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index.js
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index.js
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/*
* Just promisified some indexedDb methods and put it together
* in a nice little js goodie.
*/
// ==========================
// HELPER FUNCS
// ==========================
/**
* Creates a Connection object which you can use to interact with the
* db really it just turns an array of higher order funcs into an object
* containing... normal order funcs? normal funcs.. funcs. just funcs.
* i.e. [funcA, funcB] into {funcA: funcA(..), funcB: funcB(..)}
* @param {IndexedDbConnection} db
* @param {Array} methods
*/
const createConnectionObject = (db, methods) => methods.reduce((object, fn) => {
const obj = Object.assign({}, object)
obj[fn.name] = fn(db)
return obj
}, {})
/**
* Retrieves object store with given mode.
* @param {IndexedDbConnection} db
* @param {String} storeName
* @param {String} mode
*
* @return {IndexedDbObjectStore}
*/
const getObjectStore = (db, storeName, mode) => {
const tx = db.transaction(storeName, mode)
return tx.objectStore(storeName)
}
/**
* Insert a single entry into database store.
* @param {IndexedDbConnection} db
* @param {String} storeName
* @param {Object} entry
*
* @return {function}
*/
const insertOne = (db, storeName, entry) => new Promise(
(resolve, reject) => {
const store = getObjectStore(db, storeName, 'readwrite')
const req = store.add(entry)
req.onsuccess = evt => resolve({entry, success:evt})
req.onerror = error => reject({entry, error})
}
)
/**
* Generator for inserting entries into db.
* @param {IndexedDbConnection} db
* @param {String} storeName
* @param {Array} entries
*
* @return {function}
*/
const Inserter = function *(db, storeName, entries){
const results = []
for(let entry of entries)
results.push(yield insertOne(db, storeName, entry))
return results
}
/**
* Insert multiple entries.
* @param {IndexedDbConnection} db
* @param {String} storeName
* @param {Array} entries
*
* @return {function}
*/
const insertAll = (db, storeName, entries) => {
const generator = Inserter(db, storeName, entries)
function iterate(iteration){
if(iteration.done) return iteration.value
const promise = iteration.value
const reiterate = x => iterate(generator.next(x))
return promise.then(reiterate).catch(reiterate)
}
return iterate(generator.next())
}
// ==========================
// THE REAL FUNCS
// ==========================
/**
* Clear object store.
* @param {IndexedDbConnection} db
*
* @return {function}
*/
const deleteAll = db => storeName => new Promise(
(resolve, reject) => {
const store = getObjectStore(db, storeName, 'readwrite')
const req = store.clear()
req.onsuccess = evt => resolve(evt)
req.onerror = err => reject(err)
}
)
/**
* Delete entry by id.
* @param {*} db
*/
const deleteById = db => (storeName, id) => new Promise(
(resolve, reject) => {
const store = getObjectStore(db, storeName, 'readwrite')
const req = store.delete(id)
req.onsuccess = evt => resolve(evt)
req.onerror = err => reject(err)
}
)
/**
* Combine insert and insertAll into one function calls insertAll
* if the data passed is an array, otherwise it calls insertOne.
* @param {IndexedDbConnection} db
*
* @return {function}
*/
const insert = db => (storeName, data) => Array.isArray(data)?
insertAll(db, storeName, data):insertOne(db, storeName, data)
/**
* Fetch a database store entry by id.
* @param {IndexedDbConnection} db
*
* @return {function}
*/
const fetchById = db => (storeName, id) => new Promise(
(resolve, reject) => {
const store = getObjectStore(db, storeName, 'readonly')
const req = store.get(id)
req.onsuccess = evt => resolve(evt.target.result)
req.onerror = err => reject(err)
}
)
/**
* Update a single db entry.
* @param {IndexedDbConnection} db
*
* @return {function}
*/
const updateById = db => (storeName, id, data) => new Promise(
(resolve, reject) => {
const store = getObjectStore(db, storeName, 'readwrite')
const req = store.get(id)
req.onsuccess = ({target: {result}}) => {
const update = Object.assign({}, result, data)
const innerReq = store.put(update)
innerReq.onsuccess = evt => resolve(evt.target.result)
innerReq.onerror = err => reject(err)
}
req.onerror = err => reject(err)
}
)
/**
* Fetch all database store entries.
* @param {IndexedDbConnection} db
*
* @return {function}
*/
const fetchAll = db => storeName => new Promise(
(resolve, reject) => {
const store = getObjectStore(db, storeName, 'readonly')
const req = store.getAll()
req.onsuccess = evt => resolve(evt.target.result)
req.onerror = err => reject(err)
}
)
/**
* Fetch all database store entries matching index.
* @param {IndexedDbConnection} db
*
* @return {function}
*/
const fetchByIndex = db => (storeName, index, val) => new Promise(
(resolve, reject) => {
const store = getObjectStore(db, storeName, 'readonly')
const req = store.index(index).getAll(val)
req.onsuccess = evt => resolve(evt.target.result)
req.onerror = err => reject(err)
}
)
/**
* Close the db.
* @param {IndexedDbConnection} db
*
* @return {function}
*/
const close = db => () => db.close()
/**
* Get db connection.
* @param {IndexedDbConnection} db
*
* @return {function}
*/
const getConnection = db => () => db
/**
* Open indexedDbConnection.
* @param {String} dbName
* @param {String} dbVersion
* @param {function} onUpgrade
*
* @return {Promise}
*/
const openDb = (dbName, dbVersion, onUpgrade) => new Promise(
(resolve, reject) => {
const req = indexedDB.open(dbName, dbVersion)
req.onupgradeneeded = onUpgrade
req.onsuccess = ({target: {result}}) => resolve(result)
req.onerror = err => reject(err)
}
)
/**
* Open indexedDB connection and creates a connection object
* with everything plugged in.
* @param {String} dbName
* @param {String} dbVersion
* @param {function} onUpgrade
*
* @return {Promise}
*/
const connect = (dbName, dbVersion, onUpgrade) => new Promise(
(resolve, reject) => {
const req = indexedDB.open(dbName, dbVersion)
req.onupgradeneeded = onUpgrade
req.onsuccess = ({target: {result}}) => resolve(createConnectionObject(result, [
deleteById,
deleteAll,
insert,
updateById,
fetchById,
fetchByIndex,
fetchAll,
close,
getConnection
]))
req.onerror = err => reject(err)
}
)
module.exports = {
connect,
openDb,
deleteById,
deleteAll,
insert,
updateById,
fetchById,
fetchByIndex,
fetchAll
}