purescript-httpurple/docs/Examples/Chunked/Main.purs

module Examples.Chunked.Main where

import Prelude
import Effect.Aff as Aff
import Effect.Class as EffectClass
import Effect.Console as Console
import HTTPure as HTTPure
import Node.ChildProcess as ChildProcess
import Node.Stream as Stream

-- | Run a script and return it's stdout stream
runScript :: String -> Aff.Aff (Stream.Readable ())
runScript script =
  EffectClass.liftEffect $ ChildProcess.stdout
    <$> ChildProcess.spawn "sh" [ "-c", script ] ChildProcess.defaultSpawnOptions

-- | Say 'hello world!' in chunks when run
sayHello :: HTTPure.Request -> HTTPure.ResponseM
sayHello = const $ runScript "echo 'hello '; sleep 1; echo 'world!'" >>= HTTPure.ok

-- | Boot up the server
main :: HTTPure.ServerM
main =
  HTTPure.serve 8080 sayHello do
    Console.log $ " ┌──────────────────────────────────────┐"
    Console.log $ " │ Server now up on port 8080           │"
    Console.log $ " │                                      │"
    Console.log $ " │ To test, run:                        │"
    Console.log $ " │  > curl -Nv localhost:8080           │"
    Console.log $ " │    # => ...                          │"
    Console.log $ " │    # => < Transfer-Encoding: chunked │"
    Console.log $ " │    # => ...                          │"
    Console.log $ " │    # => hello                        │"
    Console.log $ " │    (1 second pause)                  │"
    Console.log $ " │    # => world!                       │"
    Console.log $ " └──────────────────────────────────────┘"