/
rdvp.go
340 lines (313 loc) · 8.46 KB
/
rdvp.go
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package main
import (
"context"
"crypto/sha256"
"encoding/binary"
"fmt"
"io"
"math"
"math/rand"
"runtime"
"strconv"
"sync"
"time"
"github.com/denisbrodbeck/machineid"
p2p "github.com/libp2p/go-libp2p"
"github.com/libp2p/go-libp2p-core/discovery"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/libp2p/go-libp2p-core/peerstore"
"github.com/libp2p/go-libp2p/p2p/protocol/ping"
ma "github.com/multiformats/go-multiaddr"
"go.uber.org/zap"
"moul.io/srand"
"berty.tech/berty/v2/go/internal/ipfsutil"
"berty.tech/berty/v2/go/internal/tinder"
)
const timeRounding = time.Microsecond * 10
func testRDVPs(ctx context.Context, gwg *sync.WaitGroup, addrs []string) {
defer (*gwg).Done()
// Isolate each server
var pis []peer.AddrInfo
{
isolator := make(map[peer.ID][]ma.Multiaddr)
for _, addr := range addrs {
maddr, err := ma.NewMultiaddr(addr)
if err != nil {
newErrorS("Error parsing maddr: %q %s", addr, err)
continue
}
pi, err := peer.AddrInfoFromP2pAddr(maddr)
if err != nil {
newErrorS("Error creating PeerInfo: %q %s", maddr, err)
continue
}
isolator[pi.ID] = append(isolator[pi.ID], pi.Addrs...)
}
for id, addrs := range isolator {
if len(addrs) == 0 {
newErrorS("No address found for %s", id)
continue
}
pis = append(pis, peer.AddrInfo{ID: id, Addrs: addrs})
}
if len(pis) == 0 {
newError("No server found")
return
}
}
// Resolve each server
var errs []*discServerReturn
{
lenPis := len(pis)
errs = make([]*discServerReturn, lenPis)
var wg sync.WaitGroup
wg.Add(lenPis)
for lenPis > 0 {
lenPis--
// Start a goroutine per server.
go func(j int) {
defer wg.Done()
pi := pis[j]
idMaddr, err := ma.NewMultiaddr(fmt.Sprintf("/p2p/%s", pi.ID))
if err != nil {
newErrorS(`Can't parse "/p2p/%s" %s`, pi.ID, err)
return
}
lenAddrs := len(pi.Addrs)
lerrs := make([]*discReturn, lenAddrs)
defer func() {
rtr := discServerReturn{
id: pi.ID,
addrs: lerrs,
}
for _, v := range lerrs {
if v.success {
rtr.success = true
break
}
}
errs[j] = &rtr
}()
var lwg sync.WaitGroup
lwg.Add(lenAddrs)
for lenAddrs > 0 {
lenAddrs--
// Start a goroutine per addr
go func(j int) {
defer lwg.Done()
tgtMaddr := pi.Addrs[j]
rtr := discReturn{
target: tgtMaddr,
}
lerrs[j] = &rtr
tgtPi, err := ipfsutil.ParseAndResolveIpfsAddr(ctx, tgtMaddr.Encapsulate(idMaddr).String())
if err != nil {
rtr.message = fmt.Sprintf("Can't resolve addr %q", tgtMaddr)
return
}
// Setup host
host, err := p2p.New(
p2p.DisableRelay(),
p2p.ListenAddrStrings("/ip4/127.0.0.1/tcp/0"),
p2p.UserAgent("Berty Doctor"),
p2p.DefaultTransports,
)
if err != nil {
rtr.message = fmt.Sprintf("Error creating host: %s", err)
return
}
// Check if that particular addr is fine.
host.Peerstore().AddAddrs(tgtPi.ID, tgtPi.Addrs, peerstore.PermanentAddrTTL)
// Ping if we are in verbose
if verbose {
pingChan := ping.Ping(ctx, host, tgtPi.ID)
defer func() {
rtr.ping = <-pingChan
}()
}
// Setup discovery
disc := tinder.NewRendezvousDiscovery(
zap.NewNop(),
host,
tgtPi.ID,
rand.New(rand.NewSource(srand.SafeFast())), //nolint:gosec
)
// Generate a good key (mostly avoid collision with concurrent `make doctor` runs across the network).
var key string
{
// Using sha256 as this is not critical, probably still fast on most arch.
h := sha256.New()
buf := make([]byte, 8)
binary.LittleEndian.PutUint64(buf, uint64(srand.SafeFast()))
doWriteOnHash(h, buf)
id, err := machineid.ID()
if err == nil {
doWriteOnHash(h, []byte(id))
}
doWriteOnHash(h, []byte("Berty Doctor"))
buf = make([]byte, 8)
binary.LittleEndian.PutUint64(buf, uint64(runtime.NumCPU()))
doWriteOnHash(h, buf)
doWriteOnHash(h, []byte(runtime.Version()))
key = strconv.FormatUint(binary.LittleEndian.Uint64(h.Sum(nil)), 36)
}
// Advertise
{
start := time.Now()
duration, err := disc.Advertise(ctx, key, discovery.TTL(timeout))
if err != nil {
rtr.message = fmt.Sprintf("Error advertising on %q: %s", tgtMaddr, err)
return
}
// We want at least an Hour of time from the RDVP, else our timeout is fine.
if duration < timeout || duration >= time.Hour {
rtr.message = fmt.Sprintf("Wrong time (%d) while advertising on %q", duration, tgtMaddr)
_ = disc.Unregister(ctx, key)
return
}
rtr.t.advertise = time.Since(start)
}
// FindPeers
hid := host.ID()
{
start := time.Now()
// ReturnChannel
rc, err := disc.FindPeers(ctx, key)
if err != nil {
rtr.message = fmt.Sprintf("Error finding peers on %q: %s", tgtMaddr, err)
_ = disc.Unregister(ctx, key)
return
}
for v := range rc {
if hid == v.ID {
// Success !
rtr.t.fetch = time.Since(start)
goto TryingCheckUnregister
}
}
// Error we weren't able to find us
rtr.message = fmt.Sprintf("Wasn't able to find us on maddr %q", tgtMaddr)
_ = disc.Unregister(ctx, key)
return
}
TryingCheckUnregister:
// Unregister
{
start := time.Now()
err = disc.Unregister(ctx, key)
if err != nil {
rtr.message = fmt.Sprintf("Error unregistering us on %q: %s", tgtMaddr, err)
return
}
rtr.t.unregister = time.Since(start)
}
// FindPeers again but this time we shouldn't be there.
{
start := time.Now()
// ReturnChannel
rc, err := disc.FindPeers(ctx, key)
if err != nil {
rtr.message = fmt.Sprintf("Error finding peers after unregister on %q: %s", tgtMaddr, err)
return
}
for v := range rc {
if hid == v.ID {
rtr.message = fmt.Sprintf("Finding us after unregister on %q", tgtMaddr)
return
}
}
rtr.t.fetchUnregistered = time.Since(start)
}
rtr.success = true
}(lenAddrs)
}
// Waiting for defers.
lwg.Wait()
}(lenPis)
}
wg.Wait()
}
// Checking for results
{
// Does at least one were successful ?
var successCount uint
advertiseFetchRTTMinimal := time.Duration(math.MaxInt64)
for _, v := range errs {
if v.success {
successCount++
for _, w := range v.addrs {
if w.success {
wrtt := w.t.advertise + w.t.fetch
if wrtt < advertiseFetchRTTMinimal {
advertiseFetchRTTMinimal = wrtt
}
}
}
}
}
if verbose || successCount == 0 {
talkLock.Lock()
for _, server := range errs {
if server.success {
fmt.Printf("[+] %s ", green("OK"))
} else {
if successCount == 0 {
fmt.Printf("[-] %s ", red("ERROR"))
errc++
} else {
fmt.Printf("[-] %s ", yellow("WARN"))
warnc++
}
}
fmt.Printf("RDVP %s:\n", server.id)
for _, addr := range server.addrs {
if addr.success {
fmt.Printf(" [%s] %q (A: %s, F: %s, U: %s, FU: %s",
green("+"),
addr.target,
addr.t.advertise.Round(timeRounding).String(),
addr.t.fetch.Round(timeRounding).String(),
addr.t.unregister.Round(timeRounding).String(),
addr.t.fetchUnregistered.Round(timeRounding).String(),
)
if addr.ping.Error == nil {
fmt.Printf(", P: %s", addr.ping.RTT.Round(timeRounding).String())
}
fmt.Print(")\n")
} else {
fmt.Printf(" [%s] %q: %s\n", red("-"), addr.target, addr.message)
}
}
}
talkLock.Unlock()
} else {
newOkS("RDVP (%d/%d, min A+F: %s)", successCount, len(errs), advertiseFetchRTTMinimal.Round(timeRounding).String())
}
}
}
type discServerReturn struct {
success bool
id peer.ID
addrs []*discReturn
}
type discReturn struct {
success bool
target ma.Multiaddr
message string
ping ping.Result
t struct {
advertise time.Duration
fetch time.Duration
unregister time.Duration
fetchUnregistered time.Duration
}
}
func doWriteOnHash(h io.Writer, buf []byte) {
toWrite := len(buf)
written := 0
for written < toWrite {
// hash.Hash never returns an error.
n, _ := h.Write(buf[written:])
written += n
}
}