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This commit is contained in:
Bruno Windels 2019-02-06 22:06:56 +00:00
parent 511e91a699
commit 27be261a5d
1 changed files with 50 additions and 50 deletions
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100
src/storage/idb/utils.js
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@ -1,11 +1,11 @@
export function openDatabase(name, createObjectStore, version = undefined) {
const req = window.indexedDB.open(name, version);
req.onupgradeneeded = (ev) => {
const db = ev.target.result;
const oldVersion = ev.oldVersion;
createObjectStore(db, oldVersion, version);
};
return reqAsPromise(req);
const req = window.indexedDB.open(name, version);
req.onupgradeneeded = (ev) => {
const db = ev.target.result;
const oldVersion = ev.oldVersion;
createObjectStore(db, oldVersion, version);
};
return reqAsPromise(req);
}
export function reqAsPromise(req) {
@ -23,7 +23,7 @@ export function txnAsPromise(txn) {
}
export function iterateCursor(cursor, processValue) {
// TODO: does cursor already have a value here??
// TODO: does cursor already have a value here??
return new Promise((resolve, reject) => {
cursor.onerror = (event) => {
reject(new Error("Query failed: " + event.target.errorCode));
@ -37,9 +37,9 @@ export function iterateCursor(cursor, processValue) {
}
const isDone = processValue(cursor.value);
if (isDone) {
resolve(true);
resolve(true);
} else {
cursor.continue();
cursor.continue();
}
};
});
@ -48,56 +48,56 @@ export function iterateCursor(cursor, processValue) {
export async function fetchResults(cursor, isDone) {
const results = [];
await iterateCursor(cursor, (value) => {
results.push(value);
return isDone(results);
results.push(value);
return isDone(results);
});
return results;
}
export async function select(db, storeName, toCursor, isDone) {
if (!isDone) {
isDone = () => false;
}
if (!toCursor) {
toCursor = store => store.openCursor();
}
const tx = db.transaction([storeName], "readonly");
const store = tx.objectStore(storeName);
const cursor = toCursor(store);
return await fetchResults(cursor, isDone);
if (!isDone) {
isDone = () => false;
}
if (!toCursor) {
toCursor = store => store.openCursor();
}
const tx = db.transaction([storeName], "readonly");
const store = tx.objectStore(storeName);
const cursor = toCursor(store);
return await fetchResults(cursor, isDone);
}
export async function updateSingletonStore(db, storeName, value) {
const tx = db.transaction([storeName], "readwrite");
const store = tx.objectStore(storeName);
const cursor = await reqAsPromise(store.openCursor());
if (cursor) {
return reqAsPromise(cursor.update(storeName));
} else {
return reqAsPromise(store.add(value));
}
const tx = db.transaction([storeName], "readwrite");
const store = tx.objectStore(storeName);
const cursor = await reqAsPromise(store.openCursor());
if (cursor) {
return reqAsPromise(cursor.update(storeName));
} else {
return reqAsPromise(store.add(value));
}
}
export async function findStoreValue(db, storeName, toCursor, matchesValue) {
if (!matchesValue) {
matchesValue = () => true;
}
if (!toCursor) {
toCursor = store => store.openCursor();
}
if (!matchesValue) {
matchesValue = () => true;
}
if (!toCursor) {
toCursor = store => store.openCursor();
}
const tx = db.transaction([storeName], "readwrite");
const store = tx.objectStore(storeName);
const cursor = await reqAsPromise(toCursor(store));
let match;
const matched = await iterateCursor(cursor, (value) => {
if (matchesValue(value)) {
match = value;
return true;
}
});
if (!matched) {
throw new Error("Value not found");
}
return match;
const tx = db.transaction([storeName], "readwrite");
const store = tx.objectStore(storeName);
const cursor = await reqAsPromise(toCursor(store));
let match;
const matched = await iterateCursor(cursor, (value) => {
if (matchesValue(value)) {
match = value;
return true;
}
});
if (!matched) {
throw new Error("Value not found");
}
return match;
}