[webcrawler] Do not fail in case of unknown properties in the JSON file (handle backward compatibility)

langstream-agents/langstream-agent-webcrawler/src/main/java/ai/langstream/agents/webcrawler/WebCrawlerSource.java

@@ -57,6 +57,7 @@
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.atomic.AtomicInteger;
+import lombok.Getter;
 import lombok.extern.slf4j.Slf4j;
 
 @Slf4j
@@ -74,7 +75,7 @@ public class WebCrawlerSource extends AbstractAgentCode implements AgentSource {
     private MinioClient minioClient;
     private int reindexIntervalSeconds;
 
-    private String statusFileName;
+    @Getter private String statusFileName;
 
     private WebCrawler crawler;
 
@@ -394,7 +395,12 @@ public Status getCurrentStatus() throws Exception {
                                         .build());
                 byte[] content = result.readAllBytes();
                 log.info("Restoring status from {}, {} bytes", statusFileName, content.length);
-                return MAPPER.readValue(content, Status.class);
+                try {
+                    return MAPPER.readValue(content, Status.class);
+                } catch (IOException e) {
+                    log.error("Error parsing status file, restarting from scratch", e);
+                    return null;
+                }
             } catch (ErrorResponseException e) {
                 if (e.errorResponse().code().equals("NoSuchKey")) {
                     log.info("No status file found, starting from scratch");

langstream-agents/langstream-agent-webcrawler/src/test/java/ai/langstream/agents/webcrawler/WebCrawlerSourceTest.java

@@ -36,7 +36,11 @@
 import ai.langstream.api.runner.topics.TopicProducer;
 import com.github.tomakehurst.wiremock.junit5.WireMockRuntimeInfo;
 import com.github.tomakehurst.wiremock.junit5.WireMockTest;
+import io.minio.MakeBucketArgs;
 import io.minio.MinioClient;
+import io.minio.PutObjectArgs;
+import java.io.ByteArrayInputStream;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -422,4 +426,45 @@ public Path getCodeDirectory() {
         agentSource.start();
         return (WebCrawlerSource) agentSource;
     }
+
+    @Test
+    void testRecoverFromWrongJsonFile() throws Exception {
+        String bucket = "langstream-test-" + UUID.randomUUID();
+        String url = "https://www.datastax.com/";
+        String allowed = "https://www.datastax.com/";
+
+        String objectName = "test-global-agent-id.webcrawler.status.json";
+        String json =
+                """
+                {
+                    "some-field": "some-value"
+                }
+                """;
+        minioClient.makeBucket(MakeBucketArgs.builder().bucket(bucket).build());
+        minioClient.putObject(
+                PutObjectArgs.builder()
+                        .bucket(bucket)
+                        .contentType("application/json")
+                        .object(objectName)
+                        .stream(
+                                new ByteArrayInputStream(json.getBytes(StandardCharsets.UTF_8)),
+                                json.length(),
+                                5 * 1024 * 1024)
+                        .build());
+        WebCrawlerSource agentSource =
+                buildAgentSource(
+                        bucket,
+                        allowed,
+                        Set.of(),
+                        url,
+                        Map.of(
+                                "reindex-interval-seconds",
+                                "3600",
+                                "scan-html-documents",
+                                "false",
+                                "max-urls",
+                                10000));
+        assertEquals(objectName, agentSource.getStatusFileName());
+        agentSource.close();
+    }
 }