geeklaunch / blockchain-rust Goto Github PK

This isn't a bug, but just a help. In your code pipe characters formatted like that:

pub fn difficulty_bytes_as_u128 (v: &Vec<u8>) -> u128 {
    ((v[31] as u128) << 0xf * 8) |
    ((v[30] as u128) << 0xe * 8) |
    ((v[29] as u128) << 0xd * 8) |
    ((v[28] as u128) << 0xc * 8) |
    ((v[27] as u128) << 0xb * 8) |
    ((v[26] as u128) << 0xa * 8) |
    ((v[25] as u128) << 0x9 * 8) |
    ((v[24] as u128) << 0x8 * 8) |
    ((v[23] as u128) << 0x7 * 8) |
    ((v[22] as u128) << 0x6 * 8) |
    ((v[21] as u128) << 0x5 * 8) |
    ((v[20] as u128) << 0x4 * 8) |
    ((v[19] as u128) << 0x3 * 8) |
    ((v[18] as u128) << 0x2 * 8) |
    ((v[17] as u128) << 0x1 * 8) |
    ((v[16] as u128) << 0x0 * 8)
}

But in my vscode formatting is that:

pub fn difficulty_bytes_as_u128(v: &Vec<u8>) -> u128 {
    ((v[31] as u128) << 0xf * 8)
        | ((v[30] as u128) << 0xe * 8)
        | ((v[29] as u128) << 0xd * 8)
        | ((v[28] as u128) << 0xc * 8)
        | ((v[27] as u128) << 0xb * 8)
        | ((v[26] as u128) << 0xa * 8)
        | ((v[25] as u128) << 0x9 * 8)
        | ((v[24] as u128) << 0x8 * 8)
        | ((v[23] as u128) << 0x7 * 8)
        | ((v[22] as u128) << 0x6 * 8)
        | ((v[21] as u128) << 0x5 * 8)
        | ((v[20] as u128) << 0x4 * 8)
        | ((v[19] as u128) << 0x3 * 8)
        | ((v[18] as u128) << 0x2 * 8)
        | ((v[17] as u128) << 0x1 * 8)
        | ((v[16] as u128) << 0x0 * 8)
}

I want to format code like yours. How can i do that? Thanks.

I did not understand this code block, can you explain it pls:

pub fn u32_bytes (u: &u32) -> [u8; 4] {
    [
        (u >> 8 * 0x0) as u8,
        (u >> 8 * 0x1) as u8,
        (u >> 8 * 0x2) as u8,
        (u >> 8 * 0x3) as u8,
    ]
}

Hi, thanks for your videos and explanation, I'm studying it to understand better the blockchain, I've a question about this code block:

    pub fn mine (&mut self) {
        for nonce_attempt in 0..(u64::max_value()) {
            self.nonce = nonce_attempt;
            let hash = self.hash();
            if check_difficulty(&hash, self.difficulty) {
                self.hash = hash;
                return;
            }
        }
    }

Here, the hash is created based on the block data and required difficulty, and conceptual wise (if my understood correctly), I should be able to catch any data tampering within the block by recalculating the hash then comparing it with the prev_hash_code in the following block, how can I do this with the code above!!

thanks for your efforts and time , I have a warrning when I run cargo as it couldn't read last hash I couldn't figure the issue that cause the problem as well as Failed to add block: InsufficientInputValue' where should the value stored:
please check the result

warning: value assigned to last_hash is never read
--> src/main.rs:63:5
|
63 | last_hash = block.hash.clone();
| ^^^^^^^^^
|
= note: #[warn(unused_assignments)] on by default
= help: maybe it is overwritten before being read?

warning: hash (bin "blockchain") generated 1 warning
Finished dev [unoptimized + debuginfo] target(s) in 0.12s
Running target/debug/blockchain
Mined genesis block Block[0]: e2937e782fc68a1a0f8f71830f69919136139f6f956fda1e6999f57327070100 at: 1651809036733 with: 1 nonce: 3458
Mined block Block[1]: cb8add22253b754895c232b4ca65f57dcbb42b1ebdb5bd80242e4fdea6b50500 at: 1651809036998 with: 2 nonce: 4312
thread 'main' panicked at 'Failed to add block: InsufficientInputValue', src/main.rs:65:41
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

thanks for the nice topic