInfoIterStart API.
18. Invoke the storageServiceListInfoIterNext API to return a list of storage service
records.
19. Iterate through each storage service information record
20. Extract the name of the storage service and protection policy.
21. Extract the information about storage service nodes from the storage service info
object.
22. Iterate through each node in the storage service and list the node name,
provisioning policy name and resource pool node attributes.
23
23. Extract and list the datasets attached to the storage service.
24. The provision Storage method will provision the storage with specified size and
exports the storage over CIFS protocol. Provision the storage using
storageServiceDatasetProvision API. This will create a new dataset with the
specified storage service. Set the provisioning request with the specified name and
size of the storage container while creating the new dataset.
25. Create an instance of StorageServiceDatasetProvision and set the dataset name
and service name.
26. Create an instance of ProvisionMemberRequestInfo API and set the storage
24
container name and the size attributes.
27. Set the provision member request info.
28. Create an instance of DatasetExportInfo API and set the export protocol to CIFS.
Set the CIFS share permissions to "full control" for "everyone"
29. Invoke the storageServiceDatasetProvision API request to provision storage. This
API will return the Provision Result structure, which contains the ID of the newly
provisioned Dataset.
30. From the command prompt, CD to the sample code folder:
WebServices>CXF>advanced set the CXF_HOME and JAVA_HOME
environment variables to the folder where apache-CXFand JDK is installed. Run
MAKE.BAT to generate and compile the client side stubs. Run "TEST.BAT
StorageService" to list the usage of the sample code.
25
31. Create a Gold storage service with mirror protection policy.
32. List the storage services and the details of the protection policy and node
attributes.
33. Provision 100 GB of storage for finance department under gold storage service.
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