forked from vicanso/pike
/
server_timing.go
111 lines (102 loc) · 2.65 KB
/
server_timing.go
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package pike
import (
"fmt"
"strconv"
"strings"
"time"
)
const (
// ServerTimingPike pike
ServerTimingPike = iota
// ServerTimingInitialization init中间件
ServerTimingInitialization
// ServerTimingIdentifier identifier中间件
ServerTimingIdentifier
// ServerTimingDirectorPicker director picker中间件
ServerTimingDirectorPicker
// ServerTimingCacheFetcher cache fetcher中间件
ServerTimingCacheFetcher
// ServerTimingProxy proxy中间件
ServerTimingProxy
// ServerTimingHeaderSetter header setter中间件
ServerTimingHeaderSetter
// ServerTimingFreshChecker fresh checker中间件
ServerTimingFreshChecker
// ServerTimingDispatcher dispatcher中间件
ServerTimingDispatcher
// ServerTimingEnd server timing end
ServerTimingEnd
)
var (
// serverTimingDesList server timing的描述
serverTimingDesList = []string{
"0;dur=%s;desc=\"pike\"",
"1;dur=%s;desc=\"init\"",
"2;dur=%s;desc=\"identifier\"",
"3;dur=%s;desc=\"director picker\"",
"4;dur=%s;desc=\"cache fetcher\"",
"5;dur=%s;desc=\"proxy\"",
"6;dur=%s;desc=\"header setter\"",
"7;dur=%s;desc=\"fresh checker\"",
"7;dur=%s;desc=\"dispatcher\"",
}
)
type (
// ServerTiming server timing
ServerTiming struct {
disabled bool
startedAt int64
startedAtList []int64
useList []int64
}
)
// NewServerTiming create a server timing
func NewServerTiming() *ServerTiming {
return &ServerTiming{
startedAtList: make([]int64, ServerTimingEnd),
useList: make([]int64, ServerTimingEnd),
startedAt: time.Now().UnixNano(),
}
}
// Reset 重置
func (st *ServerTiming) Reset() {
useList := st.useList
for i := range useList {
useList[i] = 0
}
st.startedAt = time.Now().UnixNano()
}
// Start 开始server timing的记录
func (st *ServerTiming) Start(index int) func() {
if st.disabled || index <= ServerTimingPike || index >= ServerTimingEnd {
return noop
}
startedAt := time.Now().UnixNano()
return func() {
st.useList[index] = time.Now().UnixNano() - startedAt
// if st.useList[index] > 10000000 {
// log.Infof("%s use %d", serverTimingDesList[index], st.useList[index])
// }
}
}
// String 获取server timing的http header string
func (st *ServerTiming) String() string {
if st.disabled {
return ""
}
desList := []string{}
ms := float64(time.Millisecond)
// use := st.use
appendDesc := func(v int64, str string) {
desc := fmt.Sprintf(str, strconv.FormatFloat(float64(v)/ms, 'f', -1, 64))
desList = append(desList, desc)
}
useList := st.useList
useList[0] = time.Now().UnixNano() - st.startedAt
for i, v := range st.useList {
if v != 0 {
appendDesc(v, serverTimingDesList[i])
}
}
return strings.Join(desList, ",")
}