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cuprate-hinto-janai/database
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hinto-janai 331d4d3e7f
Database (#35) 
* rename `database` -> `old_database`

Keeping it around for reference until new implementation is complete.

* create new `database/` skeleton

* add `DATABASE.md` design doc skeleton

* move design doc to `database/README.md`

* add rough code

* `lib.rs` -> `gist.rs`

* database: use workspace deps

* workspace: include `database/` as member

CI will now include this crate.

* cargo fmt

* database: `AGPL` -> `MIT`

* readme: add `TODO`s

* add base files

* cargo.toml: add `heed` feature

* fix clippy

* lib.rs: add extremely pedantic lints

* readme: add `# Backends`

* cargo.toml: add `cfg-if`

* add `backend/` structure

* base `database.rs`

* cargo.toml: add `borsh`

* backend: add `DATABASE_BACKEND`

* base `error.rs`

* base `database.rs`

* base `transaction.rs`

* base `table.rs`

* lib.rs: add imports

* add `pod.rs`

* pod: use `Read/Write`, add tests for all primitive numbers

* pod: impl Pod for `Vec<u8>`, `[u8; N]`

* pod: add docs, add `private::Sealed`

* pod: `to_writer`, `from_reader`

The new `as_bytes` + `from_bytes` now allows (de)serializing from
bytes directly instead of going through Read/Write.

Different array return sizes are abstracted away with `-> impl AsRef<[u8]>`

* pod: impl Pod for `Box<[u8]>`

* pod: return `Err` on incorrect length in `from_bytes()`

* pod: docs

* pod: impl Pod for `Arc<[u8]>`

* readme: docs

* database: add `create_table()`, `get_table()`

* table: `Pod` bound

* backend: move into directories

* pod: add `into_bytes()`

* heed: impl `BytesEncode`, `BytesDecode`

* add `actor`, `service` features

The thread/actor system used will be gated behind `actor`,
and the `tower/tokio` integration will be gated behind `service`.

* add `lib.rs` docs

* service: add `service.rs`

* service: add `reader.rs`

* service: add `writer.rs`

* service: add `request.rs` & `response.rs`

* cargo.toml: add `crossbeam`

* service: add/use `enum Request`, `enum Response`

* service: basic signatures for thread-pools, `Writer` -> `Writers`

* service: split `tower::Service<ReadRequest/WriteRequest>`

* service: impl `tower::Service` for `Database(Reader|Writer)`

* service: add `init()`, impl basic `Reader/Writer` pools

* service: add example `Request`'s

* service: add example `ReadRequest` handling

* temporarily allow clippy lints

* readme: update file structure

* transaction: add `RoTx::get_range()`

* service: module docs

* cargo.toml: add `cuprate-helper`

* service: scale readers/writers based on thread count

* database: change lifetimes

* heed: impl Database for `heed`

* heed: add `ConcreteRoTx`, `ConcreteRwTx`, impl Tx traits

* docs

* service: `read.rs` docs

* service: `write.rs` docs

* service: request/response docs

* service: use `OnceLock` in `init()`, add `db_read()`, `db_write()`

* service: leak database into `&'static`

* database: add `#[inline]`, `#[cold]`

* service: `free.rs` docs, more `#[inline]` + `#[cold]`

* service: add `shutdown()`

* service: add `Request::Shutdown`

* service: `shutdown()` docs

* heed: hide concrete tx types

* lib.rs: add terms

* split `Env` <-> `Database`

* cargo.toml: add `paste`

* database: add `tables/`

* impl `serde/borsh` where possible

* tables: add `Tables`, add test docs

* make db backend mutually exclusive to fix `--all-features`

* tables: use `$()*` in `tables!()`

* cargo.toml: add `sanakirja 1.4.0`

* sanakirja: impl `Env`

* sanakirja: impl `Database`

* sanakirja: impl `Transaction`

* table: temporarily fix `sanakirja` K/V bounds

* table: fix `#[cfg]`

* cargo.toml: fix deps

* lib.rs: docs

* service: docs

* readme: add files, update `# Documentation`, add `# Layers`

* readme: `src/` file purpose

* readme: `src/service/` file purpose

* readme: `src/backend/` file purpose

* fix `Cargo.lock` merge conflict

* database: remove `gist.rs`

* add to `constants.rs`

* add top `//! comments` for files/modules

* constants: add sanity-check test

* service: add `only_one_database` test in `free.rs`

* service: add `tests.rs`

* remove unneeded markers + imports

* backend: fix `get_range()`'s trait `impl` return

* env: add `create_tables_if_needed()`, don't return `Option<Db>`

* sort imports by `CONTRIBUTING.md` rules

oops sorry boog

* add `monero.rs`

* monero: docs

* database: add missing `RoTx/RwTx` inputs

* backend: add missing `RoTx/RwTx` inputs

* `monero.rs` trait -> free functions in `ops/`

* pod: make methods infallible

* ci: add `rustup update` step

* service: use `Arc` instead of leaking, remove `db_read/db_write`

* service: use `InfallibleOneshotReceiver` for readers

* service: shutdown on error, add todos

* service: remove `Request`

* service: combine `ReadResponse` and `WriteResponse`

* service: use `InfallibleOneshotReceiver` for writer

* service: only spawn 1 writer, don't allow cloning writer handle

* table: add associated `const CONSTANT_SIZE`

* add `key.rs` + `trait Key`, add bound to `Table`

* fix typos
2024-02-13 17:43:25 +00:00
..
src Database (#35) 2024-02-13 17:43:25 +00:00
Cargo.toml Database (#35) 2024-02-13 17:43:25 +00:00
README.md Database (#35) 2024-02-13 17:43:25 +00:00

README.md

Database

Cuprate's database implementation.

  1. Documentation
  2. File Structure
  3. Backends
  4. Layers

Documentation

In general, documentation for database/ is split into 3:

Documentation location Purpose
database/README.md High level design of cuprate-database
cuprate-database Practical usage documentation/warnings/notes/etc
Source file // comments Implementation-specific details (e.g, how many reader threads to spawn?)

This README serves as the overview/design document.

For actual practical usage, cuprate-database's types and general usage are documented via standard Rust tooling.

Run:

cargo doc --package cuprate-database --open

at the root of the repo to open/read the documentation.

If this documentation is too abstract, refer to any of the source files, they are heavily commented. There are many // Regular comments that explain more implementation specific details that aren't present here or in the docs. Use the file reference below to find what you're looking for.

The code within src/ is also littered with some grep-able comments containing some keywords:

Word Meaning
INVARIANT This code makes an assumption that must be upheld for correctness
SAFETY This unsafe code is okay, for x,y,z reasons
FIXME This code works but isn't ideal
HACK This code is a brittle workaround
PERF This code is weird for performance reasons
TODO This has to be implemented
SOMEDAY This should be implemented... someday

File Structure

A quick reference of the structure of the folders & files in cuprate-database.

Note that lib.rs/mod.rs files are purely for re-exporting/visibility/lints, and contain no code. Each sub-directory has a corresponding mod.rs.

src/

The top-level src/ files.

File/Folder Purpose
constants.rs General constants used throughout cuprate-database
database.rs Abstracted database; trait Database
env.rs Abstracted database environment; trait Env
error.rs Database error types
free.rs General free functions (related to the database)
key.rs Abstracted database keys; trait Key
pod.rs Data (de)serialization; trait Pod
table.rs Database table abstraction; trait Table
tables.rs All the table definitions used by cuprate-database
transaction.rs Database transaction abstraction; trait RoTx, trait RwTx

src/service/

This folder contains the cupate_database::service module.

File/Folder Purpose
free.rs General free functions used (related to cuprate_database::service)
read.rs Read thread-pool definitions and logic
request.rs Read/write Requests to the database
response.rs Read/write Response's from the database
write.rs Write thread-pool definitions and logic

src/backend/

This folder contains the actual database crates used as the backend for cuprate-database.

Each backend has its own folder.

File/Folder Purpose
heed/ Backend using using forked heed
sanakirja/ Backend using sanakirja

src/backend/heed/

File/Folder Purpose
database.rs Implementation of trait Database
env.rs Implementation of trait Env
serde.rs Data (de)serialization implementations
transaction.rs Implementation of trait RoTx/RwTx

src/backend/sanakirja/

File/Folder Purpose
database.rs Implementation of trait Database
env.rs Implementation of trait Env
transaction.rs Implementation of trait RoTx/RwTx

Backends

cuprate-database's traits abstract over various actual databases.

Each database's implementation is located in its respective file in src/backend/${DATABASE_NAME}.rs.

heed

The default database used is a modified fork of heed, located at Cuprate/heed.

To generate documentation of the fork for local use:

git clone --recursive https://github.com/Cuprate/heed
cargo doc

LMDB should not need to be installed as heed has a build script that pulls it in automatically.

sanakirja

TODO

Layers

TODO: update with accurate information when ready, update image.

Database

Trait

ConcreteDatabase

Thread

Service