initial commit - start here to follow along with the videos

.gitignore

@@ -0,0 +1,3 @@
+/target
+**/*.rs.bk
+Cargo.lock

Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "blockchain-in-rust"
+version = "0.1.0"
+authors = ["Jacob <jacob@geeklaunch.net>"]
+edition = "2018"
+
+[lib]
+name = "blockchainlib"
+path = "src/lib.rs"
+
+[[bin]]
+name = "blockchain"
+path = "src/main.rs"
+
+[dependencies]

src/block.rs

@@ -0,0 +1,13 @@
+use std::fmt::{ self, Debug, Formatter };
+
+pub struct Block {
+}
+
+impl Debug for Block {
+    fn fmt (&self, f: &mut Formatter) -> fmt::Result {
+        write!(f, "Block")
+    }
+}
+
+impl Block {
+}

src/lib.rs

@@ -0,0 +1,63 @@
+type BlockHash = Vec<u8>;
+
+// Credit: https://stackoverflow.com/a/44378174/2773837
+use std::time::{ SystemTime, UNIX_EPOCH };
+
+pub fn now () -> u128 {
+    let duration = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+    ;
+
+    duration.as_secs() as u128 * 1000 + duration.subsec_millis() as u128
+}
+
+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,
+    ]
+}
+
+pub fn u64_bytes (u: &u64) -> [u8; 8] {
+    [
+        (u >> 8 * 0x0) as u8,
+        (u >> 8 * 0x1) as u8,
+        (u >> 8 * 0x2) as u8,
+        (u >> 8 * 0x3) as u8,
+
+        (u >> 8 * 0x4) as u8,
+        (u >> 8 * 0x5) as u8,
+        (u >> 8 * 0x6) as u8,
+        (u >> 8 * 0x7) as u8,
+    ]
+}
+
+pub fn u128_bytes (u: &u128) -> [u8; 16] {
+    [
+        (u >> 8 * 0x0) as u8,
+        (u >> 8 * 0x1) as u8,
+        (u >> 8 * 0x2) as u8,
+        (u >> 8 * 0x3) as u8,
+
+        (u >> 8 * 0x4) as u8,
+        (u >> 8 * 0x5) as u8,
+        (u >> 8 * 0x6) as u8,
+        (u >> 8 * 0x7) as u8,
+
+        (u >> 8 * 0x8) as u8,
+        (u >> 8 * 0x9) as u8,
+        (u >> 8 * 0xa) as u8,
+        (u >> 8 * 0xb) as u8,
+
+        (u >> 8 * 0xc) as u8,
+        (u >> 8 * 0xd) as u8,
+        (u >> 8 * 0xe) as u8,
+        (u >> 8 * 0xf) as u8,
+    ]
+}
+
+mod block;
+pub use crate::block::Block;

src/main.rs

@@ -0,0 +1,3 @@
+fn main () {
+    println!("Hello, blockchain!");
+}