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helpers.go.tmpl
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helpers.go.tmpl
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{{- define "helpers" -}}
-- HELPERS
andMap : Decoder a -> Decoder (a -> b) -> Decoder b
andMap =
Decode.map2 (|>)
decodeOptionalField : String -> Decoder a -> Decoder (Maybe a)
decodeOptionalField fieldName decoder =
let
finishDecoding json =
case Decode.decodeValue (Decode.field fieldName Decode.value) json of
Ok _ ->
Decode.map Just (Decode.field fieldName decoder)
Err _ ->
Decode.succeed Nothing
in
Decode.oneOf
[ Decode.field fieldName (Decode.null Nothing)
, Decode.value |> Decode.andThen finishDecoding
]
decodeDict : (String -> Maybe comparable) -> Decoder v -> Decoder (Dict comparable v)
decodeDict toKey valDecoder =
Decode.keyValuePairs valDecoder
|> Decode.andThen (decodeDictFromTuples toKey)
decodeDictFromTuples : (String -> Maybe comparable) -> List ( String, v ) -> Decoder (Dict comparable v)
decodeDictFromTuples toKey tuples =
case tuples of
[] ->
Decode.succeed Dict.empty
( strKey, value ) :: rest ->
case toKey strKey of
Just key ->
decodeDictFromTuples toKey rest
|> Decode.andThen (Dict.insert key value >> Decode.succeed)
Nothing ->
Decode.fail ("failed to decode key: " ++ strKey)
encodeMaybe : (a -> Encode.Value) -> Maybe a -> Encode.Value
encodeMaybe encoder =
Maybe.map encoder >> Maybe.withDefault Encode.null
expectJson : (Result Error a -> msg) -> Decoder a -> Http.Expect msg
expectJson toMsg decoder =
Http.expectStringResponse
toMsg
(\response ->
case response of
Http.BadUrl_ url ->
Err (BadUrl url)
Http.Timeout_ ->
Err Timeout
Http.NetworkError_ ->
Err NetworkError
Http.BadStatus_ metadata body ->
let
contentType =
metadata.headers
|> Dict.get "content-type"
|> Maybe.withDefault ""
in
if String.contains "application/json" contentType then
case Decode.decodeString webrpcErrorDecoder body of
Ok webrpcError ->
Err webrpcError
Err err ->
Err (BadBody (Decode.errorToString err))
else
Err (BadStatus metadata.statusCode)
Http.GoodStatus_ _ body ->
case Decode.decodeString decoder body of
Ok value ->
Ok value
Err err ->
Err (BadBody (Decode.errorToString err))
)
jsonResolver : Decoder a -> Http.Resolver Error a
jsonResolver decoder =
Http.stringResolver
(\ response ->
case response of
Http.BadUrl_ url ->
Err (BadUrl url)
Http.Timeout_ ->
Err Timeout
Http.NetworkError_ ->
Err NetworkError
Http.BadStatus_ metadata body ->
let
contentType =
metadata.headers
|> Dict.get "content-type"
|> Maybe.withDefault ""
in
if String.contains "application/json" contentType then
case Decode.decodeString webrpcErrorDecoder body of
Ok webrpcError ->
Err webrpcError
Err err ->
Err (BadBody (Decode.errorToString err))
else
Err (BadStatus metadata.statusCode)
Http.GoodStatus_ _ body ->
case Decode.decodeString decoder body of
Ok value ->
Ok value
Err err ->
Err (BadBody (Decode.errorToString err))
)
dictStringKey : String -> Maybe String
dictStringKey =
Just
dictIntKey : String -> Maybe Int
dictIntKey =
String.toInt
{{- end -}}