### Create Kafka Topic

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/apache-kafka.md

Use this command to create a new topic in Kafka. Ensure Kafka is installed and running.

```bash
kafka-topics --create --zookeeper localhost:2181 --partitions 3 --topic test
```

--------------------------------

### SQS Integration Example

Source: https://github.com/elixir-broadway/broadway/blob/main/README.md

A basic example demonstrating how to configure Broadway to consume messages from Amazon SQS and process them. Ensure broadway_sqs is a dependency and credentials are set up.

```elixir
defmodule MyBroadway do
  use Broadway

  alias Broadway.Message

  def start_link(_opts) do
    Broadway.start_link(__MODULE__,
      name: __MODULE__,
      producer: [
        module: {BroadwaySQS.Producer, queue_url: "https://us-east-2.queue.amazonaws.com/100000000001/my_queue"}
      ],
      processors: [
        default: [concurrency: 50]
      ],
      batchers: [
        s3: [concurrency: 5, batch_size: 10, batch_timeout: 1000]
      ]
    )
  end

  def handle_message(_processor_name, message, _context) do
    message
    |> Message.update_data(&process_data/1)
    |> Message.put_batcher(:s3)
  end

  def handle_batch(:s3, messages, _batch_info, _context) do
    # Send batch of messages to S3
  end

  defp process_data(data) do
    # Do some calculations, generate a JSON representation, process images.
  end
end
```

--------------------------------

### Tune Broadway Pipeline Configuration

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Example of how to set concurrency, max_demand, batch_size, and batch_timeout for producers, processors, and batchers in a Broadway pipeline.

```elixir
defmodule MyBroadway do
  use Broadway

  def start_link(_opts) do
    Broadway.start_link(__MODULE__,
      name: __MODULE__,
      producer: [
        ...
        concurrency: 10,
      ],
      processors: [
        default: [
          concurrency: 100,
          max_demand: 1,
        ]
      ],
      batchers: [
        default: [
          batch_size: 10,
          concurrency: 10,
        ]
      ])
  end

  ...callbacks...
end
```

--------------------------------

### Tuning Broadway Pipeline Configuration

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/amazon-sqs.md

Example of setting concurrency, max_demand, and batch_size for producers, processors, and batchers in a Broadway pipeline.

```elixir
defmodule MyBroadway do
  use Broadway

  def start_link(_opts) do
    Broadway.start_link(__MODULE__,
      name: __MODULE__,
      producer: [
        ...
        concurrency: 10,
      ],
      processors: [
        default: [
          concurrency: 100,
          max_demand: 1,
        ]
      ],
      batchers: [
        default: [
          batch_size: 10,
          concurrency: 10,
        ]
      ]
    )
  end

  ...callbacks...
end
```

--------------------------------

### Implement Broadway Callbacks

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/amazon-sqs.md

Implement `handle_message/3` to process individual messages and `handle_batch/4` to process batches of messages. This example updates message data and inspects batches.

```elixir
defmodule MyBroadway do
  use Broadway

  alias Broadway.Message

  ...start_link...

  @impl true
  def handle_message(_, %Message{data: data} = message, _) do
    message
    |> Message.update_data(fn data -> data * data end)
  end

  @impl true
  def handle_batch(_, messages, _, _) do
    list = messages |> Enum.map(fn e -> e.data end)
    IO.inspect(list, label: "Got batch of finished jobs from processors, sending ACKs to SQS as a batch.")
    messages
  end
end
```

--------------------------------

### Implement Broadway Callbacks

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Implement `handle_message/3` to process individual messages and `handle_batch/4` to process batches of messages. This example converts message data to uppercase.

```elixir
defmodule MyBroadway do
  use Broadway

  alias Broadway.Message

  ...start_link...

  def handle_message(_, %Message{data: data} = message, _) do
    message
    |> Message.update_data(fn data -> String.upcase(data) end)
  end

  def handle_batch(_, messages, _, _) do
    list = messages |> Enum.map(fn e -> e.data end)
    IO.inspect(list, label: "Got batch of finished jobs from processors, sending ACKs to Pub/Sub as a batch.")
    messages
  end
end
```

--------------------------------

### Define Broadway Pipeline Configuration

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/rabbitmq.md

Configure the Broadway pipeline with producers, processors, and batchers. This example sets up a producer for 'my_queue' with specific QoS settings and defines concurrency and batching parameters.

```elixir
defmodule MyBroadway do
  use Broadway

  alias Broadway.Message

  def start_link(_opts) do
    Broadway.start_link(__MODULE__,
      name: MyBroadway,
      producer: [
        module: {BroadwayRabbitMQ.Producer,
          queue: "my_queue",
          qos: [
            prefetch_count: 50,
          ]
        },
        concurrency: 1
      ],
      processors: [
        default: [
          concurrency: 50
        ]
      ],
      batchers: [
        default: [
          batch_size: 10,
          batch_timeout: 1500,
          concurrency: 5
        ]
      ]
    )
  end

  ...callbacks...
end
```

--------------------------------

### Send Messages to Kafka using Brod

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/apache-kafka.md

Start a Brod client and producer, then send messages synchronously to a specified Kafka topic and partition.

```elixir
topic = "test"
client_id = :my_client
hosts = [localhost: 9092]

:ok = :brod.start_client(hosts, client_id, _client_config=[])
:ok = :brod.start_producer(client_id, topic, _producer_config = [])

Enum.each(1..1000, fn i ->
  partition = rem(i, 3)
  :ok = :brod.produce_sync(client_id, topic, partition, _key="", "#{i}")
end)
```

--------------------------------

### Define Broadway Pipeline Configuration

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Configure the Broadway pipeline by defining producers, processors, and batchers. This example sets up a producer for a specific Pub/Sub subscription and configures batching.

```elixir
defmodule MyBroadway do
  use Broadway

  alias Broadway.Message

  def start_link(_opts) do
    Broadway.start_link(__MODULE__,
      name: __MODULE__,
      producer: [
        module:
          {BroadwayCloudPubSub.Producer,
           subscription: "projects/test-pubsub/subscriptions/test-subscription"}
      ],
      processors: [
        default: []
      ],
      batchers: [
        default: [
          batch_size: 10,
          batch_timeout: 2_000
        ]
      ])
  end

  ...callbacks...
end
```

--------------------------------

### GenStage Producer Example

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/custom-producers.md

A basic GenStage producer that generates a sequence of numbers. This producer generates plain events that require transformation for Broadway.

```elixir
defmodule Counter do
  use GenStage

  def start_link(number) do
    GenStage.start_link(Counter, number)
  end

  def init(counter) do
    {:producer, counter}
  end

  def handle_demand(demand, counter) when demand > 0 do
    events = Enum.to_list(counter..counter+demand-1)
    {:noreply, events, counter + demand}
  end
end
```

--------------------------------

### Enable Pub/Sub API for the project

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Enable the Google Cloud Pub/Sub API for the specified project.

```bash
gcloud services enable pubsub --project test-pubsub
```

--------------------------------

### Create a new Google Cloud Pub/Sub project

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Use the gcloud CLI to create a new Google Cloud project for Pub/Sub integration.

```bash
gcloud projects create test-pubsub
```

--------------------------------

### Create a service account for Pub/Sub

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Create a service account within the Google Cloud project to allow programmatic access to Pub/Sub.

```bash
gcloud iam service-accounts create test-account --project test-pubsub
```

--------------------------------

### Create a new Pub/Sub subscription

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Create a new Pub/Sub subscription linked to a topic in the specified Google Cloud project.

```bash
gcloud pubsub subscriptions create test-subscription --project test-pubsub --topic test-topic
```

--------------------------------

### Create a new Pub/Sub topic

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Create a new Pub/Sub topic within the specified Google Cloud project.

```bash
gcloud pubsub topics create test-topic --project test-pubsub
```

--------------------------------

### Generate service account credentials

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Create a JSON key file for the service account, which will be used for authentication.

```bash
gcloud iam service-accounts keys create credentials.json --iam-account=test-account@test-pubsub.iam.gserviceaccount.com
```

--------------------------------

### Create New Elixir Project with Supervisor

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/apache-kafka.md

Generates a new Elixir project with a supervision tree, essential for robust applications.

```bash
mix new my_app --sup
```

--------------------------------

### Add Broadway Cloud Pub/Sub Dependency

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Add the :broadway_cloud_pub_sub and :goth dependencies to your mix.exs file. Ensure you check for the latest dependency versions.

```elixir
defp deps() do
  [
    ...
    {:broadway_cloud_pub_sub, "~> 0.7"},
    {:goth, "~> 1.0"}
  ]
end
```

--------------------------------

### List RabbitMQ Queues

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/rabbitmq.md

Use rabbitmqctl to list all declared queues in the RabbitMQ instance. This command helps verify if the queue was successfully created.

```bash
$ rabbitmqctl list_queues
Timeout: 60.0 seconds ...
Listing queues for vhost / ...
name      messages
my_queue  0
```

--------------------------------

### Add BroadwaySQS and HTTP Client Dependencies

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/amazon-sqs.md

Add the BroadwaySQS connector and your chosen HTTP client (e.g., hackney) to your project's dependencies in `mix.exs`. Ensure you use the latest compatible versions.

```elixir
def deps do
  [
    ...,
    {:broadway_sqs, "~> 0.7"},
    {:hackney, "~> 1.9"},
  ]
end
```

--------------------------------

### Configure RabbitMQ Connection with Credentials

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/rabbitmq.md

When consuming from a broker that requires authorization, provide credentials using the 'connection' option within the producer configuration.

```elixir
producer: [
  module: {BroadwayRabbitMQ.Producer,
    queue: "my_queue",
    connection: [
      username: "user",
      password: "password",
    ]
    ... 
  }
]
```

--------------------------------

### Publish Test Messages to Pub/Sub

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Publish test messages to a Google Cloud Pub/Sub topic using the `gcloud` command-line tool. This is used to test the Broadway pipeline.

```bash
$ gcloud pubsub topics publish  projects/test-pubsub/topics/test-topic --message "test 1"
```

```bash
gcloud pubsub topics publish  projects/test-pubsub/topics/test-topic --message "test 2"
```

--------------------------------

### Declare RabbitMQ Queue

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/rabbitmq.md

Use rabbitmqadmin to declare a new durable queue named 'my_queue'. Ensure the Management plugin is enabled for rabbitmqadmin.

```bash
$ rabbitmqadmin declare queue name=my_queue durable=true
```

--------------------------------

### Publish Messages to RabbitMQ Queue

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/rabbitmq.md

Generates and publishes 5000 sample messages to a RabbitMQ queue named 'my_queue' for consumption by the Broadway pipeline. Requires the `amqp` library.

```elixir
{:ok, connection} = AMQP.Connection.open
{:ok, channel} = AMQP.Channel.open(connection)
AMQP.Queue.declare(channel, "my_queue", durable: true)

Enum.each(1..5000, fn i ->
  AMQP.Basic.publish(channel, "", "my_queue", "#{i}")
end)
AMQP.Connection.close(connection)
```

--------------------------------

### Add Broadway RabbitMQ Dependency

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/rabbitmq.md

Add the :broadway_rabbitmq dependency to your project's mix.exs file.

```elixir
def deps do
  [
    ...,
    {:broadway_rabbitmq, "~> 0.7"},
  ]
end
```

--------------------------------

### Implement Broadway Callbacks

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/rabbitmq.md

Defines `handle_message` for individual message processing and `handle_batch` for batch processing. Use `handle_message` for simple transformations and `handle_batch` when batch-level operations are needed. Batching is optional since Broadway v0.2.

```elixir
defmodule MyBroadway do
  use Broadway

  alias Broadway.Message

  ...start_link...

  @impl true
  def handle_message(_, message, _) do
    message
    |> Message.update_data(fn data -> {data, String.to_integer(data) * 2} end)
  end

  @impl true
  def handle_batch(_, messages, _, _) do
    list = messages |> Enum.map(fn e -> e.data end)
    IO.inspect(list, label: "Got batch")
    messages
  end
end
```

--------------------------------

### Basic Broadway SQS Producer Configuration

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/amazon-sqs.md

Defines a minimal Broadway pipeline with an Amazon SQS producer. Assumes AWS credentials are set in the environment.

```elixir
defmodule MyBroadway do
  use Broadway

  alias Broadway.Message

  def start_link(_opts) do
    Broadway.start_link(__MODULE__,
      name: __MODULE__,
      producer: [
        module: {BroadwaySQS.Producer,
                 queue_url: "https://us-east-2.queue.amazonaws.com/100000000001/my_queue"}
      ],
      processors: [
        default: []
      ],
      batchers: [
        default: [
          batch_size: 10,
          batch_timeout: 2000
        ]
      ])
  end

  ...callbacks...
end
```

--------------------------------

### Add Broadway to Supervision Tree

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/rabbitmq.md

Integrates the `MyBroadway` pipeline as a child process in the application's supervision tree. Ensure Broadway is listed after its dependencies.

```elixir
children = [
  {MyBroadway, []}
]

Supervisor.start_link(children, strategy: :one_for_one)
```

--------------------------------

### Add IAM policy binding for service account

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/google-cloud-pubsub.md

Grant the 'roles/editor' role to the service account for the Google Cloud project. Review available roles for specific needs.

```bash
gcloud projects add-iam-policy-binding test-pubsub \
    --member serviceAccount:test-account@test-pubsub.iam.gserviceaccount.com \
    --role roles/editor
```

--------------------------------

### Add Broadway to Mix Dependencies

Source: https://github.com/elixir-broadway/broadway/blob/main/README.md

Add the Broadway package to your project's dependencies in the mix.exs file.

```elixir
def deps do
  [
    {:broadway, "~> 1.0"}
  ]
end
```

--------------------------------

### Define Broadway Kafka Producer Configuration

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/apache-kafka.md

This snippet shows how to configure a Broadway pipeline to use BroadwayKafka as a producer. It specifies Kafka connection details, topics, group ID, and concurrency settings for the producer, processors, and batchers.

```elixir
defmodule MyBroadway do
  use Broadway

  alias Broadway.Message

  def start_link(_opts) do
    Broadway.start_link(__MODULE__,
      name: __MODULE__,
      producer: [
        module:
          {BroadwayKafka.Producer,
           [
             hosts: [localhost: 9092],
             group_id: "group_1",
             topics: ["test"]
           ]},
        concurrency: 1
      ],
      processors: [
        default: [
          concurrency: 10
        ]
      ],
      batchers: [
        default: [
          batch_size: 100,
          batch_timeout: 200,
          concurrency: 10
        ]
      ]
    )
  end

  ...callbacks...
end
```

--------------------------------

### Broadway Pipeline with Custom Producer

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/custom-producers.md

Configures a Broadway pipeline to use the custom `Counter` GenStage producer. A transformer function is specified to convert the producer's events into `Broadway.Message` structs.

```elixir
defmodule MyBroadway do
  use Broadway

  @behaviour Broadway.Acknowledger

  alias Broadway.Message

  def start_link(_opts) do
    Broadway.start_link(__MODULE__,
      name: __MODULE__,
      producer: [
        module: {Counter, 1},
        transformer: {__MODULE__, :transform, []}
      ],
      processors: [
        default: [concurrency: 10]
      ],
      batchers: [
        default: [concurrency: 2, batch_size: 5]
      ])
  end

  ...callbacks...

  def transform(event, _opts) do
    %Message{
      data: event,
      acknowledger: {__MODULE__, :ack_id, :ack_data}
    }
  end

  @impl Broadway.Acknowledger
  def ack(:ack_id, successful, failed) do
    # Write ack code here
    :ok
  end
end
```

--------------------------------

### Add BroadwayKafka Dependency

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/apache-kafka.md

Integrates the BroadwayKafka connector into your Elixir project by adding it to the dependencies in mix.exs. Always check for the latest version.

```elixir
def deps do
  [
    ...
    {:broadway_kafka, "~> 0.3"}
  ]
end
```

--------------------------------

### Broadway SQS Producer with Explicit AWS Credentials

Source: https://github.com/elixir-broadway/broadway/blob/main/guides/examples/amazon-sqs.md

Configures the Broadway SQS producer to explicitly pass AWS access key ID and secret access key. Useful when environment variables are not set.

```elixir
producer: [
  module:
    {BroadwaySQS.Producer,
     queue_url: "https://us-east-2.queue.amazonaws.com/100000000001/my_queue",
     config: [
       access_key_id: "YOUR_AWS_ACCESS_KEY_ID",
       secret_access_key: "YOUR_AWS_SECRET_ACCESS_KEY"
     ]}
]
```

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