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package server
import (
"github.com/mimecast/dtail/internal/config"
"github.com/mimecast/dtail/internal/logger"
"fmt"
"runtime"
"sync"
"time"
)
// Used to collect and display various server stats.
type stats struct {
mutex sync.Mutex
currentConnections int
lifetimeConnections uint64
}
func (s *stats) incrementConnections() {
defer s.logServerStats()
s.mutex.Lock()
s.currentConnections++
s.lifetimeConnections++
s.mutex.Unlock()
}
func (s *stats) decrementConnections() {
defer s.logServerStats()
s.mutex.Lock()
s.currentConnections--
s.mutex.Unlock()
}
func (s *stats) hasConnections() bool {
s.mutex.Lock()
currentConnections := s.currentConnections
s.mutex.Unlock()
has := currentConnections > 0
logger.Info("stats", "Server with open connections?", has, currentConnections)
return has
}
func (s *stats) logServerStats() {
s.mutex.Lock()
defer s.mutex.Unlock()
currentConnections := fmt.Sprintf("currentConnections=%d", s.currentConnections)
lifetimeConnections := fmt.Sprintf("lifetimeConnections=%d", s.lifetimeConnections)
goroutines := fmt.Sprintf("goroutines=%d", runtime.NumGoroutine())
logger.Info("stats", currentConnections, lifetimeConnections, goroutines)
}
func (s *stats) serverLimitExceeded() error {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.currentConnections >= config.Server.MaxConnections {
return fmt.Errorf("Exceeded max allowed concurrent connections of %d", config.Server.MaxConnections)
}
return nil
}
func (s *stats) periodicLogServerStats(stop <-chan struct{}) {
for {
select {
case <-time.NewTimer(time.Second * 10).C:
s.logServerStats()
case <-stop:
return
}
}
}
func (s *stats) waitForConnections() {
for {
select {
case <-time.NewTimer(time.Second).C:
if !s.hasConnections() {
return
}
}
}
}
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