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bootstrapper.go
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bootstrapper.go
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package main
import (
"context"
"errors"
"fmt"
"io"
"net/url"
"os"
"os/signal"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
"cloud.google.com/go/storage"
pb "github.com/spacemeshos/api/release/go/spacemesh/v1"
"github.com/spf13/afero"
"github.com/spf13/cobra"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"github.com/spacemeshos/go-spacemesh/common/types"
"github.com/spacemeshos/go-spacemesh/log"
)
const (
retries = 3
retryInterval = 3 * time.Second
)
var (
bitcoinEndpoint string
spacemeshEndpoint string
genBeacon bool
genActiveSet bool
out string
creds string
serveUpdate bool
port int
epochOffset uint32
genFallback bool
dataDir string
logLevel string
)
func init() {
cmd.PersistentFlags().StringVar(&bitcoinEndpoint, "bitcoin-endpoint",
"https://api.blockcypher.com/v1/btc/main", "URL to get bitcoin block hash")
cmd.PersistentFlags().StringVar(&spacemeshEndpoint, "spacemesh-endpoint", "", "grpc endpoint for a spacemesh node")
// options specific to one-time execution
cmd.PersistentFlags().BoolVar(&genBeacon, "beacon", false, "generate beacon")
cmd.PersistentFlags().BoolVar(&genActiveSet, "actives", false, "generate active set")
cmd.PersistentFlags().StringVar(&out, "out", "gs://my-bucket", "gs URI for upload")
cmd.PersistentFlags().StringVar(&creds, "creds", "", "path to gcloud credential file")
// for systests only
cmd.PersistentFlags().BoolVar(&serveUpdate, "serve-update",
false, "if true, starts a http server to serve update too")
cmd.PersistentFlags().IntVar(&port, "port",
8080, "if starting a server, the port number to use")
cmd.PersistentFlags().Uint32Var(&epochOffset, "epoch-offset",
1, "number of layers before the next epoch start to publish update")
cmd.PersistentFlags().BoolVar(&genFallback, "fallback", false,
"in addition to bootstrap data, also generate fallback data")
// admin
cmd.PersistentFlags().StringVar(&dataDir, "data-dir", os.TempDir(), "directory to persist update data")
cmd.PersistentFlags().StringVar(&logLevel, "level", "info", "logging level")
}
var cmd = &cobra.Command{
Use: "bootstrapper",
Short: "generate bootstrapping data",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) == 0 {
return errors.New("epoch not specified")
}
var targetEpochs []types.EpochID
epochs := strings.Split(args[0], ",")
for _, e := range epochs {
epoch, err := strconv.Atoi(e)
if err != nil {
return fmt.Errorf("cannot convert %v to epoch: %w", e, err)
}
targetEpochs = append(targetEpochs, types.EpochID(epoch))
}
log.JSONLog(true)
lvl, err := zap.ParseAtomicLevel(strings.ToLower(logLevel))
if err != nil {
return err
}
logger := log.NewWithLevel("", lvl)
g := NewGenerator(
bitcoinEndpoint,
spacemeshEndpoint,
WithLogger(logger.WithName("generator")),
)
ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
defer cancel()
if serveUpdate {
srv := NewServer(g, genFallback, port,
WithSrvFilesystem(afero.NewOsFs()),
WithSrvLogger(logger.WithName("server")),
WithBootstrapEpochs(targetEpochs),
)
return runServer(ctx, srv)
}
if len(targetEpochs) != 1 {
return errors.New("too many epochs specified")
}
// one-time execution
if !genBeacon && !genActiveSet {
return errors.New("no action specified via --beacon or --actives")
}
if genBeacon && len(bitcoinEndpoint) == 0 {
return errors.New("missing bitcoin endpoint for beacon generation")
}
if genActiveSet && len(spacemeshEndpoint) == 0 {
return errors.New("missing spacemesh endpoint for active set generation")
}
gsBucket, gsPath, err := parseToGsBucket(out)
if err != nil {
return fmt.Errorf("parse output uri %v: %w", out, err)
}
persisted, err := g.Generate(ctx, targetEpochs[0], genBeacon, genActiveSet)
if err != nil {
return err
}
return upload(ctx, persisted, gsBucket, gsPath)
},
}
func upload(ctx context.Context, filename, gsBucket, gsPath string) error {
r, err := os.Open(filename)
if err != nil {
return fmt.Errorf("open generated file %v: %w", filename, err)
}
defer r.Close()
if err = os.Setenv("GOOGLE_APPLICATION_CREDENTIALS", creds); err != nil {
return fmt.Errorf("set env for credential: %w", err)
}
client, err := storage.NewClient(ctx)
if err != nil {
return fmt.Errorf("create gs client: %w", err)
}
objPath := fmt.Sprintf("%s/%s", gsPath, filepath.Base(filename))
w := client.Bucket(gsBucket).Object(objPath).NewWriter(ctx)
if _, err = io.Copy(w, r); err != nil {
return fmt.Errorf("copy to gs object (%v): %w", out, err)
}
if err = w.Close(); err != nil {
return fmt.Errorf("complete upload (%v): %w", out, err)
}
return nil
}
func parseToGsBucket(gsPath string) (bucket, path string, err error) {
parsed, err := url.Parse(gsPath)
if err != nil {
return "", "", err
}
if parsed.Scheme != "gs" {
return "", "", fmt.Errorf("path %s must have 'gs' scheme", gsPath)
}
if parsed.Host == "" {
return "", "", fmt.Errorf("path %s must have bucket", gsPath)
}
if parsed.Path == "" {
return parsed.Host, "", nil
}
// remove leading "/" in URL path
return parsed.Host, parsed.Path[1:], nil
}
func runServer(ctx context.Context, srv *Server) error {
var (
params *NetworkParam
err error
)
for i := 0; i < retries; i++ {
params, err = queryNetworkParams(ctx, spacemeshEndpoint)
if err != nil {
select {
case <-time.After(retryInterval):
continue
case <-ctx.Done():
return ctx.Err()
}
}
break
}
if err != nil {
return fmt.Errorf("query network params %v: %w", spacemeshEndpoint, err)
}
ch := make(chan error, 100)
srv.Start(ctx, ch, params)
select {
case err = <-ch:
case <-ctx.Done():
}
shutdownCxt, shutdownCancel := context.WithTimeout(context.Background(), 10*time.Second)
defer shutdownCancel()
srv.Stop(shutdownCxt)
return err
}
func queryNetworkParams(ctx context.Context, endpoint string) (*NetworkParam, error) {
conn, err := grpc.NewClient(
endpoint,
grpc.WithTransportCredentials(insecure.NewCredentials()),
)
if err != nil {
return nil, fmt.Errorf("dial grpc endpoint %v: %w", endpoint, err)
}
defer conn.Close()
svc := pb.NewMeshServiceClient(conn)
genResp, err := svc.GenesisTime(ctx, &pb.GenesisTimeRequest{})
if err != nil {
return nil, fmt.Errorf("query genesis time from %v: %w", endpoint, err)
}
lyrResp, err := svc.EpochNumLayers(ctx, &pb.EpochNumLayersRequest{})
if err != nil {
return nil, fmt.Errorf("query layers per epoch from %v: %w", endpoint, err)
}
durResp, err := svc.LayerDuration(ctx, &pb.LayerDurationRequest{})
if err != nil {
return nil, fmt.Errorf("query layers duration from %v: %w", endpoint, err)
}
return &NetworkParam{
Genesis: time.Unix(int64(genResp.Unixtime.Value), 0),
LyrsPerEpoch: lyrResp.Numlayers.Number,
LyrDuration: time.Second * time.Duration(durResp.Duration.Value),
Offset: epochOffset,
}, nil
}
func main() {
if err := cmd.Execute(); err != nil {
_, _ = fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}