/
lib.rs
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/
lib.rs
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//! This crate provides one-time notification messages, or flash messages, for
//! `axum` applications.
//!
//! # Example
//!
//! ```rust,no_run
//! use std::net::SocketAddr;
//!
//! use axum::{
//! response::{IntoResponse, Redirect},
//! routing::get,
//! Router,
//! };
//! use axum_messages::{Messages, MessagesManagerLayer};
//! use tower_sessions::{MemoryStore, SessionManagerLayer};
//!
//! async fn set_messages_handler(messages: Messages) -> impl IntoResponse {
//! messages
//! .info("Hello, world!")
//! .debug("This is a debug message.");
//!
//! Redirect::to("/read-messages")
//! }
//!
//! async fn read_messages_handler(messages: Messages) -> impl IntoResponse {
//! let messages = messages
//! .into_iter()
//! .map(|message| format!("{}: {}", message.level, message))
//! .collect::<Vec<_>>()
//! .join(", ");
//!
//! if messages.is_empty() {
//! "No messages yet!".to_string()
//! } else {
//! messages
//! }
//! }
//!
//! #[tokio::main]
//! async fn main() {
//! let session_store = MemoryStore::default();
//! let session_layer = SessionManagerLayer::new(session_store).with_secure(false);
//!
//! let app = Router::new()
//! .route("/", get(set_messages_handler))
//! .route("/read-messages", get(read_messages_handler))
//! .layer(MessagesManagerLayer)
//! .layer(session_layer);
//!
//! let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
//! let listener = tokio::net::TcpListener::bind(&addr).await.unwrap();
//! axum::serve(listener, app.into_make_service())
//! .await
//! .unwrap();
//! }
//! ```
#![warn(
clippy::all,
nonstandard_style,
future_incompatible,
missing_debug_implementations
)]
#![deny(missing_docs)]
#![forbid(unsafe_code)]
use core::fmt;
use std::{
collections::{HashMap, VecDeque},
future::Future,
pin::Pin,
sync::{
atomic::{self, AtomicBool},
Arc,
},
task::{Context, Poll},
};
use async_trait::async_trait;
use axum_core::{
extract::{FromRequestParts, Request},
response::Response,
};
use http::{request::Parts, StatusCode};
use parking_lot::Mutex;
use serde::{Deserialize, Serialize};
use tower::{Layer, Service};
use tower_sessions_core::{session, Session};
// N.B.: Code structure directly borrowed from `axum-flash`: https://github.com/davidpdrsn/axum-flash/blob/5e8b2bded97fd10bb275d5bc66f4d020dec465b9/src/lib.rs
/// Mapping of key-value pairs which provide additional context to the message.
pub type Metadata = HashMap<String, serde_json::Value>;
/// Container for a message which provides a level and message content.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Message {
/// Message level, i.e. `Level`.
#[serde(rename = "l")]
pub level: Level,
/// The message itself.
#[serde(rename = "m")]
pub message: String,
/// Additional context related to the message.
#[serde(rename = "d")]
pub metadata: Option<Metadata>,
}
impl fmt::Display for Message {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(&self.message)
}
}
type MessageQueue = VecDeque<Message>;
/// Enumeration of message levels.
///
/// This folllows directly from the [Django
/// implementation][django-message-levels].
///
/// [django-message-levels]: https://docs.djangoproject.com/en/5.0/ref/contrib/messages/#message-levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
pub enum Level {
/// Development-related messages that will be ignored (or removed) in a
/// production deployment.
Debug = 0,
/// Informational messages for the user.
Info = 1,
/// An action was successful, e.g. “Your profile was updated successfully”.
Success = 2,
/// A failure did not occur but may be imminent.
Warning = 3,
/// An action was not successful or some other failure occurred.
Error = 4,
}
impl fmt::Display for Level {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(match self {
Self::Debug => "Debug",
Self::Info => "Info",
Self::Success => "Success",
Self::Warning => "Warning",
Self::Error => "Error",
})
}
}
#[derive(Debug, Clone, Default, Deserialize, Serialize)]
struct Data {
pending_messages: MessageQueue,
messages: MessageQueue,
}
/// An extractor which holds the state of messages, using the session to ensure
/// messages are persisted between requests.
#[derive(Debug, Clone)]
pub struct Messages {
session: Session,
data: Arc<Mutex<Data>>,
is_modified: Arc<AtomicBool>,
}
impl Messages {
const DATA_KEY: &'static str = "axum-messages.data";
fn new(session: Session, data: Data) -> Self {
Self {
session,
data: Arc::new(Mutex::new(data)),
is_modified: Arc::new(AtomicBool::new(false)),
}
}
/// Push a `Debug` message.
pub fn debug(self, message: impl Into<String>) -> Self {
self.push(Level::Debug, message, None)
}
/// Push an `Info` message.
pub fn info(self, message: impl Into<String>) -> Self {
self.push(Level::Info, message, None)
}
/// Push a `Success` message.
pub fn success(self, message: impl Into<String>) -> Self {
self.push(Level::Success, message, None)
}
/// Push a `Warning` message.
pub fn warning(self, message: impl Into<String>) -> Self {
self.push(Level::Warning, message, None)
}
/// Push an `Error` message.
pub fn error(self, message: impl Into<String>) -> Self {
self.push(Level::Error, message, None)
}
/// Push a `Debug` message with metadata.
pub fn debug_with_metadata(self, message: impl Into<String>, metadata: Metadata) -> Self {
self.push(Level::Debug, message, Some(metadata))
}
/// Push an `Info` message with metadata.
pub fn info_with_metadata(self, message: impl Into<String>, metadata: Metadata) -> Self {
self.push(Level::Info, message, Some(metadata))
}
/// Push a `Success` message with metadata.
pub fn success_with_metadata(self, message: impl Into<String>, metadata: Metadata) -> Self {
self.push(Level::Success, message, Some(metadata))
}
/// Push a `Warning` message with metadata.
pub fn warning_with_metadata(self, message: impl Into<String>, metadata: Metadata) -> Self {
self.push(Level::Warning, message, Some(metadata))
}
/// Push an `Error` message with metadata.
pub fn error_with_metadata(self, message: impl Into<String>, metadata: Metadata) -> Self {
self.push(Level::Error, message, Some(metadata))
}
/// Push a message with the given level.
pub fn push(
self,
level: Level,
message: impl Into<String>,
metadata: Option<Metadata>,
) -> Self {
{
let mut data = self.data.lock();
data.pending_messages.push_back(Message {
message: message.into(),
level,
metadata,
});
}
if !self.is_modified() {
self.is_modified.store(true, atomic::Ordering::Release);
}
self
}
async fn save(self) -> Result<Self, session::Error> {
self.session
.insert(Self::DATA_KEY, self.data.clone())
.await?;
Ok(self)
}
fn load(self) -> Self {
{
// Load messages by taking them from the pending queue.
let mut data = self.data.lock();
data.messages = std::mem::take(&mut data.pending_messages);
}
self
}
fn is_modified(&self) -> bool {
self.is_modified.load(atomic::Ordering::Acquire)
}
}
impl Iterator for Messages {
type Item = Message;
fn next(&mut self) -> Option<Self::Item> {
let mut data = self.data.lock();
let message = data.messages.pop_front();
if message.is_some() && !self.is_modified() {
self.is_modified.store(true, atomic::Ordering::Release);
}
message
}
}
#[async_trait]
impl<S> FromRequestParts<S> for Messages
where
S: Send + Sync,
{
type Rejection = (StatusCode, &'static str);
async fn from_request_parts(parts: &mut Parts, _state: &S) -> Result<Self, Self::Rejection> {
parts
.extensions
.get::<Messages>()
.cloned()
.ok_or((
StatusCode::INTERNAL_SERVER_ERROR,
"Could not extract messages. Is `MessagesManagerLayer` installed?",
))
.map(Messages::load)
}
}
/// MIddleware provider `Messages` as a request extension.
#[derive(Debug, Clone)]
pub struct MessagesManager<S> {
inner: S,
}
impl<ReqBody, ResBody, S> Service<Request<ReqBody>> for MessagesManager<S>
where
S: Service<Request<ReqBody>, Response = Response<ResBody>> + Clone + Send + 'static,
S::Future: Send + 'static,
S::Error: Send,
ReqBody: Send + 'static,
ResBody: Default + Send,
{
type Response = S::Response;
type Error = S::Error;
type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
#[inline]
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.inner.poll_ready(cx)
}
fn call(&mut self, mut req: Request<ReqBody>) -> Self::Future {
// Because the inner service can panic until ready, we need to ensure we only
// use the ready service.
//
// See: https://docs.rs/tower/latest/tower/trait.Service.html#be-careful-when-cloning-inner-services
let clone = self.inner.clone();
let mut inner = std::mem::replace(&mut self.inner, clone);
Box::pin(async move {
let Some(session) = req.extensions().get::<Session>().cloned() else {
let mut res = Response::default();
*res.status_mut() = http::StatusCode::INTERNAL_SERVER_ERROR;
return Ok(res);
};
let data = match session.get::<Data>(Messages::DATA_KEY).await {
Ok(Some(data)) => data,
Ok(None) => Data::default(),
Err(_) => {
let mut res = Response::default();
*res.status_mut() = http::StatusCode::INTERNAL_SERVER_ERROR;
return Ok(res);
}
};
let messages = Messages::new(session, data);
req.extensions_mut().insert(messages.clone());
let res = inner.call(req).await;
if messages.is_modified() && messages.save().await.is_err() {
let mut res = Response::default();
*res.status_mut() = http::StatusCode::INTERNAL_SERVER_ERROR;
return Ok(res);
};
res
})
}
}
/// Layer for `MessagesManager`.
#[derive(Debug, Clone)]
pub struct MessagesManagerLayer;
impl<S> Layer<S> for MessagesManagerLayer {
type Service = MessagesManager<S>;
fn layer(&self, inner: S) -> Self::Service {
MessagesManager { inner }
}
}
#[cfg(test)]
mod tests {
use axum::{response::Redirect, routing::get, Router};
use axum_core::{body::Body, response::IntoResponse};
use http::header;
use http_body_util::BodyExt;
use tower::ServiceExt;
use tower_sessions::{MemoryStore, SessionManagerLayer};
use super::*;
#[tokio::test]
async fn basic() {
let session_store = MemoryStore::default();
let session_layer = SessionManagerLayer::new(session_store).with_secure(false);
let app = Router::new()
.route("/", get(root))
.route("/set-message", get(set_message))
.layer(MessagesManagerLayer)
.layer(session_layer);
async fn root(messages: Messages) -> impl IntoResponse {
messages
.into_iter()
.map(|message| format!("{}: {} {:?}", message.level, message, message.metadata))
.collect::<Vec<_>>()
.join(", ")
}
#[axum::debug_handler]
async fn set_message(messages: Messages) -> impl IntoResponse {
let mut metadata = Metadata::default();
metadata.insert("foo".to_string(), "bar".into());
messages
.debug_with_metadata("Hello, world!", metadata)
.info("This is an info message.");
Redirect::to("/")
}
let request = Request::builder()
.uri("/set-message")
.body(Body::empty())
.unwrap();
let mut response = app.clone().oneshot(request).await.unwrap();
assert!(response.status().is_redirection());
let cookie = response.headers_mut().remove(header::SET_COOKIE).unwrap();
let request = Request::builder()
.uri("/")
.header(header::COOKIE, cookie)
.body(Body::empty())
.unwrap();
let response = app.oneshot(request).await.unwrap();
let bytes = response.into_body().collect().await.unwrap().to_bytes();
let body = String::from_utf8(bytes.to_vec()).unwrap();
assert_eq!(
body,
"Debug: Hello, world! Some({\"foo\": String(\"bar\")}), Info: This is an info \
message. None"
);
}
}