use tcp client for raw connect.

@@ -119,9 +119,8 @@ SrsDynamicHttpConn::SrsDynamicHttpConn(IConnectionManager* cm, st_netfd_t fd, Sr
 {
     
     req = NULL;
-    io = NULL;
+    transport = new SrsTcpClient();
     client = NULL;
-    stfd = NULL;
     stream_id = 0;
     
     pprint = SrsPithyPrint::create_caster();
@@ -131,6 +130,7 @@ SrsDynamicHttpConn::~SrsDynamicHttpConn()
 {
     close();
     
+    srs_freep(transport);
     srs_freep(pprint);
 }
 
@@ -261,7 +261,7 @@ int SrsDynamicHttpConn::connect()
     
     // when ok, ignore.
     // TODO: FIXME: should reconnect when disconnected.
-    if (io || client) {
+    if (transport->connected()) {
         return ret;
     }
     
@@ -273,12 +273,10 @@ int SrsDynamicHttpConn::connect()
     }
     
     // connect host.
-    if ((ret = srs_socket_connect(req->host, req->port, ST_UTIME_NO_TIMEOUT, &stfd)) != ERROR_SUCCESS) {
-        srs_error("mpegts: connect server %s:%d failed. ret=%d", req->host.c_str(), req->port, ret);
+    if ((ret = transport->connect(req->host, req->port, ST_UTIME_NO_TIMEOUT)) != ERROR_SUCCESS) {
         return ret;
     }
-    io = new SrsStSocket(stfd);
-    client = new SrsRtmpClient(io);
+    client = new SrsRtmpClient(transport);
     
     client->set_recv_timeout(SRS_CONSTS_RTMP_RECV_TIMEOUT_US);
     client->set_send_timeout(SRS_CONSTS_RTMP_SEND_TIMEOUT_US);
@@ -360,10 +358,10 @@ int SrsDynamicHttpConn::connect_app(string ep_server, int ep_port)
 
 void SrsDynamicHttpConn::close()
 {
+    transport->close();
+    
     srs_freep(client);
-    srs_freep(io);
     srs_freep(req);
-    srs_close_stfd(stfd);
 }
 
 SrsHttpFileReader::SrsHttpFileReader(ISrsHttpResponseReader* h)

@@ -43,6 +43,7 @@ class SrsRequest;
 class SrsPithyPrint;
 class ISrsHttpResponseReader;
 class SrsFlvDecoder;
+class SrsTcpClient;
 
 #include <srs_app_st.hpp>
 #include <srs_app_listener.hpp>
@@ -86,8 +87,7 @@ private:
     SrsPithyPrint* pprint;
 private:
     SrsRequest* req;
-    st_netfd_t stfd;
-    SrsStSocket* io;
+    SrsTcpClient* transport;
     SrsRtmpClient* client;
     int stream_id;
 public:

@@ -28,6 +28,7 @@ using namespace std;
 
 #include <srs_kernel_error.hpp>
 #include <srs_kernel_log.hpp>
+#include <srs_app_utility.hpp>
 
 namespace internal
 {
@@ -411,18 +412,106 @@ int SrsStSocket::writev(const iovec *iov, int iov_size, ssize_t* nwrite)
 
 SrsTcpClient::SrsTcpClient()
 {
+    io = NULL;
+    stfd = NULL;
 }
 
 SrsTcpClient::~SrsTcpClient()
 {
+    close();
+}
+
+bool SrsTcpClient::connected()
+{
+    return io;
 }
 
 int SrsTcpClient::connect(string host, int port, int64_t timeout)
 {
     int ret = ERROR_SUCCESS;
+    
+    // when connected, ignore.
+    if (io) {
+        return ret;
+    }
+    
+    // connect host.
+    if ((ret = srs_socket_connect(host, port, timeout, &stfd)) != ERROR_SUCCESS) {
+        srs_error("mpegts: connect server %s:%d failed. ret=%d", host.c_str(), port, ret);
+        return ret;
+    }
+    
+    io = new SrsStSocket(stfd);
+    
     return ret;
 }
 
+void SrsTcpClient::close()
+{
+    // when closed, ignore.
+    if (!io) {
+        return;
+    }
+    
+    srs_freep(io);
+    srs_close_stfd(stfd);
+}
+
+bool SrsTcpClient::is_never_timeout(int64_t timeout_us)
+{
+    return io->is_never_timeout(timeout_us);
+}
+
+void SrsTcpClient::set_recv_timeout(int64_t timeout_us)
+{
+    io->set_recv_timeout(timeout_us);
+}
+
+int64_t SrsTcpClient::get_recv_timeout()
+{
+    return io->get_recv_timeout();
+}
+
+void SrsTcpClient::set_send_timeout(int64_t timeout_us)
+{
+    io->set_send_timeout(timeout_us);
+}
+
+int64_t SrsTcpClient::get_send_timeout()
+{
+    return io->get_send_timeout();
+}
+
+int64_t SrsTcpClient::get_recv_bytes()
+{
+    return io->get_recv_bytes();
+}
+
+int64_t SrsTcpClient::get_send_bytes()
+{
+    return io->get_send_bytes();
+}
+
+int SrsTcpClient::read(void* buf, size_t size, ssize_t* nread)
+{
+    return io->read(buf, size, nread);
+}
+
+int SrsTcpClient::read_fully(void* buf, size_t size, ssize_t* nread)
+{
+    return io->read_fully(buf, size, nread);
+}
+
+int SrsTcpClient::write(void* buf, size_t size, ssize_t* nwrite)
+{
+    return io->write(buf, size, nwrite);
+}
+
+int SrsTcpClient::writev(const iovec *iov, int iov_size, ssize_t* nwrite)
+{
+    return io->writev(iov, iov_size, nwrite);
+}
+
 #ifdef __linux__
 #include <sys/epoll.h>
 

@@ -208,19 +208,46 @@ public:
  * the common tcp client, to connect to specified TCP server,
  * reconnect and close the connection.
  */
-class SrsTcpClient
+class SrsTcpClient : public ISrsProtocolReaderWriter
 {
+private:
+    st_netfd_t stfd;
+    SrsStSocket* io;
 public:
     SrsTcpClient();
     virtual ~SrsTcpClient();
 public:
     /**
+     * whether connected to server.
+     */
+    virtual bool connected();
+public:
+    /**
      * connect to server over TCP.
      * @param host the ip or hostname of server.
      * @param port the port to connect to.
      * @param timeout the timeout in us.
+     * @remark ignore when connected.
      */
     virtual int connect(std::string host, int port, int64_t timeout);
+    /**
+     * close the connection.
+     * @remark ignore when closed.
+     */
+    virtual void close();
+// interface ISrsProtocolReaderWriter
+public:
+    virtual bool is_never_timeout(int64_t timeout_us);
+    virtual void set_recv_timeout(int64_t timeout_us);
+    virtual int64_t get_recv_timeout();
+    virtual void set_send_timeout(int64_t timeout_us);
+    virtual int64_t get_send_timeout();
+    virtual int64_t get_recv_bytes();
+    virtual int64_t get_send_bytes();
+    virtual int read(void* buf, size_t size, ssize_t* nread);
+    virtual int read_fully(void* buf, size_t size, ssize_t* nread);
+    virtual int write(void* buf, size_t size, ssize_t* nwrite);
+    virtual int writev(const iovec *iov, int iov_size, ssize_t* nwrite);
 };
 
 // initialize st, requires epoll.