fix(go-feature-flag): fix loading wasm files in a jar mode. (#1595)

Signed-off-by: Thomas Poignant <thomas.poignant@gofeatureflag.org>

Author: thomaspoignant

providers/go-feature-flag/download-wasm.sh

@@ -2,4 +2,4 @@
 
 # This script copy the wasm module from the git submodule repository and adds it to the build.
 wasm_version="v1.45.4" # {{wasm_version}}
-mv ./wasm-releases/evaluation/gofeatureflag-evaluation_$wasm_version.wasi ./src/main/resources/wasm/gofeatureflag-evaluation_$wasm_version.wasi
+cp ./wasm-releases/evaluation/gofeatureflag-evaluation_$wasm_version.wasi ./src/main/resources/wasm/gofeatureflag-evaluation.wasi

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

@@ -16,12 +16,8 @@
 import dev.openfeature.contrib.providers.gofeatureflag.wasm.bean.WasmInput;
 import dev.openfeature.sdk.ErrorCode;
 import dev.openfeature.sdk.Reason;
-import java.io.File;
-import java.net.URL;
+import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.util.Collections;
 import lombok.val;
 
@@ -58,27 +54,21 @@ public EvaluationWasm() throws WasmFileNotFound {
     /**
      * 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 File getWasmFile() throws WasmFileNotFound {
+    private InputStream getWasmFile() throws WasmFileNotFound {
         try {
-            ClassLoader classLoader = EvaluationWasm.class.getClassLoader();
-            URL directoryUrl = classLoader.getResource("wasm");
-            if (directoryUrl == null) {
-                throw new RuntimeException("Directory not found");
-            }
-            Path dirPath = Paths.get(directoryUrl.toURI());
-            try (val files = Files.list(dirPath)) {
-                return files.filter(path -> path.getFileName().toString().startsWith("gofeatureflag-evaluation")
-                                && (path.getFileName().toString().endsWith(".wasi")
-                                        || path.getFileName().toString().endsWith(".wasm")))
-                        .findFirst()
-                        .map(Path::toFile)
-                        .orElseThrow(
-                                () -> new RuntimeException("No file starting with 'gofeatureflag-evaluation' found"));
+            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);
         }