Failover

Elixir failover library.
Support failover through multiple proxy servers.
Support supervised and not supervised state of redudant servers per client.

Installation

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

def deps do
  [
    {:failover, git: "[email protected]:annatel/failover.git", tag: "0.2.0"}
  ]
end

The docs can be found at https://hexdocs.pm/failover.

Example (not supervised state)

fun = fn %{upstream: url} ->
  response = do_action(url)

  case response do
    {:ok, response} -> {:ok, response}
    {:error, error} -> {:error, %{:upstream, error}}
  end
end

response =
  Failover.call(%{upstream: ["https://master-url.com/api", "https://slave-url.com/api"]}, fun)

case response do
  {:ok, response, updated_state, _state_error} ->
    IO.inspect(response)

  {:error, :upstream, state, state_error} ->
    IO.inspect("All upstream servers are down")
    IO.inspect("Last error is:")
    error = state_error[:upstream] |> List.first
    IO.inspect(elem(error, 1))
end