1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
package clients
import (
"context"
"fmt"
"runtime"
"strings"
"sync"
"time"
"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, statsCh <-chan struct{}) {
var connectedLast int
for {
var force bool
select {
case <-statsCh:
force = true
case <-time.After(time.Second * 2):
case <-ctx.Done():
return
}
connected := len(s.connectionsEstCh)
throttle := len(throttleCh)
newConnections := connected - connectedLast
if connected == connectedLast && !force {
continue
}
logger.Info(s.statsLine(connected, newConnections, throttle))
connectedLast = connected
s.mutex.Lock()
s.connected = connected
s.mutex.Unlock()
}
}
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)
}
|
