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//! Definitions and helpers for sending and receiving messages between threads.
use crate::{
os_input_output::ServerOsApi, pty::PtyInstruction, pty_writer::PtyWriteInstruction,
screen::ScreenInstruction, wasm_vm::PluginInstruction, ServerInstruction,
};
use zellij_utils::{channels, channels::SenderWithContext, errors::ErrorContext};
/// A container for senders to the different threads in zellij on the server side
#[derive(Default, Clone)]
pub(crate) struct ThreadSenders {
pub to_screen: Option<SenderWithContext<ScreenInstruction>>,
pub to_pty: Option<SenderWithContext<PtyInstruction>>,
pub to_plugin: Option<SenderWithContext<PluginInstruction>>,
pub to_server: Option<SenderWithContext<ServerInstruction>>,
pub to_pty_writer: Option<SenderWithContext<PtyWriteInstruction>>,
// this is a convenience for the unit tests
// it's not advisable to set it to true in production code
pub should_silently_fail: bool,
}
impl ThreadSenders {
pub fn send_to_screen(
&self,
instruction: ScreenInstruction,
) -> Result<(), channels::SendError<(ScreenInstruction, ErrorContext)>> {
if self.should_silently_fail {
let _ = self
.to_screen
.as_ref()
.map(|sender| sender.send(instruction))
.unwrap_or_else(|| Ok(()));
Ok(())
} else {
self.to_screen.as_ref().unwrap().send(instruction)
}
}
pub fn send_to_pty(
&self,
instruction: PtyInstruction,
) -> Result<(), channels::SendError<(PtyInstruction, ErrorContext)>> {
if self.should_silently_fail {
let _ = self
.to_pty
.as_ref()
.map(|sender| sender.send(instruction))
.unwrap_or_else(|| Ok(()));
Ok(())
} else {
self.to_pty.as_ref().unwrap().send(instruction)
}
}
pub fn send_to_plugin(
&self,
instruction: PluginInstruction,
) -> Result<(), channels::SendError<(PluginInstruction, ErrorContext)>> {
if self.should_silently_fail {
let _ = self
.to_plugin
.as_ref()
.map(|sender| sender.send(instruction))
.unwrap_or_else(|| Ok(()));
Ok(())
} else {
self.to_plugin.as_ref().unwrap().send(instruction)
}
}
pub fn send_to_server(
&self,
instruction: ServerInstruction,
) -> Result<(), channels::SendError<(ServerInstruction, ErrorContext)>> {
if self.should_silently_fail {
let _ = self
.to_server
.as_ref()
.map(|sender| sender.send(instruction))
.unwrap_or_else(|| Ok(()));
Ok(())
} else {
self.to_server.as_ref().unwrap().send(instruction)
}
}
pub fn send_to_pty_writer(
&self,
instruction: PtyWriteInstruction,
) -> Result<(), channels::SendError<(PtyWriteInstruction, ErrorContext)>> {
if self.should_silently_fail {
let _ = self
.to_pty_writer
.as_ref()
.map(|sender| sender.send(instruction))
.unwrap_or_else(|| Ok(()));
Ok(())
} else {
self.to_pty_writer.as_ref().unwrap().send(instruction)
}
}
#[allow(unused)]
pub fn silently_fail_on_send(mut self) -> Self {
// this is mostly used for the tests, see struct
self.should_silently_fail = true;
self
}
}
/// A container for a receiver, OS input and the senders to a given thread
#[derive(Default)]
pub(crate) struct Bus<T> {
receivers: Vec<channels::Receiver<(T, ErrorContext)>>,
pub senders: ThreadSenders,
pub os_input: Option<Box<dyn ServerOsApi>>,
}
impl<T> Bus<T> {
pub fn new(
receivers: Vec<channels::Receiver<(T, ErrorContext)>>,
to_screen: Option<&SenderWithContext<ScreenInstruction>>,
to_pty: Option<&SenderWithContext<PtyInstruction>>,
to_plugin: Option<&SenderWithContext<PluginInstruction>>,
to_server: Option<&SenderWithContext<ServerInstruction>>,
to_pty_writer: Option<&SenderWithContext<PtyWriteInstruction>>,
os_input: Option<Box<dyn ServerOsApi>>,
) -> Self {
Bus {
receivers,
senders: ThreadSenders {
to_screen: to_screen.cloned(),
to_pty: to_pty.cloned(),
to_plugin: to_plugin.cloned(),
to_server: to_server.cloned(),
to_pty_writer: to_pty_writer.cloned(),
should_silently_fail: false,
},
os_input: os_input.clone(),
}
}
#[allow(unused)]
pub fn empty() -> Self {
// this is mostly used for the tests
Bus {
receivers: vec![],
senders: ThreadSenders {
to_screen: None,
to_pty: None,
to_plugin: None,
to_server: None,
to_pty_writer: None,
should_silently_fail: true,
},
os_input: None,
}
}
pub fn recv(&self) -> Result<(T, ErrorContext), channels::RecvError> {
let mut selector = channels::Select::new();
self.receivers.iter().for_each(|r| {
selector.recv(r);
});
let oper = selector.select();
let idx = oper.index();
oper.recv(&self.receivers[idx])
}
}
|
