ReceiveMessage (smaws-clients.Smaws_Client

val request : 
  Smaws_Lib.Context.t ->
  receive_message_request ->
  (receive_message_result,
    [> Smaws_Lib.Protocols.AwsJson.error
    | `InvalidAddress of invalid_address
    | `InvalidSecurity of invalid_security
    | `KmsAccessDenied of kms_access_denied
    | `KmsDisabled of kms_disabled
    | `KmsInvalidKeyUsage of kms_invalid_key_usage
    | `KmsInvalidState of kms_invalid_state
    | `KmsNotFound of kms_not_found
    | `KmsOptInRequired of kms_opt_in_required
    | `KmsThrottled of kms_throttled
    | `OverLimit of over_limit
    | `QueueDoesNotExist of queue_does_not_exist
    | `RequestThrottled of request_throttled
    | `UnsupportedOperation of unsupported_operation ])
    Stdlib.result

Retrieves one or more messages (up to 10), from the specified queue. Using the WaitTimeSeconds parameter enables long-poll support. For more information, see Amazon SQS Long Polling in the Amazon SQS Developer Guide.

Short poll is the default behavior where a weighted random set of machines is sampled on a ReceiveMessage call. Thus, only the messages on the sampled machines are returned. If the number of messages in the queue is small (fewer than 1,000), you most likely get fewer messages than you requested per ReceiveMessage call. If the number of messages in the queue is extremely small, you might not receive any messages in a particular ReceiveMessage response. If this happens, repeat the request.

For each message returned, the response includes the following:

The message body.
An MD5 digest of the message body. For information about MD5, see RFC1321.
The MessageId you received when you sent the message to the queue.
The receipt handle.
The message attributes.
An MD5 digest of the message attributes.

The receipt handle is the identifier you must provide when deleting the message. For more information, see Queue and Message Identifiers in the Amazon SQS Developer Guide.

You can provide the VisibilityTimeout parameter in your request. The parameter is applied to the messages that Amazon SQS returns in the response. If you don't include the parameter, the overall visibility timeout for the queue is used for the returned messages. For more information, see Visibility Timeout in the Amazon SQS Developer Guide.

A message that isn't deleted or a message whose visibility isn't extended before the visibility timeout expires counts as a failed receive. Depending on the configuration of the queue, the message might be sent to the dead-letter queue.

In the future, new attributes might be added. If you write code that calls this action, we recommend that you structure your code so that it can handle new attributes gracefully.