data structures and layout

master
Avril 4 years ago
commit 48277f62ac
Signed by: flanchan
GPG Key ID: 284488987C31F630

2
.gitignore vendored

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/target
*~

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authors = ["Avril <flanchan@cumallover.me>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
bytes = "0.6.0"
cryptohelpers = {version = "1.7", features = ["full", "async", "serde"]}
generational-arena = "0.2.8"
jemallocator = "0.3.2"
memmap = "0.7.0"
serde = {version = "1.0.118", features= ["derive"]}

@ -0,0 +1,42 @@
use super::*;
/// An open fd that has been memory mapped.
#[derive(Debug)]
pub struct OpenMMap
{
file: File,//note: this layout matters for destruction ordering.
map: Mmap,
}
/// Provides immutable caching of a file in a data entry.
#[derive(Debug)]
pub enum DataCacheState
{
/// There is no file cache for this item.
None,
/// The file is open, we have an fd.
Open(File),
/// The file is not open, but its whole contents have been loaded into memory.
Memory(Bytes), // load from file via `BytesMut` buffer, then call `.freeze()`
/// The file is open and memory mapped.
Mapped(OpenMMap),
}
impl Default for DataCacheState
{
#[inline]
fn default() -> Self
{
Self::None
}
}
impl DataCacheState
{
/// Drop the whole cache (if there is one).
#[inline] pub fn clear(&mut self)
{
*self = Self::None;
}
}

@ -0,0 +1,102 @@
use super::*;
use std::hash::{Hash, Hasher};
use std::borrow::Borrow;
#[derive(Debug, Serialize, Deserialize)] // Clone, PartialEq, Eq, Hash
pub struct Entry
{
name: String,
description: String,
/// The key used to encrypt the file, if any.
key: Option<aes::AesKey>,
/// The hash of the *unencrypted* data.
hash: sha256::Sha256Hash,
/// The tags for this entry.
///
/// # Note
/// This should be updated the same as the `Store`'s `tags` and `tag_mappings`. The duplication here is for lookup convenience / caching.
pub(super) tags: Vec<String>,
/// The *original* filename of the item, *not* the path to the real file for this item (see `location`).
filename: OsString,
/// Filename *relative* to the root of the store
location: PathBuf,
/// The state of caching this entry is currently in. This should not be saved as it has no meaning regarding the actual data itself.
#[serde(skip)]
cache: DataCacheState,
}
impl Entry
{
/// The sha256 hash of the data in this entry
pub fn hash(&self) -> &sha256::Sha256Hash
{
&self.hash
}
}
impl Entry
{
/// Consume and drop the cache. Only that useful as shim for mapping.
#[inline(always)] pub(super) fn with_no_cache(self) -> Self
{
Self {
cache: Default::default(),
..self
}
}
}
impl Borrow<sha256::Sha256Hash> for Entry
{
#[inline] fn borrow(&self) -> &sha256::Sha256Hash
{
&self.hash
}
}
impl Hash for Entry {
fn hash<H: Hasher>(&self, state: &mut H) {
self.hash.hash(state)
}
}
impl PartialEq for Entry
{
fn eq(&self, other: &Self) -> bool
{
macro_rules! eq {
($one:ident) => (self.$one == other.$one);
($($many:ident),*) => {
$(
eq!($many)
)&& *
};
}
eq!(name, description, key, tags, filename, location)
}
}
impl Eq for Entry{}
impl Clone for Entry
{
fn clone(&self) -> Self {
macro_rules! clone {
($($many:ident),*) => {
Self {
cache: Default::default(),
$($many: self.$many.clone()),*
}
}
}
clone!(name, description, key, tags, filename, location, hash)
}
}

@ -0,0 +1,98 @@
use super::*;
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
pub struct Freeze
{
metadata: StoreMetadata,
data: Vec<Entry>,
}
impl Freeze
{
pub(super) fn new_ref(from: &Store) -> Self
{
Self {
metadata: from.metadata.clone(),
data: from.data.iter().map(Entry::clone).collect(),
}
}
pub(super) fn new_moved(from: Store) -> Self
{
Self {
metadata: from.metadata,
data: from.data.into_iter().map(Entry::with_no_cache).collect(),
}
}
pub(super) fn create_new(&self) -> Store
{
let mut new = Store::with_capacity(self.metadata.clone(), self.data.len());
for entry in self.data.iter()
{
let hash = entry.hash().clone();
let hash_idx = new.data_hashes.insert(hash);
// insert the tags
for tag in entry.tags.iter()
{
if let Some(&ti) = new.tags.get(tag) {
// This tag has an entry already, append to it
new.tag_mappings.get_mut(ti).unwrap().push(hash_idx);
} else {
// This tag has no entry, create it
let ti = new.tag_mappings.insert(vec![hash_idx]);
new.tags.insert(tag.clone(), ti);
}
}
new.data.insert(entry.clone());
}
new
}
pub(super) fn into_new(self) -> Store
{
let Freeze { data, metadata } = self;
let mut new = Store::with_capacity(metadata, data.len());
for entry in data.into_iter()
{
let hash = entry.hash().clone();
let hash_idx = new.data_hashes.insert(hash);
// insert the tags
for tag in entry.tags.iter()
{
if let Some(&ti) = new.tags.get(tag) {
// This tag has an entry already, append to it
new.tag_mappings.get_mut(ti).unwrap().push(hash_idx);
} else {
// This tag has no entry, create it
let ti = new.tag_mappings.insert(vec![hash_idx]);
new.tags.insert(tag.clone(), ti);
}
}
new.data.insert(entry);
}
new
}
}
impl From<Store> for Freeze
{
#[inline] fn from(from: Store) -> Self
{
Self::new_moved(from)
}
}
impl From<Freeze> for Store
{
#[inline] fn from(from: Freeze) -> Self
{
from.into_new()
}
}

@ -0,0 +1,15 @@
use super::*;
#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct StoreMetadata
{
pub name: String,
pub root: PathBuf,
}
impl StoreMetadata
{
}

@ -0,0 +1,118 @@
use super::*;
use generational_arena::{
Arena, Index as ArenaIndex,
};
use std::collections::BTreeMap;
use std::collections::HashSet;
use std::path::{Path, PathBuf};
use std::fs::File;
use std::ffi::OsString;
use memmap::Mmap;
use bytes::Bytes;
use cryptohelpers::{aes, sha256};
mod entry;
pub use entry::Entry;
mod cache;
pub use cache::DataCacheState;
mod metadata;
pub use metadata::StoreMetadata;
mod freeze;
pub use freeze::Freeze;
#[derive(Debug)]
pub struct Store
{
metadata: StoreMetadata,
data: HashSet<Entry>, // The entry sha256 hash is used as the `key` here, as `Entry` both hasshes to, and `Borrow`s to `Sha256Hash`.
data_hashes: Arena<sha256::Sha256Hash>, // used to lookup in `data`.
tag_mappings: Arena<Vec<ArenaIndex>>,
tags: BTreeMap<String, ArenaIndex>, // string (tags) -> index (tag_mappings) -> index (data_hashes) -> hash used for lookup (data)
}
// Comptime asserts (TODO: Unneeded. Remove.)
impl Store
{
fn _assert_tag_lookup_works(&self, tag: &str) -> &Entry
{
self.data.get(self.data_hashes.get(*self.tag_mappings.get(*self.tags.get(tag).unwrap()).unwrap().first().unwrap()).unwrap()).unwrap() // y-yes this also works...
}
fn _assert_lookup_internal_works(&self, data_idx: ArenaIndex) -> &Entry
{
self.data.get(self.data_hashes.get(data_idx).unwrap()).unwrap() // yes this works..
}
}
// Creating
impl Store
{
/// Create a new empty store with this metadata.
///
/// # Panics
/// If the root directory specified in `metadata` does not exist or is not a directory.
pub fn new(metadata: StoreMetadata) -> Self
{
assert!(metadata.root.exists() && metadata.root.is_dir(), "Metadata root {:?} passed to `new` not existant or not a directory", metadata.root);
Self {
metadata,
data: HashSet::new(),
data_hashes: Arena::new(),
tag_mappings: Arena::new(),
tags: BTreeMap::new(),
}
}
/// Create a new empty store with this metadata and initial storage capacity
///
/// # Panics
/// If the root directory specified in `metadata` does not exist or is not a directory.
pub fn with_capacity(metadata: StoreMetadata, cap: usize) -> Self
{
assert!(metadata.root.exists() && metadata.root.is_dir(), "Metadata root {:?} passed to `with_capacity` not existant or not a directory", metadata.root);
Self {
metadata,
data: HashSet::with_capacity(cap),
data_hashes: Arena::with_capacity(cap),
tag_mappings: Arena::with_capacity(cap),
tags: BTreeMap::new(),
}
}
}
// Freezing
impl Store
{
/// Create a snapshot of this store, cloning all data into a frozen and serialisable version of it.
/// # Notes
/// This method clones the entire store into the new `Freeze`. To avoid this, use `into_freeze` if the store is no longer used after the freeze.
#[inline] pub fn freeze(&self) -> Freeze
{
Freeze::new_ref(self)
}
/// Consume into a snapshot of this store, moving all data into a frozen and serializable version of it.
#[inline] pub fn into_freeze(self) -> Freeze
{
Freeze::new_moved(self)
}
/// Create a new store instance by cloning from a frozen snapshot of it.
/// # Notes
/// This method clones the entire `Freeze` into the new store. To avoid this, use `from_freeze` if the snapshot is no longer used after the unfreeze.
#[inline] pub fn unfreeze(freeze: &Freeze) -> Self
{
freeze.create_new()
}
/// Consume a store snapshot and move its entries into a new store.
#[inline] pub fn from_freeze(freeze: Freeze) -> Self
{
freeze.into_new()
}
}

@ -0,0 +1,15 @@
#![allow(dead_code)]
use serde::{Serialize, Deserialize};
use jemallocator::Jemalloc;
#[global_allocator]
static GLOBAL: Jemalloc = Jemalloc;
mod data;
fn main() {
println!("Hello, world!");
}
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