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status.go
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status.go
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package rest
import (
"fmt"
"os"
"sync"
"time"
)
// statusMiddleware keeps track of various stats about the processed requests.
// It depends on request.Env["STATUS_CODE"] and request.Env["ELAPSED_TIME"]
type statusMiddleware struct {
lock sync.RWMutex
start time.Time
pid int
responseCounts map[string]int
totalResponseTime time.Time
}
func newStatusMiddleware() *statusMiddleware {
return &statusMiddleware{
start: time.Now(),
pid: os.Getpid(),
responseCounts: map[string]int{},
totalResponseTime: time.Time{},
}
}
func (mw *statusMiddleware) update(statusCode int, responseTime *time.Duration) {
mw.lock.Lock()
mw.responseCounts[fmt.Sprintf("%d", statusCode)]++
mw.totalResponseTime = mw.totalResponseTime.Add(*responseTime)
mw.lock.Unlock()
}
func (mw *statusMiddleware) MiddlewareFunc(h HandlerFunc) HandlerFunc {
return func(w ResponseWriter, r *Request) {
// call the handler
h(w, r)
mw.update(
r.Env["STATUS_CODE"].(int),
r.Env["ELAPSED_TIME"].(*time.Duration),
)
}
}
// Status contains stats and status information. It is returned by GetStatus.
// These information can be made available as an API endpoint, see the "status"
// example to install the following status route.
// GET /.status returns something like:
//
// {
// "Pid": 21732,
// "UpTime": "1m15.926272s",
// "UpTimeSec": 75.926272,
// "Time": "2013-03-04 08:00:27.152986 +0000 UTC",
// "TimeUnix": 1362384027,
// "StatusCodeCount": {
// "200": 53,
// "404": 11
// },
// "TotalCount": 64,
// "TotalResponseTime": "16.777ms",
// "TotalResponseTimeSec": 0.016777,
// "AverageResponseTime": "262.14us",
// "AverageResponseTimeSec": 0.00026214
// }
type Status struct {
Pid int
UpTime string
UpTimeSec float64
Time string
TimeUnix int64
StatusCodeCount map[string]int
TotalCount int
TotalResponseTime string
TotalResponseTimeSec float64
AverageResponseTime string
AverageResponseTimeSec float64
}
func (mw *statusMiddleware) getStatus() *Status {
mw.lock.RLock()
now := time.Now()
uptime := now.Sub(mw.start)
totalCount := 0
for _, count := range mw.responseCounts {
totalCount += count
}
totalResponseTime := mw.totalResponseTime.Sub(time.Time{})
averageResponseTime := time.Duration(0)
if totalCount > 0 {
avgNs := int64(totalResponseTime) / int64(totalCount)
averageResponseTime = time.Duration(avgNs)
}
status := &Status{
Pid: mw.pid,
UpTime: uptime.String(),
UpTimeSec: uptime.Seconds(),
Time: now.String(),
TimeUnix: now.Unix(),
StatusCodeCount: mw.responseCounts,
TotalCount: totalCount,
TotalResponseTime: totalResponseTime.String(),
TotalResponseTimeSec: totalResponseTime.Seconds(),
AverageResponseTime: averageResponseTime.String(),
AverageResponseTimeSec: averageResponseTime.Seconds(),
}
mw.lock.RUnlock()
return status
}