37 releases

0.1.36	Dec 28, 2020
0.1.35	Dec 28, 2020

#1649 in Encoding

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Apache-2.0

17KB
361 lines

Assemble.app Rust Bindings

Bindings to deploy apps to Rust.

Currently implemnted:

Database KV
PubSub

Building a View

Views should return an HTML string from the render method. This string can be constructed however you want, below we use the lightweight templating language, maude.

Events are dispatched by labeling elements with assemble- attributes. For example <button assemble-click="i-was-clicked">Button</button> Will call the event method of your ViewHandler and then the render method. message will be called whenever we recieve a message on the pubsub topic that we subscribe to on our start method. The start method gets called once when the page load and sets the initial state.

It is important that your render method finishes as fast as possible without making any extra calls. All platform functions are disabled during this method.

Example Usage:

#[macro_use]
extern crate assemble_app;
#[macro_use]
extern crate serde;
#[macro_use]
extern crate maud;
use assemble_app::*;
use maud::html;

use serde::{Deserialize, Serialize};
use std::collections::HashMap;

assemble_init! {{
    register_view!(first_view, ViewHandler);
    register_call!(first_call, some_call);
}}

#[derive(Deserialize, Serialize)]
struct Input {
    inp: String,
}

#[derive(Deserialize, Serialize)]
struct Output {
    out: u32,
}

#[derive(Deserialize, Serialize)]
struct ViewHandler {
  clicks: u32,
  other_clicks: u32,
}

impl View for ViewHandler {
  fn start(_params: HashMap<String, String>) -> Result<Self> {
    pubsub_subscribe("clicks")?;
    Ok(ViewHandler { other_clicks: 0, clicks: 0 })
  }

  fn render(&self) -> Result<Html> {
    let markup = html! {
        div class="bg-indigo-700" {
          div class="max-w-2xl mx-auto text-center py-16 px-4 sm:py-20 sm:px-6 lg:px-8" {
            h2 class="text-3xl font-extrabold text-white sm:text-4xl" {
              span class="block" {
                "This page was completely written in rust"
              }
            }
            p class="mt-4 text-lg leading-6 text-indigo-200" {
              "Interact with other tabs by clicking the button below. View the source here: " a href="https://gist.github.com/hansonkd/237de86ab12eed770ebf9c2984bfaa8f" {
                github
              }
            }
            p class="mt-4 text-lg leading-6 text-indigo-200" {
              "Number of clicks from this tab: " (self.clicks)
            }
            p class="mt-4 text-lg leading-6 text-indigo-200" {
              "Number of clicks from other tabs and users: " (self.other_clicks)
            }
            button assemble-click="i-was-clicked" class="mt-8 w-full inline-flex items-center justify-center px-5 py-3 border border-transparent text-base font-medium rounded-md text-indigo-600 bg-white hover:bg-indigo-50 sm:w-auto" {
              "Click me"
            }
          }
        }
    };
    Ok(markup.into_string())
  }

  fn event(&mut self, msg: &str, payload: &[u8]) -> Result<()> {
    // These are clicks from the current user
    pubsub_publish_from("clicks", "click", "")?;
    self.clicks += 1;
    Ok(())
  }

  fn message(&mut self, topic: &str, event: &str, payload: &[u8]) -> Result<()> {
    // These are clicks from other users
    self.other_clicks += 1;
    Ok(())
  }
}

fn some_call(t: &Option<Input>) -> Result<Box<Output>> {
    let output = Output {
        out: 42,
    };
    Ok(Box::new(output))
}

Dependencies

~1.6–2.5MB
~47K SLoC