mist

A (hopefully) nice, basic Gleam web server

Installation

This package can be added to your Gleam project:

gleam add mist

and its documentation can be found at https://hexdocs.pm/mist.

Usage

Right now there are 2 options. Let’s say you want a “simple” HTTP server that you can customize to your heart’s content. In that case, you want:

pub fn main() {
  assert Ok(_) = mist.serve(
    8080,
    http.handler(fn(_req) {
      response.new(200)
      // ...
    })
  )
  erlang.sleep_forever()
}

Maybe you also want to work with websockets. Maybe those should only be upgradable at a certain endpoint. For that, you can use the router module. For example:

pub fn main() {
  let my_router =
    router.new([
      Http1(
        ["home"],
        fn(_req) {
          response.new(200)
          |> response.set_body(<<"sup home boy":utf8>>)
        },
      ),
      Websocket(["echo", "test"], websocket.echo_handler),
      Http1(
        ["*"],
        fn(_req) {
          response.new(200)
          |> response.set_body(<<"Hello, world!":utf8>>)
        },
      ),
    ])
  assert Ok(_) = glisten.serve(
    8080,
    my_router,
    router.new_state()
  )
  erlang.sleep_forever()
}

If you need something a little more complex, you can always use the helpers exported by the various glisten/mist modules.

HTTP Hello World

pub fn main() {
  assert Ok(_) = glisten.serve(
    8080,
    http.handler(fn(_req) {
      response.new(200)
      |> response.set_body(<<"hello, world!":utf8>>)
    }),
    Nil
  )
  erlang.sleep_forever()
}

Full HTTP echo handler

pub fn main() {
  let service = fn(req: Request(BitString)) -> Response(BitString) {
    response.new(200)
    |> response.set_body(req.body)
  }
  assert Ok(_) = glisten.serve(
    8080,
    router.new([Http1(["*"], service)]),
    router.new_state(),
  )
  erlang.sleep_forever()
}

Websocket echo handler

pub fn main() {
  assert Ok(_) = glisten.serve(
    8080,
    router.new([Websocket(["echo", "test"], websocket.echo_handler)]),
    router.new_state(),
  )
  erlang.sleep_forever()
}

Benchmarks

These are currently located here