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location based feed generator","imageUrl","https://imagedelivery.net/iHX6Ovru0O7AjmyT5yZRoA/318e963f-ae91-4683-a733-6c4a3da95500/square512","14049850-28c1-11f0-89c9-c7d0e2d9e1ea","pinnedFileId","db7d92c8-58ab-11f0-bdec-f69ea79377d9","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",1,"c04d51b2-a7dc-46ca-ad6f-52f47c2906a8","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm",{"_94":95,"_134":135},"profileImageUrl","https://img.clerk.com/eyJ0eXBlIjoicHJveHkiLCJzcmMiOiJodHRwczovL2ltYWdlcy5jbGVyay5kZXYvb2F1dGhfZ2l0aHViL2ltZ18yd2Nod2N0bE1MWFdEUlRYd083ZE5pbXJ1bDAifQ","org",{"_94":95,"_138":135,"_12":114},"avatar","branch",{"_141":142,"_96":44,"_102":143,"_144":103,"_145":-5,"_146":-5,"_147":-5,"_148":-5,"_149":-5,"_150":97,"_151":95},"version",1662,"db7c07aa-58ab-11f0-bdec-f69ea79377d9","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","isOwned","file",{"_102":155,"_96":156,"_157":158,"_159":160,"_161":143,"_162":163,"_164":118,"_104":165,"_141":32,"_166":167,"_168":169,"_170":20,"_171":-5,"_98":172},"1a9c98e2-d8da-11f0-a905-42dde27851f2","checkin-cache.ts","fileId","1a9c9996-d8da-11f0-a905-42dde27851f2","parentId","829db41a-7aae-11f0-9d49-0224a6c84d84","branchId","branchVersion",1629,"latest",["D",1765709170937],"fileType","script","content","/**\n * Browser-side caching for checkins using IndexedDB\n *\n * Implements stale-while-revalidate pattern:\n * - Returns cached data immediately if fresh enough\n * - Background refreshes if cache is getting stale\n * - Full refresh if cache expired\n */\n\nimport { IDBPDatabase, openDB } from \"https://esm.sh/idb@8.0.0\";\nimport type { CheckinData } from \"../types/index.ts\";\n\n// Cache configuration\nconst DB_NAME = \"anchor-cache\";\nconst DB_VERSION = 1;\nconst CACHE_VERSION = 1;\n\n// Cache timing (in milliseconds)\n// Cache doesn't expire based on time - only invalidation events (new checkin, delete, logout)\n// Background revalidation happens after REVALIDATE threshold to ensure freshness\nconst CACHE_REVALIDATE_MS = 2 * 60 * 1000; // 2 minutes - background refresh after this\n\n// Store names\nconst FEEDS_STORE = \"feeds\";\n\ninterface CachedFeed {\n checkins: CheckinData[];\n timestamp: number;\n version: number;\n}\n\ninterface FeedStore {\n key: string;\n value: CachedFeed;\n}\n\ntype AnchorCacheDB = {\n [FEEDS_STORE]: FeedStore;\n};\n\n/**\n * Service for caching checkin feeds in IndexedDB\n */\nclass CheckinCacheService {\n private db: IDBPDatabase | null = null;\n private initPromise: Promise | null = null;\n\n /**\n * Initialize the IndexedDB database\n */\n init(): Promise {\n // Prevent multiple simultaneous initializations\n if (this.initPromise) {\n return this.initPromise;\n }\n\n if (this.db) {\n return Promise.resolve();\n }\n\n this.initPromise = this.doInit();\n return this.initPromise;\n }\n\n private async doInit(): Promise {\n try {\n // deno-lint-ignore no-explicit-any\n this.db = await openDB(DB_NAME, DB_VERSION, {\n upgrade(db) {\n // Create feeds store if it doesn't exist\n if (!db.objectStoreNames.contains(FEEDS_STORE)) {\n db.createObjectStore(FEEDS_STORE);\n }\n },\n });\n } catch (error) {\n console.warn(\"Failed to initialize IndexedDB cache:\", error);\n // Cache is optional - app works without it\n this.db = null;\n }\n }\n\n /**\n * Get cached feed for a user\n */\n async getFeed(userDid: string): Promise {\n await this.init();\n if (!this.db) return null;\n\n try {\n const key = `feed:${userDid}`;\n const cached = await this.db.get(FEEDS_STORE, key);\n\n if (!cached) return null;\n\n // Check cache version - invalidate if schema changed\n if (cached.version !== CACHE_VERSION) {\n await this.db.delete(FEEDS_STORE, key);\n return null;\n }\n\n return cached;\n } catch (error) {\n console.warn(\"Failed to read from cache:\", error);\n return null;\n }\n }\n\n /**\n * Store feed in cache\n */\n async setFeed(userDid: string, checkins: CheckinData[]): Promise {\n await this.init();\n if (!this.db) return;\n\n try {\n const key = `feed:${userDid}`;\n const entry: CachedFeed = {\n checkins,\n timestamp: Date.now(),\n version: CACHE_VERSION,\n };\n await this.db.put(FEEDS_STORE, entry, key);\n } catch (error) {\n console.warn(\"Failed to write to cache:\", error);\n }\n }\n\n /**\n * Invalidate (delete) cached feed\n */\n async invalidateFeed(userDid: string): Promise {\n await this.init();\n if (!this.db) return;\n\n try {\n const key = `feed:${userDid}`;\n await this.db.delete(FEEDS_STORE, key);\n } catch (error) {\n console.warn(\"Failed to invalidate cache:\", error);\n }\n }\n\n /**\n * Prepend a new checkin to the cached feed\n * Used after creating a new checkin for instant feedback\n */\n async prependCheckin(userDid: string, checkin: CheckinData): Promise {\n await this.init();\n if (!this.db) return;\n\n try {\n const cached = await this.getFeed(userDid);\n if (!cached) return;\n\n // Prepend new checkin and update timestamp\n const updatedCheckins = [checkin, ...cached.checkins];\n await this.setFeed(userDid, updatedCheckins);\n } catch (error) {\n console.warn(\"Failed to prepend checkin to cache:\", error);\n }\n }\n\n /**\n * Remove a checkin from the cached feed\n * Used after deleting a checkin\n */\n async removeCheckin(userDid: string, checkinUri: string): Promise {\n await this.init();\n if (!this.db) return;\n\n try {\n const cached = await this.getFeed(userDid);\n if (!cached) return;\n\n const updatedCheckins = cached.checkins.filter(\n (c) => c.uri !== checkinUri,\n );\n await this.setFeed(userDid, updatedCheckins);\n } catch (error) {\n console.warn(\"Failed to remove checkin from cache:\", error);\n }\n }\n\n /**\n * Update like count for a checkin in the cache\n */\n async updateCheckinLikes(\n userDid: string,\n checkinUri: string,\n likesCount: number,\n ): Promise {\n await this.init();\n if (!this.db) return;\n\n try {\n const cached = await this.getFeed(userDid);\n if (!cached) return;\n\n const updatedCheckins = cached.checkins.map((c) =>\n c.uri === checkinUri ? { ...c, likesCount } : c\n );\n await this.setFeed(userDid, updatedCheckins);\n } catch (error) {\n console.warn(\"Failed to update checkin likes in cache:\", error);\n }\n }\n\n /**\n * Clear all cached data for a user\n * Used on logout\n */\n async clearAll(userDid: string): Promise {\n await this.init();\n if (!this.db) return;\n\n try {\n const key = `feed:${userDid}`;\n await this.db.delete(FEEDS_STORE, key);\n } catch (error) {\n console.warn(\"Failed to clear cache:\", error);\n }\n }\n\n /**\n * Check if cached data is still valid\n * Cache doesn't expire based on time - only invalidation events\n */\n isCacheValid(_timestamp: number): boolean {\n // Cache is always valid until explicitly invalidated\n return true;\n }\n\n /**\n * Check if cached data needs background revalidation\n * This ensures we periodically refresh to catch external changes\n */\n needsRevalidation(timestamp: number): boolean {\n return Date.now() - timestamp > CACHE_REVALIDATE_MS;\n }\n}\n\n// Export singleton instance\nexport const checkinCache = new CheckinCacheService();\n","deleted","label",[173,174,156],"frontend","utils","permalink","https://www.val.town/x/tijs/anchor-appview/code/frontend/utils/checkin-cache.ts","extension","actionData","errors"]