Struct redis::Client

pub struct Client { /* private fields */ }

The client type.

Implementations

impl Client

The client acts as connector to the redis server. By itself it does not do much other than providing a convenient way to fetch a connection from it. In the future the plan is to provide a connection pool in the client.

When opening a client a URL in the following format should be used:

redis://host:port/db

Example usage::

let client = redis::Client::open("redis://127.0.0.1/").unwrap();
let con = client.get_connection().unwrap();

pub fn open<T: IntoConnectionInfo>(params: T) -> RedisResult<Client>

Connects to a redis server and returns a client. This does not actually open a connection yet but it does perform some basic checks on the URL that might make the operation fail.

pub fn get_connection(&self) -> RedisResult<Connection>

Instructs the client to actually connect to redis and returns a connection object. The connection object can be used to send commands to the server. This can fail with a variety of errors (like unreachable host) so it’s important that you handle those errors.

pub fn get_connection_with_timeout( &self, timeout: Duration ) -> RedisResult<Connection>

Instructs the client to actually connect to redis with specified timeout and returns a connection object. The connection object can be used to send commands to the server. This can fail with a variety of errors (like unreachable host) so it’s important that you handle those errors.

pub fn get_connection_info(&self) -> &ConnectionInfo

Returns a reference of client connection info object.

impl Client

To enable async support you need to chose one of the supported runtimes and active its corresponding feature: tokio-comp or async-std-comp

pub async fn get_async_connection(&self) -> RedisResult<Connection>

👎Deprecated: aio::Connection is deprecated. Use client::get_multiplexed_async_connection instead.

Available on crate feature aio only.

Returns an async connection from the client.

pub async fn get_tokio_connection(&self) -> RedisResult<Connection>

👎Deprecated: aio::Connection is deprecated. Use client::get_multiplexed_tokio_connection instead.

Available on crate features aio and tokio-comp only.

Returns an async connection from the client.

pub async fn get_async_std_connection(&self) -> RedisResult<Connection>

👎Deprecated: aio::Connection is deprecated. Use client::get_multiplexed_async_std_connection instead.

Available on crate features aio and async-std-comp only.

Returns an async connection from the client.

pub async fn get_multiplexed_async_connection( &self ) -> RedisResult<MultiplexedConnection>

Available on crate feature aio and (crate features tokio-comp or async-std-comp) only.

Returns an async connection from the client.

pub async fn get_multiplexed_async_connection_with_timeouts( &self, response_timeout: Duration, connection_timeout: Duration ) -> RedisResult<MultiplexedConnection>

Available on crate feature aio and (crate features tokio-comp or async-std-comp) only.

Returns an async connection from the client.

pub async fn get_multiplexed_tokio_connection_with_response_timeouts( &self, response_timeout: Duration, connection_timeout: Duration ) -> RedisResult<MultiplexedConnection>

Available on crate features aio and tokio-comp only.

Returns an async multiplexed connection from the client.

A multiplexed connection can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub async fn get_multiplexed_tokio_connection( &self ) -> RedisResult<MultiplexedConnection>

Available on crate features aio and tokio-comp only.

Returns an async multiplexed connection from the client.

A multiplexed connection can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub async fn get_multiplexed_async_std_connection_with_timeouts( &self, response_timeout: Duration, connection_timeout: Duration ) -> RedisResult<MultiplexedConnection>

Available on crate features aio and async-std-comp only.

Returns an async multiplexed connection from the client.

A multiplexed connection can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub async fn get_multiplexed_async_std_connection( &self ) -> RedisResult<MultiplexedConnection>

Available on crate features aio and async-std-comp only.

Returns an async multiplexed connection from the client.

A multiplexed connection can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub async fn create_multiplexed_tokio_connection_with_response_timeout( &self, response_timeout: Duration ) -> RedisResult<(MultiplexedConnection, impl Future<Output = ()>)>

Available on crate features aio and tokio-comp only.

Returns an async multiplexed connection from the client and a future which must be polled to drive any requests submitted to it (see get_multiplexed_tokio_connection).

A multiplexed connection can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket). The multiplexer will return a timeout error on any request that takes longer then response_timeout.

pub async fn create_multiplexed_tokio_connection( &self ) -> RedisResult<(MultiplexedConnection, impl Future<Output = ()>)>

Available on crate features aio and tokio-comp only.

Returns an async multiplexed connection from the client and a future which must be polled to drive any requests submitted to it (see get_multiplexed_tokio_connection).

A multiplexed connection can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub async fn create_multiplexed_async_std_connection_with_response_timeout( &self, response_timeout: Duration ) -> RedisResult<(MultiplexedConnection, impl Future<Output = ()>)>

Available on crate features aio and async-std-comp only.

Returns an async multiplexed connection from the client and a future which must be polled to drive any requests submitted to it (see get_multiplexed_tokio_connection).

A multiplexed connection can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket). The multiplexer will return a timeout error on any request that takes longer then [response_timeout].

pub async fn create_multiplexed_async_std_connection( &self ) -> RedisResult<(MultiplexedConnection, impl Future<Output = ()>)>

Available on crate features aio and async-std-comp only.

Returns an async multiplexed connection from the client and a future which must be polled to drive any requests submitted to it (see get_multiplexed_tokio_connection).

A multiplexed connection can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub async fn get_tokio_connection_manager( &self ) -> RedisResult<ConnectionManager>

👎Deprecated: use get_connection_manager instead

Available on crate features aio and connection-manager only.

Returns an async ConnectionManager from the client.

The connection manager wraps a MultiplexedConnection. If a command to that connection fails with a connection error, then a new connection is established in the background and the error is returned to the caller.

This means that on connection loss at least one command will fail, but the connection will be re-established automatically if possible. Please refer to the ConnectionManager docs for detailed reconnecting behavior.

A connection manager can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub async fn get_connection_manager(&self) -> RedisResult<ConnectionManager>

Available on crate features aio and connection-manager only.

Returns an async ConnectionManager from the client.

The connection manager wraps a MultiplexedConnection. If a command to that connection fails with a connection error, then a new connection is established in the background and the error is returned to the caller.

This means that on connection loss at least one command will fail, but the connection will be re-established automatically if possible. Please refer to the ConnectionManager docs for detailed reconnecting behavior.

A connection manager can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub async fn get_tokio_connection_manager_with_backoff( &self, exponent_base: u64, factor: u64, number_of_retries: usize ) -> RedisResult<ConnectionManager>

👎Deprecated: use get_connection_manager_with_backoff instead

Available on crate features aio and connection-manager only.

Returns an async ConnectionManager from the client.

The connection manager wraps a MultiplexedConnection. If a command to that connection fails with a connection error, then a new connection is established in the background and the error is returned to the caller.

This means that on connection loss at least one command will fail, but the connection will be re-established automatically if possible. Please refer to the ConnectionManager docs for detailed reconnecting behavior.

A connection manager can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub async fn get_tokio_connection_manager_with_backoff_and_timeouts( &self, exponent_base: u64, factor: u64, number_of_retries: usize, response_timeout: Duration, connection_timeout: Duration ) -> RedisResult<ConnectionManager>

Available on crate features aio and connection-manager only.

Returns an async ConnectionManager from the client.

The connection manager wraps a MultiplexedConnection. If a command to that connection fails with a connection error, then a new connection is established in the background and the error is returned to the caller.

This means that on connection loss at least one command will fail, but the connection will be re-established automatically if possible. Please refer to the ConnectionManager docs for detailed reconnecting behavior.

A connection manager can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub async fn get_connection_manager_with_backoff( &self, exponent_base: u64, factor: u64, number_of_retries: usize ) -> RedisResult<ConnectionManager>

Available on crate features aio and connection-manager only.

Returns an async ConnectionManager from the client.

The connection manager wraps a MultiplexedConnection. If a command to that connection fails with a connection error, then a new connection is established in the background and the error is returned to the caller.

This means that on connection loss at least one command will fail, but the connection will be re-established automatically if possible. Please refer to the ConnectionManager docs for detailed reconnecting behavior.

A connection manager can be cloned, allowing requests to be be sent concurrently on the same underlying connection (tcp/unix socket).

pub fn build_with_tls<C: IntoConnectionInfo>( conn_info: C, tls_certs: TlsCertificates ) -> RedisResult<Client>

Available on crate feature aio only.

Constructs a new Client with parameters necessary to create a TLS connection.

• conn_info - URL using the rediss:// scheme.
• tls_certs - TlsCertificates structure containing: – client_tls - Optional ClientTlsConfig containing byte streams for — client_cert - client’s byte stream containing client certificate in PEM format — client_key - client’s byte stream containing private key in PEM format – root_cert - Optional byte stream yielding PEM formatted file for root certificates.

If ClientTlsConfig ( cert+key pair ) is not provided, then client-side authentication is not enabled. If root_cert is not provided, then system root certificates are used instead.

Examples

use std::{fs::File, io::{BufReader, Read}};

use redis::{Client, AsyncCommands as _, TlsCertificates, ClientTlsConfig};

async fn do_redis_code(
    url: &str,
    root_cert_file: &str,
    cert_file: &str,
    key_file: &str
) -> redis::RedisResult<()> {
    let root_cert_file = File::open(root_cert_file).expect("cannot open private cert file");
    let mut root_cert_vec = Vec::new();
    BufReader::new(root_cert_file)
        .read_to_end(&mut root_cert_vec)
        .expect("Unable to read ROOT cert file");

    let cert_file = File::open(cert_file).expect("cannot open private cert file");
    let mut client_cert_vec = Vec::new();
    BufReader::new(cert_file)
        .read_to_end(&mut client_cert_vec)
        .expect("Unable to read client cert file");

    let key_file = File::open(key_file).expect("cannot open private key file");
    let mut client_key_vec = Vec::new();
    BufReader::new(key_file)
        .read_to_end(&mut client_key_vec)
        .expect("Unable to read client key file");

    let client = Client::build_with_tls(
        url,
        TlsCertificates {
            client_tls: Some(ClientTlsConfig{
                client_cert: client_cert_vec,
                client_key: client_key_vec,
            }),
            root_cert: Some(root_cert_vec),
        }
    )
    .expect("Unable to build client");

    let connection_info = client.get_connection_info();

    println!(">>> connection info: {connection_info:?}");

    let mut con = client.get_async_connection().await?;

    con.set("key1", b"foo").await?;

    redis::cmd("SET")
        .arg(&["key2", "bar"])
        .query_async(&mut con)
        .await?;

    let result = redis::cmd("MGET")
        .arg(&["key1", "key2"])
        .query_async(&mut con)
        .await;
    assert_eq!(result, Ok(("foo".to_string(), b"bar".to_vec())));
    println!("Result from MGET: {result:?}");

    Ok(())
}

pub async fn get_async_pubsub(&self) -> RedisResult<PubSub>

Available on crate feature aio only.

Returns an async receiver for pub-sub messages.

pub async fn get_async_monitor(&self) -> RedisResult<Monitor>

Available on crate feature aio only.

Returns an async receiver for monitor messages.

Trait Implementations

impl Clone for Client

fn clone(&self) -> Client

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl ConnectionLike for Client

fn req_packed_command(&mut self, cmd: &[u8]) -> RedisResult<Value>

Sends an already encoded (packed) command into the TCP socket and reads the single response from it.

fn get_db(&self) -> i64

Returns the database this connection is bound to. Note that this information might be unreliable because it’s initially cached and also might be incorrect if the connection like object is not actually connected.

fn check_connection(&mut self) -> bool

Check that all connections it has are available (PING internally).

fn is_open(&self) -> bool

Returns the connection status.

fn req_command(&mut self, cmd: &Cmd) -> RedisResult<Value>

Sends a Cmd into the TCP socket and reads a single response from it.

impl Debug for Client

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl ManageConnection for Client

Available on crate feature r2d2 only.

type Connection = Connection

The connection type this manager deals with.

type Error = RedisError

The error type returned by Connections.

fn connect(&self) -> Result<Self::Connection, Self::Error>

Attempts to create a new connection.

fn is_valid(&self, conn: &mut Self::Connection) -> Result<(), Self::Error>

Determines if the connection is still connected to the database.

fn has_broken(&self, conn: &mut Self::Connection) -> bool

Quickly determines if the connection is no longer usable.