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// Copyright (C) 2018 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package main
import (
"context"
"crypto/tls"
"flag"
"log"
"net"
"net/http"
"os"
"runtime"
"strings"
"time"
"github.com/prometheus/client_golang/prometheus/promhttp"
_ "github.com/syncthing/syncthing/lib/automaxprocs"
"github.com/syncthing/syncthing/lib/build"
"github.com/syncthing/syncthing/lib/protocol"
"github.com/syncthing/syncthing/lib/tlsutil"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/thejerf/suture/v4"
)
const (
addressExpiryTime = 2 * time.Hour
databaseStatisticsInterval = 5 * time.Minute
// Reannounce-After is set to reannounceAfterSeconds +
// random(reannounzeFuzzSeconds), similar for Retry-After
reannounceAfterSeconds = 3300
reannounzeFuzzSeconds = 300
errorRetryAfterSeconds = 1500
errorRetryFuzzSeconds = 300
// Retry for not found is minSeconds + failures * incSeconds +
// random(fuzz), where failures is the number of consecutive lookups
// with no answer, up to maxSeconds. The fuzz is applied after capping
// to maxSeconds.
notFoundRetryMinSeconds = 60
notFoundRetryMaxSeconds = 3540
notFoundRetryIncSeconds = 10
notFoundRetryFuzzSeconds = 60
// How often (in requests) we serialize the missed counter to database.
notFoundMissesWriteInterval = 10
httpReadTimeout = 5 * time.Second
httpWriteTimeout = 5 * time.Second
httpMaxHeaderBytes = 1 << 10
// Size of the replication outbox channel
replicationOutboxSize = 10000
)
// These options make the database a little more optimized for writes, at
// the expense of some memory usage and risk of losing writes in a (system)
// crash.
var levelDBOptions = &opt.Options{
NoSync: true,
WriteBuffer: 32 << 20, // default 4<<20
}
var debug = false
func main() {
var listen string
var dir string
var metricsListen string
var replicationListen string
var replicationPeers string
var certFile string
var keyFile string
var replCertFile string
var replKeyFile string
var useHTTP bool
var largeDB bool
log.SetOutput(os.Stdout)
log.SetFlags(0)
flag.StringVar(&certFile, "cert", "./cert.pem", "Certificate file")
flag.StringVar(&keyFile, "key", "./key.pem", "Key file")
flag.StringVar(&dir, "db-dir", "./discovery.db", "Database directory")
flag.BoolVar(&debug, "debug", false, "Print debug output")
flag.BoolVar(&useHTTP, "http", false, "Listen on HTTP (behind an HTTPS proxy)")
flag.StringVar(&listen, "listen", ":8443", "Listen address")
flag.StringVar(&metricsListen, "metrics-listen", "", "Metrics listen address")
flag.StringVar(&replicationPeers, "replicate", "", "Replication peers, id@address, comma separated")
flag.StringVar(&replicationListen, "replication-listen", ":19200", "Replication listen address")
flag.StringVar(&replCertFile, "replication-cert", "", "Certificate file for replication")
flag.StringVar(&replKeyFile, "replication-key", "", "Key file for replication")
flag.BoolVar(&largeDB, "large-db", false, "Use larger database settings")
showVersion := flag.Bool("version", false, "Show version")
flag.Parse()
log.Println(build.LongVersionFor("stdiscosrv"))
if *showVersion {
return
}
buildInfo.WithLabelValues(build.Version, runtime.Version(), build.User, build.Date.UTC().Format("2006-01-02T15:04:05Z")).Set(1)
if largeDB {
levelDBOptions.BlockCacheCapacity = 64 << 20
levelDBOptions.BlockSize = 64 << 10
levelDBOptions.CompactionTableSize = 16 << 20
levelDBOptions.CompactionTableSizeMultiplier = 2.0
levelDBOptions.WriteBuffer = 64 << 20
levelDBOptions.CompactionL0Trigger = 8
}
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if os.IsNotExist(err) {
log.Println("Failed to load keypair. Generating one, this might take a while...")
cert, err = tlsutil.NewCertificate(certFile, keyFile, "stdiscosrv", 20*365)
if err != nil {
log.Fatalln("Failed to generate X509 key pair:", err)
}
} else if err != nil {
log.Fatalln("Failed to load keypair:", err)
}
devID := protocol.NewDeviceID(cert.Certificate[0])
log.Println("Server device ID is", devID)
replCert := cert
if replCertFile != "" && replKeyFile != "" {
replCert, err = tls.LoadX509KeyPair(replCertFile, replKeyFile)
if err != nil {
log.Fatalln("Failed to load replication keypair:", err)
}
}
replDevID := protocol.NewDeviceID(replCert.Certificate[0])
log.Println("Replication device ID is", replDevID)
// Parse the replication specs, if any.
var allowedReplicationPeers []protocol.DeviceID
var replicationDestinations []string
parts := strings.Split(replicationPeers, ",")
for _, part := range parts {
if part == "" {
continue
}
fields := strings.Split(part, "@")
switch len(fields) {
case 2:
// This is an id@address specification. Grab the address for the
// destination list. Try to resolve it once to catch obvious
// syntax errors here rather than having the sender service fail
// repeatedly later.
_, err := net.ResolveTCPAddr("tcp", fields[1])
if err != nil {
log.Fatalln("Resolving address:", err)
}
replicationDestinations = append(replicationDestinations, fields[1])
fallthrough // N.B.
case 1:
// The first part is always a device ID.
id, err := protocol.DeviceIDFromString(fields[0])
if err != nil {
log.Fatalln("Parsing device ID:", err)
}
if id == protocol.EmptyDeviceID {
log.Fatalf("Missing device ID for peer in %q", part)
}
allowedReplicationPeers = append(allowedReplicationPeers, id)
default:
log.Fatalln("Unrecognized replication spec:", part)
}
}
// Root of the service tree.
main := suture.New("main", suture.Spec{
PassThroughPanics: true,
})
// Start the database.
db, err := newLevelDBStore(dir)
if err != nil {
log.Fatalln("Open database:", err)
}
main.Add(db)
// Start any replication senders.
var repl replicationMultiplexer
for _, dst := range replicationDestinations {
rs := newReplicationSender(dst, replCert, allowedReplicationPeers)
main.Add(rs)
repl = append(repl, rs)
}
// If we have replication configured, start the replication listener.
if len(allowedReplicationPeers) > 0 {
rl := newReplicationListener(replicationListen, replCert, allowedReplicationPeers, db)
main.Add(rl)
}
// Start the main API server.
qs := newAPISrv(listen, cert, db, repl, useHTTP)
main.Add(qs)
// If we have a metrics port configured, start a metrics handler.
if metricsListen != "" {
go func() {
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.Handler())
log.Fatal(http.ListenAndServe(metricsListen, mux))
}()
}
// Engage!
main.Serve(context.Background())
}
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