flask like asynchronous web framework written in Nim

#nim #flask #webdev

Nim language has great macros supports. Metaprogramming is interesting to play with. Let's look at this asynchronous web framework based on macros route.

https://github.com/planety/starlight

Hello world

import starlight
var app = newApp(newSettings())

proc hello(ctx: Context) {.async, get(app, "/hello").} =
  resp "Hello world!"

app.run()

Vs flask

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

Complex example

import starlight except loginPage
import logging
import htmlgen


func loginPage*(): string =
  return html(form(action = "/login",
      `method` = "post",
      "Username: ", input(name = "username", `type` = "text"),
      "Password: ", input(name = "password", `type` = "password"),
      input(value = "login", `type` = "submit")),
      xmlns = "http://www.w3.org/1999/xhtml")


var app = newApp(newSettings())

proc hello*(ctx: Context) {.async,
  get(app, "/"),
  post(app, "/"),
  get(app, "/hello")
  .} =
  resp "<h1>Hello, Prologue!</h1>"

proc home*(ctx: Context) {.async, route(app, "/home", HttpGet).} =
  resp "<h1>Home</h1>"

proc helloName*(ctx: Context) {.async, get(app, "/hello/{name}").} =
  resp "<h1>Hello, " & ctx.getPathParams("name", "Prologue!") & "</h1>"

proc redirectHome*(ctx: Context) {.async, route(app, "/redirect").} =
  resp redirect("/home")

proc loginGet*(ctx: Context) {.async, route(app, "/loginget").} =
  resp loginGetPage()

proc doLoginGet*(ctx: Context) {.async, route(app, "/loginpage", [HttpGet, HttpPost]).} =
  resp redirect("/hello/Nim")

proc login*(ctx: Context) {.async, get(app, "/login").} =
  resp loginPage()

proc doLogin*(ctx: Context) {.async, post(app, "/login").} =
  resp redirect("/hello/Nim")

app.run()