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use std::time::{SystemTime, UNIX_EPOCH};
use std::fmt;
use std::collections::HashMap;
use serde::{Serializer, Deserializer, Serialize, Deserialize};
use serde::de::{self, Visitor};
use rand::Rng;
use sha2::{Sha256, Digest};
#[derive(Default, PartialOrd, Ord, Clone, Hash, PartialEq)]
pub struct FixedBytes32([u8; 32]);
impl From<[u8; 32]> for FixedBytes32 {
fn from(x: [u8; 32]) -> FixedBytes32 {
FixedBytes32(x)
}
}
impl std::convert::AsRef<[u8]> for FixedBytes32 {
fn as_ref(&self) -> &[u8] {
&self.0[..]
}
}
impl Eq for FixedBytes32 {}
impl fmt::Debug for FixedBytes32 {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", hex::encode(self.0))
}
}
struct FixedBytes32Visitor;
impl<'de> Visitor<'de> for FixedBytes32Visitor {
type Value = FixedBytes32;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a byte slice of size 32")
}
fn visit_bytes<E: de::Error>(self, value: &[u8]) -> Result<Self::Value, E> {
if value.len() == 32 {
let mut res = [0u8; 32];
res.copy_from_slice(value);
Ok(res.into())
} else {
Err(E::custom(format!("Invalid byte string length {}, expected 32", value.len())))
}
}
}
impl<'de> Deserialize<'de> for FixedBytes32 {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<FixedBytes32, D::Error> {
deserializer.deserialize_bytes(FixedBytes32Visitor)
}
}
impl Serialize for FixedBytes32 {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
serializer.serialize_bytes(&self.0[..])
}
}
impl FixedBytes32 {
pub fn as_slice(&self) -> &[u8] {
&self.0[..]
}
pub fn as_slice_mut(&mut self) -> &mut [u8] {
&mut self.0[..]
}
}
pub type UUID = FixedBytes32;
pub type Hash = FixedBytes32;
pub fn hash(data: &[u8]) -> Hash {
let mut hasher = Sha256::new();
hasher.input(data);
let mut hash = [0u8; 32];
hash.copy_from_slice(&hasher.result()[..]);
hash.into()
}
pub fn gen_uuid() -> UUID {
rand::thread_rng().gen::<[u8; 32]>().into()
}
pub fn now_msec() -> u64 {
SystemTime::now().duration_since(UNIX_EPOCH)
.expect("Fix your clock :o")
.as_millis() as u64
}
// Network management
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct NetworkConfig {
pub members: HashMap<UUID, NetworkConfigEntry>,
pub version: u64,
}
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct NetworkConfigEntry {
pub datacenter: String,
pub n_tokens: u32,
}
// Data management
pub const INLINE_THRESHOLD: usize = 2048;
#[derive(Debug, Serialize, Deserialize)]
pub struct SplitpointMeta {
pub bucket: String,
pub key: String,
pub timestamp: u64,
pub uuid: UUID,
pub deleted: bool,
}
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct VersionMeta {
pub bucket: String,
pub key: String,
pub timestamp: u64,
pub uuid: UUID,
pub mime_type: String,
pub size: u64,
pub is_complete: bool,
pub data: VersionData,
}
#[derive(Clone, Debug, Serialize, Deserialize)]
pub enum VersionData {
DeleteMarker,
Inline(#[serde(with="serde_bytes")] Vec<u8>),
FirstBlock(Hash),
}
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct BlockMeta {
pub version_uuid: UUID,
pub offset: u64,
pub hash: Hash,
}
#[derive(Debug, Serialize, Deserialize)]
pub struct BlockReverseMeta {
pub versions: Vec<UUID>,
pub deleted_versions: Vec<UUID>,
}
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