Add log support and tests

Former-commit-id: f946b994174633082110e8d5b26640998e4ed35e

cpp/conf/vecwise_engine_log.conf

+* GLOBAL:
+    FORMAT                  =   "%datetime | %level | %logger | %msg"
+    FILENAME                =   "/tmp/logs/vecwise/vecwise_engine-%datetime{%H:%m}-global.log"
+    ENABLED                 =   true
+    TO_FILE                 =   true
+    TO_STANDARD_OUTPUT      =   true
+    SUBSECOND_PRECISION     =   3
+    PERFORMANCE_TRACKING    =   false
+    MAX_LOG_FILE_SIZE       =   2097152 ## Throw log files away after 2MB
+* DEBUG:
+    FILENAME                =   "/tmp/logs/vecwise/vecwise_engine-%datetime{%H:%m}-debug.log"
+    ENABLED                 =   true
+* WARNING:
+    FILENAME                =   "/tmp/logs/vecwise/vecwise_engine-%datetime{%H:%m}-warning.log"
+* TRACE:
+    FILENAME                =   "/tmp/logs/vecwise/vecwise_engine-%datetime{%H:%m}-trace.log"
+* VERBOSE:
+    FORMAT                  =   "%datetime{%d/%M/%y} | %level-%vlevel | %msg"
+    TO_FILE                 =   false
+    TO_STANDARD_OUTPUT      =   true
+## Error logs
+* ERROR:
+    ENABLED                 =   false
+    FILENAME                =   "/tmp/logs/vecwise/vecwise_engine-%datetime{%H:%m}-error.log"
+* FATAL:
+    ENABLED                 =   false
+    FILENAME                =   "/tmp/logs/vecwise/vecwise_engine-%datetime{%H:%m}-fatal.log"
\ No newline at end of file

cpp/src/CMakeLists.txt

@@ -4,10 +4,10 @@
 # Proprietary and confidential.
 #-------------------------------------------------------------------------------
 
-aux_source_directory(./cache cache_files)
-aux_source_directory(./config config_files)
-aux_source_directory(./server server_files)
-aux_source_directory(./utils utils_files)
+aux_source_directory(cache cache_files)
+aux_source_directory(config config_files)
+aux_source_directory(server server_files)
+aux_source_directory(utils utils_files)
 
 set(vecwise_engine_src
         ${CMAKE_CURRENT_SOURCE_DIR}/main.cpp

cpp/unittest/CMakeLists.txt

@@ -9,7 +9,7 @@ link_directories(
 )
 
 set(unittest_srcs
-        ${CMAKE_CURRENT_SOURCE_DIR}/vecwise_test.cpp)
+        ${CMAKE_CURRENT_SOURCE_DIR}/vecwise_test.cpp ${VECWISE_THIRD_PARTY_BUILD}/include/easylogging++.cc)
 
 set(unittest_libs
         gtest_main

cpp/unittest/log/log_tests.cpp

@@ -4,16 +4,17 @@
 // Proprietary and confidential.
 ////////////////////////////////////////////////////////////////////////////////
 #include <gtest/gtest.h>
+#include "easylogging++.h"
 
+class LogTest: public testing::Test {
+protected:
+    void SetUp() override {
+        el::Configurations conf("../../../conf/vecwise_engine_log.conf");
+        el::Loggers::reconfigureAllLoggers(conf);
+    }
+};
 
-TEST(LogTest, INIT_TEST) {
-    ASSERT_STREQ("A", "A");
-}
-
-TEST(LogTest, RUN_TEST) {
-    ASSERT_STREQ("B", "B");
-}
-
-TEST(LogTest, FINISH_TEST) {
-    ASSERT_STREQ("C", "C");
+TEST_F(LogTest, TEST) {
+    EXPECT_FALSE(el::Loggers::hasFlag(el::LoggingFlag::NewLineForContainer));
+    EXPECT_FALSE(el::Loggers::hasFlag(el::LoggingFlag::LogDetailedCrashReason));
 }
\ No newline at end of file

cpp/unittest/vecwise_test.cpp

@@ -5,6 +5,9 @@
 ////////////////////////////////////////////////////////////////////////////////
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>
+#include <easylogging++.h>
+
+INITIALIZE_EASYLOGGINGPP
 
 int main(int argc, char **argv) {
     ::testing::InitGoogleTest(&argc, argv);