ExMessageDB

An Elixir client for Message DB.

Installation

The package can be installed by adding ex_message_db to your list of dependencies in mix.exs:

def deps do
  [
    {:ex_message_db, "~> 0.1.0"}
  ]
end

Configuration

ExMessageDB is an OTP Application and have to be configured by setting the parameters of the ExMessageDB.Repo repo, so that it can connect to the database at start.

# config/config.exs
config :ex_message_db, ExMessageDB.Repo,
  database: "message_store",
  username: "message_store",
  hostname: "localhost"

Usage

The ExMessageDB module provides the methods to access the currently supported server functions.

Supported Server Functions

• write_message
• get_stream_messages (partially)
• get_category_messages (partially)
• get_last_stream_message
• stream_version
• id
• cardinal_id
• category
• is_category
• acquire_lock
• hash_64
• message_store_version

Examples

# write messages to stream "account-1"
iex> message1 = %{
  id: "5e731bdc-07aa-430a-8aae-543b45dd7235",
  stream_name: "account-1",
  type: "Created",
  data: %{name: "New Account"}
}
iex> ExMessageDB.write_message(message1)
{:ok, 0}

iex> message2 = %{
  id: "904ae0d1-8239-4ded-8c34-7bb7f7caefe3",
  stream_name: "account-1",
  type: "EmailAdded"
  data: %{email: "[email protected]"},
}
iex> ExMessageDB.write_message(message1)
{:ok, 1}

# get last message from stream "account-1"
iex> ExMessageDB.get_last_stream_message("account-1")
%{
  message: %ExMessageDB.Message{
    data: %{"email" => "[email protected]"},
    global_position: 2,
    id: "904ae0d1-8239-4ded-8c34-7bb7f7caefe3",
    metadata: nil,
    position: 1,
    stream_name: "account-1",
    time: ~N[2020-06-14 22:39:59.979582],
    type: "EmailAdded"
  }
}

# get messages from stream "account-1"
iex> ExMessageDB.get_stream_messages("account-1")
[
  %{
    message: %ExMessageDB.Message{
      data: %{"name" => "New Account"},
      global_position: 1,
      id: "5e731bdc-07aa-430a-8aae-543b45dd7235",
      metadata: nil,
      position: 0,
      stream_name: "account-1",
      time: ~N[2020-06-14 22:29:47.186470],
      type: "Created"
    }
  },
  %{
    message: %ExMessageDB.Message{
      data: %{"email" => "[email protected]"},
      global_position: 2,
      id: "904ae0d1-8239-4ded-8c34-7bb7f7caefe3",
      metadata: nil,
      position: 1,
      stream_name: "account-1",
      time: ~N[2020-06-14 22:39:59.979582],
      type: "EmailAdded"
    }
  }
]

The documentation can be found at hexdocs.

Copyright and License

Copyright (c) 2020 Jose Miguel Rivero Bruno

The source code is licensed under The MIT License (MIT)