:doc:`CloudFront <../../cloudfront>` / Client / update_function

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update_function
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.. py:method:: CloudFront.Client.update_function(**kwargs)

  

  Updates a CloudFront function.

   

  You can update a function's code or the comment that describes the function. You cannot update a function's name.

   

  To update a function, you provide the function's name and version ( ``ETag`` value) along with the updated function code. To get the name and version, you can use ``ListFunctions`` and ``DescribeFunction``.

  

  See also: `AWS API Documentation <https://docs.aws.amazon.com/goto/WebAPI/cloudfront-2020-05-31/UpdateFunction>`_  


  **Request Syntax**
  ::

    response = client.update_function(
        Name='string',
        IfMatch='string',
        FunctionConfig={
            'Comment': 'string',
            'Runtime': 'cloudfront-js-1.0'|'cloudfront-js-2.0',
            'KeyValueStoreAssociations': {
                'Quantity': 123,
                'Items': [
                    {
                        'KeyValueStoreARN': 'string'
                    },
                ]
            }
        },
        FunctionCode=b'bytes'
    )
    
  :type Name: string
  :param Name: **[REQUIRED]** 

    The name of the function that you are updating.

    

  
  :type IfMatch: string
  :param IfMatch: **[REQUIRED]** 

    The current version ( ``ETag`` value) of the function that you are updating, which you can get using ``DescribeFunction``.

    

  
  :type FunctionConfig: dict
  :param FunctionConfig: **[REQUIRED]** 

    Configuration information about the function.

    

  
    - **Comment** *(string) --* **[REQUIRED]** 

      A comment to describe the function.

      

    
    - **Runtime** *(string) --* **[REQUIRED]** 

      The function's runtime environment version.

      

    
    - **KeyValueStoreAssociations** *(dict) --* 

      The configuration for the key value store associations.

      

    
      - **Quantity** *(integer) --* **[REQUIRED]** 

        The quantity of key value store associations.

        

      
      - **Items** *(list) --* 

        The items of the key value store association.

        

      
        - *(dict) --* 

          The key value store association.

          

        
          - **KeyValueStoreARN** *(string) --* **[REQUIRED]** 

            The Amazon Resource Name (ARN) of the key value store association.

            

          
        
    
    
  
  :type FunctionCode: bytes
  :param FunctionCode: **[REQUIRED]** 

    The function code. For more information about writing a CloudFront function, see `Writing function code for CloudFront Functions <https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/writing-function-code.html>`__ in the *Amazon CloudFront Developer Guide*.

    

  
  
  :rtype: dict
  :returns: 
    
    **Response Syntax**

    
    ::

      {
          'FunctionSummary': {
              'Name': 'string',
              'Status': 'string',
              'FunctionConfig': {
                  'Comment': 'string',
                  'Runtime': 'cloudfront-js-1.0'|'cloudfront-js-2.0',
                  'KeyValueStoreAssociations': {
                      'Quantity': 123,
                      'Items': [
                          {
                              'KeyValueStoreARN': 'string'
                          },
                      ]
                  }
              },
              'FunctionMetadata': {
                  'FunctionARN': 'string',
                  'Stage': 'DEVELOPMENT'|'LIVE',
                  'CreatedTime': datetime(2015, 1, 1),
                  'LastModifiedTime': datetime(2015, 1, 1)
              }
          },
          'ETag': 'string'
      }
      
    **Response Structure**

    

    - *(dict) --* 
      

      - **FunctionSummary** *(dict) --* 

        Contains configuration information and metadata about a CloudFront function.

        
        

        - **Name** *(string) --* 

          The name of the CloudFront function.

          
        

        - **Status** *(string) --* 

          The status of the CloudFront function.

          
        

        - **FunctionConfig** *(dict) --* 

          Contains configuration information about a CloudFront function.

          
          

          - **Comment** *(string) --* 

            A comment to describe the function.

            
          

          - **Runtime** *(string) --* 

            The function's runtime environment version.

            
          

          - **KeyValueStoreAssociations** *(dict) --* 

            The configuration for the key value store associations.

            
            

            - **Quantity** *(integer) --* 

              The quantity of key value store associations.

              
            

            - **Items** *(list) --* 

              The items of the key value store association.

              
              

              - *(dict) --* 

                The key value store association.

                
                

                - **KeyValueStoreARN** *(string) --* 

                  The Amazon Resource Name (ARN) of the key value store association.

                  
            
          
        
      
        

        - **FunctionMetadata** *(dict) --* 

          Contains metadata about a CloudFront function.

          
          

          - **FunctionARN** *(string) --* 

            The Amazon Resource Name (ARN) of the function. The ARN uniquely identifies the function.

            
          

          - **Stage** *(string) --* 

            The stage that the function is in, either ``DEVELOPMENT`` or ``LIVE``.

             

            When a function is in the ``DEVELOPMENT`` stage, you can test the function with ``TestFunction``, and update it with ``UpdateFunction``.

             

            When a function is in the ``LIVE`` stage, you can attach the function to a distribution's cache behavior, using the function's ARN.

            
          

          - **CreatedTime** *(datetime) --* 

            The date and time when the function was created.

            
          

          - **LastModifiedTime** *(datetime) --* 

            The date and time when the function was most recently updated.

            
      
    
      

      - **ETag** *(string) --* 

        The version identifier for the current version of the CloudFront function.

        
  
  **Exceptions**
  
  *   :py:class:`CloudFront.Client.exceptions.PreconditionFailed`

  
  *   :py:class:`CloudFront.Client.exceptions.UnsupportedOperation`

  
  *   :py:class:`CloudFront.Client.exceptions.FunctionSizeLimitExceeded`

  
  *   :py:class:`CloudFront.Client.exceptions.InvalidArgument`

  
  *   :py:class:`CloudFront.Client.exceptions.NoSuchFunctionExists`

  
  *   :py:class:`CloudFront.Client.exceptions.InvalidIfMatchVersion`

  