Crate wtfm_rs_tokio 

Introduction

This is the tokio version of https://wtfm-rs.github.io/doc/wtfm_rs/.

Why do we need a separate repo?

We want to use tokio runtime for async functions. Our minimum Cargo.toml only pulls in tokio crate so that we can write tests and deep dive into the dependencies.

[package]
name = "wtfm-rs-tokio"
version = "0.1.0"
edition = "2024"

[dependencies]
tokio = { version = "1.49.0", features = ["full"] }

% cargo tree
└── tokio v1.49.0
   ├── bytes v1.11.0
   ├── libc v0.2.180
   ├── mio v1.1.1
   │   └── libc v0.2.180
   ├── parking_lot v0.12.5
   │   ├── lock_api v0.4.14
   │   │   └── scopeguard v1.2.0
   │   └── parking_lot_core v0.9.12
   │       ├── cfg-if v1.0.4
   │       ├── libc v0.2.180
   │       └── smallvec v1.15.1
   ├── pin-project-lite v0.2.16
   ├── signal-hook-registry v1.4.8
   │   ├── errno v0.3.14
   │   │   └── libc v0.2.180
   │   └── libc v0.2.180
   ├── socket2 v0.6.2
   │   └── libc v0.2.180
   └── tokio-macros v2.6.0 (proc-macro)
       ├── proc-macro2 v1.0.106
       │   └── unicode-ident v1.0.22
       ├── quote v1.0.44
       │   └── proc-macro2 v1.0.106 (*)
       └── syn v2.0.114
           ├── proc-macro2 v1.0.106 (*)
           ├── quote v1.0.44 (*)
           └── unicode-ident v1.0.22

current thread

tokio::runtime::Builder::new_current_thread()
       .enable_all()
       .build()
       .unwrap()
       .block_on(async {
           assert!(true);
       })

multi-thread

tokio::runtime::Builder::new_multi_thread()
       .enable_all()
       .build()
       .unwrap()
       .block_on(async {
           assert!(true);
       })

tokio::main

use tokio::process::Command;

async fn hello_world() -> String {
   let output = Command::new("echo").arg("Hello,").arg("world!").output();
   let output = output.await.expect("No such file or directory");
   String::from_utf8(output.stdout).expect("Format error")
}
#[tokio::main]
async fn main() {
   assert_eq!(hello_world().await, "Hello, world!\n");
}