From 642b59ca0364b9dd74ad5efa1975462140f0a7ba Mon Sep 17 00:00:00 2001
From: schwaers
Date: Thu, 30 Apr 2015 16:47:58 +0200
Subject: [SERVER] PoC RPC interface

---
 CMakeLists.txt          |  7 +++---
 cmake/FindJansson.cmake | 59 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/server/net.c        |  8 +++++--
 src/server/rpc.c        | 18 +++++++++++++++
 src/server/rpc.h        |  7 ++++++
 5 files changed, 94 insertions(+), 5 deletions(-)
 create mode 100644 cmake/FindJansson.cmake
 create mode 100644 src/server/rpc.c
 create mode 100644 src/server/rpc.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d734813..bd9fa93 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,9 +31,10 @@ ADD_DEFINITIONS(-DWITH_IPV6)
 
 FIND_PACKAGE(Threads)
 FIND_PACKAGE(Fuse)
-FIND_PACKAGE(PkgConfig REQUIRED)
+#FIND_PACKAGE(PkgConfig REQUIRED)
 #FIND_PACKAGE(LibXml2 REQUIRED)
 FIND_PACKAGE(ZLIB)
+FIND_PACKAGE(Jansson)
 
 if(NOT FUSE_FOUND)
 	message( " *** No fuse dev libs found, won't build dnbd3-fuse" )
@@ -46,7 +47,7 @@ endif()
 
 #PKG_CHECK_MODULES(GLIB glib-2.0 REQUIRED)
 
-INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR} ${ZLIB_INCLUDE_DIR} ${FUSE_INCLUDE_DIR})
+INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR} ${ZLIB_INCLUDE_DIR} ${FUSE_INCLUDE_DIR} ${JANSSON_INCLUDE_DIR})
 
 ################################################################################
 # VERSION HEADER                                                               #
@@ -87,7 +88,7 @@ INSTALL(TARGETS dnbd3-client RUNTIME DESTINATION sbin)
 if(THREADS_FOUND AND ZLIB_FOUND)
 	FILE(GLOB_RECURSE SERVER_SRCS src/server/*.c)
 	ADD_EXECUTABLE(dnbd3-server ${SERVER_SRCS})
-	TARGET_LINK_LIBRARIES(dnbd3-server ${CMAKE_THREAD_LIBS_INIT} ${ZLIB_LIBRARIES})
+	TARGET_LINK_LIBRARIES(dnbd3-server ${CMAKE_THREAD_LIBS_INIT} ${ZLIB_LIBRARIES} ${JANSSON_LIBRARIES})
 	if(UNIX AND NOT APPLE)
 		target_link_libraries(dnbd3-server rt)
 	endif()
diff --git a/cmake/FindJansson.cmake b/cmake/FindJansson.cmake
new file mode 100644
index 0000000..3225923
--- /dev/null
+++ b/cmake/FindJansson.cmake
@@ -0,0 +1,59 @@
+# - Try to find Jansson
+# Once done this will define
+#
+#  JANSSON_FOUND - system has Jansson
+#  JANSSON_INCLUDE_DIRS - the Jansson include directory
+#  JANSSON_LIBRARIES - Link these to use Jansson
+#
+#  Copyright (c) 2011 Lee Hambley <lee.hambley@gmail.com>
+#
+#  Redistribution and use is allowed according to the terms of the New
+#  BSD license.
+#  For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+#
+
+if (JANSSON_LIBRARIES AND JANSSON_INCLUDE_DIRS)
+  # in cache already
+  set(JANSSON_FOUND TRUE)
+else (JANSSON_LIBRARIES AND JANSSON_INCLUDE_DIRS)
+  find_path(JANSSON_INCLUDE_DIR
+    NAMES
+      jansson.h
+    PATHS
+      /usr/include
+      /usr/local/include
+      /opt/local/include
+      /sw/include
+  )
+
+find_library(JANSSON_LIBRARY
+    NAMES
+      jansson
+    PATHS
+      /usr/lib
+      /usr/local/lib
+      /opt/local/lib
+      /sw/lib
+  )
+
+set(JANSSON_INCLUDE_DIRS
+  ${JANSSON_INCLUDE_DIR}
+  )
+
+if (JANSSON_LIBRARY)
+  set(JANSSON_LIBRARIES
+    ${JANSSON_LIBRARIES}
+    ${JANSSON_LIBRARY}
+    )
+endif (JANSSON_LIBRARY)
+
+  include(FindPackageHandleStandardArgs)
+  find_package_handle_standard_args(Jansson DEFAULT_MSG
+    JANSSON_LIBRARIES JANSSON_INCLUDE_DIRS)
+
+  # show the JANSSON_INCLUDE_DIRS and JANSSON_LIBRARIES variables only in the advanced view
+  mark_as_advanced(JANSSON_INCLUDE_DIRS JANSSON_LIBRARIES)
+
+endif (JANSSON_LIBRARIES AND JANSSON_INCLUDE_DIRS)
+
+
diff --git a/src/server/net.c b/src/server/net.c
index 9836043..2edb398 100644
--- a/src/server/net.c
+++ b/src/server/net.c
@@ -43,6 +43,8 @@
 #include "../config.h"
 #include "../types.h"
 #include "locks.h"
+#include "rpc.h"
+
 
 static uint64_t totalBytesSent = 0;
 static pthread_spinlock_t statisticsSentLock;
@@ -66,8 +68,7 @@ static inline bool recv_request_header(int sock, dnbd3_request_t *request)
 	}
 	// Payload sanity check
 	if ( request->cmd != CMD_GET_BLOCK && request->size > MAX_PAYLOAD ) {
-		logadd( LOG_WARNING, "Client tries to send a packet of type %d with %d bytes payload. Dropping client.", (int)request->cmd,
-		        (int)request->size );
+		logadd( LOG_WARNING, "Client tries to send a packet of type %d with %d bytes payload. Dropping client.", (int)request->cmd, (int)request->size );
 		return false;
 	}
 	return true;
@@ -187,6 +188,9 @@ void *net_client_handler(void *dnbd3_client)
 				}
 			}
 		}
+	} else if ( strncmp( (char*)&request, "GET ", 4 ) == 0 || strncmp( (char*)&request, "POST ", 5 ) == 0 ) {
+		rpc_sendStatsJson( client->sock );
+		logadd( LOG_INFO, "Sending statistics." );
 	}
 
 	if ( bOk ) {
diff --git a/src/server/rpc.c b/src/server/rpc.c
new file mode 100644
index 0000000..b2dc088
--- /dev/null
+++ b/src/server/rpc.c
@@ -0,0 +1,18 @@
+#include <unistd.h>
+#include <jansson.h>
+
+#include "rpc.h"
+
+void rpc_sendStatsJson(int sock)
+{
+	int receivedBytes = 0;
+	int sentBytes = 1;
+	json_t *statisticsJson = json_pack( "{sisi}", "receivedBytes", receivedBytes, "sentBytes", sentBytes );
+	char* jsonString = json_dumps(statisticsJson, 0);
+	char bla[500];
+	snprintf(bla, sizeof bla, "HTTP/1.1 200 OK\r\nConnection: Close\r\nContent-Length: %d\r\nContent-Type: application/json\r\n\r\n", (int)strlen(jsonString));
+	write( sock, bla, strlen(bla) );
+	int n = write( sock, jsonString, strlen(jsonString));
+	json_decref(statisticsJson);
+	free(jsonString);
+}
diff --git a/src/server/rpc.h b/src/server/rpc.h
new file mode 100644
index 0000000..78585cf
--- /dev/null
+++ b/src/server/rpc.h
@@ -0,0 +1,7 @@
+#ifndef _RPC_H_
+#define _RPC_H_
+
+
+void rpc_sendStatsJson(int sock);
+
+#endif
-- 
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