fix: increase total limit in multipart example (#3567)

* fix: increase total limit in multipart example

* update readme

* Clarify where the limit comes from

* Fix link

---------

Co-authored-by: Yuki Okushi <huyuumi.dev@gmail.com>

actix-multipart/README.md

@@ -24,9 +24,10 @@ Due to additional requirements for `multipart/form-data` requests, the higher le
 ## Examples
 
 ```rust
-use actix_web::{post, App, HttpServer, Responder};
-
-use actix_multipart::form::{json::Json as MpJson, tempfile::TempFile, MultipartForm};
+use actix_multipart::form::{
+    json::Json as MpJson, tempfile::TempFile, MultipartForm, MultipartFormConfig,
+};
+use actix_web::{middleware::Logger, post, App, HttpServer, Responder};
 use serde::Deserialize;
 
 #[derive(Debug, Deserialize)]
@@ -36,25 +37,37 @@ struct Metadata {
 
 #[derive(Debug, MultipartForm)]
 struct UploadForm {
+    // Note: the form is also subject to the global limits configured using `MultipartFormConfig`.
     #[multipart(limit = "100MB")]
     file: TempFile,
     json: MpJson<Metadata>,
 }
 
 #[post("/videos")]
-pub async fn post_video(MultipartForm(form): MultipartForm<UploadForm>) -> impl Responder {
+async fn post_video(MultipartForm(form): MultipartForm<UploadForm>) -> impl Responder {
     format!(
-        "Uploaded file {}, with size: {}",
-        form.json.name, form.file.size
+        "Uploaded file {}, with size: {}\ntemporary file ({}) was deleted\n",
+        form.json.name,
+        form.file.size,
+        form.file.file.path().display(),
     )
 }
 
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
-    HttpServer::new(move || App::new().service(post_video))
-        .bind(("127.0.0.1", 8080))?
-        .run()
-        .await
+    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
+
+    HttpServer::new(move || {
+        App::new()
+            .service(post_video)
+            .wrap(Logger::default())
+            // Also increase the global total limit to 100MiB.
+            .app_data(MultipartFormConfig::default().total_limit(100 * 1024 * 1024))
+    })
+    .workers(2)
+    .bind(("127.0.0.1", 8080))?
+    .run()
+    .await
 }
 ```
 

actix-multipart/examples/form.rs

@@ -1,4 +1,6 @@
-use actix_multipart::form::{json::Json as MpJson, tempfile::TempFile, MultipartForm};
+use actix_multipart::form::{
+    json::Json as MpJson, tempfile::TempFile, MultipartForm, MultipartFormConfig,
+};
 use actix_web::{middleware::Logger, post, App, HttpServer, Responder};
 use serde::Deserialize;
 
@@ -9,6 +11,7 @@ struct Metadata {
 
 #[derive(Debug, MultipartForm)]
 struct UploadForm {
+    // Note: the form is also subject to the global limits configured using `MultipartFormConfig`.
     #[multipart(limit = "100MB")]
     file: TempFile,
     json: MpJson<Metadata>,
@@ -28,9 +31,15 @@ async fn post_video(MultipartForm(form): MultipartForm<UploadForm>) -> impl Resp
 async fn main() -> std::io::Result<()> {
     env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
 
-    HttpServer::new(move || App::new().service(post_video).wrap(Logger::default()))
-        .workers(2)
-        .bind(("127.0.0.1", 8080))?
-        .run()
-        .await
+    HttpServer::new(move || {
+        App::new()
+            .service(post_video)
+            .wrap(Logger::default())
+            // Also increase the global total limit to 100MiB.
+            .app_data(MultipartFormConfig::default().total_limit(100 * 1024 * 1024))
+    })
+    .workers(2)
+    .bind(("127.0.0.1", 8080))?
+    .run()
+    .await
 }

actix-multipart/src/lib.rs

@@ -13,7 +13,7 @@
 //! ```no_run
 //! use actix_web::{post, App, HttpServer, Responder};
 //!
-//! use actix_multipart::form::{json::Json as MpJson, tempfile::TempFile, MultipartForm};
+//! use actix_multipart::form::{json::Json as MpJson, tempfile::TempFile, MultipartForm, MultipartFormConfig};
 //! use serde::Deserialize;
 //!
 //! #[derive(Debug, Deserialize)]
@@ -23,6 +23,7 @@
 //!
 //! #[derive(Debug, MultipartForm)]
 //! struct UploadForm {
+//!     // Note: the form is also subject to the global limits configured using `MultipartFormConfig`.
 //!     #[multipart(limit = "100MB")]
 //!     file: TempFile,
 //!     json: MpJson<Metadata>,
@@ -38,10 +39,15 @@
 //!
 //! #[actix_web::main]
 //! async fn main() -> std::io::Result<()> {
-//!     HttpServer::new(move || App::new().service(post_video))
-//!         .bind(("127.0.0.1", 8080))?
-//!         .run()
-//!         .await
+//!     HttpServer::new(move || {
+//!         App::new()
+//!             .service(post_video)
+//!             // Also increase the global total limit to 100MiB.
+//!             .app_data(MultipartFormConfig::default().total_limit(100 * 1024 * 1024))
+//!     })
+//!     .bind(("127.0.0.1", 8080))?
+//!     .run()
+//!     .await
 //! }
 //! ```
 //!