Serenity is a Rust library for the Discord API.
View the examples on how to make and structure a bot.
Serenity supports bot login via the use of Client::builder
.
You may also check your tokens prior to login via the use of
validate_token
.
Once logged in, you may add handlers to your client to dispatch Event
s,
by implementing the handlers in a trait, such as EventHandler::message
.
This will cause your handler to be called when a Event::MessageCreate
is
received. Each handler is given a Context
, giving information about the
event. See the client's module-level documentation.
The Shard
is transparently handled by the library, removing
unnecessary complexity. Sharded connections are automatically handled for
you. See the gateway's documentation for more information.
A Cache
is also provided for you. This will be updated automatically for
you as data is received from the Discord API via events. When calling a
method on a Context
, the cache will first be searched for relevant data
to avoid unnecessary HTTP requests to the Discord API. For more information,
see the cache's module-level documentation.
Note that - although this documentation will try to be as up-to-date and accurate as possible - Discord hosts official documentation. If you need to be sure that some information piece is accurate, refer to their docs.
A basic ping-pong bot looks like:
use serenity::async_trait;
use serenity::client::{Client, Context, EventHandler};
use serenity::model::channel::Message;
use serenity::framework::standard::{
StandardFramework,
CommandResult,
macros::{
command,
group
}
};
use std::env;
#[group]
#[commands(ping)]
struct General;
struct Handler;
#[async_trait]
impl EventHandler for Handler {}
#[tokio::main]
async fn main() {
let framework = StandardFramework::new()
.configure(|c| c.prefix("~")) // set the bot's prefix to "~"
.group(&GENERAL_GROUP);
// Login with a bot token from the environment
let token = env::var("DISCORD_TOKEN").expect("token");
let mut client = Client::builder(token)
.event_handler(Handler)
.framework(framework)
.await
.expect("Error creating client");
// start listening for events by starting a single shard
if let Err(why) = client.start().await {
println!("An error occurred while running the client: {:?}", why);
}
}
#[command]
async fn ping(ctx: &Context, msg: &Message) -> CommandResult {
msg.reply(ctx, "Pong!").await?;
Ok(())
}
Full examples, detailing and explaining usage of the basic functionality of the
library, can be found in the examples
directory.
Add the following to your Cargo.toml
file:
[dependencies]
serenity = "0.10"
Serenity supports a minimum of Rust 1.51.
Features can be enabled or disabled by configuring the library through Cargo.toml:
[dependencies.serenity]
default-features = false
features = ["pick", "your", "feature", "names", "here"]
version = "0.10"
The default features are: builder
, cache
, client
, framework
, gateway
,
http
, model
, standard_framework
, utils
, and rustls_backend
.
There are these alternative default features, they require to set default-features = false
:
- default_tokio_0_2: Uses the default backend with
tokio
version0.2
. - default_native_tls: Uses
native_tls_backend
instead of the defaultrustls_backend
. - default_native_tls_tokio_0_2: Uses
native_tls_backend
withtokio
version0.2
. - default_no_backend: Excludes the default backend, pick your own backend instead.
If you are unsure which to pick, use the default features by not setting default-features = false
.
The following is a full list of features:
- builder: The builders used in conjunction with models' methods.
- cache: The cache will store information about guilds, channels, users, and other data, to avoid performing REST requests. If you are low on RAM, do not enable this.
- collector: A collector awaits events, such as receiving a message from a user or reactions on a message, and allows for responding to the events in a convenient fashion. Collectors can be configured to enforce certain criteria the events must meet.
- client: A manager for shards and event handlers, abstracting away the work of handling shard events and updating the cache, if enabled.
- framework: Enables the framework, which is a utility to allow simple command parsing, before/after command execution, prefix setting, and more.
- gateway: A Shard, used as a higher-level interface for communicating with the Discord gateway over a WebSocket client.
- http: Functions providing a wrapper over Discord's REST API at a low enough level that optional parameters can be provided at will via a JsonMap.
- model: Method implementations for models, acting as helper methods over the HTTP functions.
- standard_framework: A standard, default implementation of the Framework
- utils: Utility functions for common use cases by users.
- voice: Enables registering a voice plugin to the client, which will handle actual voice connections from Discord. lavalink-rs or Songbird are recommended voice plugins.
- default_native_tls: Default features but using
native_tls_backend
instead ofrustls_backend
. - absolute_ratelimits: Whether the library should use your system clock to avoid ratelimits, or use the interval given by Discord that might be less efficient due to latency in the network. If you turn this feature on, it is recommended to synchronise your clock with an NTP server (such as Google's).
- tokio_task_builder: Enables tokio's
tracing
feature and usestokio::task::Builder
to spawn tasks with names ifRUSTFLAGS="--cfg tokio_unstable
is set. - unstable_discord_api: Enables features of the Discord API that do not have a stable interface. The features might not have official documentation or are subject to change.
Serenity offers two TLS-backends, rustls_backend
by default, you need to pick
one if you do not use the default features:
- rustls_backend: Uses Rustls for all platforms, a pure Rust TLS implementation.
- native_tls_backend: Uses SChannel on Windows, Secure Transport on macOS, and OpenSSL on other platforms.
If you need to use tokio
version 0.2
use the backends below:
- rustls_tokio_0_2_backend: Combines rustls_backend with
tokio
version0.2
. - native_tls_tokio_0_2_backend: Combines native_tls_backend with
tokio
version0.2
.
If you want all of the default features except for cache
for example, you can
list all but that:
[dependencies.serenity]
default-features = false
features = [
"builder",
"client",
"framework",
"gateway",
"http",
"model",
"standard_framework",
"utils",
"rustls_backend",
]
version = "0.10"
If you use the native_tls_backend
and you are not developing on macOS or Windows, you will need:
- openssl
- lavalink-rs: An interface to Lavalink, an audio sending node based on Lavaplayer
- Songbird: An async Rust library for the Discord voice API.
- Poise: Experimental command framework, with advanced features like edit tracking, single function slash and prefix commands and flexible argument parsing.