refine the colorful log for srs. remove the log when client close.

@@ -197,7 +197,9 @@ int SrsClient::service_cycle()
 		
 		// when not system control error, fatal error, return.
 		if (!srs_is_system_control_error(ret)) {
+		    if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 			    srs_error("stream service cycle failed. ret=%d", ret);
+		    }
 			return ret;
 		}
 		
@@ -409,7 +411,9 @@ int SrsClient::playing(SrsSource* source)
 			
 			srs_verbose("play loop recv message. ret=%d", ret);
 			if (ret != ERROR_SUCCESS && ret != ERROR_SOCKET_TIMEOUT) {
+			    if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 				    srs_error("recv client control message failed. ret=%d", ret);
+			    }
 				return ret;
 			}
 			if ((ret = process_play_control_msg(consumer, msg)) != ERROR_SUCCESS) {

@@ -63,7 +63,7 @@ void SrsConnection::cycle()
 	ret = do_cycle();
 	
 	// if socket io error, set to closed.
-	if (ret == ERROR_SOCKET_READ || ret == ERROR_SOCKET_READ_FULLY || ret == ERROR_SOCKET_WRITE) {
+	if (srs_is_client_gracefully_close(ret)) {
 		ret = ERROR_SOCKET_CLOSED;
 	}
     
@@ -74,7 +74,7 @@ void SrsConnection::cycle()
 	
 	// client close peer.
 	if (ret == ERROR_SOCKET_CLOSED) {
-		srs_trace("client disconnect peer. ret=%d", ret);
+		srs_warn("client disconnect peer. ret=%d", ret);
 	}
 	
 	server->remove(this);

@@ -218,11 +218,15 @@ void SrsFastLog::write_log(char *str_log, int size, int _level)
     log_data[size++] = 0;
     
     // if is error msg, then print color msg.
-    // \033[1;31m : red text code in shell
-    // \033[1;31m : normal text code
-    if (_level == SrsLogLevel::Error) {
-        printf("\033[1;31m%s\033[0m", str_log);
-    } else {
+    // \033[31m : red text code in shell
+    // \033[32m : green text code in shell
+    // \033[33m : yellow text code in shell
+    // \033[0m : normal text code
+    if (_level <= SrsLogLevel::Trace) {
         printf("%s", str_log);
+    } else if (_level == SrsLogLevel::Warn) {
+        printf("\033[33m%s\033[0m", str_log);
+    } else{
+        printf("\033[31m%s\033[0m", str_log);
     }
 }

@@ -29,3 +29,9 @@ bool srs_is_system_control_error(int error_code)
 		|| error_code == ERROR_CONTROL_REPUBLISH;
 }
 
+bool srs_is_client_gracefully_close(int error_code)
+{
+	return error_code == ERROR_SOCKET_READ
+		|| error_code == ERROR_SOCKET_READ_FULLY
+		|| error_code == ERROR_SOCKET_WRITE;
+}

@@ -162,5 +162,6 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * whether the error code is an system control error.
 */
 extern bool srs_is_system_control_error(int error_code);
+extern bool srs_is_client_gracefully_close(int error_code);
 
 #endif

@@ -371,7 +371,7 @@ int SrsProtocol::recv_message(SrsCommonMessage** pmsg)
 		SrsCommonMessage* msg = NULL;
 		
 		if ((ret = recv_interlaced_message(&msg)) != ERROR_SUCCESS) {
-			if (ret != ERROR_SOCKET_TIMEOUT) {
+			if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 				srs_error("recv interlaced message failed. ret=%d", ret);
 			}
 			return ret;
@@ -712,7 +712,7 @@ int SrsProtocol::recv_interlaced_message(SrsCommonMessage** pmsg)
 	int cid = 0;
 	int bh_size = 0;
 	if ((ret = read_basic_header(fmt, cid, bh_size)) != ERROR_SUCCESS) {
-		if (ret != ERROR_SOCKET_TIMEOUT) {
+		if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 			srs_error("read basic header failed. ret=%d", ret);
 		}
 		return ret;
@@ -749,7 +749,7 @@ int SrsProtocol::recv_interlaced_message(SrsCommonMessage** pmsg)
 	// chunk stream message header
 	int mh_size = 0;
 	if ((ret = read_message_header(chunk, fmt, bh_size, mh_size)) != ERROR_SUCCESS) {
-		if (ret != ERROR_SOCKET_TIMEOUT) {
+		if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 			srs_error("read message header failed. ret=%d", ret);
 		}
 		return ret;
@@ -763,7 +763,7 @@ int SrsProtocol::recv_interlaced_message(SrsCommonMessage** pmsg)
 	SrsCommonMessage* msg = NULL;
 	int payload_size = 0;
 	if ((ret = read_message_payload(chunk, bh_size, mh_size, payload_size, &msg)) != ERROR_SUCCESS) {
-		if (ret != ERROR_SOCKET_TIMEOUT) {
+		if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 			srs_error("read message payload failed. ret=%d", ret);
 		}
 		return ret;
@@ -797,7 +797,7 @@ int SrsProtocol::read_basic_header(char& fmt, int& cid, int& bh_size)
 	
 	int required_size = 1;
 	if ((ret = buffer->ensure_buffer_bytes(skt, required_size)) != ERROR_SUCCESS) {
-		if (ret != ERROR_SOCKET_TIMEOUT) {
+		if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 			srs_error("read 1bytes basic header failed. required_size=%d, ret=%d", required_size, ret);
 		}
 		return ret;
@@ -817,7 +817,7 @@ int SrsProtocol::read_basic_header(char& fmt, int& cid, int& bh_size)
 	if (cid == 0) {
 		required_size = 2;
 		if ((ret = buffer->ensure_buffer_bytes(skt, required_size)) != ERROR_SUCCESS) {
-			if (ret != ERROR_SOCKET_TIMEOUT) {
+			if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 				srs_error("read 2bytes basic header failed. required_size=%d, ret=%d", required_size, ret);
 			}
 			return ret;
@@ -830,7 +830,7 @@ int SrsProtocol::read_basic_header(char& fmt, int& cid, int& bh_size)
 	} else if (cid == 1) {
 		required_size = 3;
 		if ((ret = buffer->ensure_buffer_bytes(skt, 3)) != ERROR_SUCCESS) {
-			if (ret != ERROR_SOCKET_TIMEOUT) {
+			if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 				srs_error("read 3bytes basic header failed. required_size=%d, ret=%d", required_size, ret);
 			}
 			return ret;
@@ -908,7 +908,7 @@ int SrsProtocol::read_message_header(SrsChunkStream* chunk, char fmt, int bh_siz
 	
 	int required_size = bh_size + mh_size;
 	if ((ret = buffer->ensure_buffer_bytes(skt, required_size)) != ERROR_SUCCESS) {
-		if (ret != ERROR_SOCKET_TIMEOUT) {
+		if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 			srs_error("read %dbytes message header failed. required_size=%d, ret=%d", mh_size, required_size, ret);
 		}
 		return ret;
@@ -1017,7 +1017,7 @@ int SrsProtocol::read_message_header(SrsChunkStream* chunk, char fmt, int bh_siz
 		required_size = bh_size + mh_size;
 		srs_verbose("read header ext time. fmt=%d, ext_time=%d, mh_size=%d", fmt, chunk->extended_timestamp, mh_size);
 		if ((ret = buffer->ensure_buffer_bytes(skt, required_size)) != ERROR_SUCCESS) {
-			if (ret != ERROR_SOCKET_TIMEOUT) {
+			if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 				srs_error("read %dbytes message header failed. required_size=%d, ret=%d", mh_size, required_size, ret);
 			}
 			return ret;
@@ -1119,7 +1119,7 @@ int SrsProtocol::read_message_payload(SrsChunkStream* chunk, int bh_size, int mh
 	// read payload to buffer
 	int required_size = bh_size + mh_size + payload_size;
 	if ((ret = buffer->ensure_buffer_bytes(skt, required_size)) != ERROR_SUCCESS) {
-		if (ret != ERROR_SOCKET_TIMEOUT) {
+		if (ret != ERROR_SOCKET_TIMEOUT && !srs_is_client_gracefully_close(ret)) {
 			srs_error("read payload failed. required_size=%d, ret=%d", required_size, ret);
 		}
 		return ret;