Struct axum::response::sse::Event

pub struct Event { /* private fields */ }

Available on crate feature tokio only.

Server-sent event

Implementations

impl Event

pub fn data<T>(self, data: T) -> Event

where T: AsRef<str>,

Set the event’s data data field(s) (data: <content>)

Newlines in data will automatically be broken across data: fields.

This corresponds to MessageEvent’s data field.

Note that events with an empty data field will be ignored by the browser.

Panics

• Panics if data contains any carriage returns, as they cannot be transmitted over SSE.
• Panics if data or json_data have already been called.

pub fn json_data<T>(self, data: T) -> Result<Event, Error>

where T: Serialize,

Available on crate feature json only.

Set the event’s data field to a value serialized as unformatted JSON (data: <content>).

This corresponds to MessageEvent’s data field.

Panics

Panics if data or json_data have already been called.

pub fn comment<T>(self, comment: T) -> Event

where T: AsRef<str>,

Set the event’s comment field (:<comment-text>).

This field will be ignored by most SSE clients.

Unlike other functions, this function can be called multiple times to add many comments.

Panics

Panics if comment contains any newlines or carriage returns, as they are not allowed in comments.

pub fn event<T>(self, event: T) -> Event

where T: AsRef<str>,

Set the event’s name field (event:<event-name>).

This corresponds to the type parameter given when calling addEventListener on an EventSource. For example, .event("update") should correspond to .addEventListener("update", ...). If no event type is given, browsers will fire a message event instead.

Panics

• Panics if event contains any newlines or carriage returns.
• Panics if this function has already been called on this event.

pub fn retry(self, duration: Duration) -> Event

Set the event’s retry timeout field (retry:<timeout>).

This sets how long clients will wait before reconnecting if they are disconnected from the SSE endpoint. Note that this is just a hint: clients are free to wait for longer if they wish, such as if they implement exponential backoff.

Panics

Panics if this function has already been called on this event.

pub fn id<T>(self, id: T) -> Event

where T: AsRef<str>,

Set the event’s identifier field (id:<identifier>).

This corresponds to MessageEvent’s lastEventId field. If no ID is in the event itself, the browser will set that field to the last known message ID, starting with the empty string.

Panics

• Panics if id contains any newlines, carriage returns or null characters.
• Panics if this function has already been called on this event.

Trait Implementations

impl Clone for Event

fn clone(&self) -> Event

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Event

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Event

fn default() -> Event

Returns the “default value” for a type.