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@ -1,19 +1,44 @@
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use std::{
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use std::collections::HashMap;
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collections::HashMap,
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process::{ChildStderr, ChildStdin, ChildStdout, Command, Stdio},
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};
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use jsonrpc_core as jsonrpc;
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use lsp_types as lsp;
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use serde::{Deserialize, Serialize};
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use serde_json::Value;
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use smol::channel::{Receiver, Sender};
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use smol::io::{BufReader, BufWriter};
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use smol::io::{BufReader, BufWriter};
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use smol::prelude::*;
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use smol::prelude::*;
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use smol::Unblock;
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use smol::process::{Child, ChildStderr, ChildStdin, ChildStdout, Command, Stdio};
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use smol::Executor;
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use futures_util::{select, FutureExt};
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/// A type representing all possible values sent from the server to the client.
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#[derive(Debug, PartialEq, Clone, Deserialize, Serialize)]
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#[serde(deny_unknown_fields)]
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#[serde(untagged)]
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enum Message {
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/// A regular JSON-RPC request output (single response).
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Output(jsonrpc::Output),
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/// A notification.
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Notification(jsonrpc::Notification),
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/// A JSON-RPC request
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Call(jsonrpc::Call),
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}
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pub struct Client {
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process: Child,
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stderr: BufReader<ChildStderr>,
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outgoing: Sender<Payload>,
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pub request_counter: u64,
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struct Client {
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capabilities: Option<lsp::ServerCapabilities>,
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// process: Command,
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reader: BufReader<Unblock<ChildStdout>>,
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}
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}
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impl Client {
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impl Client {
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fn start(cmd: &str, args: &[String]) -> Self {
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pub fn start(ex: &Executor, cmd: &str, args: &[String]) -> Self {
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let mut process = Command::new(cmd)
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let mut process = Command::new(cmd)
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.args(args)
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.args(args)
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.stdin(Stdio::piped())
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.stdin(Stdio::piped())
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@ -21,51 +46,332 @@ impl Client {
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.stderr(Stdio::piped())
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.stderr(Stdio::piped())
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.spawn()
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.spawn()
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.expect("Failed to start language server");
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.expect("Failed to start language server");
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// TODO: impl drop that kills the process
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// smol makes sure the process is reaped on drop, but using kill_on_drop(true) maybe?
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// TODO: do we need bufreader/writer here? or do we use async wrappers on unblock?
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// TODO: do we need bufreader/writer here? or do we use async wrappers on unblock?
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let writer = BufWriter::new(Unblock::new(
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let writer = BufWriter::new(process.stdin.take().expect("Failed to open stdin"));
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process.stdin.take().expect("Failed to open stdin"),
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let reader = BufReader::new(process.stdout.take().expect("Failed to open stdout"));
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));
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let stderr = BufReader::new(process.stderr.take().expect("Failed to open stderr"));
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let reader = BufReader::new(Unblock::new(
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process.stdout.take().expect("Failed to open stdout"),
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let (incoming, outgoing) = Transport::start(ex, reader, writer);
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));
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let stderr = BufReader::new(Unblock::new(
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Client {
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process.stderr.take().expect("Failed to open stderr"),
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process,
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));
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stderr,
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outgoing,
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request_counter: 0,
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capabilities: None,
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}
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}
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fn next_request_id(&mut self) -> jsonrpc::Id {
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let id = jsonrpc::Id::Num(self.request_counter);
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self.request_counter += 1;
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id
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}
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fn to_params(value: Value) -> anyhow::Result<jsonrpc::Params> {
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use jsonrpc::Params;
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let params = match value {
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Value::Null => Params::None,
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Value::Bool(_) | Value::Number(_) | Value::String(_) => Params::Array(vec![value]),
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Value::Array(vec) => Params::Array(vec),
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Value::Object(map) => Params::Map(map),
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};
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Ok(params)
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}
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pub async fn request<R: lsp::request::Request>(
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&mut self,
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params: R::Params,
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) -> anyhow::Result<R::Result>
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where
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R::Params: serde::Serialize,
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R::Result: core::fmt::Debug, // TODO: temporary
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{
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let params = serde_json::to_value(params)?;
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let request = jsonrpc::MethodCall {
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jsonrpc: Some(jsonrpc::Version::V2),
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id: self.next_request_id(),
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method: R::METHOD.to_string(),
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params: Self::to_params(params)?,
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};
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let (tx, rx) = smol::channel::bounded::<anyhow::Result<Value>>(1);
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self.outgoing
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.send(Payload::Request {
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chan: tx,
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value: request,
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})
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.await?;
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let response = rx.recv().await??;
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let response = serde_json::from_value(response)?;
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// TODO: we should pass request to a sender thread via a channel
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// so it can't be interleaved
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// TODO: responses can be out of order, we need to register a single shot response channel
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Ok(response)
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}
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pub async fn notify<R: lsp::notification::Notification>(
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&mut self,
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params: R::Params,
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) -> anyhow::Result<()>
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where
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R::Params: serde::Serialize,
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{
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let params = serde_json::to_value(params)?;
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let notification = jsonrpc::Notification {
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jsonrpc: Some(jsonrpc::Version::V2),
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method: R::METHOD.to_string(),
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params: Self::to_params(params)?,
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};
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self.outgoing
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.send(Payload::Notification(notification))
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.await?;
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Ok(())
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}
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// -------------------------------------------------------------------------------------------
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// General messages
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// -------------------------------------------------------------------------------------------
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pub async fn initialize(&mut self) -> anyhow::Result<()> {
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// TODO: delay any requests that are triggered prior to initialize
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#[allow(deprecated)]
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let params = lsp::InitializeParams {
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process_id: Some(u64::from(std::process::id())),
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root_path: None,
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// root_uri: Some(lsp_types::Url::parse("file://localhost/")?),
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root_uri: None, // set to project root in the future
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initialization_options: None,
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capabilities: lsp::ClientCapabilities::default(),
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trace: None,
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workspace_folders: None,
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client_info: None,
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};
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let response = self.request::<lsp::request::Initialize>(params).await?;
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self.capabilities = Some(response.capabilities);
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// next up, notify<initialized>
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self.notify::<lsp::notification::Initialized>(lsp::InitializedParams {})
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.await?;
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Ok(())
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}
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pub async fn shutdown(&mut self) -> anyhow::Result<()> {
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self.request::<lsp::request::Shutdown>(()).await
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}
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pub async fn exit(&mut self) -> anyhow::Result<()> {
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self.notify::<lsp::notification::Exit>(()).await
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}
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// -------------------------------------------------------------------------------------------
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// Text document
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// -------------------------------------------------------------------------------------------
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pub async fn text_document_did_open(&mut self) -> anyhow::Result<()> {
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self.notify::<lsp::notification::DidOpenTextDocument>(lsp::DidOpenTextDocumentParams {
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text_document: lsp::TextDocumentItem {
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uri: lsp::Url::parse(".")?,
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language_id: "rust".to_string(),
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version: 0,
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text: "".to_string(),
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},
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})
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.await
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}
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Client { reader }
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pub async fn text_document_did_change(&mut self) -> anyhow::Result<()> {
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unimplemented!()
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}
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}
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async fn receiver(&mut self) -> Result<(), std::io::Error> {
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// will_save / will_save_wait_until
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let mut headers: HashMap<String, String> = HashMap::default();
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pub async fn text_document_did_save(&mut self) -> anyhow::Result<()> {
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unimplemented!()
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}
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pub async fn text_document_did_close(&mut self) -> anyhow::Result<()> {
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unimplemented!()
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}
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}
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enum Payload {
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Request {
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chan: Sender<anyhow::Result<Value>>,
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value: jsonrpc::MethodCall,
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},
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Notification(jsonrpc::Notification),
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}
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struct Transport {
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incoming: Sender<Message>,
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outgoing: Receiver<Payload>,
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pending_requests: HashMap<jsonrpc::Id, Sender<anyhow::Result<Value>>>,
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headers: HashMap<String, String>,
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writer: BufWriter<ChildStdin>,
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reader: BufReader<ChildStdout>,
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}
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impl Transport {
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pub fn start(
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ex: &Executor,
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reader: BufReader<ChildStdout>,
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writer: BufWriter<ChildStdin>,
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) -> (Receiver<Message>, Sender<Payload>) {
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let (incoming, rx) = smol::channel::unbounded();
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let (tx, outgoing) = smol::channel::unbounded();
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let transport = Self {
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reader,
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writer,
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incoming,
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outgoing,
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pending_requests: Default::default(),
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headers: Default::default(),
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};
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ex.spawn(transport.duplex()).detach();
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(rx, tx)
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}
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async fn recv(
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reader: &mut (impl AsyncBufRead + Unpin),
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headers: &mut HashMap<String, String>,
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) -> Result<Message, std::io::Error> {
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// read headers
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loop {
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loop {
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// read headers
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let mut header = String::new();
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loop {
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// detect pipe closed if 0
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let mut header = String::new();
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reader.read_line(&mut header).await?;
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// detect pipe closed if 0
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let header = header.trim();
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self.reader.read_line(&mut header).await?;
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let header = header.trim();
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if header.is_empty() {
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break;
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}
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let parts: Vec<&str> = header.split(": ").collect();
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if header.is_empty() {
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if parts.len() != 2 {
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break;
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// return Err(Error::new(ErrorKind::Other, "Failed to parse header"));
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panic!()
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}
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headers.insert(parts[0].to_string(), parts[1].to_string());
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}
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}
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// find content-length
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let parts: Vec<&str> = header.split(": ").collect();
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if parts.len() != 2 {
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// return Err(Error::new(ErrorKind::Other, "Failed to parse header"));
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panic!()
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}
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headers.insert(parts[0].to_string(), parts[1].to_string());
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}
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// find content-length
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let content_length = headers.get("Content-Length").unwrap().parse().unwrap();
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let mut content = vec![0; content_length];
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reader.read_exact(&mut content).await?;
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let msg = String::from_utf8(content).unwrap();
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// read data
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// try parsing as output (server response) or call (server request)
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let output: serde_json::Result<Message> = serde_json::from_str(&msg);
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// read data
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Ok(output?)
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// decode via serde_json decoding into jsonrpc_core Output
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}
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break;
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pub async fn send_payload(&mut self, payload: Payload) -> anyhow::Result<()> {
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match payload {
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Payload::Request { chan, value } => {
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self.pending_requests.insert(value.id.clone(), chan);
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let json = serde_json::to_string(&value)?;
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self.send(json).await
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}
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Payload::Notification(value) => {
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let json = serde_json::to_string(&value)?;
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self.send(json).await
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}
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}
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}
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}
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pub async fn send(&mut self, request: String) -> anyhow::Result<()> {
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println!("-> {}", request);
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// send the headers
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self.writer
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.write_all(format!("Content-Length: {}\r\n\r\n", request.len()).as_bytes())
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.await?;
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// send the body
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self.writer.write_all(request.as_bytes()).await?;
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self.writer.flush().await?;
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Ok(())
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Ok(())
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}
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}
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pub async fn recv_response(&mut self, output: jsonrpc::Output) -> anyhow::Result<()> {
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match output {
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jsonrpc::Output::Success(jsonrpc::Success { id, result, .. }) => {
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println!("<- {}", result);
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let tx = self
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.pending_requests
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.remove(&id)
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.expect("pending_request with id not found!");
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tx.send(Ok(result)).await?;
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}
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jsonrpc::Output::Failure(_) => panic!("recv fail"),
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msg => unimplemented!("{:?}", msg),
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}
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Ok(())
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}
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pub async fn duplex(mut self) {
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loop {
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select! {
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// client -> server
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msg = self.outgoing.next().fuse() => {
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if msg.is_none() {
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break;
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}
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let msg = msg.unwrap();
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self.send_payload(msg).await.unwrap();
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}
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// server <- client
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msg = Self::recv(&mut self.reader, &mut self.headers).fuse() => {
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if msg.is_err() {
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break;
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}
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let msg = msg.unwrap();
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match msg {
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Message::Output(output) => self.recv_response(output).await.unwrap(),
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Message::Notification(_) => {
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// dispatch
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}
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Message::Call(_) => {
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// dispatch
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}
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};
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}
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}
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}
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}
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}
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}
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Blaž Hrastnik
4 years ago