mirror of
https://github.com/actix/examples
synced 2024-12-18 16:23:12 +01:00
98 lines
3.1 KiB
Rust
98 lines
3.1 KiB
Rust
use std::collections::HashMap;
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use actix_web::{
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body::BoxBody,
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dev::ServiceResponse,
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error,
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http::{header::ContentType, StatusCode},
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middleware::{self, ErrorHandlerResponse, ErrorHandlers},
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web, App, Error, HttpResponse, HttpServer, Responder, Result,
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};
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use actix_web_lab::respond::Html;
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use tera::Tera;
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// store tera template in application state
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async fn index(
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tmpl: web::Data<tera::Tera>,
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query: web::Query<HashMap<String, String>>,
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) -> Result<impl Responder, Error> {
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let s = if let Some(name) = query.get("name") {
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// submitted form
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let mut ctx = tera::Context::new();
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ctx.insert("name", name);
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ctx.insert("text", "Welcome!");
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tmpl.render("user.html", &ctx)
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.map_err(|_| error::ErrorInternalServerError("Template error"))?
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} else {
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tmpl.render("index.html", &tera::Context::new())
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.map_err(|_| error::ErrorInternalServerError("Template error"))?
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};
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Ok(Html(s))
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}
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#[actix_web::main]
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async fn main() -> std::io::Result<()> {
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env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
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log::info!("starting HTTP server at http://localhost:8080");
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HttpServer::new(|| {
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let tera = Tera::new(concat!(env!("CARGO_MANIFEST_DIR"), "/templates/**/*")).unwrap();
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App::new()
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.app_data(web::Data::new(tera))
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.wrap(middleware::Logger::default())
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.service(web::resource("/").route(web::get().to(index)))
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.service(web::scope("").wrap(error_handlers()))
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})
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.bind(("127.0.0.1", 8080))?
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.run()
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.await
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}
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// Custom error handlers, to return HTML responses when an error occurs.
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fn error_handlers() -> ErrorHandlers<BoxBody> {
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ErrorHandlers::new().handler(StatusCode::NOT_FOUND, not_found)
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}
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// Error handler for a 404 Page not found error.
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fn not_found<B>(res: ServiceResponse<B>) -> Result<ErrorHandlerResponse<BoxBody>> {
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let response = get_error_response(&res, "Page not found");
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Ok(ErrorHandlerResponse::Response(ServiceResponse::new(
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res.into_parts().0,
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response.map_into_left_body(),
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)))
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}
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// Generic error handler.
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fn get_error_response<B>(res: &ServiceResponse<B>, error: &str) -> HttpResponse {
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let request = res.request();
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// Provide a fallback to a simple plain text response in case an error occurs during the
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// rendering of the error page.
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let fallback = |e: &str| {
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HttpResponse::build(res.status())
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.content_type(ContentType::plaintext())
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.body(e.to_string())
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};
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let tera = request.app_data::<web::Data<Tera>>().map(|t| t.get_ref());
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match tera {
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Some(tera) => {
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let mut context = tera::Context::new();
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context.insert("error", error);
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context.insert("status_code", res.status().as_str());
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let body = tera.render("error.html", &context);
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match body {
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Ok(body) => HttpResponse::build(res.status())
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.content_type(ContentType::html())
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.body(body),
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Err(_) => fallback(error),
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}
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}
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None => fallback(error),
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}
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}
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