commit 14bd694b3c83a9c224e7547c0cc40f14d109c3a5 · edavis.dev/bsky-feeds

+4 -1

Makefile

···

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       -
       all: bin/mostliked bin/feedweb

     

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       all: bin/videostream bin/mostliked bin/feedweb

     

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       bin/videostream: cmd/videostream/*.go pkg/videostream/*.go

     

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       	go build -o $@ ./cmd/videostream

     

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       bin/mostliked: cmd/mostliked/main.go pkg/mostliked/handler.go db/mostliked/*.go pkg/feeds/*.go

     

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       	go build -o $@ ./cmd/mostliked

+67

cmd/videostream/main.go

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       package main

     

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       import (

     

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       	"context"

     

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       	"database/sql"

     

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       	"log"

     

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       	"os"

     

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       	"os/signal"

     

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       	"syscall"

     

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       	jetstream "github.com/bluesky-social/jetstream/pkg/models"

     

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       	"github.com/edavis/bsky-feeds/pkg/videostream"

     

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       	"github.com/gorilla/websocket"

     

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       	_ "github.com/mattn/go-sqlite3"

     

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       )

     

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       const JetstreamUrl = `wss://jetstream2.us-west.bsky.network/subscribe?wantedCollections=app.bsky.feed.post`

     

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       func main() {

     

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       	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGINT, syscall.SIGTERM)

     

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       	defer stop()

     

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       +
       

     

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       	conn, _, err := websocket.DefaultDialer.DialContext(ctx, JetstreamUrl, nil)

     

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       	if err != nil {

     

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       		log.Fatalf("failed to open websocket: %v\n", err)

     

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       	}

     

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       	defer func() {

     

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       		if err := conn.Close(); err != nil {

     

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       			log.Printf("failed to close websocket: %v\n", err)

     

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       		}

     

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       		log.Printf("websocket closed\n")

     

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       	}()

     

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       	dbCnx, err := sql.Open("sqlite3", "data/videostream.db?_journal=WAL&_fk=on&_timeout=5000&_sync=1&_txlock=immediate")

     

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       	if err != nil {

     

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       		log.Fatalf("failed to open database: %v\n", err)

     

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       	}

     

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       	defer func() {

     

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       		if _, err := dbCnx.Exec("PRAGMA wal_checkpoint(TRUNCATE)"); err != nil {

     

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       			log.Printf("error doing final WAL checkpoint: %v\n", err)

     

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       		}

     

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       		if err := dbCnx.Close(); err != nil {

     

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       			log.Printf("failed to close db: %v\n", err)

     

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       		}

     

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       		log.Printf("db closed\n")

     

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       	}()

     

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       	queue := videostream.NewQueue(1000)

     

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       	go videostream.Handler(ctx, queue, dbCnx)

     

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       	log.Printf("starting up\n")

     

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       	go func() {

     

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       		for {

     

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       			var event jetstream.Event

     

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       			err := conn.ReadJSON(&event)

     

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       			if err != nil {

     

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       				log.Printf("ReadJSON error: %v\n", err)

     

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       				stop()

     

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       				break

     

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       			}

     

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       			queue.Enqueue(event)

     

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       		}

     

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       	}()

     

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       	<-ctx.Done()

     

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       	log.Printf("shutting down\n")

     

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       }

pkg/videostream/checkpoint.go

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       package videostream

     

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       type CheckpointResults struct {

     

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       	Blocked     int

     

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       	Pages       int

     

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       	Transferred int

     

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       }

pkg/videostream/generator.go

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       package videostream

+107

pkg/videostream/handler.go

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       package videostream

     

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       import (

     

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       	"context"

     

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       	"database/sql"

     

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       	_ "embed"

     

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       	"encoding/json"

     

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       	"fmt"

     

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       	"log"

     

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       	"time"

     

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       	appbsky "github.com/bluesky-social/indigo/api/bsky"

     

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       	jetstream "github.com/bluesky-social/jetstream/pkg/models"

     

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       	"github.com/edavis/bsky-feeds/pkg/feeds"

     

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       	_ "github.com/mattn/go-sqlite3"

     

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       )

     

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       //go:embed schema.sql

     

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       var ddl string

     

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       func Handler(ctx context.Context, events *Queue, dbCnx *sql.DB) {

     

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       	var (

     

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       		dbTx       *sql.Tx

     

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       		err        error

     

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       		eventCount int

     

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       	)

     

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       	if _, err = dbCnx.ExecContext(ctx, ddl); err != nil {

     

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       		log.Printf("could not create tables: %v\n", err)

     

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       	}

     

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       	if _, err = dbCnx.ExecContext(ctx, `PRAGMA wal_autocheckpoint = 0`); err != nil {

     

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       		log.Printf("could not set PRAGMA wal_autocheckpoint: %v\n", err)

     

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       	}

     

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       	for {

     

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       		select {

     

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       		case <-ctx.Done():

     

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       			return

     

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       		default:

     

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       		}

     

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       		event, ok := events.Dequeue()

     

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       		if !ok {

     

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       			time.Sleep(100 * time.Millisecond)

     

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       			continue

     

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       		}

     

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       		if dbTx == nil {

     

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       			dbTx, err = dbCnx.BeginTx(ctx, nil)

     

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       			if err != nil {

     

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       				log.Printf("failed to begin transaction: %v\n", err)

     

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       			}

     

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       		}

     

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       		if event.Kind != jetstream.EventKindCommit {

     

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       			continue

     

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       		}

     

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       		if event.Commit.Operation != jetstream.CommitOperationCreate {

     

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       			continue

     

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       		}

     

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       		commit := *event.Commit

     

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       		var post appbsky.FeedPost

     

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       		if err = json.Unmarshal(commit.Record, &post); err != nil {

     

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       			log.Printf("error parsing commit.Record: %v\n", err)

     

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       			continue

     

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       		}

     

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       		if post.Embed != nil && post.Embed.EmbedVideo != nil {

     

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       			uri := fmt.Sprintf("at://%s/%s/%s", event.Did, commit.Collection, commit.RKey)

     

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       			ts := feeds.SafeTimestamp(post.CreatedAt)

     

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       			dbTx.ExecContext(ctx, `insert or ignore into posts (uri, create_ts) values (?, ?)`, uri, ts)

     

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       		} else {

     

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       			continue

     

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       		}

     

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       		eventCount += 1

     

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       		if eventCount%25 == 0 {

     

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       			// TODO trim

     

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       			if err = dbTx.Commit(); err != nil {

     

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       				log.Printf("commit failed: %v\n", err)

     

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       			}

     

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       			var results CheckpointResults

     

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       			err = dbCnx.QueryRowContext(ctx, `PRAGMA wal_checkpoint(RESTART)`).Scan(&results.Blocked, &results.Pages, &results.Transferred)

     

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       			switch {

     

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       			case err != nil:

     

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       				log.Printf("failed checkpoint: %v\n", err)

     

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       			case results.Blocked == 1:

     

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       				log.Printf("checkpoint: blocked\n")

     

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       			case results.Pages == results.Transferred:

     

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       				log.Printf("checkpoint: %d pages transferred\n", results.Transferred)

     

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       			case results.Pages != results.Transferred:

     

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       				log.Printf("checkpoint: %d pages, %d transferred\n", results.Pages, results.Transferred)

     

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       			}

     

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       			dbTx, err = dbCnx.BeginTx(ctx, nil)

     

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       			if err != nil {

     

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       				log.Printf("failed to begin transaction: %v\n", err)

     

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       			}

     

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       			log.Printf("queue size: %d\n", events.Size())

     

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       		}

     

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       	}

     

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       }

+46

pkg/videostream/queue.go

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       package videostream

     

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       import (

     

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       	"sync"

     

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       	jetstream "github.com/bluesky-social/jetstream/pkg/models"

     

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       )

     

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       type Queue struct {

     

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       	lk     sync.Mutex

     

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       	events []jetstream.Event

     

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       }

     

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       func NewQueue(capacity int) *Queue {

     

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       	return &Queue{

     

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       		events: make([]jetstream.Event, 0, capacity),

     

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       	}

     

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       }

     

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       func (q *Queue) Enqueue(event jetstream.Event) {

     

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       	q.lk.Lock()

     

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       	defer q.lk.Unlock()

     

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       	q.events = append(q.events, event)

     

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       }

     

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       func (q *Queue) Dequeue() (jetstream.Event, bool) {

     

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       	q.lk.Lock()

     

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       	defer q.lk.Unlock()

     

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       +
       

     

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       	if len(q.events) == 0 {

     

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       		var e jetstream.Event

     

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       		return e, false

     

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       	}

     

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       +
       

     

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       	event := q.events[0]

     

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       	q.events = q.events[1:]

     

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       	return event, true

     

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       +
       }

     

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       +
       

     

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       func (q *Queue) Size() int {

     

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       	q.lk.Lock()

     

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       	defer q.lk.Unlock()

     

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       +
       

     

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       	return len(q.events)

     

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       +
       }

pkg/videostream/schema.sql

···

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       create table if not exists posts (

     

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         uri text primary key,

     

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         create_ts int not null

     

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       );

     

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       create index if not exists ts_idx on posts(create_ts);