first commit

utils/logger/vp_log_file_writer.cpp

@@ -0,0 +1,75 @@
+
+
+#include "vp_log_file_writer.h"
+
+
+namespace vp_utils {
+        
+    vp_log_file_writer::vp_log_file_writer() {
+
+    }
+    
+    vp_log_file_writer::~vp_log_file_writer() {
+        if (log_writer.is_open()) {
+            log_writer.close();
+        }
+    }
+    
+    void vp_log_file_writer::init(std::string log_dir, std::string log_file_name_template) {
+        this->log_dir = log_dir;
+        this->log_file_name_template = log_file_name_template;
+        
+        // open log file first time
+        auto f = create_valid_log_file_name();
+        log_writer.open(f, std::ofstream::out | std::ofstream::app);
+
+        inited = true;
+    }
+
+
+    void vp_log_file_writer::write(std::string log) {
+        if (!inited) {
+            throw "vp_log_file_writer not initialized!";
+        }
+        
+        // check if need create new log file
+        if (get_now_day() != log_day) {
+            if (log_writer.is_open()) {
+                log_writer.close();
+            }
+
+            auto f = create_valid_log_file_name();
+            log_writer.open(f, std::ofstream::out | std::ofstream::app);
+        }
+        
+        log_writer << log << std::endl;
+    }
+
+    std::string vp_log_file_writer::create_valid_log_file_name() {
+        if (!std::experimental::filesystem::exists(log_dir)) {
+            std::experimental::filesystem::create_directories(log_dir);
+        }
+        std::experimental::filesystem::path root_dir(log_dir);
+
+        auto f_name = vp_utils::time_format(NOW, log_file_name_template);
+        auto p = root_dir / f_name;
+        
+        // cache log start day
+        log_day = get_now_day();
+
+        return p.string();
+    }
+
+    int vp_log_file_writer::get_now_day() {
+        std::vector<int> time_parts;
+        vp_utils::time_split(NOW, time_parts);
+        
+        // refer to vp_utils::time_split(...), indice 2 is day
+        return time_parts[2];
+    }
+
+    vp_log_file_writer& vp_log_file_writer::operator<<(std::string log) {
+        write(log);
+        return *this;
+    }
+}