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优化mktime性能问题

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This commit is contained in:
ziyue 2022-02-11 11:54:12 +08:00
parent d541ed2572
commit 832c8d0d80
1 changed files with 68 additions and 23 deletions
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53
src/Http/HttpCookie.cpp
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@ -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 */