:doc:`ObjectSummary <index>` / Waiter / wait_until_exists

*****************
wait_until_exists
*****************



.. py:method:: S3.ObjectSummary.wait_until_exists(**kwargs)

  Waits until this ObjectSummary is exists. This method calls :py:meth:`S3.Waiter.object_exists.wait` which polls :py:meth:`S3.Client.head_object` every 5 seconds until a successful state is reached. An error is raised after 20 failed checks.

  See also: `AWS API Documentation <https://docs.aws.amazon.com/goto/WebAPI/s3-2006-03-01/HeadObject>`_  


  **Request Syntax**
  ::

    object_summary.wait_until_exists(
        IfMatch='string',
        IfModifiedSince=datetime(2015, 1, 1),
        IfNoneMatch='string',
        IfUnmodifiedSince=datetime(2015, 1, 1),
        Range='string',
        ResponseCacheControl='string',
        ResponseContentDisposition='string',
        ResponseContentEncoding='string',
        ResponseContentLanguage='string',
        ResponseContentType='string',
        ResponseExpires=datetime(2015, 1, 1),
        VersionId='string',
        SSECustomerAlgorithm='string',
        SSECustomerKey='string',
        RequestPayer='requester',
        PartNumber=123,
        ExpectedBucketOwner='string',
        ChecksumMode='ENABLED'
    )
    
  :type IfMatch: string
  :param IfMatch: 

    Return the object only if its entity tag (ETag) is the same as the one specified; otherwise, return a 412 (precondition failed) error.

     

    If both of the ``If-Match`` and ``If-Unmodified-Since`` headers are present in the request as follows:

     

    
    * ``If-Match`` condition evaluates to ``true``, and;
     
    * ``If-Unmodified-Since`` condition evaluates to ``false``;
    

     

    Then Amazon S3 returns ``200 OK`` and the data requested.

     

    For more information about conditional requests, see `RFC 7232 <https://tools.ietf.org/html/rfc7232>`__.

    

  
  :type IfModifiedSince: datetime
  :param IfModifiedSince: 

    Return the object only if it has been modified since the specified time; otherwise, return a 304 (not modified) error.

     

    If both of the ``If-None-Match`` and ``If-Modified-Since`` headers are present in the request as follows:

     

    
    * ``If-None-Match`` condition evaluates to ``false``, and;
     
    * ``If-Modified-Since`` condition evaluates to ``true``;
    

     

    Then Amazon S3 returns the ``304 Not Modified`` response code.

     

    For more information about conditional requests, see `RFC 7232 <https://tools.ietf.org/html/rfc7232>`__.

    

  
  :type IfNoneMatch: string
  :param IfNoneMatch: 

    Return the object only if its entity tag (ETag) is different from the one specified; otherwise, return a 304 (not modified) error.

     

    If both of the ``If-None-Match`` and ``If-Modified-Since`` headers are present in the request as follows:

     

    
    * ``If-None-Match`` condition evaluates to ``false``, and;
     
    * ``If-Modified-Since`` condition evaluates to ``true``;
    

     

    Then Amazon S3 returns the ``304 Not Modified`` response code.

     

    For more information about conditional requests, see `RFC 7232 <https://tools.ietf.org/html/rfc7232>`__.

    

  
  :type IfUnmodifiedSince: datetime
  :param IfUnmodifiedSince: 

    Return the object only if it has not been modified since the specified time; otherwise, return a 412 (precondition failed) error.

     

    If both of the ``If-Match`` and ``If-Unmodified-Since`` headers are present in the request as follows:

     

    
    * ``If-Match`` condition evaluates to ``true``, and;
     
    * ``If-Unmodified-Since`` condition evaluates to ``false``;
    

     

    Then Amazon S3 returns ``200 OK`` and the data requested.

     

    For more information about conditional requests, see `RFC 7232 <https://tools.ietf.org/html/rfc7232>`__.

    

  
  :type Range: string
  :param Range: 

    HeadObject returns only the metadata for an object. If the Range is satisfiable, only the ``ContentLength`` is affected in the response. If the Range is not satisfiable, S3 returns a ``416 - Requested Range Not Satisfiable`` error.

    

  
  :type ResponseCacheControl: string
  :param ResponseCacheControl: 

    Sets the ``Cache-Control`` header of the response.

    

  
  :type ResponseContentDisposition: string
  :param ResponseContentDisposition: 

    Sets the ``Content-Disposition`` header of the response.

    

  
  :type ResponseContentEncoding: string
  :param ResponseContentEncoding: 

    Sets the ``Content-Encoding`` header of the response.

    

  
  :type ResponseContentLanguage: string
  :param ResponseContentLanguage: 

    Sets the ``Content-Language`` header of the response.

    

  
  :type ResponseContentType: string
  :param ResponseContentType: 

    Sets the ``Content-Type`` header of the response.

    

  
  :type ResponseExpires: datetime
  :param ResponseExpires: 

    Sets the ``Expires`` header of the response.

    

  
  :type VersionId: string
  :param VersionId: 

    Version ID used to reference a specific version of the object.

     

    .. note::

      

      For directory buckets in this API operation, only the ``null`` value of the version ID is supported.

      

    

  
  :type SSECustomerAlgorithm: string
  :param SSECustomerAlgorithm: 

    Specifies the algorithm to use when encrypting the object (for example, AES256).

     

    .. note::

      

      This functionality is not supported for directory buckets.

      

    

  
  :type SSECustomerKey: string
  :param SSECustomerKey: 

    Specifies the customer-provided encryption key for Amazon S3 to use in encrypting data. This value is used to store the object and then it is discarded; Amazon S3 does not store the encryption key. The key must be appropriate for use with the algorithm specified in the ``x-amz-server-side-encryption-customer-algorithm`` header.

     

    .. note::

      

      This functionality is not supported for directory buckets.

      

    

  
  :type SSECustomerKeyMD5: string
  :param SSECustomerKeyMD5: 

    Specifies the 128-bit MD5 digest of the encryption key according to RFC 1321. Amazon S3 uses this header for a message integrity check to ensure that the encryption key was transmitted without error.

     

    .. note::

      

      This functionality is not supported for directory buckets.

      

        Please note that this parameter is automatically populated if it is not provided. Including this parameter is not required



  
  :type RequestPayer: string
  :param RequestPayer: 

    Confirms that the requester knows that they will be charged for the request. Bucket owners need not specify this parameter in their requests. If either the source or destination S3 bucket has Requester Pays enabled, the requester will pay for the corresponding charges. For information about downloading objects from Requester Pays buckets, see `Downloading Objects in Requester Pays Buckets <https://docs.aws.amazon.com/AmazonS3/latest/dev/ObjectsinRequesterPaysBuckets.html>`__ in the *Amazon S3 User Guide*.

     

    .. note::

      

      This functionality is not supported for directory buckets.

      

    

  
  :type PartNumber: integer
  :param PartNumber: 

    Part number of the object being read. This is a positive integer between 1 and 10,000. Effectively performs a 'ranged' HEAD request for the part specified. Useful querying about the size of the part and the number of parts in this object.

    

  
  :type ExpectedBucketOwner: string
  :param ExpectedBucketOwner: 

    The account ID of the expected bucket owner. If the account ID that you provide does not match the actual owner of the bucket, the request fails with the HTTP status code ``403 Forbidden`` (access denied).

    

  
  :type ChecksumMode: string
  :param ChecksumMode: 

    To retrieve the checksum, this parameter must be enabled.

     

    **General purpose buckets** - If you enable checksum mode and the object is uploaded with a `checksum <https://docs.aws.amazon.com/AmazonS3/latest/API/API_Checksum.html>`__ and encrypted with an Key Management Service (KMS) key, you must have permission to use the ``kms:Decrypt`` action to retrieve the checksum.

     

    **Directory buckets** - If you enable ``ChecksumMode`` and the object is encrypted with Amazon Web Services Key Management Service (Amazon Web Services KMS), you must also have the ``kms:GenerateDataKey`` and ``kms:Decrypt`` permissions in IAM identity-based policies and KMS key policies for the KMS key to retrieve the checksum of the object.

    

  
  :returns: None