fix: limit concurrency when generating BUILD files in npm_install and…

… yarn_install (#3509)

* chore: add .gitattributes to ignore changes in generated docs files on PR reviews

* fix: limit concurrency when generating BUILD files in npm_install and yarn_install

.gitattributes

@@ -0,0 +1,12 @@
+docs/Built-ins.md linguist-generated=true
+docs/Concatjs.md linguist-generated=true
+docs/Cypress.md linguist-generated=true
+docs/esbuild.md linguist-generated=true
+docs/Jasmine.md linguist-generated=true
+docs/Karma.md linguist-generated=true
+docs/Protractor.md linguist-generated=true
+docs/Providers.md linguist-generated=true
+docs/Rollup.md linguist-generated=true
+docs/Terser.md linguist-generated=true
+docs/Toolchains.md linguist-generated=true
+docs/TypeScript.md linguist-generated=true

internal/npm_install/generate_build_file.ts

@@ -55,6 +55,7 @@ let LEGACY_NODE_MODULES_PACKAGE_NAME = '$node_modules$';
 let config: any = {
   exports_directories_only: false,
   generate_local_modules_build_files: false,
+  generate_build_files_concurrency_limit: 64,
   included_files: [],
   links: {},
   package_json: 'package.json',
@@ -688,7 +689,7 @@ async function findPackagesAndPush(pkgs: Dep[], p: string, dependencies: Set<str
 
   const listing = await fs.readdir(p);
 
-  await Promise.all(listing.map(async f => {
+  let promises = listing.map(async f => {
     // filter out folders such as `.bin` which can create
     // issues on Windows since these are "hidden" by default
     if (f.startsWith('.')) return [];
@@ -702,7 +703,17 @@ async function findPackagesAndPush(pkgs: Dep[], p: string, dependencies: Set<str
         await findPackagesAndPush(pkgs, path.posix.join(pf, 'node_modules'), dependencies);
       }
     }
-  }));
+  });
+
+  if (config.generate_build_files_concurrency_limit < 1) {
+    // unlimited concurrency
+    await Promise.all(promises);
+  } else {
+    while (promises.length) {
+      // run batches of generate_build_files_concurrency_limit at a time
+      await Promise.all(promises.splice(0, config.generate_build_files_concurrency_limit))
+    }
+  }
 }
 
 /**

internal/npm_install/index.js

@@ -13,6 +13,7 @@ let LEGACY_NODE_MODULES_PACKAGE_NAME = '$node_modules$';
 let config = {
     exports_directories_only: false,
     generate_local_modules_build_files: false,
+    generate_build_files_concurrency_limit: 64,
     included_files: [],
     links: {},
     package_json: 'package.json',
@@ -443,7 +444,7 @@ async function findPackagesAndPush(pkgs, p, dependencies) {
         return;
     }
     const listing = await fs_1.promises.readdir(p);
-    await Promise.all(listing.map(async (f) => {
+    let promises = listing.map(async (f) => {
         if (f.startsWith('.'))
             return [];
         const pf = path.posix.join(p, f);
@@ -456,7 +457,15 @@ async function findPackagesAndPush(pkgs, p, dependencies) {
                 await findPackagesAndPush(pkgs, path.posix.join(pf, 'node_modules'), dependencies);
             }
         }
-    }));
+    });
+    if (config.generate_build_files_concurrency_limit < 1) {
+        await Promise.all(promises);
+    }
+    else {
+        while (promises.length) {
+            await Promise.all(promises.splice(0, config.generate_build_files_concurrency_limit));
+        }
+    }
 }
 async function findScopes() {
     const p = nodeModulesFolder();

internal/npm_install/npm_install.bzl

@@ -359,6 +359,14 @@ Using managed_directories will mean that
         default = 3600,
         doc = """Maximum duration of the package manager execution in seconds.""",
     ),
+    "generate_build_files_concurrency_limit": attr.int(
+        default = 64,
+        doc = """Limit the maximum concurrency of npm package processing when generating
+        BUILD files from the node_modules tree. Unlimited concurrency can lead to too many
+        open files errors (https://github.com/bazelbuild/rules_nodejs/issues/3507).
+
+        Set to 0 or negative for unlimited concurrency.""",
+    ),
 })
 
 def _apply_pre_install_patches(repository_ctx):
@@ -466,6 +474,7 @@ def _create_build_files(repository_ctx, rule_type, node, lock_file, generate_loc
     generate_config_json = json.encode(
         struct(
             exports_directories_only = repository_ctx.attr.exports_directories_only,
+            generate_build_files_concurrency_limit = repository_ctx.attr.generate_build_files_concurrency_limit,
             generate_local_modules_build_files = generate_local_modules_build_files,
             included_files = repository_ctx.attr.included_files,
             links = validated_links,
@@ -475,8 +484,8 @@ def _create_build_files(repository_ctx, rule_type, node, lock_file, generate_loc
             rule_type = rule_type,
             strict_visibility = repository_ctx.attr.strict_visibility,
             workspace = repository_ctx.attr.name,
-            workspace_rerooted_path = _WORKSPACE_REROOTED_PATH,
             workspace_rerooted_package_json_dir = paths.normalize(paths.join(_WORKSPACE_REROOTED_PATH, package_json_dir)),
+            workspace_rerooted_path = _WORKSPACE_REROOTED_PATH,
         ),
     )
     repository_ctx.file("generate_config.json", generate_config_json)

npm_deps.bzl

@@ -163,24 +163,28 @@ js_library(
         },
         package_json = "//internal/linker/test/multi_linker/test_a:package.json",
         yarn_lock = "//internal/linker/test/multi_linker/test_a:yarn.lock",
+        generate_build_files_concurrency_limit = 0,
     )
 
     yarn_install(
         name = "internal_test_multi_linker_test_b_deps",
         package_json = "//internal/linker/test/multi_linker/test_b:package.json",
         yarn_lock = "//internal/linker/test/multi_linker/test_b:yarn.lock",
+        generate_build_files_concurrency_limit = 0,
     )
 
     yarn_install(
         name = "internal_test_multi_linker_test_c_deps",
         package_json = "//internal/linker/test/multi_linker/test_c:package.json",
         yarn_lock = "//internal/linker/test/multi_linker/test_c:yarn.lock",
+        generate_build_files_concurrency_limit = 0,
     )
 
     yarn_install(
         name = "internal_test_multi_linker_test_d_deps",
         package_json = "//internal/linker/test/multi_linker/test_d:package.json",
         yarn_lock = "//internal/linker/test/multi_linker/test_d:yarn.lock",
+        generate_build_files_concurrency_limit = 0,
     )
 
     yarn_install(
@@ -189,6 +193,7 @@ js_library(
         args = ["--production"],
         package_json = "//internal/linker/test/multi_linker/lib_b:package.json",
         yarn_lock = "//internal/linker/test/multi_linker/lib_b:yarn.lock",
+        generate_build_files_concurrency_limit = 0,
     )
 
     yarn_install(
@@ -197,6 +202,7 @@ js_library(
         args = ["--production"],
         package_json = "//internal/linker/test/multi_linker/lib_c:lib/package.json",
         yarn_lock = "//internal/linker/test/multi_linker/lib_c:lib/yarn.lock",
+        generate_build_files_concurrency_limit = 0,
     )
 
     yarn_install(