func Update() {
if _, err := database.Exec(`
INSERT OR IGNORE INTO comparison (code) SELECT code FROM new;
DELETE FROM new;
VACUUM;
`); err != nil {
fmt.Println("데이터를 정리할 수 없습니다.")
fmt.Println(err)
return
}
stmt, _ := database.Prepare("INSERT INTO comparison (code) VALUES (?)")
http.Handle("/", engine(UpdateIndexHandler))
codec := CodePool()
notifier := shutdown.First()
for {
select {
case code := <-codec:
database.Lock()
stmt.Exec(string(code))
database.Unlock()
case n := <-notifier:
stmt.Close()
close(n)
return
}
}
}
func Bloat() {
stmt, err := database.Prepare("INSERT INTO new (code) VALUES (?)")
if err != nil {
fmt.Println(err)
return
}
http.Handle("/", engine(BloatHandler))
http.Handle("/card", engine(CardHandler))
codec := CodePool()
notifier := shutdown.First()
for {
select {
case code := <-codec:
database.Lock()
stmt.Exec(string(code))
database.Unlock()
case n := <-notifier:
stmt.Close()
close(n)
return
}
}
}
// NewServer will read the supplied config file,
// and return a new server.
// A file watcher will be set up to monitor the
// configuration file and reload settings if changes
// are detected.
func NewServer(config string) (*Server, error) {
s := &Server{handler: NewReverseProxy()}
err := s.ReadConfig(config, true)
if err != nil {
return nil, err
}
// Add config file watcher/reloader.
if s.Config.WatchConfig {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return nil, err
}
err = watcher.Add(config)
if err != nil {
return nil, err
}
log.Println("Watching", config)
// We want the watcher to exit in the first stage.
go func() {
// Get a first stage shutdown notification
exit := shutdown.First()
for {
select {
// Event on config file.
case event := <-watcher.Events:
switch event.Op {
// Editor may do rename -> write -> delete, so we should not follow
// the old file
case fsnotify.Rename:
watcher.Remove(event.Name)
watcher.Add(config)
case fsnotify.Remove:
continue
}
log.Println("Reloading configuration")
err := s.ReadConfig(event.Name, false)
if err != nil {
log.Println("Error reloading configuration:", err)
log.Println("Configuration NOT applied")
} else {
log.Println("Configuration applied")
}
// Server is shutting down
case n := <-exit:
watcher.Remove(config)
close(n)
return
}
}
}()
}
return s, nil
}
// startMonitor will monitor stats of the backend
// Will at times require BOTH rt and Stats mutex.
// This means that no other goroutine should acquire
// both at the same time.
func (b *backend) startMonitor() {
s := b.rt
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
exit := shutdown.First()
end := b.closeMonitor
previous := time.Now()
for {
select {
case <-ticker.C:
elapsed := time.Now().Sub(previous)
previous = time.Now()
s.mu.Lock()
b.Stats.mu.Lock()
if s.requests == 0 {
b.Stats.Latency.Add(0)
b.Stats.FailureRate.Add(0)
} else {
b.Stats.Latency.Add(float64(s.latencySum) / float64(elapsed) / float64(s.requests))
b.Stats.FailureRate.Add(float64(s.errors) / float64(s.requests))
}
s.requests = 0
s.errors = 0
s.latencySum = 0
s.mu.Unlock()
// Perform health check
b.healthCheck()
if b.Stats.Healthy && b.Stats.healthFailures > 5 {
log.Println("5 Consequtive health tests failed. Marking as unhealty.")
b.Stats.Healthy = false
}
if !b.Stats.Healthy && b.Stats.healthFailures == 0 {
log.Println("Health check succeeded. Marking as healty")
b.Stats.Healthy = true
}
b.Stats.mu.Unlock()
case n := <-end:
exit.Cancel()
close(n)
return
case n := <-exit:
close(n)
return
}
}
}
// MonitorInventory will monitor the inventory file
// and reload the inventory if changes are detected.
// The monitor can be shut down by sending a channel on
// (Server).exitMonInv. The monitor will exit and close
// the supplied channel.
func (s *Server) MonitorInventory() error {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return err
}
file := s.Config.InventoryFile
err = watcher.Add(file)
if err != nil {
return err
}
// Create channel to stop monitoring
stop := make(chan chan struct{})
s.exitMonInv = stop
log.Println("Watching", file)
// We want the watcher to exit in the first stage.
go func() {
// Get a first stage shutdown notification
exit := shutdown.First()
for {
select {
// Event on config file.
case event := <-watcher.Events:
switch event.Op {
// Editor may do rename -> write -> delete, so we should not follow
// the old file
case fsnotify.Rename:
watcher.Remove(event.Name)
watcher.Add(file)
case fsnotify.Remove:
continue
}
log.Println("Reloading inventory")
s.mu.RLock()
bec := s.Config.Backend
s.mu.RUnlock()
inv, err := ReadInventory(event.Name, bec)
if err != nil {
log.Println("Error reloading inventory:", err)
log.Println("New inventory NOT applied")
continue
}
// Update the load balancer
s.mu.RLock()
lb, err := NewLoadBalancer(s.Config.LoadBalancing, inv)
if err != nil {
log.Println(err)
log.Println("New inventory NOT applied")
s.mu.RUnlock()
continue
}
s.handler.SetBackends(lb)
s.mu.RUnlock()
log.Println("New inventory applied")
// Server is shutting down
case n := <-exit:
log.Println("Monitor exiting")
watcher.Remove(file)
close(n)
return
// Monitor must stop
case n := <-stop:
exit.Cancel()
watcher.Remove(file)
close(n)
log.Println("No longer watching", file)
return
}
}
}()
return nil
}
