feat: compile go-feature-flag to Java bytecode

Signed-off-by: andreatp <[email protected]>

Author: andreaTP

providers/go-feature-flag/pom.xml

@@ -19,6 +19,8 @@
     <properties>
         <!-- override module name defined in parent ("-" is not allowed) -->
         <module-name>${groupId}.gofeatureflag</module-name>
+
+        <wasm.version>v1.45.4</wasm.version>
     </properties>
 
     <developers>
@@ -74,16 +76,10 @@
             <scope>test</scope>
         </dependency>
 
-        <dependency>
-            <groupId>com.dylibso.chicory</groupId>
-            <artifactId>runtime</artifactId>
-            <version>1.5.0</version>
-        </dependency>
-
         <dependency>
             <groupId>com.dylibso.chicory</groupId>
             <artifactId>wasi</artifactId>
-            <version>1.5.0</version>
+            <version>1.6.0</version>
         </dependency>
 
         <dependency>
@@ -117,20 +113,18 @@
     <build>
         <plugins>
             <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>exec-maven-plugin</artifactId>
+                <groupId>com.dylibso.chicory</groupId>
+                <artifactId>chicory-compiler-maven-plugin</artifactId>
+                <version>1.6.0</version>
                 <executions>
                     <execution>
-                        <id>download-latest-github-asset</id>
-                        <phase>generate-resources</phase>
+                        <id>gofeatureflag</id>
                         <goals>
-                            <goal>exec</goal>
+                            <goal>compile</goal>
                         </goals>
                         <configuration>
-                            <executable>bash</executable>
-                            <arguments>
-                                <argument>${project.basedir}/download-wasm.sh</argument>
-                            </arguments>
+                            <name>dev.openfeature.contrib.providers.gofeatureflag.wasm.Module</name>
+                            <wasmFile>wasm-releases/evaluation/gofeatureflag-evaluation_${wasm.version}.wasi</wasmFile>
                         </configuration>
                     </execution>
                 </executions>

providers/go-feature-flag/src/main/java/dev/openfeature/contrib/providers/gofeatureflag/wasm/EvaluationWasm.java

@@ -1,24 +1,27 @@
 package dev.openfeature.contrib.providers.gofeatureflag.wasm;
 
+import com.dylibso.chicory.runtime.ByteArrayMemory;
 import com.dylibso.chicory.runtime.ExportFunction;
 import com.dylibso.chicory.runtime.HostFunction;
+import com.dylibso.chicory.runtime.ImportFunction;
+import com.dylibso.chicory.runtime.ImportValues;
 import com.dylibso.chicory.runtime.Instance;
 import com.dylibso.chicory.runtime.Memory;
-import com.dylibso.chicory.runtime.Store;
 import com.dylibso.chicory.wasi.WasiExitException;
 import com.dylibso.chicory.wasi.WasiOptions;
 import com.dylibso.chicory.wasi.WasiPreview1;
-import com.dylibso.chicory.wasm.Parser;
 import com.dylibso.chicory.wasm.types.ValueType;
 import dev.openfeature.contrib.providers.gofeatureflag.bean.GoFeatureFlagResponse;
 import dev.openfeature.contrib.providers.gofeatureflag.exception.WasmFileNotFound;
 import dev.openfeature.contrib.providers.gofeatureflag.util.Const;
 import dev.openfeature.contrib.providers.gofeatureflag.wasm.bean.WasmInput;
 import dev.openfeature.sdk.ErrorCode;
 import dev.openfeature.sdk.Reason;
-import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
 import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
 import lombok.val;
 
 /**
@@ -42,36 +45,21 @@ public EvaluationWasm() throws WasmFileNotFound {
         val wasi = WasiPreview1.builder()
                 .withOptions(WasiOptions.builder().inheritSystem().build())
                 .build();
-        val hostFunctions = wasi.toHostFunctions();
-        val store = new Store().addFunction(hostFunctions);
-        store.addFunction(getProcExitFunc());
-        this.instance = store.instantiate("evaluation", Parser.parse(getWasmFile()));
+        List<ImportFunction> hostFunctions =
+                Arrays.stream(wasi.toHostFunctions()).map(this::replaceProcExit).collect(Collectors.toList());
+        this.instance = Instance.builder(Module.load())
+                .withMemoryFactory(ByteArrayMemory::new)
+                .withMachineFactory(Module::create)
+                .withImportValues(
+                        ImportValues.builder().withFunctions(hostFunctions).build())
+                .build();
         this.evaluate = this.instance.export("evaluate");
         this.malloc = this.instance.export("malloc");
         this.free = this.instance.export("free");
     }
 
-    /**
-     * getWasmFile is a function that returns the path to the WASM file.
-     * It looks for the file in the classpath under the directory "wasm".
-     * This method handles both file system resources and JAR-packaged resources.
-     *
-     * @return the path to the WASM file
-     * @throws WasmFileNotFound - if the file is not found
-     */
-    private InputStream getWasmFile() throws WasmFileNotFound {
-        try {
-            final String wasmResourcePath = "wasm/gofeatureflag-evaluation.wasi";
-            InputStream inputStream = EvaluationWasm.class.getClassLoader().getResourceAsStream(wasmResourcePath);
-            if (inputStream == null) {
-                throw new WasmFileNotFound("WASM resource not found in classpath: " + wasmResourcePath);
-            }
-            return inputStream;
-        } catch (WasmFileNotFound e) {
-            throw e;
-        } catch (Exception e) {
-            throw new WasmFileNotFound(e);
-        }
+    private ImportFunction replaceProcExit(HostFunction hf) {
+        return hf.name().equals("proc_exit") ? getProcExitFunc() : hf;
     }
 
     /**
@@ -81,7 +69,7 @@ private InputStream getWasmFile() throws WasmFileNotFound {
      *
      * @return a HostFunction that is called when the WASM module calls proc_exit
      */
-    private HostFunction getProcExitFunc() {
+    private ImportFunction getProcExitFunc() {
         return new HostFunction(
                 "wasi_snapshot_preview1",
                 "proc_exit",

providers/go-feature-flag/src/main/resources/wasm/gofeatureflag-evaluation.wasi

@@ -17,6 +17,18 @@
         <Bug pattern="PREDICTABLE_RANDOM" />
     </Match>
 
+    <!-- Suppress: EI_EXPOSE_REP2 in ModuleMachine -->
+    <Match>
+        <Class name="dev.openfeature.contrib.providers.gofeatureflag.wasm.ModuleMachine"/>
+        <Bug pattern="EI_EXPOSE_REP2"/>
+    </Match>
+
+    <!-- Suppress: SKIPPED_CLASS_TOO_BIG in ModuleMachineFuncGroup_0 -->
+    <Match>
+        <Class name="dev.openfeature.contrib.providers.gofeatureflag.wasm.ModuleMachineFuncGroup_0"/>
+        <Bug pattern="SKIPPED_CLASS_TOO_BIG"/>
+    </Match>
+
     <!-- All bugs in test classes, except for JUnit-specific bugs -->
     <Match>
         <Class name="~.*\.*Test" />