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main.go
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main.go
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package main
import (
"crypto/tls"
"flag"
"fmt"
"log"
"net"
"net/http"
"os"
"strconv"
"strings"
"time"
"context"
"contrib.go.opencensus.io/exporter/zipkin"
"github.com/childoftheuniverse/etcd-discovery/exporter"
"github.com/childoftheuniverse/filesystem"
_ "github.com/childoftheuniverse/filesystem-file"
rados "github.com/childoftheuniverse/filesystem-rados"
"github.com/childoftheuniverse/red-cloud"
"github.com/childoftheuniverse/tlsconfig"
openzipkin "github.com/openzipkin/zipkin-go"
openzipkinModel "github.com/openzipkin/zipkin-go/model"
zipkinReporter "github.com/openzipkin/zipkin-go/reporter"
zipkinHTTP "github.com/openzipkin/zipkin-go/reporter/http"
"github.com/prometheus/client_golang/prometheus/promhttp"
etcd "go.etcd.io/etcd/clientv3"
"go.opencensus.io/trace"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
func main() {
var portExporter *exporter.ServiceExporter
var etcdServers, instanceName, thisHost, hostName string
var radosConfig, radosCluster, radosUser string
var wantRados bool
var ourAddr, statusAddr *net.TCPAddr
var rangeRegistry *ServingRangeRegistry
var statusServer *StatusWebService
var dns *DataNodeService
var ms *DataNodeMetadataService
var etcdClient *etcd.Client
var etcdTimeout time.Duration
var etcdConfig etcd.Config
var etcdTLSConfig *tls.Config
var etcdCA string
var srv *grpc.Server
var maxMsgSize int
var privateKeyPath string
var certificatePath string
var caPath string
var tlsConfig *tls.Config
var grpcOptions []grpc.ServerOption
var l, sl net.Listener
var startupWait time.Duration
var startupDeadline time.Time
var bootstrapCSSPath, bootstrapCSSHash string
var exportPort bool
var etcdTTL int64
var port, statusPort int
var zipkinEndpoint string
var err error
if thisHost, err = os.Hostname(); err != nil {
log.Printf("Warning: cannot determine host name: %s", err)
}
flag.StringVar(&etcdServers, "etcd-servers", "",
"List of etcd servers to connect to")
flag.DurationVar(&etcdTimeout, "etcd-timeout", 30*time.Second,
"Timeout for etcd connection")
flag.StringVar(&zipkinEndpoint, "zipkin-endpoint",
fmt.Sprintf("%s:9411", thisHost),
"host:port pair to send Zipkin traces to")
flag.StringVar(&instanceName, "instance", "test",
"Name of the red-cloud instance being run")
flag.StringVar(&hostName, "host", thisHost,
"Externally available name of this host")
flag.IntVar(&port, "port", 0, "Specific port to bind to, if possible")
flag.IntVar(&statusPort, "status-port", 0,
"Port to use for exporting status information")
flag.IntVar(&maxMsgSize, "max-msg-size", 512*1048576,
"Maximum size of RPC messages received")
flag.BoolVar(&exportPort, "export-port", false,
"Export the RPC port to etcd as an exported service")
flag.Int64Var(&etcdTTL, "etcd-ttl", 30,
"Number of seconds the etcd exported service will stick around "+
"without being renewed. Must be greater than or equal to 5")
flag.StringVar(&etcdCA, "etcd-ca", "",
"Use a separate CA for etcd only. If unset, use the value from --ca")
flag.DurationVar(&startupWait, "startup-deadline", 20*time.Second,
"Number of seconds to wait on remote operations during startup")
flag.StringVar(&bootstrapCSSPath, "bootstrap-css",
"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css",
"URL to import the bootstrap CSS from")
flag.StringVar(&bootstrapCSSHash, "bootstrap-css-hash",
"sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u",
"Hash to verify the integrity of the bootstrap CSS hash")
// TLS authentication settings.
flag.StringVar(&privateKeyPath, "private-key", "",
"Path to the TLS private key file (PEM format). Empty disables TLS.")
flag.StringVar(&certificatePath, "server-certificate", "",
"Path to the TLS server certificate file (PEM format). Empty disables TLS.")
flag.StringVar(&caPath, "ca", "",
"Path to the TLS CA certificate file (PEM format). "+
"Empty disables client authentication.")
// Rados specific configuration flags.
flag.StringVar(&radosConfig, "datanode-rados-config", "",
"Path to a Rados client configuration file. If unset, the default file "+
"will be read")
flag.StringVar(&radosCluster, "datanode-rados-cluster", "",
"Name of the Rados cluster in the configuration file to use")
flag.StringVar(&radosUser, "datanode-rados-user", "",
"Name of the user to use for accessing Rados")
flag.BoolVar(&wantRados, "want-rados", false,
"Fail startup if Rados cannot be configured")
flag.Parse()
startupDeadline = time.Now().Add(startupWait)
if certificatePath != "" && privateKeyPath != "" && caPath != "" {
if tlsConfig, err = tlsconfig.TLSConfigWithRootAndClientCAAndCert(
caPath, caPath, certificatePath, privateKeyPath); err != nil {
log.Fatal("Unable to initialize TLS context: ", err)
}
}
if etcdCA != "" {
if etcdTLSConfig, err = tlsconfig.TLSConfigWithRootCAAndCert(
etcdCA, certificatePath, privateKeyPath); err != nil {
log.Fatal("Unable to initialize TLS context for etcd: ", err)
}
} else if tlsConfig != nil {
etcdTLSConfig = tlsConfig
}
etcdConfig.Endpoints = strings.Split(etcdServers, ",")
etcdConfig.DialTimeout = etcdTimeout
if etcdTLSConfig != nil {
etcdConfig.TLS = etcdTLSConfig
}
// Connect to etcd.
if etcdClient, err = etcd.New(etcdConfig); err != nil {
log.Fatalf("Cannot connect to etcd %s: %s", etcdServers, err)
}
defer etcdClient.Close()
// Check for a request to set up Rados in a non-default way.
if radosConfig != "" {
if radosUser != "" {
if radosCluster != "" {
err = rados.RegisterRadosConfigWithClusterAndUser(
radosConfig, radosCluster, radosUser)
} else {
err = rados.RegisterRadosConfigWithUser(radosConfig, radosUser)
}
} else {
err = rados.RegisterRadosConfig(radosConfig)
}
if err != nil {
log.Print("Error initializing Rados client: ", err)
}
}
if wantRados && !filesystem.HasImplementation("rados") {
log.Fatal("Rados requested but Rados initialization failed")
}
// Set up local RPC server to listen on.
if exportPort {
var ctx context.Context
var listenTo string
ctx, _ = context.WithDeadline(context.Background(), startupDeadline)
if portExporter, err = exporter.NewExporterFromClient(
ctx, etcdClient, etcdClient, etcdTTL); err != nil {
log.Fatal("Cannot create etcd port exporter: ", err)
}
if statusPort > 0 {
listenTo = net.JoinHostPort(
hostName, strconv.Itoa(statusPort))
} else {
listenTo = hostName
}
if sl, err = portExporter.NewExportedPort(ctx, "tcp", listenTo,
"red-cloud/"+instanceName+"/data-node-status"); err != nil {
log.Fatalf("Cannot establish exported TCP listener on %s:%d: %s",
hostName, statusPort, err)
}
statusAddr = sl.Addr().(*net.TCPAddr)
if port > 0 {
listenTo = net.JoinHostPort(hostName, strconv.Itoa(port))
} else {
listenTo = hostName
}
if l, err = portExporter.NewExportedPort(ctx, "tcp", listenTo,
"red-cloud/"+instanceName+"/data-node"); err != nil {
log.Fatalf("Cannot establish exported TCP listener on %s:%d: %s",
hostName, port, err)
}
ourAddr = l.Addr().(*net.TCPAddr)
} else {
if statusAddr, err = net.ResolveTCPAddr(
"tcp",
net.JoinHostPort(hostName, strconv.Itoa(statusPort))); err != nil {
log.Fatalf("Cannot determine what to do with %s:%d: %s",
hostName, statusPort, err)
}
if sl, err = net.ListenTCP("tcp", statusAddr); err != nil {
log.Fatalf("Cannot establish TCP listener on %s:%d: %s", hostName,
statusPort, err)
}
statusAddr = sl.Addr().(*net.TCPAddr)
if ourAddr, err = net.ResolveTCPAddr(
"tcp", net.JoinHostPort(hostName, strconv.Itoa(port))); err != nil {
log.Fatalf("Cannot determine what to do with %s:%d: %s",
hostName, port, err)
}
if l, err = net.ListenTCP("tcp", ourAddr); err != nil {
log.Fatalf("Cannot establish TCP listener on %s:%d: %s", hostName,
port, err)
}
ourAddr = l.Addr().(*net.TCPAddr)
}
if zipkinEndpoint != "" {
var localEndpoint *openzipkinModel.Endpoint
var reporter zipkinReporter.Reporter
var zipkinExporter trace.Exporter
localEndpoint, err = openzipkin.NewEndpoint(
fmt.Sprintf("red-cloud-datanode-%s", instanceName),
net.JoinHostPort(hostName, strconv.Itoa(statusPort)))
if err != nil {
log.Fatalf("Failed to create the local zipkin endpoint: %s", err)
}
reporter = zipkinHTTP.NewReporter(fmt.Sprintf("http://%s/api/v2/spans",
zipkinEndpoint))
zipkinExporter = zipkin.NewExporter(reporter, localEndpoint)
trace.RegisterExporter(zipkinExporter)
}
rangeRegistry = NewServingRangeRegistry(
instanceName, ourAddr.IP.String(), uint16(ourAddr.Port), etcdClient)
statusServer = NewStatusWebService(
bootstrapCSSPath, bootstrapCSSHash, rangeRegistry)
ms = NewDataNodeMetadataService(rangeRegistry, uint16(statusAddr.Port))
dns = NewDataNodeService(rangeRegistry)
http.Handle("/", statusServer)
http.Handle("/metrics", promhttp.Handler())
go http.Serve(sl, nil)
grpcOptions = append(grpcOptions, grpc.MaxMsgSize(maxMsgSize))
if tlsConfig != nil {
grpcOptions = append(grpcOptions, grpc.Creds(credentials.NewTLS(tlsConfig)))
}
srv = grpc.NewServer(grpcOptions...)
redcloud.RegisterDataNodeMetadataServiceServer(srv, ms)
redcloud.RegisterDataNodeServiceServer(srv, dns)
if err = srv.Serve(l); err != nil {
log.Fatalf("Error listening to %s: %s", l.Addr(), err)
}
}