78 lines
2.6 KiB
TypeScript
78 lines
2.6 KiB
TypeScript
class FileCache {
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private static dbHandle: IDBDatabase = null;
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public static initCache(success: ()=>void, error: (error: string)=>void): void {
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var request = window.indexedDB.open("fileCache", 3);
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request.onupgradeneeded = (event: any) => {
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var db: IDBDatabase = event.target.result;
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if(db.objectStoreNames.contains("files"))
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db.deleteObjectStore("files");
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if(db.objectStoreNames.contains("metadata"))
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db.deleteObjectStore("metadata");
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if(db.objectStoreNames.contains("hashes"))
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db.deleteObjectStore("hashes");
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db.createObjectStore("files", {keyPath: "name", autoIncrement: false});
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db.createObjectStore("metadata", {keyPath: "name", autoIncrement: false});
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};
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request.onerror = (event: any) => {
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error("Could not upgrade the client database to the most recent version.");
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};
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request.onsuccess = (event: any) => {
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FileCache.dbHandle = request.result;
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success();
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};
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}
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public static getMeta(fileName: string, success: (meta: FileMeta)=>void, error: (error: string)=>void): void {
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var query = FileCache.dbHandle.transaction("metadata");
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var store = query.objectStore("metadata");
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var request = store.get(fileName);
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request.onsuccess = () => {
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success(request.result);
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};
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request.onerror = (event: any) => {
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error("Could not get metadata for file "+ fileName);
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};
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}
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public static setMeta(meta: FileMeta) {
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var query = FileCache.dbHandle.transaction("metadata", "readwrite");
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var store = query.objectStore("metadata");
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store.put(meta);
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}
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public static getFile(fileName: string, success: (name: string, data: Uint8Array)=>void, error: (error: string)=>void): void {
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var query = FileCache.dbHandle.transaction("files");
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var store = query.objectStore("files");
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var request = store.get(fileName);
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request.onsuccess = () => {
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success(request.result.name, request.result.data);
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};
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request.onerror = (event: any) => {
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error("Could not get contents for file "+ fileName);
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};
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}
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public static setFile(fileName: string, data: Uint8Array) {
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var query = FileCache.dbHandle.transaction("files", "readwrite");
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var store = query.objectStore("files");
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store.put({name: fileName, data: data});
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}
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}
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class FileMeta {
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name: string;
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type: string;
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hash: string;
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} |