should not execute feed if version.url==""

go.mod

@@ -2,7 +2,10 @@ module show-rss
 
 go 1.23.3
 
-require modernc.org/sqlite v1.37.0
+require (
+	golang.org/x/time v0.11.0
+	modernc.org/sqlite v1.37.0
+)
 
 require (
 	github.com/PuerkitoBio/goquery v1.8.0 // indirect

go.sum

@@ -59,6 +59,8 @@ golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9sn
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.5.0 h1:OLmvp0KP+FVG99Ct/qFiL/Fhk4zp4QQnZ7b2U+5piUM=
 golang.org/x/text v0.5.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/time v0.11.0 h1:/bpjEDfN9tkoN/ryeYHnv5hcMlc8ncjMcM4XBk5NWV0=
+golang.org/x/time v0.11.0/go.mod h1:CDIdPxbZBQxdj6cxyCIdrNogrJKMJ7pr37NYpMcMDSg=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.31.0 h1:0EedkvKDbh+qistFTd0Bcwe/YLh4vHwWEkiI0toFIBU=
 golang.org/x/tools v0.31.0/go.mod h1:naFTU+Cev749tSJRXJlna0T3WxKvb1kWEx15xA4SdmQ=

install_scratch.sh

@@ -0,0 +1,3 @@
+#! /usr/bin/env bash
+
+CGO_ENABLED=1 CC=x86_64-linux-musl-gcc   go install -ldflags="-linkmode external -extldflags '-static'" 

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"os"
 	"os/signal"
 	"show-rss/src/cmd"
 	"syscall"
@@ -17,7 +18,7 @@ func Main(ctx context.Context) error {
 	ctx, can := signal.NotifyContext(ctx, syscall.SIGINT)
 	defer can()
 
-	if err := cmd.Main(ctx); err != nil && ctx.Err() == nil {
+	if err := cmd.Main(ctx, os.Args[1:]); err != nil && ctx.Err() == nil {
 		return err
 	}
 

main_test.go

@@ -2,6 +2,8 @@ package main_test
 
 import (
 	"context"
+	"os"
+	"path"
 	main "show-rss"
 	"show-rss/src/db"
 	"testing"
@@ -12,6 +14,8 @@ func TestMain(t *testing.T) {
 	ctx, can := context.WithTimeout(context.Background(), 2*time.Second)
 	defer can()
 
+	os.Args = []string{os.Args[0], "-db", path.Join(t.TempDir(), "db.db")}
+
 	if err := main.Main(db.Test(t, ctx)); err != nil && ctx.Err() == nil {
 		t.Fatal(err)
 	}

src/asses/db.go

@@ -0,0 +1,96 @@
+package asses
+
+import (
+	"context"
+	"show-rss/src/db"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+func Next(ctx context.Context) (time.Time, error) {
+	if err := initDB(ctx); err != nil {
+		return time.Time{}, err
+	}
+
+	if deadline := Deadline(); time.Since(deadline) > time.Minute {
+		return midnightLastNight().Add(24 * time.Hour), nil
+	}
+
+	type Did struct {
+		Did time.Time
+	}
+	result, err := db.QueryOne[Did](ctx, `
+		SELECT executed_at AS "Did"
+		FROM "asses.executions"
+		ORDER BY executed_at DESC
+		LIMIT 1
+	`)
+	return result.Did.Add(time.Hour), err
+}
+
+func Record(ctx context.Context) error {
+	if err := initDB(ctx); err != nil {
+		return err
+	}
+
+	return db.Exec(ctx, `INSERT INTO "asses.executions" (id, executed_at) VALUES ($1, $2)`, uuid.New().String(), time.Now())
+}
+
+type last struct {
+	T        time.Time `json:"checked_at"`
+	Cksum    string    `json:"cksum"`
+	Modified time.Time `json:"modified"`
+}
+
+func checkLast(ctx context.Context, p string) (last, error) {
+	if err := initDB(ctx); err != nil {
+		return last{}, err
+	}
+
+	return db.QueryOne[last](ctx, `
+		SELECT checked_at, cksum, modified
+		FROM "asses.checks"
+		WHERE p=$1
+	`, p)
+}
+
+func checked(ctx context.Context, p, cksum string, modified time.Time) error {
+	if err := initDB(ctx); err != nil {
+		return err
+	}
+
+	if cksum != "" {
+	} else if err := db.Exec(ctx, `
+		UPDATE "asses.checks"
+		SET checked_at=$2, modified=$3
+		WHERE p=$1
+	`, p, time.Now(), modified); err == nil {
+		return nil
+	}
+
+	return db.Exec(ctx, `
+		INSERT INTO "asses.checks"
+		(p, checked_at, cksum, modified)
+		VALUES ($1, $2, $3, $4)
+
+		ON CONFLICT DO UPDATE
+		SET checked_at=$2, cksum=$3, modified=$4
+		WHERE p=$1
+	`, p, time.Now(), cksum, modified)
+}
+
+func initDB(ctx context.Context) error {
+	return db.InitializeSchema(ctx, "asses", []string{
+		`CREATE TABLE "asses.executions" (
+			id TEXT PRIMARY KEY NOT NULL,
+			executed_at TIMESTAMP NOT NULL
+		)`,
+		`CREATE TABLE "asses.checks" (
+			p TEXT PRIMARY KEY NOT NULL,
+			checked_at TIMESTAMP NOT NULL,
+			cksum TEXT NOT NULL
+		)`,
+		`ALTER TABLE "asses.checks" ADD COLUMN "modified" TIMESTAMP`,
+	})
+}

src/asses/db_integration_test.go

@@ -0,0 +1,29 @@
+package asses_test
+
+import (
+	"context"
+	"show-rss/src/asses"
+	"show-rss/src/db"
+	"testing"
+	"time"
+)
+
+func TestNextRecord(t *testing.T) {
+	ctx := db.Test(t, context.Background())
+
+	if v, err := asses.Next(ctx); err != nil {
+		t.Fatal(err)
+	} else if zero := v.IsZero(); !zero && time.Now().Hour() < 8 {
+		t.Fatal(v)
+	}
+
+	if err := asses.Record(ctx); err != nil {
+		t.Fatal(err)
+	}
+
+	if v, err := asses.Next(ctx); err != nil {
+		t.Fatal(err)
+	} else if since := time.Since(v); since > time.Minute && time.Now().Hour() < 8 {
+		t.Fatal(since)
+	}
+}

src/asses/db_test.go

@@ -0,0 +1,34 @@
+package asses
+
+import (
+	"context"
+	"math"
+	"show-rss/src/db"
+	"testing"
+	"time"
+)
+
+func TestLast(t *testing.T) {
+	ctx := db.Test(t, context.Background())
+
+	if last, err := checkLast(ctx, "p"); err != nil {
+		t.Fatal(err)
+	} else if !last.T.IsZero() || last.Cksum != "" {
+		t.Fatal(last)
+	}
+
+	modtime := time.Now().Add(-5 * time.Minute)
+	if err := checked(ctx, "p", "cksum", modtime); err != nil {
+		t.Fatal(err)
+	} else if err := checked(ctx, "p", "cksum", modtime); err != nil {
+		t.Fatal(err)
+	}
+
+	if last, err := checkLast(ctx, "p"); err != nil {
+		t.Fatal(err)
+	} else if last.T.IsZero() || last.Cksum != "cksum" {
+		t.Fatal(last)
+	} else if math.Abs(float64(last.Modified.Sub(modtime))) > float64(time.Second) {
+		t.Fatalf("modified not uploaded: %v vs. %v (diff of %v)", last.Modified, modtime, last.Modified.Sub(modtime))
+	}
+}

src/asses/deadline.go

@@ -0,0 +1,15 @@
+package asses
+
+import "time"
+
+func Deadline() time.Time {
+	return midnightLastNight().Add(8 * time.Hour) // midnight-8AM
+}
+
+func midnightLastNight() time.Time {
+	t, err := time.ParseInLocation("2006-01-02", time.Now().Format("2006-01-02"), time.Local)
+	if err != nil {
+		panic(err)
+	}
+	return t
+}

src/asses/deport.go

@@ -0,0 +1,247 @@
+package asses
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"regexp"
+	"slices"
+	"strings"
+	"time"
+)
+
+func Entrypoint(ctx context.Context, p string) error {
+	return deport(ctx, p)
+}
+
+func deport(ctx context.Context, p string) error {
+	if os.Getenv("NO_DEPORT") != "" {
+		log.Printf("would deport %s", p)
+		return nil
+	}
+
+	assStreams, err := assStreams(ctx, p)
+	if err != nil {
+		return err
+	}
+
+	assStreamIDs := make([]string, len(assStreams))
+	for i, stream := range assStreams {
+		assStreamIDs[i] = stream.id
+		assF := path.Join(
+			path.Dir(p),
+			fmt.Sprintf(
+				".%s.%s.%s.ass",
+				path.Base(p),
+				stream.id,
+				stream.title,
+			),
+		)
+		if err := ffmpeg(ctx, "-y", "-i", p, "-map", stream.id, assF); err != nil {
+			return fmt.Errorf("failed to pull %s from %s: %w", stream.id, p, err)
+		}
+	}
+
+	if err := BestAssToSRT(ctx, p); err != nil {
+		return err
+	}
+
+	base := path.Base(p)
+	withoutExt := strings.TrimSuffix(base, path.Ext(base))
+	p2 := path.Join(path.Dir(p), fmt.Sprintf("%s.subless.mkv", withoutExt))
+	args := []string{
+		"-i", p,
+		"-map", "0",
+	}
+	for _, assStream := range assStreams {
+		args = append(args, "-map", "-"+assStream.id)
+	}
+	args = append(args,
+		"-c", "copy",
+		p2,
+	)
+	if err := ffmpeg(ctx, args...); err != nil {
+		return err
+	} else if err := os.Rename(p2, p); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+type stream struct {
+	id    string
+	title string
+}
+
+func assStreams(ctx context.Context, p string) ([]stream, error) {
+	output, err := ffprobe(ctx, "-i", p)
+	if err != nil {
+		return nil, err
+	}
+
+	result := []stream{}
+	for _, line := range strings.Split(output, "\n") {
+		fields := strings.Fields(line)
+		if len(fields) < 3 {
+			continue
+		} else if fields[0] != "Stream" {
+			continue
+		} else if !strings.Contains(fields[1], "(") {
+			continue
+		} else if fields[2] != "Subtitle:" {
+			continue
+		} else if fields[3] != "ass" {
+			continue
+		}
+		field1 := fields[1]
+		id := strings.Trim(strings.Split(field1, "(")[0], "#")
+		title := strings.Trim(strings.Split(field1, "(")[1], "):")
+		result = append(result, stream{
+			id:    id,
+			title: title,
+		})
+	}
+	return result, nil
+}
+
+func ffprobe(ctx context.Context, args ...string) (string, error) {
+	return execc(ctx, "ffprobe", args...)
+}
+
+func ffmpeg(ctx context.Context, args ...string) error {
+	std, err := execc(ctx, "ffmpeg", args...)
+	if err != nil {
+		return fmt.Errorf("(%w) %s", err, std)
+	}
+	return nil
+}
+
+func execc(ctx context.Context, bin string, args ...string) (string, error) {
+	stdout := bytes.NewBuffer(nil)
+
+	cmd := exec.CommandContext(ctx, bin, args...)
+	cmd.Stdin = nil
+	cmd.Stderr = stdout
+	cmd.Stdout = stdout
+
+	err := cmd.Run()
+	return string(stdout.Bytes()), err
+}
+
+func BestAssToSRT(ctx context.Context, p string) error {
+	asses, err := filepath.Glob(path.Join(
+		path.Dir(p),
+		fmt.Sprintf(".%s.*.ass", path.Base(p)),
+	))
+	if err != nil {
+		return err
+	}
+
+	srts := []string{}
+	for _, ass := range asses {
+		srt, err := assToSRT(ctx, ass)
+		if err != nil {
+			return err
+		}
+		srts = append(srts, srt)
+	}
+
+	srts = SRTsByGoodness(srts)
+
+	for i := range srts {
+		if i == 0 {
+			base := path.Base(p)
+			withoutExt := strings.TrimSuffix(base, path.Ext(base))
+
+			srt := path.Join(path.Dir(p), fmt.Sprintf("%s.srt", withoutExt))
+			if err := os.Rename(srts[i], srt); err != nil {
+				return err
+			}
+		} else {
+			os.Remove(srts[i])
+		}
+	}
+
+	return nil
+}
+
+func assToSRT(ctx context.Context, ass string) (string, error) {
+	ctx, can := context.WithTimeout(ctx, 30*time.Second)
+	defer can()
+
+	srt := fmt.Sprintf("%s.srt", strings.TrimSuffix(ass, ".ass"))
+	if _, err := os.Stat(srt); err == nil {
+		return srt, nil
+	}
+
+	if err := ffmpeg(ctx, "-y", "-i", ass, srt); err != nil {
+		if ctx.Err() == nil {
+			log.Printf("ffmpeg failed to process %s; removing", ass)
+			os.Remove(ass)
+		}
+		return srt, err
+	}
+
+	b, err := os.ReadFile(srt)
+	if err != nil {
+		return srt, err
+	}
+	before := len(b)
+	b = regexp.MustCompile(`size="[^"]*"`).ReplaceAll(b, []byte{})
+	if after := len(b); before == after {
+	} else if err := os.WriteFile(srt, b, os.ModePerm); err != nil {
+		return srt, err
+	}
+	return srt, nil
+}
+
+func SRTsByGoodness(srts []string) []string {
+	skippers := []*regexp.Regexp{
+		regexp.MustCompile(`(?i)lat.*amer`),
+		regexp.MustCompile(`(?i)signs`),
+		regexp.MustCompile(`(?i)rus`),
+		regexp.MustCompile(`(?i)por`),
+		regexp.MustCompile(`(?i)ita`),
+		regexp.MustCompile(`(?i)fre`),
+		regexp.MustCompile(`(?i)spa`),
+		regexp.MustCompile(`(?i)ger`),
+		regexp.MustCompile(`(?i)ara`),
+		regexp.MustCompile(`(?i)jpn`),
+		regexp.MustCompile(`(?i)urop`),
+		regexp.MustCompile(`(?i)razil`),
+		regexp.MustCompile(`(?i)Deu`),
+		regexp.MustCompile(`(?i)ara`),
+	}
+
+	keepers := []*regexp.Regexp{
+		regexp.MustCompile(`(?i)^eng$`),
+	}
+
+	srts = slices.Clone(srts)
+	slices.SortFunc(srts, func(a, b string) int {
+		a = strings.ToLower(a)
+		b = strings.ToLower(b)
+		for _, skipper := range skippers {
+			if skipper.MatchString(b) {
+				return -1
+			} else if skipper.MatchString(a) {
+				return 1
+			}
+		}
+		for _, keeper := range keepers {
+			if keeper.MatchString(a) {
+				return -1
+			} else if keeper.MatchString(b) {
+				return 1
+			}
+		}
+		return strings.Compare(a, b)
+	})
+	return srts
+}

src/asses/deport_test.go

@@ -0,0 +1,47 @@
+package asses_test
+
+import (
+	"show-rss/src/asses"
+	"testing"
+)
+
+func TestSRTsByGoodness(t *testing.T) {
+	cases := map[string]struct {
+		given []string
+		want  string
+	}{
+		"eng": {
+			given: []string{"a", "eng"},
+			want:  "eng",
+		},
+		"eng nocap": {
+			given: []string{"A", "eng"},
+			want:  "eng",
+		},
+		".Apothecary_Diaries_S02E19.mkv.0:9.ita.ass": {
+			given: []string{
+				".Apothecary_Diaries_S02E19.mkv.0:10.rus.srt",
+				".Apothecary_Diaries_S02E19.mkv.0:2.eng.srt",
+				".Apothecary_Diaries_S02E19.mkv.0:3.por.srt",
+				".Apothecary_Diaries_S02E19.mkv.0:4.spa.srt",
+				".Apothecary_Diaries_S02E19.mkv.0:5.spa.srt",
+				".Apothecary_Diaries_S02E19.mkv.0:6.ara.srt",
+				".Apothecary_Diaries_S02E19.mkv.0:7.fre.srt",
+				".Apothecary_Diaries_S02E19.mkv.0:8.ger.srt",
+				".Apothecary_Diaries_S02E19.mkv.0:9.ita.srt",
+			},
+			want: ".Apothecary_Diaries_S02E19.mkv.0:2.eng.srt",
+		},
+	}
+
+	for name, d := range cases {
+		name := name
+		c := d
+		t.Run(name, func(t *testing.T) {
+			got := asses.SRTsByGoodness(c.given)
+			if got[0] != c.want {
+				t.Errorf("expected %s but got %s (%+v)", c.want, got[0], got)
+			}
+		})
+	}
+}

src/asses/one.go

@@ -0,0 +1,125 @@
+package asses
+
+import (
+	"context"
+	"crypto/md5"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"log"
+	"math/rand"
+	"os"
+	"path"
+	"show-rss/src/slow"
+	"strconv"
+	"time"
+
+	"golang.org/x/time/rate"
+)
+
+var EnvCksumBPS = func() int {
+	s := os.Getenv("CKSUM_BPS")
+	if s == "" {
+		return 50_000_000
+	}
+	n, err := strconv.Atoi(s)
+	if err != nil || n < 1 {
+		panic(err)
+	}
+	return n
+}()
+
+func One(ctx context.Context, p string) error {
+	shortp := path.Join("...", path.Base(path.Dir(p)), path.Base(p))
+
+	last, err := checkLast(ctx, p)
+	if err != nil {
+		return err
+	}
+
+	threshold := 20 + rand.New(rand.NewSource(func() int64 {
+		b := md5.New().Sum([]byte(p))
+		var sum int64
+		for _, c := range b {
+			sum += int64(c)
+			sum *= int64(c)
+		}
+		return sum
+	}())).Int()%10
+	if daysSince := int(time.Since(last.T).Hours() / 24); daysSince > threshold {
+		log.Printf("asses.One(%s) // no modified check as %vd since last check", shortp, daysSince)
+	} else if stat, err := os.Stat(p); err != nil {
+		return fmt.Errorf("cannot stat %s: %w", p, err)
+	} else if stat.ModTime() == last.Modified {
+		//log.Printf("asses.One(%s) // unmodified since %v", shortp, last.T)
+		return nil
+	} else {
+		log.Printf("asses.One(%s) // modified (%v) is now %v", shortp, last.Modified, stat.ModTime())
+	}
+
+	doCksum := true
+	if err := func() error {
+		if len(last.Cksum) > 0 {
+			if last.Modified.IsZero() {
+				doCksum = false
+				log.Printf("asses.One(%s) // assume cksum unchanged given null modified ", shortp)
+				return nil
+			}
+
+			cksum, err := Cksum(ctx, p)
+			if err != nil {
+				return err
+			}
+
+			if cksum == last.Cksum {
+				log.Printf("asses.One(%s) // cksum unchanged since %v", shortp, last.T)
+				return nil
+			}
+		}
+
+		log.Printf("asses.deport(%s)...", shortp)
+		if err := deport(ctx, p); err != nil {
+			return err
+		}
+
+		log.Printf("asses.transcode(%s)...", shortp)
+		if err := transcode(ctx, p); err != nil {
+			return err
+		}
+
+		return nil
+	}(); err != nil {
+		return err
+	}
+
+	var cksum string
+	if doCksum {
+		var err error
+		cksum, err = Cksum(ctx, p)
+		if err != nil {
+			return err
+		}
+	}
+	stat, err := os.Stat(p)
+	if err != nil {
+		return err
+	}
+	if err := checked(ctx, p, cksum, stat.ModTime()); err != nil {
+		log.Printf("failed to mark %s checked: %v", shortp, err)
+		return err
+	}
+
+	return nil
+}
+
+func Cksum(ctx context.Context, p string) (string, error) {
+	f, err := os.Open(p)
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+
+	hasher := md5.New()
+	_, err = io.Copy(hasher, slow.NewReader(ctx, rate.Limit(EnvCksumBPS), f))
+	return base64.StdEncoding.EncodeToString(hasher.Sum(nil)), err
+}

src/asses/one_test.go

@@ -0,0 +1,44 @@
+package asses_test
+
+import (
+	"context"
+	"os"
+	"path"
+	"show-rss/src/asses"
+	"show-rss/src/db"
+	"testing"
+)
+
+func TestOne(t *testing.T) {
+	ctx := db.Test(t, context.Background())
+
+	os.Setenv("DO_TRANSCODE", "true")
+
+	d := t.TempDir()
+	b, _ := os.ReadFile(path.Join("testdata", "survivor_au_S11E12.smoller.mkv"))
+	p := path.Join(d, "f.mkv")
+	os.WriteFile(p, b, os.ModePerm)
+
+	t.Logf("initial cksum...")
+	cksum, _ := asses.Cksum(context.Background(), p)
+
+	t.Logf("one && one...")
+	if err := asses.One(ctx, p); err != nil {
+		t.Fatal(err)
+	} else if err := asses.One(ctx, p); err != nil {
+		t.Fatal(err)
+	}
+
+	t.Logf("test -f...")
+	if _, err := os.Stat(p); err != nil {
+		t.Fatalf("lost original mkv: %v", err)
+	} else if _, err := os.Stat(path.Join(d, "f.srt")); err != nil {
+		t.Fatalf("no new srt: %v", err)
+	}
+
+	t.Logf("final cksum...")
+	newCksum, _ := asses.Cksum(context.Background(), p)
+	if cksum == newCksum {
+		t.Fatalf("cksum unchanged")
+	}
+}

src/asses/transcode.go

@@ -0,0 +1,64 @@
+package asses
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"path"
+	"slices"
+	"strings"
+)
+
+func EntrypointTranscode(ctx context.Context, p string) error {
+	return transcode(ctx, p)
+}
+
+func transcode(ctx context.Context, p string) error {
+	if os.Getenv("NO_TRANSCODE") != "" || os.Getenv("DO_TRANSCODE") == "" {
+		log.Printf("would transcode %s but $NO_TRANSCODE=x or $DO_TRANSCODE=", p)
+		return nil
+	}
+
+	output, err := ffprobe(ctx, "-i", p)
+	if err != nil {
+		return err
+	}
+
+	h264 := slices.ContainsFunc(strings.Split(output, "\n"), func(line string) bool {
+		return strings.Contains(line, "tream #") && strings.Contains(line, "Video: ") && strings.Contains(line, "h264")
+	})
+	aac := slices.ContainsFunc(strings.Split(output, "\n"), func(line string) bool {
+		return strings.Contains(line, "tream #") && strings.Contains(line, "Audio: ") && strings.Contains(line, "aac")
+	})
+
+	if h264 && aac {
+		return nil
+	}
+
+	p2 := p + ".en" + path.Ext(p)
+	if err := ffmpeg(ctx, "-y",
+		"-i", p,
+		"-vcodec", "libx264",
+		"-acodec", "aac",
+		p2,
+	); err != nil {
+		return err
+	}
+
+	output2, err := ffprobe(ctx, "-i", p)
+	if err != nil {
+		return err
+	}
+
+	df := func(line string) bool {
+		return !strings.Contains(line, "tream #")
+	}
+	originalStreams := slices.DeleteFunc(strings.Split(output, "\n"), df)
+	newStreams := slices.DeleteFunc(strings.Split(output2, "\n"), df)
+	if len(originalStreams) != len(newStreams) {
+		return fmt.Errorf("stream count changed from transcode")
+	}
+
+	return os.Rename(p2, p)
+}

src/cmd/asses/main.go

@@ -0,0 +1,70 @@
+package asses
+
+import (
+	"context"
+	"io/fs"
+	"log"
+	"path"
+	"path/filepath"
+	"show-rss/src/asses"
+	"show-rss/src/cron"
+)
+
+var rootDs = []string{
+	"/volume1/video/Bel/Anime",
+	"/volume1/video/QT/TV",
+}
+
+type CB func(context.Context, string) error
+
+func Main(ctx context.Context) error {
+	return cron.Cron(ctx, asses.Next, One)
+}
+
+func One(ctx context.Context) error {
+	ctx, can := context.WithDeadline(ctx, asses.Deadline())
+	defer can()
+
+	lastD := ""
+	if err := OneWith(ctx, rootDs, func(ctx context.Context, p string) error {
+		if d := path.Dir(p); d != lastD {
+			log.Printf("asses.One(%s/...)...", d)
+			lastD = d
+		}
+		if err := asses.One(ctx, p); err != nil {
+			log.Printf("asses.One(.../%s/%s)...: err: %v", path.Base(path.Dir(p)), path.Base(p), err)
+		}
+		return nil
+	}); err != nil {
+		return err
+	}
+
+	return asses.Record(ctx)
+}
+
+func OneWith(ctx context.Context, rootds []string, cb CB) error {
+	for _, rootd := range rootds {
+		if err := one(ctx, rootd, cb); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func one(ctx context.Context, rootd string, cb CB) error {
+	return filepath.WalkDir(rootd, func(p string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if d.IsDir() {
+			return nil
+		}
+
+		if path.Ext(p) != ".mkv" {
+			return nil
+		}
+
+		return cb(ctx, p)
+	})
+}

src/cmd/asses/main_test.go

@@ -0,0 +1,28 @@
+package asses_test
+
+import (
+	"context"
+	"os"
+	"path"
+	"show-rss/src/cmd/asses"
+	"show-rss/src/db"
+	"testing"
+)
+
+func TestOneWith(t *testing.T) {
+	ctx := db.Test(t, context.Background())
+
+	d := t.TempDir()
+	os.MkdirAll(path.Join(d, "a", "b", "c"), os.ModePerm)
+	os.WriteFile(path.Join(d, "a", "f.mkv"), []byte{}, os.ModePerm)
+
+	if err := asses.OneWith(ctx, []string{d}, func(_ context.Context, p string) error {
+		t.Logf("%q", p)
+		if _, err := os.Stat(p); err != nil {
+			return err
+		}
+		return nil
+	}); err != nil {
+		t.Fatal(err)
+	}
+}

src/cmd/config.go

@@ -2,17 +2,47 @@ package cmd
 
 import (
 	"context"
+	"flag"
+	"os"
 	"show-rss/src/cleanup"
 	"show-rss/src/db"
+	"show-rss/src/server"
 )
 
-func Config(ctx context.Context) (context.Context, func(), error) {
+type Flags struct {
-	ctx, err := db.Inject(ctx, "/tmp/f.db")
+	DB         string
+	Port       int
+	Entrypoint Entrypoint
+	Pos        []string
+}
+
+func NewFlags(args []string) (Flags, error) {
+	var result Flags
+
+	fs := flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
+	fs.StringVar(&result.DB, "db", "/tmp/f.db", "path to sqlite.db")
+	fs.IntVar(&result.Port, "p", 10000, "port for http")
+	fs.Var(&result.Entrypoint, "e", "entrypoint")
+	err := fs.Parse(args)
+	result.Pos = fs.Args()
+
+	return result, err
+}
+
+func Config(ctx context.Context, args []string) (context.Context, func(), Flags, error) {
+	flags, err := NewFlags(args)
 	if err != nil {
-		return ctx, nil, err
+		return ctx, nil, flags, err
 	}
 
+	ctx, err = db.Inject(ctx, flags.DB)
+	if err != nil {
+		return ctx, nil, flags, err
+	}
+
+	ctx = server.Inject(ctx, flags.Port)
+
 	return ctx, func() {
 		cleanup.Extract(ctx)()
-	}, nil
+	}, flags, nil
 }

src/cmd/fetch/main.go

@@ -1,12 +1,14 @@
-package cron
+package fetch
 
 import (
 	"bytes"
 	"context"
 	"fmt"
 	"io"
+	"log"
 	"net/http"
 	"net/url"
+	"show-rss/src/cron"
 	"show-rss/src/feeds"
 	"show-rss/src/webhooks"
 	"strings"
@@ -15,19 +17,7 @@ import (
 )
 
 func Main(ctx context.Context) error {
-	c := time.NewTicker(time.Minute)
+	return cron.Cron(ctx, feeds.Next, One)
-	defer c.Stop()
-	for {
-		if err := One(ctx); err != nil {
-			return err
-		}
-
-		select {
-		case <-ctx.Done():
-		case <-c.C:
-		}
-	}
-	return ctx.Err()
 }
 
 func One(ctx context.Context) error {
@@ -45,11 +35,13 @@ func one(ctx context.Context, feed feeds.Feed) error {
 	} else if !should {
 		return nil
 	}
+	log.Printf("fetching %s", feed.Version.URL)
 
 	items, err := feed.Fetch(ctx)
 	if err != nil {
 		return err
 	}
+	log.Printf("fetched feed %s: %d items", feed.Version.URL, len(items))
 
 	for _, item := range items {
 		if err := oneItem(ctx, feed, item); err != nil {
@@ -70,7 +62,7 @@ func oneItem(ctx context.Context, feed feeds.Feed, item feeds.Item) error {
 		Item: item,
 	}
 
-	wmethod, wurl, wbody := feed.Webhook()
+	wmethod, wurl, wbody := feed.Webhook(ctx)
 
 	method, err := render(wmethod, arg)
 	if err != nil {
@@ -97,6 +89,7 @@ func oneItem(ctx context.Context, feed feeds.Feed, item feeds.Item) error {
 	if did, err := webhooks.Did(ctx, method, wurl, body); err != nil || did {
 		return err
 	}
+	log.Printf("webhooking %s %s: %s", method, wurl, body)
 
 	req, err := http.NewRequest(method, wurl, strings.NewReader(body))
 	if err != nil {

src/cmd/fetch/main_test.go

@@ -1,4 +1,4 @@
-package cron_test
+package fetch_test
 
 import (
 	"bytes"
@@ -7,7 +7,7 @@ import (
 	"io"
 	"net/http"
 	"os"
-	"show-rss/src/cmd/cron"
+	"show-rss/src/cmd/fetch"
 	"show-rss/src/db"
 	"show-rss/src/feeds"
 	"strconv"
@@ -85,7 +85,7 @@ func TestOne(t *testing.T) {
 				ctx := aCtx(t)
 				for i := 0; i < 2; i++ {
 					t.Run(strconv.Itoa(i), func(t *testing.T) {
-						if err := cron.One(ctx); err != nil && ctx.Err() == nil {
+						if err := fetch.One(ctx); err != nil && ctx.Err() == nil {
 							t.Fatalf("failed %d: %v", i, err)
 						}
 					})
@@ -96,7 +96,7 @@ func TestOne(t *testing.T) {
 				for i := 0; i < 2; i++ {
 					t.Run(strconv.Itoa(i), func(t *testing.T) {
 						ctx := aCtx(t)
-						if err := cron.One(ctx); err != nil && ctx.Err() == nil {
+						if err := fetch.One(ctx); err != nil && ctx.Err() == nil {
 							t.Fatalf("failed %d: %v", i, err)
 						}
 					})

src/cmd/main.go

@@ -4,36 +4,118 @@ import (
 	"context"
 	"fmt"
 	"log"
-	"show-rss/src/cmd/cron"
+	inass "show-rss/src/asses"
+	"show-rss/src/cmd/asses"
+	"show-rss/src/cmd/fetch"
 	"show-rss/src/cmd/server"
 	"show-rss/src/pool"
+	"strings"
 	"time"
 )
 
-func Main(ctx context.Context) error {
+func Main(ctx context.Context, args []string) error {
 	ctx, can := context.WithCancel(ctx)
 	defer can()
 
-	ctx, can, err := Config(ctx)
+	ctx, can, flags, err := Config(ctx, args)
 	if err != nil {
 		return fmt.Errorf("failed to inject: %w", err)
 	}
 	defer can()
 
-	foos := map[string]func(context.Context) error{
+	switch flags.Entrypoint {
-		"server": server.Main,
+	case Defacto:
-		"cron":   cron.Main,
+		foos := map[string]func(context.Context) error{
-	}
+			"server": server.Main,
-	p := pool.New(len(foos))
+			"fetch":  fetch.Main,
-	defer p.Wait(ctx)
+			"asses":  asses.Main,
-
-	for k, foo := range foos {
-		if err := p.Go(ctx, k, runner(ctx, k, foo)); err != nil {
-			return fmt.Errorf("failed to go %s: %v", k, err)
 		}
-	}
+		p := pool.New(len(foos))
+		defer p.Wait(ctx)
 
-	return p.Wait(ctx)
+		for k, foo := range foos {
+			if err := p.Go(ctx, k, runner(ctx, k, foo)); err != nil {
+				return fmt.Errorf("failed to go %s: %v", k, err)
+			}
+		}
+
+		return p.Wait(ctx)
+	case DeportAss:
+		for _, pos := range flags.Pos {
+			if err := inass.Entrypoint(ctx, pos); err != nil {
+				return err
+			}
+		}
+		return nil
+	case BestAssToSRT:
+		errs := []string{}
+		for _, pos := range flags.Pos {
+			if err := inass.BestAssToSRT(ctx, pos); err != nil {
+				err = fmt.Errorf("[%s] %w", pos, err)
+				log.Println(err)
+				errs = append(errs, err.Error())
+			}
+		}
+		if len(errs) > 0 {
+			return fmt.Errorf("errors: %+v", errs)
+		}
+		return nil
+	case Transcode:
+		for _, pos := range flags.Pos {
+			log.Printf("transcoding %q...", pos)
+			if err := inass.EntrypointTranscode(ctx, pos); err != nil {
+				return err
+			}
+		}
+		return nil
+	default:
+		panic(flags.Entrypoint.String())
+	}
+	return nil
+}
+
+type Entrypoint int
+
+const (
+	Defacto Entrypoint = iota
+	DeportAss
+	BestAssToSRT
+	Transcode
+)
+
+func (e *Entrypoint) Set(s string) error {
+	switch s {
+	case Defacto.String():
+		*e = Defacto
+	case DeportAss.String():
+		*e = DeportAss
+	case BestAssToSRT.String():
+		*e = BestAssToSRT
+	case Transcode.String():
+		*e = Transcode
+	default:
+		return fmt.Errorf("%s nin (%s)", s, strings.Join([]string{
+			Defacto.String(),
+			DeportAss.String(),
+			BestAssToSRT.String(),
+			Transcode.String(),
+		}, ", "))
+	}
+	return nil
+}
+
+func (e Entrypoint) String() string {
+	switch e {
+	case Defacto:
+		return ""
+	case DeportAss:
+		return "deport-ass"
+	case BestAssToSRT:
+		return "best-ass-to-srt"
+	case Transcode:
+		return "transcode"
+	}
+	panic("cannot serialize entrypoint")
 }
 
 func runner(ctx context.Context, k string, foo func(context.Context) error) func() error {
@@ -50,6 +132,5 @@ func runner(ctx context.Context, k string, foo func(context.Context) error) func
 			case <-time.After(time.Second):
 			}
 		}
-		return err
 	}
 }

src/cmd/server/handler/feeds.go

@@ -10,17 +10,42 @@ import (
 
 func (h Handler) feeds(w http.ResponseWriter, r *http.Request) error {
 	switch r.Method {
+	case http.MethodDelete:
+		if err := r.ParseForm(); err != nil {
+			return err
+		}
+		if err := h.feedsDelete(r.Context(), r.URL.Query().Get("id")); err != nil {
+			return err
+		}
 	case http.MethodPost, http.MethodPut:
 		if err := r.ParseForm(); err != nil {
 			return err
 		}
-		return h.feedsUpsert(r.Context(), r.URL.Query().Get("id"), r.Form)
+		if r.URL.Query().Has("delete") {
+			if err := h.feedsDelete(r.Context(), r.URL.Query().Get("id")); err != nil {
+				return err
+			}
+		} else {
+			if err := h.feedsUpsert(r.Context(), r.URL.Query().Get("id"), r.Form); err != nil {
+				return err
+			}
+		}
 	default:
 		http.NotFound(w, r)
+		return nil
 	}
+
+	u2 := *r.URL
+	u2.RawQuery = ""
+	u2.Path = "/"
+	http.Redirect(w, r, u2.String(), http.StatusSeeOther)
 	return nil
 }
 
+func (h Handler) feedsDelete(ctx context.Context, id string) error {
+	return feeds.Delete(ctx, id)
+}
+
 func (h Handler) feedsUpsert(ctx context.Context, id string, form url.Values) error {
 	var req feeds.Version
 	for k, v := range map[string]*string{

src/cmd/server/handler/feeds_test.go

@@ -29,7 +29,7 @@ func TestFeeds(t *testing.T) {
 		r = r.WithContext(ctx)
 		r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 		h.ServeHTTP(w, r)
-		if w.Code != http.StatusOK {
+		if w.Code != http.StatusSeeOther {
 			t.Errorf("(%d) %s", w.Code, w.Body.Bytes())
 		}
 		found := false

src/cmd/server/handler/handler.go

@@ -28,7 +28,7 @@ func (h Handler) serveHTTP(w http.ResponseWriter, r *http.Request) error {
 		return h.vpntor(r.Context(), r.Body)
 	} else if strings.HasPrefix(r.URL.Path, "/v1/feeds") {
 		return h.feeds(w, r)
-	} else if strings.HasPrefix(r.URL.Path, "/experimental/ui") {
+	} else if strings.HasPrefix(r.URL.Path, "/experimental/ui") || r.URL.Path == "/" {
 		return h.ui(w, r)
 	} else if strings.HasPrefix(r.URL.Path, "/experimental/echo") {
 		b, _ := io.ReadAll(r.Body)

src/cmd/server/handler/public/index.tmpl

@@ -23,7 +23,13 @@
         {{ if eq "" .editing.ID }}
           New
         {{ else }}
-          Update <code><a target="_blank" href="{{ .editing_url }}">{{ .editing.URL }}</a></code> (<a href="?">clear</a>)
+          Updating <code><a target="_blank" href="{{ .editing_url }}">{{ .editing.URL }}</a></code> (<a href="?">clear</a>)
+          <br>
+          <div style="scale: 0.85">
+            <form method="POST" action="/v1/feeds?id={{ .editing.ID }}&delete">
+              <button type="submit">DELETE</button>
+            </form>
+          </div>
         {{ end }}
       </h3>
       <form method="POST" action="/v1/feeds?id={{ .editing.ID }}">
@@ -32,9 +38,9 @@
             <div>
               <label for="{{ $k }}">
                 {{ $k }}
-                {{- if eq $k "URL" }} 
+                {{- if eq $k "URL" }}
                   (hint: nyaa://?q=show)
-                {{ else if eq $k "WebhookURL" }} 
+                {{ else if eq $k "WebhookURL" }}
                   (hint: vpntor:///outdir)
                 {{ end }}
               </label>

src/cmd/server/handler/ui.go

@@ -2,28 +2,43 @@ package handler
 
 import (
 	"encoding/json"
+	"fmt"
+	"math/rand"
 	"net/http"
 	"os"
 	"path"
 	"show-rss/src/feeds"
 	"slices"
+	"strings"
 	"text/template"
 	"time"
+
+	"embed"
+	_ "embed"
 )
 
+//go:embed public/index.tmpl
+var embeddedIndexTMPL string
+
+//go:embed public/*
+var embeddedDir embed.FS
+
 var dir = func() string {
 	if v := os.Getenv("UI_D"); v != "" {
 		return v
 	}
-	return "./src/cmd/server/handler/testdata"
+	return "./src/cmd/server/handler/public"
 }()
 
 func (h Handler) ui(w http.ResponseWriter, r *http.Request) error {
-	fs := http.FileServer(http.Dir(dir))
+	if path.Base(r.URL.Path) == "ui" || r.URL.Path == "/" {
-	if path.Base(r.URL.Path) == "ui" {
 		return h.uiIndex(w, r)
 	}
-	http.StripPrefix("/experimental/ui", fs).ServeHTTP(w, r)
+
+	w.Header().Set("Cache-Control", "max-age=2592000")
+	fs := http.FileServer(http.FS(embeddedDir))
+	r.URL.Path = fmt.Sprintf("/public/%s", strings.TrimPrefix(r.URL.Path, "/experimental/ui"))
+	fs.ServeHTTP(w, r)
 	return nil
 }
 
@@ -34,9 +49,17 @@ func (h Handler) uiIndex(w http.ResponseWriter, r *http.Request) error {
 		feeds.Entry   `json:",inline"`
 		feeds.Version `json:",inline"`
 	}
+	editing.Version.Cron = fmt.Sprintf("%d */12 * * *", rand.Int()%60)
+	editing.Version.URL = "nyaa://?q=SOME_SHOW dual web-dl"
+	editing.Version.Pattern = ".*"
+	editing.Version.WebhookBody = "{{ .Item.Link }}"
+	editing.Version.WebhookMethod = "POST"
+	editing.Version.WebhookURL = "vpntor:///data/completed-rss/TITLE"
 	all := []feeds.Feed{}
 	if err := feeds.ForEach(ctx, func(f feeds.Feed) error {
-		all = append(all, f)
+		if deleted := f.Version.URL == ""; !deleted {
+			all = append(all, f)
+		}
 		if f.Entry.ID == r.URL.Query().Get("edit") {
 			editing.Entry = f.Entry
 			editing.Version = f.Version
@@ -47,6 +70,9 @@ func (h Handler) uiIndex(w http.ResponseWriter, r *http.Request) error {
 	}
 
 	b, _ := os.ReadFile(path.Join(dir, "index.tmpl"))
+	if len(b) == 0 {
+		b = []byte(embeddedIndexTMPL)
+	}
 
 	tmpl := template.New(r.URL.Path).Funcs(template.FuncMap{
 		"feeds": func() []feeds.Feed {

src/cmd/server/main.go

@@ -10,7 +10,7 @@ import (
 )
 
 func Main(ctx context.Context) error {
-	return Run(ctx, fmt.Sprintf(":%d", server.Port))
+	return Run(ctx, fmt.Sprintf(":%d", server.Extract(ctx)))
 }
 
 func Run(ctx context.Context, listen string) error {

src/cron/cron.go

@@ -0,0 +1,31 @@
+package cron
+
+import (
+	"context"
+	"time"
+)
+
+func Cron(ctx context.Context, next func(context.Context) (time.Time, error), do func(ctx context.Context) error) error {
+	n, err := next(ctx)
+	if err != nil {
+		return err
+	}
+
+	c := time.NewTicker(3 * time.Minute)
+	defer c.Stop()
+	for {
+		select {
+		case <-ctx.Done():
+		case <-c.C:
+			n, err = next(ctx)
+			if err != nil {
+				return err
+			}
+		case <-time.After(time.Until(n)):
+			if err := do(ctx); err != nil {
+				return err
+			}
+		}
+	}
+	return ctx.Err()
+}

src/db/ctx.go

@@ -25,7 +25,7 @@ func Test(t *testing.T, ctx context.Context) context.Context {
 		t.Fatalf("failed to inject db %s: %v", p, err)
 	}
 	t.Cleanup(func() {
-		db, err := extract(ctx)
+		db, _, err := extract(ctx)
 		if err != nil {
 			return
 		}
@@ -35,7 +35,7 @@ func Test(t *testing.T, ctx context.Context) context.Context {
 }
 
 func Inject(ctx context.Context, conn string) (context.Context, error) {
-	if _, err := extract(ctx); err == nil {
+	if _, _, err := extract(ctx); err == nil {
 		return ctx, nil
 	}
 
@@ -69,13 +69,13 @@ func Inject(ctx context.Context, conn string) (context.Context, error) {
 		return ctx, err
 	}
 
-	return context.WithValue(ctx, ctxKey, db), ctx.Err()
+	return context.WithValue(context.WithValue(ctx, ctxKey+"_lock", newSemaphore()), ctxKey, db), ctx.Err()
 }
 
-func extract(ctx context.Context) (*sql.DB, error) {
+func extract(ctx context.Context) (*sql.DB, semaphore, error) {
 	db := ctx.Value(ctxKey)
 	if db == nil {
-		return nil, fmt.Errorf("db not injected")
+		return nil, nil, fmt.Errorf("db not injected")
 	}
-	return db.(*sql.DB), nil
+	return db.(*sql.DB), ctx.Value(ctxKey + "_lock").(semaphore), nil
 }

src/db/db.go

@@ -129,9 +129,11 @@ func Exec(ctx context.Context, q string, args ...any) error {
 }
 
 func with(ctx context.Context, foo func(*sql.DB) error) error {
-	db, err := extract(ctx)
+	db, sem, err := extract(ctx)
 	if err != nil {
 		return err
 	}
-	return foo(db)
+	return sem.With(ctx, func() error {
+		return foo(db)
+	})
 }

src/db/sem.go

@@ -0,0 +1,21 @@
+package db
+
+import "context"
+
+type semaphore chan struct{}
+
+func newSemaphore() semaphore {
+	return make(semaphore, 1)
+}
+
+func (semaphore semaphore) With(ctx context.Context, cb func() error) error {
+	select {
+	case semaphore <- struct{}{}:
+	case <-ctx.Done():
+		return ctx.Err()
+	}
+	defer func() {
+		<-semaphore
+	}()
+	return cb()
+}

src/feeds/db.go

@@ -3,7 +3,6 @@ package feeds
 import (
 	"context"
 	"fmt"
-	"io"
 	"net/url"
 	"show-rss/src/db"
 	"show-rss/src/server"
@@ -42,6 +41,24 @@ type (
 	}
 )
 
+func Next(ctx context.Context) (time.Time, error) {
+	result := time.Now().Add(3 * time.Minute)
+	err := ForEach(ctx, func(f Feed) error {
+		next, err := f.Next()
+		if err != nil {
+			return nil
+		}
+
+		if next.After(result) {
+			return nil
+		}
+
+		result = next
+		return nil
+	})
+	return result, err
+}
+
 func ForEach(ctx context.Context, cb func(Feed) error) error {
 	if err := initDB(ctx); err != nil {
 		return err
@@ -55,18 +72,27 @@ func ForEach(ctx context.Context, cb func(Feed) error) error {
 		return err
 	}
 
+	var errs []string
 	for _, id := range ids {
 		feed, err := Get(ctx, id.ID)
 		if err != nil {
 			return err
 		} else if err := cb(feed); err != nil {
-			return err
+			errs = append(errs, fmt.Sprintf(`failed to fetch %s: %v`, id.ID, err))
 		}
 	}
 
+	if len(errs) > 0 {
+		return fmt.Errorf("failed some callbacks: %+v", errs)
+	}
+
 	return nil
 }
 
+func Delete(ctx context.Context, id string) error {
+	return Update(ctx, id, "", "", "", "", "", "")
+}
+
 func Get(ctx context.Context, id string) (Feed, error) {
 	if err := initDB(ctx); err != nil {
 		return Feed{}, err
@@ -206,14 +232,6 @@ func Update(ctx context.Context, id string, url, cron, pattern, webhookMethod, w
 	)
 }
 
-func (feed Feed) Update(ctx context.Context, url, cron, pattern, tag *string) error {
-	return io.EOF
-}
-
-func (feed Feed) Delete(ctx context.Context) error {
-	return io.EOF
-}
-
 func getEntry(ctx context.Context, id string) (Entry, error) {
 	if err := initDB(ctx); err != nil {
 		return Entry{}, err
@@ -263,11 +281,11 @@ func initDB(ctx context.Context) error {
 	})
 }
 
-func (feed Feed) Webhook() (string, string, string) {
+func (feed Feed) Webhook(ctx context.Context) (string, string, string) {
 	u, _ := url.Parse(feed.Version.WebhookURL)
 	switch u.Scheme {
 	case "vpntor":
-		return "POST", fmt.Sprintf("http://localhost:%d/v1/vpntor", server.Port), fmt.Sprintf(`{
+		return "POST", fmt.Sprintf("http://localhost:%d/v1/vpntor", server.Extract(ctx)), fmt.Sprintf(`{
 			"Magnet": "{{ .Item.Link }}",
 			"Dir": %q,
 			"URL": "https://vpntor.int.bel.blue/transmission/rpc"

src/feeds/http.go

@@ -28,10 +28,14 @@ var (
 )
 
 func (feed Feed) ShouldExecute() (bool, error) {
-	if !feed.Entry.Deleted.IsZero() {
+	if !feed.Entry.Deleted.IsZero() || feed.Version.URL == "" {
 		return false, nil
 	}
+	next, err := feed.Next()
+	return time.Now().After(next), err
+}
 
+func (feed Feed) Next() (time.Time, error) {
 	schedule, err := cron.NewParser(
 		cron.SecondOptional |
 			cron.Minute |
@@ -42,10 +46,9 @@ func (feed Feed) ShouldExecute() (bool, error) {
 			cron.Descriptor,
 	).Parse(feed.Version.Cron)
 	if err != nil {
-		return false, fmt.Errorf("illegal cron %q", feed.Version.Cron)
+		return time.Time{}, fmt.Errorf("illegal cron %q", feed.Version.Cron)
 	}
-	next := schedule.Next(feed.Execution.Executed)
+	return schedule.Next(feed.Execution.Executed), nil
-	return time.Now().After(next), nil
 }
 
 func (feed Feed) Fetch(ctx context.Context) (Items, error) {

src/server/config.go

@@ -1,14 +1,18 @@
 package server
 
 import (
-	"os"
+	"context"
-	"strconv"
 )
 
-var Port = func() int {
+func Inject(ctx context.Context, port int) context.Context {
-	port, _ := strconv.Atoi(os.Getenv("PORT"))
+	return context.WithValue(ctx, "server.port", port)
-	if port == 0 {
+}
-		port = 10000
+
+func Extract(ctx context.Context) int {
+	v := ctx.Value("server.port")
+	port, ok := v.(int)
+	if !ok {
+		return 10_000
 	}
 	return port
-}()
+}

src/slow/reader.go

@@ -0,0 +1,45 @@
+package slow
+
+import (
+	"context"
+	"io"
+
+	"golang.org/x/time/rate"
+)
+
+type Reader struct {
+	ctx     context.Context
+	limiter rate.Limiter
+	r       io.Reader
+}
+
+var _ io.Reader = &Reader{}
+
+func NewReader(ctx context.Context, bps rate.Limit, r io.Reader) *Reader {
+	return &Reader{
+		ctx:     ctx,
+		limiter: *rate.NewLimiter(bps, int(bps)),
+		r:       r,
+	}
+}
+
+func (r *Reader) Read(b []byte) (int, error) {
+	n, err := r.r.Read(b)
+
+	m := 0
+	burst := r.limiter.Burst()
+	for m < n {
+		page := burst
+		if left := n - m; page > left {
+			page = left
+		}
+
+		if err := r.limiter.WaitN(r.ctx, page); err != nil {
+			return n, err
+		}
+
+		m += page
+	}
+
+	return n, err
+}

src/slow/reader_test.go

@@ -0,0 +1,20 @@
+package slow_test
+
+import "show-rss/src/slow"
+import "testing"
+import "context"
+import "bytes"
+import "io"
+
+func TestReader(t *testing.T) {
+   junk := bytes.NewReader(bytes.Repeat([]byte("1"), 256_000))
+
+   slowReader := slow.NewReader(context.Background(), 300_000, junk)
+
+   buff := bytes.NewBuffer(nil)
+   if n, err := io.Copy(buff, slowReader); err != nil {
+      t.Fatal(err)
+   } else if n != 256_000 {
+      t.Fatal(n)
+   }
+}