start working on jsg/rust integration

.bazelrc

@@ -160,6 +160,7 @@ build --cxxopt="-fbracket-depth=512" --host_cxxopt="-fbracket-depth=512"
 build --@rules_rust//:extra_rustc_flag=-Cdebug-assertions=n
 build --@rules_rust//:extra_exec_rustc_flags=-Cdebug-assertions=n
 build --@rules_rust//:rustfmt.toml=//src/rust:rustfmt.toml
+build --@rules_rust//rust/toolchain/channel=nightly
 
 # We default to not enabling debug assertions and unwinding for Rust. For debug builds this is not
 # the right setting, but unfortunately we can't set that directly.

build/rust_lint.bazelrc

@@ -23,7 +23,7 @@ build:rust-enable-clippy-checks --output_groups=+clippy_checks
 # - clippy::non_std_lazy_statics – triggers on lazy_static, non-trivial to replace
 # - clippy::format_push_string – avoids single memory allocation, but makes code less readable
 # - clippy::cast_possible_truncation - usize/u64 conversion warning is unbelievably noisy
-build:rust-enable-clippy-checks --@rules_rust//:clippy_flags=-Wclippy::pedantic,-Wclippy::redundant_clone,-Wclippy::str_to_string,-Wclippy::string_to_string,-Wclippy::to_string_in_format_args,-Wclippy::unnecessary_to_owned,-Wclippy::implicit_clone,-Wclippy::suspicious_to_owned,-Wclippy::unnecessary_to_owned,-Wclippy::nursery,-Wclippy::dbg_macro,-Wclippy::unwrap_used,-Wclippy::allow_attributes,-Aclippy::missing_const_for_fn,-Aclippy::cognitive_complexity,-Aclippy::trait_duplication_in_bounds,-Aclippy::non_send_fields_in_send_ty,-Aclippy::option_if_let_else,-Aclippy::missing_errors_doc,-Aclippy::must_use_candidate,-Aclippy::future_not_send,-Aclippy::trivial_regex,-Aclippy::literal_string_with_formatting_args,-Aclippy::non_std_lazy_statics,-Aclippy::format_push_string,-Aclippy::cast_possible_truncation,-Dwarnings
+build:rust-enable-clippy-checks --@rules_rust//:clippy_flags=-Wclippy::pedantic,-Wclippy::redundant_clone,-Wclippy::str_to_string,-Wclippy::to_string_in_format_args,-Wclippy::unnecessary_to_owned,-Wclippy::implicit_clone,-Wclippy::suspicious_to_owned,-Wclippy::unnecessary_to_owned,-Wclippy::nursery,-Wclippy::dbg_macro,-Wclippy::unwrap_used,-Wclippy::allow_attributes,-Aclippy::missing_const_for_fn,-Aclippy::cognitive_complexity,-Aclippy::trait_duplication_in_bounds,-Aclippy::non_send_fields_in_send_ty,-Aclippy::option_if_let_else,-Aclippy::missing_errors_doc,-Aclippy::must_use_candidate,-Aclippy::future_not_send,-Aclippy::trivial_regex,-Aclippy::literal_string_with_formatting_args,-Aclippy::non_std_lazy_statics,-Aclippy::format_push_string,-Aclippy::cast_possible_truncation,-Dwarnings
 build --@rules_rust//rust/settings:clippy.toml=//src/rust:clippy.toml
 
 # enable rustfmt checks

build/wd_rust_proc_macro.bzl

@@ -0,0 +1,54 @@
+load("@rules_rust//rust:defs.bzl", "rust_proc_macro", "rust_test")
+
+def wd_rust_proc_macro(
+        name,
+        deps = [],
+        data = [],
+        test_env = {},
+        test_tags = [],
+        test_deps = [],
+        visibility = None):
+    """Define rust procedural macro crate.
+
+    Args:
+        name: crate name.
+        deps: crate dependencies: rust crates (typically includes proc-macro2, quote, syn).
+        data: additional data files.
+        test_env: additional test environment variables.
+        test_tags: additional test tags.
+        test_deps: test-only dependencies.
+        visibility: crate visibility.
+    """
+    srcs = native.glob(["**/*.rs"])
+    crate_name = name.replace("-", "_")
+
+    rust_proc_macro(
+        name = name,
+        crate_name = crate_name,
+        srcs = srcs,
+        deps = deps + ["@workerd//deps/rust:runtime"],
+        visibility = visibility,
+        data = data,
+        target_compatible_with = select({
+            "@//build/config:no_build": ["@platforms//:incompatible"],
+            "//conditions:default": [],
+        }),
+    )
+
+    rust_test(
+        name = name + "_test",
+        crate = ":" + name,
+        env = {
+            "RUST_BACKTRACE": "1",
+            # rust test runner captures stderr by default, which makes debugging tests very hard
+            "RUST_TEST_NOCAPTURE": "1",
+            # our tests are usually very heavy and do not support concurrent invocation
+            "RUST_TEST_THREADS": "1",
+        } | test_env,
+        tags = test_tags,
+        deps = test_deps,
+        experimental_use_cc_common_link = select({
+            "@platforms//os:windows": 0,
+            "//conditions:default": 1,
+        }),
+    )

compile_flags.txt

@@ -54,13 +54,14 @@
 -isystembazel-bin/src/rust/cxx-integration/_virtual_includes/cxx-include/
 -isystembazel-bin/src/rust/cxx-integration/_virtual_includes/cxx-integration@cxx
 -isystembazel-bin/src/rust/cxx-integration-test/_virtual_includes/cxx-integration-test@cxx
--isystembazel-bin/src/rust/dns/_virtual_includes/dns@cxx
 -isystembazel-bin/src/rust/kj/_virtual_includes/http.rs@cxx
 -isystembazel-bin/src/rust/kj/_virtual_includes/io.rs@cxx
 -isystembazel-bin/src/rust/kj/tests/_virtual_includes/lib.rs@cxx
 -isystembazel-bin/src/rust/python-parser/_virtual_includes/python-parser@cxx
 -isystembazel-bin/src/rust/net/_virtual_includes/net@cxx
 -isystembazel-bin/src/rust/transpiler/_virtual_includes/transpiler@cxx
+-isystembazel-bin/src/rust/api/_virtual_includes/lib.rs@cxx
+-isystembazel-bin/src/rust/jsg/_virtual_includes/modules.rs@cxx
 -D_FORTIFY_SOURCE=1
 -D_LIBCPP_REMOVE_TRANSITIVE_INCLUDES
 -D_LIBCPP_NO_ABI_TAG

justfile

@@ -15,6 +15,12 @@ prepare:
   cargo install gen-compile-commands watchexec-cli
   just create-external
   just compile-commands
+  just prepare-rust
+
+prepare-rust:
+  rustup install 1.90.0
+  rustup component add rust-analyzer
+  rustup update
 
 prepare-ubuntu:
   sudo apt-get install -y --no-install-recommends libc++abi1-19 libc++1-19 libc++-19-dev lld-19 bazelisk python3 lcov fd-find

src/rust/dns/BUILD.bazel → src/rust/api/BUILD.bazel

@@ -1,11 +1,12 @@
 load("//:build/wd_rust_crate.bzl", "wd_rust_crate")
 
 wd_rust_crate(
-    name = "dns",
-    cxx_bridge_src = "lib.rs",
+    name = "api",
+    cxx_bridge_deps = ["//src/rust/jsg"],
+    cxx_bridge_srcs = ["lib.rs"],
     visibility = ["//visibility:public"],
     deps = [
-        "//src/rust/cxx-integration",
+        "//src/rust/jsg",
         "@crates_vendor//:thiserror",
     ],
 )