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Migrate IndexedDB to Dexie.js #19

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Merged
Mr-Python-in-China merged 3 commits into from
Nov 17, 2025
Merged

Migrate IndexedDB to Dexie.js #19

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99da262
Checkpoint from VS Code for coding agent session
Mr-Python-in-China Nov 13, 2025
d4fbbdd
Migrate IndexedDB to Dexie.js for cleaner API
Copilot Nov 13, 2025
523c3be
Fix data compatibility - preserve existing IndexedDB structure
Copilot Nov 13, 2025
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15 changes: 15 additions & 0 deletions package-lock.json
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2 changes: 2 additions & 0 deletions package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@
"axios": "^1.12.2",
"browser-update": "^3.3.63",
"dayjs": "^1.11.18",
"dexie": "^4.2.1",
"lodash": "^4.17.21",
"lodash.debounce": "^4.0.8",
"react": "^19.1.1",
Expand All @@ -58,6 +59,7 @@
"devDependencies": {
"@eslint/js": "^9.36.0",
"@types/browser-update": "^3.3.3",
"@types/dexie": "^1.3.32",
"@types/fontkit": "^2.0.8",
"@types/lodash": "^4.17.20",
"@types/lodash.debounce": "^4.0.9",
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175 changes: 37 additions & 138 deletions src/utils/indexedDBUtils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,51 +5,36 @@ import type {
} from "@/types/contestData";
import configSchema from "../../typst-template/config-schema.json";
import Ajv from "ajv";

const DB_NAME = "cnoi-statement-generator";
const DB_VERSION = 1;
const CONFIG_STORE = "config";
const IMAGE_STORE = "images";
import Dexie from "dexie";

const ajv = new Ajv({ allErrors: true });
const validateSchema = ajv.compile(configSchema);

/**
* Open IndexedDB connection
* Dexie database schema
*/
function openDB(): Promise<IDBDatabase> {
return new Promise((resolve, reject) => {
const request = indexedDB.open(DB_NAME, DB_VERSION);

request.onerror = () => reject(request.error);
request.onsuccess = () => resolve(request.result);

request.onupgradeneeded = (event) => {
const db = (event.target as IDBOpenDBRequest).result;

// Create config store
if (!db.objectStoreNames.contains(CONFIG_STORE)) {
db.createObjectStore(CONFIG_STORE);
}

// Create image store with uuid as key
if (!db.objectStoreNames.contains(IMAGE_STORE)) {
db.createObjectStore(IMAGE_STORE, { keyPath: "uuid" });
}
};
});
class CnoiDatabase extends Dexie {
// Using Table instead of EntityTable to support non-inlined keys
config!: Dexie.Table<StoredContestData, string>;
images!: Dexie.Table<EditorImageData, string>;

constructor() {
super("cnoi-statement-generator");
this.version(1).stores({
config: "", // Empty string means the key is not part of the object (out-of-line key)
images: "uuid",
});
}
}

const db = new CnoiDatabase();

/**
* Save config to IndexedDB
*/
export async function saveConfigToDB(
data: ContestDataWithImages,
): Promise<void> {
const db = await openDB();
const transaction = db.transaction(CONFIG_STORE, "readwrite");
const store = transaction.objectStore(CONFIG_STORE);

// Remove url field from images for storage
const storedData: StoredContestData = {
...data,
Expand All @@ -59,18 +44,7 @@ export async function saveConfigToDB(
})),
};

store.put(storedData, "current");

return new Promise((resolve, reject) => {
transaction.oncomplete = () => {
db.close();
resolve();
};
transaction.onerror = () => {
db.close();
reject(transaction.error);
};
});
await db.config.put(storedData, "current");
}

/**
Expand All @@ -80,124 +54,49 @@ export async function loadConfigFromDB(): Promise<{
data: StoredContestData;
images: Map<string, Blob>; // uuid -> Blob
} | null> {
const db = await openDB();
const transaction = db.transaction([CONFIG_STORE, IMAGE_STORE], "readonly");
const configStore = transaction.objectStore(CONFIG_STORE);
const imageStore = transaction.objectStore(IMAGE_STORE);

return new Promise((resolve, reject) => {
const configRequest = configStore.get("current");

configRequest.onsuccess = async () => {
const storedData = configRequest.result as StoredContestData | undefined;

if (!storedData) {
db.close();
resolve(null);
return;
}
const storedData = await db.config.get("current");

// Load all images
const imageMap = new Map<string, Blob>();
const imagePromises = (storedData.images || []).map(
(img) =>
new Promise<void>((resolveImg, rejectImg) => {
const imgRequest = imageStore.get(img.uuid);
imgRequest.onsuccess = () => {
const imageData = imgRequest.result as
| EditorImageData
| undefined;
if (imageData) {
imageMap.set(imageData.uuid, imageData.blob);
}
resolveImg();
};
imgRequest.onerror = () => rejectImg(imgRequest.error);
}),
);
if (!storedData) {
return null;
}

try {
await Promise.all(imagePromises);
db.close();
// Load all images
const imageMap = new Map<string, Blob>();
const imageUuids = (storedData.images || []).map((img) => img.uuid);

resolve({ data: storedData, images: imageMap });
} catch (error) {
db.close();
reject(error);
if (imageUuids.length > 0) {
const images = await db.images.bulkGet(imageUuids);
images.forEach((imageData) => {
if (imageData) {
imageMap.set(imageData.uuid, imageData.blob);
}
};
});
}

configRequest.onerror = () => {
db.close();
reject(configRequest.error);
};
});
return { data: storedData, images: imageMap };
}

/**
* Save image to IndexedDB
*/
export async function saveImageToDB(uuid: string, blob: Blob): Promise<void> {
const db = await openDB();
const transaction = db.transaction(IMAGE_STORE, "readwrite");
const store = transaction.objectStore(IMAGE_STORE);

const imageData: EditorImageData = { uuid, blob };
store.put(imageData);

return new Promise((resolve, reject) => {
transaction.oncomplete = () => {
db.close();
resolve();
};
transaction.onerror = () => {
db.close();
reject(transaction.error);
};
});
await db.images.put({ uuid, blob });
}

/**
* Delete image from IndexedDB
*/
export async function deleteImageFromDB(uuid: string): Promise<void> {
const db = await openDB();
const transaction = db.transaction(IMAGE_STORE, "readwrite");
const store = transaction.objectStore(IMAGE_STORE);

store.delete(uuid);

return new Promise((resolve, reject) => {
transaction.oncomplete = () => {
db.close();
resolve();
};
transaction.onerror = () => {
db.close();
reject(transaction.error);
};
});
await db.images.delete(uuid);
}

/**
* Clear all data from IndexedDB
*/
export async function clearDB(): Promise<void> {
const db = await openDB();
const transaction = db.transaction([CONFIG_STORE, IMAGE_STORE], "readwrite");

transaction.objectStore(CONFIG_STORE).clear();
transaction.objectStore(IMAGE_STORE).clear();

return new Promise((resolve, reject) => {
transaction.oncomplete = () => {
db.close();
resolve();
};
transaction.onerror = () => {
db.close();
reject(transaction.error);
};
await db.transaction("rw", [db.config, db.images], async () => {
await db.config.clear();
await db.images.clear();
});
}

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