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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| module EasyRacer.Scenario11 exposing (main) | ||
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| -- Elm does not really have a higher-level racing construct | ||
| -- We are building everything by hand anyway, so this is basically just scenario 6 | ||
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| import EasyRacer.Ports as Ports | ||
| import Http | ||
| import Platform exposing (Program) | ||
| import Set exposing (Set) | ||
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| type alias Flags = | ||
| String | ||
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| type alias Model = | ||
| { inflightTrackers : Set String | ||
| } | ||
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| type Msg | ||
| = HttpResponse String (Result Http.Error String) | ||
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| scenarioPath : String | ||
| scenarioPath = | ||
| "/11" | ||
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| init : Flags -> ( Model, Cmd Msg ) | ||
| init baseUrl = | ||
| let | ||
| requestTrackers = | ||
| [ "first", "second", "third" ] | ||
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| httpRequest tracker = | ||
| { method = "GET" | ||
| , headers = [] | ||
| , url = baseUrl ++ scenarioPath | ||
| , body = Http.emptyBody | ||
| , expect = Http.expectString (HttpResponse tracker) | ||
| , timeout = Nothing | ||
| , tracker = Just tracker | ||
| } | ||
| in | ||
| ( { inflightTrackers = Set.fromList requestTrackers | ||
| } | ||
| , requestTrackers | ||
| |> List.map (Http.request << httpRequest) | ||
| |> Cmd.batch | ||
| ) | ||
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| update : Msg -> Model -> ( Model, Cmd Msg ) | ||
| update msg model = | ||
| case msg of | ||
| HttpResponse tracker httpResult -> | ||
| let | ||
| remainingTrackers : Set String | ||
| remainingTrackers = | ||
| model.inflightTrackers |> Set.remove tracker | ||
| in | ||
| ( { model | inflightTrackers = remainingTrackers } | ||
| , case httpResult of | ||
| Ok bodyText -> | ||
| let | ||
| cancellations : List (Cmd Msg) | ||
| cancellations = | ||
| remainingTrackers | ||
| |> Set.toList | ||
| |> List.map Http.cancel | ||
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| returnResult : Cmd Msg | ||
| returnResult = | ||
| Ok bodyText |> Ports.sendResult | ||
| in | ||
| returnResult :: cancellations |> Cmd.batch | ||
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| Err _ -> | ||
| if not <| Set.isEmpty remainingTrackers then | ||
| Cmd.none | ||
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| else | ||
| Err "all requests completed without a single success response" |> Ports.sendResult | ||
| ) | ||
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| main : Program Flags Model Msg | ||
| main = | ||
| Platform.worker | ||
| { init = init | ||
| , update = update | ||
| , subscriptions = always Sub.none | ||
| } |
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