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main.go
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package main
import (
"archive/tar"
"bufio"
"compress/gzip"
"context"
"encoding/json"
"fmt"
"io"
"log"
"log/slog"
"net/http"
"os"
"os/signal"
"path/filepath"
"strings"
"sync"
"syscall"
"time"
"github.com/bluesky-social/indigo/atproto/data"
"github.com/bluesky-social/indigo/repo"
"github.com/ipfs/go-cid"
_ "github.com/joho/godotenv/autoload"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
"golang.org/x/time/rate"
"github.com/carlmjohnson/versioninfo"
"github.com/urfave/cli/v2"
)
func main() {
app := cli.App{
Name: "netsync",
Usage: "atproto network cloning tool",
Version: versioninfo.Short(),
}
app.Flags = []cli.Flag{
&cli.IntFlag{
Name: "port",
Usage: "listen port for metrics server",
Value: 8753,
},
&cli.IntFlag{
Name: "worker-count",
Usage: "number of workers to run concurrently",
Value: 10,
},
&cli.Float64Flag{
Name: "checkout-limit",
Usage: "maximum number of repos per second to checkout",
Value: 4,
},
&cli.StringFlag{
Name: "out-dir",
Usage: "directory to write cloned repos to",
Value: "netsync-out",
},
&cli.StringFlag{
Name: "repo-list",
Usage: "path to file containing list of repos to clone",
Value: "repos.txt",
},
&cli.StringFlag{
Name: "state-file",
Usage: "path to file to write state to",
Value: "state.json",
},
&cli.StringFlag{
Name: "checkout-path",
Usage: "path to checkout endpoint",
Value: "https://bsky.network/xrpc/com.atproto.sync.getRepo",
},
&cli.StringFlag{
Name: "magic-header-key",
Usage: "header key to send with checkout request",
Value: "",
EnvVars: []string{"MAGIC_HEADER_KEY"},
},
&cli.StringFlag{
Name: "magic-header-val",
Usage: "header value to send with checkout request",
Value: "",
EnvVars: []string{"MAGIC_HEADER_VAL"},
},
}
app.Commands = []*cli.Command{
{
Name: "retry",
Usage: "requeue failed repos",
Action: func(cctx *cli.Context) error {
state := &NetsyncState{
StatePath: cctx.String("state-file"),
}
err := state.Resume()
if err != nil {
return err
}
// Look through finished repos for failed ones
for _, repoState := range state.FinishedRepos {
// Don't retry repos that failed due to a 400 (they've been deleted)
if strings.HasPrefix(repoState.State, "failed") && repoState.State != "failed (status: 400)" {
state.EnqueuedRepos[repoState.Repo] = &RepoState{
Repo: repoState.Repo,
State: "enqueued",
}
}
}
// Save state
return state.Save()
},
},
}
app.Action = Netsync
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
type RepoState struct {
Repo string
State string
FinishedAt time.Time
}
type NetsyncState struct {
EnqueuedRepos map[string]*RepoState
FinishedRepos map[string]*RepoState
StatePath string
CheckoutPath string
outDir string
magicHeaderKey string
magicHeaderVal string
logger *slog.Logger
lk sync.RWMutex
wg sync.WaitGroup
exit chan struct{}
limiter *rate.Limiter
workerCount int
client *http.Client
}
type instrumentedReader struct {
source io.ReadCloser
counter prometheus.Counter
}
func (r instrumentedReader) Read(b []byte) (int, error) {
n, err := r.source.Read(b)
r.counter.Add(float64(n))
return n, err
}
func (r instrumentedReader) Close() error {
var buf [32]byte
var n int
var err error
for err == nil {
n, err = r.source.Read(buf[:])
r.counter.Add(float64(n))
}
closeerr := r.source.Close()
if err != nil && err != io.EOF {
return err
}
return closeerr
}
func (s *NetsyncState) Save() error {
s.lk.RLock()
defer s.lk.RUnlock()
stateFile, err := os.OpenFile(s.StatePath, os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return err
}
defer stateFile.Close()
stateBytes, err := json.Marshal(s)
if err != nil {
return err
}
_, err = stateFile.Write(stateBytes)
return err
}
func (s *NetsyncState) Resume() error {
stateFile, err := os.Open(s.StatePath)
if err != nil {
return err
}
stateBytes, err := io.ReadAll(stateFile)
if err != nil {
return err
}
err = json.Unmarshal(stateBytes, s)
if err != nil {
return err
}
return nil
}
var enqueuedJobs = promauto.NewGauge(prometheus.GaugeOpts{
Name: "netsync_enqueued_jobs",
Help: "Number of enqueued jobs",
})
func (s *NetsyncState) Dequeue() string {
s.lk.Lock()
defer s.lk.Unlock()
enqueuedJobs.Set(float64(len(s.EnqueuedRepos)))
for repo, state := range s.EnqueuedRepos {
if state.State == "enqueued" {
state.State = "dequeued"
return repo
}
}
return ""
}
var finishedJobs = promauto.NewGauge(prometheus.GaugeOpts{
Name: "netsync_finished_jobs",
Help: "Number of finished jobs",
})
func (s *NetsyncState) Finish(repo string, state string) {
s.lk.Lock()
defer s.lk.Unlock()
s.FinishedRepos[repo] = &RepoState{
Repo: repo,
State: state,
FinishedAt: time.Now(),
}
finishedJobs.Set(float64(len(s.FinishedRepos)))
delete(s.EnqueuedRepos, repo)
}
func Netsync(cctx *cli.Context) error {
ctx := cctx.Context
ctx, cancel := context.WithCancel(ctx)
defer cancel()
logLevel := slog.LevelInfo
logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: logLevel, AddSource: true}))
slog.SetDefault(slog.New(logger.Handler()))
state := &NetsyncState{
StatePath: cctx.String("state-file"),
CheckoutPath: cctx.String("checkout-path"),
outDir: cctx.String("out-dir"),
workerCount: cctx.Int("worker-count"),
limiter: rate.NewLimiter(rate.Limit(cctx.Float64("checkout-limit")), 1),
magicHeaderKey: cctx.String("magic-header-key"),
magicHeaderVal: cctx.String("magic-header-val"),
exit: make(chan struct{}),
wg: sync.WaitGroup{},
client: &http.Client{
Timeout: 180 * time.Second,
},
logger: logger,
}
if state.magicHeaderKey != "" && state.magicHeaderVal != "" {
logger.Info("using magic header")
}
// Create out dir
err := os.MkdirAll(state.outDir, 0755)
if err != nil {
return err
}
// Try to resume from state file
err = state.Resume()
if state.EnqueuedRepos == nil {
state.EnqueuedRepos = make(map[string]*RepoState)
} else {
// Reset any dequeued repos
for _, repoState := range state.EnqueuedRepos {
if repoState.State == "dequeued" {
repoState.State = "enqueued"
}
}
}
if state.FinishedRepos == nil {
state.FinishedRepos = make(map[string]*RepoState)
}
if err != nil {
// Read repo list
repoListFile, err := os.Open(cctx.String("repo-list"))
if err != nil {
return err
}
fileScanner := bufio.NewScanner(repoListFile)
fileScanner.Split(bufio.ScanLines)
for fileScanner.Scan() {
repo := fileScanner.Text()
state.EnqueuedRepos[repo] = &RepoState{
Repo: repo,
State: "enqueued",
}
}
} else {
logger.Info("Resuming from state file")
}
// Start metrics server
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.Handler())
metricsServer := &http.Server{
Addr: fmt.Sprintf(":%d", cctx.Int("port")),
Handler: mux,
}
go func() {
state.wg.Add(1)
defer state.wg.Done()
if err := metricsServer.ListenAndServe(); err != http.ErrServerClosed {
logger.Error("failed to start metrics server", "err", err)
os.Exit(1)
}
logger.Info("metrics server shut down successfully")
}()
// Start workers
for i := 0; i < state.workerCount; i++ {
state.wg.Add(1)
go func(id int) {
defer state.wg.Done()
err := state.worker(id)
if err != nil {
logger.Error("worker failed", "err", err)
}
}(i)
}
// Check for empty queue
go func() {
state.wg.Add(1)
defer state.wg.Done()
t := time.NewTicker(30 * time.Second)
for {
select {
case <-ctx.Done():
err := state.Save()
if err != nil {
logger.Error("failed to save state", "err", err)
}
return
case <-t.C:
err := state.Save()
if err != nil {
logger.Error("failed to save state", "err", err)
}
state.lk.RLock()
if len(state.EnqueuedRepos) == 0 {
logger.Info("no more repos to clone, shutting down")
close(state.exit)
return
}
state.lk.RUnlock()
}
}
}()
// Trap SIGINT to trigger a shutdown.
logger.Info("listening for signals")
signals := make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
select {
case sig := <-signals:
cancel()
close(state.exit)
logger.Info("shutting down on signal", "signal", sig)
case <-ctx.Done():
cancel()
close(state.exit)
logger.Info("shutting down on context done")
case <-state.exit:
cancel()
logger.Info("shutting down on exit signal")
}
logger.Info("shutting down, waiting for workers to clean up...")
if err := metricsServer.Shutdown(ctx); err != nil {
logger.Error("failed to shut down metrics server", "err", err)
}
state.wg.Wait()
logger.Info("shut down successfully")
return nil
}
func (s *NetsyncState) worker(id int) error {
log := s.logger.With("worker", id)
log.Info("starting worker")
defer log.Info("worker stopped")
for {
select {
case <-s.exit:
log.Info("worker exiting due to exit signal")
return nil
default:
ctx := context.Background()
// Dequeue repo
repo := s.Dequeue()
if repo == "" {
// No more repos to clone
return nil
}
// Wait for rate limiter
s.limiter.Wait(ctx)
// Clone repo
cloneState, err := s.cloneRepo(ctx, repo)
if err != nil {
log.Error("failed to clone repo", "repo", repo, "err", err)
}
// Update state
s.Finish(repo, cloneState)
log.Info("worker finished", "repo", repo, "status", cloneState)
}
}
}
var repoCloneDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
Name: "netsync_repo_clone_duration_seconds",
Help: "Duration of repo clone operations",
}, []string{"status"})
var bytesProcessed = promauto.NewCounter(prometheus.CounterOpts{
Name: "netsync_bytes_processed",
Help: "Number of bytes processed",
})
func (s *NetsyncState) cloneRepo(ctx context.Context, did string) (cloneState string, err error) {
log := s.logger.With("repo", did, "source", "cloneRepo")
log.Info("cloning repo")
start := time.Now()
defer func() {
duration := time.Since(start)
repoCloneDuration.WithLabelValues(cloneState).Observe(duration.Seconds())
}()
var url = fmt.Sprintf("%s?did=%s", s.CheckoutPath, did)
// Clone repo
req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
if err != nil {
cloneState = "failed (request-creation)"
return cloneState, fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Accept", "application/vnd.ipld.car")
req.Header.Set("User-Agent", "jaz-atproto-netsync/0.0.1")
if s.magicHeaderKey != "" && s.magicHeaderVal != "" {
req.Header.Set(s.magicHeaderKey, s.magicHeaderVal)
}
resp, err := s.client.Do(req)
if err != nil {
cloneState = "failed (client.do)"
return cloneState, fmt.Errorf("failed to get repo: %w", err)
}
if resp.StatusCode != http.StatusOK {
cloneState = fmt.Sprintf("failed (status: %d)", resp.StatusCode)
return cloneState, fmt.Errorf("failed to get repo: %s", resp.Status)
}
instrumentedReader := instrumentedReader{
source: resp.Body,
counter: bytesProcessed,
}
defer instrumentedReader.Close()
// Write to file
outPath, err := filepath.Abs(fmt.Sprintf("%s/%s.tar.gz", s.outDir, did))
if err != nil {
cloneState = "failed (file.abs)"
return cloneState, fmt.Errorf("failed to get absolute path: %w", err)
}
tarFile, err := os.OpenFile(outPath, os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
cloneState = "failed (file.open)"
return cloneState, fmt.Errorf("failed to open file: %w", err)
}
defer tarFile.Close()
gzipWriter := gzip.NewWriter(tarFile)
defer gzipWriter.Close()
tarWriter := tar.NewWriter(gzipWriter)
defer tarWriter.Close()
numRecords := 0
collectionsSeen := make(map[string]struct{})
r, err := repo.ReadRepoFromCar(ctx, instrumentedReader)
if err != nil {
log.Error("Error reading repo", "err", err)
return "failed (read-repo)", fmt.Errorf("Failed to read repo from CAR: %w", err)
}
err = r.ForEach(ctx, "", func(path string, nodeCid cid.Cid) error {
log := log.With("path", path, "nodeCid", nodeCid)
recordCid, rec, err := r.GetRecordBytes(ctx, path)
if err != nil {
log.Error("Error getting record", "err", err)
return nil
}
// Verify that the record CID matches the node CID
if recordCid != nodeCid {
log.Error("Mismatch in record and node CID", "recordCID", recordCid, "nodeCID", nodeCid)
return nil
}
parts := strings.Split(path, "/")
if len(parts) != 2 {
log.Error("Path does not have 2 parts", "path", path)
return nil
}
collection := parts[0]
rkey := parts[1]
numRecords++
if _, ok := collectionsSeen[collection]; !ok {
collectionsSeen[collection] = struct{}{}
}
asCbor, err := data.UnmarshalCBOR(*rec)
if err != nil {
log.Error("Error unmarshalling record", "err", err)
return fmt.Errorf("Failed to unmarshal record: %w", err)
}
recJSON, err := json.Marshal(asCbor)
if err != nil {
log.Error("Error marshalling record to JSON", "err", err)
return fmt.Errorf("Failed to marshal record to JSON: %w", err)
}
// Write the record directly to the tar.gz file
hdr := &tar.Header{
Name: fmt.Sprintf("%s/%s.json", collection, rkey),
Mode: 0600,
Size: int64(len(recJSON)),
}
if err := tarWriter.WriteHeader(hdr); err != nil {
log.Error("Error writing tar header", "err", err)
return err
}
if _, err := tarWriter.Write(recJSON); err != nil {
log.Error("Error writing record to tar file", "err", err)
return err
}
return nil
})
if err != nil {
log.Error("Error during ForEach", "err", err)
return "failed (for-each)", fmt.Errorf("Error during ForEach: %w", err)
}
log.Info("checkout complete", "numRecords", numRecords, "numCollections", len(collectionsSeen))
cloneState = "success"
return cloneState, nil
}