add unit test

Former-commit-id: c0a1f4895d533dcf5568a99c5bd2e81169f70946

cpp/src/utils/LogUtil.cpp

@@ -27,7 +27,7 @@ static int fatal_idx = 0;
 }
 
 // TODO(yzb) : change the easylogging library to get the log level from parameter rather than filename
-void rolloutHandler(const char *filename, std::size_t size) {
+void RolloutHandler(const char *filename, std::size_t size) {
     char *dirc = strdup(filename);
     char *basec = strdup(filename);
     char *dir = dirname(dirc);
@@ -112,7 +112,7 @@ int32_t InitLog(const std::string &log_config_file) {
     el::Loggers::reconfigureAllLoggers(conf);
 
     el::Loggers::addFlag(el::LoggingFlag::StrictLogFileSizeCheck);
-    el::Helpers::installPreRollOutCallback(rolloutHandler);
+    el::Helpers::installPreRollOutCallback(RolloutHandler);
     return 0;
 }
 

cpp/src/utils/LogUtil.h

@@ -16,6 +16,7 @@ inline std::string GetFileName(std::string filename) {
     int pos = filename.find_last_of('/');
     return filename.substr(pos + 1);
 }
+void RolloutHandler(const char *filename, std::size_t size);
 
 #define SHOW_LOCATION
 #ifdef SHOW_LOCATION

cpp/unittest/server/util_test.cpp

@@ -6,6 +6,9 @@
 #include <gtest/gtest.h>
 #include <thread>
 #include <easylogging++.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <boost/filesystem.hpp>
 
 #include "utils/CommonUtil.h"
 #include "utils/Error.h"
@@ -251,3 +254,30 @@ TEST(UtilTest, TIMERECORDER_TEST) {
         rc.RecordSection("end");
     }
 }
+
+TEST(UtilTest, ROLLOUTHANDLER_TEST){
+    std::string dir1 = "/tmp/milvus_test";
+    std::string dir2 = "/tmp/milvus_test/log_test";
+    std::string filename[6] = {"log_global.log", "log_debug.log", "log_warning.log", "log_trace.log", "log_error.log", "log_fatal.log"};
+
+    mkdir(dir1.c_str(), S_IRWXU);
+    mkdir(dir2.c_str(), S_IRWXU);
+    for (int i = 0; i < 6; ++i) {
+        std::string tmp = dir2 + "/" + filename[i];
+
+        std::ofstream file;
+        file.open(tmp.c_str());
+        file << "zilliz" << std::endl;
+
+        server::RolloutHandler(tmp.c_str(), 0);
+
+        tmp.append(".1");
+        std::ifstream file2;
+        file2.open(tmp);
+
+        std::string tmp2;
+        file2 >> tmp2;
+        ASSERT_EQ(tmp2, "zilliz");
+    }
+    boost::filesystem::remove_all(dir2);
+}
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