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package clients
import (
"context"
"fmt"
"runtime"
"strings"
"sync"
"time"
"github.com/mimecast/dtail/internal/config"
"github.com/mimecast/dtail/internal/io/logger"
)
// Used to collect and display various client stats.
type stats struct {
// Total amount servers to connect to.
connectionsTotal int
// To keep track of what connected and disconnected
connectionsEstCh chan struct{}
// Amount of servers connections are established.
connected int
// To synchronize concurrent access.
mutex sync.Mutex
}
func newTailStats(connectionsTotal int) *stats {
return &stats{
connectionsTotal: connectionsTotal,
connectionsEstCh: make(chan struct{}, connectionsTotal),
connected: 0,
}
}
// Start starts printing client connection stats every time a signal is recieved or
// connection count has changed.
func (s *stats) Start(ctx context.Context, throttleCh <-chan struct{}, statsCh <-chan string, quiet bool) {
var connectedLast int
for {
var force bool
var messages []string
select {
case message := <-statsCh:
messages = append(messages, message)
force = true
case <-time.After(time.Second * 3):
case <-ctx.Done():
return
}
connected := len(s.connectionsEstCh)
throttle := len(throttleCh)
newConnections := connected - connectedLast
if (connected == connectedLast || quiet) && !force {
continue
}
stats := s.statsLine(connected, newConnections, throttle)
switch force {
case true:
messages = append(messages, fmt.Sprintf("Connection stats: %s", stats))
s.printStatsDueInterrupt(messages)
default:
logger.Info(stats)
}
connectedLast = connected
s.mutex.Lock()
s.connected = connected
s.mutex.Unlock()
}
}
func (s *stats) printStatsDueInterrupt(messages []string) {
logger.Pause()
for _, message := range messages {
fmt.Println(fmt.Sprintf(" %s", message))
}
time.Sleep(time.Second * time.Duration(config.InterruptTimeoutS))
logger.Resume()
}
func (s *stats) statsLine(connected, newConnections int, throttle int) string {
percConnected := percentOf(float64(s.connectionsTotal), float64(connected))
var stats []string
stats = append(stats, fmt.Sprintf("connected=%d/%d(%d%%)", connected, s.connectionsTotal, int(percConnected)))
stats = append(stats, fmt.Sprintf("new=%d", newConnections))
stats = append(stats, fmt.Sprintf("throttle=%d", throttle))
stats = append(stats, fmt.Sprintf("cpus/goroutines=%d/%d", runtime.NumCPU(), runtime.NumGoroutine()))
return strings.Join(stats, "|")
}
func (s *stats) numConnected() int {
s.mutex.Lock()
defer s.mutex.Unlock()
return s.connected
}
func percentOf(total float64, value float64) float64 {
if total == 0 || total == value {
return 100
}
return value / (total / 100.0)
}
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