Support Mechanical Turk sandbox mode

[4knahs]

Currently the endpoint prefix is hardcoded for mturk:

host = get_host("mturk-requester", client)
...
defp get_host(endpoint_prefix, client) do
    if client.region == "local" do
      "localhost"
    else
      "#{endpoint_prefix}.#{client.region}.#{client.endpoint}"
    end
end

Since there is a sandbox development endpoint, it would be nice to support the "mturk-requester-sandbox" prefix as well.

[4knahs]

The following lines allow passing the prefix through the options:

defp request(client, action, input, options) do
    prefix = Keyword.get(options, :endpoint_prefix, "mturk-requester")
    options = Keyword.delete(options, :endpoint_prefix)
    client = %{client | service: "mturk-requester"}
    host = get_host(prefix, client)
   ...
end

Then, one can pass the prefix like:

AWS.MechanicalTurk.list_h_i_ts(client, %{}, endpoint_prefix: "mturk-requester-sandbox")

Code in: https://github.com/4knahs/aws-elixir/blob/mturk-sandbox/lib/aws/mechanical_turk.ex#L577

[jkakar]

@4knahs Thanks for the report. This project has moved to https://github.com/aws-beam/aws-elixir. Can you please report the issue there?