// New will mint a new Instrumentation - getting statsd connection details from the config service and then looking out
// for any changes.
func New() *Instrumentation {
ch := config.SubscribeChanges()
addr := loadStatsdAddr()
inst := &Instrumentation{
namespace: "default",
confHash: addr,
statsd: loadStatsd(addr),
registry: metrics.NewRegistry(),
savedTimers: make(map[string]metrics.Timer),
savedCounters: make(map[string]metrics.Counter),
savedGauges: make(map[string]metrics.Gauge),
launched: time.Now(),
instRuntime: false,
}
inst.StartRuntime()
// Launch listener for config changes
go func() {
for _ = range ch {
inst.mtx.Lock()
if addr := loadStatsdAddr(); addr != inst.confHash {
// @todo close old statsd here -- but no way to do this yet
inst.statsd = loadStatsd(addr)
}
inst.mtx.Unlock()
}
}()
return inst
}
func newdefaultClient() MemcacheClient {
serverSelector := new(memcache.ServerList)
client := memcache.NewFromSelector(serverSelector)
// Listen for config changes
ch := config.SubscribeChanges()
go func() {
for _ = range ch {
loadFromConfig(serverSelector, client)
}
}()
loadFromConfig(serverSelector, client)
// Log on init
hosts := config.AtPath("hailo", "service", "memcache", "servers").AsHostnameArray(11211)
operationTimeout := config.AtPath("hailo", "service", "memcache", "timeouts", "dialTimeout").
AsDuration(defaultDialTimeout)
dialTimeout := config.AtPath("hailo", "service", "memcache", "timeouts", "operationTimeout").
AsDuration(defaultOperationTimeout)
log.Infof("[Memcache] Initialising Memcache client to hosts %v: dial timeout %v, op timeout: %v", hosts,
dialTimeout, operationTimeout)
return client
}
// Try to connect, then kick off listener for config changes
func setup() {
ch := config.SubscribeChanges()
go func() {
for _ = range ch {
reconnectDefault()
}
}()
reconnectDefault()
didSetup = true
}
func init() {
// Ensure we update config when required
ch := config.SubscribeChanges()
go func() {
for {
<-ch
loadFromConfig()
}
}()
loadFromConfig()
}
// run is our main healthcheck loop
func (r *results) run() {
for {
select {
// Listen for config changes and update the healthcheck when needed
case <-config.SubscribeChanges():
// Allow healthcheck parameters to be overridden in config
config.AtPath("hailo", "platform", "healthcheck", r.hc.Id).AsStruct(r.hc)
case <-runNow:
r.collect()
case <-time.After(r.hc.Interval):
r.collect()
}
}
}
func (s *DefaultSubscriber) configLoop() {
// Wait 5 mins for config to load. If we cannot load config by the
// then there's most likely a major issue and we should panic.
if !config.WaitUntilLoaded(5 * time.Minute) {
panic("Waiting 5 mins for config to load")
}
s.loadFromConfig()
ch := config.SubscribeChanges()
for {
select {
case <-ch:
s.loadFromConfig()
case <-s.stop:
break
}
}
}
// setup is a one-time action that loads PUB hosts from config and sets up a config subscriber
func (p *HostpoolPublisher) setup() {
// Wait 5 mins for config to load. If we cannot load config by the
// then there's most likely a major issue and we should panic.
if !config.WaitUntilLoaded(5 * time.Minute) {
panic("Waiting 5 mins for config to load")
}
ch := config.SubscribeChanges()
p.loadFromConfig()
go func() {
for {
<-ch
for {
if err := p.loadFromConfig(); err != nil {
log.Warnf("Failed to load NSQ PUB config: %v", err)
time.Sleep(configRetryDelay)
} else {
break
}
}
}
}()
}
// newConfigServiceValidator initiates a validator that loads public key location from config service
func newConfigServiceValidator() validator {
v := &validatorImpl{}
v.hash = crypto.SHA1
ch := config.SubscribeChanges()
immediate := make(chan bool)
go func() {
for {
select {
case <-ch:
case <-immediate:
}
v.loadFromConfig()
}
}()
// push immediate message down to force background reload
immediate <- true
return v
}
// New will mint a new Tracer - getting phosphor connection details
// from the config service and then looking out for any changes.
func New() *Tracer {
ch := config.SubscribeChanges()
addr := loadPhosphorAddr()
tr := &Tracer{
confHash: addr,
phosphor: loadPhosphor(addr),
}
// launch listener for config changes
go func() {
for _ = range ch {
addr := loadPhosphorAddr()
tr.Lock()
if addr != tr.confHash {
tr.phosphor.Close()
tr.phosphor = loadPhosphor(addr)
}
tr.Unlock()
}
}()
return tr
}