rs-merkle：一个用Rust编写的高级散列树库

let leaf_values = ["a", "b", "c", "d", "e", "f"];
let leaves: Vec<[u8; 32]> = leaf_values
    .iter()
    .map(|x| Sha256::hash(x.as_bytes()))
    .collect();

let merkle_tree = MerkleTree::<Sha256>::from_leaves(&leaves);
let indices_to_prove = vec![3, 4];
let leaves_to_prove = leaves.get(3..5).ok_or("can't get leaves to prove")?;
let merkle_proof = merkle_tree.proof(&indices_to_prove);
let merkle_root = merkle_tree.root().ok_or("couldn't get the merkle root")?;
// Serialize proof to pass it to the client
let proof_bytes = merkle_proof.to_bytes();

// Parse proof back on the client
let proof = MerkleProof::<Sha256>::try_from(proof_bytes)?;

assert!(proof.verify(merkle_root, &indices_to_prove, leaves_to_prove, leaves.len()));

在Rust中使用建造者模式

#[derive(Debug)]
struct User {
    id: String,
    email: String,
    first_name: Option<String>,
    last_name: Option<String>
}

struct UserBuilder {
    id: String,
    email: String,
    first_name: Option<String>,
    last_name: Option<String>
}


impl UserBuilder {
fn new(id: impl Into<String>, email: impl Into<String>) -> Self {
Self {
            id: id.into(),
            email: email.into(),
            first_name: None,
            last_name: None,
        }
    }

fn first_name(mut self, first_name: impl Into<String>) -> Self {
self.first_name = Some(first_name.into());
self
    }

fn last_name(mut self, last_name: impl Into<String>) -> Self {
self.last_name = Some(last_name.into());
self
    }

fn build(self) -> User {
let Self { id, email, first_name, last_name } = self;
        User { id, email, first_name, last_name }
    }
}

impl User {
fn builder(id: impl Into<String>, email: impl Into<String>) -> UserBuilder {
        UserBuilder::new(id, email)
    }
}

fn main() {
let greyblake = User::builder("13","greyblake@example.com")
        .first_name("Sergey")
        .build();
    dbg!(greyblake);
}

1. 使用UserBuilder来创建User结构体；
2. 结构体的必要字段通过必选位置显示传入建造者的new方法，可选参数通过setter来设置；
3. 最后通过build函数返回完整的结构体实例；

sila: 另一个用于团队指导的终端多路复用器。

sila - 读作[shila]，巴利语中代表「道德」；

> help

list                      List the terminal names.
pin     <term1> <term2>   Pin one or multiple terminals separated by space. Following commands will be run on top of pinned ones.
unpin   [term1]           Unpin all terminals if no argument is provided or the specific ones.
count                     Count the number of terminals.
exit                      Close the application.

From 日报小组 odd-cat