wrap everything that can throw a idb DOMException in StorageError

as lumia gives very cryptic errors without a stacktrace.

src/matrix/error.js

@@ -5,9 +5,6 @@ export class HomeServerError extends Error {
 	}
 }
 
-export class StorageError extends Error {
-}
-
 export class RequestAbortError extends Error {
 }
 

src/matrix/storage/common.js

@@ -4,3 +4,17 @@ export const STORE_MAP = Object.freeze(STORE_NAMES.reduce((nameMap, name) => {
     nameMap[name] = name;
     return nameMap;
 }, {}));
+
+export class StorageError extends Error {
+    constructor(message, cause) {
+        let fullMessage = message;
+        if (cause) {
+            fullMessage += ": ";
+            if (cause.name) {
+                fullMessage += `(${cause.name}) `;
+            }
+            fullMessage += cause.message;
+        }
+        super(fullMessage);
+    }
+}

src/matrix/storage/idb/storage.js

@@ -1,5 +1,5 @@
 import Transaction from "./transaction.js";
-import { STORE_NAMES } from "../common.js";
+import { STORE_NAMES, StorageError } from "../common.js";
 
 export default class Storage {
 	constructor(idbDatabase) {
@@ -14,19 +14,27 @@ export default class Storage {
 	_validateStoreNames(storeNames) {
 		const idx = storeNames.findIndex(name => !STORE_NAMES.includes(name));
 		if (idx !== -1) {
-			throw new Error(`Tried to open a transaction for unknown store ${storeNames[idx]}`);
+			throw new StorageError(`Tried top, a transaction unknown store ${storeNames[idx]}`);
 		}
 	}
 
 	async readTxn(storeNames) {
 		this._validateStoreNames(storeNames);
+		try {
 			const txn = this._db.transaction(storeNames, "readonly");
 			return new Transaction(txn, storeNames);
+		} catch(err) {
+			throw new StorageError("readTxn failed", err);
+		}
 	}
 
 	async readWriteTxn(storeNames) {
 		this._validateStoreNames(storeNames);
+		try {
 			const txn = this._db.transaction(storeNames, "readwrite");
 			return new Transaction(txn, storeNames);
+		} catch(err) {
+			throw new StorageError("readWriteTxn failed", err);
+		}
 	}
 }

src/matrix/storage/idb/store.js

@@ -1,9 +1,64 @@
 import QueryTarget from "./query-target.js";
 import { reqAsPromise } from "./utils.js";
+import { StorageError } from "../common.js";
+
+class QueryTargetWrapper {
+    constructor(qt) {
+        this._qt = qt;
+    }
+    
+    openKeyCursor(...params) {
+        try {
+            return this._qt.openKeyCursor(...params);
+        } catch(err) {
+            throw new StorageError("openKeyCursor failed", err);
+        }
+    }
+    
+    openCursor(...params) {
+        try {
+            return this._qt.openCursor(...params);
+        } catch(err) {
+            throw new StorageError("openCursor failed", err);
+        }
+    }
+
+    put(...params) {
+        try {
+            return this._qt.put(...params);
+        } catch(err) {
+            throw new StorageError("put failed", err);
+        }
+    }
+
+    add(...params) {
+        try {
+            return this._qt.add(...params);
+        } catch(err) {
+            throw new StorageError("add failed", err);
+        }
+    }
+
+    get(...params) {
+        try {
+            return this._qt.get(...params);
+        } catch(err) {
+            throw new StorageError("get failed", err);
+        }
+    }
+
+    index(...params) {
+        try {
+            return this._qt.index(...params);
+        } catch(err) {
+            throw new StorageError("index failed", err);
+        }
+    }
+}
 
 export default class Store extends QueryTarget {
 	constructor(idbStore) {
-		super(idbStore);
+		super(new QueryTargetWrapper(idbStore));
 	}
 
 	get _idbStore() {
@@ -11,7 +66,7 @@ export default class Store extends QueryTarget {
 	}
 
 	index(indexName) {
-		return new QueryTarget(this._idbStore.index(indexName));
+		return new QueryTarget(new QueryTargetWrapper(this._idbStore.index(indexName)));
 	}
 
 	put(value) {

src/matrix/storage/idb/stores/TimelineEventStore.js

@@ -1,4 +1,5 @@
 import EventKey from "../../../room/timeline/EventKey.js";
+import { StorageError } from "../../common.js";
 import Platform from "../../../../Platform.js";
 
 // storage keys are defined to be unsigned 32bit numbers in WebPlatform.js, which is assumed by idb
@@ -30,6 +31,7 @@ class Range {
     }
 
     asIDBKeyRange(roomId) {
+        try {
             // only
             if (this._only) {
                 return IDBKeyRange.only(encodeKey(roomId, this._only.fragmentId, this._only.eventIndex));
@@ -63,6 +65,9 @@ class Range {
                     this._upperOpen
                 );
             }
+        } catch(err) {
+            throw new StorageError(`IDBKeyRange failed with data: ` + JSON.stringify(this), err);
+        }
     }
 }
 /*

src/matrix/storage/idb/stores/TimelineFragmentStore.js

@@ -1,3 +1,4 @@
+import { StorageError } from "../../common.js";
 import Platform from "../../../../Platform.js";
 
 function encodeKey(roomId, fragmentId) {
@@ -12,10 +13,14 @@ export default class RoomFragmentStore {
     }
 
     _allRange(roomId) {
+        try {
             return IDBKeyRange.bound(
                 encodeKey(roomId, Platform.minStorageKey),
                 encodeKey(roomId, Platform.maxStorageKey)
             );
+        } catch (err) {
+            throw new StorageError(`error from IDBKeyRange with roomId ${roomId}`, err);
+        }
     }
 
     all(roomId) {

src/matrix/storage/idb/transaction.js

@@ -1,4 +1,5 @@
 import {txnAsPromise} from "./utils.js";
+import {StorageError} from "../common.js";
 import Store from "./store.js";
 import SessionStore from "./stores/SessionStore.js";
 import RoomSummaryStore from "./stores/RoomSummaryStore.js";
@@ -21,7 +22,7 @@ export default class Transaction {
 	_idbStore(name) {
 		if (!this._allowedStoreNames.includes(name)) {
 			// more specific error? this is a bug, so maybe not ...
-			throw new Error(`Invalid store for transaction: ${name}, only ${this._allowedStoreNames.join(", ")} are allowed.`);
+			throw new StorageError(`Invalid store for transaction: ${name}, only ${this._allowedStoreNames.join(", ")} are allowed.`);
 		}
 		return new Store(this._txn.objectStore(name));
 	}

src/matrix/storage/idb/utils.js

@@ -1,3 +1,5 @@
+import { StorageError } from "../common.js";
+
 export function openDatabase(name, createObjectStore, version) {
     const req = window.indexedDB.open(name, version);
     req.onupgradeneeded = (ev) => {
@@ -8,17 +10,21 @@ export function openDatabase(name, createObjectStore, version) {
     return reqAsPromise(req);
 }
 
+function wrapError(err) {
+    return new StorageError(`wrapped DOMException`, err);
+}
+
 export function reqAsPromise(req) {
     return new Promise((resolve, reject) => {
         req.addEventListener("success", event => resolve(event.target.result));
-        req.addEventListener("error", event => reject(event.target.error));
+        req.addEventListener("error", event => reject(wrapError(event.target.error)));
     });
 }
 
 export function txnAsPromise(txn) {
     return new Promise((resolve, reject) => {
         txn.addEventListener("complete", resolve);
-        txn.addEventListener("abort", reject);
+        txn.addEventListener("abort", e => reject(wrapError(e)));
     });
 }
 
@@ -42,6 +48,8 @@ export function iterateCursor(cursor, processValue) {
                 cursor.continue(jumpTo);
             }
         };
+    }).catch(err => {
+        throw new StorageError("iterateCursor failed", err);
     });
 }
 
@@ -97,7 +105,7 @@ export async function findStoreValue(db, storeName, toCursor, matchesValue) {
         }
     });
     if (!matched) {
-        throw new Error("Value not found");
+        throw new StorageError("Value not found");
     }
     return match;
 }

src/matrix/sync.js

@@ -1,8 +1,4 @@
-import {
+import {RequestAbortError} from "./error.js";
-    RequestAbortError,
-    HomeServerError,
-    StorageError
-} from "./error.js";
 import EventEmitter from "../EventEmitter.js";
 
 const INCREMENTAL_TIMEOUT = 30000;
@@ -111,7 +107,8 @@ export default class Sync extends EventEmitter {
             await syncTxn.complete();
             console.info("syncTxn committed!!");
         } catch (err) {
-            throw new StorageError("unable to commit sync tranaction", err);
+            console.error("unable to commit sync tranaction", err.message);
+            throw err;
         }
         // emit room related events after txn has been closed
         for(let {room, changes} of roomChanges) {