support specifying fe protocol

Author: Vladimír Dudr

flink-doris-connector/src/main/java/org/apache/doris/flink/rest/RestService.java

@@ -91,8 +91,8 @@ public class RestService implements Serializable {
     private static final String BACKENDS_V2 = "/api/backends?is_alive=true";
     private static final String FE_LOGIN = "/rest/v1/login";
     private static final ObjectMapper objectMapper = new ObjectMapper();
-    private static final String TABLE_SCHEMA_API = "http://%s/api/%s/%s/_schema";
-    private static final String QUERY_PLAN_API = "http://%s/api/%s/%s/_query_plan";
+    private static final String TABLE_SCHEMA_API = "%s/api/%s/%s/_schema";
+    private static final String QUERY_PLAN_API = "%s/api/%s/%s/_query_plan";
 
     /**
      * send request to Doris FE and get response json string.
@@ -131,6 +131,7 @@ private static String send(
                 RequestConfig.custom()
                         .setConnectTimeout(connectTimeout)
                         .setSocketTimeout(socketTimeout)
+                        .setRedirectsEnabled(true)
                         .build();
 
         request.setConfig(requestConfig);
@@ -310,6 +311,9 @@ public static String randomEndpoint(String feNodes, Logger logger)
         Collections.shuffle(nodes);
         for (String feNode : nodes) {
             String host = feNode.trim();
+            if (!host.startsWith("http://") && !host.startsWith("https://")) {
+                host = "http://" + host;
+            }
             if (BackendUtil.tryHttpConnection(host)) {
                 return host;
             }
@@ -359,7 +363,11 @@ public static List<BackendRowV2> getBackendsV2(
 
         for (String feNode : feNodeList) {
             try {
-                String beUrl = "http://" + feNode + BACKENDS_V2;
+                if (!feNode.startsWith("http://") && !feNode.startsWith("https://")) {
+                    feNode = "http://" + feNode;
+                }
+                String beUrl = feNode + BACKENDS_V2;
+                logger.warn("---------------- URL set: {}", beUrl);
                 HttpGet httpGet = new HttpGet(beUrl);
                 String response = send(options, readOptions, httpGet, logger);
                 logger.info("Backend Info:{}", response);

flink-doris-connector/src/main/java/org/apache/doris/flink/sink/BackendUtil.java

@@ -98,8 +98,10 @@ public String getAvailableBackend(int subtaskId) {
 
     public static boolean tryHttpConnection(String host) {
         try {
+            if (!host.startsWith("http://") && !host.startsWith("https://")) {
+                host = "http://" + host;
+            }
             LOG.debug("try to connect host {}", host);
-            host = "http://" + host;
             URL url = new URL(host);
             HttpURLConnection connection = (HttpURLConnection) url.openConnection();
             connection.setRequestMethod("GET");

flink-doris-connector/src/main/java/org/apache/doris/flink/sink/schema/SchemaChangeManager.java

@@ -58,7 +58,7 @@ public class SchemaChangeManager implements Serializable {
     private static final Logger LOG = LoggerFactory.getLogger(SchemaChangeManager.class);
     private static final String CHECK_SCHEMA_CHANGE_API =
             "http://%s/api/enable_light_schema_change/%s/%s";
-    private static final String SCHEMA_CHANGE_API = "http://%s/api/query/default_cluster/%s";
+    private static final String SCHEMA_CHANGE_API = "%s/api/query/default_cluster/%s";
     private ObjectMapper objectMapper = new ObjectMapper();
     private DorisOptions dorisOptions;
     private String charsetEncoding = "UTF-8";

flink-doris-connector/src/test/java/org/apache/doris/flink/rest/TestRestService.java

@@ -122,12 +122,12 @@ public void testParseIdentifierIllegal() throws Exception {
 
     @Test
     public void testChoiceFe() throws Exception {
-        String validFes = "1,2,3";
+        String validFes = "1,http://2,https://3";
         String fe = RestService.randomEndpoint(validFes, logger);
         List<String> feNodes = new ArrayList<>(3);
-        feNodes.add("1");
-        feNodes.add("2");
-        feNodes.add("3");
+        feNodes.add("http://1");
+        feNodes.add("http://2");
+        feNodes.add("https://3");
         Assert.assertTrue(feNodes.contains(fe));
 
         String emptyFes = "";
@@ -416,7 +416,7 @@ public void testParseBackendV2Error() throws Exception {
     public void testGetBackendsV2() {
         DorisOptions options =
                 DorisOptions.builder()
-                        .setFenodes("127.0.0.1:1,127.0.0.1:2")
+                        .setFenodes("https://127.0.0.1:1,http://127.0.0.1:2,127.0.0.1:3")
                         .setAutoRedirect(false)
                         .build();
         DorisReadOptions readOptions = DorisReadOptions.defaults();