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"e367f7a1fb93137af22a3908f00b9a35e2d286a7", + "rev": "0a59cfb77c09f6dd449bd25c2882ad8bb1e203eb", "type": "github" }, "original": { @@ -55,11 +55,11 @@ "nixpkgs": "nixpkgs_2" }, "locked": { - "lastModified": 1710727870, - "narHash": "sha256-Ulsx+t4SnRmjMJx4eF2Li+3rBGYhZp0XNShVjIheCfg=", + "lastModified": 1713406362, + "narHash": "sha256-85f70DM03RWqzahxXChSWcbnUYAKYBDBvyQ4P+kXVBk=", "owner": "oxalica", "repo": "rust-overlay", - "rev": "a1b17cacfa7a6ed18f553a195a047f4e73e95da9", + "rev": "05a4f1b28ee59f589c8a0ad877741de3c3bf894d", "type": "github" }, "original": { diff --git a/flake.nix b/flake.nix index 8c5f6b5..6425682 100644 --- a/flake.nix +++ b/flake.nix @@ -8,14 +8,23 @@ pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [(import oxalica)]; }; in{ devShell."x86_64-linux" = pkgs.mkShell { - buildInputs = with pkgs; [ - (rust-bin.selectLatestNightlyWith (toolchain: toolchain.default.override { - extensions = [ "rust-src" "rustfmt" "rust-analyzer" ]; - })) + buildInputs = with pkgs; + let rust = (rust-bin.selectLatestNightlyWith (toolchain: toolchain.default.override { + extensions = [ "rust-src" "rustfmt" "rust-analyzer" ]; + })); + in [ + rust openssl pkg-config evcxr + llvmPackages_16.clang + llvmPackages_16.libclang ]; + + shellHook = '' + export LIBCLANG_PATH="${pkgs.llvmPackages_16.libclang.lib}/lib"; + export ROCKSDB_LIB_DIR="${pkgs.rocksdb}/lib"; + ''; }; }; } diff --git a/lib/store/Cargo.toml b/lib/store/Cargo.toml index d015c0b..6741542 100644 --- a/lib/store/Cargo.toml +++ b/lib/store/Cargo.toml @@ -7,3 +7,6 @@ path = "src/lib.rs" [dependencies] ulid = "*" +rocksdb = "*" +derive_more = "*" +bincode = "2.0.0-rc.3" diff --git a/lib/store/src/key.rs b/lib/store/src/key.rs index debd525..5c35a91 100644 --- a/lib/store/src/key.rs +++ b/lib/store/src/key.rs @@ -1,27 +1,56 @@ -pub const NODE: usize = 16; -pub const EDGE: usize = NODE * 2; +use crate::{Alias, Result, Transaction}; -#[derive(Clone, Copy)] -pub struct Key([u8; SIZE]); - -impl AsRef<[u8]> for Key { - fn as_ref(&self) -> &[u8] { - self.0.as_ref() - } -} +/// A unique identifier for vertices in the database. +#[derive(Clone, Copy, Eq, PartialEq, Ord, PartialOrd)] +pub struct Key([u8; 16]); impl Key { - pub fn join(self, other: Key) -> Key { - unsafe { std::mem::transmute((self, other)) } + pub(crate) fn from_slice(buf: &[u8]) -> Key { + let mut key = [0; 16]; + key.copy_from_slice(&buf); + Key(key) + } + /// Join two keys together. + pub(crate) fn fuse(self, other: Key) -> [u8; 32] { + let mut buf = [0; 32]; + buf[..16].copy_from_slice(&self.0); + buf[16..].copy_from_slice(&other.0); + buf + } + pub(crate) fn split(buf: &[u8]) -> (Key, Key) { + let tail = Key::from_slice(&buf[..16]); + let head = Key::from_slice(&buf[16..]); + (tail, head) } } -impl Key { - pub fn split(self) -> (Key, Key) { - unsafe { std::mem::transmute_copy(&self.0) } - } - pub fn swap(self) -> Key { - let (l, r) = self.split(); - r.join(l) +impl AsRef<[u8]> for Key { + fn as_ref(&self) -> &[u8] { + &self.0 + } +} + +/// Anything that can be used to reference a vertex, both "normal" [keys](Key) +/// and [aliases](Alias). +/// +/// In general, using a key directly is going to be more efficient than using +/// an alias, because it incurs less lookups. +pub trait Keylike { + /// Translate the thing to a [`Key`]. + fn translate(self, tx: &Transaction<'_>) -> Result; +} + +impl Keylike for Key { + fn translate(self, _: &Transaction<'_>) -> Result { + Ok(self) + } +} + +impl Keylike for A +where + A: Alias, +{ + fn translate(self, tx: &Transaction<'_>) -> Result { + tx.lookup_alias(self) } } diff --git a/lib/store/src/lib.rs b/lib/store/src/lib.rs index 9bc3ba2..9ba4d1c 100644 --- a/lib/store/src/lib.rs +++ b/lib/store/src/lib.rs @@ -1,24 +1,114 @@ -pub struct Store {} +//! The data store abstractions used by the ActivityPuppy project. +//! +//! Persistence in a puppy server is handled by this component, which implements a directed graph +//! inspired datastore on top of the [rocksdb] key-value store. +//! +//! The workflow for manipulating stuff in the store is to open a [`Store`], and then to call +//! its [`transaction`](Store::transaction) method. This method takes a function that, given +//! a [`Transaction`], returns a result with some value. The `Transaction` object contains some +//! useful CRUD methods. Returning an `Ok` commits the transaction and returning `Err` rolls it +//! back. -pub use key::Key; +use std::sync::Arc; + +use derive_more::From; +use rocksdb::MultiThreaded; + +type Backend = rocksdb::TransactionDB; mod key; +mod transaction; -pub mod transaction; +pub use key::{Key, Keylike}; +pub use transaction::Transaction; +pub use {alias::Alias, arrow::Arrow, value::Value}; -/// An (optionally labeled) directed edge between two keys. -pub trait Arrow { - /// Additional data associated with this edge. - type Label; +/// The handle to the data store. +/// +/// This type can be cloned freely. +#[derive(Clone)] +pub struct Store { + inner: Arc, } -/// A simple value associated with a key. -pub trait Value {} +/// An isolated keyspace. +#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)] +pub struct Space(&'static str); -/// Aliases are unique mappings/indices that can be used in place of a key. -/// -/// They typically take the form of a newtype to add semantic meaning. -pub trait Alias {} +impl AsRef for Space { + fn as_ref(&self) -> &str { + &self.0 + } +} + +pub mod value { + //! Modules of information. + + use bincode::{Decode, Encode}; + + use crate::Space; + + /// A simple piece of data associated with a vertex. + pub trait Value: Encode + Decode { + const SPACE: Space; + } + + #[derive(Encode, Decode)] + pub struct Profile {} + + impl Value for Profile { + const SPACE: Space = Space("profile"); + } +} + +pub mod arrow { + //! Relations between nodes. + + use bincode::{Decode, Encode}; + + use crate::Space; + + /// A directed edge between two vertices. + pub trait Arrow: Encode + Decode { + const SPACE: (Space, Space); + } + + /// Which way an arrow is pointing when viewed from a particular vertex. + pub enum Direction { + Incoming, + Outgoing, + } +} + +pub mod alias { + //! Alternative keys. + + use derive_more::{Display, From}; + + use crate::Space; + + /// An alternative unique key for a vertex. + pub trait Alias: ToString + From { + const SPACE: (Space, Space); + } + + #[derive(Display, From)] + pub struct Username(pub String); + + impl Alias for Username { + const SPACE: (Space, Space) = (Space("username/l"), Space("username/r")); + } +} /// Results from this component. -type Result = std::result::Result; +pub type Result = std::result::Result; + +/// Errors from the data store. +#[derive(From, Debug)] +pub enum Error { + Missing, + Conflict, + Internal(rocksdb::Error), + Encoding(bincode::error::EncodeError), + Decoding(bincode::error::DecodeError), +} diff --git a/lib/store/src/transaction.rs b/lib/store/src/transaction.rs index c21c464..aca9a64 100644 --- a/lib/store/src/transaction.rs +++ b/lib/store/src/transaction.rs @@ -1,69 +1,279 @@ -use crate::{Alias, Arrow, Key, Result, Value}; +use std::{collections::HashMap, sync::Arc}; -pub struct Transaction; +use bincode::{Decode, Encode}; +use rocksdb::BoundColumnFamily; -/// Operations on [values][Value]. -impl Transaction { - pub fn lookup_value(&self, key: Key) -> Result<(Key, V)> - where - V: Value, - { - todo!() - } - pub fn insert_value(&self, key: Key) -> Result<()> - where - V: Value, - { - todo!() - } - pub fn update_value(&self, key: Key) -> Result<()> - where - V: Value, - { - todo!() - } - pub fn delete_value(&self, key: Key) -> Result<()> - where - V: Value, - { - todo!() +use crate::{arrow::Direction, Alias, Arrow, Backend, Error, Key, Keylike, Result, Store, Value}; + +const OK: Result<()> = Ok(()); +/// Master list of all column family names in use. +const SPACES: &[&'static str] = &[ + "registry", + "username/l", + "username/r", + "follows/l", + "follows/r", + "profile", +]; + +impl Store { + /// Initiate a transaction. + /// + /// If the result is an error, the transaction is rolled back, and otherwise the transaction + /// is committed. + pub fn transaction(&self, f: impl FnOnce(&Transaction<'_>) -> Result) -> Result { + // Load all the column family handles, because they can't be accessed through the + // `rocksdb::Transaction` struct, only the `TransactionDB`. + let spaces = SPACES + .into_iter() + .map(|name| (*name, self.inner.cf_handle(name).unwrap())) + .collect(); + let tx = Transaction { + inner: self.inner.transaction(), + spaces, + }; + let result = f(&tx); + if result.is_err() { + tx.inner.rollback()?; + } else { + tx.inner.commit()?; + } + result } } -/// Operations on [arrows][Arrow]. -impl Transaction { - pub fn create_arrow(&self, key: (Key, Key), label: A::Label) -> Result<()> - where - A: Arrow, - { - todo!() - } - pub fn delete_arrow(&self, key: (Key, Key)) -> Result<()> - where - A: Arrow, - { - todo!() - } - pub fn arrow_exists(&self, key: (Key, Key)) -> Result - where - A: Arrow, - { - todo!() - } +/// A database transaction, in which either each action succeeds, or everything fails +/// together. +/// +/// The transaction struct is the interface for quering and manipulating persisted content. +pub struct Transaction<'db> { + inner: rocksdb::Transaction<'db, Backend>, + spaces: HashMap<&'static str, Arc>>, } -/// Operations on [aliases][Alias]. -impl Transaction { - pub fn create_alias(&self, key: Key, alias: A) -> Result<()> +impl Transaction<'_> { + /// Register a new key. + pub fn define(&self, key: Key) -> Result<()> { + self.with("registry").set(key, b"")?; + OK + } + /// Query the store for a value associated with the vertex `key` identifies. + /// + /// Using a [`Key`] is more efficient than using an alias. + pub fn lookup(&self, key: impl Keylike) -> Result<(Key, V)> + where + V: Value, + { + let canonicalized_key = key.translate(&self)?; + let raw = self.with(V::SPACE).get(canonicalized_key)?; + let value = decode(raw.as_ref())?; + Ok((canonicalized_key, value)) + } + /// Associate a new value with the key. + /// + /// Returns `Error::Conflict` if a value of this type is already associated with the + /// (canonicalized) key. + pub fn insert(&self, key: impl Keylike, data: V) -> Result<()> + where + V: Value, + { + let key = key.translate(&self)?; + let data = encode(data)?; + let ns = self.with(V::SPACE); + // Check for conflicts. Fail if the key already exists, otherwise set the key + // to the given value. + if ns.has(key)? { + Err(Error::Conflict) + } else { + ns.set(key, data) + } + } + /// Apply an update function to the value identified by the key. + pub fn update(&self, key: impl Keylike, f: impl FnOnce(Key, V) -> Result) -> Result<()> + where + V: Value, + { + let (key, old) = self.lookup::(key)?; + let new = f(key, old).and_then(encode)?; + self.with(V::SPACE).set(key, new) + } + /// Remove a value from the database. Doesn't complain if the value does not exist. + pub fn remove(&self, key: impl Keylike) -> Result> + where + V: Value, + { + let canonical_key = key.translate(&self)?; + let ns = self.with(V::SPACE); + match ns.pop(canonical_key) { + Ok(Some(val)) => decode(&val).map(Some), + Ok(None) => Ok(None), + Err(err) => Err(err), + } + } + /// Look up the key that the given alias maps to. + pub fn lookup_alias(&self, alias: A) -> Result where A: Alias, { - todo!() + let (l, _) = A::SPACE; + let raw = self.with(l).get(alias.to_string())?; + Ok(Key::from_slice(raw.as_ref())) } - pub fn delete_alias(&self, alias: A) + /// Create a new alias of type `A` for the given [`Key`]. + pub fn insert_alias(&self, key: Key, alias: A) -> Result<()> where A: Alias, { - todo!() + let (l, r) = A::SPACE; + let alias = alias.to_string(); + self.with(l).set(&alias, key)?; + self.with(r).set(key, &alias)?; + OK + } + + /// Delete the alias of type `A` that points to `key`. + pub fn remove_alias(&self, key: Key) -> Result<()> + where + A: Alias, + { + let (l, r) = A::SPACE; + // First, pop the reverse mapping, which will give us the encoded + // key for the normal mapping. If it doesn't exist, don't delete + // the normal mapping. + if let Some(alias) = self.with(r).pop(key)? { + self.with(l).pop(alias)?; + } + OK + } + /// Find an arrow of type `A` with the given `tail` and `head`. + pub fn lookup_arrow(&self, (tail, head): (Key, Key)) -> Result> + where + A: Arrow, + { + let (l, _) = A::SPACE; + match self.with(l).get(tail.fuse(head)) { + Ok(raw) => decode(raw.as_ref()), + Err(Error::Missing) => Ok(None), + Err(err) => Err(err), + } + } + /// Create a new arrow of type `A` and associate the label with it. + pub fn insert_arrow(&self, (tail, head): (Key, Key), label: A) -> Result<()> + where + A: Arrow, + { + let (l, r) = A::SPACE; + let label = encode(label)?; + self.with(l).set(tail.fuse(head), &label)?; + self.with(r).set(head.fuse(tail), &label)?; + OK + } + /// Delete an arrow from the data store. + pub fn remove_arrow(&self, (tail, head): (Key, Key)) -> Result<()> + where + A: Arrow, + { + self.with(A::SPACE.0).del(tail.fuse(head))?; + self.with(A::SPACE.1).del(head.fuse(tail))?; + OK + } + /// Select arrows with the given direction relative to the given key. + pub fn list_arrows_with( + &self, + direction: Direction, + key: impl Keylike, + ) -> impl Iterator> + '_ + where + A: Arrow, + { + // Keys in space 0 are arranged with the tail at the start, and the ones in space 1 + // are arranged with the head at the start. This allows us to efficiently prefix scan + // regardless of the direction, at the cost of increased space usage. + let space = match direction { + Direction::Outgoing => A::SPACE.0, + Direction::Incoming => A::SPACE.1, + }; + let key = key.translate(&self).unwrap(); + self.with(space).scan(key).map(|r| { + let (k, v) = r?; + // Because we're prefix scanning on the first half of the key, we only want to + // get the second here. + let (_, other) = Key::split(k.as_ref()); + decode(v.as_ref()).map(|label| (other, label)) + }) + } + /// Use a keyspace. + pub(crate) fn with(&self, name: impl AsRef) -> Keyspace<'_> { + Keyspace { + cf: self.spaces[name.as_ref()].clone(), + tx: &self, + } } } + +/// Provides the basic API for a keyspace/column family. +pub(crate) struct Keyspace<'db> { + tx: &'db Transaction<'db>, + cf: Arc>, +} + +impl<'db> Keyspace<'db> { + /// Retrieve a value from the database. Returns `Missing` if the key does not exist. + pub fn get(&self, key: impl AsRef<[u8]>) -> Result + 'db> { + self.tx + .inner + .get_pinned_cf(&self.cf, key) + .map_err(Error::Internal) + .and_then(|opt| opt.ok_or(Error::Missing)) + } + /// Set the value at `key` to `val`. + pub fn set(&self, key: impl AsRef<[u8]>, val: impl AsRef<[u8]>) -> Result<()> { + self.tx + .inner + .put_cf(&self.cf, key, val) + .map_err(Error::Internal) + } + /// Delete the key-value pair identified by `key`. + pub fn del(&self, key: impl AsRef<[u8]>) -> Result<()> { + self.tx.inner.delete_cf(&self.cf, &key)?; + OK + } + /// Remove the key and associated value from the keyspace, and return its previous value. + pub fn pop(&self, key: impl AsRef<[u8]>) -> Result>> { + let old = self.tx.inner.get_for_update_cf(&self.cf, &key, true)?; + self.del(key)?; + Ok(old) + } + /// Check whether the key exists in the keyspace. + pub fn has(&self, key: impl AsRef<[u8]>) -> Result { + self.tx + .inner + .get_pinned_cf(&self.cf, key) + .map_err(Error::Internal) + .map(|opt| opt.is_some()) + } + /// Execute a prefix scan. + pub fn scan( + &self, + prefix: impl AsRef<[u8]>, + ) -> impl Iterator + 'static, impl AsRef<[u8]> + 'static)>> + 'db + { + self.tx + .inner + .prefix_iterator_cf(&self.cf, prefix) + .map(|r| r.map_err(Error::Internal)) + } +} + +fn encode(data: impl Encode) -> Result> { + bincode::encode_to_vec(data, bincode::config::standard()).map_err(Error::Encoding) +} + +fn decode(data: &[u8]) -> Result +where + T: Decode, +{ + bincode::decode_from_slice(data, bincode::config::standard()) + .map_err(Error::Decoding) + .map(|(v, _)| v) +}