优化mktime性能问题

src/Http/HttpCookie.cpp

@@ -10,7 +10,7 @@
 
 #include "HttpCookie.h"
 #include "Util/util.h"
-#include "Util/logger.h"
+#include "Util/onceToken.h"
 
 #if defined(_WIN32)
 #include "Util/strptime_win.h"
@@ -21,28 +21,75 @@ using namespace std;
 
 namespace mediakit {
 
-void HttpCookie::setPath(const string &path){
+void HttpCookie::setPath(const string &path) {
     _path = path;
 }
-void HttpCookie::setHost(const string &host){
+
+void HttpCookie::setHost(const string &host) {
     _host = host;
 }
-static time_t timeStrToInt(const string &date){
-    struct tm tt;
-    strptime(date.data(),"%a, %b %d %Y %H:%M:%S %Z",&tt);
-    return mktime(&tt);
+
+static long s_gmtoff = 0; //时间差
+static onceToken s_token([]() {
+#ifdef _WIN32
+    TIME_ZONE_INFORMATION tzinfo;
+    DWORD dwStandardDaylight;
+    long bias;
+    dwStandardDaylight = GetTimeZoneInformation(&tzinfo);
+    bias = tzinfo.Bias;
+    if (dwStandardDaylight == TIME_ZONE_ID_STANDARD) {
+        bias += tzinfo.StandardBias;
+    }
+    if (dwStandardDaylight == TIME_ZONE_ID_DAYLIGHT) {
+        bias += tzinfo.DaylightBias;
+    }
+    s_gmtoff = -bias * 60; //时间差(分钟)
+#else
+    s_gmtoff = getLocalTime(time(nullptr)).tm_gmtoff;
+#endif // _WIN32
+});
+
+// from https://gmbabar.wordpress.com/2010/12/01/mktime-slow-use-custom-function/#comment-58
+static time_t time_to_epoch(const struct tm *ltm, int utcdiff) {
+    const int mon_days[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+    long tyears, tdays, leaps, utc_hrs;
+    int i;
+
+    tyears = ltm->tm_year - 70; // tm->tm_year is from 1900.
+    leaps = (tyears + 2) / 4; // no of next two lines until year 2100.
+    // i = (ltm->tm_year – 100) / 100;
+    // leaps -= ( (i/4)*3 + i%4 );
+    tdays = 0;
+    for (i = 0; i < ltm->tm_mon; i++)
+        tdays += mon_days[i];
+
+    tdays += ltm->tm_mday - 1; // days of month passed.
+    tdays = tdays + (tyears * 365) + leaps;
+
+    utc_hrs = ltm->tm_hour + utcdiff; // for your time zone.
+    return (tdays * 86400) + (utc_hrs * 3600) + (ltm->tm_min * 60) + ltm->tm_sec;
 }
-void HttpCookie::setExpires(const string &expires,const string &server_date){
+
+static time_t timeStrToInt(const string &date) {
+    struct tm tt;
+    strptime(date.data(), "%a, %b %d %Y %H:%M:%S %Z", &tt);
+    // mktime内部有使用互斥锁，非常影响性能
+    return time_to_epoch(&tt, s_gmtoff / 3600); // mktime(&tt);
+}
+
+void HttpCookie::setExpires(const string &expires, const string &server_date) {
     _expire = timeStrToInt(expires);
-    if(!server_date.empty()){
-        _expire =  time(NULL) + (_expire - timeStrToInt(server_date));
+    if (!server_date.empty()) {
+        _expire = time(NULL) + (_expire - timeStrToInt(server_date));
     }
 }
-void HttpCookie::setKeyVal(const string &key,const string &val){
+
+void HttpCookie::setKeyVal(const string &key, const string &val) {
     _key = key;
     _val = val;
 }
-HttpCookie::operator bool (){
+
+HttpCookie::operator bool() {
     return !_host.empty() && !_key.empty() && !_val.empty() && (_expire > time(NULL));
 }
 
@@ -50,19 +97,18 @@ const string &HttpCookie::getVal() const {
     return _val;
 }
 
-const string &HttpCookie::getKey() const{
+const string &HttpCookie::getKey() const {
     return _key;
 }
 
-
-HttpCookieStorage &HttpCookieStorage::Instance(){
+HttpCookieStorage &HttpCookieStorage::Instance() {
     static HttpCookieStorage instance;
     return instance;
 }
 
 void HttpCookieStorage::set(const HttpCookie::Ptr &cookie) {
     lock_guard<mutex> lck(_mtx_cookie);
-    if(!cookie || !(*cookie)){
+    if (!cookie || !(*cookie)) {
         return;
     }
     _all_cookie[cookie->_host][cookie->_path][cookie->_key] = cookie;
@@ -71,20 +117,20 @@ void HttpCookieStorage::set(const HttpCookie::Ptr &cookie) {
 vector<HttpCookie::Ptr> HttpCookieStorage::get(const string &host, const string &path) {
     vector<HttpCookie::Ptr> ret(0);
     lock_guard<mutex> lck(_mtx_cookie);
-    auto it =  _all_cookie.find(host);
-    if(it == _all_cookie.end()){
+    auto it = _all_cookie.find(host);
+    if (it == _all_cookie.end()) {
         //未找到该host相关记录
         return ret;
     }
     //遍历该host下所有path
-    for(auto &pr : it->second){
-        if(path.find(pr.first) != 0){
+    for (auto &pr : it->second) {
+        if (path.find(pr.first) != 0) {
             //这个path不匹配
             continue;
         }
         //遍历该path下的各个cookie
-        for(auto it_cookie = pr.second.begin() ; it_cookie != pr.second.end() ; ){
-            if(!*(it_cookie->second)){
+        for (auto it_cookie = pr.second.begin(); it_cookie != pr.second.end();) {
+            if (!*(it_cookie->second)) {
                 //该cookie已经过期，移除之
                 it_cookie = pr.second.erase(it_cookie);
                 continue;
@@ -97,5 +143,4 @@ vector<HttpCookie::Ptr> HttpCookieStorage::get(const string &host, const string
     return ret;
 }
 
-
 } /* namespace mediakit */