redis-rs
Redis-rs is a high level redis library for Rust. It provides convenient access to all Redis functionality through a very flexible but low-level API. It uses a customizable type conversion trait so that any operation can return results in just the type you are expecting. This makes for a very pleasant development experience.
The crate is called redis
and you can depend on it via cargo:
[dependencies]
redis = "0.22.1"
Documentation on the library can be found at docs.rs/redis.
Note: redis-rs requires at least Rust 1.59.
Basic Operation
To open a connection you need to create a client and then to fetch a connection from it. In the future there will be a connection pool for those, currently each connection is separate and not pooled.
Many commands are implemented through the Commands
trait but manual
command creation is also possible.
extern crate redis;
use redis::Commands;
fn fetch_an_integer() -> redis::RedisResult<isize> {
// connect to redis
let client = redis::Client::open("redis://127.0.0.1/")?;
let mut con = client.get_connection()?;
// throw away the result, just make sure it does not fail
let _ : () = con.set("my_key", 42)?;
// read back the key and return it. Because the return value
// from the function is a result for integer this will automatically
// convert into one.
con.get("my_key")
}
Async support
To enable asynchronous clients a feature for the underlying feature need to be activated.
# if you use tokio
redis = { version = "0.22.1", features = ["tokio-comp"] }
# if you use async-std
redis = { version = "0.22.1", features = ["async-std-comp"] }
TLS Support
To enable TLS support, you need to use the relevant feature entry in your Cargo.toml.
redis = { version = "0.22.1", features = ["tls"] }
# if you use tokio
redis = { version = "0.22.1", features = ["tokio-native-tls-comp"] }
# if you use async-std
redis = { version = "0.22.1", features = ["async-std-tls-comp"] }
then you should be able to connect to a redis instance using the rediss://
URL scheme:
let client = redis::Client::open("rediss://127.0.0.1/")?;
Cluster Support
Cluster mode can be used by specifying "cluster" as a features entry in your Cargo.toml.
redis = { version = "0.22.1", features = [ "cluster"] }
Then you can simply use the ClusterClient
which accepts a list of available nodes.
use redis::cluster::ClusterClient;
use redis::Commands;
fn fetch_an_integer() -> String {
// connect to redis
let nodes = vec!["redis://127.0.0.1/"];
let client = ClusterClient::open(nodes).unwrap();
let mut connection = client.get_connection().unwrap();
let _: () = connection.set("test", "test_data").unwrap();
let rv: String = connection.get("test").unwrap();
return rv;
}
JSON Support
Support for the RedisJSON Module can be enabled by specifying "json" as a feature in your Cargo.toml.
redis = { version = "0.22.1", features = ["json"] }
Then you can simply import the JsonCommands
trait which will add the json
commands to all Redis Connections (not to be confused with just Commands
which only adds the default commands)
use redis::Client;
use redis::JsonCommands;
use redis::RedisResult;
use redis::ToRedisArgs;
// Result returns Ok(true) if the value was set
// Result returns Err(e) if there was an error with the server itself OR serde_json was unable to serialize the boolean
fn set_json_bool<P: ToRedisArgs>(key: P, path: P, b: bool) -> RedisResult<bool> {
let client = Client::open("redis://127.0.0.1").unwrap();
let connection = client.get_connection().unwrap();
// runs `JSON.SET {key} {path} {b}`
connection.json_set(key, path, b)?
// you'll need to use serde_json (or some other json lib) to deserialize the results from the bytes
// It will always be a Vec, if no results were found at the path it'll be an empty Vec
}
Development
To test redis
you're going to need to be able to test with the Redis Modules, to do this
you must set the following envornment variables before running the test script
REDIS_RS_REDIS_JSON_PATH
= The absolute path to the RedisJSON module (Usually calledlibrejson.so
).
If you want to develop on the library there are a few commands provided by the makefile:
To build:
$ make
To test:
$ make test
To run benchmarks:
$ make bench
To build the docs (require nightly compiler, see rust-lang/rust#43781):
$ make docs
We encourage you to run clippy
prior to seeking a merge for your work. The lints can be quite strict. Running this on your own workstation can save you time, since Travis CI will fail any build that doesn't satisfy clippy
:
$ cargo clippy --all-features --all --tests --examples -- -D clippy::all -D warnings
To run fuzz tests with afl, first install cargo-afl (cargo install -f afl
),
then run:
$ make fuzz
If the fuzzer finds a crash, in order to reproduce it, run:
$ cd afl/<target>/
$ cargo run --bin reproduce -- out/crashes/<crashfile>