// Note the OpsConfigManager is in charge of the httpServer, because ops config changes trigger server changes. If other things needed to trigger server restarts, the server could be put in its own goroutine with signal channels
func StartOpsConfigManager(opsConfigFile string, dr chan<- http_server.DataRequest, toSession towrap.ITrafficOpsSession, toData todata.TODataThreadsafe, opsConfigChangeSubscribers []chan<- handler.OpsConfig, toChangeSubscribers []chan<- towrap.ITrafficOpsSession) OpsConfigThreadsafe {
opsConfigFileChannel := make(chan interface{})
opsConfigFilePoller := poller.FilePoller{
File: opsConfigFile,
ResultChannel: opsConfigFileChannel,
}
opsConfigChannel := make(chan handler.OpsConfig)
opsConfigFileHandler := handler.OpsConfigFileHandler{
ResultChannel: opsConfigFilePoller.ResultChannel,
OpsConfigChannel: opsConfigChannel,
}
go opsConfigFileHandler.Listen()
go opsConfigFilePoller.Poll()
opsConfig := NewOpsConfigThreadsafe()
go opsConfigManagerListen(opsConfig, opsConfigChannel, dr, toSession, toData, opsConfigChangeSubscribers, toChangeSubscribers)
return opsConfig
}
// Note the OpsConfigManager is in charge of the httpServer, because ops config changes trigger server changes. If other things needed to trigger server restarts, the server could be put in its own goroutine with signal channels
func StartOpsConfigManager(
opsConfigFile string,
toSession towrap.ITrafficOpsSession,
toData todata.TODataThreadsafe,
opsConfigChangeSubscribers []chan<- handler.OpsConfig,
toChangeSubscribers []chan<- towrap.ITrafficOpsSession,
localStates peer.CRStatesThreadsafe,
peerStates peer.CRStatesPeersThreadsafe,
combinedStates peer.CRStatesThreadsafe,
statHistory StatHistoryThreadsafe,
lastStats LastStatsThreadsafe,
dsStats DSStatsThreadsafe,
events EventsThreadsafe,
staticAppData StaticAppData,
healthPollInterval time.Duration,
lastHealthDurations DurationMapThreadsafe,
fetchCount UintThreadsafe,
healthIteration UintThreadsafe,
errorCount UintThreadsafe,
localCacheStatus CacheAvailableStatusThreadsafe,
unpolledCaches UnpolledCachesThreadsafe,
) OpsConfigThreadsafe {
opsConfigFileChannel := make(chan interface{})
opsConfigFilePoller := poller.FilePoller{
File: opsConfigFile,
ResultChannel: opsConfigFileChannel,
}
opsConfigChannel := make(chan handler.OpsConfig)
opsConfigFileHandler := handler.OpsConfigFileHandler{
ResultChannel: opsConfigFilePoller.ResultChannel,
OpsConfigChannel: opsConfigChannel,
}
go opsConfigFileHandler.Listen()
go opsConfigFilePoller.Poll()
opsConfig := NewOpsConfigThreadsafe()
// TODO remove change subscribers, give Threadsafes directly to the things that need them. If they only set vars, and don't actually do work on change.
go func() {
httpServer := http_server.Server{}
for {
select {
case newOpsConfig := <-opsConfigChannel:
var err error
opsConfig.Set(newOpsConfig)
listenAddress := ":80" // default
if newOpsConfig.HttpListener != "" {
listenAddress = newOpsConfig.HttpListener
}
handleErr := func(err error) {
errorCount.Inc()
log.Errorf("OpsConfigManager: %v\n", err)
}
err = httpServer.Run(func(req http_server.DataRequest) ([]byte, int) {
return DataRequest(
req,
opsConfig,
toSession,
localStates,
peerStates,
combinedStates,
statHistory,
dsStats,
events,
staticAppData,
healthPollInterval,
lastHealthDurations,
fetchCount,
healthIteration,
errorCount,
toData,
localCacheStatus,
lastStats,
unpolledCaches,
)
}, listenAddress)
if err != nil {
handleErr(fmt.Errorf("MonitorConfigPoller: error creating HTTP server: %s\n", err))
continue
}
realToSession, err := to.Login(newOpsConfig.Url, newOpsConfig.Username, newOpsConfig.Password, newOpsConfig.Insecure)
if err != nil {
handleErr(fmt.Errorf("MonitorConfigPoller: error instantiating Session with traffic_ops: %s\n", err))
continue
}
toSession.Set(realToSession)
if err := toData.Fetch(toSession, newOpsConfig.CdnName); err != nil {
handleErr(fmt.Errorf("Error getting Traffic Ops data: %v\n", err))
continue
}
// These must be in a goroutine, because the monitorConfigPoller tick sends to a channel this select listens for. Thus, if we block on sends to the monitorConfigPoller, we have a livelock race condition.
// More generically, we're using goroutines as an infinite chan buffer, to avoid potential livelocks
for _, subscriber := range opsConfigChangeSubscribers {
go func() {
subscriber <- newOpsConfig // this is needed for cdnName
}()
}
for _, subscriber := range toChangeSubscribers {
go func() {
subscriber <- toSession
}()
}
}
}
}()
return opsConfig
}
//
// Kicks off the pollers and handlers
//
func Start(opsConfigFile string, staticAppData StaticAppData) {
var toSession *traffic_ops.Session
fetchSuccessCounter := gmx.NewCounter("fetchSuccess")
fetchFailCounter := gmx.NewCounter("fetchFail")
fetchPendingGauge := gmx.NewGauge("fetchPending")
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
sharedClient := http.Client{
Timeout: defaultHttpTimeout,
Transport: tr,
}
cacheHealthConfigChannel := make(chan poller.HttpPollerConfig)
cacheHealthChannel := make(chan cache.Result)
cacheHealthTick := make(chan uint64)
cacheHealthPoller := poller.HttpPoller{
TickChan: cacheHealthTick,
ConfigChannel: cacheHealthConfigChannel,
Config: poller.HttpPollerConfig{
Interval: defaultCacheHealthPollingInterval,
},
Fetcher: fetcher.HttpFetcher{
Handler: cache.Handler{ResultChannel: cacheHealthChannel},
Client: sharedClient,
Success: fetchSuccessCounter,
Fail: fetchFailCounter,
Pending: fetchPendingGauge,
},
}
cacheStatConfigChannel := make(chan poller.HttpPollerConfig)
cacheStatChannel := make(chan cache.Result)
cacheStatPoller := poller.HttpPoller{
ConfigChannel: cacheStatConfigChannel,
Config: poller.HttpPollerConfig{
Interval: defaultCacheStatPollingInterval,
},
Fetcher: fetcher.HttpFetcher{
Handler: cache.Handler{ResultChannel: cacheStatChannel},
Client: sharedClient,
Success: fetchSuccessCounter,
Fail: fetchFailCounter,
Pending: fetchPendingGauge,
},
}
sessionChannel := make(chan *traffic_ops.Session)
monitorConfigChannel := make(chan traffic_ops.TrafficMonitorConfigMap)
monitorOpsConfigChannel := make(chan handler.OpsConfig)
monitorConfigPoller := poller.MonitorConfigPoller{
Interval: defaultMonitorConfigPollingInterval,
SessionChannel: sessionChannel,
ConfigChannel: monitorConfigChannel,
OpsConfigChannel: monitorOpsConfigChannel,
}
opsConfigFileChannel := make(chan interface{})
opsConfigFilePoller := poller.FilePoller{
File: opsConfigFile,
ResultChannel: opsConfigFileChannel,
}
opsConfigChannel := make(chan handler.OpsConfig)
opsConfigFileHandler := handler.OpsConfigFileHandler{
ResultChannel: opsConfigFilePoller.ResultChannel,
OpsConfigChannel: opsConfigChannel,
}
peerConfigChannel := make(chan poller.HttpPollerConfig)
peerChannel := make(chan peer.Result)
peerPoller := poller.HttpPoller{
ConfigChannel: peerConfigChannel,
Config: poller.HttpPollerConfig{
Interval: defaultPeerPollingInterval,
},
Fetcher: fetcher.HttpFetcher{
Handler: peer.Handler{ResultChannel: peerChannel},
Client: sharedClient,
Success: fetchSuccessCounter,
Fail: fetchFailCounter,
Pending: fetchPendingGauge,
},
}
go opsConfigFileHandler.Listen()
go opsConfigFilePoller.Poll()
go monitorConfigPoller.Poll()
go cacheHealthPoller.Poll()
go cacheStatPoller.Poll()
go peerPoller.Poll()
dr := make(chan http_server.DataRequest)
healthHistory := make(map[string][]interface{})
statHistory := make(map[string][]interface{})
var opsConfig handler.OpsConfig
var monitorConfig traffic_ops.TrafficMonitorConfigMap
localStates := peer.Crstates{Caches: make(map[string]peer.IsAvailable), Deliveryservice: make(map[string]peer.Deliveryservice)} // this is the local state as discoverer by this traffic_monitor
peerStates := make(map[string]peer.Crstates) // each peer's last state is saved in this map
combinedStates := peer.Crstates{Caches: make(map[string]peer.IsAvailable), Deliveryservice: make(map[string]peer.Deliveryservice)} // this is the result of combining the localStates and all the peerStates using the var ??
deliveryServiceServers := map[string][]string{}
serverTypes := map[string]string{}
// TODO put stat data in a struct, for brevity
lastHealthEndTimes := map[string]time.Time{}
lastHealthDurations := map[string]time.Duration{}
fetchCount := uint64(0) // note this is the number of individual caches fetched from, not the number of times all the caches were polled.
healthIteration := uint64(0)
errorCount := uint64(0)
events := []Event{}
eventIndex := uint64(0)
for {
select {
case req := <-dr:
defer close(req.C)
var body []byte
var err error
switch req.T {
case http_server.TR_CONFIG:
if toSession != nil && opsConfig.CdnName != "" {
body, err = toSession.CRConfigRaw(opsConfig.CdnName)
}
case http_server.TR_STATE_DERIVED:
body, err = peer.CrStatesMarshall(combinedStates)
case http_server.TR_STATE_SELF:
body, err = peer.CrStatesMarshall(localStates)
case http_server.CACHE_STATS:
// TODO: add support for ?hc=N query param, stats=, wildcard, individual caches
// add pp and date to the json:
/*
pp: "0=[my-ats-edge-cache-1], hc=[1]",
date: "Thu Oct 09 20:28:36 UTC 2014"
*/
params := req.Parameters
hc := 1
if _, exists := params["hc"]; exists {
v, err := strconv.Atoi(params["hc"][0])
if err == nil {
hc = v
}
}
body, err = cache.StatsMarshall(statHistory, hc)
case http_server.DS_STATS:
body = []byte("TODO implement")
case http_server.EVENT_LOG:
body, err = json.Marshal(JSONEvents{Events: events})
case http_server.PEER_STATES:
body = []byte("TODO implement")
case http_server.STAT_SUMMARY:
body = []byte("TODO implement")
case http_server.STATS:
body, err = getStats(staticAppData, cacheHealthPoller.Config.Interval, lastHealthDurations, fetchCount, healthIteration, errorCount)
if err != nil {
// TODO send error to client
errorCount++
log.Printf("ERROR getting stats %v\n", err)
continue
}
case http_server.CONFIG_DOC:
opsConfigCopy := opsConfig
// if the password is blank, leave it blank, so callers can see it's missing.
if opsConfigCopy.Password != "" {
opsConfigCopy.Password = "******"
}
body, err = json.Marshal(opsConfigCopy)
default:
body = []byte("TODO error message")
}
req.C <- body
case oc := <-opsConfigFileHandler.OpsConfigChannel:
var err error
opsConfig = oc
listenAddress := ":80" // default
if opsConfig.HttpListener != "" {
listenAddress = opsConfig.HttpListener
}
err = http_server.Run(dr, listenAddress)
if err != nil {
errorCount++
log.Printf("MonitorConfigPoller: error creating HTTP server: %s\n", err)
continue
}
toSession, err = traffic_ops.Login(opsConfig.Url, opsConfig.Username, opsConfig.Password, opsConfig.Insecure)
if err != nil {
errorCount++
log.Printf("MonitorConfigPoller: error instantiating Session with traffic_ops: %s\n", err)
continue
}
deliveryServiceServers, err = getDeliveryServiceServers(toSession, opsConfig.CdnName)
if err != nil {
errorCount++
log.Printf("Error getting delivery service servers from Traffic Ops: %v\n", err)
continue
}
serverTypes, err = getServerTypes(toSession, opsConfig.CdnName)
if err != nil {
errorCount++
log.Printf("Error getting server types from Traffic Ops: %v\n", err)
continue
}
// This must be in a goroutine, because the monitorConfigPoller tick sends to a channel this select listens for. Thus, if we block on sends to the monitorConfigPoller, we have a livelock race condition.
go func() {
monitorConfigPoller.OpsConfigChannel <- opsConfig // this is needed for cdnName
monitorConfigPoller.SessionChannel <- toSession
}()
case monitorConfig = <-monitorConfigPoller.ConfigChannel:
healthUrls := map[string]string{}
statUrls := map[string]string{}
peerUrls := map[string]string{}
caches := map[string]string{}
for _, srv := range monitorConfig.TrafficServer {
caches[srv.HostName] = srv.Status
if srv.Status == "ONLINE" {
localStates.Caches[srv.HostName] = peer.IsAvailable{IsAvailable: true}
continue
}
if srv.Status == "OFFLINE" {
localStates.Caches[srv.HostName] = peer.IsAvailable{IsAvailable: false}
continue
}
// seed states with available = false until our polling cycle picks up a result
if _, exists := localStates.Caches[srv.HostName]; !exists {
localStates.Caches[srv.HostName] = peer.IsAvailable{IsAvailable: false}
}
url := monitorConfig.Profile[srv.Profile].Parameters.HealthPollingURL
r := strings.NewReplacer(
"${hostname}", srv.FQDN,
"${interface_name}", srv.InterfaceName,
"application=system", "application=plugin.remap",
"application=", "application=plugin.remap",
)
url = r.Replace(url)
healthUrls[srv.HostName] = url
r = strings.NewReplacer("application=plugin.remap", "application=")
url = r.Replace(url)
statUrls[srv.HostName] = url
}
for _, srv := range monitorConfig.TrafficMonitor {
if srv.Status != "ONLINE" {
continue
}
// TODO: the URL should be config driven. -jse
url := fmt.Sprintf("http://%s:%d/publish/CrStates?raw", srv.IP, srv.Port)
peerUrls[srv.HostName] = url
}
cacheStatPoller.ConfigChannel <- poller.HttpPollerConfig{Urls: statUrls, Interval: defaultCacheStatPollingInterval}
cacheHealthPoller.ConfigChannel <- poller.HttpPollerConfig{Urls: healthUrls, Interval: defaultCacheHealthPollingInterval}
peerPoller.ConfigChannel <- poller.HttpPollerConfig{Urls: peerUrls, Interval: defaultPeerPollingInterval}
for k := range localStates.Caches {
_, exists := monitorConfig.TrafficServer[k]
if !exists {
fmt.Printf("Warning: removing %s from localStates", k)
delete(localStates.Caches, k)
}
}
addStateDeliveryServices(monitorConfig, localStates.Deliveryservice)
case i := <-cacheHealthTick:
healthIteration = i
case healthResult := <-cacheHealthChannel:
fetchCount++
var prevResult cache.Result
if len(healthHistory[healthResult.Id]) != 0 {
prevResult = healthHistory[healthResult.Id][len(healthHistory[healthResult.Id])-1].(cache.Result)
}
health.GetVitals(&healthResult, &prevResult, &monitorConfig)
healthHistory[healthResult.Id] = pruneHistory(append(healthHistory[healthResult.Id], healthResult), defaultMaxHistory)
isAvailable, whyAvailable := health.EvalCache(healthResult, &monitorConfig)
if localStates.Caches[healthResult.Id].IsAvailable != isAvailable {
fmt.Println("Changing state for", healthResult.Id, " was:", prevResult.Available, " is now:", isAvailable, " because:", whyAvailable, " errors:", healthResult.Errors)
e := Event{
Index: eventIndex,
Time: time.Now().Unix(),
Description: whyAvailable,
Name: healthResult.Id,
Hostname: healthResult.Id,
Type: serverTypes[healthResult.Id],
Available: isAvailable,
}
events = append([]Event{e}, events...)
if len(events) > maxEvents {
events = events[:maxEvents-1]
}
eventIndex++
}
localStates.Caches[healthResult.Id] = peer.IsAvailable{IsAvailable: isAvailable}
calculateDeliveryServiceState(deliveryServiceServers, localStates.Caches, localStates.Deliveryservice)
if lastHealthStart, ok := lastHealthEndTimes[healthResult.Id]; ok {
lastHealthDurations[healthResult.Id] = time.Since(lastHealthStart)
}
lastHealthEndTimes[healthResult.Id] = time.Now()
// if _, ok := queryIntervalStart[pollI]; !ok {
// log.Printf("ERROR poll start index not found")
// continue
// }
// lastQueryIntervalTime = time.Since(queryIntervalStart[pollI])
case stats := <-cacheStatChannel:
statHistory[stats.Id] = pruneHistory(append(statHistory[stats.Id], stats), defaultMaxHistory)
case crStatesResult := <-peerChannel:
peerStates[crStatesResult.Id] = crStatesResult.PeerStats
combinedStates = combineCrStates(peerStates, localStates)
}
}
}