feat(logging): rotating log files (#5485)

tools/sunshinesvc.cpp

@@ -8,6 +8,9 @@
 #include <Windows.h>
 #include <WtsApi32.h>
 
+// local includes
+#include "src/logging.h"
+
 // PROC_THREAD_ATTRIBUTE_JOB_LIST is currently missing from MinGW headers
 #ifndef PROC_THREAD_ATTRIBUTE_JOB_LIST
   #define PROC_THREAD_ATTRIBUTE_JOB_LIST ProcThreadAttributeValue(13, FALSE, TRUE, FALSE)
@@ -123,10 +126,13 @@ HANDLE OpenLogFileHandle() {
   GetTempPathW(_countof(log_file_name), log_file_name);
   wcscat_s(log_file_name, L"sunshine.log");
 
+  // Preserve previous service output before opening the current log.
+  logging::rotate_log_file(log_file_name);
+
   // The file handle must be inheritable for our child process to use it
   SECURITY_ATTRIBUTES security_attributes = {sizeof(security_attributes), nullptr, TRUE};
 
-  // Overwrite the old sunshine.log
+  // Create the current sunshine.log
   return CreateFileW(log_file_name, GENERIC_WRITE, FILE_SHARE_READ, &security_attributes, CREATE_ALWAYS, 0, nullptr);
 }