commit a1f1d4a14a0341ad215cbe15859791d4f92b6fb5 · edavis.dev/monarch

+82

cmd/backfiller/backend.go

···

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       package main

     

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       import (

     

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       	"context"

     

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       	"errors"

     

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       	"fmt"

     

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       	"log/slog"

     

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       	"sync"

     

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       	"time"

     

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       	comatproto "github.com/bluesky-social/indigo/api/atproto"

     

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       	"github.com/bluesky-social/indigo/backfill"

     

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       	"gorm.io/gorm"

     

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       )

     

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       type Backend struct {

     

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       	state   *gorm.DB

     

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       	bf      *backfill.Backfiller

     

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       	seqLk   sync.Mutex

     

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       	lastSeq int64

     

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       }

     

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       func NewBackend(state *gorm.DB, bf *backfill.Backfiller) *Backend {

     

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       	return &Backend{

     

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       		state: state,

     

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       		bf:    bf,

     

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       	}

     

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       }

     

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       func (b *Backend) RepoCommitHandler(ctx context.Context, evt *comatproto.SyncSubscribeRepos_Commit) error {

     

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       	b.seqLk.Lock()

     

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       	if evt.Seq > b.lastSeq {

     

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       		b.lastSeq = evt.Seq

     

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       	}

     

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       	b.seqLk.Unlock()

     

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       	job, err := b.bf.Store.GetJob(ctx, evt.Repo)

     

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       	if job == nil {

     

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       		if errors.Is(err, backfill.ErrJobNotFound) {

     

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       			return nil

     

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       		} else {

     

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       			return fmt.Errorf("error getting job: %w", err)

     

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       		}

     

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       	} else {

     

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       		return b.bf.HandleEvent(ctx, evt)

     

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       	}

     

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       }

     

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       func (b *Backend) LoadCursor() (int, error) {

     

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       	var rec cursorRecord

     

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       	if err := b.state.Find(&rec, "id = 1").Error; err != nil {

     

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       		return 0, err

     

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       	}

     

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       	if rec.ID == 0 {

     

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       		if err := b.state.Create(&cursorRecord{ID: 1}).Error; err != nil {

     

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       			return 0, err

     

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       		}

     

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       	}

     

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       	return rec.Val, nil

     

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       }

     

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       func (b *Backend) FlushCursor() error {

     

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       	b.seqLk.Lock()

     

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       	v := b.lastSeq

     

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       	b.seqLk.Unlock()

     

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       	if err := b.state.Model(cursorRecord{}).Where("id = 1 and val < ?", v).Update("val", v).Error; err != nil {

     

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       		return err

     

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       	}

     

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       	return nil

     

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       }

     

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       func (b *Backend) syncCursorRoutine() {

     

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       	for range time.Tick(time.Second * 5) {

     

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       		if err := b.FlushCursor(); err != nil {

     

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       			slog.Error("failed to flush cursor", "err", err)

     

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       		}

     

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       	}

     

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       }

+33 -24

cmd/backfiller/backfiller.go

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       import (

     

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       	"context"

     

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       	"errors"

     

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       	"fmt"

     

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       	"log"

     

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       	"log/slog"

     

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       	"net/http"

     

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       	"os"

     

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       	"os/signal"

     

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       	"strconv"

     

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       	"syscall"

     

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       	"time"

     

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       	"github.com/bluesky-social/indigo/api/atproto"

     

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       	comatproto "github.com/bluesky-social/indigo/api/atproto"

     

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       	"github.com/bluesky-social/indigo/backfill"

     

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       	"github.com/bluesky-social/indigo/events"

     

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       	"github.com/bluesky-social/indigo/events/schedulers/parallel"

     
···

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       	"gorm.io/gorm"

     

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       	"gorm.io/gorm/logger"

     

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       )

     

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       type cursorRecord struct {

     

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       	ID  uint `gorm:"primaryKey"`

     

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       	Val int

     

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       }

     

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       func handleCreate(ctx context.Context, repo, rev, path string, rec *[]byte, cid *cid.Cid) error {

     

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       	return nil

     
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       	newLogger := logger.New(

     

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       		log.New(os.Stdout, "\n", log.LstdFlags),

     

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       		logger.Config{

     

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       			SlowThreshold: 5*time.Second,

     

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       			Colorful: false,

     

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       			SlowThreshold: 5 * time.Second,

     

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       			Colorful:      false,

     

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       		},

     

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       	)

     

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       	db, err := gorm.Open(sqlite.Open("state.db"), &gorm.Config{

     
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       		sl.Error("failed to connect to database", "err", err)

     

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       	}

     

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       	db.AutoMigrate(&backfill.GormDBJob{})

     

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       	db.AutoMigrate(&cursorRecord{})

     

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       	store := backfill.NewGormstore(db)

     

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       	// connect to the relay

     

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       	con, _, err := websocket.DefaultDialer.Dial("wss://bsky.network/xrpc/com.atproto.sync.subscribeRepos", http.Header{

     

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       		"User-Agent": []string{"backfiller/0.1 (@edavis.dev)"},

     

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       	})

     

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       	if err != nil {

     

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       		sl.Error("failed to connect to relay", "err", err)

     

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       	}

     

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       	// start backfilling

     

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       	// create and start the backfiller

     

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       	opts := &backfill.BackfillOptions{

     

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       		ParallelBackfills:     10,

     

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       		ParallelRecordCreates: 100,

     
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       	bf := backfill.NewBackfiller("backfills", store, handleCreate, handleUpdate, handleDelete, opts)

     

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       	go bf.Start()

     

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       	// set up the backend service

     

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       	backend := NewBackend(db, bf)

     

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       	go backend.syncCursorRoutine()

     

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       	// connect to the relay

     

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       	subscribeUrl := "wss://bsky.network/xrpc/com.atproto.sync.subscribeRepos"

     

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       	curs, err := backend.LoadCursor()

     

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       	if err != nil {

     

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       		sl.Error("error loading firehose cursor", "err", err)

     

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       	}

     

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       	if curs > 0 {

     

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       		subscribeUrl += "?cursor=" + strconv.Itoa(curs)

     

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       	}

     

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       	con, _, err := websocket.DefaultDialer.Dial(subscribeUrl, http.Header{

     

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       		"User-Agent": []string{"backfiller/0.1 (@edavis.dev)"},

     

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       	})

     

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       	if err != nil {

     

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       		sl.Error("failed to connect to relay", "err", err)

     

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       	}

     

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       	// pump repos

     

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       	go func(ctx context.Context, bf *backfill.Backfiller) {

     

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       		if err := pumpRepos(ctx, bf); err != nil {

     
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       	// read from the firehose

     

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       	rsc := events.RepoStreamCallbacks{

     

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       		RepoCommit: func(evt *comatproto.SyncSubscribeRepos_Commit) error {

     

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       			job, err := bf.Store.GetJob(ctx, evt.Repo)

     

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       			if job == nil {

     

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       				if errors.Is(err, backfill.ErrJobNotFound) {

     

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       					return nil

     

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       				} else {

     

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       					return fmt.Errorf("error getting job: %w", err)

     

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       				}

     

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       			} else {

     

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       				return bf.HandleEvent(ctx, evt)

     

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       			}

     

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       		RepoCommit: func(evt *atproto.SyncSubscribeRepos_Commit) error {

     

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       			return backend.RepoCommitHandler(ctx, evt)

     

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       		},

     

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       	}

     

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       	sched := parallel.NewScheduler(16, 100, "firehose", rsc.EventHandler)