kafka refine comments.

@@ -99,6 +99,32 @@ std::string srs_kafka_summary_partitions(const vector<SrsKafkaPartition*>& parti
     return srs_join_vector_string(ret, ", ");
 }
 
+void srs_kafka_metadata2connector(SrsKafkaTopicMetadataResponse* metadata, vector<SrsKafkaPartition*>& partitions)
+{
+    for (int i = 0; i < metadata->metadatas.size(); i++) {
+        SrsKafkaTopicMetadata* topic = metadata->metadatas.at(i);
+        
+        for (int j = 0; j < topic->metadatas.size(); j++) {
+            SrsKafkaPartitionMetadata* partition = topic->metadatas.at(j);
+            
+            SrsKafkaPartition* p = new SrsKafkaPartition();
+            p->id = partition->partition_id;
+            p->broker = partition->leader;
+            
+            for (int i = 0; i < metadata->brokers.size(); i++) {
+                SrsKafkaBroker* broker = metadata->brokers.at(i);
+                if (broker->node_id == p->broker) {
+                    p->host = broker->host.to_str();
+                    p->port = broker->port;
+                    break;
+                }
+            }
+            
+            partitions.push_back(p);
+        }
+    }
+}
+
 SrsKafkaPartition::SrsKafkaPartition()
 {
     id = broker = 0;
@@ -120,7 +146,7 @@ string SrsKafkaPartition::hostport()
 
 SrsKafkaProducer::SrsKafkaProducer()
 {
-    meatadata_ok = false;
+    metadata_ok = false;
     metadata_expired = st_cond_new();
     
     lock = st_mutex_new();
@@ -156,7 +182,6 @@ int SrsKafkaProducer::initialize()
 {
     int ret = ERROR_SUCCESS;
     
-    meatadata_ok = false;
     srs_info("initialize kafka producer ok.");
     
     return ret;
@@ -175,9 +200,7 @@ int SrsKafkaProducer::start()
         srs_error("start kafka thread failed. ret=%d", ret);
     }
     
-    meatadata_ok = false;
-    st_cond_signal(metadata_expired);
-    srs_trace("kafka work in background");
+    refresh_metadata();
     
     return ret;
 }
@@ -203,7 +226,7 @@ int SrsKafkaProducer::on_before_cycle()
 {
     // wait for the metadata expired.
     // when metadata is ok, wait for it expired.
-    if (meatadata_ok) {
+    if (metadata_ok) {
         st_cond_wait(metadata_expired);
     }
     
@@ -291,34 +314,20 @@ int SrsKafkaProducer::request_metadata()
     srs_trace("kafka metadata: %s", summary.c_str());
     
     // generate the partition info.
-    for (int i = 0; i < metadata->metadatas.size(); i++) {
-        SrsKafkaTopicMetadata* topic = metadata->metadatas.at(i);
-        
-        for (int j = 0; j < topic->metadatas.size(); j++) {
-            SrsKafkaPartitionMetadata* partition = topic->metadatas.at(j);
-            
-            SrsKafkaPartition* p = new SrsKafkaPartition();
-            p->id = partition->partition_id;
-            p->broker = partition->leader;
-            
-            for (int i = 0; i < metadata->brokers.size(); i++) {
-                SrsKafkaBroker* broker = metadata->brokers.at(i);
-                if (broker->node_id == p->broker) {
-                    p->host = broker->host.to_str();
-                    p->port = broker->port;
-                    break;
-                }
-            }
-            
-            partitions.push_back(p);
-        }
-    }
+    srs_kafka_metadata2connector(metadata, partitions);
     srs_trace("kafka connector: %s", srs_kafka_summary_partitions(partitions).c_str());
     
-    meatadata_ok = true;
+    metadata_ok = true;
     
     return ret;
 }
 
+void SrsKafkaProducer::refresh_metadata()
+{
+    metadata_ok = false;
+    st_cond_signal(metadata_expired);
+    srs_trace("kafka async refresh metadata in background");
+}
+
 #endif
 

@@ -69,7 +69,7 @@ private:
     st_mutex_t lock;
     SrsReusableThread* pthread;
 private:
-    bool meatadata_ok;
+    bool metadata_ok;
     st_cond_t metadata_expired;
 public:
     std::vector<SrsKafkaPartition*> partitions;
@@ -93,6 +93,8 @@ public:
 private:
     virtual int do_cycle();
     virtual int request_metadata();
+    // set the metadata to invalid and refresh it.
+    virtual void refresh_metadata();
 };
 
 #endif

@@ -1010,7 +1010,7 @@ int SrsKafkaProtocol::recv_message(SrsKafkaResponse** pmsg)
         // fetch cached api key.
         SrsKafkaCorrelationPool* pool = SrsKafkaCorrelationPool::instance();
         SrsKafkaApiKey key = pool->unset(header.correlation_id());
-        srs_trace("kafka got %d bytes response, key=%d", header.total_size(), header.correlation_id());
+        srs_info("kafka got %d bytes response, key=%d", header.total_size(), header.correlation_id());
         
         // create message by cached api key.
         SrsKafkaResponse* res = NULL;