143 lines
3.4 KiB
Rust
143 lines
3.4 KiB
Rust
//! Contains common types and functions related to serialization and integrity
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use rand::Rng;
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use serde::de::{self, Visitor};
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use serde::{Deserialize, Deserializer, Serialize, Serializer};
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use std::fmt;
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/// An array of 32 bytes
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#[derive(Default, Clone, Hash, PartialEq, Eq, PartialOrd, Ord, Copy)]
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pub struct FixedBytes32([u8; 32]);
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impl From<[u8; 32]> for FixedBytes32 {
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fn from(x: [u8; 32]) -> FixedBytes32 {
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FixedBytes32(x)
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}
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}
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impl std::convert::AsRef<[u8]> for FixedBytes32 {
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fn as_ref(&self) -> &[u8] {
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&self.0[..]
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}
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}
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impl fmt::Debug for FixedBytes32 {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", hex::encode(&self.0[..8]))
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}
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}
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struct FixedBytes32Visitor;
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impl<'de> Visitor<'de> for FixedBytes32Visitor {
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type Value = FixedBytes32;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("a byte slice of size 32")
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}
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fn visit_bytes<E: de::Error>(self, value: &[u8]) -> Result<Self::Value, E> {
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if value.len() == 32 {
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let mut res = [0u8; 32];
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res.copy_from_slice(value);
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Ok(res.into())
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} else {
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Err(E::custom(format!(
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"Invalid byte string length {}, expected 32",
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value.len()
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)))
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}
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}
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}
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impl<'de> Deserialize<'de> for FixedBytes32 {
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fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<FixedBytes32, D::Error> {
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deserializer.deserialize_bytes(FixedBytes32Visitor)
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}
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}
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impl Serialize for FixedBytes32 {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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serializer.serialize_bytes(&self.0[..])
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}
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}
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impl FixedBytes32 {
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/// Access the content as a slice
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pub fn as_slice(&self) -> &[u8] {
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&self.0[..]
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}
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/// Access the content as a mutable slice
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pub fn as_slice_mut(&mut self) -> &mut [u8] {
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&mut self.0[..]
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}
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/// Copy to a slice
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pub fn to_vec(self) -> Vec<u8> {
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self.0.to_vec()
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}
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/// Try building a FixedBytes32 from a slice
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/// Return None if the slice is not 32 bytes long
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pub fn try_from(by: &[u8]) -> Option<Self> {
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if by.len() != 32 {
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return None;
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}
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let mut ret = [0u8; 32];
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ret.copy_from_slice(by);
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Some(Self(ret))
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}
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}
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impl From<netapp::NodeID> for FixedBytes32 {
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fn from(node_id: netapp::NodeID) -> FixedBytes32 {
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FixedBytes32::try_from(node_id.as_ref()).unwrap()
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}
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}
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impl From<FixedBytes32> for netapp::NodeID {
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fn from(bytes: FixedBytes32) -> netapp::NodeID {
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netapp::NodeID::from_slice(bytes.as_slice()).unwrap()
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}
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}
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/// A 32 bytes UUID
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pub type Uuid = FixedBytes32;
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/// A 256 bit cryptographic hash, can be sha256 or blake2 depending on provenance
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pub type Hash = FixedBytes32;
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/// Compute the sha256 of a slice
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pub fn sha256sum(data: &[u8]) -> Hash {
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use sha2::{Digest, Sha256};
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let mut hasher = Sha256::new();
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hasher.update(data);
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let mut hash = [0u8; 32];
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hash.copy_from_slice(&hasher.finalize()[..]);
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hash.into()
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}
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/// Compute the blake2 of a slice
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pub fn blake2sum(data: &[u8]) -> Hash {
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use blake2::{Blake2b512, Digest};
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let mut hasher = Blake2b512::new();
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hasher.update(data);
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let mut hash = [0u8; 32];
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hash.copy_from_slice(&hasher.finalize()[..32]);
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hash.into()
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}
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/// A 64 bit non cryptographic hash
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pub type FastHash = u64;
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/// Compute a (non cryptographic) of a slice
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pub fn fasthash(data: &[u8]) -> FastHash {
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use xxhash_rust::xxh3::Xxh3;
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let mut h = Xxh3::new();
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h.update(data);
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h.digest()
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}
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/// Generate a random 32 bytes UUID
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pub fn gen_uuid() -> Uuid {
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rand::thread_rng().gen::<[u8; 32]>().into()
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}
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