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/
app_group.go
164 lines (135 loc) · 2.99 KB
/
app_group.go
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package sinks
import (
"sync"
"code.cloudfoundry.org/loggregator/metricemitter"
"github.com/cloudfoundry/sonde-go/events"
)
type Sink interface {
AppID() string
Run(<-chan *events.Envelope)
Identifier() string
}
type SinkWrapper struct {
InputChan chan<- *events.Envelope
Sink Sink
}
type AppGroup struct {
mu sync.RWMutex
wrappers map[string]*SinkWrapper
droppedMetric *metricemitter.Counter
errorMetric *metricemitter.Counter
}
func NewAppGroup(
droppedMetric *metricemitter.Counter,
errorMetric *metricemitter.Counter,
) *AppGroup {
return &AppGroup{
wrappers: make(map[string]*SinkWrapper),
droppedMetric: droppedMetric,
errorMetric: errorMetric,
}
}
func (g *AppGroup) AddSink(sink Sink, in chan<- *events.Envelope) bool {
g.mu.Lock()
defer g.mu.Unlock()
if g.exists(sink) {
return false
}
g.wrappers[sink.Identifier()] = &SinkWrapper{
InputChan: in,
Sink: sink,
}
return true
}
func (g *AppGroup) Exists(sink Sink) bool {
g.mu.RLock()
defer g.mu.RUnlock()
return g.exists(sink)
}
// exists needs to be called with read or write lock held.
func (g *AppGroup) exists(sink Sink) bool {
w, ok := g.wrappers[sink.Identifier()]
return ok && w != nil
}
func (g *AppGroup) Sink(id string) Sink {
g.mu.RLock()
defer g.mu.RUnlock()
return g.sink(id)
}
func (g *AppGroup) RecentLogsSink(id string) *DumpSink {
g.mu.RLock()
defer g.mu.RUnlock()
dump, ok := g.sink(id).(*DumpSink)
if !ok {
return nil
}
return dump
}
// sink needs to be called with read or write lock held.
func (g *AppGroup) sink(id string) Sink {
wrapper, ok := g.wrappers[id]
if !ok || wrapper == nil {
return nil
}
return wrapper.Sink
}
func (g *AppGroup) RemoveSink(sink Sink) bool {
g.mu.Lock()
defer g.mu.Unlock()
return g.removeSink(sink)
}
func (g *AppGroup) RemoveAllSinks() {
g.mu.Lock()
defer g.mu.Unlock()
for _, wrapper := range g.wrappers {
if wrapper == nil {
continue
}
g.removeSink(wrapper.Sink)
}
}
// removeSink needs to be called with write lock held.
func (g *AppGroup) removeSink(sink Sink) bool {
wrapper, ok := g.wrappers[sink.Identifier()]
delete(g.wrappers, sink.Identifier())
if !ok || wrapper == nil {
return false
}
close(wrapper.InputChan)
return true
}
func (g *AppGroup) IsEmpty() bool {
g.mu.RLock()
defer g.mu.RUnlock()
return len(g.wrappers) == 0
}
func (g *AppGroup) BroadcastMessage(msg *events.Envelope) {
g.mu.RLock()
defer g.mu.RUnlock()
for _, wrapper := range g.wrappers {
if wrapper == nil {
continue
}
select {
case wrapper.InputChan <- msg:
default:
// metric-documentation-v2: (loggregator.doppler.sinks.dropped)
// Number of envelopes dropped while inserting envelope into sink.
g.droppedMetric.Increment(1)
}
}
}
func (g *AppGroup) BroadcastError(msg *events.Envelope) {
g.mu.RLock()
defer g.mu.RUnlock()
for _, wrapper := range g.wrappers {
if wrapper == nil {
continue
}
}
}
func (g *AppGroup) length() int {
g.mu.RLock()
defer g.mu.RUnlock()
return len(g.wrappers)
}