chore: improve error handling for kotlin errors (#20)

* chore: improve error handling for kotlin errors

* chore: add red dot

Author: DominicGBauer

CHANGELOG.md

@@ -1,6 +1,13 @@
 # Changelog
 
+## 1.0.0-Beta.5
+
+* Implement improvements to errors originating in Kotlin so that they can be handled in Swift
+* Improve `__fetchCredentials`to log the error but not cause an app crash on error
+
+
 ## 1.0.0-Beta.4
+
 * Allow cursor to use column name to get value by including the following functions that accept a column name parameter:
 `getBoolean`,`getBooleanOptional`,`getString`,`getStringOptional`, `getLong`,`getLongOptional`, `getDouble`,`getDoubleOptional`
 * BREAKING CHANGE: This should not affect anyone but made `KotlinPowerSyncCredentials`, `KotlinPowerSyncDatabase` and `KotlinPowerSyncBackendConnector` private as these should never have been public.

Demo/PowerSyncExample.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -15,8 +15,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/powersync-ja/powersync-kotlin.git",
       "state" : {
-        "revision" : "7cd47ffc9dbec8fae4f9e067945ef2279015a90d",
-        "version" : "1.0.0-BETA20.0"
+        "revision" : "61d195816585f30260181dcbd157bf1660c9ac4e",
+        "version" : "1.0.0-BETA22.0"
       }
     },
     {

Demo/PowerSyncExample/PowerSync/SupabaseConnector.swift

@@ -70,13 +70,13 @@ class SupabaseConnector: PowerSyncBackendConnector {
 
     override func fetchCredentials() async throws -> PowerSyncCredentials? {
         session = try await client.auth.session
-
+        
         if (self.session == nil) {
             throw AuthError.sessionMissing
         }
-
+        
         let token = session!.accessToken
-
+        
         // userId is for debugging purposes only
         return PowerSyncCredentials(endpoint: self.powerSyncEndpoint, token: token, userId: currentUserID)
     }

Package.resolved

@@ -5,8 +5,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/powersync-ja/powersync-kotlin.git",
       "state" : {
-        "revision" : "7cd47ffc9dbec8fae4f9e067945ef2279015a90d",
-        "version" : "1.0.0-BETA20.0"
+        "revision" : "61d195816585f30260181dcbd157bf1660c9ac4e",
+        "version" : "1.0.0-BETA22.0"
       }
     },
     {

Package.swift

@@ -16,7 +16,7 @@ let package = Package(
             targets: ["PowerSync"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/powersync-ja/powersync-kotlin.git", exact: "1.0.0-BETA20.0"),
+        .package(url: "https://github.com/powersync-ja/powersync-kotlin.git", exact: "1.0.0-BETA22.0"),
         .package(url: "https://github.com/powersync-ja/powersync-sqlite-core-swift.git", "0.3.9"..<"0.4.0")
     ],
     targets: [

Sources/PowerSync/Kotlin/KotlinPowerSyncDatabaseImpl.swift

@@ -153,7 +153,7 @@ final class KotlinPowerSyncDatabaseImpl: PowerSyncDatabaseProtocol {
     ) -> AsyncStream<[RowType]> {
         AsyncStream { continuation in
             Task {
-                for await values in self.kotlinDatabase.watch(
+                for await values in try self.kotlinDatabase.watch(
                     sql: sql,
                     parameters: parameters,
                     mapper: mapper
@@ -172,7 +172,7 @@ final class KotlinPowerSyncDatabaseImpl: PowerSyncDatabaseProtocol {
     ) -> AsyncStream<[RowType]> {
         AsyncStream { continuation in
             Task {
-                for await values in self.kotlinDatabase.watch(
+                for await values in try self.kotlinDatabase.watch(
                     sql: sql,
                     parameters: parameters,
                     mapper: { cursor in

Sources/PowerSync/Kotlin/SqlCursor.swift

@@ -8,60 +8,60 @@ extension SqlCursor {
         }
         return columnIndex
     }
-    
-    private func getValue<T>(name: String, getter: (Int32) -> T?) throws -> T {
+
+    private func getValue<T>(name: String, getter: (Int32) throws -> T?) throws -> T {
         let columnIndex = try getColumnIndex(name: name)
-        guard let value = getter(columnIndex) else {
+        guard let value = try getter(columnIndex) else {
             throw SqlCursorError.nullValueFound(name)
         }
         return value
     }
-    
-    private func getOptionalValue<T>(name: String, getter: (String) -> T?) throws -> T? {
+
+    private func getOptionalValue<T>(name: String, getter: (String) throws -> T?) throws -> T? {
         _ = try getColumnIndex(name: name)
-        return getter(name)
+        return try getter(name)
     }
-    
+
     public func getBoolean(name: String) throws -> Bool {
         try getValue(name: name) { getBoolean(index: $0)?.boolValue }
     }
-    
+
     public func getDouble(name: String) throws -> Double {
         try getValue(name: name) { getDouble(index: $0)?.doubleValue }
     }
-    
+
     public func getLong(name: String) throws -> Int {
         try getValue(name: name) { getLong(index: $0)?.intValue }
     }
-    
+
     public func getString(name: String) throws -> String {
         try getValue(name: name) { getString(index: $0) }
     }
-    
+
     public func getBooleanOptional(name: String) throws -> Bool? {
-        try getOptionalValue(name: name) { getBooleanOptional(name: $0)?.boolValue }
+        try getOptionalValue(name: name) { try getBooleanOptional(name: $0)?.boolValue }
     }
-    
+
     public func getDoubleOptional(name: String) throws -> Double? {
-        try getOptionalValue(name: name) { getDoubleOptional(name: $0)?.doubleValue }
+        try getOptionalValue(name: name) { try getDoubleOptional(name: $0)?.doubleValue }
     }
-    
+
     public func getLongOptional(name: String) throws -> Int? {
-        try getOptionalValue(name: name) { getLongOptional(name: $0)?.intValue }
+        try getOptionalValue(name: name) { try getLongOptional(name: $0)?.intValue }
     }
-    
+
     public func getStringOptional(name: String) throws -> String? {
-        try getOptionalValue(name: name) { PowerSyncKotlin.SqlCursorKt.getStringOptional(self, name: $0) }
+        try getOptionalValue(name: name) { try PowerSyncKotlin.SqlCursorKt.getStringOptional(self, name: $0) }
     }
 }
 
 enum SqlCursorError: Error {
     case nullValue(message: String)
-    
+
     static func columnNotFound(_ name: String) -> SqlCursorError {
         .nullValue(message: "Column '\(name)' not found")
     }
-    
+
     static func nullValueFound(_ name: String) -> SqlCursorError {
         .nullValue(message: "Null value found for column \(name)")
     }

Sources/PowerSync/PowerSyncBackendConnectorAdapter.swift

@@ -1,3 +1,5 @@
+import OSLog
+
 class PowerSyncBackendConnectorAdapter: KotlinPowerSyncBackendConnector {
     let swiftBackendConnector: PowerSyncBackendConnector
 
@@ -8,11 +10,29 @@ class PowerSyncBackendConnectorAdapter: KotlinPowerSyncBackendConnector {
     }
 
     override func __fetchCredentials() async throws -> KotlinPowerSyncCredentials? {
-        try await swiftBackendConnector.fetchCredentials()?.kotlinCredentials
+        do {
+            let result = try await swiftBackendConnector.fetchCredentials()
+            return result?.kotlinCredentials
+        } catch {
+            if #available(iOS 14.0, *) {
+                Logger().error("🔴 Failed to fetch credentials: \(error.localizedDescription)")
+            } else {
+                print("🔴 Failed to fetch credentials: \(error.localizedDescription)")
+            }
+            return nil
+        }
     }
 
     override func __uploadData(database: KotlinPowerSyncDatabase) async throws {
         let swiftDatabase = KotlinPowerSyncDatabaseImpl(kotlinDatabase: database)
-        try await swiftBackendConnector.uploadData(database: swiftDatabase)
+        do {
+            return  try await swiftBackendConnector.uploadData(database: swiftDatabase)
+        } catch {
+            if #available(iOS 14.0, *) {
+                Logger().error("🔴 Failed to upload data: \(error)")
+            } else {
+                print("🔴 Failed to upload data: \(error)")
+            }
+        }
     }
 }