add function to convert kafka array to vector

@@ -34,6 +34,7 @@ using namespace std;
 #include <srs_kernel_utility.hpp>
 #include <srs_kernel_balance.hpp>
 #include <srs_kafka_stack.hpp>
+#include <srs_core_autofree.hpp>
 
 #ifdef SRS_AUTO_KAFKA
 
@@ -178,6 +179,14 @@ int SrsKafkaProducer::request_metadata()
         srs_parse_endpoint(broker, server, port);
     }
     
+    std::string topic = _srs_config->get_kafka_topic();
+    if (true) {
+        std::string senabled = srs_bool2switch(enabled);
+        std::string sbrokers = srs_join_vector_string(brokers->args, ",");
+        srs_trace("kafka request enabled:%s, brokers:%s, current:[%d]%s:%d, topic:%s",
+                  senabled.c_str(), sbrokers.c_str(), lb->current(), server.c_str(), port, topic.c_str());
+    }
+    
     // connect to kafka server.
     if ((ret = transport->connect(server, port, SRS_CONSTS_KAFKA_TIMEOUT_US)) != ERROR_SUCCESS) {
         srs_error("kafka connect %s:%d failed. ret=%d", server.c_str(), port, ret);
@@ -185,19 +194,12 @@ int SrsKafkaProducer::request_metadata()
     }
     
     // do fetch medata from broker.
-    std::string topic = _srs_config->get_kafka_topic();
-    if ((ret = kafka->fetch_metadata(topic)) != ERROR_SUCCESS) {
+    SrsKafkaTopicMetadataResponse* metadata = NULL;
+    if ((ret = kafka->fetch_metadata(topic, &metadata)) != ERROR_SUCCESS) {
         srs_error("kafka fetch metadata failed. ret=%d", ret);
         return ret;
     }
-    
-    // log when completed.
-    if (true) {
-        std::string senabled = srs_bool2switch(enabled);
-        std::string sbrokers = srs_join_vector_string(brokers->args, ",");
-        srs_trace("kafka ok, enabled:%s, brokers:%s, current:[%d]%s:%d, topic:%s",
-                  senabled.c_str(), sbrokers.c_str(), lb->current(), server.c_str(), port, topic.c_str());
-    }
+    SrsAutoFree(SrsKafkaTopicMetadataResponse, metadata);
     
     meatadata_ok = true;
     

@@ -1051,8 +1051,10 @@ SrsKafkaClient::~SrsKafkaClient()
     srs_freep(protocol);
 }
 
-int SrsKafkaClient::fetch_metadata(string topic)
+int SrsKafkaClient::fetch_metadata(string topic, SrsKafkaTopicMetadataResponse** pmsg)
 {
+    *pmsg = NULL;
+    
     int ret = ERROR_SUCCESS;
     
     SrsKafkaTopicMetadataRequest* req = new SrsKafkaTopicMetadataRequest();
@@ -1064,17 +1066,21 @@ int SrsKafkaClient::fetch_metadata(string topic)
         return ret;
     }
     
-    SrsKafkaResponse* res = NULL;
-    if ((ret = protocol->recv_message(&res)) != ERROR_SUCCESS) {
+    if ((ret = protocol->expect_message(pmsg)) != ERROR_SUCCESS) {
         srs_error("kafka recv response failed. ret=%d", ret);
         return ret;
     }
-    SrsAutoFree(SrsKafkaResponse, res);
-    
-    // TODO: FIXME: implements it.
     
     return ret;
 }
 
+vector<string> srs_kafka_array2vector(SrsKafkaArray<SrsKafkaString>* arr)
+{
+    vector<string> strs;
+    for (int i = 0; i < arr->size(); i++) {
+    }
+    return strs;
+}
+
 #endif
 

@@ -666,7 +666,7 @@ public:
  */
 class SrsKafkaTopicMetadataResponse : public SrsKafkaResponse
 {
-private:
+public:
     SrsKafkaArray<SrsKafkaBroker> brokers;
     SrsKafkaArray<SrsKafkaTopicMetadata> metadatas;
 public:
@@ -741,6 +741,36 @@ public:
      * @param pmsg output the received message. user must free it.
      */
     virtual int recv_message(SrsKafkaResponse** pmsg);
+public:
+    /**
+     * expect specified message.
+     */
+    template<typename T>
+    int expect_message(T** pmsg)
+    {
+        int ret = ERROR_SUCCESS;
+        
+        while (true) {
+            SrsKafkaResponse* res = NULL;
+            if ((ret = recv_message(&res)) != ERROR_SUCCESS) {
+                srs_error("recv response failed. ret=%d", ret);
+                return ret;
+            }
+            
+            // drop not matched.
+            T* msg = dynamic_cast<T*>(res);
+            if (!msg) {
+                srs_info("kafka drop response.");
+                srs_freep(res);
+                continue;
+            }
+            
+            *pmsg = msg;
+            break;
+        }
+        
+        return ret;
+    }
 };
 
 /**
@@ -757,9 +787,12 @@ public:
     /**
      * fetch the metadata from broker for topic.
      */
-    virtual int fetch_metadata(std::string topic);
+    virtual int fetch_metadata(std::string topic, SrsKafkaTopicMetadataResponse** pmsg);
 };
 
+// convert kafka array[string] to vector[string]
+extern std::vector<std::string> srs_kafka_array2vector(SrsKafkaArray<SrsKafkaString>* arr);
+
 #endif
 
 #endif

@@ -997,7 +997,7 @@ public:
      * for example:
      *          SrsCommonMessage* msg = NULL;
      *          SrsConnectAppResPacket* pkt = NULL;
-     *          if ((ret = server->expect_message<SrsConnectAppResPacket>(protocol, &msg, &pkt)) != ERROR_SUCCESS) {
+     *          if ((ret = server->expect_message<SrsConnectAppResPacket>(&msg, &pkt)) != ERROR_SUCCESS) {
      *              return ret;
      *          }
      *          // use then free msg and pkt