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fedmgr.go
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fedmgr.go
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package bgs
import (
"context"
"errors"
"fmt"
"math/rand"
"strings"
"sync"
"time"
"github.com/RussellLuo/slidingwindow"
comatproto "github.com/bluesky-social/indigo/api/atproto"
"github.com/bluesky-social/indigo/events"
"github.com/bluesky-social/indigo/events/schedulers/parallel"
"github.com/bluesky-social/indigo/models"
"go.opentelemetry.io/otel"
"golang.org/x/time/rate"
"github.com/gorilla/websocket"
pq "github.com/lib/pq"
"gorm.io/gorm"
)
type IndexCallback func(context.Context, *models.PDS, *events.XRPCStreamEvent) error
// TODO: rename me
type Slurper struct {
cb IndexCallback
db *gorm.DB
lk sync.Mutex
active map[string]*activeSub
LimitMux sync.RWMutex
Limiters map[uint]*Limiters
DefaultPerSecondLimit int64
DefaultPerHourLimit int64
DefaultPerDayLimit int64
DefaultCrawlLimit rate.Limit
DefaultRepoLimit int64
NewPDSPerDayLimiter *slidingwindow.Limiter
newSubsDisabled bool
trustedDomains []string
shutdownChan chan bool
shutdownResult chan []error
ssl bool
}
type Limiters struct {
PerSecond *slidingwindow.Limiter
PerHour *slidingwindow.Limiter
PerDay *slidingwindow.Limiter
}
type SlurperOptions struct {
SSL bool
DefaultPerSecondLimit int64
DefaultPerHourLimit int64
DefaultPerDayLimit int64
DefaultCrawlLimit rate.Limit
DefaultRepoLimit int64
}
func DefaultSlurperOptions() *SlurperOptions {
return &SlurperOptions{
SSL: false,
DefaultPerSecondLimit: 50,
DefaultPerHourLimit: 1500,
DefaultPerDayLimit: 10_000,
DefaultCrawlLimit: rate.Limit(5),
DefaultRepoLimit: 10,
}
}
type activeSub struct {
pds *models.PDS
lk sync.RWMutex
ctx context.Context
cancel func()
}
func NewSlurper(db *gorm.DB, cb IndexCallback, opts *SlurperOptions) (*Slurper, error) {
if opts == nil {
opts = DefaultSlurperOptions()
}
db.AutoMigrate(&SlurpConfig{})
s := &Slurper{
cb: cb,
db: db,
active: make(map[string]*activeSub),
Limiters: make(map[uint]*Limiters),
DefaultPerSecondLimit: opts.DefaultPerSecondLimit,
DefaultPerHourLimit: opts.DefaultPerHourLimit,
DefaultPerDayLimit: opts.DefaultPerDayLimit,
DefaultCrawlLimit: opts.DefaultCrawlLimit,
DefaultRepoLimit: opts.DefaultRepoLimit,
ssl: opts.SSL,
shutdownChan: make(chan bool),
shutdownResult: make(chan []error),
}
if err := s.loadConfig(); err != nil {
return nil, err
}
// Start a goroutine to flush cursors to the DB every 30s
go func() {
for {
select {
case <-s.shutdownChan:
log.Info("flushing PDS cursors on shutdown")
ctx := context.Background()
ctx, span := otel.Tracer("feedmgr").Start(ctx, "CursorFlusherShutdown")
defer span.End()
var errs []error
if errs = s.flushCursors(ctx); len(errs) > 0 {
for _, err := range errs {
log.Errorf("failed to flush cursors on shutdown: %s", err)
}
}
log.Info("done flushing PDS cursors on shutdown")
s.shutdownResult <- errs
return
case <-time.After(time.Second * 10):
log.Debug("flushing PDS cursors")
ctx := context.Background()
ctx, span := otel.Tracer("feedmgr").Start(ctx, "CursorFlusher")
defer span.End()
if errs := s.flushCursors(ctx); len(errs) > 0 {
for _, err := range errs {
log.Errorf("failed to flush cursors: %s", err)
}
}
log.Debug("done flushing PDS cursors")
}
}
}()
return s, nil
}
func windowFunc() (slidingwindow.Window, slidingwindow.StopFunc) {
return slidingwindow.NewLocalWindow()
}
func (s *Slurper) GetLimiters(pdsID uint) *Limiters {
s.LimitMux.RLock()
defer s.LimitMux.RUnlock()
return s.Limiters[pdsID]
}
func (s *Slurper) GetOrCreateLimiters(pdsID uint, perSecLimit int64, perHourLimit int64, perDayLimit int64) *Limiters {
s.LimitMux.RLock()
defer s.LimitMux.RUnlock()
lim, ok := s.Limiters[pdsID]
if !ok {
perSec, _ := slidingwindow.NewLimiter(time.Second, perSecLimit, windowFunc)
perHour, _ := slidingwindow.NewLimiter(time.Hour, perHourLimit, windowFunc)
perDay, _ := slidingwindow.NewLimiter(time.Hour*24, perDayLimit, windowFunc)
lim = &Limiters{
PerSecond: perSec,
PerHour: perHour,
PerDay: perDay,
}
s.Limiters[pdsID] = lim
}
return lim
}
func (s *Slurper) SetLimits(pdsID uint, perSecLimit int64, perHourLimit int64, perDayLimit int64) {
s.LimitMux.Lock()
defer s.LimitMux.Unlock()
lim, ok := s.Limiters[pdsID]
if !ok {
perSec, _ := slidingwindow.NewLimiter(time.Second, perSecLimit, windowFunc)
perHour, _ := slidingwindow.NewLimiter(time.Hour, perHourLimit, windowFunc)
perDay, _ := slidingwindow.NewLimiter(time.Hour*24, perDayLimit, windowFunc)
lim = &Limiters{
PerSecond: perSec,
PerHour: perHour,
PerDay: perDay,
}
s.Limiters[pdsID] = lim
}
lim.PerSecond.SetLimit(perSecLimit)
lim.PerHour.SetLimit(perHourLimit)
lim.PerDay.SetLimit(perDayLimit)
}
// Shutdown shuts down the slurper
func (s *Slurper) Shutdown() []error {
s.shutdownChan <- true
log.Info("waiting for slurper shutdown")
errs := <-s.shutdownResult
if len(errs) > 0 {
for _, err := range errs {
log.Errorf("shutdown error: %s", err)
}
}
log.Info("slurper shutdown complete")
return errs
}
func (s *Slurper) loadConfig() error {
var sc SlurpConfig
if err := s.db.Find(&sc).Error; err != nil {
return err
}
if sc.ID == 0 {
if err := s.db.Create(&SlurpConfig{}).Error; err != nil {
return err
}
}
s.newSubsDisabled = sc.NewSubsDisabled
s.trustedDomains = sc.TrustedDomains
s.NewPDSPerDayLimiter, _ = slidingwindow.NewLimiter(time.Hour*24, sc.NewPDSPerDayLimit, windowFunc)
return nil
}
type SlurpConfig struct {
gorm.Model
NewSubsDisabled bool
TrustedDomains pq.StringArray `gorm:"type:text[]"`
NewPDSPerDayLimit int64
}
func (s *Slurper) SetNewSubsDisabled(dis bool) error {
s.lk.Lock()
defer s.lk.Unlock()
if err := s.db.Model(SlurpConfig{}).Where("id = 1").Update("new_subs_disabled", dis).Error; err != nil {
return err
}
s.newSubsDisabled = dis
return nil
}
func (s *Slurper) GetNewSubsDisabledState() bool {
s.lk.Lock()
defer s.lk.Unlock()
return s.newSubsDisabled
}
func (s *Slurper) SetNewPDSPerDayLimit(limit int64) error {
s.lk.Lock()
defer s.lk.Unlock()
if err := s.db.Model(SlurpConfig{}).Where("id = 1").Update("new_pds_per_day_limit", limit).Error; err != nil {
return err
}
s.NewPDSPerDayLimiter.SetLimit(limit)
return nil
}
func (s *Slurper) GetNewPDSPerDayLimit() int64 {
s.lk.Lock()
defer s.lk.Unlock()
return s.NewPDSPerDayLimiter.Limit()
}
func (s *Slurper) AddTrustedDomain(domain string) error {
s.lk.Lock()
defer s.lk.Unlock()
if err := s.db.Model(SlurpConfig{}).Where("id = 1").Update("trusted_domains", gorm.Expr("array_append(trusted_domains, ?)", domain)).Error; err != nil {
return err
}
s.trustedDomains = append(s.trustedDomains, domain)
return nil
}
func (s *Slurper) RemoveTrustedDomain(domain string) error {
s.lk.Lock()
defer s.lk.Unlock()
if err := s.db.Model(SlurpConfig{}).Where("id = 1").Update("trusted_domains", gorm.Expr("array_remove(trusted_domains, ?)", domain)).Error; err != nil {
if errors.Is(err, gorm.ErrRecordNotFound) {
return nil
}
return err
}
for i, d := range s.trustedDomains {
if d == domain {
s.trustedDomains = append(s.trustedDomains[:i], s.trustedDomains[i+1:]...)
break
}
}
return nil
}
func (s *Slurper) SetTrustedDomains(domains []string) error {
s.lk.Lock()
defer s.lk.Unlock()
if err := s.db.Model(SlurpConfig{}).Where("id = 1").Update("trusted_domains", domains).Error; err != nil {
return err
}
s.trustedDomains = domains
return nil
}
func (s *Slurper) GetTrustedDomains() []string {
s.lk.Lock()
defer s.lk.Unlock()
return s.trustedDomains
}
var ErrNewSubsDisabled = fmt.Errorf("new subscriptions temporarily disabled")
// Checks whether a host is allowed to be subscribed to
// must be called with the slurper lock held
func (s *Slurper) canSlurpHost(host string) bool {
// Check if we're over the limit for new PDSs today
if !s.NewPDSPerDayLimiter.Allow() {
return false
}
// Check if the host is a trusted domain
for _, d := range s.trustedDomains {
// If the domain starts with a *., it's a wildcard
if strings.HasPrefix(d, "*.") {
// Cut off the * so we have .domain.com
if strings.HasSuffix(host, strings.TrimPrefix(d, "*")) {
return true
}
} else {
if host == d {
return true
}
}
}
return !s.newSubsDisabled
}
func (s *Slurper) SubscribeToPds(ctx context.Context, host string, reg bool, adminOverride bool) error {
// TODO: for performance, lock on the hostname instead of global
s.lk.Lock()
defer s.lk.Unlock()
_, ok := s.active[host]
if ok {
return nil
}
var peering models.PDS
if err := s.db.Find(&peering, "host = ?", host).Error; err != nil {
return err
}
if peering.Blocked {
return fmt.Errorf("cannot subscribe to blocked pds")
}
if peering.ID == 0 {
if !adminOverride && !s.canSlurpHost(host) {
return ErrNewSubsDisabled
}
// New PDS!
npds := models.PDS{
Host: host,
SSL: s.ssl,
Registered: reg,
RateLimit: float64(s.DefaultPerSecondLimit),
HourlyEventLimit: s.DefaultPerHourLimit,
DailyEventLimit: s.DefaultPerDayLimit,
CrawlRateLimit: float64(s.DefaultCrawlLimit),
RepoLimit: s.DefaultRepoLimit,
}
if err := s.db.Create(&npds).Error; err != nil {
return err
}
peering = npds
}
if !peering.Registered && reg {
peering.Registered = true
if err := s.db.Model(models.PDS{}).Where("id = ?", peering.ID).Update("registered", true).Error; err != nil {
return err
}
}
ctx, cancel := context.WithCancel(context.Background())
sub := activeSub{
pds: &peering,
ctx: ctx,
cancel: cancel,
}
s.active[host] = &sub
s.GetOrCreateLimiters(peering.ID, int64(peering.RateLimit), peering.HourlyEventLimit, peering.DailyEventLimit)
go s.subscribeWithRedialer(ctx, &peering, &sub)
return nil
}
func (s *Slurper) RestartAll() error {
s.lk.Lock()
defer s.lk.Unlock()
var all []models.PDS
if err := s.db.Find(&all, "registered = true AND blocked = false").Error; err != nil {
return err
}
for _, pds := range all {
pds := pds
ctx, cancel := context.WithCancel(context.Background())
sub := activeSub{
pds: &pds,
ctx: ctx,
cancel: cancel,
}
s.active[pds.Host] = &sub
// Check if we've already got a limiter for this PDS
s.GetOrCreateLimiters(pds.ID, int64(pds.RateLimit), pds.HourlyEventLimit, pds.DailyEventLimit)
go s.subscribeWithRedialer(ctx, &pds, &sub)
}
return nil
}
func (s *Slurper) subscribeWithRedialer(ctx context.Context, host *models.PDS, sub *activeSub) {
defer func() {
s.lk.Lock()
defer s.lk.Unlock()
delete(s.active, host.Host)
}()
d := websocket.Dialer{
HandshakeTimeout: time.Second * 5,
}
protocol := "ws"
if s.ssl {
protocol = "wss"
}
cursor := host.Cursor
var backoff int
for {
select {
case <-ctx.Done():
return
default:
}
url := fmt.Sprintf("%s://%s/xrpc/com.atproto.sync.subscribeRepos?cursor=%d", protocol, host.Host, cursor)
con, res, err := d.DialContext(ctx, url, nil)
if err != nil {
log.Warnw("dialing failed", "host", host.Host, "err", err, "backoff", backoff)
time.Sleep(sleepForBackoff(backoff))
backoff++
if backoff > 15 {
log.Warnw("pds does not appear to be online, disabling for now", "host", host.Host)
if err := s.db.Model(&models.PDS{}).Where("id = ?", host.ID).Update("registered", false).Error; err != nil {
log.Errorf("failed to unregister failing pds: %w", err)
}
return
}
continue
}
log.Info("event subscription response code: ", res.StatusCode)
curCursor := cursor
if err := s.handleConnection(ctx, host, con, &cursor, sub); err != nil {
if errors.Is(err, ErrTimeoutShutdown) {
log.Infof("shutting down pds subscription to %s, no activity after %s", host.Host, EventsTimeout)
return
}
log.Warnf("connection to %q failed: %s", host.Host, err)
}
if cursor > curCursor {
backoff = 0
}
}
}
func sleepForBackoff(b int) time.Duration {
if b == 0 {
return 0
}
if b < 10 {
return (time.Duration(b) * 2) + (time.Millisecond * time.Duration(rand.Intn(1000)))
}
return time.Second * 30
}
var ErrTimeoutShutdown = fmt.Errorf("timed out waiting for new events")
var EventsTimeout = time.Minute
func (s *Slurper) handleConnection(ctx context.Context, host *models.PDS, con *websocket.Conn, lastCursor *int64, sub *activeSub) error {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
rsc := &events.RepoStreamCallbacks{
RepoCommit: func(evt *comatproto.SyncSubscribeRepos_Commit) error {
log.Debugw("got remote repo event", "host", host.Host, "repo", evt.Repo, "seq", evt.Seq)
if err := s.cb(context.TODO(), host, &events.XRPCStreamEvent{
RepoCommit: evt,
}); err != nil {
log.Errorf("failed handling event from %q (%d): %s", host.Host, evt.Seq, err)
}
*lastCursor = evt.Seq
if err := s.updateCursor(sub, *lastCursor); err != nil {
return fmt.Errorf("updating cursor: %w", err)
}
return nil
},
RepoHandle: func(evt *comatproto.SyncSubscribeRepos_Handle) error {
log.Infow("got remote handle update event", "host", host.Host, "did", evt.Did, "handle", evt.Handle)
if err := s.cb(context.TODO(), host, &events.XRPCStreamEvent{
RepoHandle: evt,
}); err != nil {
log.Errorf("failed handling event from %q (%d): %s", host.Host, evt.Seq, err)
}
*lastCursor = evt.Seq
if err := s.updateCursor(sub, *lastCursor); err != nil {
return fmt.Errorf("updating cursor: %w", err)
}
return nil
},
RepoMigrate: func(evt *comatproto.SyncSubscribeRepos_Migrate) error {
log.Infow("got remote repo migrate event", "host", host.Host, "did", evt.Did, "migrateTo", evt.MigrateTo)
if err := s.cb(context.TODO(), host, &events.XRPCStreamEvent{
RepoMigrate: evt,
}); err != nil {
log.Errorf("failed handling event from %q (%d): %s", host.Host, evt.Seq, err)
}
*lastCursor = evt.Seq
if err := s.updateCursor(sub, *lastCursor); err != nil {
return fmt.Errorf("updating cursor: %w", err)
}
return nil
},
RepoTombstone: func(evt *comatproto.SyncSubscribeRepos_Tombstone) error {
log.Infow("got remote repo tombstone event", "host", host.Host, "did", evt.Did)
if err := s.cb(context.TODO(), host, &events.XRPCStreamEvent{
RepoTombstone: evt,
}); err != nil {
log.Errorf("failed handling event from %q (%d): %s", host.Host, evt.Seq, err)
}
*lastCursor = evt.Seq
if err := s.updateCursor(sub, *lastCursor); err != nil {
return fmt.Errorf("updating cursor: %w", err)
}
return nil
},
RepoInfo: func(info *comatproto.SyncSubscribeRepos_Info) error {
log.Infow("info event", "name", info.Name, "message", info.Message, "host", host.Host)
return nil
},
RepoIdentity: func(ident *comatproto.SyncSubscribeRepos_Identity) error {
log.Infow("identity event", "did", ident.Did)
if err := s.cb(context.TODO(), host, &events.XRPCStreamEvent{
RepoIdentity: ident,
}); err != nil {
log.Errorf("failed handling event from %q (%d): %s", host.Host, ident.Seq, err)
}
*lastCursor = ident.Seq
if err := s.updateCursor(sub, *lastCursor); err != nil {
return fmt.Errorf("updating cursor: %w", err)
}
return nil
},
// TODO: all the other event types (handle change, migration, etc)
Error: func(errf *events.ErrorFrame) error {
switch errf.Error {
case "FutureCursor":
// if we get a FutureCursor frame, reset our sequence number for this host
if err := s.db.Table("pds").Where("id = ?", host.ID).Update("cursor", 0).Error; err != nil {
return err
}
*lastCursor = 0
return fmt.Errorf("got FutureCursor frame, reset cursor tracking for host")
default:
return fmt.Errorf("error frame: %s: %s", errf.Error, errf.Message)
}
},
}
lims := s.GetOrCreateLimiters(host.ID, int64(host.RateLimit), host.HourlyEventLimit, host.DailyEventLimit)
limiters := []*slidingwindow.Limiter{
lims.PerSecond,
lims.PerHour,
lims.PerDay,
}
instrumentedRSC := events.NewInstrumentedRepoStreamCallbacks(limiters, rsc.EventHandler)
pool := parallel.NewScheduler(
100,
1_000,
con.RemoteAddr().String(),
instrumentedRSC.EventHandler,
)
return events.HandleRepoStream(ctx, con, pool)
}
func (s *Slurper) updateCursor(sub *activeSub, curs int64) error {
sub.lk.Lock()
defer sub.lk.Unlock()
sub.pds.Cursor = curs
return nil
}
type cursorSnapshot struct {
id uint
cursor int64
}
// flushCursors updates the PDS cursors in the DB for all active subscriptions
func (s *Slurper) flushCursors(ctx context.Context) []error {
ctx, span := otel.Tracer("feedmgr").Start(ctx, "flushCursors")
defer span.End()
var cursors []cursorSnapshot
s.lk.Lock()
// Iterate over active subs and copy the current cursor
for _, sub := range s.active {
sub.lk.RLock()
cursors = append(cursors, cursorSnapshot{
id: sub.pds.ID,
cursor: sub.pds.Cursor,
})
sub.lk.RUnlock()
}
s.lk.Unlock()
errs := []error{}
tx := s.db.WithContext(ctx).Begin()
for _, cursor := range cursors {
if err := tx.WithContext(ctx).Model(models.PDS{}).Where("id = ?", cursor.id).UpdateColumn("cursor", cursor.cursor).Error; err != nil {
errs = append(errs, err)
}
}
if err := tx.WithContext(ctx).Commit().Error; err != nil {
errs = append(errs, err)
}
return errs
}
func (s *Slurper) GetActiveList() []string {
s.lk.Lock()
defer s.lk.Unlock()
var out []string
for k := range s.active {
out = append(out, k)
}
return out
}
var ErrNoActiveConnection = fmt.Errorf("no active connection to host")
func (s *Slurper) KillUpstreamConnection(host string, block bool) error {
s.lk.Lock()
defer s.lk.Unlock()
ac, ok := s.active[host]
if !ok {
return fmt.Errorf("killing connection %q: %w", host, ErrNoActiveConnection)
}
ac.cancel()
if block {
if err := s.db.Model(models.PDS{}).Where("id = ?", ac.pds.ID).UpdateColumn("blocked", true).Error; err != nil {
return fmt.Errorf("failed to set host as blocked: %w", err)
}
}
return nil
}