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Introduce async database pools: 'rocket_db_pools'. 

This is the async analog of 'rocket_sync_db_pools', rewritten to be
cleaner, leaner, easier to maintain and extend, and better documented.

Resolves #1117.
Resolves #1187.
This commit is contained in:
Sergio Benitez 2021-07-09 16:34:54 -07:00
parent f7f068be11
commit 5b1a04deab
13 changed files with 945 additions and 851 deletions
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63
contrib/db_pools/README.md
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@ -3,58 +3,65 @@
[crates.io]: https://img.shields.io/crates/v/rocket_db_pools.svg [crates.io]: https://img.shields.io/crates/v/rocket_db_pools.svg
[crate]: https://crates.io/crates/rocket_db_pools [crate]: https://crates.io/crates/rocket_db_pools
[docs.svg]: https://img.shields.io/badge/web-master-red.svg?style=flat&label=docs&colorB=d33847 [docs.svg]: https://img.shields.io/badge/web-master-red.svg?style=flat&label=docs&colorB=d33847
[crate docs]: https://api.rocket.rs/master/rocket_db_pools [crate docs]: https://api.rocket.rs/v0.5-rc/rocket_db_pools
[ci.svg]: https://github.com/SergioBenitez/Rocket/workflows/CI/badge.svg [ci.svg]: https://github.com/SergioBenitez/Rocket/workflows/CI/badge.svg
[ci]: https://github.com/SergioBenitez/Rocket/actions [ci]: https://github.com/SergioBenitez/Rocket/actions
This crate provides traits, utilities, and a procedural macro for configuring Asynchronous database driver integration for Rocket. See the [crate docs] for
and accessing database connection pools in Rocket. full usage details.
## Usage ## Usage
First, enable the feature corresponding to your database type: 1. Add `rocket_db_pools` as a dependency with one or more [database driver
features] enabled:
```toml ```toml
[dependencies.rocket_db_pools] [dependencies.rocket_db_pools]
version = "0.1.0-dev" version = "0.1.0-rc"
features = ["sqlx_sqlite"] features = ["sqlx_sqlite"]
``` ```
A full list of supported databases and their associated feature names is 2. Choose a name for your database, here `sqlite_logs`. [Configure] _at least_ a
available in the [crate docs]. In whichever configuration source you choose, URL for the database:
configure a `databases` dictionary with a key for each database, here
`sqlite_logs` in a TOML source:
```toml ```toml
[default.databases] [default.databases.sqlite_logs]
sqlite_logs = { url = "/path/to/database.sqlite" } url = "/path/to/database.sqlite"
``` ```
In your application's source code: 3. [Derive `Database`] for a unit type (`Logs` here) which
wraps the selected driver's [`Pool`] type and is decorated with
`#[database("name")]`. Attach `Type::init()` to your application's `Rocket`
to initialize the database pool:
```rust ```rust
#[macro_use] extern crate rocket; use rocket_db_pools::{Database, Connection};
use rocket::serde::json::Json;
use rocket_db_pools::{Database, sqlx};
#[derive(Database)] #[derive(Database)]
#[database("sqlite_logs")] #[database("sqlite_logs")]
struct LogsDb(sqlx::SqlitePool); struct Logs(sqlx::SqlitePool);
type LogsDbConn = <LogsDb as Database>::Connection;
#[get("/logs/<id>")]
async fn get_logs(mut db: LogsDbConn, id: usize) -> Result<Json<Vec<String>>> {
let logs = sqlx::query!("SELECT text FROM logs;").execute(&mut *db).await?;
Ok(Json(logs))
}
#[launch] #[launch]
fn rocket() -> _ { fn rocket() -> _ {
rocket::build().attach(LogsDb::fairing()) rocket::build().attach(Logs::init())
} }
``` ```
See the [crate docs] for full details. 4. Use [`Connection<Type>`] as a request guard to retrieve an
active database connection:
```rust
#[get("/<id>")]
async fn read(mut db: Connection<Logs>, id: i64) -> Result<Log> {
sqlx::query!("SELECT content FROM logs WHERE id = ?", id)
.fetch_one(&mut *db)
.map_ok(|r| Log(r.content))
.await
}
```
[database driver features]: https://api.rocket.rs/v0.5-rc/rocket_db_pools/index.html#supported-drivers
[`Pool`]: https://api.rocket.rs/v0.5-rc/rocket_db_pools/index.html#supported-drivers
[Configure]: https://api.rocket.rs/v0.5-rc/rocket_db_pools/index.html#configuration
[Derive `Database`]: https://api.rocket.rs/v0.5-rc/rocket_db_pools/derive.Database.html
[`Connection<Type>`]: https://api.rocket.rs/v0.5-rc/rocket_db_pools/struct.Connection.html

6
contrib/db_pools/codegen/Cargo.toml
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@ -1,6 +1,6 @@
[package] [package]
name = "rocket_db_pools_codegen" name = "rocket_db_pools_codegen"
version = "0.1.0-dev" version = "0.1.0-rc"
authors = ["Sergio Benitez <sb@sergio.bz>", "Jeb Rosen <jeb@jebrosen.com>"] authors = ["Sergio Benitez <sb@sergio.bz>", "Jeb Rosen <jeb@jebrosen.com>"]
description = "Procedural macros for rocket_db_pools." description = "Procedural macros for rocket_db_pools."
repository = "https://github.com/SergioBenitez/Rocket/contrib/db_pools" repository = "https://github.com/SergioBenitez/Rocket/contrib/db_pools"
@ -15,3 +15,7 @@ proc-macro = true
[dependencies] [dependencies]
devise = "0.3" devise = "0.3"
quote = "1" quote = "1"
[dev-dependencies]
rocket = { path = "../../../core/lib", default-features = false }
rocket_db_pools = { path = "../lib", features = ["deadpool_postgres"] }

110
contrib/db_pools/codegen/src/database.rs
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@ -2,7 +2,10 @@ use proc_macro::TokenStream;
use devise::{DeriveGenerator, FromMeta, MapperBuild, Support, ValidatorBuild}; use devise::{DeriveGenerator, FromMeta, MapperBuild, Support, ValidatorBuild};
use devise::proc_macro2_diagnostics::SpanDiagnosticExt; use devise::proc_macro2_diagnostics::SpanDiagnosticExt;
use devise::syn::{Fields, spanned::Spanned}; use devise::syn::{self, spanned::Spanned};
const ONE_DATABASE_ATTR: &str = "missing `#[database(\"name\")]` attribute";
const ONE_UNNAMED_FIELD: &str = "struct must have exactly one unnamed field";
#[derive(Debug, FromMeta)] #[derive(Debug, FromMeta)]
struct DatabaseAttribute { struct DatabaseAttribute {
@ -10,61 +13,92 @@ struct DatabaseAttribute {
name: String, name: String,
} }
const ONE_DATABASE_ATTR: &str = "`Database` derive requires exactly one \
`#[database(\"\")] attribute`";
const ONE_UNNAMED_FIELD: &str = "`Database` derive can only be applied to \
structs with exactly one unnamed field";
pub fn derive_database(input: TokenStream) -> TokenStream { pub fn derive_database(input: TokenStream) -> TokenStream {
DeriveGenerator::build_for(input, quote!(impl rocket_db_pools::Database)) DeriveGenerator::build_for(input, quote!(impl rocket_db_pools::Database))
.support(Support::TupleStruct) .support(Support::TupleStruct)
.validator(ValidatorBuild::new() .validator(ValidatorBuild::new()
.struct_validate(|_, struct_| { .struct_validate(|_, s| {
if struct_.fields.len() == 1 { if s.fields.len() == 1 {
Ok(()) Ok(())
} else { } else {
return Err(struct_.fields.span().error(ONE_UNNAMED_FIELD)) Err(s.fields.span().error(ONE_UNNAMED_FIELD))
} }
}) })
) )
.inner_mapper(MapperBuild::new()
.try_struct_map(|_, struct_| {
let krate = quote_spanned!(struct_.span() => ::rocket_db_pools);
let db_name = match DatabaseAttribute::one_from_attrs("database", &struct_.attrs)? {
Some(attr) => attr.name,
None => return Err(struct_.span().error(ONE_DATABASE_ATTR)),
};
let fairing_name = format!("'{}' Database Pool", db_name);
let pool_type = match &struct_.fields {
Fields::Unnamed(f) => &f.unnamed[0].ty,
_ => unreachable!("Support::TupleStruct"),
};
Ok(quote_spanned! { struct_.span() =>
const NAME: &'static str = #db_name;
type Pool = #pool_type;
fn fairing() -> #krate::Fairing<Self> {
#krate::Fairing::new(#fairing_name)
}
fn pool(&self) -> &Self::Pool { &self.0 }
})
})
)
.outer_mapper(MapperBuild::new() .outer_mapper(MapperBuild::new()
.try_struct_map(|_, struct_| { .struct_map(|_, s| {
let decorated_type = &struct_.ident; let decorated_type = &s.ident;
let pool_type = match &struct_.fields { let pool_type = match &s.fields {
Fields::Unnamed(f) => &f.unnamed[0].ty, syn::Fields::Unnamed(f) => &f.unnamed[0].ty,
_ => unreachable!("Support::TupleStruct"), _ => unreachable!("Support::TupleStruct"),
}; };
Ok(quote_spanned! { struct_.span() => quote_spanned! { s.span() =>
impl From<#pool_type> for #decorated_type { impl From<#pool_type> for #decorated_type {
fn from(pool: #pool_type) -> Self { fn from(pool: #pool_type) -> Self {
Self(pool) Self(pool)
} }
} }
impl std::ops::Deref for #decorated_type {
type Target = #pool_type;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl std::ops::DerefMut for #decorated_type {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
#[rocket::async_trait]
impl<'r> rocket::request::FromRequest<'r> for &'r #decorated_type {
type Error = ();
async fn from_request(
req: &'r rocket::request::Request<'_>
) -> rocket::request::Outcome<Self, Self::Error> {
match #decorated_type::fetch(req.rocket()) {
Some(db) => rocket::outcome::Outcome::Success(db),
None => rocket::outcome::Outcome::Failure((
rocket::http::Status::InternalServerError, ()))
}
}
}
impl rocket::Sentinel for &#decorated_type {
fn abort(rocket: &rocket::Rocket<rocket::Ignite>) -> bool {
#decorated_type::fetch(rocket).is_none()
}
}
}
})
)
.outer_mapper(quote!(#[rocket::async_trait]))
.inner_mapper(MapperBuild::new()
.try_struct_map(|_, s| {
let db_name = DatabaseAttribute::one_from_attrs("database", &s.attrs)?
.map(|attr| attr.name)
.ok_or_else(|| s.span().error(ONE_DATABASE_ATTR))?;
let fairing_name = format!("'{}' Database Pool", db_name);
let pool_type = match &s.fields {
syn::Fields::Unnamed(f) => &f.unnamed[0].ty,
_ => unreachable!("Support::TupleStruct"),
};
Ok(quote_spanned! { s.span() =>
type Pool = #pool_type;
const NAME: &'static str = #db_name;
fn init() -> rocket_db_pools::Initializer<Self> {
rocket_db_pools::Initializer::with_name(#fairing_name)
}
}) })
}) })
) )

62
contrib/db_pools/codegen/src/lib.rs
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@ -1,41 +1,61 @@
#![recursion_limit="256"] #![recursion_limit="256"]
#![warn(rust_2018_idioms)] #![warn(rust_2018_idioms)]
//! # `rocket_databases` - Code Generation //! # `rocket_db_pool` - Code Generation
//! //!
//! This crate implements the code generation portion of the `rocket_databases` //! Implements the code generation portion of the `rocket_db_pool` crate. This
//! crate. //! is an implementation detail. This create should never be depended on
//! directly.
#[macro_use] extern crate quote; #[macro_use] extern crate quote;
mod database; mod database;
use proc_macro::TokenStream; /// Automatic derive for the [`Database`] trait.
///
/// Defines a database type and implements [`Database`] on it. /// ```rust
/// use rocket_db_pools::Database;
/// # type PoolType = rocket_db_pools::deadpool_postgres::Pool;
/// ///
/// ```ignore
/// #[derive(Database)] /// #[derive(Database)]
/// #[database("database_name")] /// #[database("database_name")]
/// struct Db(PoolType); /// struct Db(PoolType);
/// ``` /// ```
/// ///
/// `PoolType` must implement [`Pool`]. /// The derive generates an implementation of [`Database`] as follows:
/// ///
/// This macro generates the following code, implementing the [`Database`] trait /// * [`Database::NAME`] is set to the value in the `#[database("name")]`
/// on the struct. Custom implementations of `Database` should usually also /// attribute.
/// start with roughly this code:
/// ///
/// ```ignore /// This names the database, providing an anchor to configure the database via
/// impl Database for Db { /// `Rocket.toml` or any other configuration source. Specifically, the
/// const NAME: &'static str = "config_name"; /// configuration in `databases.name` is used to configure the driver.
/// type Pool = PoolType; ///
/// fn fairing() -> Fairing<Self> { Fairing::new(|p| Self(p)) } /// * [`Database::Pool`] is set to the wrapped type: `PoolType` above. The type
/// fn pool(&self) -> &Self::Pool { &self.0 } /// must implement [`Pool`].
/// } ///
/// ``` /// To meet the required [`Database`] supertrait bounds, this derive also
/// generates implementations for:
///
/// * `From<Db::Pool>`
///
/// * `Deref<Target = Db::Pool>`
///
/// * `DerefMut<Target = Db::Pool>`
///
/// * `FromRequest<'_> for &Db`
///
/// * `Sentinel for &Db`
///
/// The `Deref` impls enable accessing the database pool directly from
/// references `&Db` or `&mut Db`. To force a dereference to the underlying
/// type, use `&db.0` or `&**db` or their `&mut` variants.
///
/// [`Database`]: ../rocket_db_pools/trait.Database.html
/// [`Database::NAME`]: ../rocket_db_pools/trait.Database.html#associatedconstant.NAME
/// [`Database::Pool`]: ../rocket_db_pools/trait.Database.html#associatedtype.Pool
/// [`Pool`]: ../rocket_db_pools/trait.Pool.html
#[proc_macro_derive(Database, attributes(database))] #[proc_macro_derive(Database, attributes(database))]
pub fn derive_database(input: TokenStream) -> TokenStream { pub fn derive_database(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
crate::database::derive_database(input) crate::database::derive_database(input)
} }

64
contrib/db_pools/lib/Cargo.toml
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@ -1,6 +1,6 @@
[package] [package]
name = "rocket_db_pools" name = "rocket_db_pools"
version = "0.1.0-dev" version = "0.1.0-rc"
authors = ["Sergio Benitez <sb@sergio.bz>", "Jeb Rosen <jeb@jebrosen.com>"] authors = ["Sergio Benitez <sb@sergio.bz>", "Jeb Rosen <jeb@jebrosen.com>"]
description = "Rocket async database pooling support" description = "Rocket async database pooling support"
repository = "https://github.com/SergioBenitez/Rocket/contrib/db_pools" repository = "https://github.com/SergioBenitez/Rocket/contrib/db_pools"
@ -9,32 +9,64 @@ keywords = ["rocket", "framework", "database", "pools"]
license = "MIT OR Apache-2.0" license = "MIT OR Apache-2.0"
edition = "2018" edition = "2018"
[package.metadata.docs.rs]
all-features = true
[features] [features]
deadpool_postgres = ["deadpool-postgres"] # deadpool features
deadpool_redis = ["deadpool-redis"] deadpool_postgres = ["deadpool-postgres", "deadpool"]
deadpool_redis = ["deadpool-redis", "deadpool"]
# sqlx features
sqlx_mysql = ["sqlx", "sqlx/mysql"] sqlx_mysql = ["sqlx", "sqlx/mysql"]
sqlx_postgres = ["sqlx", "sqlx/postgres"] sqlx_postgres = ["sqlx", "sqlx/postgres"]
sqlx_sqlite = ["sqlx", "sqlx/sqlite"] sqlx_sqlite = ["sqlx", "sqlx/sqlite"]
sqlx_mssql = ["sqlx", "sqlx/mssql"]
[dependencies] sqlx_macros = ["sqlx/macros"]
rocket_db_pools_codegen = { path = "../codegen" } # implicit features: mongodb
# integration-specific
deadpool-postgres = { version = "0.9", default-features = false, optional = true }
deadpool-redis = { version = "0.8", default-features = false, optional = true }
mongodb = { version = "1", default-features = false, features = ["tokio-runtime"], optional = true }
mysql_async = { version = "0.27", default-features = false, optional = true }
redis = { version = "0.20", default-features = false, features = ["aio", "tokio-comp"] }
sqlx = { version = "0.5", default-features = false, features = ["runtime-tokio-rustls"], optional = true }
[dependencies.rocket] [dependencies.rocket]
path = "../../../core/lib" path = "../../../core/lib"
version = "0.5.0-rc.1"
default-features = false default-features = false
[package.metadata.docs.rs] [dependencies.rocket_db_pools_codegen]
all-features = true path = "../codegen"
version = "0.1.0-rc"
[dependencies.deadpool]
version = "0.8"
default-features = false
features = ["rt_tokio_1", "managed"]
optional = true
[dependencies.deadpool-postgres]
version = "0.9"
default-features = false
features = ["rt_tokio_1"]
optional = true
[dependencies.deadpool-redis]
version = "0.8.1"
default-features = false
features = ["rt_tokio_1"]
optional = true
[dependencies.mongodb]
version = "1"
default-features = false
features = ["tokio-runtime"]
optional = true
[dependencies.sqlx]
version = "0.5"
default-features = false
features = ["runtime-tokio-rustls"]
optional = true
[dev-dependencies.rocket] [dev-dependencies.rocket]
path = "../../../core/lib" path = "../../../core/lib"
default-features = false default-features = false
features = ["json"] features = ["json"]
[build-dependencies]
version_check = "0.9"

115
contrib/db_pools/lib/src/config.rs
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@ -1,64 +1,83 @@
use rocket::figment::{self, Figment, providers::Serialized};
use rocket::serde::{Deserialize, Serialize}; use rocket::serde::{Deserialize, Serialize};
use rocket::{Build, Rocket};
/// A base `Config` for any `Pool` type. /// Base configuration for all database drivers.
/// ///
/// For the following configuration: /// A dictionary matching this structure is extracted from the active
/// [`Figment`](crate::figment::Figment), scoped to `databases.name`, where
/// `name` is the name of the database, by the
/// [`Initializer`](crate::Initializer) fairing on ignition and used to
/// configure the relevant database and database pool.
///
/// With the default provider, these parameters are typically configured in a
/// `Rocket.toml` file:
/// ///
/// ```toml /// ```toml
/// [global.databases.my_database] /// [default.databases.db_name]
/// url = "postgres://root:root@localhost/my_database" /// url = "/path/to/db.sqlite"
/// pool_size = 10 ///
/// # only `url` is required. `Initializer` provides defaults for the rest.
/// min_connections = 64
/// max_connections = 1024
/// connect_timeout = 5
/// idle_timeout = 120
/// ``` /// ```
/// ///
/// ...the following struct would be passed to [`Pool::initialize()`]: /// Alternatively, a custom provider can be used. For example, a custom `Figment`
/// with a global `databases.name` configuration:
/// ///
/// ```rust /// ```rust
/// # use rocket_db_pools::Config; /// # use rocket::launch;
/// Config { /// #[launch]
/// url: "postgres://root:root@localhost/my_database".into(), /// fn rocket() -> _ {
/// pool_size: 10, /// let figment = rocket::Config::figment()
/// timeout: 5, /// .merge(("databases.name", rocket_db_pools::Config {
/// }; /// url: "db:specific@config&url".into(),
/// min_connections: None,
/// max_connections: 1024,
/// connect_timeout: 3,
/// idle_timeout: None,
/// }));
///
/// rocket::custom(figment)
/// }
/// ``` /// ```
/// ///
/// If you want to implement your own custom database adapter and need some more /// For general information on configuration in Rocket, see [`rocket::config`].
/// configuration options, you may need to define a custom `Config` struct. /// For higher-level details on configuring a database, see the [crate-level
/// /// docs](crate#configuration).
/// [`Pool::initialize()`]: crate::Pool::initialize
#[derive(Serialize, Deserialize, Debug, Clone, PartialEq)] #[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
#[serde(crate = "rocket::serde")] #[serde(crate = "rocket::serde")]
pub struct Config { pub struct Config {
/// Connection URL specified in the Rocket configuration. /// Database-specific connection and configuration URL.
///
/// The format of the URL is database specific; consult your database's
/// documentation.
pub url: String, pub url: String,
/// Initial pool size. Defaults to the number of Rocket workers * 4. /// Minimum number of connections to maintain in the pool.
pub pool_size: u32, ///
/// How long to wait, in seconds, for a new connection before timing out. /// **Note:** `deadpool` drivers do not support and thus ignore this value.
/// Defaults to `5`. ///
// FIXME: Use `time`. /// _Default:_ `None`.
pub timeout: u8, pub min_connections: Option<u32>,
} /// Maximum number of connections to maintain in the pool.
///
impl Config { /// _Default:_ `workers * 4`.
pub fn from(db_name: &str, rocket: &Rocket<Build>) -> Result<Self, figment::Error> { pub max_connections: usize,
Self::figment(db_name, rocket).extract::<Self>() /// Number of seconds to wait for a connection before timing out.
} ///
/// If the timeout elapses before a connection can be made or retrieved from
pub fn figment(db_name: &str, rocket: &Rocket<Build>) -> Figment { /// a pool, an error is returned.
let db_key = format!("databases.{}", db_name); ///
let default_pool_size = rocket.figment() /// _Default:_ `5`.
.extract_inner::<u32>(rocket::Config::WORKERS) pub connect_timeout: u64,
.map(|workers| workers * 4) /// Maximum number of seconds to keep a connection alive for.
.ok(); ///
/// After a connection is established, it is maintained in a pool for
let figment = Figment::from(rocket.figment()) /// efficient connection retrieval. When an `idle_timeout` is set, that
.focus(&db_key) /// connection will be closed after the timeout elapses. If an
.join(Serialized::default("timeout", 5)); /// `idle_timeout` is not specified, the behavior is driver specific but
/// typically defaults to keeping a connection active indefinitely.
match default_pool_size { ///
Some(pool_size) => figment.join(Serialized::default("pool_size", pool_size)), /// _Default:_ `None`.
None => figment pub idle_timeout: Option<u64>,
}
}
} }

320
contrib/db_pools/lib/src/database.rs
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@ -1,119 +1,279 @@
use rocket::fairing::{Info, Kind}; use std::marker::PhantomData;
use rocket::futures::future::BoxFuture; use std::ops::{Deref, DerefMut};
use rocket::http::Status;
use rocket::{error, info_, Build, Ignite, Phase, Rocket, Sentinel};
use rocket::fairing::{self, Fairing, Info, Kind};
use rocket::request::{FromRequest, Outcome, Request}; use rocket::request::{FromRequest, Outcome, Request};
use rocket::http::Status;
use rocket::yansi::Paint; use rocket::yansi::Paint;
use rocket::{Build, Ignite, Rocket, Sentinel}; use rocket::figment::providers::Serialized;
use crate::{Error, Pool}; use crate::Pool;
/// Trait implemented to define a database connection pool. /// Derivable trait which ties a database [`Pool`] with a configuration name.
pub trait Database: Sized + Send + Sync + 'static { ///
/// The name of this connection pool in the configuration. /// This trait should rarely, if ever, be implemented manually. Instead, it
const NAME: &'static str; /// should be derived:
///
/// The underlying connection type returned by this pool. /// ```rust
/// Must implement [`Pool`]. /// # #[cfg(feature = "deadpool_redis")] mod _inner {
/// # use rocket::launch;
/// use rocket_db_pools::{deadpool_redis, Database};
///
/// #[derive(Database)]
/// #[database("memdb")]
/// struct Db(deadpool_redis::Pool);
///
/// #[launch]
/// fn rocket() -> _ {
/// rocket::build().attach(Db::init())
/// }
/// # }
/// ```
///
/// See the [`Database` derive](derive@crate::Database) for details.
pub trait Database: From<Self::Pool> + DerefMut<Target = Self::Pool> + Send + Sync + 'static {
/// The [`Pool`] type of connections to this database.
///
/// When `Database` is derived, this takes the value of the `Inner` type in
/// `struct Db(Inner)`.
type Pool: Pool; type Pool: Pool;
/// Returns a fairing that attaches this connection pool to the server. /// The configuration name for this database.
fn fairing() -> Fairing<Self>; ///
/// When `Database` is derived, this takes the value `"name"` in the
/// `#[database("name")]` attribute.
const NAME: &'static str;
/// Direct shared access to the underlying database pool /// Returns a fairing that initializes the database and its connection pool.
fn pool(&self) -> &Self::Pool; ///
/// # Example
///
/// ```rust
/// # #[cfg(feature = "deadpool_postgres")] mod _inner {
/// # use rocket::launch;
/// use rocket_db_pools::{deadpool_postgres, Database};
///
/// #[derive(Database)]
/// #[database("pg_db")]
/// struct Db(deadpool_postgres::Pool);
///
/// #[launch]
/// fn rocket() -> _ {
/// rocket::build().attach(Db::init())
/// }
/// # }
/// ```
fn init() -> Initializer<Self> {
Initializer::new()
}
/// get().await returns a connection from the pool (or an error) /// Returns a reference to the initialized database in `rocket`. The
fn get(&self) -> BoxFuture<'_, Result<Connection<Self>, <Self::Pool as Pool>::GetError>> { /// initializer fairing returned by `init()` must have already executed for
Box::pin(async move { self.pool().get().await.map(Connection)} ) /// `Option` to be `Some`. This is guaranteed to be the case if the fairing
/// is attached and either:
///
/// * Rocket is in the [`Orbit`](rocket::Orbit) phase. That is, the
/// application is running. This is always the case in request guards
/// and liftoff fairings,
/// * _or_ Rocket is in the [`Build`](rocket::Build) or
/// [`Ignite`](rocket::Ignite) phase and the `Initializer` fairing has
/// already been run. This is the case in all fairing callbacks
/// corresponding to fairings attached _after_ the `Initializer`
/// fairing.
///
/// # Example
///
/// Run database migrations in an ignite fairing. It is imperative that the
/// migration fairing be registered _after_ the `init()` fairing.
///
/// ```rust
/// # #[cfg(feature = "sqlx_sqlite")] mod _inner {
/// # use rocket::launch;
/// use rocket::{Rocket, Build};
/// use rocket::fairing::{self, AdHoc};
///
/// use rocket_db_pools::{sqlx, Database};
///
/// #[derive(Database)]
/// #[database("sqlite_db")]
/// struct Db(sqlx::SqlitePool);
///
/// async fn run_migrations(rocket: Rocket<Build>) -> fairing::Result {
/// if let Some(db) = Db::fetch(&rocket) {
/// // run migrations using `db`. get the inner type with &db.0.
/// Ok(rocket)
/// } else {
/// Err(rocket)
/// }
/// }
///
/// #[launch]
/// fn rocket() -> _ {
/// rocket::build()
/// .attach(Db::init())
/// .attach(AdHoc::try_on_ignite("DB Migrations", run_migrations))
/// }
/// # }
/// ```
fn fetch<P: Phase>(rocket: &Rocket<P>) -> Option<&Self> {
if let Some(db) = rocket.state() {
return Some(db);
}
let dbtype = std::any::type_name::<Self>();
let fairing = Paint::default(format!("{}::init()", dbtype)).bold();
error!("Attempted to fetch unattached database `{}`.", Paint::default(dbtype).bold());
info_!("`{}` fairing must be attached prior to using this database.", fairing);
None
} }
} }
/// A connection. The underlying connection type is determined by `D`, which /// A [`Fairing`] which initializes a [`Database`] and its connection pool.
/// must implement [`Database`]. ///
/// A value of this type can be created for any type `D` that implements
/// [`Database`] via the [`Database::init()`] method on the type. Normally, a
/// value of this type _never_ needs to be constructed directly. This
/// documentation exists purely as a reference.
///
/// This fairing initializes a database pool. Specifically, it:
///
/// 1. Reads the configuration at `database.db_name`, where `db_name` is
/// [`Database::NAME`].
///
/// 2. Sets [`Config`](crate::Config) defaults on the configuration figment.
///
/// 3. Calls [`Pool::init()`].
///
/// 4. Stores the database instance in managed storage, retrievable via
/// [`Database::fetch()`].
///
/// The name of the fairing itself is `Initializer<D>`, with `D` replaced with
/// the type name `D` unless a name is explicitly provided via
/// [`Self::with_name()`].
pub struct Initializer<D: Database>(Option<&'static str>, PhantomData<fn() -> D>);
/// A request guard which retrieves a single connection to a [`Database`].
///
/// For a database type of `Db`, a request guard of `Connection<Db>` retrieves a
/// single connection to `Db`.
///
/// The request guard succeeds if the database was initialized by the
/// [`Initializer`] fairing and a connection is available within
/// [`connect_timeout`](crate::Config::connect_timeout) seconds.
/// * If the `Initializer` fairing was _not_ attached, the guard _fails_ with
/// status `InternalServerError`. A [`Sentinel`] guards this condition, and so
/// this type of failure is unlikely to occur. A `None` error is returned.
/// * If a connection is not available within `connect_timeout` seconds or
/// another error occurs, the gaurd _fails_ with status `ServiceUnavailable`
/// and the error is returned in `Some`.
///
/// ## Deref
///
/// A type of `Connection<Db>` dereferences, mutably and immutably, to the
/// native database connection type. The [driver table](crate#supported-drivers)
/// lists the concrete native `Deref` types.
///
/// # Example
///
/// ```rust
/// # #[cfg(feature = "sqlx_sqlite")] mod _inner {
/// # use rocket::get;
/// # type Pool = rocket_db_pools::sqlx::SqlitePool;
/// use rocket_db_pools::{Database, Connection};
///
/// #[derive(Database)]
/// #[database("db")]
/// struct Db(Pool);
///
/// #[get("/")]
/// async fn db_op(db: Connection<Db>) {
/// // use `&*db` to get an immutable borrow to the native connection type
/// // use `&mut *db` to get a mutable borrow to the native connection type
/// }
/// # }
/// ```
pub struct Connection<D: Database>(<D::Pool as Pool>::Connection); pub struct Connection<D: Database>(<D::Pool as Pool>::Connection);
impl<D: Database> std::ops::Deref for Connection<D> { impl<D: Database> Initializer<D> {
type Target = <D::Pool as Pool>::Connection; /// Returns a database initializer fairing for `D`.
fn deref(&self) -> &Self::Target { ///
&self.0 /// This method should never need to be called manually. See the [crate
/// docs](crate) for usage information.
pub fn new() -> Self {
Self(None, std::marker::PhantomData)
}
/// Returns a database initializer fairing for `D` with name `name`.
///
/// This method should never need to be called manually. See the [crate
/// docs](crate) for usage information.
pub fn with_name(name: &'static str) -> Self {
Self(Some(name), std::marker::PhantomData)
} }
} }
impl<D: Database> std::ops::DerefMut for Connection<D> { #[rocket::async_trait]
fn deref_mut(&mut self) -> &mut Self::Target { impl<D: Database> Fairing for Initializer<D> {
&mut self.0 fn info(&self) -> Info {
Info {
name: self.0.unwrap_or(std::any::type_name::<Self>()),
kind: Kind::Ignite,
}
}
async fn on_ignite(&self, rocket: Rocket<Build>) -> fairing::Result {
let workers: usize = rocket.figment()
.extract_inner(rocket::Config::WORKERS)
.unwrap_or_else(|_| rocket::Config::default().workers);
let figment = rocket.figment()
.focus(&format!("databases.{}", D::NAME))
.merge(Serialized::default("max_connections", workers * 4))
.merge(Serialized::default("connect_timeout", 5));
match <D::Pool>::init(&figment).await {
Ok(pool) => Ok(rocket.manage(D::from(pool))),
Err(e) => {
error!("failed to initialize database: {}", e);
Err(rocket)
}
}
} }
} }
#[rocket::async_trait] #[rocket::async_trait]
impl<'r, D: Database> FromRequest<'r> for Connection<D> { impl<'r, D: Database> FromRequest<'r> for Connection<D> {
type Error = Error<<D::Pool as Pool>::GetError>; type Error = Option<<D::Pool as Pool>::Error>;
async fn from_request(req: &'r Request<'_>) -> Outcome<Self, Self::Error> { async fn from_request(req: &'r Request<'_>) -> Outcome<Self, Self::Error> {
let db: &D = match req.rocket().state() { match D::fetch(req.rocket()) {
Some(p) => p, Some(db) => match db.get().await {
_ => {
let dbtype = Paint::default(std::any::type_name::<D>()).bold();
let fairing = Paint::default(format!("{}::fairing()", dbtype)).wrap().bold();
error!("requesting `{}` DB connection without attaching `{}`.", dbtype, fairing);
info_!("Attach `{}` to use database connection pooling.", fairing);
return Outcome::Failure((Status::InternalServerError, Error::UnattachedFairing));
}
};
match db.pool().get().await {
Ok(conn) => Outcome::Success(Connection(conn)), Ok(conn) => Outcome::Success(Connection(conn)),
Err(e) => Outcome::Failure((Status::ServiceUnavailable, Error::Db(e))), Err(e) => Outcome::Failure((Status::ServiceUnavailable, Some(e))),
},
None => Outcome::Failure((Status::InternalServerError, None)),
} }
} }
} }
impl<D: Database> Sentinel for Connection<D> { impl<D: Database> Sentinel for Connection<D> {
fn abort(rocket: &Rocket<Ignite>) -> bool { fn abort(rocket: &Rocket<Ignite>) -> bool {
if rocket.state::<D>().is_none() { D::fetch(rocket).is_none()
let dbtype = Paint::default(std::any::type_name::<D>()).bold();
let fairing = Paint::default(format!("{}::fairing()", dbtype)).wrap().bold();
error!("requesting `{}` DB connection without attaching `{}`.", dbtype, fairing);
info_!("Attach `{}` to use database connection pooling.", fairing);
return true;
}
false
} }
} }
/// The database fairing for pool types created with the `pool!` macro. impl<D: Database> Deref for Connection<D> {
pub struct Fairing<D: Database>(&'static str, std::marker::PhantomData<fn(D::Pool)>); type Target = <D::Pool as Pool>::Connection;
impl<D: Database + From<D::Pool>> Fairing<D> { fn deref(&self) -> &Self::Target {
/// Create a new database fairing with the given constructor. This &self.0
/// constructor will be called to create an instance of `D` after the pool
/// is initialized and before it is placed into managed state.
pub fn new(fairing_name: &'static str) -> Self {
Self(fairing_name, std::marker::PhantomData)
} }
} }
#[rocket::async_trait] impl<D: Database> DerefMut for Connection<D> {
impl<D: Database + From<D::Pool>> rocket::fairing::Fairing for Fairing<D> { fn deref_mut(&mut self) -> &mut Self::Target {
fn info(&self) -> Info { &mut self.0
Info {
name: self.0,
kind: Kind::Ignite,
}
}
async fn on_ignite(&self, rocket: Rocket<Build>) -> Result<Rocket<Build>, Rocket<Build>> {
let pool = match <D::Pool>::initialize(D::NAME, &rocket).await {
Ok(p) => p,
Err(e) => {
error!("error initializing database connection pool: {}", e);
return Err(rocket);
}
};
let db: D = pool.into();
Ok(rocket.manage(db))
} }
} }

44
contrib/db_pools/lib/src/error.rs
View File

@ -1,41 +1,35 @@
use std::fmt; use std::fmt;
use rocket::figment; /// A general error type for use by [`Pool`](crate::Pool#implementing)
/// implementors and returned by the [`Connection`](crate::Connection) request
/// A general error type designed for the `Poolable` trait. /// guard.
///
/// [`Pool::initialize`] can return an error for any of several reasons:
///
/// * Missing or incorrect configuration, including some syntax errors
/// * An error connecting to the database.
///
/// [`Pool::initialize`]: crate::Pool::initialize
#[derive(Debug)] #[derive(Debug)]
pub enum Error<E> { pub enum Error<A, B = A> {
/// A database-specific error occurred /// An error that occured during database/pool initialization.
Db(E), Init(A),
/// An error occurred in the configuration /// An error that ocurred while retrieving a connection from the pool.
Figment(figment::Error), Get(B),
/// Required fairing was not attached /// A [`Figment`](crate::figment::Figment) configuration error.
UnattachedFairing, Config(crate::figment::Error),
} }
impl<E: fmt::Display> fmt::Display for Error<E> { impl<A: fmt::Display, B: fmt::Display> fmt::Display for Error<A, B> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self { match self {
Error::Db(e) => e.fmt(f), Error::Init(e) => write!(f, "failed to initialize database: {}", e),
Error::Figment(e) => write!(f, "bad configuration: {}", e), Error::Get(e) => write!(f, "failed to get db connection: {}", e),
Error::UnattachedFairing => write!(f, "required database fairing was not attached"), Error::Config(e) => write!(f, "bad configuration: {}", e),
} }
} }
} }
impl<E: fmt::Debug + fmt::Display> std::error::Error for Error<E> {} impl<A, B> std::error::Error for Error<A, B>
where A: fmt::Debug + fmt::Display, B: fmt::Debug + fmt::Display {}
impl<E> From<figment::Error> for Error<E> { impl<A, B> From<crate::figment::Error> for Error<A, B> {
fn from(e: figment::Error) -> Self { fn from(e: crate::figment::Error) -> Self {
Self::Figment(e) Self::Config(e)
} }
} }

462
contrib/db_pools/lib/src/lib.rs
View File

@ -1,382 +1,238 @@
//! Traits, utilities, and a macro for easy database connection pooling. //! Asynchronous database driver connection pooling integration for Rocket.
//! //!
//! # Overview //! # Quickstart
//! //!
//! This crate provides traits, utilities, and a procedural macro for //! 1. Add `rocket_db_pools` as a dependency with one or more [database driver
//! configuring and accessing database connection pools in Rocket. A _database //! features](#supported-drivers) enabled:
//! connection pool_ is a data structure that maintains active database
//! connections for later use in the application.
//!
//! Databases are individually configured through Rocket's regular configuration
//! mechanisms. Connecting a Rocket application to a database using this library
//! occurs in three simple steps:
//!
//! 1. Configure your databases in `Rocket.toml`.
//! (see [Configuration](#configuration))
//! 2. Associate a Database type and fairing with each database.
//! (see [Guard Types](#guard-types))
//! 3. Use the request guard to retrieve a connection in a handler.
//! (see [Handlers](#handlers))
//!
//! For a list of supported databases, see [Provided Databases](#provided). This
//! support can be easily extended by implementing the [`Pool`] trait. See
//! [Extending](#extending) for more.
//!
//! ## Example
//!
//! Before using this library, the feature corresponding to your database type
//! in `rocket_db_pools` must be enabled:
//! //!
//! ```toml //! ```toml
//! [dependencies.rocket_db_pools] //! [dependencies.rocket_db_pools]
//! version = "0.1.0-dev" //! version = "0.1.0-rc"
//! features = ["sqlx_sqlite"] //! features = ["sqlx_sqlite"]
//! ``` //! ```
//! //!
//! See [Provided](#provided) for a list of supported database and their //! 2. Choose a name for your database, here `sqlite_logs`.
//! associated feature name. //! [Configure](#configuration) _at least_ a URL for the database:
//!
//! In whichever configuration source you choose, configure a `databases`
//! dictionary with an internal dictionary for each database, here `sqlite_logs`
//! in a TOML source:
//! //!
//! ```toml //! ```toml
//! [default.databases] //! [default.databases.sqlite_logs]
//! sqlite_logs = { url = "/path/to/database.sqlite" } //! url = "/path/to/database.sqlite"
//! ``` //! ```
//! //!
//! In your application's source code, one-time: //! 3. [Derive](derive@Database) [`Database`] for a unit type (`Logs` here)
//! which wraps the selected driver's [`Pool`] type (see [the driver
//! table](#supported-drivers)) and is decorated with `#[database("name")]`.
//! Attach `Type::init()` to your application's `Rocket` to initialize the
//! database pool:
//! //!
//! ```rust //! ```rust
//! # #[macro_use] extern crate rocket; //! # #[cfg(feature = "sqlx_sqlite")] mod _inner {
//! # #[cfg(feature = "sqlx_sqlite")] //! # use rocket::launch;
//! # mod test { //! use rocket_db_pools::{sqlx, Database};
//! use rocket_db_pools::{Database, Connection, sqlx};
//! //!
//! #[derive(Database)] //! #[derive(Database)]
//! #[database("sqlite_logs")] //! #[database("sqlite_logs")]
//! struct LogsDb(sqlx::SqlitePool); //! struct Logs(sqlx::SqlitePool);
//!
//! type LogsDbConn = Connection<LogsDb>;
//! //!
//! #[launch] //! #[launch]
//! fn rocket() -> _ { //! fn rocket() -> _ {
//! rocket::build().attach(LogsDb::fairing()) //! rocket::build().attach(Logs::init())
//! } //! }
//! # } fn main() {} //! # }
//! ``` //! ```
//! //!
//! These steps can be repeated as many times as necessary to configure //! 4. Use [`Connection<Type>`](Connection) as a request guard to retrieve an
//! multiple databases. //! active database connection, which dereferences to the native type in the
//! //! [`Connection` deref](#supported-drivers) column.
//! Whenever a connection to the database is needed:
//! //!
//! ```rust //! ```rust
//! # #[macro_use] extern crate rocket; //! # #[cfg(feature = "sqlx_sqlite")] mod _inner {
//! # #[macro_use] extern crate rocket_db_pools; //! # use rocket::{get, response::Responder};
//! # //! # use rocket_db_pools::{sqlx, Database};
//! # #[cfg(feature = "sqlx_sqlite")]
//! # mod test {
//! # use rocket::serde::json::Json;
//! # use rocket_db_pools::{Database, Connection, sqlx};
//! #
//! # #[derive(Database)] //! # #[derive(Database)]
//! # #[database("sqlite_logs")] //! # #[database("sqlite_logs")]
//! # struct LogsDb(sqlx::SqlitePool); //! # struct Logs(sqlx::SqlitePool);
//! # type LogsDbConn = Connection<LogsDb>;
//! # //! #
//! # type Result<T> = std::result::Result<T, ()>; //! # #[derive(Responder)]
//! # struct Log(String);
//! # //! #
//! #[get("/logs/<id>")] //! use rocket_db_pools::Connection;
//! async fn get_logs(conn: LogsDbConn, id: usize) -> Result<Json<Vec<String>>> { //! use rocket_db_pools::sqlx::Row;
//! # /* //!
//! let logs = sqlx::query!().await?; //! #[get("/<id>")]
//! Ok(Json(logs)) //! async fn read(mut db: Connection<Logs>, id: i64) -> Option<Log> {
//! # */ //! sqlx::query("SELECT content FROM logs WHERE id = ?").bind(id)
//! # Ok(Json(vec![])) //! .fetch_one(&mut *db).await
//! .and_then(|r| Ok(Log(r.try_get(0)?)))
//! .ok()
//! } //! }
//! # } fn main() {} //! # }
//! ``` //! ```
//! //!
//! # Usage //! Alternatively, use a reference to the database type as a request guard to
//! retrieve the entire pool, but note that unlike retrieving a `Connection`,
//! doing so does _not_ guarantee that a connection is available:
//! //!
//! ## Configuration //! ```rust
//! # #[cfg(feature = "sqlx_sqlite")] mod _inner {
//! # use rocket::{get, response::Responder};
//! # use rocket_db_pools::{sqlx, Database};
//! # #[derive(Database)]
//! # #[database("sqlite_logs")]
//! # struct Logs(sqlx::SqlitePool);
//! #
//! # #[derive(Responder)]
//! # struct Log(String);
//! #
//! use rocket_db_pools::sqlx::Row;
//! //!
//! Databases can be configured as any other values. Using the default //! #[get("/<id>")]
//! configuration provider, either via `Rocket.toml` or environment variables. //! async fn read(db: &Logs, id: i64) -> Option<Log> {
//! You can also use a custom provider. //! sqlx::query("SELECT content FROM logs WHERE id = ?").bind(id)
//! .fetch_one(&db.0).await
//! .and_then(|r| Ok(Log(r.try_get(0)?)))
//! .ok()
//! }
//! # }
//! ```
//! //!
//! ### `Rocket.toml` //! # Supported Drivers
//! //!
//! To configure a database via `Rocket.toml`, add a table for each database //! At present, this crate supports _three_ drivers: [`deadpool`], [`sqlx`],
//! to the `databases` table where the key is a name of your choice. The table //! and [`mongodb`]. Each driver may support multiple databases.
//! should have a `url` key and, optionally, a `pool_size` key. This looks as //!
//! follows: //! ## `deadpool` (v0.8)
//!
//! | Database | Feature | [`Pool`] Type | [`Connection`] Deref |
//! |----------|---------------------|-----------------------------|---------------------------------------|
//! | Postgres | `deadpool_postgres` | [`deadpool_postgres::Pool`] | [`deadpool_postgres::ClientWrapper`] |
//! | Redis | `deadpool_redis` | [`deadpool_redis::Pool`] | [`deadpool_redis::ConnectionWrapper`] |
//!
//! ## `sqlx` (v0.5)
//!
//! | Database | Feature | [`Pool`] Type | [`Connection`] Deref |
//! |----------|-----------------|----------------------|------------------------------------|
//! | Postgres | `sqlx_postgres` | [`sqlx::PgPool`] | [`sqlx::PoolConnection<Postgres>`] |
//! | MySQL | `sqlx_mysql` | [`sqlx::MySqlPool`] | [`sqlx::PoolConnection<MySql>`] |
//! | SQLite | `sqlx_sqlite` | [`sqlx::SqlitePool`] | [`sqlx::PoolConnection<Sqlite>`] |
//! | MSSQL | `sqlx_mssql` | [`sqlx::MssqlPool`] | [`sqlx::PoolConnection<Mssql>`] |
//!
//! [`sqlx::PgPool`]: https://docs.rs/sqlx/0.5/sqlx/type.PgPool.html
//! [`sqlx::MySqlPool`]: https://docs.rs/sqlx/0.5/sqlx/type.MySqlPool.html
//! [`sqlx::SqlitePool`]: https://docs.rs/sqlx/0.5/sqlx/type.SqlitePool.html
//! [`sqlx::MssqlPool`]: https://docs.rs/sqlx/0.5/sqlx/type.MssqlPool.html
//! [`sqlx::PoolConnection<Postgres>`]: https://docs.rs/sqlx/0.5/sqlx/pool/struct.PoolConnection.html
//! [`sqlx::PoolConnection<MySql>`]: https://docs.rs/sqlx/0.5/sqlx/pool/struct.PoolConnection.html
//! [`sqlx::PoolConnection<Sqlite>`]: https://docs.rs/sqlx/0.5/sqlx/pool/struct.PoolConnection.html
//! [`sqlx::PoolConnection<Mssql>`]: https://docs.rs/sqlx/0.5/sqlx/pool/struct.PoolConnection.html
//!
//! ## `mongodb` (v1)
//!
//! | Database | Feature | [`Pool`] Type and [`Connection`] Deref |
//! |----------|-----------|----------------------------------------|
//! | MongoDB | `mongodb` | [`mongodb::Client`] |
//!
//! ## Enabling Additional Driver Features
//!
//! Only the minimal features for each driver crate are enabled by
//! `rocket_db_pools`. To use additional driver functionality exposed via its
//! crate's features, you'll need to depend on the crate directly with those
//! features enabled in `Cargo.toml`:
//! //!
//! ```toml //! ```toml
//! # Option 1: //! [dependencies.sqlx]
//! [global.databases] //! version = "0.5"
//! sqlite_db = { url = "db.sqlite" } //! default-features = false
//! features = ["macros", "offline", "migrate"]
//! //!
//! # Option 2: //! [dependencies.rocket_db_pools]
//! [global.databases.my_db] //! version = "0.1.0-rc"
//! url = "postgres://root:root@localhost/my_db" //! features = ["sqlx_sqlite"]
//!
//! # With a `pool_size` key:
//! [global.databases]
//! sqlite_db = { url = "db.sqlite", pool_size = 20 }
//! ``` //! ```
//! //!
//! Most databases use the default [`Config`] type, for which one key is required: //! # Configuration
//! //!
//! * `url` - the URl to the database //! Configuration for a database named `db_name` is deserialized from a
//! `databases.db_name` configuration parameter into a [`Config`] structure via
//! Rocket's [configuration facilities](rocket::config). By default,
//! configuration can be provided in `Rocket.toml`:
//! //!
//! And one optional key is accepted: //! ```toml
//! [default.databases.db_name]
//! url = "db.sqlite"
//! //!
//! * `pool_size` - the size of the pool, i.e., the number of connections to //! # only `url` is required. the rest have defaults and are thus optional
//! pool (defaults to the configured number of workers * 4) //! min_connections = 64
//! TODO: currently ignored by most `Pool` implementations. //! max_connections = 1024
//! //! connect_timeout = 5
//! Different options may be required or supported by other adapters, according //! idle_timeout = 120
//! to the type specified by [`Pool::Config`].
//!
//! ### Procedurally
//!
//! Databases can also be configured procedurally via `rocket::custom()`.
//! The example below does just this:
//!
//! ```rust
//! # #[cfg(feature = "sqlx_sqlite")] {
//! # use rocket::launch;
//! use rocket::figment::{value::{Map, Value}, util::map};
//!
//! #[launch]
//! fn rocket() -> _ {
//! let db: Map<_, Value> = map! {
//! "url" => "db.sqlite".into(),
//! "pool_size" => 10.into()
//! };
//!
//! let figment = rocket::Config::figment()
//! .merge(("databases", map!["my_db" => db]));
//!
//! rocket::custom(figment)
//! }
//! # rocket();
//! # }
//! ``` //! ```
//! //!
//! ### Environment Variables //! Or via environment variables:
//! //!
//! Lastly, databases can be configured via environment variables by specifying //! ```sh
//! the `databases` table as detailed in the [Environment Variables //! ROCKET_DATABASES='{db_name={url="db.sqlite",idle_timeout=120}}'
//! configuration
//! guide](https://rocket.rs/master/guide/configuration/#environment-variables):
//!
//! ```bash
//! ROCKET_DATABASES='{my_db={url="db.sqlite"}}'
//! ``` //! ```
//! //!
//! Multiple databases can be specified in the `ROCKET_DATABASES` environment variable //! See [`Config`] for details on configuration parameters.
//! as well by comma separating them:
//! //!
//! ```bash //! **Note:** `deadpool` drivers do not support and thus ignore the
//! ROCKET_DATABASES='{my_db={url="db.sqlite"},my_pg_db={url="postgres://root:root@localhost/my_pg_db"}}' //! `min_connections` value.
//! ```
//! //!
//! ## Database Types //! ## Driver Defaults
//! //!
//! Once a database has been configured, the `#[derive(Database)]` macro can be //! Some drivers provide configuration defaults different from the underyling
//! used to tie a type in your application to a configured database. The derive //! database's defaults. A best-effort attempt is made to document those
//! accepts a single attribute, `#[database("name")]` that indicates the //! differences below:
//! name of the database. This corresponds to the database name set as the
//! database's configuration key.
//! //!
//! The [`Database`] trait provides a method, `fairing()`, which places an //! * `sqlx_sqlite`
//! instance of the decorated type in managed state; thus, the database pool can
//! be accessed with a `&State<DbType>` request guard.
//! //!
//! The [`Connection`] type also implements [`FromRequest`], allowing it to be //! - foreign keys : `enabled`
//! used as a request guard. This implementation retrieves a connection from the //! - journal mode : `WAL`
//! database pool or fails with a `Status::ServiceUnavailable` if connecting to //! - create-missing : `enabled`
//! the database fails or times out. //! - synchronous : `full` (even when `WAL`)
//! - busy timeout : `connection_timeout`
//! //!
//! The derive can only be applied to unit-like structs with one type. The //! * `sqlx_postgres`
//! internal type of the structure must implement [`Pool`].
//! //!
//! ```rust //! - sslmode : `prefer`
//! # #[macro_use] extern crate rocket_db_pools; //! - statement-cache-capacity : `100`
//! # #[cfg(feature = "sqlx_sqlite")] //! - user : result of `whoami`
//! # mod test {
//! use rocket_db_pools::{Database, sqlx};
//! //!
//! #[derive(Database)] //! * `sqlx_mysql`
//! #[database("my_db")]
//! struct MyDatabase(sqlx::SqlitePool);
//! # }
//! ```
//! //!
//! Other databases can be used by specifying their respective [`Pool`] type: //! - sslmode : `PREFERRED`
//! - statement-cache-capacity : `100`
//! //!
//! ```rust //! # Extending
//! # #[macro_use] extern crate rocket_db_pools;
//! # #[cfg(feature = "deadpool_postgres")]
//! # mod test {
//! use rocket_db_pools::{Database, deadpool_postgres};
//! //!
//! #[derive(Database)] //! Any database driver can implement support for this libary by implementing
//! #[database("my_pg_db")] //! the [`Pool`] trait.
//! struct MyPgDatabase(deadpool_postgres::Pool);
//! # }
//! ```
//!
//! The fairing returned from the `fairing()` method _must_ be attached for the
//! request guards to succeed. Putting the pieces together, a use of
//! `#[derive(Database)]` looks as follows:
//!
//! ```rust
//! # #[macro_use] extern crate rocket;
//! # #[macro_use] extern crate rocket_db_pools;
//! #
//! # #[cfg(feature = "sqlx_sqlite")] {
//! # use rocket::figment::{value::{Map, Value}, util::map};
//! use rocket_db_pools::{Database, sqlx};
//!
//! #[derive(Database)]
//! #[database("my_db")]
//! struct MyDatabase(sqlx::SqlitePool);
//!
//! #[launch]
//! fn rocket() -> _ {
//! # let db: Map<_, Value> = map![
//! # "url" => "db.sqlite".into(), "pool_size" => 10.into()
//! # ];
//! # let figment = rocket::Config::figment().merge(("databases", map!["my_db" => db]));
//! rocket::custom(figment).attach(MyDatabase::fairing())
//! }
//! # }
//! ```
//!
//! ## Handlers
//!
//! Finally, access your type via `State` in a handler to access
//! the database connection pool:
//!
//! ```rust
//! # #[macro_use] extern crate rocket;
//! # #[macro_use] extern crate rocket_db_pools;
//! #
//! # #[cfg(feature = "sqlx_sqlite")]
//! # mod test {
//! # use rocket_db_pools::{Database, Connection, sqlx};
//! use rocket::State;
//!
//! #[derive(Database)]
//! #[database("my_db")]
//! struct MyDatabase(sqlx::SqlitePool);
//!
//! #[get("/")]
//! fn my_handler(conn: &State<MyDatabase>) {
//! // ...
//! }
//! # }
//! ```
//!
//! Alternatively, access a single connection directly via the `Connection`
//! request guard:
//!
//! ```rust
//! # #[macro_use] extern crate rocket;
//! # #[macro_use] extern crate rocket_db_pools;
//! #
//! # #[cfg(feature = "sqlx_sqlite")]
//! # mod test {
//! # use rocket_db_pools::{Database, Connection, sqlx};
//! # type Data = ();
//! #[derive(Database)]
//! #[database("my_db")]
//! struct MyDatabase(sqlx::SqlitePool);
//!
//! type MyConnection = Connection<MyDatabase>;
//!
//! async fn load_from_db(conn: &mut sqlx::SqliteConnection) -> Data {
//! // Do something with connection, return some data.
//! # ()
//! }
//!
//! #[get("/")]
//! async fn my_handler(mut conn: MyConnection) -> Data {
//! load_from_db(&mut conn).await
//! }
//! # }
//! ```
//!
//! # Database Support
//!
//! Built-in support is provided for many popular databases and drivers. Support
//! can be easily extended by [`Pool`] implementations.
//!
//! ## Provided
//!
//! The list below includes all presently supported database adapters and their
//! corresponding [`Pool`] type.
//!
// Note: Keep this table in sync with site/guite/6-state.md
//! | Kind | Driver | Version | `Pool` Type | Feature |
//! |----------|-----------------------|-----------|--------------------------------|------------------------|
//! | MySQL | [sqlx] | `0.5` | [`sqlx::MySqlPool`] | `sqlx_mysql` |
//! | Postgres | [sqlx] | `0.5` | [`sqlx::PgPool`] | `sqlx_postgres` |
//! | Sqlite | [sqlx] | `0.5` | [`sqlx::SqlitePool`] | `sqlx_sqlite` |
//! | Mongodb | [mongodb] | `2.0.0-beta` | [`mongodb::Client`] | `mongodb` |
//! | MySQL | [mysql_async] | `0.27` | [`mysql_async::Pool`] | `mysql_async` |
//! | Postgres | [deadpool-postgres] | `0.8` | [`deadpool_postgres::Pool`] | `deadpool_postgres` |
//! | Redis | [deadpool-redis] | `0.8` | [`deadpool_redis::Pool`] | `deadpool_redis` |
//!
//! [sqlx]: https://docs.rs/sqlx/0.5/sqlx/
//! [deadpool-postgres]: https://docs.rs/deadpool-postgres/0.8/deadpool_postgres/
//! [deadpool-redis]: https://docs.rs/deadpool-redis/0.8/deadpool_redis/
//! [mongodb]: https://docs.rs/mongodb/2.0.0-beta/mongodb/index.html
//! [mysql_async]: https://docs.rs/mysql_async/0.27/mysql_async/
//!
//! The above table lists all the supported database adapters in this library.
//! In order to use particular `Pool` type that's included in this library,
//! you must first enable the feature listed in the "Feature" column. The
//! interior type of your decorated database type should match the type in the
//! "`Pool` Type" column.
//!
//! ## Extending
//!
//! Extending Rocket's support to your own custom database adapter is as easy as
//! implementing the [`Pool`] trait. See the documentation for [`Pool`]
//! for more details on how to implement it.
//!
//! [`FromRequest`]: rocket::request::FromRequest
//! [request guards]: rocket::request::FromRequest
//! [`Database`]: crate::Database
//! [`Pool`]: crate::Pool
#![doc(html_root_url = "https://api.rocket.rs/master/rocket_db_pools")] #![doc(html_root_url = "https://api.rocket.rs/master/rocket_db_pools")]
#![doc(html_favicon_url = "https://rocket.rs/images/favicon.ico")] #![doc(html_favicon_url = "https://rocket.rs/images/favicon.ico")]
#![doc(html_logo_url = "https://rocket.rs/images/logo-boxed.png")] #![doc(html_logo_url = "https://rocket.rs/images/logo-boxed.png")]
#[doc(hidden)] #![deny(missing_docs)]
#[macro_use]
pub extern crate rocket;
/// Re-export of the `figment` crate.
#[doc(inline)]
pub use rocket::figment;
pub use rocket;
#[cfg(feature = "deadpool_postgres")] pub use deadpool_postgres; #[cfg(feature = "deadpool_postgres")] pub use deadpool_postgres;
#[cfg(feature = "deadpool_redis")] pub use deadpool_redis; #[cfg(feature = "deadpool_redis")] pub use deadpool_redis;
#[cfg(feature = "mysql_async")] pub use mysql_async;
#[cfg(feature = "mongodb")] pub use mongodb; #[cfg(feature = "mongodb")] pub use mongodb;
#[cfg(feature = "sqlx")] pub use sqlx; #[cfg(feature = "sqlx")] pub use sqlx;
mod config;
mod database; mod database;
mod error; mod error;
mod pool; mod pool;
mod config;
pub use self::config::Config; pub use self::database::{Connection, Database, Initializer};
pub use self::database::{Connection, Database, Fairing};
pub use self::error::Error; pub use self::error::Error;
pub use self::pool::Pool; pub use self::pool::Pool;
pub use self::config::Config;
pub use rocket_db_pools_codegen::*; pub use rocket_db_pools_codegen::*;

419
contrib/db_pools/lib/src/pool.rs
View File

@ -1,61 +1,115 @@
use rocket::async_trait; use rocket::figment::Figment;
use rocket::{Build, Rocket};
use crate::{Config, Error}; #[allow(unused_imports)]
use {std::time::Duration, crate::{Error, Config}};
/// This trait is implemented on connection pool types that can be used with the /// Generic [`Database`](crate::Database) driver connection pool trait.
/// [`Database`] derive macro.
/// ///
/// `Pool` determines how the connection pool is initialized from configuration, /// This trait provides a generic interface to various database pooling
/// such as a connection string and optional pool size, along with the returned /// implementations in the Rust ecosystem. It can be implemented by anyone, but
/// `Connection` type. /// this crate provides implementations for common drivers.
/// ///
/// Implementations of this trait should use `async_trait`. /// **Implementations of this trait outside of this crate should be rare. You
/// _do not_ need to implement this trait or understand its specifics to use
/// this crate.**
/// ///
/// ## Example /// ## Async Trait
/// ///
/// [`Pool`] is an _async_ trait. Implementations of `Pool` must be decorated
/// with an attribute of `#[async_trait]`:
///
/// ```rust
/// # #[macro_use] extern crate rocket;
/// use rocket::figment::Figment;
/// use rocket_db_pools::Pool;
///
/// # struct MyPool;
/// # type Connection = ();
/// # type Error = std::convert::Infallible;
/// #[rocket::async_trait]
/// impl Pool for MyPool {
/// type Connection = Connection;
///
/// type Error = Error;
///
/// async fn init(figment: &Figment) -> Result<Self, Self::Error> {
/// todo!("initialize and return an instance of the pool");
/// }
///
/// async fn get(&self) -> Result<Self::Connection, Self::Error> {
/// todo!("fetch one connection from the pool");
/// }
/// }
/// ``` /// ```
/// use rocket::{Build, Rocket};
/// ///
/// #[derive(Debug)] /// ## Implementing
/// struct Error { /* ... */ } ///
/// # impl std::fmt::Display for Error { /// Implementations of `Pool` typically trace the following outline:
/// # fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { ///
/// # unimplemented!("example") /// 1. The `Error` associated type is set to [`Error`].
///
/// 2. A [`Config`] is [extracted](Figment::extract()) from the `figment`
/// passed to init.
///
/// 3. The pool is initialized and returned in `init()`, wrapping
/// initialization errors in [`Error::Init`].
///
/// 4. A connection is retrieved in `get()`, wrapping errors in
/// [`Error::Get`].
///
/// Concretely, this looks like:
///
/// ```rust
/// use rocket::figment::Figment;
/// use rocket_db_pools::{Pool, Config, Error};
/// #
/// # type InitError = std::convert::Infallible;
/// # type GetError = std::convert::Infallible;
/// # type Connection = ();
/// #
/// # struct MyPool(Config);
/// # impl MyPool {
/// # fn new(c: Config) -> Result<Self, InitError> {
/// # Ok(Self(c))
/// # }
/// #
/// # fn acquire(&self) -> Result<Connection, GetError> {
/// # Ok(())
/// # } /// # }
/// # } /// # }
/// # impl std::error::Error for Error { }
///
/// struct Pool { /* ... */ }
/// struct Connection { /* .. */ }
/// ///
/// #[rocket::async_trait] /// #[rocket::async_trait]
/// impl rocket_db_pools::Pool for Pool { /// impl Pool for MyPool {
/// type Connection = Connection; /// type Connection = Connection;
/// type InitError = Error;
/// type GetError = Error;
/// ///
/// async fn initialize(db_name: &str, rocket: &Rocket<Build>) /// type Error = Error<InitError, GetError>;
/// -> Result<Self, rocket_db_pools::Error<Self::InitError>> ///
/// { /// async fn init(figment: &Figment) -> Result<Self, Self::Error> {
/// unimplemented!("example") /// // Extract the config from `figment`.
/// let config: Config = figment.extract()?;
///
/// // Read config values, initialize `MyPool`. Map errors of type
/// // `InitError` to `Error<InitError, _>` with `Error::Init`.
/// let pool = MyPool::new(config).map_err(Error::Init)?;
///
/// // Return the fully intialized pool.
/// Ok(pool)
/// } /// }
/// ///
/// async fn get(&self) -> Result<Connection, Self::GetError> { /// async fn get(&self) -> Result<Self::Connection, Self::Error> {
/// unimplemented!("example") /// // Get one connection from the pool, here via an `acquire()` method.
/// // Map errors of type `GetError` to `Error<_, GetError>`.
/// self.acquire().map_err(Error::Get)
/// } /// }
/// } /// }
/// ``` /// ```
#[async_trait] #[rocket::async_trait]
pub trait Pool: Sized + Send + Sync + 'static { pub trait Pool: Sized + Send + Sync + 'static {
/// The type returned by get(). /// The connection type managed by this pool, returned by [`Self::get()`].
type Connection; type Connection;
/// The error type returned by `initialize`. /// The error type returned by [`Self::init()`] and [`Self::get()`].
type InitError: std::error::Error; type Error: std::error::Error;
/// The error type returned by `get`.
type GetError: std::error::Error;
/// Constructs a pool from a [Value](rocket::figment::value::Value). /// Constructs a pool from a [Value](rocket::figment::value::Value).
/// ///
@ -69,219 +123,136 @@ pub trait Pool: Sized + Send + Sync + 'static {
/// This method returns an error if the configuration is not compatible, or /// This method returns an error if the configuration is not compatible, or
/// if creating a pool failed due to an unavailable database server, /// if creating a pool failed due to an unavailable database server,
/// insufficient resources, or another database-specific error. /// insufficient resources, or another database-specific error.
async fn initialize(db_name: &str, rocket: &Rocket<Build>) async fn init(figment: &Figment) -> Result<Self, Self::Error>;
-> Result<Self, Error<Self::InitError>>;
/// Asynchronously gets a connection from the factory or pool. /// Asynchronously retrieves a connection from the factory or pool.
/// ///
/// ## Errors /// ## Errors
/// ///
/// This method returns an error if a connection could not be retrieved, /// This method returns an error if a connection could not be retrieved,
/// such as a preconfigured timeout elapsing or when the database server is /// such as a preconfigured timeout elapsing or when the database server is
/// unavailable. /// unavailable.
async fn get(&self) -> Result<Self::Connection, Self::GetError>; async fn get(&self) -> Result<Self::Connection, Self::Error>;
}
#[cfg(feature = "deadpool")]
mod deadpool_postgres {
use deadpool::managed::{Manager, Pool, PoolConfig, PoolError, Object};
use super::{Duration, Error, Config, Figment};
pub trait DeadManager: Manager + Sized + Send + Sync + 'static {
fn new(config: &Config) -> Result<Self, Self::Error>;
} }
#[cfg(feature = "deadpool_postgres")] #[cfg(feature = "deadpool_postgres")]
#[async_trait] impl DeadManager for deadpool_postgres::Manager {
impl Pool for deadpool_postgres::Pool { fn new(config: &Config) -> Result<Self, Self::Error> {
type Connection = deadpool_postgres::Client; Ok(Self::new(config.url.parse()?, deadpool_postgres::tokio_postgres::NoTls))
type InitError = deadpool_postgres::tokio_postgres::Error;
type GetError = deadpool_postgres::PoolError;
async fn initialize(db_name: &str, rocket: &Rocket<Build>)
-> std::result::Result<Self, Error<Self::InitError>>
{
let config = Config::from(db_name, rocket)?;
let manager = deadpool_postgres::Manager::new(
config.url.parse().map_err(Error::Db)?,
// TODO: add TLS support in config
deadpool_postgres::tokio_postgres::NoTls,
);
let mut pool_config = deadpool_postgres::PoolConfig::new(config.pool_size as usize);
pool_config.timeouts.wait = Some(std::time::Duration::from_secs(config.timeout.into()));
Ok(deadpool_postgres::Pool::from_config(manager, pool_config))
}
async fn get(&self) -> Result<Self::Connection, Self::GetError> {
self.get().await
} }
} }
#[cfg(feature = "deadpool_redis")] #[cfg(feature = "deadpool_redis")]
#[async_trait] impl DeadManager for deadpool_redis::Manager {
impl Pool for deadpool_redis::Pool { fn new(config: &Config) -> Result<Self, Self::Error> {
type Connection = deadpool_redis::ConnectionWrapper; Self::new(config.url.as_str())
type InitError = deadpool_redis::redis::RedisError; }
type GetError = deadpool_redis::PoolError;
async fn initialize(db_name: &str, rocket: &Rocket<Build>)
-> std::result::Result<Self, Error<Self::InitError>>
{
let config = Config::from(db_name, rocket)?;
let manager = deadpool_redis::Manager::new(config.url).map_err(Error::Db)?;
let mut pool_config = deadpool_redis::PoolConfig::new(config.pool_size as usize);
pool_config.timeouts.wait = Some(std::time::Duration::from_secs(config.timeout.into()));
Ok(deadpool_redis::Pool::from_config(manager, pool_config))
} }
async fn get(&self) -> Result<Self::Connection, Self::GetError> { #[rocket::async_trait]
self.get().await impl<M: DeadManager, C: From<Object<M>>> crate::Pool for Pool<M, C>
where M::Type: Send, C: Send + Sync + 'static, M::Error: std::error::Error
{
type Error = Error<M::Error, PoolError<M::Error>>;
type Connection = C;
async fn init(figment: &Figment) -> Result<Self, Self::Error> {
let config: Config = figment.extract()?;
let manager = M::new(&config).map_err(Error::Init)?;
let mut pool = PoolConfig::new(config.max_connections);
pool.timeouts.create = Some(Duration::from_secs(config.connect_timeout));
pool.timeouts.wait = Some(Duration::from_secs(config.connect_timeout));
pool.timeouts.recycle = config.idle_timeout.map(Duration::from_secs);
pool.runtime = deadpool::Runtime::Tokio1;
Ok(Pool::from_config(manager, pool))
}
async fn get(&self) -> Result<Self::Connection, Self::Error> {
self.get().await.map_err(Error::Get)
}
}
}
#[cfg(feature = "sqlx")]
mod sqlx {
use sqlx::ConnectOptions;
use super::{Duration, Error, Config, Figment};
type Options<D> = <<D as sqlx::Database>::Connection as sqlx::Connection>::Options;
// Provide specialized configuration for particular databases.
fn specialize(__options: &mut dyn std::any::Any, __config: &Config) {
#[cfg(feature = "sqlx_sqlite")]
if let Some(o) = __options.downcast_mut::<sqlx::sqlite::SqliteConnectOptions>() {
*o = std::mem::take(o)
.busy_timeout(Duration::from_secs(__config.connect_timeout))
.create_if_missing(true);
}
}
#[rocket::async_trait]
impl<D: sqlx::Database> crate::Pool for sqlx::Pool<D> {
type Error = Error<sqlx::Error>;
type Connection = sqlx::pool::PoolConnection<D>;
async fn init(figment: &Figment) -> Result<Self, Self::Error> {
let config = figment.extract::<Config>()?;
let mut opts = config.url.parse::<Options<D>>().map_err(Error::Init)?;
opts.disable_statement_logging();
specialize(&mut opts, &config);
sqlx::pool::PoolOptions::new()
.max_connections(config.max_connections as u32)
.connect_timeout(Duration::from_secs(config.connect_timeout))
.idle_timeout(config.idle_timeout.map(Duration::from_secs))
.min_connections(config.min_connections.unwrap_or_default())
.connect_with(opts)
.await
.map_err(Error::Init)
}
async fn get(&self) -> Result<Self::Connection, Self::Error> {
self.acquire().await.map_err(Error::Get)
}
} }
} }
#[cfg(feature = "mongodb")] #[cfg(feature = "mongodb")]
#[async_trait] mod mongodb {
impl Pool for mongodb::Client { use mongodb::{Client, options::ClientOptions};
type Connection = mongodb::Client; use super::{Duration, Error, Config, Figment};
type InitError = mongodb::error::Error;
type GetError = std::convert::Infallible;
async fn initialize(db_name: &str, rocket: &Rocket<Build>) #[rocket::async_trait]
-> std::result::Result<Self, Error<Self::InitError>> impl crate::Pool for Client {
{ type Error = Error<mongodb::error::Error, std::convert::Infallible>;
let config = Config::from(db_name, rocket)?;
let mut options = mongodb::options::ClientOptions::parse(&config.url)
.await
.map_err(Error::Db)?;
options.max_pool_size = Some(config.pool_size);
options.wait_queue_timeout = Some(std::time::Duration::from_secs(config.timeout.into()));
mongodb::Client::with_options(options).map_err(Error::Db) type Connection = Client;
async fn init(figment: &Figment) -> Result<Self, Self::Error> {
let config = figment.extract::<Config>()?;
let mut opts = ClientOptions::parse(&config.url).await.map_err(Error::Init)?;
opts.min_pool_size = config.min_connections;
opts.max_pool_size = Some(config.max_connections as u32);
opts.max_idle_time = config.idle_timeout.map(Duration::from_secs);
opts.wait_queue_timeout = Some(Duration::from_secs(config.connect_timeout));
opts.connect_timeout = Some(Duration::from_secs(config.connect_timeout));
Client::with_options(opts).map_err(Error::Init)
} }
async fn get(&self) -> Result<Self::Connection, Self::GetError> { async fn get(&self) -> Result<Self::Connection, Self::Error> {
Ok(self.clone()) Ok(self.clone())
} }
} }
#[cfg(feature = "mysql_async")]
#[async_trait]
impl Pool for mysql_async::Pool {
type Connection = mysql_async::Conn;
type InitError = mysql_async::Error;
type GetError = mysql_async::Error;
async fn initialize(db_name: &str, rocket: &Rocket<Build>)
-> std::result::Result<Self, Error<Self::InitError>>
{
use rocket::figment::{self, error::{Actual, Kind}};
let config = Config::from(db_name, rocket)?;
let original_opts = mysql_async::Opts::from_url(&config.url)
.map_err(|_| figment::Error::from(Kind::InvalidValue(
Actual::Str(config.url.to_string()),
"mysql connection string".to_string()
)))?;
let new_pool_opts = original_opts.pool_opts()
.clone()
.with_constraints(
mysql_async::PoolConstraints::new(0, config.pool_size as usize)
.expect("usize can't be < 0")
);
// TODO: timeout
let opts = mysql_async::OptsBuilder::from_opts(original_opts)
.pool_opts(new_pool_opts);
Ok(mysql_async::Pool::new(opts))
}
async fn get(&self) -> std::result::Result<Self::Connection, Self::GetError> {
self.get_conn().await
}
}
#[cfg(feature = "sqlx_mysql")]
#[async_trait]
impl Pool for sqlx::MySqlPool {
type Connection = sqlx::pool::PoolConnection<sqlx::MySql>;
type InitError = sqlx::Error;
type GetError = sqlx::Error;
async fn initialize(db_name: &str, rocket: &Rocket<Build>)
-> std::result::Result<Self, Error<Self::InitError>>
{
use sqlx::ConnectOptions;
let config = Config::from(db_name, rocket)?;
let mut opts = config.url.parse::<sqlx::mysql::MySqlConnectOptions>()
.map_err(Error::Db)?;
opts.disable_statement_logging();
sqlx::pool::PoolOptions::new()
.max_connections(config.pool_size)
.connect_timeout(std::time::Duration::from_secs(config.timeout.into()))
.connect_with(opts)
.await
.map_err(Error::Db)
}
async fn get(&self) -> std::result::Result<Self::Connection, Self::GetError> {
self.acquire().await
}
}
#[cfg(feature = "sqlx_postgres")]
#[async_trait]
impl Pool for sqlx::PgPool {
type Connection = sqlx::pool::PoolConnection<sqlx::Postgres>;
type InitError = sqlx::Error;
type GetError = sqlx::Error;
async fn initialize(db_name: &str, rocket: &Rocket<Build>)
-> std::result::Result<Self, Error<Self::InitError>>
{
use sqlx::ConnectOptions;
let config = Config::from(db_name, rocket)?;
let mut opts = config.url.parse::<sqlx::postgres::PgConnectOptions>()
.map_err(Error::Db)?;
opts.disable_statement_logging();
sqlx::pool::PoolOptions::new()
.max_connections(config.pool_size)
.connect_timeout(std::time::Duration::from_secs(config.timeout.into()))
.connect_with(opts)
.await
.map_err(Error::Db)
}
async fn get(&self) -> std::result::Result<Self::Connection, Self::GetError> {
self.acquire().await
}
}
#[cfg(feature = "sqlx_sqlite")]
#[async_trait]
impl Pool for sqlx::SqlitePool {
type Connection = sqlx::pool::PoolConnection<sqlx::Sqlite>;
type InitError = sqlx::Error;
type GetError = sqlx::Error;
async fn initialize(db_name: &str, rocket: &Rocket<Build>)
-> std::result::Result<Self, Error<Self::InitError>>
{
use sqlx::ConnectOptions;
let config = Config::from(db_name, rocket)?;
let mut opts = config.url.parse::<sqlx::sqlite::SqliteConnectOptions>()
.map_err(Error::Db)?
.create_if_missing(true);
opts.disable_statement_logging();
dbg!(sqlx::pool::PoolOptions::new()
.max_connections(config.pool_size)
.connect_timeout(std::time::Duration::from_secs(config.timeout.into())))
.connect_with(opts)
.await
.map_err(Error::Db)
}
async fn get(&self) -> std::result::Result<Self::Connection, Self::GetError> {
self.acquire().await
}
} }

34
examples/databases/src/sqlx.rs
View File

@ -3,17 +3,14 @@ use rocket::fairing::{self, AdHoc};
use rocket::response::status::Created; use rocket::response::status::Created;
use rocket::serde::{Serialize, Deserialize, json::Json}; use rocket::serde::{Serialize, Deserialize, json::Json};
use rocket_db_pools::{sqlx, Database}; use rocket_db_pools::{sqlx, Database, Connection};
use futures::stream::TryStreamExt; use futures::{stream::TryStreamExt, future::TryFutureExt};
use futures::future::TryFutureExt;
#[derive(Database)] #[derive(Database)]
#[database("sqlx")] #[database("sqlx")]
struct Db(sqlx::SqlitePool); struct Db(sqlx::SqlitePool);
type Connection = rocket_db_pools::Connection<Db>;
type Result<T, E = rocket::response::Debug<sqlx::Error>> = std::result::Result<T, E>; type Result<T, E = rocket::response::Debug<sqlx::Error>> = std::result::Result<T, E>;
#[derive(Debug, Clone, Deserialize, Serialize)] #[derive(Debug, Clone, Deserialize, Serialize)]
@ -26,7 +23,7 @@ struct Post {
} }
#[post("/", data = "<post>")] #[post("/", data = "<post>")]
async fn create(mut db: Connection, post: Json<Post>) -> Result<Created<Json<Post>>> { async fn create(mut db: Connection<Db>, post: Json<Post>) -> Result<Created<Json<Post>>> {
// There is no support for `RETURNING`. // There is no support for `RETURNING`.
sqlx::query!("INSERT INTO posts (title, text) VALUES (?, ?)", post.title, post.text) sqlx::query!("INSERT INTO posts (title, text) VALUES (?, ?)", post.title, post.text)
.execute(&mut *db) .execute(&mut *db)
@ -36,7 +33,7 @@ async fn create(mut db: Connection, post: Json<Post>) -> Result<Created<Json<Pos
} }
#[get("/")] #[get("/")]
async fn list(mut db: Connection) -> Result<Json<Vec<i64>>> { async fn list(mut db: Connection<Db>) -> Result<Json<Vec<i64>>> {
let ids = sqlx::query!("SELECT id FROM posts") let ids = sqlx::query!("SELECT id FROM posts")
.fetch(&mut *db) .fetch(&mut *db)
.map_ok(|record| record.id) .map_ok(|record| record.id)
@ -47,7 +44,7 @@ async fn list(mut db: Connection) -> Result<Json<Vec<i64>>> {
} }
#[get("/<id>")] #[get("/<id>")]
async fn read(mut db: Connection, id: i64) -> Option<Json<Post>> { async fn read(mut db: Connection<Db>, id: i64) -> Option<Json<Post>> {
sqlx::query!("SELECT id, title, text FROM posts WHERE id = ?", id) sqlx::query!("SELECT id, title, text FROM posts WHERE id = ?", id)
.fetch_one(&mut *db) .fetch_one(&mut *db)
.map_ok(|r| Json(Post { id: Some(r.id), title: r.title, text: r.text })) .map_ok(|r| Json(Post { id: Some(r.id), title: r.title, text: r.text }))
@ -56,7 +53,7 @@ async fn read(mut db: Connection, id: i64) -> Option<Json<Post>> {
} }
#[delete("/<id>")] #[delete("/<id>")]
async fn delete(mut db: Connection, id: i64) -> Result<Option<()>> { async fn delete(mut db: Connection<Db>, id: i64) -> Result<Option<()>> {
let result = sqlx::query!("DELETE FROM posts WHERE id = ?", id) let result = sqlx::query!("DELETE FROM posts WHERE id = ?", id)
.execute(&mut *db) .execute(&mut *db)
.await?; .await?;
@ -65,20 +62,20 @@ async fn delete(mut db: Connection, id: i64) -> Result<Option<()>> {
} }
#[delete("/")] #[delete("/")]
async fn destroy(mut db: Connection) -> Result<()> { async fn destroy(mut db: Connection<Db>) -> Result<()> {
sqlx::query!("DELETE FROM posts").execute(&mut *db).await?; sqlx::query!("DELETE FROM posts").execute(&mut *db).await?;
Ok(()) Ok(())
} }
async fn init_db(rocket: Rocket<Build>) -> fairing::Result { async fn run_migrations(rocket: Rocket<Build>) -> fairing::Result {
match rocket.state::<Db>() { match Db::fetch(&rocket) {
Some(db) => { Some(db) => match sqlx::migrate!("db/sqlx/migrations").run(&**db).await {
if let Err(e) = sqlx::migrate!("db/sqlx/migrations").run(db.pool()).await { Ok(_) => Ok(rocket),
Err(e) => {
error!("Failed to initialize SQLx database: {}", e); error!("Failed to initialize SQLx database: {}", e);
return Err(rocket); Err(rocket)
} }
Ok(rocket)
} }
None => Err(rocket), None => Err(rocket),
} }
@ -86,9 +83,8 @@ async fn init_db(rocket: Rocket<Build>) -> fairing::Result {
pub fn stage() -> AdHoc { pub fn stage() -> AdHoc {
AdHoc::on_ignite("SQLx Stage", |rocket| async { AdHoc::on_ignite("SQLx Stage", |rocket| async {
rocket rocket.attach(Db::init())
.attach(Db::fairing()) .attach(AdHoc::try_on_ignite("SQLx Migrations", run_migrations))
.attach(AdHoc::try_on_ignite("SQLx Database", init_db))
.mount("/sqlx", routes![list, create, read, delete, destroy]) .mount("/sqlx", routes![list, create, read, delete, destroy])
}) })
} }

3
scripts/mk-docs.sh
View File

@ -21,7 +21,8 @@ echo ":::: Generating the docs..."
pushd "${PROJECT_ROOT}" > /dev/null 2>&1 pushd "${PROJECT_ROOT}" > /dev/null 2>&1
# Set the crate version and fill in missing doc URLs with docs.rs links. # Set the crate version and fill in missing doc URLs with docs.rs links.
RUSTDOCFLAGS="-Zunstable-options --crate-version ${DOC_VERSION}" \ RUSTDOCFLAGS="-Zunstable-options --crate-version ${DOC_VERSION}" \
cargo doc -p rocket -p rocket_sync_db_pools -p rocket_dyn_templates \ cargo doc -p rocket \
-p rocket_sync_db_pools -p rocket_dyn_templates -p rocket_db_pools \
-Zrustdoc-map --no-deps --all-features -Zrustdoc-map --no-deps --all-features
popd > /dev/null 2>&1 popd > /dev/null 2>&1

8
scripts/test.sh
View File

@ -74,13 +74,13 @@ function indir() {
function test_contrib() { function test_contrib() {
DB_POOLS_FEATURES=( DB_POOLS_FEATURES=(
deadpool-postgres deadpool_postgres
deadpool-redis deadpool_redis
mongodb
mysql_async
sqlx_mysql sqlx_mysql
sqlx_postgres sqlx_postgres
sqlx_sqlite sqlx_sqlite
sqlx_mssql
mongodb
) )
SYNC_DB_POOLS_FEATURES=( SYNC_DB_POOLS_FEATURES=(