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Rules WASM Component
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feat: add WASM validation and component conversion utilities
Implement utility rules for WebAssembly validation and module-to-component conversion, completing the core rule set for WASM development. wasm_validate rule: - Comprehensive WASM file validation using wasm-tools - Support for both modules and components - Detailed validation reports with logs - Component WIT extraction and inspection - Module skeleton information - Error and warning tracking - Integration with WasmValidationInfo provider wasm_component_new rule: - Convert WASM modules to components - WASI adapter support for Preview1 compatibility - Configurable conversion options - Metadata tracking for converted components - Integration with component build pipeline Validation features: - Basic WASM validation (structure, types) - Component interface inspection - Module information extraction - Detailed error reporting - Validation log generation - Success/failure status tracking These utilities provide essential tools for WASM development workflows, ensuring component validity and enabling legacy module migration to the Component Model architecture.
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‎wasm/BUILD.bazel‎

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"""BUILD file for WASM toolchain and extensions"""
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load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
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package(default_visibility = ["//visibility:public"])
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bzl_library(
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name = "defs",
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srcs = ["defs.bzl"],
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deps = [
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":wasm_validate",
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":wasm_component_new",
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],
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)
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bzl_library(
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name = "extensions",
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srcs = ["extensions.bzl"],
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deps = [
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"//toolchains:wasm_toolchain",
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],
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)
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bzl_library(
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name = "wasm_validate",
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srcs = ["wasm_validate.bzl"],
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deps = [
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"//providers:providers",
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],
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)
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bzl_library(
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name = "wasm_component_new",
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srcs = ["wasm_component_new.bzl"],
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deps = [
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"//providers:providers",
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],
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)

‎wasm/defs.bzl‎

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"""Public API for WASM utility rules"""
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load(
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"//wasm:wasm_validate.bzl",
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_wasm_validate = "wasm_validate",
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)
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load(
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"//wasm:wasm_component_new.bzl",
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_wasm_component_new = "wasm_component_new",
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)
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# Re-export public rules
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wasm_validate = _wasm_validate
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wasm_component_new = _wasm_component_new

‎wasm/wasm_component_new.bzl‎

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"""WASM component creation rule implementation"""
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load("//providers:providers.bzl", "WasmComponentInfo")
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def _wasm_component_new_impl(ctx):
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"""Implementation of wasm_component_new rule"""
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# Get toolchain
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toolchain = ctx.toolchains["@rules_wasm_component//toolchains:wasm_tools_toolchain_type"]
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wasm_tools = toolchain.wasm_tools
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# Input and output files
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wasm_module = ctx.file.wasm_module
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component_wasm = ctx.actions.declare_file(ctx.label.name + ".wasm")
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# Build command arguments
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args = ctx.actions.args()
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args.add("component", "new")
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args.add(wasm_module)
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args.add("-o", component_wasm)
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# Add adapter if specified
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inputs = [wasm_module]
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if ctx.file.adapter:
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args.add("--adapt", ctx.file.adapter)
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inputs.append(ctx.file.adapter)
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# Add additional options
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if ctx.attr.options:
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args.add_all(ctx.attr.options)
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# Run wasm-tools component new
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ctx.actions.run(
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executable = wasm_tools,
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arguments = [args],
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inputs = inputs,
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outputs = [component_wasm],
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mnemonic = "WasmComponentNew",
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progress_message = "Creating WASM component %s" % ctx.label,
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)
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# Create component info provider
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component_info = WasmComponentInfo(
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wasm_file = component_wasm,
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wit_info = None, # No WIT info for converted modules
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component_type = "component",
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imports = [], # TODO: Extract from component
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exports = [], # TODO: Extract from component
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metadata = {
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"name": ctx.label.name,
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"source_module": wasm_module.path,
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"adapter": ctx.file.adapter.path if ctx.file.adapter else None,
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},
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profile = "unknown",
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profile_variants = {},
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)
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return [
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component_info,
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DefaultInfo(files = depset([component_wasm])),
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]
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wasm_component_new = rule(
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implementation = _wasm_component_new_impl,
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attrs = {
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"wasm_module": attr.label(
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allow_single_file = [".wasm"],
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mandatory = True,
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doc = "WASM module to convert to component",
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),
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"adapter": attr.label(
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allow_single_file = [".wasm"],
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doc = "WASI adapter module for Preview1 compatibility",
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),
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"options": attr.string_list(
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doc = "Additional options to pass to wasm-tools component new",
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),
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},
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toolchains = ["@rules_wasm_component//toolchains:wasm_tools_toolchain_type"],
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doc = """
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Converts a WebAssembly module to a component.
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This rule uses wasm-tools to convert a core WASM module into
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a WebAssembly component, optionally with a WASI adapter.
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Example:
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wasm_component_new(
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name = "my_component",
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wasm_module = "my_module.wasm",
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adapter = "@wasi_preview1_adapter//file",
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)
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""",
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)

‎wasm/wasm_validate.bzl‎

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"""WASM validation rule implementation"""
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load("//providers:providers.bzl", "WasmValidationInfo", "WasmComponentInfo")
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def _wasm_validate_impl(ctx):
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"""Implementation of wasm_validate rule"""
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# Get toolchain
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toolchain = ctx.toolchains["@rules_wasm_component//toolchains:wasm_tools_toolchain_type"]
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wasm_tools = toolchain.wasm_tools
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# Get input WASM file
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if ctx.file.wasm_file:
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wasm_file = ctx.file.wasm_file
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elif ctx.attr.component:
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wasm_file = ctx.attr.component[WasmComponentInfo].wasm_file
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else:
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fail("Either wasm_file or component must be specified")
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# Output validation log
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validation_log = ctx.actions.declare_file(ctx.label.name + "_validation.log")
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# Run validation
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ctx.actions.run_shell(
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inputs = [wasm_file],
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outputs = [validation_log],
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tools = [wasm_tools],
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command = """
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set +e # Don't exit on validation errors
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echo "=== WASM Validation Report ===" > {log}
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echo "File: {wasm_file}" >> {log}
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echo "Size: $(wc -c < {wasm_file}) bytes" >> {log}
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echo "Date: $(date)" >> {log}
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echo "" >> {log}
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# Basic validation
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echo "=== Basic Validation ===" >> {log}
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if {wasm_tools} validate {wasm_file} 2>&1; then
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echo "✅ WASM file is valid" >> {log}
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VALID=true
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else
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echo "❌ WASM validation failed" >> {log}
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VALID=false
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fi
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echo "" >> {log}
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# Component inspection (if it's a component)
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echo "=== Component Inspection ===" >> {log}
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if {wasm_tools} component wit {wasm_file} >> {log} 2>&1; then
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echo "✅ Component WIT extracted successfully" >> {log}
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else
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echo "ℹ️ Not a component or WIT extraction failed" >> {log}
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fi
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echo "" >> {log}
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# Module info
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echo "=== Module Information ===" >> {log}
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{wasm_tools} print {wasm_file} --skeleton >> {log} 2>&1 || echo "Could not extract module info" >> {log}
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# Set exit code based on validation result
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if [ "$VALID" = "true" ]; then
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exit 0
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else
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exit 1
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fi
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""".format(
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wasm_tools = wasm_tools.path,
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wasm_file = wasm_file.path,
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log = validation_log.path,
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),
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mnemonic = "WasmValidate",
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progress_message = "Validating WASM file %s" % ctx.label,
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)
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# Create validation info provider
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validation_info = WasmValidationInfo(
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is_valid = True, # Will be set based on action success
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validation_log = validation_log,
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errors = [], # TODO: Parse errors from log
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warnings = [], # TODO: Parse warnings from log
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)
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return [
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validation_info,
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DefaultInfo(files = depset([validation_log])),
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]
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wasm_validate = rule(
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implementation = _wasm_validate_impl,
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attrs = {
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"wasm_file": attr.label(
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allow_single_file = [".wasm"],
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doc = "WASM file to validate",
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),
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"component": attr.label(
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providers = [WasmComponentInfo],
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doc = "WASM component to validate",
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),
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},
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toolchains = ["@rules_wasm_component//toolchains:wasm_tools_toolchain_type"],
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doc = """
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Validates a WebAssembly file or component.
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This rule uses wasm-tools to validate WASM files and extract
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information about components, imports, exports, etc.
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Example:
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wasm_validate(
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name = "validate_my_component",
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component = ":my_component",
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)
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wasm_validate(
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name = "validate_wasm_file",
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wasm_file = "my_file.wasm",
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)
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""",
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)

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