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use std::rc::Rc;
use crate::{
shell::{BinaryMessengerReply, Context, EngineHandle, EngineManager},
Error, Result,
};
use super::{MethodCall, MethodCallError, MethodCallResult, MethodCodec};
pub struct MethodChannel<V>
where
V: 'static,
{
context: Rc<Context>,
invoker: MethodInvoker<V>,
}
impl<V> MethodChannel<V> {
pub fn new<F>(
context: Rc<Context>,
engine_handle: EngineHandle,
channel_name: &str,
codec: &'static dyn MethodCodec<V>,
callback: F,
) -> Self
where
F: Fn(MethodCall<V>, MethodCallReply<V>) + 'static,
{
Self::new_with_engine_manager(
context.clone(),
engine_handle,
channel_name,
codec,
callback,
&context.engine_manager.borrow(),
)
}
pub fn new_with_engine_manager<F>(
context: Rc<Context>,
engine_handle: EngineHandle,
channel_name: &str,
codec: &'static dyn MethodCodec<V>,
callback: F,
engine_manager: &EngineManager,
) -> Self
where
F: Fn(MethodCall<V>, MethodCallReply<V>) + 'static,
{
let res = MethodChannel {
context: context.clone(),
invoker: MethodInvoker {
context,
engine_handle,
channel_name: channel_name.into(),
codec,
},
};
let engine = engine_manager.get_engine(engine_handle);
if let Some(engine) = engine {
let codec = codec;
engine
.binary_messenger()
.register_channel_handler(channel_name, move |data, reply| {
let message = codec.decode_method_call(data).unwrap();
let reply = MethodCallReply { reply, codec };
callback(message, reply);
});
}
res
}
pub fn invoker(&self) -> &MethodInvoker<V> {
&self.invoker
}
}
#[derive(Clone)]
pub struct MethodInvoker<V>
where
V: 'static,
{
context: Rc<Context>,
engine_handle: EngineHandle,
channel_name: String,
codec: &'static dyn MethodCodec<V>,
}
impl<V> MethodInvoker<V> {
pub fn call_method<F>(&self, method: String, args: V, reply: F) -> Result<()>
where
F: FnOnce(MethodCallResult<V>) + 'static,
{
let encoded = self.codec.encode_method_call(&MethodCall { method, args });
let engine_manager = self.context.engine_manager.borrow();
let engine = engine_manager.get_engine(self.engine_handle);
if let Some(engine) = engine {
let codec = self.codec;
engine
.binary_messenger()
.send_message(&self.channel_name, &encoded, move |message| {
let message = codec.decode_envelope(message).unwrap();
reply(message);
})
} else {
Err(Error::InvalidEngineHandle)
}
}
}
pub struct MethodCallReply<V>
where
V: 'static,
{
reply: BinaryMessengerReply,
codec: &'static dyn MethodCodec<V>,
}
impl<V> MethodCallReply<V> {
pub fn send(self, value: MethodCallResult<V>) {
let encoded = self.codec.encode_method_call_result(&value);
self.reply.send(&encoded);
}
pub fn send_ok(self, value: V) {
self.send(MethodCallResult::Ok(value))
}
pub fn send_error(self, code: &str, message: Option<&str>, details: V) {
self.send(MethodCallResult::Err(MethodCallError {
code: code.into(),
message: message.map(|m| m.into()),
details,
}));
}
}
impl<V> Drop for MethodChannel<V> {
fn drop(&mut self) {
let engine_manager = self.context.engine_manager.borrow();
let engine = engine_manager.get_engine(self.invoker.engine_handle);
if let Some(engine) = engine {
engine
.binary_messenger()
.unregister_channel_handler(&self.invoker.channel_name);
}
}
}