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"
@@ -24,24 +24,71 @@ namespace mediakit {
 void HttpCookie::setPath(const string &path) {
     _path = path;
 }
+
 void HttpCookie::setHost(const string &host) {
     _host = host;
 }
+
+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;
+}
+
 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);
+    // 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));
     }
 }
+
 void HttpCookie::setKeyVal(const string &key, const string &val) {
     _key = key;
     _val = val;
 }
+
 HttpCookie::operator bool() {
     return !_host.empty() && !_key.empty() && !_val.empty() && (_expire > time(NULL));
 }
@@ -54,7 +101,6 @@ const string &HttpCookie::getKey() const{
     return _key;
 }
 
-
 HttpCookieStorage &HttpCookieStorage::Instance() {
     static HttpCookieStorage instance;
     return instance;
@@ -97,5 +143,4 @@ vector<HttpCookie::Ptr> HttpCookieStorage::get(const string &host, const string
     return ret;
 }
 
-
 } /* namespace mediakit */