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use crate::http_types::{ headers::{Header, Headers}, Body, Method, StatusCode, }; use std::convert::TryInto; use std::fmt::{self, Debug, Formatter}; use trillium_http::{ transport::{BoxedTransport, Transport}, ReceivedBody, }; /** # A Trillium HTTP connection. A Conn represents both the request and response of a http connection, as well as any application state that is associated with that connection. ## `with_{attribute}` naming convention A convention that is used throughout trillium is that any interface that is named `with_{attribute}` will take ownership of the conn, set the attribute and return the conn, enabling chained calls like: ``` struct MyState(&'static str); async fn handler(mut conn: trillium::Conn) -> trillium::Conn { conn.with_header(("content-type", "text/plain")) .with_state(MyState("hello")) .with_body("hey there") .with_status(418) } use trillium_testing::prelude::*; assert_response!( get("/").on(&handler), StatusCode::ImATeapot, "hey there", "content-type" => "text/plain" ); ``` If you need to set a property on the conn without moving it, `set_{attribute}` associated functions will be your huckleberry, as is conventional in other rust projects. ## State Every trillium Conn contains a state type which is a set that contains at most one element for each type. State is the primary way that handlers attach data to a conn as it passes through a tuple handler. In general, state access should generally be implemented by libraries using a private type and exposed with a ConnExt trait. See [library patterns](https://trillium.rs/library_patterns.html#state) for more elaboration and examples. ## In relation to [`trillium_http::Conn`] `trillium::Conn` is currently implemented as an abstraction on top of a [`trillium_http::Conn`]. In particular, `trillium::Conn` boxes the transport using a [`BoxedTransport`](trillium_http::transport::BoxedTransport) so that application code can be written without transport generics. See [`Transport`](trillium_http::transport::Transport) for further reading on this. */ pub struct Conn { inner: trillium_http::Conn<BoxedTransport>, halted: bool, path: Vec<String>, } impl Debug for Conn { fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result { f.debug_struct("Conn") .field("inner", &self.inner) .field("halted", &self.halted) .field("path", &self.path) .finish() } } impl<T: Transport + 'static> From<trillium_http::Conn<T>> for Conn { fn from(inner: trillium_http::Conn<T>) -> Self { Self { inner: inner.map_transport(BoxedTransport::new), halted: false, path: vec![], } } } impl Conn { /** Conn::ok is a convenience function for the common pattern of setting a body and a 200 status in one call. It is exactly identical to `conn.with_status(200).with_body(body).halt()` ``` use trillium::Conn; use trillium_testing::prelude::*; let mut conn = get("/").on(&|conn: Conn| async move { conn.ok("hello") }); assert_body!(&mut conn, "hello"); assert_status!(&conn, 200); assert!(conn.is_halted()); ``` */ pub fn ok(self, body: impl Into<Body>) -> Conn { self.with_status(200).with_body(body).halt() } /** returns the response status for this conn, if it has been set. ``` use trillium_testing::prelude::*; let mut conn = get("/").on(&()); assert!(conn.status().is_none()); conn.set_status(200); assert_eq!(conn.status().unwrap(), StatusCode::Ok); ``` */ pub fn status(&self) -> Option<StatusCode> { self.inner.status() } /// assigns a status to this response. see [`Conn::status`] for example usage pub fn set_status(&mut self, status: impl TryInto<StatusCode>) { self.inner.set_status(status); } /** sets the response status for this conn and returns it. note that this does not set the halted status. ``` use trillium_testing::prelude::*; let conn = get("/").on(&|conn: Conn| async move { conn.with_status(418) }); let status = conn.status().unwrap(); assert_eq!(status, StatusCode::ImATeapot); assert_eq!(status, 418); assert!(!conn.is_halted()); ``` */ pub fn with_status(mut self, status: impl TryInto<StatusCode>) -> Self { self.set_status(status); self } /** Sets the response body from any `impl Into<Body>` and returns the conn for fluent chaining. Note that this does not set the response status or halted. See [`Conn::ok`] for a function that does both of those. ``` use trillium_testing::prelude::*; let conn = get("/").on(&|conn: Conn| async move { conn.with_body("hello") }); assert_eq!(conn.response_len(), Some(5)); ``` */ pub fn with_body(mut self, body: impl Into<Body>) -> Self { self.set_body(body); self } /** Sets the response body from any `impl Into<Body>`. Note that this does not set the response status or halted. ``` use trillium_testing::prelude::*; let mut conn = get("/").on(&()); conn.set_body("hello"); assert_eq!(conn.response_len(), Some(5)); ``` */ pub fn set_body(&mut self, body: impl Into<Body>) { self.inner.set_response_body(body); } /** Removes the response body from the conn ``` use trillium_testing::prelude::*; let mut conn = get("/").on(&()); conn.set_body("hello"); let mut body = conn.take_response_body().unwrap(); assert_eq!(body.len(), Some(5)); assert_eq!(conn.response_len(), None); ``` */ pub fn take_response_body(&mut self) -> Option<Body> { self.inner.take_response_body() } /** Attempts to retrieve a &T from the state set ``` use trillium_testing::prelude::*; struct Hello; let mut conn = get("/").on(&()); assert!(conn.state::<Hello>().is_none()); conn.set_state(Hello); assert!(conn.state::<Hello>().is_some()); ``` */ pub fn state<T: 'static>(&self) -> Option<&T> { self.inner.state().get() } /// Attempts to retrieve a &mut T from the state set pub fn state_mut<T: 'static>(&mut self) -> Option<&mut T> { self.inner.state_mut().get_mut() } /// Puts a new type into the state set. see [`Conn::state`] /// for an example. returns the previous instance of this type, if /// any pub fn set_state<T: Send + Sync + 'static>(&mut self, val: T) -> Option<T> { self.inner.state_mut().insert(val) } /// Puts a new type into the state set and returns the /// conn. this is useful for fluent chaining pub fn with_state<T: Send + Sync + 'static>(mut self, val: T) -> Self { self.set_state(val); self } /// Removes a type from the state set and returns it, if present pub fn take_state<T: Send + Sync + 'static>(&mut self) -> Option<T> { self.inner.state_mut().remove() } /** Either returns the current &mut T from the state set, or inserts a new one with the provided default function and returns a mutable reference to it */ pub fn mut_state_or_insert_with<T, F>(&mut self, default: F) -> &mut T where T: Send + Sync + 'static, F: FnOnce() -> T, { self.inner.state_mut().get_or_insert_with(default) } /** returns a [ReceivedBody] that references this conn. the conn retains all data and holds the singular transport, but the ReceivedBody provides an interface to read body content ``` # trillium_testing::block_on(async { use trillium_testing::prelude::*; let mut conn = get("/").with_request_body("request body").on(&()); let request_body = conn.request_body().await; assert_eq!(request_body.content_length(), Some(12)); assert_eq!(request_body.read_string().await.unwrap(), "request body"); # }); ``` */ pub async fn request_body(&mut self) -> ReceivedBody<'_, BoxedTransport> { self.inner.request_body().await } /** Convenience function to read the content of a request body as a String. ``` # trillium_testing::block_on(async { use trillium_testing::prelude::*; let mut conn = get("/").with_request_body("request body").on(&()); assert_eq!(conn.request_body_string().await.unwrap(), "request body"); # }); ``` */ pub async fn request_body_string(&mut self) -> trillium_http::Result<String> { self.request_body().await.read_string().await } /** if there is a response body for this conn and it has a known fixed length, it is returned from this function ``` use trillium_testing::prelude::*; let mut conn = get("/").on(&|conn: trillium::Conn| async move { conn.with_body("hello") }); assert_eq!(conn.response_len(), Some(5)); ``` */ pub fn response_len(&self) -> Option<u64> { self.inner.response_body().and_then(|b| b.len()) } /** returns the request method for this conn. ``` use trillium_testing::prelude::*; let mut conn = get("/").on(&()); assert_eq!(conn.method(), Method::Get); ``` */ pub fn method(&self) -> Method { self.inner.method() } /// returns the request headers /// /// stability note: this may become `request_headers` at some point pub fn headers(&self) -> &Headers { self.inner.request_headers() } /// returns the mutable response headers /// /// stability note: this may become `response_headers` at some point pub fn headers_mut(&mut self) -> &mut Headers { self.inner.response_headers() } /** apply a [`Header`] to the response headers and return the conn stability note: If trillium drops the dependence on http-types, this likely willl become `conn.with_header(&str, &str)` ``` use trillium_testing::prelude::*; let mut conn = get("/").on(&|conn: trillium::Conn| async move { conn.with_header(("content-type", "application/html")) }); ``` */ pub fn with_header(mut self, header: impl Header) -> Self { self.headers_mut().apply(header); self } /// returns the path for this request. note that this may not /// represent the entire http request path if running nested /// routers. pub fn path(&self) -> &str { self.path .last() .map(|p| &**p) .unwrap_or_else(|| self.inner.path()) } /** sets the `halted` attribute of this conn, preventing later processing in a given tuple handler. returns the conn for fluent chaining ``` use trillium_testing::prelude::*; let mut conn = get("/").on(&|conn: trillium::Conn| async move { conn.halt() }); assert!(conn.is_halted()); ``` */ pub fn halt(mut self) -> Self { self.set_halted(true); self } /** sets the `halted` attribute of this conn. see [`Conn::halt`]. ``` use trillium_testing::prelude::*; let mut conn = get("/").on(&()); assert!(!conn.is_halted()); conn.set_halted(true); assert!(conn.is_halted()); ``` */ pub fn set_halted(&mut self, halted: bool) { self.halted = halted; } /// retrieves the halted state of this conn. see [`Conn::halt`]. pub fn is_halted(&self) -> bool { self.halted } /// predicate function to indicate whether the connection is /// secure. note that this does not necessarily indicate that the /// transport itself is secure, as it may indicate that /// trillium_http is behind a trusted reverse proxy that has /// terminated tls and provided appropriate headers to indicate /// this. pub fn is_secure(&self) -> bool { self.inner.is_secure() } /// returns an immutable reference to the inner /// [`trillium_http::Conn`]. please open an issue if you need to do /// this in application code. /// /// stability note: hopefully this can go away at some point, /// but for now is an escape hatch in case trillium_http::Conn /// presents interface that cannot be reached otherwise. pub fn inner(&self) -> &trillium_http::Conn<BoxedTransport> { &self.inner } /// returns a mutable reference to the inner /// [`trillium_http::Conn`]. please open an issue if you need to /// do this in application code. /// /// stability note: hopefully this can go away at some point, /// but for now is an escape hatch in case trillium_http::Conn /// presents interface that cannot be reached otherwise. pub fn inner_mut(&mut self) -> &mut trillium_http::Conn<BoxedTransport> { &mut self.inner } /// transforms this trillium::Conn into a `trillium_http::Conn` /// with the specified transport type. Please note that this will /// panic if you attempt to downcast from trillium's boxed /// transport into the wrong transport type. Also note that this /// is a lossy conversion, dropping the halted state and any /// nested router path data. pub fn into_inner<T: Transport>(self) -> trillium_http::Conn<T> { self.inner.map_transport(|t| { *t.downcast() .expect("attempted to downcast to the wrong transport type") }) } /// for router implementations. pushes a route segment onto the path pub fn push_path(&mut self, path: String) { self.path.push(path); } /// for router implementations. removes a route segment onto the path pub fn pop_path(&mut self) { self.path.pop(); } }