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Flatten protobuf message namespace

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* Remove `FromClient`/`FromServer` distinction.
* Remove `subscribe` concept - clients will need to handle
  unprompted messages from the server.

Co-Authored-By: Nathan Sobo <nathan@zed.dev>
This commit is contained in:
Max Brunsfeld 2021-06-15 13:06:50 -07:00
parent 546ce14cb9
commit e88f33851e
5 changed files with 174 additions and 328 deletions
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137
zed-rpc/proto/zed.proto
View file

@ -1,65 +1,82 @@
syntax = "proto3";
package zed.messages;
message FromClient {
int32 id = 1;
oneof variant {
Auth auth = 2;
NewWorktree new_worktree = 3;
ShareWorktree share_worktree = 4;
UploadFile upload_file = 5;
SubscribeToPathRequests subscribe_to_path_requests = 6;
}
message Auth {
int32 user_id = 1;
string access_token = 2;
}
message NewWorktree {}
message ShareWorktree {
uint64 worktree_id = 1;
repeated PathAndDigest files = 2;
}
message PathAndDigest {
bytes path = 1;
bytes digest = 2;
}
message UploadFile {
bytes path = 1;
bytes content = 2;
}
message SubscribeToPathRequests {}
}
message FromServer {
optional int32 request_id = 1;
oneof variant {
AuthResponse auth_response = 2;
NewWorktreeResponse new_worktree_response = 3;
ShareWorktreeResponse share_worktree_response = 4;
PathRequest path_request = 5;
}
message AuthResponse {
bool credentials_valid = 1;
}
message NewWorktreeResponse {
uint64 worktree_id = 1;
}
message ShareWorktreeResponse {
repeated int32 needed_file_indices = 1;
}
message PathRequest {
bytes path = 1;
message Envelope {
uint32 id = 1;
optional uint32 responding_to = 2;
oneof payload {
Auth auth = 3;
AuthResponse auth_response = 4;
ShareWorktree share_worktree = 5;
ShareWorktreeResponse share_worktree_response = 6;
OpenWorktree open_worktree = 7;
OpenWorktreeResponse open_worktree_response = 8;
OpenBuffer open_buffer = 9;
OpenBufferResponse open_buffer_response = 10;
}
}
message Auth {
uint64 user_id = 1;
string access_token = 2;
}
message AuthResponse {
bool credentials_valid = 1;
}
message ShareWorktree {
Worktree worktree = 1;
}
message ShareWorktreeResponse {
uint64 worktree_id = 1;
string access_token = 2;
}
message OpenWorktree {
uint64 worktree_id = 1;
string access_token = 2;
}
message OpenWorktreeResponse {
Worktree worktree = 1;
}
message OpenBuffer {
uint64 worktree_id = 1;
bytes path = 2;
}
message OpenBufferResponse {
Buffer buffer = 1;
}
message Worktree {
repeated bytes paths = 1;
}
message Buffer {
uint64 id = 1;
bytes path = 2;
bytes content = 3;
repeated Operation history = 4;
}
message Operation {
oneof variant {
Edit edit = 1;
}
message Edit {
uint32 replica_id = 1;
uint32 local_timestamp = 2;
uint32 lamport_timestamp = 3;
repeated VectorClockEntry version = 4;
}
message VectorClockEntry {
uint32 replica_id = 1;
uint32 timestamp = 2;
}
}

116
zed-rpc/src/proto.rs
View file

@ -5,42 +5,28 @@ use std::{convert::TryInto, io};
include!(concat!(env!("OUT_DIR"), "/zed.messages.rs"));
/// A message that the client can send to the server.
pub trait ClientMessage: Sized {
fn to_variant(self) -> from_client::Variant;
fn from_variant(variant: from_client::Variant) -> Option<Self>;
pub trait EnvelopedMessage: Sized {
fn into_envelope(self, id: u32, responding_to: Option<u32>) -> Envelope;
fn from_envelope(envelope: Envelope) -> Option<Self>;
}
/// A message that the server can send to the client.
pub trait ServerMessage: Sized {
fn to_variant(self) -> from_server::Variant;
fn from_variant(variant: from_server::Variant) -> Option<Self>;
pub trait RequestMessage: EnvelopedMessage {
type Response: EnvelopedMessage;
}
/// A message that the client can send to the server, where the server must respond with a single
/// message of a certain type.
pub trait RequestMessage: ClientMessage {
type Response: ServerMessage;
}
/// A message that the client can send to the server, where the server must respond with a series of
/// messages of a certain type.
pub trait SubscribeMessage: ClientMessage {
type Event: ServerMessage;
}
/// A message that the client can send to the server, where the server will not respond.
pub trait SendMessage: ClientMessage {}
macro_rules! directed_message {
($name:ident, $direction_trait:ident, $direction_module:ident) => {
impl $direction_trait for $direction_module::$name {
fn to_variant(self) -> $direction_module::Variant {
$direction_module::Variant::$name(self)
macro_rules! message {
($name:ident) => {
impl EnvelopedMessage for $name {
fn into_envelope(self, id: u32, responding_to: Option<u32>) -> Envelope {
Envelope {
id,
responding_to,
payload: Some(envelope::Payload::$name(self)),
}
}
fn from_variant(variant: $direction_module::Variant) -> Option<Self> {
if let $direction_module::Variant::$name(msg) = variant {
fn from_envelope(envelope: Envelope) -> Option<Self> {
if let Some(envelope::Payload::$name(msg)) = envelope.payload {
Some(msg)
} else {
None
@ -52,36 +38,18 @@ macro_rules! directed_message {
macro_rules! request_message {
($req:ident, $resp:ident) => {
directed_message!($req, ClientMessage, from_client);
directed_message!($resp, ServerMessage, from_server);
impl RequestMessage for from_client::$req {
type Response = from_server::$resp;
}
};
}
macro_rules! send_message {
($msg:ident) => {
directed_message!($msg, ClientMessage, from_client);
impl SendMessage for from_client::$msg {}
};
}
macro_rules! subscribe_message {
($subscription:ident, $event:ident) => {
directed_message!($subscription, ClientMessage, from_client);
directed_message!($event, ServerMessage, from_server);
impl SubscribeMessage for from_client::$subscription {
type Event = from_server::$event;
message!($req);
message!($resp);
impl RequestMessage for $req {
type Response = $resp;
}
};
}
request_message!(Auth, AuthResponse);
request_message!(NewWorktree, NewWorktreeResponse);
request_message!(ShareWorktree, ShareWorktreeResponse);
send_message!(UploadFile);
subscribe_message!(SubscribeToPathRequests, PathRequest);
request_message!(OpenWorktree, OpenWorktreeResponse);
request_message!(OpenBuffer, OpenBufferResponse);
/// A stream of protobuf messages.
pub struct MessageStream<T> {
@ -107,7 +75,7 @@ where
T: AsyncWrite + Unpin,
{
/// Write a given protobuf message to the stream.
pub async fn write_message(&mut self, message: &impl Message) -> io::Result<()> {
pub async fn write_message(&mut self, message: &Envelope) -> io::Result<()> {
let message_len: u32 = message
.encoded_len()
.try_into()
@ -124,13 +92,13 @@ where
T: AsyncRead + Unpin,
{
/// Read a protobuf message of the given type from the stream.
pub async fn read_message<M: Message + Default>(&mut self) -> futures_io::Result<M> {
pub async fn read_message(&mut self) -> futures_io::Result<Envelope> {
let mut delimiter_buf = [0; 4];
self.byte_stream.read_exact(&mut delimiter_buf).await?;
let message_len = u32::from_be_bytes(delimiter_buf) as usize;
self.buffer.resize(message_len, 0);
self.byte_stream.read_exact(&mut self.buffer).await?;
Ok(M::decode(self.buffer.as_slice())?)
Ok(Envelope::decode(self.buffer.as_slice())?)
}
}
@ -151,30 +119,24 @@ mod tests {
chunk_size: 3,
};
let message1 = FromClient {
id: 3,
variant: Some(from_client::Variant::Auth(from_client::Auth {
user_id: 5,
access_token: "the-access-token".into(),
})),
};
let message2 = FromClient {
id: 4,
variant: Some(from_client::Variant::UploadFile(from_client::UploadFile {
path: Vec::new(),
content: format!(
"a {}long error message that requires a two-byte length delimiter",
"very ".repeat(60)
)
.into(),
})),
};
let message1 = Auth {
user_id: 5,
access_token: "the-access-token".into(),
}
.into_envelope(3, None);
let message2 = ShareWorktree {
worktree: Some(Worktree {
paths: vec![b"ok".to_vec()],
}),
}
.into_envelope(5, None);
let mut message_stream = MessageStream::new(byte_stream);
message_stream.write_message(&message1).await.unwrap();
message_stream.write_message(&message2).await.unwrap();
let decoded_message1 = message_stream.read_message::<FromClient>().await.unwrap();
let decoded_message2 = message_stream.read_message::<FromClient>().await.unwrap();
let decoded_message1 = message_stream.read_message().await.unwrap();
let decoded_message2 = message_stream.read_message().await.unwrap();
assert_eq!(decoded_message1, message1);
assert_eq!(decoded_message2, message2);
});

231
zed/src/rpc_client.rs
View file

@ -2,7 +2,7 @@ use anyhow::{anyhow, Result};
use futures::future::Either;
use gpui::executor::Background;
use postage::{
barrier, mpsc,
barrier, oneshot,
prelude::{Sink, Stream},
};
use smol::{
@ -14,18 +14,16 @@ use std::{
collections::HashMap,
future::Future,
sync::{
atomic::{self, AtomicI32},
atomic::{self, AtomicU32},
Arc,
},
};
use zed_rpc::proto::{
self, MessageStream, RequestMessage, SendMessage, ServerMessage, SubscribeMessage,
};
use zed_rpc::proto::{self, EnvelopedMessage, MessageStream, RequestMessage};
pub struct RpcClient {
response_channels: Arc<Mutex<HashMap<i32, (mpsc::Sender<proto::from_server::Variant>, bool)>>>,
response_channels: Arc<Mutex<HashMap<u32, oneshot::Sender<proto::Envelope>>>>,
outgoing: Mutex<MessageStream<BoxedWriter>>,
next_message_id: AtomicI32,
next_message_id: AtomicU32,
_drop_tx: barrier::Sender,
}
@ -50,16 +48,14 @@ impl RpcClient {
response_channels,
outgoing: Mutex::new(MessageStream::new(Box::pin(conn_tx))),
_drop_tx,
next_message_id: AtomicI32::new(0),
next_message_id: AtomicU32::new(0),
})
}
async fn handle_incoming<Conn>(
conn: ReadHalf<Conn>,
mut drop_rx: barrier::Receiver,
response_channels: Arc<
Mutex<HashMap<i32, (mpsc::Sender<proto::from_server::Variant>, bool)>>,
>,
response_channels: Arc<Mutex<HashMap<u32, oneshot::Sender<proto::Envelope>>>>,
) where
Conn: AsyncRead + Unpin,
{
@ -68,36 +64,27 @@ impl RpcClient {
let mut stream = MessageStream::new(conn);
loop {
let read_message = stream.read_message::<proto::FromServer>();
let read_message = stream.read_message();
smol::pin!(read_message);
match futures::future::select(read_message, &mut dropped).await {
Either::Left((Ok(incoming), _)) => {
if let Some(variant) = incoming.variant {
if let Some(request_id) = incoming.request_id {
let channel = response_channels.lock().await.remove(&request_id);
if let Some((mut tx, oneshot)) = channel {
if tx.send(variant).await.is_ok() {
if !oneshot {
response_channels
.lock()
.await
.insert(request_id, (tx, false));
}
}
} else {
log::warn!(
"received RPC response to unknown request id {}",
request_id
);
}
if let Some(responding_to) = incoming.responding_to {
let channel = response_channels.lock().await.remove(&responding_to);
if let Some(mut tx) = channel {
tx.send(incoming).await.ok();
} else {
log::warn!(
"received RPC response to unknown request {}",
responding_to
);
}
} else {
log::warn!("received RPC message with no content");
// unprompted message from server
}
}
Either::Left((Err(error), _)) => {
log::warn!("invalid incoming RPC message {:?}", error);
log::warn!("received invalid RPC message {:?}", error);
}
Either::Right(_) => break,
}
@ -111,69 +98,37 @@ impl RpcClient {
let this = self.clone();
async move {
let message_id = this.next_message_id.fetch_add(1, atomic::Ordering::SeqCst);
let (tx, mut rx) = mpsc::channel(1);
this.response_channels
.lock()
.await
.insert(message_id, (tx, true));
let (tx, mut rx) = oneshot::channel();
this.response_channels.lock().await.insert(message_id, tx);
this.outgoing
.lock()
.await
.write_message(&proto::FromClient {
id: message_id,
variant: Some(req.to_variant()),
})
.write_message(&req.into_envelope(message_id, None))
.await?;
let response = rx
.recv()
.await
.expect("response channel was unexpectedly dropped");
T::Response::from_variant(response)
T::Response::from_envelope(response)
.ok_or_else(|| anyhow!("received response of the wrong t"))
}
}
pub fn send<T: SendMessage>(self: &Arc<Self>, message: T) -> impl Future<Output = Result<()>> {
pub fn send<T: EnvelopedMessage>(
self: &Arc<Self>,
message: T,
) -> impl Future<Output = Result<()>> {
let this = self.clone();
async move {
let message_id = this.next_message_id.fetch_add(1, atomic::Ordering::SeqCst);
this.outgoing
.lock()
.await
.write_message(&proto::FromClient {
id: message_id,
variant: Some(message.to_variant()),
})
.write_message(&message.into_envelope(message_id, None))
.await?;
Ok(())
}
}
pub fn subscribe<T: SubscribeMessage>(
self: &Arc<Self>,
subscription: T,
) -> impl Future<Output = Result<impl Stream<Item = Result<T::Event>>>> {
let this = self.clone();
async move {
let message_id = this.next_message_id.fetch_add(1, atomic::Ordering::SeqCst);
let (tx, rx) = mpsc::channel(256);
this.response_channels
.lock()
.await
.insert(message_id, (tx, false));
this.outgoing
.lock()
.await
.write_message(&proto::FromClient {
id: message_id,
variant: Some(subscription.to_variant()),
})
.await?;
Ok(rx.map(|event| {
T::Event::from_variant(event).ok_or_else(|| anyhow!("invalid event {:?}"))
}))
}
}
}
#[cfg(test)]
@ -199,133 +154,49 @@ mod tests {
let mut server_stream = MessageStream::new(server_conn);
let client = RpcClient::new(client_conn, executor.clone());
let client_req = client.request(proto::from_client::Auth {
let client_req = client.request(proto::Auth {
user_id: 42,
access_token: "token".to_string(),
});
smol::pin!(client_req);
let server_req = send_recv(
&mut client_req,
server_stream.read_message::<proto::FromClient>(),
)
.await
.unwrap();
let server_req = send_recv(&mut client_req, server_stream.read_message())
.await
.unwrap();
assert_eq!(
server_req.variant,
Some(proto::from_client::Variant::Auth(
proto::from_client::Auth {
user_id: 42,
access_token: "token".to_string()
}
))
server_req.payload,
Some(proto::envelope::Payload::Auth(proto::Auth {
user_id: 42,
access_token: "token".to_string()
}))
);
// Respond to another request to ensure requests are properly matched up.
server_stream
.write_message(&proto::FromServer {
request_id: Some(999),
variant: Some(proto::from_server::Variant::AuthResponse(
proto::from_server::AuthResponse {
credentials_valid: false,
},
)),
})
.write_message(
&proto::AuthResponse {
credentials_valid: false,
}
.into_envelope(1000, Some(999)),
)
.await
.unwrap();
server_stream
.write_message(&proto::FromServer {
request_id: Some(server_req.id),
variant: Some(proto::from_server::Variant::AuthResponse(
proto::from_server::AuthResponse {
credentials_valid: true,
},
)),
})
.write_message(
&proto::AuthResponse {
credentials_valid: true,
}
.into_envelope(1001, Some(server_req.id)),
)
.await
.unwrap();
assert_eq!(
client_req.await.unwrap(),
proto::from_server::AuthResponse {
proto::AuthResponse {
credentials_valid: true
}
);
}
#[gpui::test]
async fn test_subscribe(cx: gpui::TestAppContext) {
let executor = cx.read(|app| app.background_executor().clone());
let socket_dir_path = TempDir::new("subscribe").unwrap();
let socket_path = socket_dir_path.path().join(".sock");
let listener = UnixListener::bind(&socket_path).unwrap();
let client_conn = UnixStream::connect(&socket_path).await.unwrap();
let (server_conn, _) = listener.accept().await.unwrap();
let mut server_stream = MessageStream::new(server_conn);
let client = RpcClient::new(client_conn, executor.clone());
let mut events = client
.subscribe(proto::from_client::SubscribeToPathRequests {})
.await
.unwrap();
let subscription = server_stream
.read_message::<proto::FromClient>()
.await
.unwrap();
assert_eq!(
subscription.variant,
Some(proto::from_client::Variant::SubscribeToPathRequests(
proto::from_client::SubscribeToPathRequests {}
))
);
server_stream
.write_message(&proto::FromServer {
request_id: Some(subscription.id),
variant: Some(proto::from_server::Variant::PathRequest(
proto::from_server::PathRequest {
path: b"path-1".to_vec(),
},
)),
})
.await
.unwrap();
server_stream
.write_message(&proto::FromServer {
request_id: Some(99999),
variant: Some(proto::from_server::Variant::PathRequest(
proto::from_server::PathRequest {
path: b"path-2".to_vec(),
},
)),
})
.await
.unwrap();
server_stream
.write_message(&proto::FromServer {
request_id: Some(subscription.id),
variant: Some(proto::from_server::Variant::PathRequest(
proto::from_server::PathRequest {
path: b"path-3".to_vec(),
},
)),
})
.await
.unwrap();
assert_eq!(
events.recv().await.unwrap().unwrap(),
proto::from_server::PathRequest {
path: b"path-1".to_vec()
}
);
assert_eq!(
events.recv().await.unwrap().unwrap(),
proto::from_server::PathRequest {
path: b"path-3".to_vec()
}
);
}
#[gpui::test]
async fn test_drop_client(cx: gpui::TestAppContext) {
let executor = cx.read(|app| app.background_executor().clone());
@ -362,7 +233,7 @@ mod tests {
let client = RpcClient::new(client_conn, executor.clone());
let err = client
.request(proto::from_client::Auth {
.request(proto::Auth {
user_id: 42,
access_token: "token".to_string(),
})

4
zed/src/workspace.rs
View file

@ -673,8 +673,8 @@ impl Workspace {
let rpc_client = RpcClient::new(stream, executor);
let auth_response = rpc_client
.request(proto::from_client::Auth {
user_id: user_id.parse::<i32>()?,
.request(proto::Auth {
user_id: user_id.parse::<u64>()?,
access_token,
})
.await?;

14
zed/src/worktree.rs
View file

@ -32,7 +32,7 @@ use std::{
sync::{Arc, Weak},
time::{Duration, SystemTime, UNIX_EPOCH},
};
use zed_rpc::proto::{self, from_client::PathAndDigest};
use zed_rpc::proto;
use self::{char_bag::CharBag, ignore::IgnoreStack};
@ -234,23 +234,19 @@ impl Worktree {
self.rpc_client = Some(client.clone());
let snapshot = self.snapshot();
cx.spawn(|_this, cx| async move {
let files = cx
let paths = cx
.background_executor()
.spawn(async move {
snapshot
.paths()
.map(|path| PathAndDigest {
path: path.as_os_str().as_bytes().to_vec(),
digest: Default::default(),
})
.map(|path| path.as_os_str().as_bytes().to_vec())
.collect()
})
.await;
let share_response = client
.request(proto::from_client::ShareWorktree {
worktree_id: 0,
files,
.request(proto::ShareWorktree {
worktree: Some(proto::Worktree { paths }),
})
.await?;