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"_async-std"] +actix = ["async", "actix-rt", "tokio_02"] +tokio = ["async", "_tokio"] + +[dependencies] +actix-rt = { version = "1.1.1", optional = true } +_async-std = { version = "1.8.0", optional = true, package = "async-std" } +futures-util = { version = "0.3.8", optional = true } +_tokio = { version = "1.0.1", optional = true, package = "tokio", features = ["net"] } +tokio_02 = { version = "0.2.24", optional = true, package = "tokio", features = ["net"] } diff --git a/sqlx-core/src/blocking.rs b/sqlx-core/src/blocking.rs new file mode 100644 index 00000000..8e91d9cf --- /dev/null +++ b/sqlx-core/src/blocking.rs @@ -0,0 +1,6 @@ +//! Types and traits used to implement a database driver with **blocking** I/O. +//! + +pub(crate) mod runtime; + +pub use runtime::Runtime; diff --git a/sqlx-core/src/blocking/runtime.rs b/sqlx-core/src/blocking/runtime.rs new file mode 100644 index 00000000..d4b3c7c7 --- /dev/null +++ b/sqlx-core/src/blocking/runtime.rs @@ -0,0 +1,25 @@ +use std::io; +use std::net::TcpStream; + +/// Describes a set of types and functions used to open and manage +/// resources within SQLx using blocking I/O. +/// +pub trait Runtime { + type TcpStream; + + /// Opens a TCP connection to a remote host at the specified port. + fn connect_tcp(host: &str, port: u16) -> io::Result; +} + +/// Uses the `std::net` primitives to implement a blocking runtime for SQLx. +#[cfg_attr(doc_cfg, doc(cfg(feature = "blocking")))] +#[derive(Debug)] +pub struct Blocking; + +impl Runtime for Blocking { + type TcpStream = TcpStream; + + fn connect_tcp(host: &str, port: u16) -> io::Result { + TcpStream::connect((host, port)) + } +} diff --git a/sqlx-core/src/lib.rs b/sqlx-core/src/lib.rs index 941e0034..a5a253d1 100644 --- a/sqlx-core/src/lib.rs +++ b/sqlx-core/src/lib.rs @@ -1,6 +1,7 @@ //! SQLx Core (`sqlx-core`) is the core set of traits and types that are used and implemented for each //! database driver (`sqlx-postgres`, `sqlx-mysql`, etc.). //! +#![cfg_attr(doc_cfg, feature(doc_cfg))] #![deny(unsafe_code)] #![warn(rust_2018_idioms)] #![warn(future_incompatible)] @@ -16,3 +17,34 @@ #![warn(clippy::use_self)] #![warn(clippy::useless_let_if_seq)] #![allow(clippy::clippy::doc_markdown)] + +// crate renames to allow the feature name "tokio" and "async-std" (as features +// can't directly conflict with dependency names) + +#[cfg(feature = "async-std")] +extern crate _async_std as async_std; + +#[cfg(feature = "tokio")] +extern crate _tokio as tokio; + +#[cfg(feature = "async")] +mod runtime; + +#[cfg(feature = "blocking")] +#[cfg_attr(doc_cfg, doc(cfg(feature = "blocking")))] +pub mod blocking; + +#[cfg(feature = "blocking")] +pub use blocking::runtime::Blocking; + +#[cfg(feature = "async")] +pub use runtime::Runtime; + +#[cfg(all(feature = "async", feature = "async-std"))] +pub use runtime::async_std::AsyncStd; + +#[cfg(all(feature = "async", feature = "tokio"))] +pub use runtime::tokio::Tokio; + +#[cfg(all(feature = "async", feature = "actix"))] +pub use runtime::actix::Actix; diff --git a/sqlx-core/src/runtime.rs b/sqlx-core/src/runtime.rs new file mode 100644 index 00000000..ebbea8b2 --- /dev/null +++ b/sqlx-core/src/runtime.rs @@ -0,0 +1,25 @@ +use std::io; + +use futures_util::future::BoxFuture; + +#[cfg(feature = "async-std")] +pub(crate) mod async_std; + +#[cfg(feature = "actix")] +pub(crate) mod actix; + +#[cfg(feature = "tokio")] +pub(crate) mod tokio; + +/// Describes a set of types and functions used to open and manage +/// resources within SQLx using asynchronous I/O. +#[cfg_attr( + doc_cfg, + doc(cfg(any(feature = "async-std", feature = "tokio", feature = "actix"))) +)] +pub trait Runtime { + type TcpStream; + + /// Opens a TCP connection to a remote host at the specified port. + fn connect_tcp(host: &str, port: u16) -> BoxFuture<'_, io::Result>; +} diff --git a/sqlx-core/src/runtime/actix.rs b/sqlx-core/src/runtime/actix.rs new file mode 100644 index 00000000..fb8c02b0 --- /dev/null +++ b/sqlx-core/src/runtime/actix.rs @@ -0,0 +1,24 @@ +use std::io; + +use actix_rt::net::TcpStream; +use futures_util::{future::BoxFuture, FutureExt}; + +use crate::runtime::Runtime; + +/// Actix SQLx runtime. Uses [`actix-rt`][actix_rt] to provide [`Runtime`]. +/// +/// As of 2021 Jan., Actix re-exports Tokio so this should be equivalent to [`Tokio`][crate::Tokio]. +/// This is split-out to allow Actix to shift, or for it to use a different major Tokio version and +/// still work with SQLx. +/// +#[cfg_attr(doc_cfg, doc(cfg(feature = "actix")))] +#[derive(Debug)] +pub struct Actix; + +impl Runtime for Actix { + type TcpStream = TcpStream; + + fn connect_tcp(host: &str, port: u16) -> BoxFuture<'_, io::Result> { + TcpStream::connect((host, port)).boxed() + } +} diff --git a/sqlx-core/src/runtime/async_std.rs b/sqlx-core/src/runtime/async_std.rs new file mode 100644 index 00000000..fc0df244 --- /dev/null +++ b/sqlx-core/src/runtime/async_std.rs @@ -0,0 +1,28 @@ +use std::io; + +use async_std::{net::TcpStream, task::block_on}; +use futures_util::{future::BoxFuture, FutureExt}; + +use crate::runtime::Runtime; + +/// [`async-std`](async_std) implementation of [`Runtime`]. +#[cfg_attr(doc_cfg, doc(cfg(feature = "async-std")))] +#[derive(Debug)] +pub struct AsyncStd; + +impl Runtime for AsyncStd { + type TcpStream = TcpStream; + + fn connect_tcp(host: &str, port: u16) -> BoxFuture<'_, io::Result> { + TcpStream::connect((host, port)).boxed() + } +} + +#[cfg(feature = "blocking")] +impl crate::blocking::Runtime for AsyncStd { + type TcpStream = TcpStream; + + fn connect_tcp(host: &str, port: u16) -> io::Result { + block_on(::connect_tcp(host, port)) + } +} diff --git a/sqlx-core/src/runtime/tokio.rs b/sqlx-core/src/runtime/tokio.rs new file mode 100644 index 00000000..31ef67a9 --- /dev/null +++ b/sqlx-core/src/runtime/tokio.rs @@ -0,0 +1,22 @@ +use std::io; + +use futures_util::{future::BoxFuture, FutureExt}; +use tokio::net::TcpStream; + +use crate::runtime::Runtime; + +/// Tokio SQLx runtime. Uses [`tokio`] to provide [`Runtime`]. +/// +/// SQLx does not require the use of a multi-threaded executor. +/// +#[cfg_attr(doc_cfg, doc(cfg(feature = "tokio")))] +#[derive(Debug)] +pub struct Tokio; + +impl Runtime for Tokio { + type TcpStream = TcpStream; + + fn connect_tcp(host: &str, port: u16) -> BoxFuture<'_, io::Result> { + TcpStream::connect((host, port)).boxed() + } +} diff --git a/sqlx/Cargo.toml b/sqlx/Cargo.toml index 82868b19..76b8ce1f 100644 --- a/sqlx/Cargo.toml +++ b/sqlx/Cargo.toml @@ -6,8 +6,22 @@ description = "🧰 The Rust SQL Toolkit. An async, pure Rust SQL crate featurin license = "MIT OR Apache-2.0" edition = "2018" readme = "README.md" -keywords = [ "database", "async", "postgres", "mysql", "sqlite" ] -categories = [ "database", "asynchronous" ] +keywords = ["database", "async", "postgres", "mysql", "sqlite"] +categories = ["database", "asynchronous"] authors = [ "LaunchBadge " ] + +[features] +default = [] + +# blocking (std) runtime +blocking = ["sqlx-core/blocking"] + +# async runtimes +async-std = ["sqlx-core/async-std"] +actix = ["sqlx-core/actix"] +tokio = ["sqlx-core/tokio"] + +[dependencies] +sqlx-core = { version = "0.6.0-pre", path = "../sqlx-core" } diff --git a/sqlx/src/lib.rs b/sqlx/src/lib.rs index e8a27414..0176a724 100644 --- a/sqlx/src/lib.rs +++ b/sqlx/src/lib.rs @@ -15,3 +15,18 @@ #![warn(clippy::use_self)] #![warn(clippy::useless_let_if_seq)] #![allow(clippy::clippy::doc_markdown)] + +#[cfg(feature = "blocking")] +pub use sqlx_core::{blocking, Blocking}; + +#[cfg(any(feature = "async-std", feature = "tokio", feature = "actix"))] +pub use sqlx_core::Runtime; + +#[cfg(feature = "async-std")] +pub use sqlx_core::AsyncStd; + +#[cfg(feature = "tokio")] +pub use sqlx_core::Tokio; + +#[cfg(feature = "actix")] +pub use sqlx_core::Actix;