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Class: Aws::SQS::Client

Inherits:
Seahorse::Client::Base show all
Defined in:
(unknown)

Overview

An API client for Amazon Simple Queue Service. To construct a client, you need to configure a :region and :credentials.

sqs = Aws::SQS::Client.new(
  region: region_name,
  credentials: credentials,
  # ...
)

See #initialize for a full list of supported configuration options.

Region

You can configure a default region in the following locations:

  • ENV['AWS_REGION']
  • Aws.config[:region]

Go here for a list of supported regions.

Credentials

Default credentials are loaded automatically from the following locations:

  • ENV['AWS_ACCESS_KEY_ID'] and ENV['AWS_SECRET_ACCESS_KEY']
  • Aws.config[:credentials]
  • The shared credentials ini file at ~/.aws/credentials (more information)
  • From an instance profile when running on EC2

You can also construct a credentials object from one of the following classes:

Alternatively, you configure credentials with :access_key_id and :secret_access_key:

# load credentials from disk
creds = YAML.load(File.read('/path/to/secrets'))

Aws::SQS::Client.new(
  access_key_id: creds['access_key_id'],
  secret_access_key: creds['secret_access_key']
)

Always load your credentials from outside your application. Avoid configuring credentials statically and never commit them to source control.

Instance Attribute Summary

Attributes inherited from Seahorse::Client::Base

#config, #handlers

Constructor collapse

API Operations collapse

Instance Method Summary collapse

Methods inherited from Seahorse::Client::Base

add_plugin, api, #build_request, clear_plugins, define, new, #operation, #operation_names, plugins, remove_plugin, set_api, set_plugins

Methods included from Seahorse::Client::HandlerBuilder

#handle, #handle_request, #handle_response

Constructor Details

#initialize(options = {}) ⇒ Aws::SQS::Client

Constructs an API client.

Options Hash (options):

  • :access_key_id (String)

    Used to set credentials statically. See Plugins::RequestSigner for more details.

  • :convert_params (Boolean) — default: true

    When true, an attempt is made to coerce request parameters into the required types. See Plugins::ParamConverter for more details.

  • :credentials (required, Credentials)

    Your AWS credentials. The following locations will be searched in order for credentials:

    • :access_key_id, :secret_access_key, and :session_token options
    • ENV['AWS_ACCESS_KEY_ID'], ENV['AWS_SECRET_ACCESS_KEY']
    • HOME/.aws/credentials shared credentials file
    • EC2 instance profile credentials See Plugins::RequestSigner for more details.
  • :endpoint (String)

    A default endpoint is constructed from the :region. See Plugins::RegionalEndpoint for more details.

  • :http_continue_timeout (Float) — default: 1

    See Seahorse::Client::Plugins::NetHttp for more details.

  • :http_idle_timeout (Integer) — default: 5

    See Seahorse::Client::Plugins::NetHttp for more details.

  • :http_open_timeout (Integer) — default: 15

    See Seahorse::Client::Plugins::NetHttp for more details.

  • :http_proxy (String)

    See Seahorse::Client::Plugins::NetHttp for more details.

  • :http_read_timeout (Integer) — default: 60

    See Seahorse::Client::Plugins::NetHttp for more details.

  • :http_wire_trace (Boolean) — default: false

    See Seahorse::Client::Plugins::NetHttp for more details.

  • :log_level (Symbol) — default: :info

    The log level to send messages to the logger at. See Plugins::Logging for more details.

  • :log_formatter (Logging::LogFormatter)

    The log formatter. Defaults to Seahorse::Client::Logging::Formatter.default. See Plugins::Logging for more details.

  • :logger (Logger) — default: nil

    The Logger instance to send log messages to. If this option is not set, logging will be disabled. See Plugins::Logging for more details.

  • :profile (String)

    Used when loading credentials from the shared credentials file at HOME/.aws/credentials. When not specified, 'default' is used. See Plugins::RequestSigner for more details.

  • :raise_response_errors (Boolean) — default: true

    When true, response errors are raised. See Seahorse::Client::Plugins::RaiseResponseErrors for more details.

  • :region (required, String)

    The AWS region to connect to. The region is used to construct the client endpoint. Defaults to ENV['AWS_REGION']. Also checks AMAZON_REGION and AWS_DEFAULT_REGION. See Plugins::RegionalEndpoint for more details.

  • :retry_limit (Integer) — default: 3

    The maximum number of times to retry failed requests. Only ~ 500 level server errors and certain ~ 400 level client errors are retried. Generally, these are throttling errors, data checksum errors, networking errors, timeout errors and auth errors from expired credentials. See Plugins::RetryErrors for more details.

  • :secret_access_key (String)

    Used to set credentials statically. See Plugins::RequestSigner for more details.

  • :session_token (String)

    Used to set credentials statically. See Plugins::RequestSigner for more details.

  • :ssl_ca_bundle (String)

    See Seahorse::Client::Plugins::NetHttp for more details.

  • :ssl_ca_directory (String)

    See Seahorse::Client::Plugins::NetHttp for more details.

  • :ssl_ca_store (String)

    See Seahorse::Client::Plugins::NetHttp for more details.

  • :ssl_verify_peer (Boolean) — default: true

    See Seahorse::Client::Plugins::NetHttp for more details.

  • :stub_responses (Boolean) — default: false

    Causes the client to return stubbed responses. By default fake responses are generated and returned. You can specify the response data to return or errors to raise by calling ClientStubs#stub_responses. See ClientStubs for more information.

    Please note When response stubbing is enabled, no HTTP requests are made, and retries are disabled. See Plugins::StubResponses for more details.

  • :validate_params (Boolean) — default: true

    When true, request parameters are validated before sending the request. See Plugins::ParamValidator for more details.

  • :verify_checksums (Boolean) — default: true

    When true MD5 checksums will be computed for messages sent to an SQS queue and matched against MD5 checksums returned by Amazon SQS. Aws::Errors::Checksum errors are raised for cases where checksums do not match. See Plugins::SQSMd5s for more details.

Instance Method Details

#add_permission(options = {}) ⇒ Struct

Adds a permission to a queue for a specific principal. This allows sharing access to the queue.

When you create a queue, you have full control access rights for the queue. Only you, the owner of the queue, can grant or deny permissions to the queue. For more information about these permissions, see Shared Queues in the Amazon SQS Developer Guide.

AddPermission writes an Amazon-SQS-generated policy. If you want to write your own policy, use SetQueueAttributes to upload your policy. For more information about writing your own policy, see Using The Access Policy Language in the Amazon SQS Developer Guide.

Some actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Examples:

Request syntax with placeholder values


resp = client.add_permission({
  queue_url: "String", # required
  label: "String", # required
  aws_account_ids: ["String"], # required
  actions: ["String"], # required
})

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue to which permissions are added.

    Queue URLs are case-sensitive.

  • :label (required, String)

    The unique identification of the permission you\'re setting (for example, AliceSendMessage). Maximum 80 characters. Allowed characters include alphanumeric characters, hyphens (-), and underscores (_).

  • :aws_account_ids (required, Array<String>)

    The AWS account number of the principal who is given permission. The principal must have an AWS account, but does not need to be signed up for Amazon SQS. For information about locating the AWS account identification, see Your AWS Identifiers in the Amazon SQS Developer Guide.

  • :actions (required, Array<String>)

    The action the client wants to allow for the specified principal. The following values are valid:

    • *

    • ChangeMessageVisibility

    • DeleteMessage

    • GetQueueAttributes

    • GetQueueUrl

    • ReceiveMessage

    • SendMessage

    For more information about these actions, see Understanding Permissions in the Amazon SQS Developer Guide.

    Specifying SendMessage, DeleteMessage, or ChangeMessageVisibility for ActionName.n also grants permissions for the corresponding batch versions of those actions: SendMessageBatch, DeleteMessageBatch, and ChangeMessageVisibilityBatch.

Returns:

  • (Struct)

    Returns an empty response.

See Also:

#change_message_visibility(options = {}) ⇒ Struct

Changes the visibility timeout of a specified message in a queue to a new value. The maximum allowed timeout value is 12 hours. Thus, you can't extend the timeout of a message in an existing queue to more than a total visibility timeout of 12 hours. For more information, see Visibility Timeout in the Amazon SQS Developer Guide.

For example, you have a message and with the default visibility timeout of 5 minutes. After 3 minutes, you call ChangeMessageVisiblity with a timeout of 10 minutes. At that time, the timeout for the message is extended by 10 minutes beyond the time of the ChangeMessageVisibility action. This results in a total visibility timeout of 13 minutes. You can continue to call the ChangeMessageVisibility to extend the visibility timeout to a maximum of 12 hours. If you try to extend the visibility timeout beyond 12 hours, your request is rejected.

A message is considered to be in flight after it's received from a queue by a consumer, but not yet deleted from the queue.

For standard queues, there can be a maximum of 120,000 inflight messages per queue. If you reach this limit, Amazon SQS returns the OverLimit error message. To avoid reaching the limit, you should delete messages from the queue after they're processed. You can also increase the number of queues you use to process your messages.

For FIFO queues, there can be a maximum of 20,000 inflight messages per queue. If you reach this limit, Amazon SQS returns no error messages.

If you attempt to set the VisibilityTimeout to a value greater than the maximum time left, Amazon SQS returns an error. Amazon SQS doesn't automatically recalculate and increase the timeout to the maximum remaining time.

Unlike with a queue, when you change the visibility timeout for a specific message the timeout value is applied immediately but isn't saved in memory for that message. If you don't delete a message after it is received, the visibility timeout for the message reverts to the original timeout value (not to the value you set using the ChangeMessageVisibility action) the next time the message is received.

Examples:

Request syntax with placeholder values


resp = client.change_message_visibility({
  queue_url: "String", # required
  receipt_handle: "String", # required
  visibility_timeout: 1, # required
})

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue whose message\'s visibility is changed.

    Queue URLs are case-sensitive.

  • :receipt_handle (required, String)

    The receipt handle associated with the message whose visibility timeout is changed. This parameter is returned by the ReceiveMessage action.

  • :visibility_timeout (required, Integer)

    The new value for the message\'s visibility timeout (in seconds). Values values: 0 to 43200. Maximum: 12 hours.

Returns:

  • (Struct)

    Returns an empty response.

See Also:

#change_message_visibility_batch(options = {}) ⇒ Types::ChangeMessageVisibilityBatchResult

Changes the visibility timeout of multiple messages. This is a batch version of ChangeMessageVisibility. The result of the action on each message is reported individually in the response. You can send up to 10 ChangeMessageVisibility requests with each ChangeMessageVisibilityBatch action.

Because the batch request can result in a combination of successful and unsuccessful actions, you should check for batch errors even when the call returns an HTTP status code of 200.

Some actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Examples:

Request syntax with placeholder values


resp = client.change_message_visibility_batch({
  queue_url: "String", # required
  entries: [ # required
    {
      id: "String", # required
      receipt_handle: "String", # required
      visibility_timeout: 1,
    },
  ],
})

Response structure


resp.successful #=> Array
resp.successful[0].id #=> String
resp.failed #=> Array
resp.failed[0].id #=> String
resp.failed[0].sender_fault #=> true/false
resp.failed[0].code #=> String
resp.failed[0].message #=> String

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue whose messages\' visibility is changed.

    Queue URLs are case-sensitive.

  • :entries (required, Array<Types::ChangeMessageVisibilityBatchRequestEntry>)

    A list of receipt handles of the messages for which the visibility timeout must be changed.

Returns:

See Also:

#create_queue(options = {}) ⇒ Types::CreateQueueResult

Creates a new standard or FIFO queue. You can pass one or more attributes in the request. Keep the following caveats in mind:

  • If you don't specify the FifoQueue attribute, Amazon SQS creates a standard queue.

    You can't change the queue type after you create it and you can't convert an existing standard queue into a FIFO queue. You must either create a new FIFO queue for your application or delete your existing standard queue and recreate it as a FIFO queue. For more information, see Moving From a Standard Queue to a FIFO Queue in the Amazon SQS Developer Guide.

  • If you don't provide a value for an attribute, the queue is created with the default value for the attribute.

  • If you delete a queue, you must wait at least 60 seconds before creating a queue with the same name.

To successfully create a new queue, you must provide a queue name that adheres to the limits related to queues and is unique within the scope of your queues.

To get the queue URL, use the GetQueueUrl action. GetQueueUrl requires only the QueueName parameter. be aware of existing queue names:

  • If you provide the name of an existing queue along with the exact names and values of all the queue's attributes, CreateQueue returns the queue URL for the existing queue.

  • If the queue name, attribute names, or attribute values don't match an existing queue, CreateQueue returns an error.

Some actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Examples:

Request syntax with placeholder values


resp = client.create_queue({
  queue_name: "String", # required
  attributes: {
    "All" => "String",
  },
})

Response structure


resp.queue_url #=> String

Options Hash (options):

  • :queue_name (required, String)

    The name of the new queue. The following limits apply to this name:

    • A queue name can have up to 80 characters.

    • Valid values: alphanumeric characters, hyphens (-), and underscores (_).

    • A FIFO queue name must end with the .fifo suffix.

    Queue names are case-sensitive.

  • :attributes (Hash<String,String>)

    A map of attributes with their corresponding values.

    The following lists the names, descriptions, and values of the special request parameters that the CreateQueue action uses:

    • DelaySeconds - The length of time, in seconds, for which the delivery of all messages in the queue is delayed. Valid values: An integer from 0 to 900 seconds (15 minutes). The default is 0 (zero).

    • MaximumMessageSize - The limit of how many bytes a message can contain before Amazon SQS rejects it. Valid values: An integer from 1,024 bytes (1 KiB) to 262,144 bytes (256 KiB). The default is 262,144 (256 KiB).

    • MessageRetentionPeriod - The length of time, in seconds, for which Amazon SQS retains a message. Valid values: An integer from 60 seconds (1 minute) to 1,209,600 seconds (14 days). The default is 345,600 (4 days).

    • Policy - The queue\'s policy. A valid AWS policy. For more information about policy structure, see Overview of AWS IAM Policies in the Amazon IAM User Guide.

    • ReceiveMessageWaitTimeSeconds - The length of time, in seconds, for which a ReceiveMessage action waits for a message to arrive. Valid values: An integer from 0 to 20 (seconds). The default is 0 (zero).

    • RedrivePolicy - The parameters for the dead letter queue functionality of the source queue. For more information about the redrive policy and dead letter queues, see Using Amazon SQS Dead Letter Queues in the Amazon SQS Developer Guide.

      The dead letter queue of a FIFO queue must also be a FIFO queue. Similarly, the dead letter queue of a standard queue must also be a standard queue.

    • VisibilityTimeout - The visibility timeout for the queue. Valid values: An integer from 0 to 43,200 (12 hours). The default is 30. For more information about the visibility timeout, see Visibility Timeout in the Amazon SQS Developer Guide.

    The following attributes apply only to server-side-encryption:

    • KmsMasterKeyId - The ID of an AWS-managed customer master key (CMK) for Amazon SQS or a custom CMK. For more information, see Key Terms. While the alias of the AWS-managed CMK for Amazon SQS is always alias/aws/sqs, the alias of a custom CMK can, for example, be alias/aws/sqs. For more examples, see KeyId in the AWS Key Management Service API Reference.

    • KmsDataKeyReusePeriodSeconds - The length of time, in seconds, for which Amazon SQS can reuse a data key to encrypt or decrypt messages before calling AWS KMS again. An integer representing seconds, between 60 seconds (1 minute) and 86,400 seconds (24 hours). The default is 300 (5 minutes). A shorter time period provides better security but results in more calls to KMS which incur charges after Free Tier. For more information, see How Does the Data Key Reuse Period Work?.

    The following attributes apply only to FIFO (first-in-first-out) queues:

    • FifoQueue - Designates a queue as FIFO. Valid values: true, false. You can provide this attribute only during queue creation. You can\'t change it for an existing queue. When you set this attribute, you must also provide the MessageGroupId for your messages explicitly.

      For more information, see FIFO Queue Logic in the Amazon SQS Developer Guide.

    • ContentBasedDeduplication - Enables content-based deduplication. Valid values: true, false. For more information, see Exactly-Once Processing in the Amazon SQS Developer Guide.

      • Every message must have a unique MessageDeduplicationId,

        • You may provide a MessageDeduplicationId explicitly.

        • If you aren\'t able to provide a MessageDeduplicationId and you enable ContentBasedDeduplication for your queue, Amazon SQS uses a SHA-256 hash to generate the MessageDeduplicationId using the body of the message (but not the attributes of the message).

        • If you don\'t provide a MessageDeduplicationId and the queue doesn\'t have ContentBasedDeduplication set, the action fails with an error.

        • If the queue has ContentBasedDeduplication set, your MessageDeduplicationId overrides the generated one.

      • When ContentBasedDeduplication is in effect, messages with identical content sent within the deduplication interval are treated as duplicates and only one copy of the message is delivered.

      • If you send one message with ContentBasedDeduplication enabled and then another message with a MessageDeduplicationId that is the same as the one generated for the first MessageDeduplicationId, the two messages are treated as duplicates and only one copy of the message is delivered.

    Any other valid special request parameters (such as the following) are ignored:

    • ApproximateNumberOfMessages

    • ApproximateNumberOfMessagesDelayed

    • ApproximateNumberOfMessagesNotVisible

    • CreatedTimestamp

    • LastModifiedTimestamp

    • QueueArn

Returns:

See Also:

#delete_message(options = {}) ⇒ Struct

Deletes the specified message from the specified queue. You specify the message by using the message's receipt handle and not the MessageId you receive when you send the message. Even if the message is locked by another reader due to the visibility timeout setting, it is still deleted from the queue. If you leave a message in the queue for longer than the queue's configured retention period, Amazon SQS automatically deletes the message.

The receipt handle is associated with a specific instance of receiving the message. If you receive a message more than once, the receipt handle you get each time you receive the message is different. If you don't provide the most recently received receipt handle for the message when you use the DeleteMessage action, the request succeeds, but the message might not be deleted.

For standard queues, it is possible to receive a message even after you delete it. This might happen on rare occasions if one of the servers storing a copy of the message is unavailable when you send the request to delete the message. The copy remains on the server and might be returned to you on a subsequent receive request. You should ensure that your application is idempotent, so that receiving a message more than once does not cause issues.

Examples:

Request syntax with placeholder values


resp = client.delete_message({
  queue_url: "String", # required
  receipt_handle: "String", # required
})

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue from which messages are deleted.

    Queue URLs are case-sensitive.

  • :receipt_handle (required, String)

    The receipt handle associated with the message to delete.

Returns:

  • (Struct)

    Returns an empty response.

See Also:

#delete_message_batch(options = {}) ⇒ Types::DeleteMessageBatchResult

Deletes up to ten messages from the specified queue. This is a batch version of DeleteMessage. The result of the action on each message is reported individually in the response.

Because the batch request can result in a combination of successful and unsuccessful actions, you should check for batch errors even when the call returns an HTTP status code of 200.

Some actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Examples:

Request syntax with placeholder values


resp = client.delete_message_batch({
  queue_url: "String", # required
  entries: [ # required
    {
      id: "String", # required
      receipt_handle: "String", # required
    },
  ],
})

Response structure


resp.successful #=> Array
resp.successful[0].id #=> String
resp.failed #=> Array
resp.failed[0].id #=> String
resp.failed[0].sender_fault #=> true/false
resp.failed[0].code #=> String
resp.failed[0].message #=> String

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue from which messages are deleted.

    Queue URLs are case-sensitive.

  • :entries (required, Array<Types::DeleteMessageBatchRequestEntry>)

    A list of receipt handles for the messages to be deleted.

Returns:

See Also:

#delete_queue(options = {}) ⇒ Struct

Deletes the queue specified by the QueueUrl, even if the queue is empty. If the specified queue doesn't exist, Amazon SQS returns a successful response.

Be careful with the DeleteQueue action: When you delete a queue, any messages in the queue are no longer available.

When you delete a queue, the deletion process takes up to 60 seconds. Requests you send involving that queue during the 60 seconds might succeed. For example, a SendMessage request might succeed, but after 60 seconds the queue and the message you sent no longer exist.

When you delete a queue, you must wait at least 60 seconds before creating a queue with the same name.

Examples:

Request syntax with placeholder values


resp = client.delete_queue({
  queue_url: "String", # required
})

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue to delete.

    Queue URLs are case-sensitive.

Returns:

  • (Struct)

    Returns an empty response.

See Also:

#get_queue_attributes(options = {}) ⇒ Types::GetQueueAttributesResult

Gets attributes for the specified queue.

To determine whether a queue is FIFO, you can check whether QueueName ends with the .fifo suffix.

Some actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Examples:

Request syntax with placeholder values


resp = client.get_queue_attributes({
  queue_url: "String", # required
  attribute_names: ["All"], # accepts All, Policy, VisibilityTimeout, MaximumMessageSize, MessageRetentionPeriod, ApproximateNumberOfMessages, ApproximateNumberOfMessagesNotVisible, CreatedTimestamp, LastModifiedTimestamp, QueueArn, ApproximateNumberOfMessagesDelayed, DelaySeconds, ReceiveMessageWaitTimeSeconds, RedrivePolicy, FifoQueue, ContentBasedDeduplication, KmsMasterKeyId, KmsDataKeyReusePeriodSeconds
})

Response structure


resp.attributes #=> Hash
resp.attributes["QueueAttributeName"] #=> String

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue whose attribute information is retrieved.

    Queue URLs are case-sensitive.

  • :attribute_names (Array<String>)

    A list of attributes for which to retrieve information.

    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.

    The following attributes are supported:

    • All - Returns all values.

    • ApproximateNumberOfMessages - Returns the approximate number of visible messages in a queue. For more information, see Resources Required to Process Messages in the Amazon SQS Developer Guide.

    • ApproximateNumberOfMessagesDelayed - Returns the approximate number of messages that are waiting to be added to the queue.

    • ApproximateNumberOfMessagesNotVisible - Returns the approximate number of messages that have not timed-out and aren\'t deleted. For more information, see Resources Required to Process Messages in the Amazon SQS Developer Guide.

    • CreatedTimestamp - Returns the time when the queue was created in seconds (epoch time).

    • DelaySeconds - Returns the default delay on the queue in seconds.

    • LastModifiedTimestamp - Returns the time when the queue was last changed in seconds (epoch time).

    • MaximumMessageSize - Returns the limit of how many bytes a message can contain before Amazon SQS rejects it.

    • MessageRetentionPeriod - Returns the length of time, in seconds, for which Amazon SQS retains a message.

    • Policy - Returns the policy of the queue.

    • QueueArn - Returns the Amazon resource name (ARN) of the queue.

    • ReceiveMessageWaitTimeSeconds - Returns the length of time, in seconds, for which the ReceiveMessage action waits for a message to arrive.

    • RedrivePolicy - Returns the parameters for dead letter queue functionality of the source queue. For more information about the redrive policy and dead letter queues, see Using Amazon SQS Dead Letter Queues in the Amazon SQS Developer Guide.

    • VisibilityTimeout - Returns the visibility timeout for the queue. For more information about the visibility timeout, see Visibility Timeout in the Amazon SQS Developer Guide.

    The following attributes apply only to server-side-encryption:

    • KmsMasterKeyId - Returns the ID of an AWS-managed customer master key (CMK) for Amazon SQS or a custom CMK. For more information, see Key Terms.

    • KmsDataKeyReusePeriodSeconds - Returns the length of time, in seconds, for which Amazon SQS can reuse a data key to encrypt or decrypt messages before calling AWS KMS again.

    The following attributes apply only to FIFO (first-in-first-out) queues:

    • FifoQueue - Returns whether the queue is FIFO. For more information, see FIFO Queue Logic in the Amazon SQS Developer Guide.

      To determine whether a queue is FIFO, you can check whether QueueName ends with the .fifo suffix.

    • ContentBasedDeduplication - Returns whether content-based deduplication is enabled for the queue. For more information, see Exactly-Once Processing in the Amazon SQS Developer Guide.

Returns:

See Also:

#get_queue_url(options = {}) ⇒ Types::GetQueueUrlResult

Returns the URL of an existing queue. This action provides a simple way to retrieve the URL of an Amazon SQS queue.

To access a queue that belongs to another AWS account, use the QueueOwnerAWSAccountId parameter to specify the account ID of the queue's owner. The queue's owner must grant you permission to access the queue. For more information about shared queue access, see AddPermission or see Shared Queues in the Amazon SQS Developer Guide.

Examples:

Request syntax with placeholder values


resp = client.get_queue_url({
  queue_name: "String", # required
  queue_owner_aws_account_id: "String",
})

Response structure


resp.queue_url #=> String

Options Hash (options):

  • :queue_name (required, String)

    The name of the queue whose URL must be fetched. Maximum 80 characters. Valid values: alphanumeric characters, hyphens (-), and underscores (_).

    Queue names are case-sensitive.

  • :queue_owner_aws_account_id (String)

    The AWS account ID of the account that created the queue.

Returns:

See Also:

#list_dead_letter_source_queues(options = {}) ⇒ Types::ListDeadLetterSourceQueuesResult

Returns a list of your queues that have the RedrivePolicy queue attribute configured with a dead letter queue.

For more information about using dead letter queues, see Using Amazon SQS Dead Letter Queues in the Amazon SQS Developer Guide.

Examples:

Request syntax with placeholder values


resp = client.list_dead_letter_source_queues({
  queue_url: "String", # required
})

Response structure


resp.queue_urls #=> Array
resp.queue_urls[0] #=> String

Options Hash (options):

  • :queue_url (required, String)

    The URL of a dead letter queue.

    Queue URLs are case-sensitive.

Returns:

See Also:

#list_queues(options = {}) ⇒ Types::ListQueuesResult

Returns a list of your queues. The maximum number of queues that can be returned is 1,000. If you specify a value for the optional QueueNamePrefix parameter, only queues with a name that begins with the specified value are returned.

Examples:

Request syntax with placeholder values


resp = client.list_queues({
  queue_name_prefix: "String",
})

Response structure


resp.queue_urls #=> Array
resp.queue_urls[0] #=> String

Options Hash (options):

  • :queue_name_prefix (String)

    A string to use for filtering the list results. Only those queues whose name begins with the specified string are returned.

    Queue names are case-sensitive.

Returns:

See Also:

#purge_queue(options = {}) ⇒ Struct

Deletes the messages in a queue specified by the QueueURL parameter.

When you use the PurgeQueue action, you can't retrieve a message deleted from a queue.

When you purge a queue, the message deletion process takes up to 60 seconds. All messages sent to the queue before calling the PurgeQueue action are deleted. Messages sent to the queue while it is being purged might be deleted. While the queue is being purged, messages sent to the queue before PurgeQueue is called might be received, but are deleted within the next minute.

Examples:

Request syntax with placeholder values


resp = client.purge_queue({
  queue_url: "String", # required
})

Options Hash (options):

  • :queue_url (required, String)

    The URL of the queue from which the PurgeQueue action deletes messages.

    Queue URLs are case-sensitive.

Returns:

  • (Struct)

    Returns an empty response.

See Also:

#receive_message(options = {}) ⇒ Types::ReceiveMessageResult

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.

Examples:

Request syntax with placeholder values


resp = client.receive_message({
  queue_url: "String", # required
  attribute_names: ["All"], # accepts All, Policy, VisibilityTimeout, MaximumMessageSize, MessageRetentionPeriod, ApproximateNumberOfMessages, ApproximateNumberOfMessagesNotVisible, CreatedTimestamp, LastModifiedTimestamp, QueueArn, ApproximateNumberOfMessagesDelayed, DelaySeconds, ReceiveMessageWaitTimeSeconds, RedrivePolicy, FifoQueue, ContentBasedDeduplication, KmsMasterKeyId, KmsDataKeyReusePeriodSeconds
  message_attribute_names: ["MessageAttributeName"],
  max_number_of_messages: 1,
  visibility_timeout: 1,
  wait_time_seconds: 1,
  receive_request_attempt_id: "String",
})

Response structure


resp.messages #=> Array
resp.messages[0].message_id #=> String
resp.messages[0].receipt_handle #=> String
resp.messages[0].md5_of_body #=> String
resp.messages[0].body #=> String
resp.messages[0].attributes #=> Hash
resp.messages[0].attributes["MessageSystemAttributeName"] #=> String
resp.messages[0].md5_of_message_attributes #=> String
resp.messages[0].message_attributes #=> Hash
resp.messages[0].message_attributes["String"].string_value #=> String
resp.messages[0].message_attributes["String"].binary_value #=> IO
resp.messages[0].message_attributes["String"].string_list_values #=> Array
resp.messages[0].message_attributes["String"].string_list_values[0] #=> String
resp.messages[0].message_attributes["String"].binary_list_values #=> Array
resp.messages[0].message_attributes["String"].binary_list_values[0] #=> IO
resp.messages[0].message_attributes["String"].data_type #=> String

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue from which messages are received.

    Queue URLs are case-sensitive.

  • :attribute_names (Array<String>)

    A list of attributes that need to be returned along with each message. These attributes include:

    • All - Returns all values.

    • ApproximateFirstReceiveTimestamp - Returns the time the message was first received from the queue (epoch time in milliseconds).

    • ApproximateReceiveCount - Returns the number of times a message has been received from the queue but not deleted.

    • SenderId

      • For an IAM user, returns the IAM user ID, for example ABCDEFGHI1JKLMNOPQ23R.

      • For an IAM role, returns the IAM role ID, for example ABCDE1F2GH3I4JK5LMNOP:i-a123b456.

    • SentTimestamp - Returns the time the message was sent to the queue (epoch time in milliseconds).

    • MessageDeduplicationId - Returns the value provided by the sender that calls the SendMessage action.

    • MessageGroupId - Returns the value provided by the sender that calls the SendMessage action. Messages with the same MessageGroupId are returned in sequence.

    • SequenceNumber - Returns the value provided by Amazon SQS.

    Any other valid special request parameters (such as the following) are ignored:

    • ApproximateNumberOfMessages

    • ApproximateNumberOfMessagesDelayed

    • ApproximateNumberOfMessagesNotVisible

    • CreatedTimestamp

    • ContentBasedDeduplication

    • DelaySeconds

    • FifoQueue

    • LastModifiedTimestamp

    • MaximumMessageSize

    • MessageRetentionPeriod

    • Policy

    • QueueArn,

    • ReceiveMessageWaitTimeSeconds

    • RedrivePolicy

    • VisibilityTimeout

  • :message_attribute_names (Array<String>)

    The name of the message attribute, where N is the index.

    • The name can contain alphanumeric characters and the underscore (_), hyphen (-), and period (.).

    • The name is case-sensitive and must be unique among all attribute names for the message.

    • The name must not start with AWS-reserved prefixes such as AWS. or Amazon. (or any casing variants).

    • The name must not start or end with a period (.), and it should not have periods in succession (..).

    • The name can be up to 256 characters long.

    When using ReceiveMessage, you can send a list of attribute names to receive, or you can return all of the attributes by specifying All or .* in your request. You can also use all message attributes starting with a prefix, for example bar.*.

  • :max_number_of_messages (Integer)

    The maximum number of messages to return. Amazon SQS never returns more messages than this value (however, fewer messages might be returned). Valid values are 1 to 10. Default is 1.

  • :visibility_timeout (Integer)

    The duration (in seconds) that the received messages are hidden from subsequent retrieve requests after being retrieved by a ReceiveMessage request.

  • :wait_time_seconds (Integer)

    The duration (in seconds) for which the call waits for a message to arrive in the queue before returning. If a message is available, the call returns sooner than WaitTimeSeconds.

  • :receive_request_attempt_id (String)

    This parameter applies only to FIFO (first-in-first-out) queues.

    The token used for deduplication of ReceiveMessage calls. If a networking issue occurs after a ReceiveMessage action, and instead of a response you receive a generic error, you can retry the same action with an identical ReceiveRequestAttemptId to retrieve the same set of messages, even if their visibility timeout has not yet expired.

    • You can use ReceiveRequestAttemptId only for 5 minutes after a ReceiveMessage action.

    • When you set FifoQueue, a caller of the ReceiveMessage action can provide a ReceiveRequestAttemptId explicitly.

    • If a caller of the ReceiveMessage action doesn\'t provide a ReceiveRequestAttemptId, Amazon SQS generates a ReceiveRequestAttemptId.

    • You can retry the ReceiveMessage action with the same ReceiveRequestAttemptId if none of the messages have been modified (deleted or had their visibility changes).

    • During a visibility timeout, subsequent calls with the same ReceiveRequestAttemptId return the same messages and receipt handles. If a retry occurs within the deduplication interval, it resets the visibility timeout. For more information, see Visibility Timeout in the Amazon Simple Queue Service Developer Guide.

      If a caller of the ReceiveMessage action is still processing messages when the visibility timeout expires and messages become visible, another worker reading from the same queue can receive the same messages and therefore process duplicates. Also, if a reader whose message processing time is longer than the visibility timeout tries to delete the processed messages, the action fails with an error.

      To mitigate this effect, ensure that your application observes a safe threshold before the visibility timeout expires and extend the visibility timeout as necessary.

    • While messages with a particular MessageGroupId are invisible, no more messages belonging to the same MessageGroupId are returned until the visibility timeout expires. You can still receive messages with another MessageGroupId as long as it is also visible.

    • If a caller of ReceiveMessage can\'t track the ReceiveRequestAttemptId, no retries work until the original visibility timeout expires. As a result, delays might occur but the messages in the queue remain in a strict order.

    The length of ReceiveRequestAttemptId is 128 characters. ReceiveRequestAttemptId can contain alphanumeric characters (a-z, A-Z, 0-9) and punctuation (!"#$%&'()*+,-./:;<=>?@[\]^_``{|}`~ ).

    For best practices of using ReceiveRequestAttemptId, see Using the ReceiveRequestAttemptId Request Parameter in the Amazon Simple Queue Service Developer Guide.

Returns:

See Also:

#remove_permission(options = {}) ⇒ Struct

Revokes any permissions in the queue policy that matches the specified Label parameter. Only the owner of the queue can remove permissions.

Examples:

Request syntax with placeholder values


resp = client.remove_permission({
  queue_url: "String", # required
  label: "String", # required
})

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue from which permissions are removed.

    Queue URLs are case-sensitive.

  • :label (required, String)

    The identification of the permission to remove. This is the label added using the AddPermission action.

Returns:

  • (Struct)

    Returns an empty response.

See Also:

#send_message(options = {}) ⇒ Types::SendMessageResult

Delivers a message to the specified queue.

A message can include only XML, JSON, and unformatted text. The following Unicode characters are allowed:

#x9 | #xA | #xD | #x20 to #xD7FF | #xE000 to #xFFFD | #x10000 to #x10FFFF

Any characters not included in this list will be rejected. For more information, see the W3C specification for characters.

Examples:

Request syntax with placeholder values


resp = client.send_message({
  queue_url: "String", # required
  message_body: "String", # required
  delay_seconds: 1,
  message_attributes: {
    "String" => {
      string_value: "String",
      binary_value: "data",
      string_list_values: ["String"],
      binary_list_values: ["data"],
      data_type: "String", # required
    },
  },
  message_deduplication_id: "String",
  message_group_id: "String",
})

Response structure


resp.md5_of_message_body #=> String
resp.md5_of_message_attributes #=> String
resp.message_id #=> String
resp.sequence_number #=> String

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue to which a message is sent.

    Queue URLs are case-sensitive.

  • :message_body (required, String)

    The message to send. The maximum string size is 256 KB.

    A message can include only XML, JSON, and unformatted text. The following Unicode characters are allowed:

    #x9 | #xA | #xD | #x20 to #xD7FF | #xE000 to #xFFFD | #x10000 to #x10FFFF

    Any characters not included in this list will be rejected. For more information, see the W3C specification for characters.

  • :delay_seconds (Integer)

    The length of time, in seconds, for which to delay a specific message. Valid values: 0 to 900. Maximum: 15 minutes. Messages with a positive DelaySeconds value become available for processing after the delay period is finished. If you don\'t specify a value, the default value for the queue applies.

    When you set FifoQueue, you can\'t set DelaySeconds per message. You can set this parameter only on a queue level.

  • :message_attributes (Hash<String,Types::MessageAttributeValue>)

    Each message attribute consists of a Name, Type, and Value. For more information, see Message Attribute Items and Validation in the Amazon SQS Developer Guide.

  • :message_deduplication_id (String)

    This parameter applies only to FIFO (first-in-first-out) queues.

    The token used for deduplication of sent messages. If a message with a particular MessageDeduplicationId is sent successfully, any messages sent with the same MessageDeduplicationId are accepted successfully but aren\'t delivered during the 5-minute deduplication interval. For more information, see Exactly-Once Processing in the Amazon SQS Developer Guide.

    • Every message must have a unique MessageDeduplicationId,

      • You may provide a MessageDeduplicationId explicitly.

      • If you aren\'t able to provide a MessageDeduplicationId and you enable ContentBasedDeduplication for your queue, Amazon SQS uses a SHA-256 hash to generate the MessageDeduplicationId using the body of the message (but not the attributes of the message).

      • If you don\'t provide a MessageDeduplicationId and the queue doesn\'t have ContentBasedDeduplication set, the action fails with an error.

      • If the queue has ContentBasedDeduplication set, your MessageDeduplicationId overrides the generated one.

    • When ContentBasedDeduplication is in effect, messages with identical content sent within the deduplication interval are treated as duplicates and only one copy of the message is delivered.

    • If you send one message with ContentBasedDeduplication enabled and then another message with a MessageDeduplicationId that is the same as the one generated for the first MessageDeduplicationId, the two messages are treated as duplicates and only one copy of the message is delivered.

    The MessageDeduplicationId is available to the recipient of the message (this can be useful for troubleshooting delivery issues).

    If a message is sent successfully but the acknowledgement is lost and the message is resent with the same MessageDeduplicationId after the deduplication interval, Amazon SQS can\'t detect duplicate messages.

    The length of MessageDeduplicationId is 128 characters. MessageDeduplicationId can contain alphanumeric characters (a-z, A-Z, 0-9) and punctuation (!"#$%&'()*+,-./:;<=>?@[\]^_``{|}`~ ).

    For best practices of using MessageDeduplicationId, see Using the MessageDeduplicationId Property in the Amazon Simple Queue Service Developer Guide.

  • :message_group_id (String)

    This parameter applies only to FIFO (first-in-first-out) queues.

    The tag that specifies that a message belongs to a specific message group. Messages that belong to the same message group are processed in a FIFO manner (however, messages in different message groups might be processed out of order). To interleave multiple ordered streams within a single queue, use MessageGroupId values (for example, session data for multiple users). In this scenario, multiple readers can process the queue, but the session data of each user is processed in a FIFO fashion.

    • You must associate a non-empty MessageGroupId with a message. If you don\'t provide a MessageGroupId, the action fails.

    • ReceiveMessage might return messages with multiple MessageGroupId values. For each MessageGroupId, the messages are sorted by time sent. The caller can\'t specify a MessageGroupId.

    The length of MessageGroupId is 128 characters. Valid values are alphanumeric characters and punctuation (!"#$%&'()*+,-./:;<=>?@[\]^_``{|}`~).

    For best practices of using MessageGroupId, see Using the MessageGroupId Property in the Amazon Simple Queue Service Developer Guide.

    MessageGroupId is required for FIFO queues. You can\'t use it for Standard queues.

Returns:

See Also:

#send_message_batch(options = {}) ⇒ Types::SendMessageBatchResult

Delivers up to ten messages to the specified queue. This is a batch version of SendMessage. For a FIFO queue, multiple messages within a single batch are enqueued in the order they are sent.

The result of sending each message is reported individually in the response. Because the batch request can result in a combination of successful and unsuccessful actions, you should check for batch errors even when the call returns an HTTP status code of 200.

The maximum allowed individual message size and the maximum total payload size (the sum of the individual lengths of all of the batched messages) are both 256 KB (262,144 bytes).

A message can include only XML, JSON, and unformatted text. The following Unicode characters are allowed:

#x9 | #xA | #xD | #x20 to #xD7FF | #xE000 to #xFFFD | #x10000 to #x10FFFF

Any characters not included in this list will be rejected. For more information, see the W3C specification for characters.

If you don't specify the DelaySeconds parameter for an entry, Amazon SQS uses the default value for the queue.

Some actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Examples:

Request syntax with placeholder values


resp = client.send_message_batch({
  queue_url: "String", # required
  entries: [ # required
    {
      id: "String", # required
      message_body: "String", # required
      delay_seconds: 1,
      message_attributes: {
        "String" => {
          string_value: "String",
          binary_value: "data",
          string_list_values: ["String"],
          binary_list_values: ["data"],
          data_type: "String", # required
        },
      },
      message_deduplication_id: "String",
      message_group_id: "String",
    },
  ],
})

Response structure


resp.successful #=> Array
resp.successful[0].id #=> String
resp.successful[0].message_id #=> String
resp.successful[0].md5_of_message_body #=> String
resp.successful[0].md5_of_message_attributes #=> String
resp.successful[0].sequence_number #=> String
resp.failed #=> Array
resp.failed[0].id #=> String
resp.failed[0].sender_fault #=> true/false
resp.failed[0].code #=> String
resp.failed[0].message #=> String

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue to which batched messages are sent.

    Queue URLs are case-sensitive.

  • :entries (required, Array<Types::SendMessageBatchRequestEntry>)

    A list of SendMessageBatchRequestEntry items.

Returns:

See Also:

#set_queue_attributes(options = {}) ⇒ Struct

Sets the value of one or more queue attributes. When you change a queue's attributes, the change can take up to 60 seconds for most of the attributes to propagate throughout the Amazon SQS system. Changes made to the MessageRetentionPeriod attribute can take up to 15 minutes.

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.

Examples:

Request syntax with placeholder values


resp = client.set_queue_attributes({
  queue_url: "String", # required
  attributes: { # required
    "All" => "String",
  },
})

Options Hash (options):

  • :queue_url (required, String)

    The URL of the Amazon SQS queue whose attributes are set.

    Queue URLs are case-sensitive.

  • :attributes (required, Hash<String,String>)

    A map of attributes to set.

    The following lists the names, descriptions, and values of the special request parameters that the SetQueueAttributes action uses:

    • DelaySeconds - The length of time, in seconds, for which the delivery of all messages in the queue is delayed. Valid values: An integer from 0 to 900 (15 minutes). The default is 0 (zero).

    • MaximumMessageSize - The limit of how many bytes a message can contain before Amazon SQS rejects it. Valid values: An integer from 1,024 bytes (1 KiB) up to 262,144 bytes (256 KiB). The default is 262,144 (256 KiB).

    • MessageRetentionPeriod - The length of time, in seconds, for which Amazon SQS retains a message. Valid values: An integer representing seconds, from 60 (1 minute) to 1,209,600 (14 days). The default is 345,600 (4 days).

    • Policy - The queue\'s policy. A valid AWS policy. For more information about policy structure, see Overview of AWS IAM Policies in the Amazon IAM User Guide.

    • ReceiveMessageWaitTimeSeconds - The length of time, in seconds, for which a ReceiveMessage action waits for a message to arrive. Valid values: an integer from 0 to 20 (seconds). The default is 0.

    • RedrivePolicy - The parameters for the dead letter queue functionality of the source queue. For more information about the redrive policy and dead letter queues, see Using Amazon SQS Dead Letter Queues in the Amazon SQS Developer Guide.

      The dead letter queue of a FIFO queue must also be a FIFO queue. Similarly, the dead letter queue of a standard queue must also be a standard queue.

    • VisibilityTimeout - The visibility timeout for the queue. Valid values: an integer from 0 to 43,200 (12 hours). The default is 30. For more information about the visibility timeout, see Visibility Timeout in the Amazon SQS Developer Guide.

    The following attributes apply only to server-side-encryption:

    • KmsMasterKeyId - The ID of an AWS-managed customer master key (CMK) for Amazon SQS or a custom CMK. For more information, see Key Terms. While the alias of the AWS-managed CMK for Amazon SQS is always alias/aws/sqs, the alias of a custom CMK can, for example, be alias/aws/sqs. For more examples, see KeyId in the AWS Key Management Service API Reference.

    • KmsDataKeyReusePeriodSeconds - The length of time, in seconds, for which Amazon SQS can reuse a data key to encrypt or decrypt messages before calling AWS KMS again. An integer representing seconds, between 60 seconds (1 minute) and 86,400 seconds (24 hours). The default is 300 (5 minutes). A shorter time period provides better security but results in more calls to KMS which incur charges after Free Tier. For more information, see How Does the Data Key Reuse Period Work?.

    The following attribute applies only to FIFO (first-in-first-out) queues:

    • ContentBasedDeduplication - Enables content-based deduplication. For more information, see Exactly-Once Processing in the Amazon SQS Developer Guide.

      • Every message must have a unique MessageDeduplicationId,

        • You may provide a MessageDeduplicationId explicitly.

        • If you aren\'t able to provide a MessageDeduplicationId and you enable ContentBasedDeduplication for your queue, Amazon SQS uses a SHA-256 hash to generate the MessageDeduplicationId using the body of the message (but not the attributes of the message).

        • If you don\'t provide a MessageDeduplicationId and the queue doesn\'t have ContentBasedDeduplication set, the action fails with an error.

        • If the queue has ContentBasedDeduplication set, your MessageDeduplicationId overrides the generated one.

      • When ContentBasedDeduplication is in effect, messages with identical content sent within the deduplication interval are treated as duplicates and only one copy of the message is delivered.

      • If you send one message with ContentBasedDeduplication enabled and then another message with a MessageDeduplicationId that is the same as the one generated for the first MessageDeduplicationId, the two messages are treated as duplicates and only one copy of the message is delivered.

    Any other valid special request parameters (such as the following) are ignored:

    • ApproximateNumberOfMessages

    • ApproximateNumberOfMessagesDelayed

    • ApproximateNumberOfMessagesNotVisible

    • CreatedTimestamp

    • LastModifiedTimestamp

    • QueueArn

Returns:

  • (Struct)

    Returns an empty response.

See Also:

#wait_until(waiter_name, params = {}) {|waiter| ... } ⇒ Boolean

Waiters polls an API operation until a resource enters a desired state.

Basic Usage

Waiters will poll until they are succesful, they fail by entering a terminal state, or until a maximum number of attempts are made.

# polls in a loop, sleeping between attempts client.waiter_until(waiter_name, params)

Configuration

You can configure the maximum number of polling attempts, and the delay (in seconds) between each polling attempt. You configure waiters by passing a block to #wait_until:

# poll for ~25 seconds
client.wait_until(...) do |w|
  w.max_attempts = 5
  w.delay = 5
end

Callbacks

You can be notified before each polling attempt and before each delay. If you throw :success or :failure from these callbacks, it will terminate the waiter.

started_at = Time.now
client.wait_until(...) do |w|

  # disable max attempts
  w.max_attempts = nil

  # poll for 1 hour, instead of a number of attempts
  w.before_wait do |attempts, response|
    throw :failure if Time.now - started_at > 3600
  end

end

Handling Errors

When a waiter is successful, it returns true. When a waiter fails, it raises an error. All errors raised extend from Waiters::Errors::WaiterFailed.

begin
  client.wait_until(...)
rescue Aws::Waiters::Errors::WaiterFailed
  # resource did not enter the desired state in time
end

Parameters:

  • waiter_name (Symbol)

    The name of the waiter. See #waiter_names for a full list of supported waiters.

  • params (Hash) (defaults to: {})

    Additional request parameters. See the #waiter_names for a list of supported waiters and what request they call. The called request determines the list of accepted parameters.

Yield Parameters:

Returns:

  • (Boolean)

    Returns true if the waiter was successful.

Raises:

  • (Errors::FailureStateError)

    Raised when the waiter terminates because the waiter has entered a state that it will not transition out of, preventing success.

  • (Errors::TooManyAttemptsError)

    Raised when the configured maximum number of attempts have been made, and the waiter is not yet successful.

  • (Errors::UnexpectedError)

    Raised when an error is encounted while polling for a resource that is not expected.

  • (Errors::NoSuchWaiterError)

    Raised when you request to wait for an unknown state.

#waiter_namesArray<Symbol>

Returns the list of supported waiters. The following table lists the supported waiters and the client method they call:

Waiter NameClient MethodDefault Delay:Default Max Attempts:

Returns:

  • (Array<Symbol>)

    the list of supported waiters.