off_broadway_redis_stream

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off_broadway_redis_stream

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A Broadway producer for Redis Stream

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# OffBroadwayRedisStream

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[![docs](https://img.shields.io/badge/docs-hexpm-blue.svg)](https://hexdocs.pm/off_broadway_redis_stream/)

A Redis Stream consumer for [Broadway](https://github.com/dashbitco/broadway).
A Redis Stream consumer implementation for [Broadway](https://github.com/dashbitco/broadway), enabling concurrent processing of Redis Stream messages with built-in fault tolerance and automatic failover.

## Features

- Seamless integration with Broadway for concurrent message processing
- Automatic failover and message recovery when nodes fail
- Configurable consumer groups for distributed processing
- Message retry handling with configurable attempts

It supports failover by automatically claiming pending messages when a node dies. A node is considered dead when it fails to send heartbeats.

## Installation

Add `off_broadway_redis_stream` to your list of dependencies in `mix.exs`:

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

## Usage

### Basic Setup

Here's a complete example demonstrating how to set up a Broadway pipeline with Redis Stream:

```elixir
defmodule MyBroadway do
  use Broadway

def start_link(_opts) do
    Broadway.start_link(__MODULE__,
      name: __MODULE__,
      producer: [
        module:
          {OffBroadwayRedisStream.Producer,
           [
             redis_client_opts: [host: "localhost"],
             stream: "orders",
             group: "processor-group",
             consumer_name: hostname()
           ]}
      ],
      processors: [
        default: [min_demand: 5, max_demand: 1000]
      ]
    )
  end

def handle_message(_, message, _) do
    [_id, key_value_list] = message.data
    IO.inspect(key_value_list, label: "Got message")
    message
  end

@max_attempts 5

def handle_failed(messages, _) do
    for message <- messages do
      if message.metadata.attempt < @max_attempts do
        Broadway.Message.configure_ack(message, retry: true)
      else
        [id, _] = message.data
        IO.inspect(id, label: "Dropping")
      end
    end
  end

defp hostname do
    {:ok, host} = :inet.gethostname()
    to_string(host)
  end
end
```

Check [documentation](https://hex.pm/packages/off_broadway_redis_stream) for more details.

### License

OffBroadwayRedisStream source code is released under Apache License 2.0. Check [LICENSE](LICENSE.md) for more information.

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