mirror of https://github.com/vacp2p/pmtree.git
121 lines
3.1 KiB
Rust
121 lines
3.1 KiB
Rust
use hex_literal::hex;
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use pmtree::*;
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use std::fs;
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use tiny_keccak::{Hasher as _, Keccak};
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struct MyKeccak(Keccak);
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struct MySled(sled::Db);
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#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
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struct MyFr([u8; 32]);
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impl Database for MySled {
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fn new(dbpath: &str) -> Result<Self> {
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let db = sled::open(dbpath).unwrap();
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if db.was_recovered() {
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return Err(Error("Database exists, try load()!".to_string()));
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}
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Ok(MySled(db))
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}
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fn load(dbpath: &str) -> Result<Self> {
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let db = sled::open(dbpath).unwrap();
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if !db.was_recovered() {
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println!("Hello world");
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fs::remove_dir_all(dbpath).expect("Error removing db");
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return Err(Error("Trying to load non-existing database!".to_string()));
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}
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Ok(MySled(db))
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}
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fn get(&self, key: DBKey) -> Result<Option<Value>> {
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Ok(self.0.get(key).unwrap().map(|val| val.to_vec()))
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}
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fn put(&mut self, key: DBKey, value: Value) -> Result<()> {
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self.0.insert(key, value).unwrap();
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self.0.flush().unwrap();
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Ok(())
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}
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}
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impl From<Vec<u8>> for MyFr {
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fn from(v: Vec<u8>) -> Self {
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let v = v.try_into().unwrap();
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MyFr(v)
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}
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}
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impl From<MyFr> for Vec<u8> {
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fn from(v: MyFr) -> Self {
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v.0.to_vec()
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}
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}
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impl Hasher for MyKeccak {
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type Fr = MyFr;
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fn default_leaf() -> Self::Fr {
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MyFr([0; 32])
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}
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fn hash(input: &[Self::Fr]) -> Self::Fr {
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let mut output = [0; 32];
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let mut hasher = Keccak::v256();
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for element in input {
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hasher.update(&element.0);
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}
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hasher.finalize(&mut output);
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MyFr(output)
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}
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}
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#[test]
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fn insert_delete() -> Result<()> {
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let mut mt = MerkleTree::<MySled, MyKeccak>::new(2, "abacaba")?;
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assert_eq!(mt.capacity(), 4);
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assert_eq!(mt.depth(), 2);
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let leaves = [
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hex!("0000000000000000000000000000000000000000000000000000000000000001"),
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hex!("0000000000000000000000000000000000000000000000000000000000000002"),
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hex!("0000000000000000000000000000000000000000000000000000000000000003"),
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hex!("0000000000000000000000000000000000000000000000000000000000000004"),
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];
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let default_tree_root =
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hex!("b4c11951957c6f8f642c4af61cd6b24640fec6dc7fc607ee8206a99e92410d30");
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assert_eq!(mt.root()?, MyFr(default_tree_root));
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let roots = [
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hex!("c1ba1812ff680ce84c1d5b4f1087eeb08147a4d510f3496b2849df3a73f5af95"),
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hex!("893760ec5b5bee236f29e85aef64f17139c3c1b7ff24ce64eb6315fca0f2485b"),
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hex!("222ff5e0b5877792c2bc1670e2ccd0c2c97cd7bb1672a57d598db05092d3d72c"),
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hex!("a9bb8c3f1f12e9aa903a50c47f314b57610a3ab32f2d463293f58836def38d36"),
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];
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for i in 0..leaves.len() {
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mt.update_next(MyFr(leaves[i]))?;
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assert_eq!(mt.root()?, MyFr(roots[i]));
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}
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for i in (0..leaves.len()).rev() {
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mt.delete(i)?;
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}
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assert_eq!(mt.root()?, MyFr(default_tree_root));
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assert!(mt.update_next(MyFr(leaves[0])).is_err());
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fs::remove_dir_all("abacaba").expect("Error removing db");
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Ok(())
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}
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