Amazon SQS examples using SDK for Ruby - Amazon SDK for Ruby

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Amazon SQS examples using SDK for Ruby

The following code examples show you how to perform actions and implement common scenarios by using the Amazon SDK for Ruby with Amazon SQS.

Actions are code excerpts from larger programs and must be run in context. While actions show you how to call individual service functions, you can see actions in context in their related scenarios and cross-service examples.

Scenarios are code examples that show you how to accomplish a specific task by calling multiple functions within the same service.

Each example includes a link to GitHub, where you can find instructions on how to set up and run the code in context.

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The following code example shows how to use ChangeMessageVisibility.

SDK for Ruby

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.



require "aws-sdk-sqs"  # v2: require 'aws-sdk'
# Replace us-west-2 with the AWS Region you're using for Amazon SQS.
sqs = Aws::SQS::Client.new(region: "us-west-2")

begin
  queue_name = "my-queue"
  queue_url = sqs.get_queue_url(queue_name: queue_name).queue_url

  receive_message_result_before = sqs.receive_message({
    queue_url: queue_url,
    max_number_of_messages: 10 # Receive up to 10 messages, if there are that many.
  })

  puts "Before attempting to change message visibility timeout: received #{receive_message_result_before.messages.count} message(s)."

  receive_message_result_before.messages.each do |message|
    sqs.change_message_visibility({
      queue_url: queue_url,
      receipt_handle: message.receipt_handle,
      visibility_timeout: 30 # This message will not be visible for 30 seconds after first receipt.
    })
  end

  # Try to retrieve the original messages after setting their visibility timeout.
  receive_message_result_after = sqs.receive_message({
    queue_url: queue_url,
    max_number_of_messages: 10
  })

  puts "\nAfter attempting to change message visibility timeout: received #{receive_message_result_after.messages.count} message(s)."

rescue Aws::SQS::Errors::NonExistentQueue
  puts "Cannot receive messages for a queue named '#{receive_queue_name}', as it does not exist."
end

For API details, see ChangeMessageVisibility in Amazon SDK for Ruby API Reference.

The following code example shows how to use CreateQueue.

SDK for Ruby

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.


# This code example demonstrates how to create a queue in Amazon Simple Queue Service (Amazon SQS).

require "aws-sdk-sqs"

# @param sqs_client [Aws::SQS::Client] An initialized Amazon SQS client.
# @param queue_name [String] The name of the queue.
# @return [Boolean] true if the queue was created; otherwise, false.
# @example
#   exit 1 unless queue_created?(
#     Aws::SQS::Client.new(region: 'us-west-2'),
#     'my-queue'
#   )
def queue_created?(sqs_client, queue_name)
  sqs_client.create_queue(queue_name: queue_name)
  true
rescue StandardError => e
  puts "Error creating queue: #{e.message}"
  false
end

# Full example call:
# Replace us-west-2 with the AWS Region you're using for Amazon SQS.
def run_me
  region = "us-west-2"
  queue_name = "my-queue"
  sqs_client = Aws::SQS::Client.new(region: region)

  puts "Creating the queue named '#{queue_name}'..."

  if queue_created?(sqs_client, queue_name)
    puts "Queue created."
  else
    puts "Queue not created."
  end
end

# Example usage:
run_me if $PROGRAM_NAME == __FILE__

For API details, see CreateQueue in Amazon SDK for Ruby API Reference.

The following code example shows how to use DeleteQueue.

SDK for Ruby

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.


require "aws-sdk-sqs"  # v2: require 'aws-sdk'
# Replace us-west-2 with the AWS Region you're using for Amazon SQS.
sqs = Aws::SQS::Client.new(region: "us-west-2")

sqs.delete_queue(queue_url: URL)

For API details, see DeleteQueue in Amazon SDK for Ruby API Reference.

The following code example shows how to use ListQueues.

SDK for Ruby

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.



require "aws-sdk-sqs"
require "aws-sdk-sts"

# @param sqs_client [Aws::SQS::Client] An initialized Amazon SQS client.
# @example
#   list_queue_urls(Aws::SQS::Client.new(region: 'us-west-2'))
def list_queue_urls(sqs_client)
  queues = sqs_client.list_queues

  queues.queue_urls.each do |url|
    puts url
  end
rescue StandardError => e
  puts "Error listing queue URLs: #{e.message}"
end

# Lists the attributes of a queue in Amazon Simple Queue Service (Amazon SQS).
#
# @param sqs_client [Aws::SQS::Client] An initialized Amazon SQS client.
# @param queue_url [String] The URL of the queue.
# @example
#   list_queue_attributes(
#     Aws::SQS::Client.new(region: 'us-west-2'),
#     'https://sqs.us-west-2.amazonaws.com/111111111111/my-queue'
#   )
def list_queue_attributes(sqs_client, queue_url)
  attributes = sqs_client.get_queue_attributes(
    queue_url: queue_url,
    attribute_names: ["All"]
  )

  attributes.attributes.each do |key, value|
    puts "#{key}: #{value}"
  end

rescue StandardError => e
  puts "Error getting queue attributes: #{e.message}"
end

# Full example call:
# Replace us-west-2 with the AWS Region you're using for Amazon SQS.
def run_me
  region = "us-west-2"
  queue_name = "my-queue"

  sqs_client = Aws::SQS::Client.new(region: region)

  puts "Listing available queue URLs..."
  list_queue_urls(sqs_client)

  sts_client = Aws::STS::Client.new(region: region)

  # For example:
  # 'https://sqs.us-west-2.amazonaws.com/111111111111/my-queue'
  queue_url = "https://sqs." + region + ".amazonaws.com/" +
    sts_client.get_caller_identity.account + "/" + queue_name

  puts "\nGetting information about queue '#{queue_name}'..."
  list_queue_attributes(sqs_client, queue_url)
end

For API details, see ListQueues in Amazon SDK for Ruby API Reference.

The following code example shows how to use ReceiveMessage.

SDK for Ruby

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.



require "aws-sdk-sqs"
require "aws-sdk-sts"

# Receives messages in a queue in Amazon Simple Queue Service (Amazon SQS).
#
# @param sqs_client [Aws::SQS::Client] An initialized Amazon SQS client.
# @param queue_url [String] The URL of the queue.
# @param max_number_of_messages [Integer] The maximum number of messages
#   to receive. This number must be 10 or less. The default is 10.
# @example
#   receive_messages(
#     Aws::SQS::Client.new(region: 'us-west-2'),
#     'https://sqs.us-west-2.amazonaws.com/111111111111/my-queue',
#     10
#   )
def receive_messages(sqs_client, queue_url, max_number_of_messages = 10)

  if max_number_of_messages > 10
    puts "Maximum number of messages to receive must be 10 or less. " \
      "Stopping program."
    return
  end

  response = sqs_client.receive_message(
    queue_url: queue_url,
    max_number_of_messages: max_number_of_messages
  )

  if response.messages.count.zero?
    puts "No messages to receive, or all messages have already " \
      "been previously received."
    return
  end

  response.messages.each do |message|
    puts "-" * 20
    puts "Message body: #{message.body}"
    puts "Message ID:   #{message.message_id}"
  end

rescue StandardError => e
  puts "Error receiving messages: #{e.message}"
end

# Full example call:
# Replace us-west-2 with the AWS Region you're using for Amazon SQS.
def run_me
  region = "us-west-2"
  queue_name = "my-queue"
  max_number_of_messages = 10

  sts_client = Aws::STS::Client.new(region: region)

  # For example:
  # 'https://sqs.us-west-2.amazonaws.com/111111111111/my-queue'
  queue_url = "https://sqs." + region + ".amazonaws.com/" +
    sts_client.get_caller_identity.account + "/" + queue_name

  sqs_client = Aws::SQS::Client.new(region: region)

  puts "Receiving messages from queue '#{queue_name}'..."

  receive_messages(sqs_client, queue_url, max_number_of_messages)
end

# Example usage:
run_me if $PROGRAM_NAME == __FILE__

For API details, see ReceiveMessage in Amazon SDK for Ruby API Reference.

The following code example shows how to use SendMessage.

SDK for Ruby

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.



require "aws-sdk-sqs"
require "aws-sdk-sts"

# @param sqs_client [Aws::SQS::Client] An initialized Amazon SQS client.
# @param queue_url [String] The URL of the queue.
# @param message_body [String] The contents of the message to be sent.
# @return [Boolean] true if the message was sent; otherwise, false.
# @example
#   exit 1 unless message_sent?(
#     Aws::SQS::Client.new(region: 'us-west-2'),
#     'https://sqs.us-west-2.amazonaws.com/111111111111/my-queue',
#     'This is my message.'
#   )
def message_sent?(sqs_client, queue_url, message_body)
  sqs_client.send_message(
    queue_url: queue_url,
    message_body: message_body
  )
  true
rescue StandardError => e
  puts "Error sending message: #{e.message}"
  false
end

# Full example call:
# Replace us-west-2 with the AWS Region you're using for Amazon SQS.
def run_me
  region = "us-west-2"
  queue_name = "my-queue"
  message_body = "This is my message."

  sts_client = Aws::STS::Client.new(region: region)

  # For example:
  # 'https://sqs.us-west-2.amazonaws.com/111111111111/my-queue'
  queue_url = "https://sqs." + region + ".amazonaws.com/" +
    sts_client.get_caller_identity.account + "/" + queue_name

  sqs_client = Aws::SQS::Client.new(region: region)

  puts "Sending a message to the queue named '#{queue_name}'..."

  if message_sent?(sqs_client, queue_url, message_body)
    puts "Message sent."
  else
    puts "Message not sent."
  end
end

# Example usage:
run_me if $PROGRAM_NAME == __FILE__

For API details, see SendMessage in Amazon SDK for Ruby API Reference.

The following code example shows how to use SendMessageBatch.

SDK for Ruby

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.



require "aws-sdk-sqs"
require "aws-sdk-sts"

#
# @param sqs_client [Aws::SQS::Client] An initialized Amazon SQS client.
# @param queue_url [String] The URL of the queue.
# @param entries [Hash] The contents of the messages to be sent,
#   in the correct format.
# @return [Boolean] true if the messages were sent; otherwise, false.
# @example
#   exit 1 unless messages_sent?(
#     Aws::SQS::Client.new(region: 'us-west-2'),
#     'https://sqs.us-west-2.amazonaws.com/111111111111/my-queue',
#     [
#       {
#         id: 'Message1',
#         message_body: 'This is the first message.'
#       },
#       {
#         id: 'Message2',
#         message_body: 'This is the second message.'
#       }
#     ]
#   )
def messages_sent?(sqs_client, queue_url, entries)
  sqs_client.send_message_batch(
    queue_url: queue_url,
    entries: entries
  )
  true
rescue StandardError => e
  puts "Error sending messages: #{e.message}"
  false
end

# Full example call:
# Replace us-west-2 with the AWS Region you're using for Amazon SQS.
def run_me
  region = "us-west-2"
  queue_name = "my-queue"
  entries = [
    {
      id: "Message1",
      message_body: "This is the first message."
    },
    {
      id: "Message2",
      message_body: "This is the second message."
    }
  ]

  sts_client = Aws::STS::Client.new(region: region)

  # For example:
  # 'https://sqs.us-west-2.amazonaws.com/111111111111/my-queue'
  queue_url = "https://sqs." + region + ".amazonaws.com/" +
    sts_client.get_caller_identity.account + "/" + queue_name

  sqs_client = Aws::SQS::Client.new(region: region)

  puts "Sending messages to the queue named '#{queue_name}'..."

  if messages_sent?(sqs_client, queue_url, entries)
    puts "Messages sent."
  else
    puts "Messages not sent."
  end
end

For API details, see SendMessageBatch in Amazon SDK for Ruby API Reference.

Serverless examples

The following code example shows how to implement a Lambda function that receives an event triggered by receiving messages from an SQS queue. The function retrieves the messages from the event parameter and logs the content of each message.

SDK for Ruby

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Serverless examples repository.

Consuming an SQS event with Lambda using Ruby.


# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0
def lambda_handler(event:, context:)
  event['Records'].each do |message|
    process_message(message)
  end
  puts "done"
end

def process_message(message)
  begin
    puts "Processed message #{message['body']}"
    # TODO: Do interesting work based on the new message
  rescue StandardError => err
    puts "An error occurred"
    raise err
  end
end

The following code example shows how to implement partial batch response for Lambda functions that receive events from an SQS queue. The function reports the batch item failures in the response, signaling to Lambda to retry those messages later.

SDK for Ruby

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the Serverless examples repository.

Reporting SQS batch item failures with Lambda using Ruby.


# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0
require 'json'

def lambda_handler(event:, context:)
  if event
    batch_item_failures = []
    sqs_batch_response = {}

    event["Records"].each do |record|
      begin
        # process message
      rescue StandardError => e
        batch_item_failures << {"itemIdentifier" => record['messageId']}
      end
    end

    sqs_batch_response["batchItemFailures"] = batch_item_failures
    return sqs_batch_response
  end
end

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