commit cc1b20a8ab251edc67a39f9b804b71404598ebc2 · hailey.at/peruse

+136

peruse/handle_baseball_feed.go

···

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       package peruse

     

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       import (

     

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       	"context"

     

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       	"fmt"

     

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       	"log/slog"

     

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       	"strconv"

     

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       	"sync"

     

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       	"time"

     

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       +
       

     

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       	"github.com/ClickHouse/clickhouse-go/v2/lib/driver"

     

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       	"github.com/haileyok/peruse/internal/helpers"

     

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       	"github.com/labstack/echo/v4"

     

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       )

     

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       type BaseballFeed struct {

     

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       	conn           driver.Conn

     

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       	logger         *slog.Logger

     

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       	cached         []BaseballPost

     

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       	cacheExpiresAt time.Time

     

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       	mu             sync.RWMutex

     

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       }

     

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       type BaseballPost struct {

     

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       	LikeCt     uint64    `ch:"like_ct"`

     

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       	Uri        string    `ch:"uri"`

     

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       	CreatedAt  time.Time `ch:"created_at"`

     

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       	HoursOld   uint64    `ch:"hours_old"`

     

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       	DecayScore float64   `ch:"decay_score"`

     

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       }

     

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       func NewBaseballFeed(s *Server) *BaseballFeed {

     

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       	logger := s.logger.With("feed", "baseball-feed")

     

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       	return &BaseballFeed{

     

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       		conn:   s.conn,

     

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       		logger: logger,

     

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       		cached: nil,

     

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       	}

     

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       }

     

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       func (f *BaseballFeed) Name() string {

     

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       	return "baseball"

     

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       }

     

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       func (f *BaseballFeed) HandleGetFeedSkeleton(e echo.Context, req FeedSkeletonRequest) error {

     

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       	ctx := e.Request().Context()

     

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       	cursor := time.Now()

     

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       	if req.Cursor != "" {

     

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       		maybeCursor, err := msToTime(req.Cursor)

     

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       		if err != nil {

     

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       			f.logger.Error("error getting time from cursor", "error", err)

     

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       			return helpers.InputError(e, "InputError", "Invalid cursor for feed")

     

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       		}

     

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       		cursor = maybeCursor

     

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       	}

     

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       	posts, err := f.getPosts(ctx)

     

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       	if err != nil {

     

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       		f.logger.Error("error getting posts", "error", err)

     

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       		return helpers.ServerError(e, "FeedError", "Unable to get posts for feed")

     

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       	}

     

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       	if len(posts) == 0 {

     

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       		return helpers.ServerError(e, "FeedError", "Not enough posts")

     

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       	}

     

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       	for i, p := range posts {

     

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       		if p.CreatedAt.Before(cursor) {

     

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       			posts = posts[i:]

     

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       			break

     

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       		}

     

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       	}

     

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       	if len(posts) > 30 {

     

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       		posts = posts[:30]

     

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       	}

     

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       	var items []FeedPostItem

     

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       	for _, p := range posts {

     

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       		items = append(items, FeedPostItem{Post: p.Uri})

     

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       	}

     

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       	newCursor := fmt.Sprintf("%d", posts[len(posts)-1].CreatedAt.UnixMilli())

     

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       	return e.JSON(200, FeedSkeletonResponse{

     

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       		Feed:   items,

     

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       		Cursor: &newCursor,

     

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       	})

     

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       }

     

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       func (f *BaseballFeed) getPosts(ctx context.Context) ([]BaseballPost, error) {

     

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       	f.mu.RLock()

     

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       	f.mu.RUnlock()

     

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       	if f.cached != nil && time.Now().Before(f.cacheExpiresAt) {

     

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       		return f.cached, nil

     

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       	}

     

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       	f.mu.Lock()

     

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       	defer f.mu.Unlock()

     

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       	if f.cached != nil && time.Now().Before(f.cacheExpiresAt) {

     

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       		return f.cached, nil

     

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       	}

     

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       	var posts []BaseballPost

     

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       	if err := f.conn.Select(ctx, &posts, baseballQuery); err != nil {

     

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       		return nil, err

     

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       	}

     

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       	f.cached = posts

     

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       	f.cacheExpiresAt = time.Now().Add(1 * time.Minute)

     

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       	return posts, nil

     

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       }

     

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       func msToTime(ms string) (time.Time, error) {

     

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       	msInt, err := strconv.ParseInt(ms, 10, 64)

     

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       	if err != nil {

     

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       		return time.Time{}, err

     

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       	}

     

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       	return time.Unix(0, msInt*int64(time.Millisecond)), nil

     

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       }

     

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       var baseballQuery = `

     

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       SELECT 

     

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           count(*) as like_ct,

     

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           bp.uri,

     

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           bp.created_at,

     

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           dateDiff('hour', bp.created_at, now()) as hours_old,

     

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           count(*) * exp(-0.1 * dateDiff('hour', bp.created_at, now())) as decay_score

     

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       FROM baseball_post bp 

     

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       LEFT JOIN default.like_by_subject i ON bp.uri = i.subject_uri 

     

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       WHERE bp.created_at > now() - INTERVAL 1 DAY 

     

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       GROUP BY bp.uri, bp.created_at 

     

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       ORDER BY decay_score DESC

     

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       LIMIT 5000

     

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       `

+1 -1

peruse/handle_get_suggested_follows.go

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       	u := NewUser(req.Handle)

     

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       	suggs, err := u.getSuggestedFollows(ctx, s, req.ShowHandles)

     

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       	if err != nil {

     

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       		return e.String(400, fmt.Sprintf("error getting suggested follows: %v"))

     

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       		return e.String(400, fmt.Sprintf("error getting suggested follows: %v", err))

     

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       	}

     

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       	html := "<html><table><tr><th>suggested did</th><th>bsky profile</th></tr>"

+29

peruse/peruse.go

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       import (

     

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       	"context"

     

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       	"crypto"

     

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       	"fmt"

     

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       	"log/slog"

     

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       	"net/http"

     

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       	"os"

     
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       	directory   identity.Directory

     

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       	userManager *UserManager

     

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       	xrpc        *xrpc.Client

     

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       	feeds       map[string]Feed

     

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       }

     

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       type ServerArgs struct {

     
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       	ServiceEndpoint      string

     

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       	ChronoFeedRkey       string

     

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       	SuggestedFollowsRkey string

     

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       }

     

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       type Feed interface {

     

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       	Name() string

     

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       	HandleGetFeedSkeleton(e echo.Context, req FeedSkeletonRequest) error

     

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       }

     

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       func NewServer(args ServerArgs) (*Server, error) {

     
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       		xrpc: &xrpc.Client{

     

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       			Host: "https://public.api.bsky.app",

     

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       		},

     

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       		feeds: map[string]Feed{},

     

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       	}, nil

     

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       }

     

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       	ctx, cancel := context.WithCancel(ctx)

     

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       	defer cancel()

     

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       	s.addFeed(NewBaseballFeed(s))

     

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       	s.addRoutes()

     

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       	go func() {

     
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       	return nil

     

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       }

     

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       func (s *Server) addFeed(f Feed) error {

     

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       	_, exists := s.feeds[f.Name()]

     

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       	if exists {

     

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       		return fmt.Errorf("feed %s already exists", f.Name())

     

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       	}

     

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       	s.feeds[f.Name()] = f

     

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       	return nil

     

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       }

     

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       func (s *Server) addRoutes() {

     

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       	s.echo.GET("/xrpc/app.bsky.feed.getFeedSkeleton", s.handleFeedSkeleton, s.handleAuthMiddleware)

     

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       	s.echo.GET("/xrpc/app.bsky.feed.describeFeedGenerator", s.handleDescribeFeedGenerator)

     
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       		return next(e)

     

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       	}

     

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       }

     

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       func urisToFeedPostItems(uris []string) []FeedPostItem {

     

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       	var pis []FeedPostItem

     

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       	for _, u := range uris {

     

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       		pis = append(pis, FeedPostItem{

     

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       			Post: u,

     

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       		})

     

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       	}

     

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       	return pis

     

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       }