Create RestApiError to stop vulnchainfinder when the REST API is unavailable

Author: mir-am

plugins/vulnerable-chain-finder/src/main/java/eu/f4sten/vulchainfinder/Main.java

@@ -24,6 +24,7 @@
 import eu.f4sten.infra.kafka.Message;
 import eu.f4sten.infra.kafka.MessageGenerator;
 import eu.f4sten.pomanalyzer.data.MavenId;
+import eu.f4sten.vulchainfinder.exceptions.RestApiError;
 import eu.f4sten.vulchainfinder.utils.DatabaseUtils;
 import eu.f4sten.vulchainfinder.utils.ImpactPropagator;
 import eu.f4sten.vulchainfinder.utils.RestAPIDependencyResolver;
@@ -151,6 +152,9 @@ public static MavenId extractMavenIdFrom(final Pom pom) {
     private void runOrPublishErr(final Runnable r) {
         try {
             r.run();
+        } catch (RestApiError e) {
+            LOG.error("Forced to stop the plug-in as the REST API is unavailable", e);
+            throw e;
         } catch (Exception e) {
             LOG.warn("Execution failed for input: {}", curId, e);
 

plugins/vulnerable-chain-finder/src/main/java/eu/f4sten/vulchainfinder/exceptions/RestApiError.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2022 Delft University of Technology
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package eu.f4sten.vulchainfinder.exceptions;
+
+/**
+ * A custom exception for Rest API-related exception to stop the plug-in's container. This error is unrecoverable.
+ */
+public class RestApiError extends Error {
+    public RestApiError(String errorMsg, Throwable err) {
+        super(errorMsg, err);
+    }
+}

plugins/vulnerable-chain-finder/src/main/java/eu/f4sten/vulchainfinder/utils/RestAPIDependencyResolver.java

@@ -1,6 +1,7 @@
 package eu.f4sten.vulchainfinder.utils;
 
 import eu.f4sten.pomanalyzer.data.MavenId;
+import eu.f4sten.vulchainfinder.exceptions.RestApiError;
 import eu.fasten.core.data.metadatadb.codegen.tables.Dependencies;
 import eu.fasten.core.data.metadatadb.codegen.tables.PackageVersions;
 import java.io.IOException;
@@ -83,7 +84,7 @@ public HttpResponse<String> sendOrThrow(final HttpRequest request) {
             exception = e;
         }
         if (exception != null || response == null || isNotOK(response)) {
-            throw new RuntimeException("Problem requesting Rest API.", exception);
+            throw new RestApiError("Problem requesting Rest API.", exception);
         }
 
         return response;