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8dedd9f03c
Implements the new app header syntax as discussed in Zulip [1].
app [main] {
cli: platform "../platform/main.roc",
json: "../json/main.roc"
}
Old headers still parse and are automatically upgraded to the new
syntax by the formatter.
[1] 418444862
81 lines
2.2 KiB
Text
81 lines
2.2 KiB
Text
app [main] { pf: platform "https://github.com/roc-lang/basic-webserver/releases/download/0.1/dCL3KsovvV-8A5D_W_0X_abynkcRcoAngsgF0xtvQsk.tar.br" }
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import pf.Stdout
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import pf.Stderr
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import pf.Task exposing [Task]
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import pf.Http exposing [Request, Response]
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import pf.Utc
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import pf.Env
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main : Request -> Task Response []
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main = \req ->
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handleReq =
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# Log the date, time, method, and url to stdout
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{} <- logRequest req |> Task.await
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# Read environment variable
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url <- readUrlEnv "TARGET_URL" |> Task.await
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# Fetch the Roc website
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content <- fetchContent url |> Task.await
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# Respond with the website content
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respond 200 content
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# Handle any application errors
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handleReq |> Task.onErr handleErr
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AppError : [
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EnvURLNotFound,
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HttpError Http.Error,
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]
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logRequest : Request -> Task {} AppError
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logRequest = \req ->
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dateTime <- Utc.now |> Task.map Utc.toIso8601Str |> Task.await
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Stdout.line "$(dateTime) $(Http.methodToStr req.method) $(req.url)"
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readUrlEnv : Str -> Task Str AppError
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readUrlEnv = \target ->
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Env.var target
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|> Task.mapErr \_ -> EnvURLNotFound
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fetchContent : Str -> Task Str AppError
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fetchContent = \url ->
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Http.getUtf8 url
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|> Task.mapErr \err -> HttpError err
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handleErr : AppError -> Task Response []
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handleErr = \err ->
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# Build error message
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message =
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when err is
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EnvURLNotFound -> "TARGET_URL environment variable not set"
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HttpError _ -> "Http error fetching content"
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# Log error to stderr
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{} <- Stderr.line "Internal Server Error: $(message)" |> Task.await
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_ <- Stderr.flush |> Task.attempt
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# Respond with Http 500 Error
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Task.ok {
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status: 500,
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headers: [
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{ name: "Content-Type", value: Str.toUtf8 "text/html; charset=utf-8" },
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],
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body: Str.toUtf8 "Error 500 Internal Server Error\n",
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}
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# Respond with the given status code and body
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respond : U16, Str -> Task Response AppError
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respond = \code, body ->
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Task.ok {
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status: code,
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headers: [
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{ name: "Content-Type", value: Str.toUtf8 "text/html; charset=utf-8" },
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],
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body: Str.toUtf8 body,
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}
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