Batch H1 step 3b — THE data fix. Conflict resolution was the one live
erasure writer: applyProgressResolution and its verbatim twin
applyResolution both wrote the winner via a raw UpdateUniversalProgress
whose param list omits audio_offset_seconds/context_text/viewports, and
the SQL's DO UPDATE SET ... = EXCLUDED... NULLed exactly those. The web
UI resolves through POST /api/conflicts/:id/resolve and
/api/conflicts/bulk-resolve (main.js resolveConflict/bulkResolve), and
the reader's mark-as-read fires a resolution first when the reader SSR
stamps data-conflict-id/-winner — so every resolution today erased the
audiobook position and reader context.
Now: ProgressService is a required ConflictHandler dependency; BOTH
call sites (single resolve + bulk resolve) share one
applyProgressResolution that funnels through SaveProgress (the verbatim
twin is deleted). Deliberate choices, per the plan:
- SkipConflictDetection on the resolution write: both flows apply
BEFORE the conflict row is marked resolved, so the funnel's LWW
detector would otherwise file a duplicate pending conflict
(HasRecentConflictResolution is false at apply time).
- Source "conflict_resolution" — the row's last-write attribution; the
winner stays durably recorded in resolution_data.winner.
- Broadcast: true — live devices jump to the winning position.
- The winner snapshot maps percentage/epubcfi/context_text/chapter/
character/page/total_pages; a winner without a CFI clears the locator
pair (ClearLocator) instead of re-pairing with the loser's stale
anchor. Everything the snapshot doesn't carry SURVIVES via the LWW
seed: audio_offset_seconds above all. chapter_progress keeps its
stored value (was overwritten with the book percentage), an absent
percentage survives (was written as 0%).
- Accepted: the resolution captures one reading_history session
(attributed to conflict_resolution; the 2h idle ceiling applies).
Verification: TestH1_ConflictResolutionPreservesAudio drives the real
flow — web push with audio 300s, diverging push from a second source
detects a conflict, resolve with the second source as winner, GET shows
percentage 0.3 AND audio_offset_seconds 300 (previously NULLed), and no
duplicate pending conflict remains. Full contract pin suite green.
The host-run TestConflict*/TestProgress* failures are environmental
(container-only /app/uploads path + db hostname; fail identically at
baseline b4ae423) — the same suites pass in the test-runner container.
Batch H1 steps 1-2 of the hardening plan. Wire contracts frozen; the
pinned shapes are unchanged modulo the whitelisted additive GET keys
(docs/contract_pins.md).
1. One canonical request struct. The web PUT binds SaveProgressRequest
directly (identity/attribution fields are json:"-" so they stay
server-owned) and copies its server fields once — the hand-rolled DTO
and the 20-line field-copy block are gone. Parse set for existing
clients is IDENTICAL to the old DTO (verified in web/src: the ebook
reader sends percentage/current_page/total_pages/reading_mode/epubcfi/
context_text/chapter/zoom_level — reader.ts:3113-3143; the audiobook
reader sends percentage/chapter/audio_offset_seconds/elapsed_seconds/
reading_mode — audio.ts:518-520).
2. GET /api/media-items/:id/progress now serializes through one
row-struct-driven builder instead of a hand-map, so a row column
cannot be silently forgotten again (the audio_offset_seconds
omission). Existing keys are verbatim; the row already carried
audio_offset_seconds/reading_mode/viewport_x-y/zoom_level/
scroll_position_x-y/panel_number and they surface as WHITELISTED
additive keys. The web audiobook reader already reads
audio_offset_seconds (audio.ts:219) — with the key absent,
durationless books resumed at chapter start (offset always 0); they
now resume correctly. The conditional context_text bolt-on and the
server-derived css_selector/anchor_href block are unchanged —
restore precedence stays percentage-first, never re-derived.
Phase 1 (foundation): 'audiobooks' library type seeded (schema + DB);
audio_metadata JSONB on media_items (the kobo_metadata precedent —
only audio paths read it); reading_progress.audio_offset_seconds for
the honest {chapter, offset} locator; extensions/mimes registered for
ALL breadth formats (m4b/m4a/mp3/flac — deliberate per the DOC/LIT
doctrine, m4b scans richly first); classifyFormatGroup 'audiobook'
case (gotcha 39 recomputes on rescan); Go mime table extended at boot
so media elements accept the streams; ffmpeg/ffprobe in the image
(8.1.2 — also the xHE-AAC identification tripwire).
Phase 2 (ingest): sidecar-first (Libation/ABS metadata.json —
narrators/ASIN/curated chapters), ffprobe fallback/filler (duration,
bitrate, codec/profile, embedded chapters). Fixed three real
parser brittlenesses the Libation sidecar exposed: series accepts
string OR array-of-objects, publishedYear accepts number OR string,
ffprobe chapter timings accept number OR string (flexFloat). Folder-
structure fallback now runs on the UPDATE path too (rescans were
clearing sidecar-absent series/author); audio facts re-derive on
every rescan (gotcha 39).
Phase 3 (playback + sync): GET /api/media-items/:id/chapters (the
format-abstraction list); streaming rides the existing cookie-authed
Range /uploads path; PUT progress carries audio_offset_seconds +
elapsed_seconds (honest wall-clock playing time) — the reading-
history capture prefers player-reported elapsed over the inter-push
delta, same 2h ceiling; reading_mode='audio' marks the row.
Phase 4 (web player): dedicated audio reader page (foliate not
involved) — cover, chapter title, whole-book scrubber, skip ± (chips
1/5/10/15/30s, default 10s), speed (0.75×–2×), chapter list with
jump-to, Media Session lockscreen/notification transport, periodic
playing-only progress pushes, position restore on open.
Verified live: ingest of the Libation sample (Gardens of the Moon —
title/author/series/cover/date from sidecar+folders, 34 chapters,
26h duration, aac/LC); chapters endpoint; the reader route serving
the player; playback with position restore (0:57 round-trip);
progress rows in audio mode; wall-clock session rows in
reading_history.
The design parked in the handoff (multi-tier stats off reading_history;
bookorbit-style in data, not looks) is in. The real prerequisite work
was data: reading_history existed but NOTHING wrote to it — the whole
stats feature was sitting on an empty table.
- CAPTURE (no client changes, no repo-boundary crossings): every
successful progress write through SaveProgress (KOReader + app + web
+ Kobo + offline queue — the one chokepoint) now records one
reading_history session row: span = the interval since the PREVIOUS
write instant, pages = positive page delta when both sides know the
page index, marker rows for first contact. Spans over 2h are kept as
zero-second markers (overnight suspend→resume, offline flushes must
not inflate totals) — the honest 'sync cadence, not a stopwatch'
caveat stays. device_id only when a REAL device row matches (the
web/app progress path historically stuffs the USER id into DeviceID
— probe instead of trusting it; FK violation would silently drop
every capture). Source preserved in device_metadata.
- API: /api/stats/summary?range=7|30|90|year (totals, zero-filled
daily arrays, streaks, most-active day/weekday, top books, library
breakdown — one call), /api/stats/this-week (widget: rolling 7d vs
previous + streak), /api/stats/books/:id (lifetime + recent
sessions). All bucketed in the user's timezone; finished ≡ any push
≥0.995; visible-library lens enforced at source. Legacy
/api/analytics/* kept untouched. Range windows anchor end-of-day to
the START of today (blasting the clock time into tomorrow resolved
'today' a calendar day late — found by the streak test).
- /stats page (sidebar Stats between Progress and Devices, previously
/analytics was an orphan): range selector, five stat cards, two
Chart.js v4 charts (daily minutes bar, pages/day line — chunked via
dynamic import so main.js stays untouched), per-library breakdown,
most-read list, empty-state explainer. /analytics now 301s to /stats.
The orphaned analytics.templ + analytics.ts removed (their containers
and the page JSON never matched; the page was astub).
- Dashboard 'This Week' widget (server-rendered, suppressed on service
failure) and the book detail 'Your Reading Stats' card (lifetime
totals of the viewer's own sessions) complete the tiers: per-user
default, per-library breakdown inline, per-book on the page,
per-system/admin aggregate parked as before.
Tests: statistics_test.go (capture semantics at the chokepoint,
tz/day buckets, zero-fill, streak math, finished detection, range
validation, auth gate, widget, per-book lifetime). Full suite PASS.
The verify/heal pipeline verified only INBOUND context-bearing writes;
stored-row coherence was never enforced. SaveProgress seeds missing
fields from the existing row, so every percentage-only write (KOReader
low-confidence conversion, KOReader no-pointer payloads, Kobo markup
ReadingSync / analytics / sync-from-server, locator-less queue entries)
silently re-paired its NEW percentage with the PREVIOUS writer's stale
CFI+context — the incoherent row shape that fed the client-side
far-anchor restore floor (and, via the read-side anchor handles, could
even hand a first-party client the OLD position's scroll address).
KOReader's converter already declared the right intent ("storing
percentage only — the row's percentage restores approximately"); the
seeding betrayed it. SaveProgressRequest gains ClearLocator, set by the
percentage-only call sites, and the seeding rule honors it: stale
epubcfi/context/character_offset clear (the upsert assigns columns
directly, so NULL sticks) unless the request carries its own. A
request-carried context survives so the verify/heal pass can still mint
a fresh anchor from it; the HTTP merge path (field-absent PUTs
preserve) and all anchor-bearing writes are untouched. The fixed-layout
branch already cleared locators unconditionally — unchanged.
Consumer audit: percentage — the only thing every sync round-trip
exchanges — is untouched on all paths; KOReader pulls on locator-less
rows already support the nil-CFI shape (builder guards
progress.Epubcfi.Valid); first-party restores go percentage-first
instead of floor-fighting a stale anchor.
Tests: TestProgressWeb_LocatorCoherence pins clear-on-declared,
request-carried-context survival, and merge-path preservation. Full
suite with the change: 218 groups, zero failures.
Offset currency policy, now explicit: EPUB CFI terminals, CRE text()
offsets and the served char_offset handle are UTF-16 code units (the
EPUB CFI spec, and what foliate/readium/KOReader/Kobo clients actually
observe), while internal arithmetic — the book-wide character_offset
column and percentage fractions — stays rune-based, consistent with
TotalCharacters. For all-BMP books the currencies are identical, so no
stored value changes; astral-plane text (emoji, rare CJK) no longer
drifts.
Boundaries converted: resolveCFIToNode interprets incoming CFI terminal
offsets as UTF-16; textNodeAtUTF16Offset (née textNodeAtRuneOffset)
interprets CRE text() offsets as UTF-16; buildCFI and buildCREXPointer
emit UTF-16 terminals; blockCharOffset (the served char_offset) is
UTF-16.
Also fixes two character_offset column defects: heals wrote a BLOCK-
relative offset into the book-wide column, and verified-but-unhealed
saves (e.g. KOReader pushes) never refreshed it, leaving it stale
behind the anchor. VerifyProgressAnchor now returns the verified book-
wide rune offset and SaveProgress refreshes the column on every
verified save.
Tests: astral currency round trip (offset after an emoji must shift by
one unit between currencies, in both heal and exact-verify directions)
and book-offset ordering. The cmd/server/tests integration harness
failures under docker (library folder 400 during setup) reproduce on
the pre-change tree and are unrelated.
Progress submissions now carry (percentage, context_text, epubcfi) and
the server becomes the position authority:
- VerifyProgressAnchor resolves the submitted standard CFI against the
book's own XHTML, extracts the text at the anchor, and cross-checks it
with the submitted context_text. A mismatch heals the anchor by text
search (percentage disambiguates repeats) instead of storing a bad
position.
- The anchor's block element is derived as a cssSelector plus a block-
relative character offset, and served on progress GET alongside the
anchor document's href — readium-native handles that let clients
re-open a book without parsing CFIs themselves.
- context_text-only submissions (no CFI — the dumb-client tier) are
anchored structurally from the context text.
Motivation: cross-client progress sync (web foliate CFIs, KOReader CRE
xpointers, readium-native apps) previously trusted each client's own
locator math; the app's EPUB restore drifted ±pages because readium's
paginator does not lay out far-from-viewport columns and the foliate-
ported CFI walk ran against readium's mutated WebView DOM. Server-side
verification heals both classes at ingest.
The push path (koreader→server) was already updated to omit epubcfi
for paging documents, and SaveProgress derives percentage from
page/total_pages for fixed formats. However, the pull path
(server→koreader) still returned any stored epubcfi and attempted
CFI→XPointer conversion, and SaveProgress preserved stale CFI values
written by the web reader (which generates fake CFIs via
CFI.fake.fromIndex for every comic/PDF page).
These fake CFI strings lingered in the database and koreader's pull
path picked them up over progress.page, causing tonumber("epubcfi(...)")
→ nil → GotoPage(nil) → crash when the user confirmed the sync prompt.
Changes:
- GetMetadata (koreader.go): for fixed_layout/comic_archive formats,
skip returning epubcfi and skip the CFI→CRE XPointer conversion.
Reflowable documents are byte-for-byte unchanged.
- SaveProgress (progress.go): for fixed formats, explicitly clear
epubcfi and character_offset on every save so stale values from
prior web-reader sessions are cleaned up over time.
Fixed-layout EPUBs, PDFs, DjVu, and comic archives (cbz/cbr/cb7/cbt)
are page-based: each page is a fixed image, so a page index is an exact,
universal locator regardless of screen size or device. Sync previously
treated these like reflowable content (CFI-first restore, percentage
fallback, character-offset math), which was both wrong and lossy. This
makes the page index the canonical position for fixed-layout and comic
formats while leaving the reflowable path byte-for-byte unchanged.
Backend:
- progress.go SaveProgress: branch on mediaItem.FormatGroup. For
fixed_layout/comic_archive derive percentage from current_page/
total_pages and skip the CFI/character-offset back-fills (meaningless
for image content). The reflowable derivation block is preserved
verbatim under an else.
- kobo.go: Kobo only sends a percentage, so for fixed-layout/comic
formats derive CurrentPage via PercentageToPage(percentage, pageCount)
using the media item's known page count, so Kobo->web lands on the
exact page.
Reader:
- reader.templ readerInitExpr: pass savedPage/savedTotalPages to the
reader config for fixed_layout/comic_archive formats.
- reader.ts: when isFixedLayout and savedPage is present, restore via
view.init({ lastLocation: savedPage - 1 }) (a bare number navigates
foliate directly to the section index). Reflowable falls through to
the existing CFI->percentage path, unchanged.
- SaveProgressRequest: add ContextText field
- SaveProgress: carry existing ContextText from DB, overwrite when provided
- ProgressUpdate: add ContextText field for checkpoint sync
- SyncQueueProcessor: serialize/deserialize context_text in sync data
- buildProgressSnapshot: include context_text in snapshot data
Introduces a centralized ProgressService that handles all reading progress
writes across web, KOReader, and Kobo clients. The service implements:
- Merge strategy: reads existing progress first, then only overwrites
non-nil fields from the incoming request. This fixes the data loss bug
where partial updates (e.g., Kobo last-read-place sending only epubcfi
and chapter) would NULL out percentage, character_offset, etc.
- Enrichment: computes missing fields from available data:
- character_offset from percentage + total_characters
- current_page from percentage + total_pages
- percentage from current_page + total_pages (reverse)
- percentage from character_offset + total_characters (reverse)
- Conflict detection: when a different source writes progress within 5
minutes with >1% difference, records a sync_conflicts row and broadcasts
a WebSocket notification for real-time UI alerts.
- Broadcast control: SaveProgressRequest.Broadcast flag lets Kobo
last-read-place and SyncFromServer skip WebSocket broadcasts.
- Pointer fields on SaveProgressRequest: nil means preserve existing,
non-nil means overwrite. Eliminates ambiguity between zero values
and not-provided fields.
Also adds unit tests for buildProgressSnapshot helper function.
Reflowable ebooks (EPUBs) don't have inherent page numbers since layout
depends on device settings. Add an EstimatedPages() function that converts
total character count to an estimated print page count using the industry
standard of 1800 characters per page.
This provides a consistent, device-independent page count for progress
display (e.g., "Page 89 of 196" for a reflowable EPUB), matching how
KOReader and similar readers handle the same problem.
Fix incorrect struct tags for Page, TotalPages, and PageY fields.
Previously used 'int' tag instead of proper JSON field names,
which would cause serialization issues.
- Add internal/sync package with format detection
- FormatGroup types: reflowable, fixed_layout, comic_archive
- DetectFormatGroup() function based on mimetype and file extension
- MimeType mappings for common ebook formats
- Progress conversion engine with:
- ConvertProgress() between format groups
- Extract percentage from various progress formats
- PageToPercentage / PercentageToPage helpers
- CharacterToPercentage / PercentageToCharacter helpers
- MergeProgress() with 'max progress wins' strategy
- FormatProgressForDisplay() for UI rendering
- Add sqlc queries for format detection and progress updates
- BulkUpdateFormatGroups query for auto-format detection
- GetUniversalProgress query with all location references
- UpdateUniversalProgress query with device sync metadata
- ReadingHistory queries for session tracking
John O'Keefe
john-okeefe