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router.go
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router.go
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package app
import (
"log"
"time"
"code.cloudfoundry.org/tlsconfig"
gendiodes "code.cloudfoundry.org/go-diodes"
"code.cloudfoundry.org/loggregator-release/src/diodes"
"code.cloudfoundry.org/loggregator-release/src/metricemitter"
"code.cloudfoundry.org/loggregator-release/src/plumbing"
"code.cloudfoundry.org/loggregator-release/src/router/internal/server"
v1 "code.cloudfoundry.org/loggregator-release/src/router/internal/server/v1"
v2 "code.cloudfoundry.org/loggregator-release/src/router/internal/server/v2"
"code.cloudfoundry.org/loggregator-release/src/router/internal/sinks"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/keepalive"
)
// Router routes envelopes from producers to any subscribers.
type Router struct {
c *Config
server *server.Server
addrs Addrs
}
// NewRouter creates a new Router with the given options. Each provided
// RouterOption will manipulate the Router behavior.
func NewRouter(grpc GRPC, opts ...RouterOption) *Router {
r := &Router{
c: &Config{
GRPC: grpc,
Agent: Agent{
GRPCAddress: "127.0.0.1:3458",
},
MetricBatchIntervalMilliseconds: 5000,
},
}
for _, o := range opts {
o(r)
}
return r
}
// RouterOption is used to configure a new Router.
type RouterOption func(*Router)
// WithMetricReporting returns a RouterOption that enables Router to emit
// metrics about itself.
func WithMetricReporting(
agent Agent,
metricBatchIntervalMilliseconds uint,
sourceID string,
) RouterOption {
return func(r *Router) {
r.c.Agent = agent
r.c.MetricBatchIntervalMilliseconds = metricBatchIntervalMilliseconds
r.c.MetricSourceID = sourceID
}
}
// WithBufferSizes returns a routerOption that enables configurable
// buffer sizes
func WithBufferSizes(
ingressBufferSize int,
egressBufferSize int,
) RouterOption {
return func(r *Router) {
r.c.IngressBufferSize = ingressBufferSize
r.c.EgressBufferSize = egressBufferSize
}
}
// Start enables the Router to start receiving envelope, accepting
// subscriptions and routing data.
func (d *Router) Start() {
log.Printf("Startup: Setting up the router server")
//------------------------------
// v2 Metrics (gRPC)
//------------------------------
metricClient := initV2Metrics(d.c)
//------------------------------
// Ingress (gRPC v1 and v2)
// Egress (gRPC v1 and v2)
//------------------------------
// metric-documentation-v2: (loggregator.doppler.dropped) Number of
// envelopes dropped by the diode inbound from metron
ingressDropped := metricClient.NewCounter("dropped",
metricemitter.WithVersion(2, 0),
metricemitter.WithTags(map[string]string{"direction": "ingress"}),
)
// metric-documentation-v2: (loggregator.doppler.dropped) Number of
// envelopes dropped by the outbound diode to subscribers
droppedEgress := metricClient.NewCounter("dropped",
metricemitter.WithVersion(2, 0),
metricemitter.WithTags(map[string]string{"direction": "egress"}),
)
// metric-documentation-v2: (loggregator.doppler.ingress) Number of received
// envelopes from Metron on Doppler's v2 gRPC server
ingress := metricClient.NewCounter("ingress",
metricemitter.WithVersion(2, 0),
)
v1Buf := diodes.NewManyToOneEnvelope(d.c.IngressBufferSize, gendiodes.AlertFunc(func(missed int) {
log.Printf("Dropped %d envelopes (v1 buffer)", missed)
ingressDropped.Increment(uint64(missed))
}))
v2Buf := diodes.NewManyToOneEnvelopeV2(d.c.IngressBufferSize, gendiodes.AlertFunc(func(missed int) {
log.Printf("Dropped %d envelopes (v2 buffer)", missed)
ingressDropped.Increment(uint64(missed))
}))
// metric-documentation-v2: (loggregator.doppler.subscriptions) Number of
// active subscriptions for both V1 and V2 egress APIs.
subscriptionsMetric := metricClient.NewGauge("subscriptions", "subscriptions",
metricemitter.WithVersion(2, 0),
)
v1Ingress := v1.NewIngestorServer(
v1Buf,
v2Buf,
ingress,
)
v1Router := v1.NewRouter()
v1Egress := v1.NewDopplerServer(
v1Router,
metricClient,
droppedEgress,
subscriptionsMetric,
100*time.Millisecond,
100,
d.c.EgressBufferSize,
)
v2Ingress := v2.NewIngressServer(
v1Buf,
v2Buf,
ingress,
)
v2PubSub := v2.NewPubSub()
v2Egress := v2.NewEgressServer(
v2PubSub,
metricClient,
droppedEgress,
subscriptionsMetric,
100*time.Millisecond,
100,
)
tlsConf, err := tlsconfig.Build(
tlsconfig.WithInternalServiceDefaults(),
tlsconfig.WithIdentityFromFile(d.c.GRPC.CertFile, d.c.GRPC.KeyFile),
).Server(
tlsconfig.WithClientAuthenticationFromFile(d.c.GRPC.CAFile),
)
if len(d.c.GRPC.CipherSuites) > 0 {
opt := plumbing.WithCipherSuites(d.c.GRPC.CipherSuites)
opt(tlsConf)
}
if err != nil {
log.Panicf("Failed to create tls config for router server: %s", err)
}
srv, err := server.NewServer(
d.c.GRPC.Port,
v1Ingress,
v1Egress,
v2Ingress,
v2Egress,
grpc.Creds(credentials.NewTLS(tlsConf)),
grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
MinTime: 10 * time.Second,
PermitWithoutStream: true,
}),
grpc.MaxRecvMsgSize(10*1024*1024),
)
if err != nil {
log.Panicf("Failed to create router server: %s", err)
}
d.server = srv
d.addrs.GRPC = d.server.Addr()
//------------------------------
// Start
//------------------------------
messageRouter := sinks.NewMessageRouter(v1Router)
go messageRouter.Start(v1Buf)
repeater := v2.NewRepeater(v2PubSub.Publish, v2Buf.Next)
go repeater.Start()
go d.server.Start()
log.Print("Startup: router server started.")
}
// Addrs stores listener addresses of the router process.
type Addrs struct {
GRPC string
}
// Addrs returns a copy of the listeners' addresses.
func (d *Router) Addrs() Addrs {
return d.addrs
}
// Stop closes the gRPC listeners.
func (d *Router) Stop() {
// TODO: Drain
d.server.Stop()
}
func initV2Metrics(c *Config) *metricemitter.Client {
credentials, err := plumbing.NewClientCredentials(
c.GRPC.CertFile,
c.GRPC.KeyFile,
c.GRPC.CAFile,
"metron",
)
if err != nil {
log.Fatalf("Could not use GRPC creds for server: %s", err)
}
batchInterval := time.Duration(c.MetricBatchIntervalMilliseconds) * time.Millisecond
// metric-documentation-v2: setup function
metricClient, err := metricemitter.NewClient(
c.Agent.GRPCAddress,
metricemitter.WithGRPCDialOptions(grpc.WithTransportCredentials(credentials)),
metricemitter.WithOrigin("loggregator.doppler"),
metricemitter.WithPulseInterval(batchInterval),
metricemitter.WithSourceID(c.MetricSourceID),
)
if err != nil {
log.Fatalf("Could not configure metric emitter: %s", err)
}
return metricClient
}