traefik/vendor/github.com/thoas/stats/stats.go
2017-03-09 13:13:02 +01:00

168 lines
4.3 KiB
Go

package stats
import (
"fmt"
"net/http"
"os"
"sync"
"time"
)
// Stats data structure
type Stats struct {
mu sync.RWMutex
Uptime time.Time
Pid int
ResponseCounts map[string]int
TotalResponseCounts map[string]int
TotalResponseTime time.Time
}
// New constructs a new Stats structure
func New() *Stats {
stats := &Stats{
Uptime: time.Now(),
Pid: os.Getpid(),
ResponseCounts: map[string]int{},
TotalResponseCounts: map[string]int{},
TotalResponseTime: time.Time{},
}
go func() {
for {
stats.ResetResponseCounts()
time.Sleep(time.Second * 1)
}
}()
return stats
}
// ResetResponseCounts reset the response counts
func (mw *Stats) ResetResponseCounts() {
mw.mu.Lock()
defer mw.mu.Unlock()
mw.ResponseCounts = map[string]int{}
}
// Handler is a MiddlewareFunc makes Stats implement the Middleware interface.
func (mw *Stats) Handler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
beginning, recorder := mw.Begin(w)
h.ServeHTTP(recorder, r)
mw.End(beginning, recorder)
})
}
// Negroni compatible interface
func (mw *Stats) ServeHTTP(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
beginning, recorder := mw.Begin(w)
next(recorder, r)
mw.End(beginning, recorder)
}
// Begin starts a recorder
func (mw *Stats) Begin(w http.ResponseWriter) (time.Time, ResponseWriter) {
start := time.Now()
writer := NewRecorderResponseWriter(w, 200)
return start, writer
}
// EndWithStatus closes the recorder with a specific status
func (mw *Stats) EndWithStatus(start time.Time, status int) {
end := time.Now()
responseTime := end.Sub(start)
mw.mu.Lock()
defer mw.mu.Unlock()
statusCode := fmt.Sprintf("%d", status)
mw.ResponseCounts[statusCode]++
mw.TotalResponseCounts[statusCode]++
mw.TotalResponseTime = mw.TotalResponseTime.Add(responseTime)
}
// End closes the recorder with the recorder status
func (mw *Stats) End(start time.Time, recorder ResponseWriter) {
mw.EndWithStatus(start, recorder.Status())
}
// Data serializable structure
type Data struct {
Pid int `json:"pid"`
UpTime string `json:"uptime"`
UpTimeSec float64 `json:"uptime_sec"`
Time string `json:"time"`
TimeUnix int64 `json:"unixtime"`
StatusCodeCount map[string]int `json:"status_code_count"`
TotalStatusCodeCount map[string]int `json:"total_status_code_count"`
Count int `json:"count"`
TotalCount int `json:"total_count"`
TotalResponseTime string `json:"total_response_time"`
TotalResponseTimeSec float64 `json:"total_response_time_sec"`
AverageResponseTime string `json:"average_response_time"`
AverageResponseTimeSec float64 `json:"average_response_time_sec"`
}
// Data returns the data serializable structure
func (mw *Stats) Data() *Data {
mw.mu.RLock()
responseCounts := make(map[string]int, len(mw.ResponseCounts))
totalResponseCounts := make(map[string]int, len(mw.TotalResponseCounts))
now := time.Now()
uptime := now.Sub(mw.Uptime)
count := 0
for code, current := range mw.ResponseCounts {
responseCounts[code] = current
count += current
}
totalCount := 0
for code, count := range mw.TotalResponseCounts {
totalResponseCounts[code] = count
totalCount += count
}
totalResponseTime := mw.TotalResponseTime.Sub(time.Time{})
averageResponseTime := time.Duration(0)
if totalCount > 0 {
avgNs := int64(totalResponseTime) / int64(totalCount)
averageResponseTime = time.Duration(avgNs)
}
mw.mu.RUnlock()
r := &Data{
Pid: mw.Pid,
UpTime: uptime.String(),
UpTimeSec: uptime.Seconds(),
Time: now.String(),
TimeUnix: now.Unix(),
StatusCodeCount: responseCounts,
TotalStatusCodeCount: totalResponseCounts,
Count: count,
TotalCount: totalCount,
TotalResponseTime: totalResponseTime.String(),
TotalResponseTimeSec: totalResponseTime.Seconds(),
AverageResponseTime: averageResponseTime.String(),
AverageResponseTimeSec: averageResponseTime.Seconds(),
}
return r
}