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cluster_builder.go
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/
cluster_builder.go
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package alloycli
import (
"fmt"
stdlog "log"
"net"
"os"
"strconv"
"time"
"github.com/go-kit/log"
"github.com/grafana/alloy/internal/alloy/logging/level"
"github.com/grafana/alloy/internal/service/cluster"
"github.com/grafana/ckit/advertise"
"github.com/hashicorp/go-discover"
"github.com/hashicorp/go-discover/provider/k8s"
"github.com/prometheus/client_golang/prometheus"
"go.opentelemetry.io/otel/trace"
)
type clusterOptions struct {
Log log.Logger
Metrics prometheus.Registerer
Tracer trace.TracerProvider
EnableClustering bool
NodeName string
AdvertiseAddress string
ListenAddress string
JoinPeers []string
DiscoverPeers string
RejoinInterval time.Duration
AdvertiseInterfaces []string
ClusterMaxJoinPeers int
ClusterName string
}
func buildClusterService(opts clusterOptions) (*cluster.Service, error) {
listenPort := findPort(opts.ListenAddress, 80)
config := cluster.Options{
Log: opts.Log,
Metrics: opts.Metrics,
Tracer: opts.Tracer,
EnableClustering: opts.EnableClustering,
NodeName: opts.NodeName,
AdvertiseAddress: opts.AdvertiseAddress,
RejoinInterval: opts.RejoinInterval,
ClusterMaxJoinPeers: opts.ClusterMaxJoinPeers,
ClusterName: opts.ClusterName,
}
if config.NodeName == "" {
hostname, err := os.Hostname()
if err != nil {
return nil, fmt.Errorf("generating node name: %w", err)
}
config.NodeName = hostname
}
if config.AdvertiseAddress == "" {
advertiseAddress := fmt.Sprintf("%s:%d", net.ParseIP("127.0.0.1"), listenPort)
if opts.EnableClustering {
advertiseInterfaces := opts.AdvertiseInterfaces
if useAllInterfaces(advertiseInterfaces) {
advertiseInterfaces = nil
}
addr, err := advertise.FirstAddress(advertiseInterfaces)
if err != nil {
level.Warn(opts.Log).Log("msg", "could not find advertise address using network interfaces", opts.AdvertiseInterfaces,
"falling back to localhost", "err", err)
} else if addr.Is4() {
advertiseAddress = fmt.Sprintf("%s:%d", addr.String(), listenPort)
} else if addr.Is6() {
advertiseAddress = fmt.Sprintf("[%s]:%d", addr.String(), listenPort)
} else {
return nil, fmt.Errorf("type unknown for address: %s", addr.String())
}
}
config.AdvertiseAddress = advertiseAddress
} else {
config.AdvertiseAddress = appendDefaultPort(config.AdvertiseAddress, listenPort)
}
switch {
case len(opts.JoinPeers) > 0 && opts.DiscoverPeers != "":
return nil, fmt.Errorf("at most one of join peers and discover peers may be set")
case len(opts.JoinPeers) > 0:
config.DiscoverPeers = newStaticDiscovery(opts.JoinPeers, listenPort)
case opts.DiscoverPeers != "":
discoverFunc, err := newDynamicDiscovery(config.Log, opts.DiscoverPeers, listenPort)
if err != nil {
return nil, err
}
config.DiscoverPeers = discoverFunc
default:
// Here, both JoinPeers and DiscoverPeers are empty. This is desirable when
// starting a seed node that other nodes connect to, so we don't require
// one of the fields to be set.
}
return cluster.New(config)
}
func useAllInterfaces(interfaces []string) bool {
return len(interfaces) == 1 && interfaces[0] == "all"
}
func findPort(addr string, defaultPort int) int {
_, portStr, err := net.SplitHostPort(addr)
if err != nil {
return defaultPort
}
port, err := strconv.Atoi(portStr)
if err != nil {
return defaultPort
}
return port
}
func appendDefaultPort(addr string, port int) string {
_, _, err := net.SplitHostPort(addr)
if err == nil {
// No error means there was a port in the string
return addr
}
return fmt.Sprintf("%s:%d", addr, port)
}
type discoverFunc func() ([]string, error)
func newStaticDiscovery(peers []string, defaultPort int) discoverFunc {
return func() ([]string, error) {
var addrs []string
for _, addr := range peers {
addrs = appendJoinAddr(addrs, addr)
}
for i := range addrs {
// Default to using the same advertise port as the local node. This may
// break in some cases, so the user should make sure the port numbers
// align on as many nodes as possible.
addrs[i] = appendDefaultPort(addrs[i], defaultPort)
}
return addrs, nil
}
}
func appendJoinAddr(addrs []string, in string) []string {
_, _, err := net.SplitHostPort(in)
if err == nil {
addrs = append(addrs, in)
return addrs
}
ip := net.ParseIP(in)
if ip != nil {
addrs = append(addrs, ip.String())
return addrs
}
_, srvs, err := net.LookupSRV("", "", in)
if err == nil {
for _, srv := range srvs {
addrs = append(addrs, srv.Target)
}
}
return addrs
}
func newDynamicDiscovery(l log.Logger, config string, defaultPort int) (discoverFunc, error) {
providers := make(map[string]discover.Provider, len(discover.Providers)+1)
for k, v := range discover.Providers {
providers[k] = v
}
// Custom providers that aren't enabled by default
providers["k8s"] = &k8s.Provider{}
discoverer, err := discover.New(discover.WithProviders(providers))
if err != nil {
return nil, fmt.Errorf("bootstrapping peer discovery: %w", err)
}
return func() ([]string, error) {
addrs, err := discoverer.Addrs(config, stdlog.New(log.NewStdlibAdapter(l), "", 0))
if err != nil {
return nil, fmt.Errorf("discovering peers: %w", err)
}
for i := range addrs {
// Default to using the same advertise port as the local node. This may
// break in some cases, so the user should make sure the port numbers
// align on as many nodes as possible.
addrs[i] = appendDefaultPort(addrs[i], defaultPort)
}
return addrs, nil
}, nil
}