Swift Driver Additions #262
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| package com.powersync | ||
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| import androidx.sqlite.SQLiteStatement | ||
| import cnames.structs.sqlite3 | ||
| import co.touchlab.kermit.Logger | ||
| import com.powersync.db.driver.SQLiteConnectionLease | ||
| import com.powersync.db.driver.SQLiteConnectionPool | ||
| import com.powersync.db.schema.Schema | ||
| import com.powersync.sqlite.Database | ||
| import io.ktor.utils.io.CancellationException | ||
| import kotlinx.cinterop.CPointer | ||
| import kotlinx.cinterop.ExperimentalForeignApi | ||
| import kotlinx.coroutines.DelicateCoroutinesApi | ||
| import kotlinx.coroutines.GlobalScope | ||
| import kotlinx.coroutines.flow.MutableSharedFlow | ||
| import kotlinx.coroutines.flow.SharedFlow | ||
| import kotlinx.coroutines.runBlocking | ||
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| @OptIn(ExperimentalPowerSyncAPI::class) | ||
| internal class RawConnectionLease | ||
| @OptIn(ExperimentalForeignApi::class) | ||
| constructor( | ||
| connectionPointer: CPointer<sqlite3>, | ||
| ) : SQLiteConnectionLease { | ||
| private var isCompleted = false | ||
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| @OptIn(ExperimentalForeignApi::class) | ||
| private var db = Database(connectionPointer) | ||
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| private fun checkNotCompleted() { | ||
| check(!isCompleted) { "Connection lease already closed" } | ||
| } | ||
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| override suspend fun isInTransaction(): Boolean = isInTransactionSync() | ||
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| override fun isInTransactionSync(): Boolean { | ||
| checkNotCompleted() | ||
| return db.inTransaction() | ||
| } | ||
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| override suspend fun <R> usePrepared( | ||
| sql: String, | ||
| block: (SQLiteStatement) -> R, | ||
| ): R = usePreparedSync(sql, block) | ||
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| override fun <R> usePreparedSync( | ||
| sql: String, | ||
| block: (SQLiteStatement) -> R, | ||
| ): R { | ||
| checkNotCompleted() | ||
| return db.prepare(sql).use(block) | ||
| } | ||
| } | ||
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| /** | ||
| * We only allow synchronous callbacks on the Swift side for leased READ/WRITE connections. | ||
| * We also get a SQLite connection pointer (sqlite3*) from Swift side. which is used in a [Database] | ||
| */ | ||
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| public interface SwiftPoolAdapter { | ||
| @OptIn(ExperimentalForeignApi::class) | ||
| @Throws(PowerSyncException::class, CancellationException::class) | ||
| public suspend fun leaseRead(callback: (CPointer<sqlite3>) -> Unit) | ||
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| @OptIn(ExperimentalForeignApi::class) | ||
| @Throws(PowerSyncException::class, CancellationException::class) | ||
| public suspend fun leaseWrite(callback: (CPointer<sqlite3>) -> Unit) | ||
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| @OptIn(ExperimentalForeignApi::class) | ||
| @Throws(PowerSyncException::class, CancellationException::class) | ||
| public suspend fun leaseAll(callback: (CPointer<sqlite3>, List<CPointer<sqlite3>>) -> Unit) | ||
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| public suspend fun closePool() | ||
| } | ||
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| @OptIn(ExperimentalPowerSyncAPI::class) | ||
| public open class SwiftSQLiteConnectionPool | ||
| @OptIn(ExperimentalForeignApi::class) | ||
| constructor( | ||
| private val adapter: SwiftPoolAdapter, | ||
| ) : SQLiteConnectionPool { | ||
| private val _updates = MutableSharedFlow<Set<String>>(replay = 0) | ||
| override val updates: SharedFlow<Set<String>> get() = _updates | ||
|
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| public fun pushUpdate(update: Set<String>) { | ||
| _updates.tryEmit(update) | ||
| } | ||
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| @OptIn(ExperimentalForeignApi::class) | ||
| override suspend fun <T> read(callback: suspend (SQLiteConnectionLease) -> T): T { | ||
| var result: T? = null | ||
| adapter.leaseRead { | ||
| /** | ||
| * For GRDB, this should be running inside the callback | ||
| * ```swift | ||
| * db.write { | ||
| * // should be here | ||
| * } | ||
| * ``` | ||
| */ | ||
| val lease = RawConnectionLease(it) | ||
| runBlocking { | ||
| result = callback(lease) | ||
| } | ||
| } | ||
| return result as T | ||
| } | ||
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| @OptIn(ExperimentalForeignApi::class) | ||
| override suspend fun <T> write(callback: suspend (SQLiteConnectionLease) -> T): T { | ||
| var result: T? = null | ||
| adapter.leaseWrite { | ||
| val lease = RawConnectionLease(it) | ||
| runBlocking { | ||
| result = callback(lease) | ||
| } | ||
| } | ||
| return result as T | ||
| } | ||
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| @OptIn(ExperimentalForeignApi::class) | ||
| override suspend fun <R> withAllConnections(action: suspend (SQLiteConnectionLease, List<SQLiteConnectionLease>) -> R) { | ||
| adapter.leaseAll { writerPtr, readerPtrs -> | ||
| runBlocking { | ||
| action(RawConnectionLease(writerPtr), readerPtrs.map { RawConnectionLease(it) }) | ||
| } | ||
| } | ||
| } | ||
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| override suspend fun close() { | ||
| adapter.closePool() | ||
| } | ||
| } | ||
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| @OptIn(ExperimentalPowerSyncAPI::class, DelicateCoroutinesApi::class) | ||
| public fun openPowerSyncWithPool( | ||
| pool: SQLiteConnectionPool, | ||
| identifier: String, | ||
| schema: Schema, | ||
| logger: Logger, | ||
| ): PowerSyncDatabase = | ||
| PowerSyncDatabase.opened( | ||
| pool = pool, | ||
| scope = GlobalScope, | ||
| schema = schema, | ||
| identifier = identifier, | ||
| logger = logger, | ||
| ) | ||
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Since it looks like we wouldn't extend this class from Swift, I don't think it would have to be
open?