diff options
Diffstat (limited to 'src/helsinki.at/rhrdtime/rhrdtime.go')
| -rw-r--r-- | src/helsinki.at/rhrdtime/rhrdtime.go | 38 |
1 files changed, 11 insertions, 27 deletions
diff --git a/src/helsinki.at/rhrdtime/rhrdtime.go b/src/helsinki.at/rhrdtime/rhrdtime.go index 519d465..5fa72a1 100644 --- a/src/helsinki.at/rhrdtime/rhrdtime.go +++ b/src/helsinki.at/rhrdtime/rhrdtime.go @@ -28,7 +28,6 @@ import ( "encoding/json" "flag" "fmt" - "math" "net/http" "time" @@ -36,35 +35,21 @@ import ( "github.com/gorilla/websocket" ) -func getRDWeekAndOffset(t time.Time) (uint8, int) { - // - // This computes the current Rivendell Week based on the number - // of weeks since epoch. - // - // Explanation: - // epoch was at 01.01.1970 UTC which was a Thursday. - // Monday in that week is (s-from-epoch + 3*24*60*60) seconds ago. - // This needs to be adjusted by the timezone offset for Europe/Vienna - // which is of course not constant (damn you daylight savings time) - // Divide this by (7*24*60*60) and you get the number of - // weeks since the Monday in the week of epoch adjusted for timezone offsets. - // This week had week number 3 so add an offset of 2 and - // get the modulo of 4. This rounded down gives you the current week - // with 0 meaning Week 1. So add 1 to that number and you will get - // the current RD week. - // - - loc, err := time.LoadLocation("Europe/Vienna") - if err != nil { +var ( + loc *time.Location +) + +func init() { + var err error + if loc, err = time.LoadLocation("Europe/Vienna"); err != nil { fmt.Println("Error while loading loaction Europe/Vienna:", err) - return 0, 0 } +} +func getTZOffset(t time.Time) int { t = t.In(loc) _, offset := t.Zone() - - sEpoch := t.Unix() + int64(offset) - return uint8(math.Floor(math.Mod((((float64(sEpoch)+259200)/604800)+2), 4)) + 1), offset + return offset } type ntpMessage struct { @@ -73,7 +58,6 @@ type ntpMessage struct { T3 int64 `json:"t3"` T4 int64 `json:"t4"` TZOffset int `json:"tz_offset"` - Week uint8 `json:"week"` } func handleNTPClient(w http.ResponseWriter, r *http.Request) { @@ -103,7 +87,7 @@ func handleNTPClient(w http.ResponseWriter, r *http.Request) { } n.T2 = (now_t2.Unix() * 1000) + int64(now_t2.Nanosecond()/1000000) - n.Week, n.TZOffset = getRDWeekAndOffset(now_t2) + n.TZOffset = getTZOffset(now_t2) now_t3 := time.Now() n.T3 = (now_t3.Unix() * 1000) + int64(now_t3.Nanosecond()/1000000) |