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| Original file line number | Diff line number | Diff line change |
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| // MIT License | ||
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| // Copyright (c) 2021 Tree Xie | ||
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| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
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| // The above copyright notice and this permission notice shall be included in all | ||
| // copies or substantial portions of the Software. | ||
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| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| // SOFTWARE. | ||
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| package elton | ||
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| import ( | ||
| "context" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
| ) | ||
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| type ( | ||
| // TraceInfo trace's info | ||
| TraceInfo struct { | ||
| Middleware bool `json:"-"` | ||
| Name string `json:"name,omitempty"` | ||
| Duration time.Duration `json:"duration,omitempty"` | ||
| } | ||
| // TraceInfos trace infos | ||
| TraceInfos []*TraceInfo | ||
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| Trace struct { | ||
| calculateDone bool | ||
| Infos TraceInfos | ||
| } | ||
| ) | ||
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| // NewTrace returns a new trace | ||
| func NewTrace() *Trace { | ||
| return &Trace{ | ||
| Infos: make(TraceInfos, 0), | ||
| } | ||
| } | ||
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| // Add adds trace info to trace | ||
| func (t *Trace) Add(info *TraceInfo) *Trace { | ||
| t.Infos = append(t.Infos, info) | ||
| return t | ||
| } | ||
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| // Calculate calculates the duration of middleware | ||
| func (t *Trace) Calculate() { | ||
| if t.calculateDone { | ||
| return | ||
| } | ||
| // middleware需要减去后面middleware的处理时长 | ||
| var cur *TraceInfo | ||
| for _, item := range t.Infos { | ||
| if !item.Middleware { | ||
| continue | ||
| } | ||
| if cur != nil { | ||
| cur.Duration -= item.Duration | ||
| } | ||
| cur = item | ||
| } | ||
| t.calculateDone = true | ||
| } | ||
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| func getMs(ns int) string { | ||
| microSecond := int(time.Microsecond) | ||
| milliSecond := int(time.Millisecond) | ||
| if ns < microSecond { | ||
| return "0" | ||
| } | ||
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| // 计算ms的位 | ||
| ms := ns / milliSecond | ||
| prefix := strconv.Itoa(ms) | ||
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| // 计算micro seconds | ||
| offset := (ns % milliSecond) / microSecond | ||
| // 如果小于10，不展示小数点（取小数点两位） | ||
| unit := 10 | ||
| if offset < unit { | ||
| return prefix | ||
| } | ||
| // 如果小于100，补一位0 | ||
| if offset < 100 { | ||
| return prefix + ".0" + strconv.Itoa(offset/unit) | ||
| } | ||
| return prefix + "." + strconv.Itoa(offset/unit) | ||
| } | ||
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| // ServerTiming return server timing with prefix | ||
| func (traceInfos TraceInfos) ServerTiming(prefix string) string { | ||
| size := len(traceInfos) | ||
| if size == 0 { | ||
| return "" | ||
| } | ||
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| // 转换为 http server timing | ||
| s := new(strings.Builder) | ||
| // 每一个server timing长度预估为30 | ||
| s.Grow(30 * size) | ||
| for i, traceInfo := range traceInfos { | ||
| v := traceInfo.Duration.Nanoseconds() | ||
| s.WriteString(prefix) | ||
| s.WriteString(strconv.Itoa(i)) | ||
| s.Write(ServerTimingDur) | ||
| s.WriteString(getMs(int(v))) | ||
| s.Write(ServerTimingDesc) | ||
| s.WriteString(traceInfo.Name) | ||
| s.Write(ServerTimingEnd) | ||
| if i != size-1 { | ||
| s.WriteRune(',') | ||
| } | ||
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| } | ||
| return s.String() | ||
| } | ||
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| // GetTrace get trace from context, if context without trace, new trace will be created. | ||
| func GetTrace(ctx context.Context) *Trace { | ||
| value := ctx.Value(ContextTraceKey) | ||
| if value == nil { | ||
| return NewTrace() | ||
| } | ||
| trace, ok := value.(*Trace) | ||
| if !ok { | ||
| return NewTrace() | ||
| } | ||
| return trace | ||
| } |
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