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stats.go
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stats.go
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package stats
import (
"encoding/json"
"sync/atomic"
"time"
)
// Stats maintains a set of status values for the service
type Stats struct {
startTime time.Time
numberOfCalls uint64
numberOfFailures uint64
numberOfBytesReceived uint64
numberOfBytesWritten uint64
totalResponseTimeMilliseconds uint64
}
// Output is what is returned when a stats inquiry is made of the server
type Output struct {
UpTime string
NumberOfCalls uint64
NumberOfFailures uint64
NumberOfBytesReceived uint64
NumberOfBytesWritten uint64
AvgResponseTimeMilliseconds uint64
}
// New returns a pointer to a new instance of Stats
func New() *Stats {
return &Stats{
startTime: time.Now(),
numberOfCalls: 0,
numberOfFailures: 0,
numberOfBytesReceived: 0,
numberOfBytesWritten: 0,
totalResponseTimeMilliseconds: 0,
}
}
// GetOutput returns the stats in the form of Output
func (stats *Stats) GetOutput() *Output {
numberOfCalls := atomic.LoadUint64(&stats.numberOfCalls)
numberOfFailures := atomic.LoadUint64(&stats.numberOfFailures)
numberOfBytesReceived := atomic.LoadUint64(&stats.numberOfBytesReceived)
numberOfVytesWritten := atomic.LoadUint64(&stats.numberOfBytesWritten)
avgResponseTime := uint64(0)
if numberOfCalls > 0 {
avgResponseTime = atomic.LoadUint64(&stats.totalResponseTimeMilliseconds) / numberOfCalls
}
return &Output{
UpTime: time.Since(stats.startTime).String(),
NumberOfCalls: numberOfCalls,
NumberOfFailures: numberOfFailures,
NumberOfBytesReceived: numberOfBytesReceived,
NumberOfBytesWritten: numberOfVytesWritten,
AvgResponseTimeMilliseconds: avgResponseTime,
}
}
// Bytes returns the stats in the form of a JSON series of bytes
func (stats *Stats) Bytes() []byte {
outputInstance := stats.GetOutput()
output, _ := json.Marshal(outputInstance)
return output
}
// Update takes the provide values and increments the stats values using atomic calls
func (stats *Stats) Update(WasSuccessful bool, numberOfBytesReceived uint64, numberOfBytesWritten uint64, responseTimeMilliseconds uint64) {
atomic.AddUint64(&stats.numberOfCalls, 1)
atomic.AddUint64(&stats.numberOfBytesReceived, numberOfBytesReceived)
atomic.AddUint64(&stats.numberOfBytesWritten, numberOfBytesWritten)
atomic.AddUint64(&stats.totalResponseTimeMilliseconds, responseTimeMilliseconds)
if !WasSuccessful {
atomic.AddUint64(&stats.numberOfFailures, 1)
}
}