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https://github.com/importcjj/mobc
A generic connection pool for Rust with async/await support
https://github.com/importcjj/mobc
async await connection-pool database pool postgres redis rust rust-lang
Last synced: about 2 months ago
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A generic connection pool for Rust with async/await support
- Host: GitHub
- URL: https://github.com/importcjj/mobc
- Owner: importcjj
- License: apache-2.0
- Created: 2019-10-23T15:27:15.000Z (almost 5 years ago)
- Default Branch: main
- Last Pushed: 2024-04-30T12:20:28.000Z (5 months ago)
- Last Synced: 2024-07-18T05:39:11.747Z (2 months ago)
- Topics: async, await, connection-pool, database, pool, postgres, redis, rust, rust-lang
- Language: Rust
- Homepage: https://docs.rs/mobc
- Size: 272 KB
- Stars: 281
- Watchers: 8
- Forks: 39
- Open Issues: 11
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE-APACHE
Awesome Lists containing this project
README
# Mobc
A generic connection pool with async/await support.
Inspired by Deadpool, Sqlx, r2d2 and Golang SQL package.
[Changelog](https://github.com/importcjj/mobc/blob/main/CHANGELOG.md)
**Note: mobc requires at least Rust 1.60.**
## Usage
```toml
[dependencies]
mobc = "0.8"
# For async-std runtime
# mobc = { version = "0.8", features = ["async-std"] }
# For actix-rt 1.0
# mobc = { version = "0.8", features = ["actix-rt"] }
```
## Features
- Support async/.await syntax
- Support both `tokio` and `async-std`
- Tokio metric support
- Production battle tested
- High performance
- Easy to customize
- Dynamic configuration
## Adaptors
| Backend | Adaptor Crate |
| ----------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- |
| [bolt-client](https://crates.io/crates/bolt-client) | [mobc-bolt](https://crates.io/crates/mobc-bolt) |
| [tokio-postgres](https://github.com/sfackler/rust-postgres) | [mobc-postgres](https://github.com/importcjj/mobc-postgres) |
| [redis](https://github.com/mitsuhiko/redis-rs) | [mobc-redis](https://github.com/importcjj/mobc-redis) |
| [arangodb](https://github.com/fMeow/arangors) | [mobc-arangors](https://github.com/inzanez/mobc-arangors) |
| [lapin](https://github.com/CleverCloud/lapin) | [mobc-lapin](https://github.com/zupzup/mobc-lapin) |
| [reql](https://github.com/rethinkdb/rethinkdb-rs) | [mobc-reql](https://github.com/rethinkdb/rethinkdb-rs) |
| [redis-cluster](https://docs.rs/redis_cluster_async/0.6.0/redis_cluster_async/index.html) | [mobc-redis-cluster](https://github.com/rogeriob2br/mobc-redis-cluster) |
More DB adaptors are welcome.
## Examples
More [examples](https://github.com/importcjj/mobc/tree/main/examples)
Using an imaginary "foodb" database.
```rust
use mobc::{async_trait, Manager};
#[derive(Debug)]
pub struct FooError;
pub struct FooConnection;
impl FooConnection {
pub async fn query(&self) -> String {
"PONG".to_string()
}
}
pub struct FooManager;
#[async_trait]
impl Manager for FooManager {
type Connection = FooConnection;
type Error = FooError;
async fn connect(&self) -> Result {
Ok(FooConnection)
}
async fn check(&self, conn: Self::Connection) -> Result {
Ok(conn)
}
}
```
## Configures
#### max_open
Sets the maximum number of connections managed by the pool.
> 0 means unlimited, defaults to 10.
#### max_idle
Sets the maximum idle connection count maintained by the pool. The pool will maintain at most this many idle connections at all times, while respecting the value of max_open.
#### max_lifetime
Sets the maximum lifetime of connections in the pool. Expired connections may be closed lazily before reuse.
> None meas reuse forever, defaults to None.
#### get_timeout
Sets the get timeout used by the pool. Calls to Pool::get will wait this long for a connection to become available before returning an error.
> None meas never timeout, defaults to 30 seconds.
## Variable
Some of the connection pool configurations can be adjusted dynamically. Each connection pool instance has the following methods:
- set_max_open_conns
- set_max_idle_conns
- set_conn_max_lifetime
## Stats
- max_open - Maximum number of open connections to the database.
- connections - The number of established connections both in use and idle.
- in_use - The number of connections currently in use.
- idle - The number of idle connections.
- wait_count - The total number of connections waited for.
- wait_duration - The total time blocked waiting for a new connection.
- max_idle_closed - The total number of connections closed due to max_idle.
- max_lifetime_closed - The total number of connections closed due to max_lifetime.
## Metrics
- Counters
- `mobc_pool_connections_opened_total` - Total number of Pool Connections opened
- `mobc_pool_connections_closed_total` - Total number of Pool Connections closed
- Gauges
- `mobc_pool_connections_open` - Number of currently open Pool Connections
- `mobc_pool_connections_busy` - Number of currently busy Pool Connections (executing a database query)"
- `mobc_pool_connections_idle` - Number of currently unused Pool Connections (waiting for the next pool query to run)
- `mobc_client_queries_wait` - Number of queries currently waiting for a connection
- Histograms
- `mobc_client_queries_wait_histogram_ms` - Histogram of the wait time of all queries in ms
## Compatibility
Because tokio is not compatible with other runtimes, such as async-std. So a database driver written with tokio cannot run in the async-std runtime. For example, you can't use redis-rs in tide because it uses tokio, so the connection pool which bases on redis-res can't be used in tide either.