8ee4f308a4
Introduces a new db key "<service>-previous" to track which instance was last selected for a particular service. This allows for filtering the list of available instances to exclude the instance that was last picked, to ensure a (slightly) more even distribution of traffic. There's still the possiblity of the following scenario, however: :service instances > 2 /:service request #1 -> instance #1 /:service request #2 -> instance #2 /:service request #3 -> instance #1 /:service request #4 -> instance #2 where there are many ignored instances for a particular service. One possible solution would be to implement the "<service>-previous" value to be a list, rather than a single value, and push to that list until only one element is left in the original "instance" array after filtering, and then delete the "<service>-previous" key.
70 lines
1.4 KiB
Elixir
70 lines
1.4 KiB
Elixir
defmodule FarsideTest do
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@services_json Application.fetch_env!(:farside, :services_json)
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use ExUnit.Case
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use Plug.Test
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alias Farside.Router
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@opts Router.init([])
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test "/" do
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conn =
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:get
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|> conn("/", "")
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|> Router.call(@opts)
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assert conn.state == :sent
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assert conn.status == 200
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end
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test "/ping" do
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conn =
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:get
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|> conn("/ping", "")
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|> Router.call(@opts)
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assert conn.state == :sent
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assert conn.status == 200
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assert conn.resp_body == "PONG"
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end
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test "/:service" do
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{:ok, file} = File.read(@services_json)
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{:ok, service_list} = Poison.decode(file, as: [%{}])
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service_names =
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Enum.map(
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service_list,
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fn service -> service["type"] end
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)
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IO.puts("")
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Enum.map(service_names, fn service_name ->
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conn =
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:get
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|> conn("/#{service_name}", "")
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|> Router.call(@opts)
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first_redirect = elem(List.last(conn.resp_headers), 1)
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IO.puts(" /#{service_name} (#1) -- #{first_redirect}")
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assert conn.state == :set
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assert conn.status == 302
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conn =
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:get
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|> conn("/#{service_name}", "")
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|> Router.call(@opts)
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second_redirect = elem(List.last(conn.resp_headers), 1)
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IO.puts(" /#{service_name} (#2) -- #{second_redirect}")
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assert conn.state == :set
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assert conn.status == 302
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assert first_redirect != second_redirect
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end)
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end
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end
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