Merge pull request #353 from gotify/concurrent-image-access

fix: image loading when using markdown img and bigImageUrl

app/src/main/kotlin/com/github/gotify/CoilInstance.kt

@@ -16,13 +16,62 @@ import java.io.IOException
 import okhttp3.OkHttpClient
 import org.tinylog.kotlin.Logger
 
-internal class CoilHandler(private val context: Context, private val settings: Settings) {
-    private val imageLoader = makeImageLoader()
+object CoilInstance {
+    private var holder: Pair<SSLSettings, ImageLoader>? = null
 
-    private fun makeImageLoader(): ImageLoader {
+    @Throws(IOException::class)
+    fun getImageFromUrl(context: Context, url: String?): Bitmap {
+        val request = ImageRequest.Builder(context)
+            .data(url)
+            .build()
+        return (get(context).executeBlocking(request).drawable as BitmapDrawable).bitmap
+    }
+
+    fun getIcon(context: Context, app: Application?): Bitmap {
+        if (app == null) {
+            return BitmapFactory.decodeResource(context.resources, R.drawable.gotify)
+        }
+        val baseUrl = Settings(context).url
+        try {
+            return getImageFromUrl(
+                context,
+                Utils.resolveAbsoluteUrl("$baseUrl/", app.image)
+            )
+        } catch (e: IOException) {
+            Logger.error(e, "Could not load image for notification")
+        }
+        return BitmapFactory.decodeResource(context.resources, R.drawable.gotify)
+    }
+
+    @OptIn(ExperimentalCoilApi::class)
+    fun evict(context: Context) {
+        try {
+            get(context).apply {
+                diskCache?.clear()
+                memoryCache?.clear()
+            }
+        } catch (e: IOException) {
+            Logger.error(e, "Problem evicting Coil cache")
+        }
+    }
+
+    @Synchronized
+    fun get(context: Context): ImageLoader {
+        val newSettings = Settings(context).sslSettings()
+        val copy = holder
+        if (copy != null && copy.first == newSettings) {
+            return copy.second
+        }
+        return makeImageLoader(context, newSettings).also { holder = it }.second
+    }
+
+    private fun makeImageLoader(
+        context: Context,
+        sslSettings: SSLSettings
+    ): Pair<SSLSettings, ImageLoader> {
         val builder = OkHttpClient.Builder()
-        CertUtils.applySslSettings(builder, settings.sslSettings())
-        return ImageLoader.Builder(context)
+        CertUtils.applySslSettings(builder, sslSettings)
+        val loader = ImageLoader.Builder(context)
             .okHttpClient(builder.build())
             .diskCache {
                 DiskCache.Builder()
@@ -33,39 +82,6 @@ internal class CoilHandler(private val context: Context, private val settings: S
                 add(SvgDecoder.Factory())
             }
             .build()
-    }
-
-    @Throws(IOException::class)
-    fun getImageFromUrl(url: String?): Bitmap {
-        val request = ImageRequest.Builder(context)
-            .data(url)
-            .build()
-        return (imageLoader.executeBlocking(request).drawable as BitmapDrawable).bitmap
-    }
-
-    fun getIcon(app: Application?): Bitmap {
-        if (app == null) {
-            return BitmapFactory.decodeResource(context.resources, R.drawable.gotify)
-        }
-        try {
-            return getImageFromUrl(
-                Utils.resolveAbsoluteUrl("${settings.url}/", app.image)
-            )
-        } catch (e: IOException) {
-            Logger.error(e, "Could not load image for notification")
-        }
-        return BitmapFactory.decodeResource(context.resources, R.drawable.gotify)
-    }
-
-    fun get() = imageLoader
-
-    @OptIn(ExperimentalCoilApi::class)
-    fun evict() {
-        try {
-            imageLoader.diskCache?.clear()
-            imageLoader.memoryCache?.clear()
-        } catch (e: IOException) {
-            Logger.error(e, "Problem evicting Coil cache")
-        }
+        return sslSettings to loader
     }
 }

app/src/main/kotlin/com/github/gotify/SSLSettings.kt

@@ -1,6 +1,6 @@
 package com.github.gotify
 
-internal class SSLSettings(
+internal data class SSLSettings(
     val validateSSL: Boolean,
     val caCertPath: String?,
     val clientCertPath: String?,

app/src/main/kotlin/com/github/gotify/messages/MessagesActivity.kt

@@ -31,6 +31,7 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import coil.request.ImageRequest
 import com.github.gotify.BuildConfig
+import com.github.gotify.CoilInstance
 import com.github.gotify.MissedMessageUtil
 import com.github.gotify.R
 import com.github.gotify.Utils
@@ -102,7 +103,7 @@ internal class MessagesActivity :
         listMessageAdapter = ListMessageAdapter(
             this,
             viewModel.settings,
-            viewModel.coilHandler.get()
+            CoilInstance.get(this)
         ) { message ->
             scheduleDeletion(message)
         }
@@ -169,13 +170,13 @@ internal class MessagesActivity :
     }
 
     private fun refreshAll() {
-        viewModel.coilHandler.evict()
+        CoilInstance.evict(this)
         startActivity(Intent(this, InitializationActivity::class.java))
         finish()
     }
 
     private fun onRefresh() {
-        viewModel.coilHandler.evict()
+        CoilInstance.evict(this)
         viewModel.messages.clear()
         launchCoroutine {
             loadMore(viewModel.appId).forEachIndexed { index, message ->
@@ -211,9 +212,7 @@ internal class MessagesActivity :
                 .size(100, 100)
                 .target(t)
                 .build()
-            viewModel.coilHandler
-                .get()
-                .enqueue(request)
+            CoilInstance.get(this).enqueue(request)
         }
         selectAppInMenu(selectedItem)
     }

app/src/main/kotlin/com/github/gotify/messages/MessagesModel.kt

@@ -3,7 +3,6 @@ package com.github.gotify.messages
 import android.app.Activity
 import androidx.lifecycle.ViewModel
 import coil.target.Target
-import com.github.gotify.CoilHandler
 import com.github.gotify.Settings
 import com.github.gotify.api.ClientFactory
 import com.github.gotify.client.api.MessageApi
@@ -13,7 +12,6 @@ import com.github.gotify.messages.provider.MessageState
 
 internal class MessagesModel(parentView: Activity) : ViewModel() {
     val settings = Settings(parentView)
-    val coilHandler = CoilHandler(parentView, settings)
     val client = ClientFactory.clientToken(settings)
     val appsHolder = ApplicationHolder(parentView, client)
     val messages = MessageFacade(client.createService(MessageApi::class.java), appsHolder)

app/src/main/kotlin/com/github/gotify/service/WebSocketService.kt

@@ -17,7 +17,7 @@ import androidx.annotation.RequiresApi
 import androidx.core.app.NotificationCompat
 import androidx.core.content.ContextCompat
 import com.github.gotify.BuildConfig
-import com.github.gotify.CoilHandler
+import com.github.gotify.CoilInstance
 import com.github.gotify.MarkwonFactory
 import com.github.gotify.MissedMessageUtil
 import com.github.gotify.NotificationSupport
@@ -62,7 +62,6 @@ internal class WebSocketService : Service() {
     private val lastReceivedMessage = AtomicLong(NOT_LOADED)
     private lateinit var missingMessageUtil: MissedMessageUtil
 
-    private lateinit var coilHandler: CoilHandler
     private lateinit var markwon: Markwon
 
     override fun onCreate() {
@@ -71,8 +70,7 @@ internal class WebSocketService : Service() {
         val client = ClientFactory.clientToken(settings)
         missingMessageUtil = MissedMessageUtil(client.createService(MessageApi::class.java))
         Logger.info("Create ${javaClass.simpleName}")
-        coilHandler = CoilHandler(this, settings)
-        markwon = MarkwonFactory.createForNotification(this, coilHandler.get())
+        markwon = MarkwonFactory.createForNotification(this, CoilInstance.get(this))
     }
 
     override fun onDestroy() {
@@ -377,7 +375,7 @@ internal class WebSocketService : Service() {
             .setDefaults(Notification.DEFAULT_ALL)
             .setWhen(System.currentTimeMillis())
             .setSmallIcon(R.drawable.ic_gotify)
-            .setLargeIcon(coilHandler.getIcon(appIdToApp[appId]))
+            .setLargeIcon(CoilInstance.getIcon(this, appIdToApp[appId]))
             .setTicker("${getString(R.string.app_name)} - $title")
             .setGroup(NotificationSupport.Group.MESSAGES)
             .setContentTitle(title)
@@ -406,7 +404,7 @@ internal class WebSocketService : Service() {
             try {
                 b.setStyle(
                     NotificationCompat.BigPictureStyle()
-                        .bigPicture(coilHandler.getImageFromUrl(notificationImageUrl))
+                        .bigPicture(CoilInstance.getImageFromUrl(this, notificationImageUrl))
                 )
             } catch (e: Exception) {
                 Logger.error(e, "Error loading bigImageUrl")