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refactor(comments): extract comment-cache subsystem (7/10)
File-size decomposition (no behavior change). Move the localStorage comment-cache methods (getCommentCacheKey, handleCommentCacheError, getCachedComments, cacheComments, removeCommentCache, clearCommentCache, persistCommentCache, serializeCommentsForCache) into js/services/commentThreadCache.js as functions that take the service instance; the service keeps thin delegators so all call sites are unchanged. Cache constants moved with them; FIVE_MINUTES_MS import dropped from the service. commentThreadService.js: 1296 -> 1100 lines (below its original 1122 baseline; re-recorded to 1100). Build + full unit suite green. Co-Authored-By: Claude Opus 4.8 <[email protected]>
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@@ -4,16 +4,23 @@ import logger, { devLogger, userLogger } from "../utils/logger.js";
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import { normalizeHexId, normalizeHexPubkey } from "../utils/hex.js";
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import { buildVideoAddressPointer } from "../utils/videoPointer.js";
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import { COMMENT_EVENT_KIND } from "../nostr/commentEvents.js";
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import { FEATURE_IMPROVED_COMMENT_FETCHING, FIVE_MINUTES_MS } from "../constants.js";
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import { FEATURE_IMPROVED_COMMENT_FETCHING } from "../constants.js";
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import {
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getCommentCacheKey as cacheGetCommentCacheKey,
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handleCommentCacheError as cacheHandleCommentCacheError,
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getCachedComments as cacheGetCachedComments,
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cacheComments as cacheCacheComments,
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removeCommentCache as cacheRemoveCommentCache,
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clearCommentCache as cacheClearCommentCache,
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persistCommentCache as cachePersistCommentCache,
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serializeCommentsForCache as cacheSerializeCommentsForCache,
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} from "./commentThreadCache.js";
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const ROOT_PARENT_KEY = "__root__";
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const DEFAULT_INITIAL_LIMIT = 40;
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const DEFAULT_HYDRATION_DEBOUNCE_MS = 25;
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const PROFILE_FETCH_MAX_ATTEMPTS = 3;
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const PROFILE_FETCH_BACKOFF_MS = 50;
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const COMMENT_CACHE_PREFIX = "bitvid:comments:";
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const COMMENT_CACHE_TTL_MS = FIVE_MINUTES_MS;
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const COMMENT_CACHE_VERSION = 2;
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function toPositiveInteger(value, fallback) {
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const numeric = Number(value);
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@@ -400,237 +407,35 @@ export default class CommentThreadService {
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}
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getCommentCacheKey(videoEventId) {
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const normalized = normalizeHexId(videoEventId);
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if (!normalized) {
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return "";
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}
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return `${COMMENT_CACHE_PREFIX}${normalized.toLowerCase()}`;
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return cacheGetCommentCacheKey(videoEventId);
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}
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handleCommentCacheError(context, videoEventId, error) {
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this.commentCacheDiagnostics = {
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...this.commentCacheDiagnostics,
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storageUnavailable: true,
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};
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const message =
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typeof videoEventId === "string" && videoEventId.trim()
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? `[commentThread] Failed to ${context} comment cache for ${videoEventId}.`
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: `[commentThread] Failed to ${context} comment cache.`;
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if (this.logger?.user?.warn) {
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this.logger.user.warn(message, error);
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} else if (this.logger?.warn) {
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this.logger.warn(message, error);
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}
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if (this.logger?.dev?.warn && this.logger.dev !== this.logger.user) {
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this.logger.dev.warn(message, error);
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}
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return cacheHandleCommentCacheError(this, context, videoEventId, error);
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}
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getCachedComments(videoEventId) {
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if (
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!FEATURE_IMPROVED_COMMENT_FETCHING ||
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typeof localStorage === "undefined"
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) {
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return null;
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}
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const cacheKey = this.getCommentCacheKey(videoEventId);
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if (!cacheKey) {
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logDev(
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this.logger?.dev,
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"[commentThread] Comment cache skipped: invalid video id.",
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);
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return null;
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}
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let raw = null;
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try {
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raw = localStorage.getItem(cacheKey);
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} catch (error) {
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this.handleCommentCacheError("read", videoEventId, error);
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return null;
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}
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if (raw === null) {
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logDev(
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this.logger?.dev,
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`[commentThread] Comment cache miss for ${videoEventId}: no entry present.`,
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);
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return null;
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}
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try {
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const parsed = JSON.parse(raw);
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if (!parsed || typeof parsed !== "object") {
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logDev(
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this.logger?.dev,
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`[commentThread] Comment cache rejected for ${videoEventId}: malformed payload.`,
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);
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this.removeCommentCache(cacheKey);
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return null;
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}
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const cacheVersion = Number.isFinite(parsed.version)
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? Number(parsed.version)
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: null;
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if (cacheVersion !== COMMENT_CACHE_VERSION) {
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logDev(
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this.logger?.dev,
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`[commentThread] Comment cache rejected for ${videoEventId}: version ${cacheVersion} != ${COMMENT_CACHE_VERSION}.`,
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);
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this.removeCommentCache(cacheKey);
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return null;
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}
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const comments = Array.isArray(parsed.comments)
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? parsed.comments
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: null;
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const timestamp = Number(parsed.timestamp);
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if (
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Array.isArray(comments) &&
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Number.isFinite(timestamp) &&
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Date.now() - timestamp <= COMMENT_CACHE_TTL_MS
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) {
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logDev(
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this.logger?.dev,
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`[commentThread] Loaded ${comments.length} cached comments for ${videoEventId}.`,
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);
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return comments;
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}
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logDev(
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this.logger?.dev,
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`[commentThread] Comment cache rejected for ${videoEventId}: entry expired.`,
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);
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this.removeCommentCache(cacheKey);
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} catch (error) {
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if (this.logger?.warn) {
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this.logger.warn(
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`[commentThread] Failed to parse cached comments for ${videoEventId}:`,
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error,
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);
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}
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logDev(
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this.logger?.dev,
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`[commentThread] Comment cache rejected for ${videoEventId}: parse error.`,
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);
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this.removeCommentCache(cacheKey);
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}
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return null;
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return cacheGetCachedComments(this, videoEventId);
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}
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cacheComments(videoEventId, comments) {
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if (
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!FEATURE_IMPROVED_COMMENT_FETCHING ||
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typeof localStorage === "undefined" ||
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!Array.isArray(comments)
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) {
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return;
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}
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const cacheKey = this.getCommentCacheKey(videoEventId);
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if (!cacheKey) {
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return;
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}
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try {
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localStorage.setItem(
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cacheKey,
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JSON.stringify({
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version: COMMENT_CACHE_VERSION,
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comments,
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timestamp: Date.now(),
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}),
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);
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logDev(
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this.logger?.dev,
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`[commentThread] Cached ${comments.length} comments for ${videoEventId}.`,
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);
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} catch (error) {
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this.handleCommentCacheError("write", videoEventId, error);
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}
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return cacheCacheComments(this, videoEventId, comments);
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}
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removeCommentCache(cacheKey) {
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if (!cacheKey || typeof localStorage === "undefined") {
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return;
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}
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try {
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localStorage.removeItem(cacheKey);
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} catch (error) {
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if (this.logger?.warn) {
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this.logger.warn(
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`[commentThread] Failed to clear cached comments for ${cacheKey}:`,
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error,
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);
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}
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}
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return cacheRemoveCommentCache(this, cacheKey);
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}
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clearCommentCache(videoEventId = null) {
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if (!FEATURE_IMPROVED_COMMENT_FETCHING || typeof localStorage === "undefined") {
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return;
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}
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if (videoEventId) {
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this.removeCommentCache(this.getCommentCacheKey(videoEventId));
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return;
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}
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try {
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const keys = Object.keys(localStorage);
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keys
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.filter((key) => key.startsWith(COMMENT_CACHE_PREFIX))
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.forEach((key) => this.removeCommentCache(key));
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} catch (error) {
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if (this.logger?.warn) {
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this.logger.warn(
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"[commentThread] Failed to clear comment cache:",
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error,
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);
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}
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}
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return cacheClearCommentCache(this, videoEventId);
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}
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persistCommentCache() {
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if (!FEATURE_IMPROVED_COMMENT_FETCHING || !this.videoEventId) {
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return;
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}
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const comments = this.serializeCommentsForCache();
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this.cacheComments(this.videoEventId, comments);
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return cachePersistCommentCache(this);
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}
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serializeCommentsForCache() {
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const events = Array.from(this.eventsById.values());
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return events.sort((a, b) => {
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const aTime = Number.isFinite(a?.created_at) ? a.created_at : 0;
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const bTime = Number.isFinite(b?.created_at) ? b.created_at : 0;
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if (aTime !== bTime) {
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return aTime - bTime;
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}
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const aId = normalizeHexId(a?.id);
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const bId = normalizeHexId(b?.id);
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if (aId && bId) {
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return aId.localeCompare(bId);
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}
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if (aId) {
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return -1;
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}
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if (bId) {
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return 1;
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}
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return 0;
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});
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return cacheSerializeCommentsForCache(this);
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}
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startSubscription(target, options = {}) {
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