Crate roa_body

An extension crate for roa. This module provides a context extension PowerBody.

Read/write body in a easier way.

The roa_core provides several methods to read/write body.

use roa_core::{Context, Result};
use futures::AsyncReadExt;
use futures::io::BufReader;
use async_std::fs::File;

async fn get(mut ctx: Context<()>) -> Result {
    let mut data = String::new();
    // implements futures::AsyncRead.
    ctx.req.reader().read_to_string(&mut data).await?;
    println!("data: {}", data);

    // although body is empty now...
    let stream = ctx.req.stream();
    ctx.resp
        // echo
       .write_stream(stream)
       // write object implementing futures::AsyncRead
       .write_reader(File::open("assets/author.txt").await?)
       // write `Bytes`
       .write("I am Roa.")
       .write("Hey Roa.");
    Ok(())
}

These methods are useful, but they do not deal with headers, especially Content-* headers.

The PowerBody provides more powerful methods to handle it.

use roa_core::{Context, Result};
use roa_body::{PowerBody, DispositionType::*};
use serde::{Serialize, Deserialize};
use askama::Template;
use async_std::fs::File;
use futures::io::BufReader;

#[derive(Debug, Serialize, Deserialize, Template)]
#[template(path = "user.html")]
struct User {
    id: u64,
    name: String,
}

async fn get(mut ctx: Context<()>) -> Result {
    // deserialize as json.
    let mut user: User = ctx.read_json().await?;

    // deserialize as x-form-urlencoded.
    user = ctx.read_form().await?;

    // serialize object and write it to body,
    // set "Content-Type"
    ctx.write_json(&user)?;

    // open file and write it to body,
    // set "Content-Type" and "Content-Disposition"
    ctx.write_file("assets/welcome.html", Inline).await?;

    // write text,
    // set "Content-Type"
    ctx.write_text("Hello, World!");

    // write object implementing AsyncRead,
    // set "Content-Type"
    ctx.write_octet(File::open("assets/author.txt").await?);

    // render html template, based on [askama](https://github.com/djc/askama).
    // set "Content-Type"
    ctx.render(&user)?;
    Ok(())
}

Enums

DispositionType

Type of content-disposition, inline or attachment

Traits

PowerBody

A context extension to read/write body more simply.