Chapter 2. Using XML-RPC with the Red Hat Satellite API

XML-RPC uses HTTP to send an XML-encoded request to a server. The request contains the following:

Namespace: A namespace is a grouping of methods based upon a particular function, object or resource. For example, the auth namespace groups authentication function, or the errata namespace groups function that control errata.
Method: A method represents a certain action. Each method controls a specific function of the Red Hat Satellite. For example, the login method in the auth namespace logs a user into Red Hat Satellite and returns a session key.
Parameter: A parameter is a piece of input to control specific aspects of a method. For example, the login method in the auth namespace requires username and password parameters to specify the login details of a certain user. The login method also accepts an optional duration parameter to specify the length of time until the user session expires..

The XML-encoded request usually appears in the following structure:

<methodCall>
  <methodName>namespace.method</methodName>
  <params>
    <param>
      <value><name>parameter</name></value>
    </param>
    <param>
      <value><name>parameter</name></value>
    </param>
    ...
  </params>
</methodCall>

<methodCall>
  <methodName>namespace.method</methodName>
  <params>
    <param>
      <value><name>parameter</name></value>
    </param>
    <param>
      <value><name>parameter</name></value>
    </param>
    ...
  </params>
</methodCall>

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For example, use the following XML-RPC request to retrieve a list of all Red Hat Satellite API namespaces:

<methodCall>
  <methodName>auth.login</methodName>
  <params>
    <param>
      <value><username>admin</username></value>
    </param>
    <param>
      <value><password>p@55w0rd!</password></value>
    </param>
  </params>
</methodCall>

<methodCall>
  <methodName>auth.login</methodName>
  <params>
    <param>
      <value><username>admin</username></value>
    </param>
    <param>
      <value><password>p@55w0rd!</password></value>
    </param>
  </params>
</methodCall>

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In this example, the request sends the username and password as a parameters to the login method, which is a part of the auth namespace. The Satellite server returns the following response:

<methodResponse>
  <params>
    <param>
      <value><sessionKey>83d8b35f</sessionKey></value>
    </param>
  </params>
</methodResponse>

<methodResponse>
  <params>
    <param>
      <value><sessionKey>83d8b35f</sessionKey></value>
    </param>
  </params>
</methodResponse>

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The response contains a returned parameter for sessionKey, which is a key used to authenticate most of the API methods.

Most programming languages include XML-RPC modules and libraries that automatically parse the desired method and parameters into the XML-encoded request and parse the resulting response as returned variable. For examples, see Part II, “Examples”.

For more information about XML-RPC, see http://www.xmlrpc.com/.

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Chapter 2. Using XML-RPC with the Red Hat Satellite API

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