Allow setting default topic config

src/configuration.cpp

@@ -6,6 +6,9 @@
 #include "consumer.h"
 
 using std::string;
+using std::move;
+
+using boost::optional;
 
 using std::chrono::milliseconds;
 
@@ -135,6 +138,10 @@ void Configuration::set_socket_callback(SocketCallback callback) {
     rd_kafka_conf_set_socket_cb(handle_.get(), &socket_callback_proxy);
 }
 
+void Configuration::set_default_topic_configuration(optional<TopicConfiguration> config) {
+    default_topic_config_ = move(config);
+}
+
 rd_kafka_conf_t* Configuration::get_handle() const {
     return handle_.get();
 }
@@ -167,6 +174,14 @@ const Configuration::SocketCallback& Configuration::get_socket_callback() const
     return socket_callback_;
 }
 
+const optional<TopicConfiguration>& Configuration::get_default_topic_configuration() const {
+    return default_topic_config_;
+}
+
+optional<TopicConfiguration>& Configuration::get_default_topic_configuration() {
+    return default_topic_config_;
+}
+
 Configuration::HandlePtr Configuration::make_handle(rd_kafka_conf_t* ptr) {
     return HandlePtr(ptr, &rd_kafka_conf_destroy, &rd_kafka_conf_dup);
 }     

src/kafka_handle_base.cpp

@@ -16,12 +16,12 @@ const milliseconds KafkaHandleBase::DEFAULT_TIMEOUT{1000};
 
 KafkaHandleBase::KafkaHandleBase(Configuration config) 
 : handle_(nullptr, nullptr), timeout_ms_(DEFAULT_TIMEOUT), config_(move(config)) {
-
-}
-
-KafkaHandleBase::KafkaHandleBase(rd_kafka_t* handle) 
-: handle_(handle, &rd_kafka_destroy), timeout_ms_(DEFAULT_TIMEOUT) {
-
+    auto& maybe_config = config_.get_default_topic_configuration();
+    if (maybe_config) {
+        maybe_config->set_as_opaque();
+        auto conf_handle = rd_kafka_topic_conf_dup(maybe_config->get_handle());
+        rd_kafka_conf_set_default_topic_conf(config_.get_handle(), conf_handle);
+    }
 }
 
 void KafkaHandleBase::pause_partitions(const TopicPartitionList& topic_partitions) {