SPM support, platform concurrent execution.

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 0.0.1-beta.5 (2025-10-13)
+
+Added SPM support for iOS.
+Made plugin run proof generation on a concurrent background queue.
+
 ## 0.0.1-beta.4 (2025-06-09)
 
 Proof generation now works in background task queue.

android/build.gradle

@@ -2,14 +2,14 @@ group 'com.rapidsnark.flutter_rapidsnark'
 version '1.0-SNAPSHOT'
 
 buildscript {
-    ext.kotlin_version = '1.9.0'
+    ext.kotlin_version = '2.1.0'
     repositories {
         google()
         mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.3.0'
+        classpath 'com.android.tools.build:gradle:8.9.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }

android/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-bin.zip
 networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

android/src/main/kotlin/com/rapidsnark/flutter_rapidsnark/FlutterRapidsnarkPlugin.kt

@@ -7,21 +7,26 @@ import io.flutter.plugin.common.MethodChannel.Result
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.plugin.common.StandardMethodCodec
 import io.iden3.rapidsnark.*
+import java.util.concurrent.Executors
+import android.os.Handler
+import android.os.Looper
 
 /** FlutterRapidsnarkPlugin */
 class FlutterRapidsnarkPlugin : FlutterPlugin, MethodCallHandler {
-    /// The MethodChannel that will the communication between Flutter and native Android
-    ///
-    /// This local reference serves to register the plugin with the Flutter Engine and unregister it
-    /// when the Flutter Engine is detached from the Activity
     private lateinit var channel: MethodChannel
 
+    // Executor to allow multiple proving / verifying operations to run concurrently
+    private val executor = Executors.newCachedThreadPool()
+    private val mainHandler = Handler(Looper.getMainLooper())
+
     override fun onAttachedToEngine(flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
         val taskQueue = flutterPluginBinding.binaryMessenger.makeBackgroundTaskQueue()
-        channel = MethodChannel(flutterPluginBinding.binaryMessenger,
+        channel = MethodChannel(
+            flutterPluginBinding.binaryMessenger,
             "com.rapidsnark.flutter_rapidsnark",
             StandardMethodCodec.INSTANCE,
-            taskQueue)
+            taskQueue
+        )
         channel.setMethodCallHandler(this)
     }
 
@@ -36,6 +41,16 @@ class FlutterRapidsnarkPlugin : FlutterPlugin, MethodCallHandler {
 
     override fun onDetachedFromEngine(binding: FlutterPlugin.FlutterPluginBinding) {
         channel.setMethodCallHandler(null)
+        executor.shutdown()
+    }
+
+    // Helper to finish results safely on main thread
+    private fun complete(result: Result, block: () -> Unit) {
+        if (Looper.myLooper() == Looper.getMainLooper()) {
+            block()
+        } else {
+            mainHandler.post { block() }
+        }
     }
 
     private fun callGroth16Prove(call: MethodCall, result: Result) {
@@ -49,23 +64,33 @@ class FlutterRapidsnarkPlugin : FlutterPlugin, MethodCallHandler {
             val publicBufferSize = arguments["publicBufferSize"] as Int?
             val errorBufferSize = arguments["errorBufferSize"] as Int
 
-            // Call the heavy computation function
-            val proof = groth16Prove(
-                zkeyPath,
-                witnessBytes,
-                proofBufferSize,
-                publicBufferSize,
-                errorBufferSize,
-            )
-
-            result.success(
-                mapOf(
-                    "proof" to proof.proof,
-                    "publicSignals" to proof.publicSignals
-                )
-            )
+            // Dispatch heavy native call asynchronously to allow concurrency
+            executor.execute {
+                try {
+                    val proof = groth16Prove(
+                        zkeyPath,
+                        witnessBytes,
+                        proofBufferSize,
+                        publicBufferSize,
+                        errorBufferSize,
+                    )
+                    complete(result) {
+                        result.success(
+                            mapOf(
+                                "proof" to proof.proof,
+                                "publicSignals" to proof.publicSignals
+                            )
+                        )
+                    }
+                } catch (e: RapidsnarkProverError) {
+                    complete(result) { result.error("groth16Prove", e.message, null) }
+                } catch (e: Exception) {
+                    complete(result) { result.error("groth16Prove", e.message, null) }
+                }
+            }
         } catch (e: Exception) {
-            result.error("groth16ProveWithZKeyFilePath", e.message, null)
+            result.error("groth16Prove", "Failed to prove: ${e.message}", null)
+            return
         }
     }
 
@@ -74,17 +99,28 @@ class FlutterRapidsnarkPlugin : FlutterPlugin, MethodCallHandler {
             val arguments: Map<String, Any> = call.arguments<Map<String, Any>>()!!
 
             val zkeyPath = arguments["zkeyPath"] as String
-
             val errorBufferSize = arguments["errorBufferSize"] as Int
 
-            val publicSize = groth16PublicBufferSize(
-                zkeyPath,
-                errorBufferSize,
-            )
-
-            result.success(publicSize)
+            executor.execute {
+                try {
+                    val publicSize = groth16PublicBufferSize(
+                        zkeyPath,
+                        errorBufferSize,
+                    )
+                    complete(result) { result.success(publicSize) }
+                } catch (e: RapidsnarkProverError) {
+                    complete(result) { result.error("groth16PublicBufferSize", e.message, null) }
+                } catch (e: Exception) {
+                    complete(result) { result.error("groth16PublicBufferSize", e.message, null) }
+                }
+            }
         } catch (e: Exception) {
-            result.error("groth16PublicSizeForZkeyFile", e.message, null)
+            result.error(
+                "groth16PublicBufferSize",
+                "Failed to calculate public buffer size: ${e.message}",
+                null
+            )
+            return
         }
     }
 
@@ -98,16 +134,24 @@ class FlutterRapidsnarkPlugin : FlutterPlugin, MethodCallHandler {
 
             val errorBufferSize = arguments["errorBufferSize"] as Int
 
-            val isValid = groth16Verify(
-                proof,
-                inputs,
-                verificationKey,
-                errorBufferSize,
-            )
-
-            result.success(isValid)
+            executor.execute {
+                try {
+                    val isValid = groth16Verify(
+                        proof,
+                        inputs,
+                        verificationKey,
+                        errorBufferSize,
+                    )
+                    complete(result) { result.success(isValid) }
+                } catch (e: RapidsnarkVerifierError) {
+                    complete(result) { result.error("groth16Verify", e.message, null) }
+                } catch (e: Exception) {
+                    complete(result) { result.error("groth16Verify", e.message, null) }
+                }
+            }
         } catch (e: Exception) {
-            result.error("groth16Verify", e.message, null)
+            result.error("groth16Verify", "Invalid arguments type: ${e.message}", null)
+            return
         }
     }
 }

example/android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-bin.zip

example/android/settings.gradle

@@ -19,8 +19,8 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "8.2.1" apply false
-    id "org.jetbrains.kotlin.android" version "1.9.0" apply false
+    id "com.android.application" version "8.9.0" apply false
+    id "org.jetbrains.kotlin.android" version "2.1.0" apply false
 }
 
 include ":app"

example/ios/Flutter/AppFrameworkInfo.plist

@@ -21,6 +21,6 @@
   <key>CFBundleVersion</key>
   <string>1.0</string>
   <key>MinimumOSVersion</key>
-  <string>12.0</string>
+  <string>13.0</string>
 </dict>
 </plist>

example/ios/Podfile

@@ -1,5 +1,5 @@
 # Uncomment this line to define a global platform for your project
-platform :ios, '12.0'
+platform :ios, '13.0'
 
 # CocoaPods analytics sends network stats synchronously affecting flutter build latency.
 ENV['COCOAPODS_DISABLE_STATS'] = 'true'

example/ios/Podfile.lock

@@ -102,15 +102,15 @@ SPEC CHECKSUMS:
   DKImagePickerController: 946cec48c7873164274ecc4624d19e3da4c1ef3c
   DKPhotoGallery: b3834fecb755ee09a593d7c9e389d8b5d6deed60
   file_picker: 9b3292d7c8bc68c8a7bf8eb78f730e49c8efc517
-  Flutter: e0871f40cf51350855a761d2e70bf5af5b9b5de7
-  flutter_rapidsnark: 842c3ddde387254b6f8a36e1a0f403560ee169ca
+  Flutter: cabc95a1d2626b1b06e7179b784ebcf0c0cde467
+  flutter_rapidsnark: 943da7b717fd3435ce80d3422c64c12a0dd18be4
   integration_test: 4a889634ef21a45d28d50d622cf412dc6d9f586e
   path_provider_foundation: 080d55be775b7414fd5a5ef3ac137b97b097e564
   rapidsnark: da1c1d74a36ba8376700286d45707574d9d1afcb
   SDWebImage: f84b0feeb08d2d11e6a9b843cb06d75ebf5b8868
   share_plus: 50da8cb520a8f0f65671c6c6a99b3617ed10a58a
   SwiftyGif: 706c60cf65fa2bc5ee0313beece843c8eb8194d4
 
-PODFILE CHECKSUM: 095d9af8b13ecba9b7619a234542d1b32779cac5
+PODFILE CHECKSUM: 92906b04914919e75004799b609448ddd7c0a72e
 
 COCOAPODS: 1.16.2