Struct ServiceWorker

pub struct ServiceWorker { /* private fields */ }

Connects Rust Handler with browser service worker via WASI filesystem.

ServiceWorker is a singleton which holds input and output file handles and owns woker via Handler trait. Worker is supposedly reactive, usually operating on incoming events (on_message) and posting messages to main browser application via ServiceWorker::post_message().

Note: ServiceWorker supposed to operate in single threaded environment like a browser service worker.

TODO: it requires cleaning of filesystem, add drop implementation

Implementations

impl ServiceWorker

pub fn initialize(options: ServiceOptions) -> Result<()>

Initialize ServiceWorker instance. ServiceWorker operates as singleton, all struct methods are static. Unless initialized all methods will result in error io::ErrorKind::NotConnected.

pub fn set_message_handler(new_handler: Box<dyn Handler>)

Message handler is required to process incoming messages. Please note, there is no queue therefore messages received before handler initialized will be lost.

pub fn on_message() -> Result<usize>

This method is a trigger This is workaround while we don’t have wasi::poll_oneoff, ideally we shall just poll and wait for FD_READ event.

pub fn post_message(msg: &[u8]) -> Result<()>

Post message to external consumers

Example usage:

use wasi_worker::ServiceWorker;
ServiceWorker::post_message(b"mymesage");

pub fn kill()

Trait Implementations

impl Drop for ServiceWorker

fn drop(&mut self)

Executes the destructor for this type.