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IndexedDb.scala
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IndexedDb.scala
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package japgolly.webapputil.indexeddb
import cats.kernel.Eq
import japgolly.scalajs.react._
import japgolly.scalajs.react.util.Util.{identity => identityFn}
import japgolly.univeq.UnivEqCats._
import japgolly.webapputil.indexeddb.TxnMode._
import org.scalajs.dom._
import scala.annotation.elidable
import scala.scalajs.js
import scala.util.{Failure, Success, Try}
final class IndexedDb(raw: IDBFactory) {
import IndexedDb._
import IndexedDb.Internals._
def open(name: DatabaseName): OpenResult =
_open(raw.open(name.value))
def open(name: DatabaseName, version: Int): OpenResult =
_open(raw.open(name.value, version))
private def _open(rawOpen: => IDBOpenDBRequest[IDBDatabase]): OpenResult =
callbacks => {
def create(): IDBOpenDBRequest[IDBDatabase] = {
val r = rawOpen
// r.onblocked = callbacks.blocked.toJsFn1
r.onupgradeneeded = e => {
val db = new DatabaseInVersionChange(r.result)
val args = versionChange(db, e)
callbacks.upgradeNeeded(args).runNow()
}
r
}
asyncRequest(create()) { r =>
val rawDb = r.result
rawDb.onversionchange = e => {
try {
val args = versionChange(new DatabaseInVersionChange(rawDb), e)
callbacks.versionChange(args).runNow()
} finally {
// We close the DB at the end of this event on matter what so that other connections don't block and we
// don't have to handle onblocked events.
rawDb.close()
// The onclose event handler is only fired "when the database is unexpectedly closed".
// Therefore we call it here explicitly.
// https://developer.mozilla.org/en-US/docs/Web/API/IDBDatabase/onclose
callbacks.closed.runNow()
}
}
rawDb.onclose = _ => {
callbacks.closed.runNow()
}
new Database(rawDb, onClose = callbacks.closed)
}
}
def deleteDatabase(name: DatabaseName): AsyncCallback[Unit] =
asyncRequest_(raw.deleteDatabase(name.value))
}
// =====================================================================================================================
object IndexedDb {
def apply(raw: IDBFactory): IndexedDb =
new IndexedDb(raw)
def global(): Option[IndexedDb] =
try {
window.indexedDB.toOption.map(apply)
} catch {
case _: Throwable => None
}
// ===================================================================================================================
// Main types and classes
import Internals._
final case class DatabaseName(value: String)
type OpenResult = OpenCallbacks => AsyncCallback[Database]
/** Callbacks to install when opening a DB.
*
* Note 1: On `versionChange`, the DB connection will be closed automatically.
*
* Note 2: There's no `blocked` handler because we currently don't allow blocking. To quote the idb spec:
* if "there are open connections that don’t close in response to a versionchange event, the request will be
* blocked until all they close".
*/
final case class OpenCallbacks(upgradeNeeded: VersionChange => Callback,
versionChange: VersionChange => Callback = _ => Callback.empty,
closed : Callback = Callback.empty)
final case class Error(event: ErrorEvent) extends RuntimeException(
event.asInstanceOf[js.Dynamic].message.asInstanceOf[js.UndefOr[String]].getOrElse(null)
) {
// Note: allowing .message to be undefined is presumably only required due to use of fake-indexeddb in tests
val msg: String =
event.asInstanceOf[js.Dynamic].message.asInstanceOf[js.UndefOr[String]].getOrElse("")
@elidable(elidable.FINEST)
override def toString =
s"IndexedDb.Error($msg)"
def isStoredDatabaseHigherThanRequested: Boolean = {
// Chrome: The requested version (1) is less than the existing version (2).
// Firefox: The operation failed because the stored database is a higher version than the version requested.
msg.contains("version") && (msg.contains("higher") || msg.contains("less than"))
}
}
final case class VersionChange(db: DatabaseInVersionChange, oldVersion: Int, newVersion: Option[Int]) {
def createObjectStore[K, V](defn: ObjectStoreDef[K, V], createdInDbVer: Int): Callback =
Callback.when(oldVersion < createdInDbVer && newVersion.exists(_ >= createdInDbVer))(
db.createObjectStore(defn))
}
final class DatabaseInVersionChange(raw: IDBDatabase) {
def createObjectStore[K, V](defn: ObjectStoreDef[K, V]): Callback =
Callback {
raw.createObjectStore(defn.name)
}
}
final class Database(raw: IDBDatabase, onClose: Callback) {
def atomic[K, V](store: ObjectStoreDef.Async[K, V]): AtomicAsyncDsl[K, V] =
new AtomicAsyncDsl(this, store)
def close: Callback = {
val actuallyClose =
Callback(raw.close()).attempt
// The onclose event handler is only fired "when the database is unexpectedly closed".
// Therefore we call it here explicitly.
// https://developer.mozilla.org/en-US/docs/Web/API/IDBDatabase/onclose
actuallyClose >> onClose
}
def compareAndSet(stores: ObjectStoreDef[_, _]*): CasDsl1 =
new CasDsl1(this, stores)
def transactionRO: RunTxnDsl1[RO] =
new RunTxnDsl1(raw, TxnDslRO, IDBTransactionMode.readonly)
def transactionRW: RunTxnDsl1[RW] =
new RunTxnDsl1(raw, TxnDslRW, IDBTransactionMode.readwrite)
// Convenience methods
/** Note: insert only */
def add[K, V](store: ObjectStoreDef.Async[K, V])(key: K, value: V): AsyncCallback[Unit] =
store.encode(value).flatMap(add(store.sync)(key, _))
/** Note: insert only */
def add[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, value: V): AsyncCallback[Unit] =
transactionRW(store)(_.objectStore(store).flatMap(_.add(key, value)))
/** Note: insert only */
def addWhenDefined[K, V](store: ObjectStoreDef.Async[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
AsyncCallback.traverseOption_(value)(add(store)(key, _))
/** Note: insert only */
def addWhenDefined[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
AsyncCallback.traverseOption_(value)(add(store)(key, _))
def clear[K, V](store: ObjectStoreDef[K, V]): AsyncCallback[Unit] =
transactionRW(store)(_.objectStore(store.sync).flatMap(_.clear))
def delete[K, V](store: ObjectStoreDef[K, V])(key: K): AsyncCallback[Unit] =
transactionRW(store)(_.objectStore(store.sync).flatMap(_.delete(key)))
def get[K, V](store: ObjectStoreDef.Async[K, V])(key: K): AsyncCallback[Option[V]] =
get(store.sync)(key).flatMap(AsyncCallback.traverseOption(_)(_.decode))
def get[K, V](store: ObjectStoreDef.Sync[K, V])(key: K): AsyncCallback[Option[V]] =
transactionRO(store)(_.objectStore(store).flatMap(_.get(key)))
def getAllKeys[K, V](store: ObjectStoreDef[K, V]): AsyncCallback[Vector[K]] =
transactionRO(store)(_.objectStore(store.sync).flatMap(_.getAllKeys))
def getAllValues[K, V](store: ObjectStoreDef.Async[K, V]): AsyncCallback[Vector[V]] =
getAllValues(store.sync).flatMap(AsyncCallback.traverse(_)(_.decode))
def getAllValues[K, V](store: ObjectStoreDef.Sync[K, V]): AsyncCallback[Vector[V]] =
transactionRO(store)(_.objectStore(store).flatMap(_.getAllValues))
/** aka upsert */
def put[K, V](store: ObjectStoreDef.Async[K, V])(key: K, value: V): AsyncCallback[Unit] =
store.encode(value).flatMap(put(store.sync)(key, _))
/** aka upsert */
def put[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, value: V): AsyncCallback[Unit] =
transactionRW(store)(_.objectStore(store).flatMap(_.put(key, value)))
/** aka upsert or delete */
def putOrDelete[K, V](store: ObjectStoreDef.Async[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
value match {
case Some(v) => put(store)(key, v)
case None => delete(store)(key)
}
/** aka upsert or delete */
def putOrDelete[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
value match {
case Some(v) => put(store)(key, v)
case None => delete(store)(key)
}
/** aka upsert */
def putWhenDefined[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
AsyncCallback.traverseOption_(value)(put(store)(key, _))
/** aka upsert */
def putWhenDefined[K, V](store: ObjectStoreDef.Async[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
AsyncCallback.traverseOption_(value)(put(store)(key, _))
} // class Database
final class ObjectStore[K, V](val defn: ObjectStoreDef.Sync[K, V]) {
import defn.{keyCodec, valueCodec}
private implicit def autoWrap[M <: TxnMode, A](s: TxnStep[M, A]): Txn[M, A] =
Txn(s)
/** Note: insert only */
def add(key: K, value: V): Txn[RW, Unit] = {
val k = keyCodec.encode(key)
TxnDslRW.eval(valueCodec.encode(value)).flatMap(TxnStep.StoreAdd(this, k, _))
}
/** Note: insert only */
def addWhenDefined(key: K, value: Option[V]): Txn[RW, Unit] =
value.fold[Txn[RW, Unit]](TxnStep.unit)(add(key, _))
def clear: Txn[RW, Unit] =
TxnStep.StoreClear(this)
def delete(key: K): Txn[RW, Unit] =
TxnStep.StoreDelete(this, keyCodec.encode(key))
def get(key: K): Txn[RO, Option[V]] =
TxnStep.StoreGet(this, keyCodec.encode(key))
def getAllKeys: Txn[RO, Vector[K]] =
TxnStep.StoreGetAllKeys(this)
def getAllValues: Txn[RO, Vector[V]] =
TxnStep.StoreGetAllVals(this)
def modify(key: K)(f: V => V): Txn[RW, Option[V]] =
get(key).flatMap {
case Some(v1) =>
val v2 = f(v1)
put(key, v2).map(_ => Some(v2))
case None =>
TxnDslRW.none
}
def modifyOption(key: K)(f: Option[V] => Option[V]): Txn[RW, Option[V]] =
for {
o1 <- get(key)
o2 = f(o1)
_ <- putOrDelete(key, o2)
} yield o2
/** aka upsert */
def put(key: K, value: V): Txn[RW, Unit] = {
val k = keyCodec.encode(key)
TxnDslRW.eval(valueCodec.encode(value)).flatMap(TxnStep.StorePut(this, k, _))
}
/** aka upsert or delete */
def putOrDelete(key: K, value: Option[V]): Txn[RW, Unit] =
value match {
case Some(v) => put(key, v)
case None => delete(key)
}
/** aka upsert */
def putWhenDefined(key: K, value: Option[V]): Txn[RW, Unit] =
value.fold[Txn[RW, Unit]](TxnStep.unit)(put(key, _))
}
// ===================================================================================================================
// DSLs
final class AtomicAsyncDsl[K, V](db: Database, store: ObjectStoreDef.Async[K, V]) {
/** Performs an async modification on a store value.
*
* This only modifies an existing value. Use [[modifyAsyncOption()]] to upsert and/or delete values.
*
* This uses [[compareAndSet()]] for atomicity and thread-safety.
*
* @return If the value exists, this returns the previous and updated values
*/
def modify(key: K)(f: V => V): AsyncCallback[Option[(V, V)]] =
modifyAsync(key)(v => AsyncCallback.pure(f(v)))
/** Performs an async modification on a store value.
*
* This only modifies an existing value. Use [[modifyAsyncOption()]] to upsert and/or delete values.
*
* This uses [[compareAndSet()]] for atomicity and thread-safety.
*
* @return If the value exists, this returns the previous and updated values
*/
def modifyAsync(key: K)(f: V => AsyncCallback[V]): AsyncCallback[Option[(V, V)]] =
db
.compareAndSet(store)
.getValueAsync(store)(key)
.mapAsync(AsyncCallback.traverseOption(_)(v1 => f(v1).map((v1, _))))
.putResultWhenDefinedBy(store)(key, _.map(_._2))
/** Performs an async modification on an optional store value.
*
* This uses [[compareAndSet()]] for atomicity and thread-safety.
*
* @return The previous and updated values
*/
def modifyOption(key: K)(f: Option[V] => Option[V]): AsyncCallback[(Option[V], Option[V])] =
modifyOptionAsync(key)(v => AsyncCallback.pure(f(v)))
/** Performs an async modification on an optional store value.
*
* This uses [[compareAndSet()]] for atomicity and thread-safety.
*
* @return The previous and updated values
*/
def modifyOptionAsync(key: K)(f: Option[V] => AsyncCallback[Option[V]]): AsyncCallback[(Option[V], Option[V])] =
db
.compareAndSet(store)
.getValueAsync(store)(key)
.mapAsync { o1 => f(o1).map((o1, _)) }
.putOrDeleteResultBy(store)(key, _._2)
}
final class RunTxnDsl1[M <: TxnMode] private[IndexedDb](raw: IDBDatabase, txnDsl: TxnDsl[M], mode: IDBTransactionMode) {
def apply(stores: ObjectStoreDef[_, _]*): RunTxnDsl2[M] =
new RunTxnDsl2(raw, txnDsl, mode, mkStoreArray(stores))
}
final class RunTxnDsl2[M <: TxnMode] private[IndexedDb](raw: IDBDatabase, txnDsl: TxnDsl[M], mode: IDBTransactionMode, stores: js.Array[String]) {
def apply[A](f: TxnDsl[M] => Txn[M, A]): AsyncCallback[A] = {
val x = CallbackTo.pure(f(txnDsl))
sync(_ => x)
}
def sync[A](dslCB: TxnDsl[M] => CallbackTo[Txn[M, A]]): AsyncCallback[A] = {
@inline def startRawTxn(complete: Try[Unit] => Callback) = {
val txn = raw.transaction(stores, mode)
txn.onerror = event => {
complete(Failure(Error(event))).runNow()
}
txn.oncomplete = complete(success_).toJsFn1
txn
}
for {
dsl <- dslCB(txnDsl).asAsyncCallback
(awaitTxnCompletion, complete) <- AsyncCallback.promise[Unit].asAsyncCallback
result <- AsyncCallback.suspend {
val txn = startRawTxn(complete)
interpretTxn(txn, dsl)
}
_ <- awaitTxnCompletion
} yield result
}
def async[A](dsl: TxnDsl[M] => AsyncCallback[Txn[M, A]]): AsyncCallback[A] =
// Note: This is safer than it looks.
// 1) This is `Dsl => AsyncCallback[Txn[A]]`
// and not `Dsl => Txn[AsyncCallback[A]]`
// 2) Everything within Txn is still synchronous and lawful
// 3) Only one transaction is created (i.e. only one call to `apply`)
dsl(txnDsl).flatMap(txnA => apply(_ => txnA))
}
final class CasDsl1(db: Database, stores: Seq[ObjectStoreDef[_, _]]) {
def get[A](f: TxnDsl[RO] => Txn[RO, A])(implicit e: Eq[A]) =
getAndCompareBy(f)(e.eqv)
def getAndCompareBy_==[A](f: TxnDsl[RO] => Txn[RO, A]) =
getAndCompareBy(f)(_ == _)
def getAndCompareBy[A](f: TxnDsl[RO] => Txn[RO, A])(eql: (A, A) => Boolean) =
new CasDsl2[A](db, stores, f(TxnDslRO), eql)
/** Note: CAS comparison is on the raw IDB value, i.e. the result prior to async decoding */
def getValueAsync[K, V](store: ObjectStoreDef.Async[K, V])(key: K): CasDsl3[Option[store.Value], Option[V]] =
get(_.objectStore(store).flatMap(_.get(key)))
.mapAsync(AsyncCallback.traverseOption(_)(_.decode))
/** Note: CAS comparison is on `Option[V]`, i.e. the decoded result */
def getValueSync[K, V](store: ObjectStoreDef.Sync[K, V])(key: K)(implicit e: Eq[Option[V]]): CasDsl2[Option[V]] =
get(_.objectStore(store).flatMap(_.get(key)))
def getAllKeys[K, V](store: ObjectStoreDef[K, V])(implicit e: Eq[Vector[K]]): CasDsl2[Vector[K]] =
get(_.objectStore(store.sync).flatMap(_.getAllKeys))
def getAllValuesAsync[K, V](store: ObjectStoreDef.Async[K, V]): CasDsl3[Vector[store.Value], Vector[V]] =
get(_.objectStore(store).flatMap(_.getAllValues))
.mapAsync(AsyncCallback.traverse(_)(_.decode))
def getAllValuesSync[K, V](store: ObjectStoreDef.Sync[K, V])(implicit e: Eq[Vector[V]]): CasDsl2[Vector[V]] =
get(_.objectStore(store.sync).flatMap(_.getAllValues))
}
sealed trait CasDsl23[A, B] {
def mapAsync[C](f: B => AsyncCallback[C]): CasDsl3[A, C]
final def map[C](f: B => C) =
mapAsync(b => AsyncCallback.pure(f(b)))
final def mapSync[C](f: B => CallbackTo[C]) =
mapAsync(f(_).asAsyncCallback)
}
final class CasDsl2[A](db: Database, stores: Seq[ObjectStoreDef[_, _]], get: Txn[RO, A], eql: (A, A) => Boolean) extends CasDsl23[A, A] {
private def next = mapAsync(AsyncCallback.pure)
override def mapAsync[C](f: A => AsyncCallback[C]) =
new CasDsl3[A, C](db, stores, get, eql, f)
def set[C](set: TxnDsl[RW] => A => Txn[RW, C]): AsyncCallback[C] =
next.set { dsl => (a, _) => set(dsl)(a) }
}
final class CasDsl3[A, B](db: Database, stores: Seq[ObjectStoreDef[_, _]], get: Txn[RO, A], eql: (A, A) => Boolean, prep: A => AsyncCallback[B]) extends CasDsl23[A, B] {
override def mapAsync[C](f: B => AsyncCallback[C]) =
new CasDsl3[A, C](db, stores, get, eql, prep(_).flatMap(f))
def set[C](set: TxnDsl[RW] => (A, B) => Txn[RW, C]): AsyncCallback[C] = {
val txnRO = db.transactionRO(stores: _*)
val txnRW = db.transactionRW(stores: _*)
def loopTxn(a: A, b: B): AsyncCallback[Either[A, C]] =
txnRW { dsl =>
(get: Txn[RW, A]).flatMap { a2 =>
if (eql(a, a2))
set(dsl)(a, b).map(Right(_))
else
dsl.pure(Left(a2))
}
}
def loop(a: A): AsyncCallback[Either[A, C]] =
for {
b <- prep(a)
e <- loopTxn(a, b)
} yield e
txnRO(_ => get).flatMap(AsyncCallback.tailrec(_)(loop))
}
// Convenience methods
/** Note: insert only */
def add[K, V](store: ObjectStoreDef.Async[K, V])(key: K, value: V): AsyncCallback[Unit] =
store.encode(value).flatMap(add(store.sync)(key, _))
/** Note: insert only */
def add[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, value: V): AsyncCallback[Unit] =
setConst(_.objectStore(store).flatMap(_.add(key, value)))
/** Note: insert only */
def addResult[K](store: ObjectStoreDef.Async[K, B])(key: K): AsyncCallback[B] =
addResultBy(store)(key, identityFn)
/** Note: insert only */
def addResult[K](store: ObjectStoreDef.Sync[K, B])(key: K): AsyncCallback[B] =
addResultBy(store)(key, identityFn)
/** Note: insert only */
def addResultBy[K, V](store: ObjectStoreDef.Async[K, V])(key: K, f: B => V): AsyncCallback[B] =
mapAsync { b => store.encode(f(b)).map((b, _)) }
.addResultBy(store.sync)(key, _._2)
.map(_._1)
/** Note: insert only */
def addResultBy[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, f: B => V): AsyncCallback[B] =
set(dsl => (_, b) =>
for {
s <- dsl.objectStore(store)
_ <- s.add(key, f(b))
} yield b
)
/** Note: insert only */
@inline def addResultWhenDefined[K, V](store: ObjectStoreDef.Async[K, V])(key: K)(implicit ev: B => Option[V]): AsyncCallback[B] =
addResultWhenDefinedBy(store)(key, ev)
/** Note: insert only */
@inline def addResultWhenDefined[K, V](store: ObjectStoreDef.Sync[K, V])(key: K)(implicit ev: B => Option[V]): AsyncCallback[B] =
addResultWhenDefinedBy(store)(key, ev)
/** Note: insert only */
def addResultWhenDefinedBy[K, V](store: ObjectStoreDef.Async[K, V])(key: K, f: B => Option[V]): AsyncCallback[B] =
mapAsync { b => AsyncCallback.traverseOption(f(b))(store.encode(_)).map((b, _)) }
.addResultWhenDefinedBy(store.sync)(key, _._2)
.map(_._1)
/** Note: insert only */
def addResultWhenDefinedBy[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, f: B => Option[V]): AsyncCallback[B] =
set(dsl => (_, b) =>
f(b) match {
case Some(v) =>
for {
s <- dsl.objectStore(store)
_ <- s.add(key, v)
} yield b
case None =>
dsl.pure(b)
}
)
/** Note: insert only */
def addWhenDefined[K, V](store: ObjectStoreDef.Async[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
value.fold(AsyncCallback.unit)(add(store)(key, _))
/** Note: insert only */
def addWhenDefined[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
value.fold(AsyncCallback.unit)(add(store)(key, _))
def clear[K, V](store: ObjectStoreDef[K, V]): AsyncCallback[Unit] =
setConst(_.objectStore(store.sync).flatMap(_.clear))
def delete[K, V](store: ObjectStoreDef[K, V])(key: K): AsyncCallback[Unit] =
setConst(_.objectStore(store.sync).flatMap(_.delete(key)))
/** aka upsert */
def put[K, V](store: ObjectStoreDef.Async[K, V])(key: K, value: V): AsyncCallback[Unit] =
store.encode(value).flatMap(put(store.sync)(key, _))
/** aka upsert */
def put[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, value: V): AsyncCallback[Unit] =
setConst(_.objectStore(store).flatMap(_.put(key, value)))
/** aka upsert or delete */
def putOrDelete[K, V](store: ObjectStoreDef.Async[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
value match {
case Some(v) => put(store)(key, v)
case None => delete(store)(key)
}
/** aka upsert or delete */
def putOrDelete[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
value match {
case Some(v) => put(store)(key, v)
case None => delete(store)(key)
}
/** Note: upsert */
@inline def putOrDeleteResult[K, V](store: ObjectStoreDef.Async[K, V])(key: K)(implicit ev: B => Option[V]): AsyncCallback[B] =
putOrDeleteResultBy(store)(key, ev)
/** Note: upsert */
@inline def putOrDeleteResult[K, V](store: ObjectStoreDef.Sync[K, V])(key: K)(implicit ev: B => Option[V]): AsyncCallback[B] =
putOrDeleteResultBy(store)(key, ev)
/** Note: upsert */
def putOrDeleteResultBy[K, V](store: ObjectStoreDef.Async[K, V])(key: K, f: B => Option[V]): AsyncCallback[B] =
mapAsync { b => AsyncCallback.traverseOption(f(b))(store.encode(_)).map((b, _)) }
.putOrDeleteResultBy(store.sync)(key, _._2)
.map(_._1)
/** Note: upsert */
def putOrDeleteResultBy[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, f: B => Option[V]): AsyncCallback[B] =
set(dsl => (_, b) =>
for {
s <- dsl.objectStore(store)
_ <- s.putOrDelete(key, f(b))
} yield b
)
/** Note: upsert */
def putResult[K](store: ObjectStoreDef.Async[K, B])(key: K): AsyncCallback[B] =
putResultBy(store)(key, identityFn)
/** Note: upsert */
def putResult[K](store: ObjectStoreDef.Sync[K, B])(key: K): AsyncCallback[B] =
putResultBy(store)(key, identityFn)
/** Note: upsert */
def putResultBy[K, V](store: ObjectStoreDef.Async[K, V])(key: K, f: B => V): AsyncCallback[B] =
mapAsync { b =>
val v = f(b)
for {
enc <- store.encode(v)
} yield (b, enc)
}
.putResultBy(store.sync)(key, _._2)
.map(_._1)
/** Note: upsert */
def putResultBy[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, f: B => V): AsyncCallback[B] =
set(dsl => (_, b) =>
for {
s <- dsl.objectStore(store)
_ <- s.put(key, f(b))
} yield b
)
/** Note: upsert */
@inline def putResultWhenDefined[K, V](store: ObjectStoreDef.Async[K, V])(key: K)(implicit ev: B => Option[V]): AsyncCallback[B] =
putResultWhenDefinedBy(store)(key, ev)
/** Note: upsert */
@inline def putResultWhenDefined[K, V](store: ObjectStoreDef.Sync[K, V])(key: K)(implicit ev: B => Option[V]): AsyncCallback[B] =
putResultWhenDefinedBy(store)(key, ev)
/** Note: upsert */
def putResultWhenDefinedBy[K, V](store: ObjectStoreDef.Async[K, V])(key: K, f: B => Option[V]): AsyncCallback[B] =
mapAsync { b => AsyncCallback.traverseOption(f(b))(store.encode(_)).map((b, _)) }
.putResultWhenDefinedBy(store.sync)(key, _._2)
.map(_._1)
/** Note: upsert */
def putResultWhenDefinedBy[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, f: B => Option[V]): AsyncCallback[B] =
set(dsl => (_, b) =>
f(b) match {
case Some(v) =>
for {
s <- dsl.objectStore(store)
_ <- s.put(key, v)
} yield b
case None =>
dsl.pure(b)
}
)
/** Note: upsert */
def putWhenDefined[K, V](store: ObjectStoreDef.Async[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
value.fold(AsyncCallback.unit)(put(store)(key, _))
/** Note: upsert */
def putWhenDefined[K, V](store: ObjectStoreDef.Sync[K, V])(key: K, value: Option[V]): AsyncCallback[Unit] =
value.fold(AsyncCallback.unit)(put(store)(key, _))
def setConst[C](set: TxnDsl[RW] => Txn[RW, C]): AsyncCallback[C] =
this.set(dsl => (_, _) => set(dsl))
}
// ===================================================================================================================
private object Internals {
val success_ = Success(())
def asyncRequest_[R <: IDBRequest[Any, _]](act: => R): AsyncCallback[Unit] =
asyncRequest(act)(_ => ())
def asyncRequest[R <: IDBRequest[Any, _], A](act: => R)(onSuccess: R => A): AsyncCallback[A] =
AsyncCallback.promise[A].asAsyncCallback.flatMap { case (promise, complete) =>
val raw = act
raw.onerror = event => {
complete(Failure(Error(event))).runNow()
}
raw.onsuccess = _ => {
complete(Try(onSuccess(raw))).runNow()
}
promise
}
def versionChange(db: DatabaseInVersionChange, e: IDBVersionChangeEvent): VersionChange =
VersionChange(db, e.oldVersion.toInt, e.newVersionOption.map(_.toInt))
def mkStoreArray(stores: Seq[ObjectStoreDef[_, _]]): js.Array[String] = {
val a = new js.Array[String]
stores.foreach(s => a.push(s.name))
a
}
def interpretTxn[M <: TxnMode, A](txn: IDBTransaction, dsl: Txn[M, A]): AsyncCallback[A] =
AsyncCallback.suspend {
import TxnStep._
val stores = js.Dynamic.literal().asInstanceOf[js.Dictionary[IDBObjectStore]]
def getStore(s: ObjectStore[_, _]) =
AsyncCallback.delay(stores.get(s.defn.name).get)
def interpret[B](step: TxnStep[TxnMode, B]): AsyncCallback[B] = {
step match {
case FlatMap(fa, f) =>
interpret(fa).flatMap(a => interpret(f(a)))
case StoreGet(s, k) =>
getStore(s).flatMap { store =>
asyncRequest(store.get(k.asJs))(_.result).flatMapSync { result =>
if (js.isUndefined(result))
CallbackTo.pure(None)
else
s.defn.valueCodec.decode(result).map(Some(_))
}
}
case Eval(c) =>
c.asAsyncCallback
case Suspend(s) =>
s.asAsyncCallback.flatMap(interpret(_))
case GetStore(sd) =>
AsyncCallback.delay {
val s = txn.objectStore(sd.name)
stores.put(sd.name, s)
new ObjectStore(sd)
}
case StoreAdd(s, k, v) =>
getStore(s).flatMap { store =>
asyncRequest_(store.add(v, k.asJs))
}
case StorePut(s, k, v) =>
getStore(s).flatMap { store =>
asyncRequest_(store.put(v, k.asJs))
}
case Map(fa, f) =>
interpret(fa).map(f)
case StoreDelete(s, k) =>
getStore(s).flatMap { store =>
asyncRequest_(store.delete(k.asJs))
}
case StoreGetAllKeys(s) =>
import s.defn.keyCodec
getStore(s).flatMap { store =>
asyncRequest(store.getAllKeys()) { req =>
val rawKeys = req.result
Vector.tabulate(rawKeys.length) { i =>
val rawKey = rawKeys(i)
keyCodec.decode(IndexedDbKey.fromJs(rawKey)).runNow() // safe in asyncRequest onSuccess
}
}
}
case StoreGetAllVals(s) =>
import s.defn.valueCodec
getStore(s).flatMap { store =>
asyncRequest(store.getAll()) { req =>
val rawVals = req.result
Vector.tabulate(rawVals.length) { i =>
val rawVal = rawVals(i)
valueCodec.decode(rawVal).runNow() // safe in asyncRequest onSuccess
}
}
}
case StoreClear(s) =>
getStore(s).flatMap { store =>
asyncRequest_(store.clear())
}
case TailRec(z, f) =>
AsyncCallback.tailrec(z)(a => interpret(f(a)))
}
}
interpret(dsl.step)
}
} // object Internals
}