/* TODO: Implement more probes */
func (s *Server) probe_backends(probe time.Duration) {
transport := http.Transport{Dial: dialTimeout}
client := &http.Client{
Transport: &transport,
}
for {
time.Sleep(probe)
for vhost, backends := range s.proxy {
fmt.Println(backends)
err := s.populate_proxies(vhost)
if err != nil {
utils.Log(fmt.Sprintf("Cleaned entries from vhost: %s", vhost))
continue
}
is_dead := make(map[string]bool)
removed := 0
for backend := range backends {
backend = backend - removed
utils.Log(fmt.Sprintf(
"vhost: %s backends: %s", vhost, s.proxy[vhost][backend].Backend))
if is_dead[s.proxy[vhost][backend].Backend] == true {
utils.Log(fmt.Sprintf("Removing dead backend: %s", s.proxy[vhost][backend].Backend))
s.mu.Lock()
s.proxy[vhost] = s.proxy[vhost][:backend+copy(s.proxy[vhost][backend:], s.proxy[vhost][backend+1:])]
s.vcount[vhost][s.proxy[vhost][backend].Backend]--
s.mu.Unlock()
removed++
continue
}
_, err := client.Get(s.proxy[vhost][backend].Backend)
if err != nil {
utils.Log(fmt.Sprintf("Removing dead backend: %s with error %s", s.proxy[vhost][backend].Backend, err))
is_dead[s.proxy[vhost][backend].Backend] = true
s.mu.Lock()
s.proxy[vhost] = s.proxy[vhost][:backend+copy(s.proxy[vhost][backend:], s.proxy[vhost][backend+1:])]
s.vcount[vhost][s.proxy[vhost][backend].Backend]--
s.mu.Unlock()
removed++
} else {
utils.Log(fmt.Sprintf("Alive: %s", s.proxy[vhost][backend].Backend))
}
}
}
transport.CloseIdleConnections()
}
}
// Goroutine to run a robot
func robot() {
var payload interface{}
transport := new(http.Transport)
transport.DisableKeepAlives = true
client := &http.Client{Transport: transport}
id := uuid.New()
// login
resp, err := client.PostForm(msgurl,
url.Values{"command": {"login"}, "id": {id}})
if err != nil {
log.Printf("http login error: %v", err)
return
}
body, err := ioutil.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
log.Printf("http login error: %v", err)
return
}
// extract payload
err = json.Unmarshal(body, &payload)
if err != nil {
log.Printf("json unmarshal error: %v", err)
log.Printf("json data: %s", string(body))
return
}
outerObj := payload.(map[string]interface{})
respType := outerObj["type"].(string)
// check for login errors
if respType == "status" {
status := outerObj["status"].(string)
if status == "error" {
message := outerObj["message"].(string)
log.Printf("chat server login error: %s", message)
return
}
}
// get additional user data
//publicId := outerObj["publicid"].(string)
//userName := outerObj["username"].(string)
// run the poller
go robotPoller(id)
msgCount := 0
// main loop
for {
// send chat
resp, err = client.PostForm(msgurl,
url.Values{
"command": {"broadcast"},
"id": {id},
"message": {fmt.Sprintf("message %d", msgCount)},
})
msgCount++
if err != nil {
log.Printf("http broadcast error: %v", err)
return
}
body, err = ioutil.ReadAll(resp.Body)
resp.Body.Close()
// check for broadcast errors
if respType == "status" {
status := outerObj["status"].(string)
if status == "error" {
message := outerObj["message"].(string)
log.Printf("chat server broadcast error: %s", message)
return
}
}
// sleep a bit
duration := rand.Int31n(int32(maxDelay-minDelay)) + int32(minDelay)
time.Sleep(time.Duration(duration) * time.Millisecond)
transport.CloseIdleConnections()
}
}
// Goroutine to run a long poll thread for a robot
func robotPoller(id string) {
var payload interface{}
transport := new(http.Transport)
transport.DisableKeepAlives = true
client := &http.Client{Transport: transport}
for {
// send in a poll request and wait for response
resp, err := client.PostForm(pollurl,
url.Values{"id": {id}})
if err != nil {
log.Printf("poller post error: %v", err)
return
}
//log.Printf("************** %v %v", resp, err)
body, err := ioutil.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
log.Printf("http poll request error: %v", err)
return
}
// extract payload
err = json.Unmarshal(body, &payload)
if err != nil {
log.Printf("json poll unmarshal error: %v", err)
log.Printf("json poll data: %s", string(body))
return
}
outerObj := payload.([]interface{})
for _, v := range outerObj {
message := v.(map[string]interface{})
respType := message["type"].(string)
// check for login errors
if respType == "status" {
status := message["status"].(string)
if status == "error" {
message := message["message"].(string)
log.Printf("chat server pollrequest error: %s", message)
return
}
}
// parse message
switch respType {
case "message":
//log.Printf("%s: message: %s: %s", id, message["username"].(string), message["message"].(string))
case "newuser":
//log.Printf("%s: new user: %s", id, message["username"].(string))
default:
log.Printf("%s: unknown type: %s", id, respType)
}
}
transport.CloseIdleConnections()
}
}
