Fix race condition where not all logs would be added to the viewer.

app/src/main/java/org/thoughtcrime/securesms/logsubmit/SubmitDebugLogActivity.java

@@ -27,7 +27,7 @@ import androidx.lifecycle.ViewModelProvider;
 
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 
-import org.signal.core.util.concurrent.SignalExecutors;
+import org.signal.core.util.ThreadUtil;
 import org.signal.debuglogsviewer.DebugLogsViewer;
 import org.thoughtcrime.securesms.BaseActivity;
 import org.thoughtcrime.securesms.R;
@@ -44,9 +44,9 @@ import org.thoughtcrime.securesms.util.views.CircularProgressMaterialButton;
 import java.util.ArrayList;
 import java.util.List;
 
-import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
 import io.reactivex.rxjava3.disposables.CompositeDisposable;
 import io.reactivex.rxjava3.disposables.Disposable;
+import io.reactivex.rxjava3.schedulers.Schedulers;
 
 public class SubmitDebugLogActivity extends BaseActivity {
 
@@ -346,19 +346,22 @@ public class SubmitDebugLogActivity extends BaseActivity {
 
   private void subscribeToLogLines() {
     Disposable disposable = viewModel.getLogLinesObservable()
-        .observeOn(AndroidSchedulers.mainThread())
-        .subscribe(this::presentLines, throwable -> {
+        .observeOn(Schedulers.io())
+        .subscribe(this::appendLines, throwable -> {
           // Handle error
+          ThreadUtil.runOnMain(() -> {
             this.progressCard.setVisibility(View.GONE);
           });
+        });
     disposables.add(disposable);
   }
 
-  private void presentLines(@NonNull List<String> lines) {
+  private void appendLines(@NonNull List<String> lines) {
+    ThreadUtil.runOnMain(() -> {
       warningBanner.setVisibility(View.VISIBLE);
       submitButton.setVisibility(View.VISIBLE);
+    });
 
-    SignalExecutors.BOUNDED.execute(() -> {
     StringBuilder lineBuilder = new StringBuilder();
 
     for (String line : lines) {
@@ -366,7 +369,6 @@ public class SubmitDebugLogActivity extends BaseActivity {
     }
 
     DebugLogsViewer.appendLines(logWebView, lineBuilder.toString());
-    });
   }
 
   private void presentMode(@NonNull SubmitDebugLogViewModel.Mode mode) {

debuglogs-viewer/lib/src/main/assets/debuglogs-viewer.js

@@ -220,6 +220,11 @@ function applyFilter() {
   editor.setValue(filtered, -1);
 }
 
+function appendLines(lines) {
+  editor.session.insert({ row: editor.session.getLength(), column: 0}, lines);
+  logLines += lines;
+}
+
 function readLines(offset, limit) {
   const lines = logLines.split("\n")
   if (offset >= lines.length) {

debuglogs-viewer/lib/src/main/java/org/signal/debuglogsviewer/DebugLogsViewer.kt

@@ -46,7 +46,11 @@ object DebugLogsViewer {
   fun appendLines(webview: WebView, lines: String) {
     // Set the debug log lines
     val escaped = JSONObject.quote(lines)
-    ThreadUtil.runOnMain { webview.evaluateJavascript("editor.insert($escaped); logLines+=$escaped;", null) }
+    val latch = CountDownLatch(1)
+    ThreadUtil.runOnMain {
+      webview.evaluateJavascript("appendLines($escaped)") { latch.countDown() }
+    }
+    latch.await()
   }
 
   @JvmStatic