pub struct Conn { /* private fields */ }
Expand description

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),
    Status::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. State access should generally be implemented by libraries using a private type and exposed with a ConnExt trait. See library patterns 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 so that application code can be written without transport generics. See Transport for further reading on this.

Implementations

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());

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(), Status::Ok);

assigns a status to this response. see Conn::status for example usage

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, Status::ImATeapot);
assert_eq!(status, 418);
assert!(!conn.is_halted());

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));

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));

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);

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());

Attempts to retrieve a &mut T from the state set

Puts a new type into the state set. see Conn::state for an example. returns the previous instance of this type, if any

Puts a new type into the state set and returns the Conn. this is useful for fluent chaining

Removes a type from the state set and returns it, if present

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

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.

See also: Conn::request_body_string for a convenience function when the content is expected to be utf8.

Examples
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");

Convenience function to read the content of a request body as a String.

Errors

This will return an error variant if either there is an IO failure on the underlying transport or if the body content is not a utf8 string.

Examples
use trillium_testing::prelude::*;
let mut conn = get("/").with_request_body("request body").on(&());

assert_eq!(conn.request_body_string().await.unwrap(), "request body");

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));

returns the request method for this conn.

use trillium_testing::prelude::*;
let mut conn = get("/").on(&());

assert_eq!(conn.method(), Method::Get);

returns the request headers

stability note: this may become request_headers at some point

returns the mutable response headers

stability note: this may become response_headers at some point

insert a header name and value/values into the response headers and return the conn. for a slight performance improvement, use a KnownHeaderName as the first argument instead of a str.

use trillium_testing::prelude::*;
let mut conn = get("/").on(&|conn: trillium::Conn| async move {
    conn.with_header("content-type", "application/html")
});

returns the path for this request. note that this may not represent the entire http request path if running nested routers.

returns query part of the request path

use trillium_testing::prelude::*;
let conn = get("/a/b?c&d=e").on(&());
assert_eq!(conn.querystring(), "c&d=e");

let conn = get("/a/b").on(&());
assert_eq!(conn.querystring(), "");

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());

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());

retrieves the halted state of this conn. see Conn::halt.

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.

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 interfaces that cannot be reached otherwise.

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 interfaces that cannot be reached otherwise.

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.

retrieves the remote ip address for this conn, if available.

sets the remote ip address for this conn.

for router implementations. pushes a route segment onto the path

for router implementations. removes a route segment onto the path

Trait Implementations

Converts this type into a mutable reference of the (usually inferred) input type.

Converts this type into a shared reference of the (usually inferred) input type.

Formats the value using the given formatter. Read more

Converts to this type from the input type.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.