Add LSP benchmark mimicking the one on quick-lint-js

cli/Cargo.toml

@@ -19,6 +19,11 @@ name = "deno_bench"
 harness = false
 path = "./bench/main.rs"
 
+[[bench]]
+name = "lsp_bench_standalone"
+harness = false
+path = "./bench/lsp_bench_standalone.rs"
+
 [build-dependencies]
 deno_broadcast_channel = { version = "0.25.0", path = "../ext/broadcast_channel" }
 deno_console = { version = "0.31.0", path = "../ext/console" }
@@ -100,6 +105,8 @@ pretty_assertions = "=0.7.2"
 test_util = { path = "../test_util" }
 trust-dns-client = "=0.20.3"
 trust-dns-server = "=0.20.3"
+deno_bench_util = { version = "0.25.0", path = "../bench_util" }
+
 
 [target.'cfg(unix)'.dev-dependencies]
 nix = "=0.22.1"

cli/bench/lsp_bench_standalone.rs

@@ -0,0 +1,75 @@
+use deno_bench_util::bencher::benchmark_group;
+use deno_bench_util::bencher::benchmark_main;
+use deno_bench_util::bencher::Bencher;
+use deno_core::serde_json;
+use deno_core::serde_json::json;
+use deno_core::serde_json::Value;
+
+// Intended to match the benchmark in quick-lint-js
+// https://github.com/quick-lint/quick-lint-js/blob/35207e6616267c6c81be63f47ce97ec2452d60df/benchmark/benchmark-lsp/lsp-benchmarks.cpp#L223-L268
+fn incremental_change_wait(bench: &mut Bencher) {
+  let deno_exe = test_util::deno_exe_path();
+  let mut client = test_util::lsp::LspClient::new(&deno_exe).unwrap();
+
+  static FIXTURE_INIT_JSON: &[u8] =
+    include_bytes!("testdata/initialize_params.json");
+  let params: Value = serde_json::from_slice(FIXTURE_INIT_JSON).unwrap();
+  let (_, maybe_err) = client
+    .write_request::<_, _, Value>("initialize", params)
+    .unwrap();
+  assert!(maybe_err.is_none());
+  client.write_notification("initialized", json!({})).unwrap();
+
+  client
+    .write_notification(
+      "textDocument/didOpen",
+      json!({
+        "textDocument": {
+          "uri": "file:///testdata/express-router.js",
+          "languageId": "javascript",
+          "version": 0,
+          "text": include_str!("testdata/express-router.js")
+        }
+      }),
+    )
+    .unwrap();
+  let (method, maybe_diag): (String, Option<Value>) =
+    client.read_notification().unwrap();
+  assert_eq!(method, "textDocument/publishDiagnostics");
+  let _expected_num_diagnostics = get_num_diagnostics(maybe_diag);
+
+  let mut version = 0;
+  bench.iter(|| {
+      let text = format!("m{:05}", version);
+      client
+        .write_notification(
+          "textDocument/didChange",
+          json!({
+              "textDocument": {
+                  "version": version,
+                  "uri":"file:///testdata/express-router.js"
+              },
+              "contentChanges":[
+                {"text": text, "range":{"start":{"line":506,"character":39},"end":{"line":506,"character":45}}},
+                {"text": text, "range":{"start":{"line":507,"character":8},"end":{"line":507,"character":14}}},
+                {"text": text, "range":{"start":{"line":509,"character":10},"end":{"line":509,"character":16}}}
+              ]
+          })
+      ).unwrap();
+      let (method, maybe_diag): (String, Option<Value>) =
+        client.read_notification().unwrap();
+      assert_eq!(method, "textDocument/publishDiagnostics");
+      let _num_diagnostics = get_num_diagnostics(maybe_diag);
+      //assert_eq!(num_diagnostics, expected_num_diagnostics);
+      version += 1;
+    })
+}
+
+fn get_num_diagnostics(maybe_diag: Option<Value>) -> usize {
+  let d = maybe_diag.unwrap();
+  let msg = d.as_object().unwrap();
+  msg.get("diagnostics").unwrap().as_array().unwrap().len()
+}
+
+benchmark_group!(benches, incremental_change_wait);
+benchmark_main!(benches);