[WIP] Add rustls support

Cargo.toml

@@ -63,6 +63,10 @@ runtime-actix-native-tls = [ "sqlx-core/runtime-actix-native-tls", "sqlx-macros/
 runtime-async-std-native-tls = [ "sqlx-core/runtime-async-std-native-tls", "sqlx-macros/runtime-async-std-native-tls", "_rt-async-std" ]
 runtime-tokio-native-tls = [ "sqlx-core/runtime-tokio-native-tls", "sqlx-macros/runtime-tokio-native-tls", "_rt-tokio" ]
 
+runtime-actix-rustls = [ "sqlx-core/runtime-actix-rustls", "sqlx-macros/runtime-actix-rustls", "_rt-actix" ]
+runtime-async-std-rustls = [ "sqlx-core/runtime-async-std-rustls", "sqlx-macros/runtime-async-std-rustls", "_rt-async-std" ]
+runtime-tokio-rustls = [ "sqlx-core/runtime-tokio-rustls", "sqlx-macros/runtime-tokio-rustls", "_rt-tokio" ]
+
 # for conditional compilation
 _rt-actix = []
 _rt-async-std = []

README.md

@@ -66,7 +66,7 @@ SQLx is an async, pure Rust<sub>†</sub> SQL crate featuring compile-time check
 
  * **Pure Rust**. The Postgres and MySQL/MariaDB drivers are written in pure Rust using **zero** unsafe<sub>††</sub> code.
 
- * **Runtime Agnostic**. Works on different runtimes ([async-std](https://crates.io/crates/async-std) / [tokio](https://crates.io/crates/tokio) / [actix](https://crates.io/crates/actix-rt)).
+ * **Runtime Agnostic**. Works on different runtimes ([async-std](https://crates.io/crates/async-std) / [tokio](https://crates.io/crates/tokio) / [actix](https://crates.io/crates/actix-rt)) and TLS backends ([native-tls](https://crates.io/crates/native-tls), [rustls](https://crates.io/crates/rustls)).
 
 <sub><sup>† The SQLite driver uses the libsqlite3 C library as SQLite is an embedded database (the only way
 we could be pure Rust for SQLite is by porting _all_ of SQLite to Rust).</sup></sub>
@@ -109,12 +109,14 @@ SQLx is compatible with the [`async-std`], [`tokio`] and [`actix`] runtimes.
 [`tokio`]: https://github.com/tokio-rs/tokio
 [`actix`]: https://github.com/actix/actix-net
 
-By default, you get `async-std`. If you want a different runtime or TLS backend, just disable the default features and activate the corresponding feature, for example for tokio:
+You can also select between [`native-tls`] and [`rustls`] for the TLS backend.
+
+By default, you get `async-std` + `native-tls`. If you want a different runtime or TLS backend, just disable the default features and activate the corresponding feature, for example for tokio + rustls:
 
 ```toml
 # Cargo.toml
 [dependencies]
-sqlx = { version = "0.4.0-beta.1", default-features = false, features = [ "runtime-tokio-native-tls", "macros" ] }
+sqlx = { version = "0.4.0-beta.1", default-features = false, features = [ "runtime-tokio-rustls", "macros" ] }
 ```
 
 <sub><sup>The runtime and TLS backend not being separate feature sets to select is a workaround for a [Cargo issue](https://github.com/rust-lang/cargo/issues/3494).</sup></sub>
@@ -123,10 +125,16 @@ sqlx = { version = "0.4.0-beta.1", default-features = false, features = [ "runti
 
  * `runtime-async-std-native-tls` (on by default): Use the `async-std` runtime and `native-tls` TLS backend.
 
+ * `runtime-async-std-rustls`: Use the `async-std` runtime and `rustls` TLS backend.
+
  * `runtime-tokio-native-tls`: Use the `tokio` runtime and `native-tls` TLS backend.
 
+ * `runtime-tokio-rustls`: Use the `tokio` runtime and `rustls` TLS backend.
+
  * `runtime-actix-native-tls`: Use the `actix` runtime and `native-tls` TLS backend.
 
+ * `runtime-actix-rustls`: Use the `actix` runtime and `rustls` TLS backend.
+
  * `postgres`: Add support for the Postgres database server.
 
  * `mysql`: Add support for the MySQL (and MariaDB) database server.

sqlx-bench/Cargo.toml

@@ -10,6 +10,10 @@ runtime-actix-native-tls = [ "sqlx/runtime-actix-native-tls", "sqlx-rt/runtime-a
 runtime-async-std-native-tls = [ "sqlx/runtime-async-std-native-tls", "sqlx-rt/runtime-async-std-native-tls" ]
 runtime-tokio-native-tls = [ "sqlx/runtime-tokio-native-tls", "sqlx-rt/runtime-tokio-native-tls" ]
 
+runtime-actix-rustls = [ "sqlx/runtime-actix-rustls", "sqlx-rt/runtime-actix-rustls" ]
+runtime-async-std-rustls = [ "sqlx/runtime-async-std-rustls", "sqlx-rt/runtime-async-std-rustls" ]
+runtime-tokio-rustls = [ "sqlx/runtime-tokio-rustls", "sqlx-rt/runtime-tokio-rustls" ]
+
 postgres = ["sqlx/postgres"]
 
 [dependencies]

sqlx-bench/README.md

@@ -24,7 +24,7 @@ You must choose a runtime to execute the benchmarks on; the feature flags are th
 
 ```bash
 cargo bench --features runtime-tokio-native-tls
-cargo bench --features runtime-async-std-native-tls
+cargo bench --features runtime-async-std-rustls
 ```
 
 When complete, the benchmark results will be in `target/criterion/`. 

sqlx-core/Cargo.toml

@@ -38,6 +38,10 @@ runtime-actix-native-tls = [ "sqlx-rt/runtime-actix-native-tls", "_rt-actix" ]
 runtime-async-std-native-tls = [ "sqlx-rt/runtime-async-std-native-tls", "_rt-async-std" ]
 runtime-tokio-native-tls = [ "sqlx-rt/runtime-tokio-native-tls", "_rt-tokio" ]
 
+runtime-actix-rustls = [ "sqlx-rt/runtime-actix-rustls", "_rt-actix" ]
+runtime-async-std-rustls = [ "sqlx-rt/runtime-async-std-rustls", "_rt-async-std" ]
+runtime-tokio-rustls = [ "sqlx-rt/runtime-tokio-rustls", "_rt-tokio" ]
+
 # for conditional compilation
 _rt-actix = []
 _rt-async-std = []

sqlx-macros/Cargo.toml

@@ -24,6 +24,10 @@ runtime-actix-native-tls = [ "sqlx-core/runtime-actix-native-tls", "sqlx-rt/runt
 runtime-async-std-native-tls = [ "sqlx-core/runtime-async-std-native-tls", "sqlx-rt/runtime-async-std-native-tls", "_rt-async-std" ]
 runtime-tokio-native-tls = [ "sqlx-core/runtime-tokio-native-tls", "sqlx-rt/runtime-tokio-native-tls", "_rt-tokio" ]
 
+runtime-actix-rustls = [ "sqlx-core/runtime-actix-rustls", "sqlx-rt/runtime-actix-rustls", "_rt-actix" ]
+runtime-async-std-rustls = [ "sqlx-core/runtime-async-std-rustls", "sqlx-rt/runtime-async-std-rustls", "_rt-async-std" ]
+runtime-tokio-rustls = [ "sqlx-core/runtime-tokio-rustls", "sqlx-rt/runtime-tokio-rustls", "_rt-tokio" ]
+
 # for conditional compilation
 _rt-actix = []
 _rt-async-std = []

sqlx-rt/Cargo.toml

@@ -15,18 +15,25 @@ runtime-actix-native-tls = [ "_rt-actix", "_tls-native-tls", "tokio-native-tls"
 runtime-async-std-native-tls = [ "_rt-async-std", "_tls-native-tls", "async-native-tls" ]
 runtime-tokio-native-tls = [ "_rt-tokio", "_tls-native-tls", "tokio-native-tls" ]
 
+runtime-actix-rustls = [ "_rt-actix", "_tls-rustls", "tokio-rustls" ]
+runtime-async-std-rustls = [ "_rt-async-std", "_tls-rustls", "async-rustls" ]
+runtime-tokio-rustls = [ "_rt-tokio", "_tls-rustls", "tokio-rustls" ]
+
 # Not used directly and not re-exported from sqlx
 _rt-actix = [ "actix-rt", "actix-threadpool", "tokio", "once_cell" ]
 _rt-async-std = [ "async-std" ]
 _rt-tokio = [ "tokio", "once_cell" ]
 _tls-native-tls = [ "native-tls" ]
+_tls-rustls = [ ]
 
 [dependencies]
 async-native-tls = { version = "0.3.3", optional = true }
+async-rustls = { version = "0.1.0", optional = true }
 actix-rt = { version = "1.1.1", optional = true }
 actix-threadpool = { version = "0.3.2", optional = true }
 async-std = { version = "1.6.0", features = [ "unstable" ], optional = true }
 tokio = { version = "0.2.21", optional = true, features = [ "blocking", "stream", "fs", "tcp", "uds", "macros", "rt-core", "rt-threaded", "time", "dns", "io-util" ] }
 tokio-native-tls = { version = "0.1.0", optional = true }
+tokio-rustls = { version = "0.14.0", optional = true }
 native-tls = { version = "0.2.4", optional = true }
 once_cell = { version = "1.4", features = ["std"], optional = true }

sqlx-rt/src/lib.rs

@@ -2,23 +2,29 @@
     feature = "runtime-actix-native-tls",
     feature = "runtime-async-std-native-tls",
     feature = "runtime-tokio-native-tls",
+    feature = "runtime-actix-rustls",
+    feature = "runtime-async-std-rustls",
+    feature = "runtime-tokio-rustls",
 )))]
 compile_error!(
     "one of the features ['runtime-actix-native-tls', 'runtime-async-std-native-tls', \
-     'runtime-tokio-native-tls'] must be enabled"
+     'runtime-tokio-native-tls', 'runtime-actix-rustls', 'runtime-async-std-rustls', \
+     'runtime-tokio-rustls'] must be enabled"
 );
 
 #[cfg(any(
     all(feature = "_rt-actix", feature = "_rt-async-std"),
     all(feature = "_rt-actix", feature = "_rt-tokio"),
     all(feature = "_rt-async-std", feature = "_rt-tokio"),
+    all(feature = "_tls-native-tls", feature = "_tls-rustls"),
 ))]
 compile_error!(
     "only one of ['runtime-actix-native-tls', 'runtime-async-std-native-tls', \
-     'runtime-tokio-native-tls'] can be enabled"
+     'runtime-tokio-native-tls', 'runtime-actix-rustls', 'runtime-async-std-rustls', \
+     'runtime-tokio-rustls'] can be enabled"
 );
 
-#[cfg(all(feature = "_tls-native-tls"))]
+#[cfg(all(feature = "_tls-native-tls", not(feature = "_tls-rustls")))]
 pub use native_tls::{self, Error as TlsError};
 
 //

src/lib.rs

@@ -7,8 +7,8 @@
 ))]
 compile_error!(
     "the features 'runtime-actix', 'runtime-async-std' and 'runtime-tokio' have been removed in
-     favor of new features 'runtime-{rt}-{tls}' where rt is one of 'actix', 'async-std' and
-     'tokio'."
+     favor of new features 'runtime-{rt}-{tls}' where rt is one of 'actix', 'async-std' and 'tokio'
+     and 'tls' is one of 'native-tls' and 'rustls'."
 );
 
 pub use sqlx_core::acquire::Acquire;