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//! Composition state and ComposedServer core (constructor + route_request).
use std::collections::HashMap;
use std::sync::Arc;
use lsp_types_max::Diagnostic;
use serde_json::{json, Value};
use tokio::sync::{broadcast, Mutex};
use crate::jsonrpc::{Error, Request, Result};
use crate::Client;
use super::capability_tracker::CapabilityTracker;
use super::edit_gate::TransactionEditGate;
use super::strategy::method_strategy;
use super::upstream::PersistentUpstream;
use super::version_tracker::DocumentVersionTracker;
/// State manager for language server composition.
#[derive(Debug)]
pub struct CompositionState {
/// Tracks upstream capability changes and merges them.
pub capability_tracker: CapabilityTracker,
/// Tracks document open, change, and version states.
pub doc_tracker: DocumentVersionTracker,
/// Transactional guard to validate mutations.
pub edit_gate: TransactionEditGate,
/// Upstream request timeout config in milliseconds.
pub upstream_timeout_ms: u64,
/// Currently reported diagnostics mapped by source.
pub diagnostics: HashMap<String, HashMap<String, Value>>,
/// Monotonically increasing counter of requests.
pub request_counter: u64,
/// Trace history of requests.
pub request_traces: Arc<std::sync::Mutex<Vec<Value>>>,
}
impl CompositionState {
/// Creates a new composition state configured with the given upstreams.
pub fn new(upstream_addresses: Vec<(String, String)>) -> Self {
use super::strategy::UpstreamSource;
let mut tracker = CapabilityTracker::new();
for (id, addr) in upstream_addresses {
tracker.add_source(UpstreamSource::new(id, addr));
}
let upstream_timeout_ms = std::env::var("LSP_MAX_TIMEOUT")
.ok()
.and_then(|v| v.parse::<u64>().ok())
.unwrap_or(150);
Self {
capability_tracker: tracker,
doc_tracker: DocumentVersionTracker::new(),
edit_gate: TransactionEditGate::new(),
upstream_timeout_ms,
diagnostics: HashMap::new(),
request_counter: 0,
request_traces: Arc::new(std::sync::Mutex::new(Vec::new())),
}
}
}
/// Shared thread-safe handle to the composition state.
pub type SharedCompositionState = Arc<Mutex<CompositionState>>;
/// Composed LSP server that coordinates multiple upstream language servers.
#[derive(Debug)]
pub struct ComposedServer {
pub(super) _client: Client,
pub(super) state: SharedCompositionState,
pub(super) upstreams: Arc<dashmap::DashMap<String, PersistentUpstream>>,
}
impl ComposedServer {
/// Gets the shared composition state.
pub fn state(&self) -> &SharedCompositionState {
&self.state
}
/// Creates a new `ComposedServer` with a client handle and a list of upstream addresses.
pub fn new(client: Client, upstream_addresses: Vec<(String, String)>) -> Self {
let state = Arc::new(Mutex::new(CompositionState::new(
upstream_addresses.clone(),
)));
let upstreams = Arc::new(dashmap::DashMap::new());
let (unsolicited_tx, mut unsolicited_rx) = broadcast::channel(128);
let _upstreams_clone = upstreams.clone();
for (id, addr) in upstream_addresses {
let id_clone = id.clone();
let addr_clone = addr.clone();
let unsolicited_tx = unsolicited_tx.clone();
let upstreams_connections = upstreams.clone();
tokio::spawn(async move {
if let Some(conn) =
PersistentUpstream::connect(id_clone.clone(), addr_clone, 1000, unsolicited_tx)
.await
{
upstreams_connections.insert(id_clone, conn);
}
});
}
let client_clone = client.clone();
let state_clone = state.clone();
let upstreams_connections_clone = upstreams.clone();
tokio::spawn(async move {
loop {
match unsolicited_rx.recv().await {
Ok(notification) => {
let msg = notification.message;
let source_id = notification.source_id;
let method = match msg.get("method").and_then(|v| v.as_str()) {
Some(m) => m,
None => continue,
};
if method == "client/registerCapability" {
let mut valid_registrations = Vec::new();
if let Some(params) = msg.get("params") {
if let Some(registrations) =
params.get("registrations").and_then(|v| v.as_array())
{
let mut s = state_clone.lock().await;
for reg in registrations {
if let (Some(id), Some(m)) = (
reg.get("id").and_then(|v| v.as_str()),
reg.get("method").and_then(|v| v.as_str()),
) {
let options = reg
.get("registerOptions")
.cloned()
.unwrap_or(Value::Null);
if s.capability_tracker
.register_dynamic(id, m, &source_id, options)
{
valid_registrations.push(reg.clone());
}
}
}
}
}
let msg_id_opt = msg.get("id").cloned();
let client = client_clone.clone();
let upstreams_connections = upstreams_connections_clone.clone();
let source_id = source_id.clone();
if valid_registrations.is_empty() {
if let Some(msg_id) = msg_id_opt {
tokio::spawn(async move {
let resp = json!({ "jsonrpc": "2.0", "id": msg_id, "result": null });
if let Some(conn) = upstreams_connections.get(&source_id) {
let _ = conn.send_raw(resp).await;
}
});
}
} else {
let params = json!({ "registrations": valid_registrations });
tokio::spawn(async move {
let req_id = client.next_request_id();
let request =
Request::build("client/registerCapability".to_string())
.id(req_id.clone())
.params(params)
.finish();
let mut client_clone = client.clone();
use tower::Service;
let resp_res = client_clone.call(request).await;
if let Some(msg_id) = msg_id_opt {
let resp = match resp_res {
Ok(Some(response)) => {
let (_, result) = response.into_parts();
match result {
Ok(res) => {
json!({ "jsonrpc": "2.0", "id": msg_id, "result": res })
}
Err(err) => {
json!({ "jsonrpc": "2.0", "id": msg_id, "error": err })
}
}
}
_ => {
json!({ "jsonrpc": "2.0", "id": msg_id, "error": { "code": -32603, "message": "Internal error" } })
}
};
if let Some(conn) = upstreams_connections.get(&source_id) {
let _ = conn.send_raw(resp).await;
}
}
});
}
} else if method == "client/unregisterCapability" {
let mut valid_unregistrations = Vec::new();
if let Some(params) = msg.get("params") {
let unregs_opt = params
.get("unregisterations")
.and_then(|v| v.as_array())
.or_else(|| {
params.get("unregistrations").and_then(|v| v.as_array())
});
if let Some(unregistrations) = unregs_opt {
let mut s = state_clone.lock().await;
for unreg in unregistrations {
if let Some(id) = unreg.get("id").and_then(|v| v.as_str()) {
if s.capability_tracker.unregister_dynamic(id) {
valid_unregistrations.push(unreg.clone());
}
}
}
}
}
let msg_id_opt = msg.get("id").cloned();
let client = client_clone.clone();
let upstreams_connections = upstreams_connections_clone.clone();
let source_id = source_id.clone();
if valid_unregistrations.is_empty() {
if let Some(msg_id) = msg_id_opt {
tokio::spawn(async move {
let resp = json!({ "jsonrpc": "2.0", "id": msg_id, "result": null });
if let Some(conn) = upstreams_connections.get(&source_id) {
let _ = conn.send_raw(resp).await;
}
});
}
} else {
let params = json!({ "unregistrations": valid_unregistrations });
tokio::spawn(async move {
let req_id = client.next_request_id();
let request =
Request::build("client/unregisterCapability".to_string())
.id(req_id.clone())
.params(params)
.finish();
let mut client_clone = client.clone();
use tower::Service;
let resp_res = client_clone.call(request).await;
if let Some(msg_id) = msg_id_opt {
let resp = match resp_res {
Ok(Some(response)) => {
let (_, result) = response.into_parts();
match result {
Ok(res) => {
json!({ "jsonrpc": "2.0", "id": msg_id, "result": res })
}
Err(err) => {
json!({ "jsonrpc": "2.0", "id": msg_id, "error": err })
}
}
}
_ => {
json!({ "jsonrpc": "2.0", "id": msg_id, "error": { "code": -32603, "message": "Internal error" } })
}
};
if let Some(conn) = upstreams_connections.get(&source_id) {
let _ = conn.send_raw(resp).await;
}
}
});
}
} else if method == "textDocument/publishDiagnostics" {
if let Some(params) = msg.get("params") {
if let Some(uri) = params.get("uri").and_then(|v| v.as_str()) {
let diagnostics_val =
params.get("diagnostics").cloned().unwrap_or(json!([]));
let (merged_diags, version) = {
let mut s = state_clone.lock().await;
s.diagnostics
.entry(uri.to_string())
.or_default()
.insert(source_id.clone(), diagnostics_val);
let mut flat_diags = Vec::new();
if let Some(uri_diags) = s.diagnostics.get(uri) {
for (src_id, diags_value) in uri_diags {
if let Some(src) =
s.capability_tracker.sources.get(src_id)
{
if src.is_routable() {
if let Some(diags_arr) =
diags_value.as_array()
{
for diag in diags_arr {
if src_id == "ggen-lsp" {
let has_source_id = diag
.get("data")
.and_then(|data| {
data.get("source_id")
})
.is_some();
if !has_source_id {
continue;
}
}
let mut diag_clone = diag.clone();
if let Some(obj) =
diag_clone.as_object_mut()
{
obj.insert(
"source".to_string(),
Value::String(
src_id.clone(),
),
);
}
flat_diags.push(diag_clone);
}
}
}
}
}
}
let version = s.doc_tracker.current_version(uri);
(flat_diags, version)
};
if let Ok(diag_list) = serde_json::from_value::<Vec<Diagnostic>>(
Value::Array(merged_diags),
) {
if let Ok(parsed_uri) =
<lsp_types_max::Uri as std::str::FromStr>::from_str(uri)
{
client_clone
.publish_diagnostics(parsed_uri, diag_list, version)
.await;
}
}
}
}
}
}
Err(broadcast::error::RecvError::Lagged(n)) => {
tracing::warn!("Unsolicited message channel lagged by {} messages", n);
}
Err(broadcast::error::RecvError::Closed) => {
break;
}
}
}
});
Self {
_client: client,
state,
upstreams,
}
}
pub(super) async fn route_request<P, R>(&self, method: &str, params: P) -> Result<Option<R>>
where
P: serde::Serialize,
R: serde::de::DeserializeOwned,
{
tracing::trace!("--- route_request [{}] start", method);
let params_val = serde_json::to_value(params).unwrap_or(Value::Null);
tracing::trace!("--- route_request [{}] locking state at start", method);
let (request_id, strategy_str, uri_opt, doc_version) = {
let mut s = self.state.lock().await;
tracing::trace!(
"--- route_request [{}] locked state at start inside block",
method
);
s.request_counter += 1;
let counter = s.request_counter;
let strategy = method_strategy(method);
let uri = params_val
.get("textDocument")
.and_then(|td| td.get("uri"))
.and_then(|u| u.as_str())
.map(|s| s.to_string())
.or_else(|| {
params_val
.get("uri")
.and_then(|u| u.as_str())
.map(|s| s.to_string())
});
let ver = uri.as_ref().and_then(|u| s.doc_tracker.current_version(u));
(
format!("req_{}", counter),
format!("{:?}", strategy),
uri,
ver,
)
};
tracing::trace!("--- route_request [{}] strategy: {}", method, strategy_str);
let sources_contacted = Arc::new(std::sync::Mutex::new(Vec::<String>::new()));
let sources_returned = Arc::new(std::sync::Mutex::new(Vec::<String>::new()));
let source_health = Arc::new(std::sync::Mutex::new(std::collections::HashMap::<
String,
String,
>::new()));
let gate_outcome = Arc::new(std::sync::Mutex::new(None::<String>));
let staleness_outcome = Arc::new(std::sync::Mutex::new(None::<String>));
let res = self
.route_request_internal(
method,
params_val,
sources_contacted.clone(),
sources_returned.clone(),
source_health.clone(),
gate_outcome.clone(),
staleness_outcome.clone(),
)
.await;
let final_response_val = match &res {
Ok(Some(v)) => v.clone(),
_ => Value::Null,
};
// Record the trace
{
let s = self.state.lock().await;
let trace = json!({
"request_id": request_id,
"method": method,
"document_uri": uri_opt,
"document_version": doc_version,
"strategy": strategy_str,
"sources_contacted": *sources_contacted.lock().unwrap(),
"sources_returned": *sources_returned.lock().unwrap(),
"source_health": *source_health.lock().unwrap(),
"gate_outcome": *gate_outcome.lock().unwrap(),
"staleness_outcome": *staleness_outcome.lock().unwrap(),
"final_response": final_response_val,
});
s.request_traces.lock().unwrap().push(trace);
}
match res {
Ok(Some(v)) => match serde_json::from_value::<R>(v) {
Ok(r) => Ok(Some(r)),
Err(e) => Err(Error::invalid_params(format!(
"Failed to deserialize response: {}",
e
))),
},
Ok(None) => Ok(None),
Err(e) => Err(e),
}
}
}