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//! This module handles the conversion from `Pollable` -> `Future`. We do this
//! by creating an equivalent implementation to the `polling` crate. Once
//! has been resolved, this module
//! will likely no longer be needed.
use slab::Slab;
use std::mem;
use wasi::io::poll::{poll, Pollable};
/// Waits for I/O events.

Concurrency vs Parallelism, in table form

Concurrency is a system-structuring mechanism, parallelism is a resource. (ref)

There's an important distinction between "parallelism" as a resource, and "parallel execution". The two are often confused, but they are in fact distinct. The key separator is "concurrency":

no parallelism has parallelism
no concurrency sequential execution sequential execution †
has concurrency concurrent execution ‡ parallel execution
use crate::headers::{HeaderName, HeaderValue, Headers, ToHeaderValues};
struct CustomHeader {}
impl CustomHeader {
/// Create a new instance of `CustomHeader`.
fn new() -> Self {
PS C:\Users\yoshu\Code\rust> py ./ build
Updating only changed submodules
Submodules updated in 0.26 seconds
Blocking waiting for file lock on package cache
Blocking waiting for file lock on package cache
Finished dev [unoptimized + debuginfo] target(s) in 2.21s
Building stage0 std artifacts (x86_64-pc-windows-msvc -> x86_64-pc-windows-msvc)
Finished release [optimized] target(s) in 0.62s
Copying stage0 std from stage0 (x86_64-pc-windows-msvc -> x86_64-pc-windows-msvc / x86_64-pc-windows-msvc)
Building LLVM for x86_64-pc-windows-msvc
yoshuawuyts /
Created June 29, 2020 19:11 — forked from KodrAus/
Converting between `tracing` key values and `log` key values
use std::fmt;
use log::kv::{self, Source, value::{self, Fill}};
use tracing::{Value, Field, field::{self, Visit}};
pub struct LogField<'kvs>(&'kvs Field, &'kvs dyn Value);
impl fmt::Debug for LogField<'_> {
const { Client } = require('undici')
const client = new Client(`unix:///tmp/hello.sock`)
path: '/',
method: 'GET'
}, function (err, data) {
if (err) throw err
const {


Should have a functioning Rust install already through rustup. This means the Visual Studio 2019 build tools also need to be installed.

Install deps

With winget installed do:

$ winget install python
pub use accept_encoding::Encoding;
use async_compression::stream;
use futures::future::BoxFuture;
use http::{header::CONTENT_ENCODING, status::StatusCode, HeaderMap};
use http_service::Body;
use crate::{
middleware::{Middleware, Next},
yoshuawuyts /
Created September 16, 2019 02:59 — forked from rust-play/
Code shared from the Rust Playground
#[derive(Debug, PartialEq)]
enum State {
Waiting { waiting_time: usize },
Filling { rate: usize },
#[derive(Debug, Clone, Copy)]
enum Event {