Send crash notification when flipper cpp exceptions are suppressed

Summary: This diff adds support to send crash notification whenever the cpp exception of Flipper is suppressed. Also updated the tests regarding the same

Reviewed By: jknoxville

Differential Revision: D13635822

fbshipit-source-id: 01e4a57c391476e5b044e64946d337cb4582a527

xplat/Flipper/Flipper.podspec

@@ -9,8 +9,8 @@ Pod::Spec.new do |spec|
   spec.source = { :git => 'https://github.com/facebook/Sonar.git',
                   :tag => 'v'+flipperkit_version }
   spec.module_name = 'Flipper'
-  spec.public_header_files = 'xplat/Flipper/*.h'
-  spec.source_files = 'xplat/Flipper/*.{h,cpp,m,mm}'
+  spec.public_header_files = 'xplat/Flipper/*.h','xplat/utils/*.h'
+  spec.source_files = 'xplat/Flipper/*.{h,cpp,m,mm}','xplat/Flipper/utils/*.{h,cpp,m,mm}'
   spec.libraries = "stdc++"
   spec.dependency 'Folly', '~>1.1'
   spec.dependency 'RSocket', '~>0.10'

xplat/Flipper/FlipperClient.cpp

@@ -1,9 +1,8 @@
-/*
- *  Copyright (c) Facebook, Inc.
- *
- *  This source code is licensed under the MIT license found in the LICENSE
- *  file in the root directory of this source tree.
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
  *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
  */
 #include "FlipperClient.h"
 #include <fstream>
@@ -17,6 +16,12 @@
 #include "FlipperState.h"
 #include "FlipperStep.h"
 #include "Log.h"
+#if __ANDROID__
+#include "utils/CallstackHelper.h"
+#endif
+#if __APPLE__
+#include <execinfo.h>
+#endif
 
 #if FB_SONARKIT_ENABLED
 
@@ -222,6 +227,31 @@ void FlipperClient::onMessageReceived(const dynamic& message) {
     responder->error(response);
   });
 }
+std::string FlipperClient::callstack() {
+#if __APPLE__
+  // For some iOS apps, __Unwind_Backtrace symbol wasn't found in sandcastle
+  // builds, thus, for iOS apps, using backtrace c function.
+  void* callstack[2048];
+  int frames = backtrace(callstack, 2048);
+  char** strs = backtrace_symbols(callstack, frames);
+  std::string output = "";
+  for (int i = 0; i < frames; ++i) {
+    output.append(strs[i]);
+    output.append("\n");
+  }
+  return output;
+#elif __ANDROID__
+  const size_t max = 2048;
+  void* buffer[max];
+  std::ostringstream oss;
+
+  dumpBacktrace(oss, buffer, captureBacktrace(buffer, max));
+  std::string output = std::string(oss.str().c_str());
+  return output;
+#else
+  return "";
+#endif
+}
 void FlipperClient::performAndReportError(const std::function<void()>& func) {
 #if FLIPPER_ENABLE_CRASH
   // To debug the stack trace and an exception turn on the compiler flag
@@ -231,9 +261,12 @@ void FlipperClient::performAndReportError(const std::function<void()>& func) {
   try {
     func();
   } catch (std::exception& e) {
-    dynamic message = dynamic::object(
-        "error", dynamic::object("message", e.what())("stacktrace", "<none>"));
     if (connected_) {
+      std::string callstack = this->callstack();
+      dynamic message = dynamic::object(
+          "error",
+          dynamic::object("message", e.what())("stacktrace", callstack)(
+              "name", e.what()));
       socket_->sendMessage(message);
     } else {
       log("Error: " + std::string(e.what()));

xplat/Flipper/FlipperClient.h

@@ -1,9 +1,8 @@
-/*
- *  Copyright (c) Facebook, Inc.
- *
- *  This source code is licensed under the MIT license found in the LICENSE
- *  file in the root directory of this source tree.
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
  *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
  */
 #pragma once
 
@@ -46,6 +45,9 @@ class FlipperClient : public FlipperConnectionManager::Callbacks {
       : socket_(std::move(socket)), flipperState_(state) {
     auto step = flipperState_->start("Create client");
     socket_->setCallbacks(this);
+    auto& conn = connections_["flipper-crash-report"];
+    conn = std::make_shared<FlipperConnectionImpl>(
+        socket_.get(), "flipper-crash-report");
     step->complete();
   }
 
@@ -105,6 +107,7 @@ class FlipperClient : public FlipperConnectionManager::Callbacks {
 
   void disconnect(std::shared_ptr<FlipperPlugin> plugin);
   void startBackgroundPlugins();
+  std::string callstack();
 };
 
 } // namespace flipper

xplat/Flipper/utils/CallstackHelper.h

@@ -0,0 +1,63 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ */
+#if FB_SONARKIT_ENABLED
+
+#include <dlfcn.h>
+#include <unwind.h>
+#include <iomanip>
+
+namespace facebook {
+namespace flipper {
+// TODO: T39093653, Replace the backtrace implementation with folly
+// implementation. Didn't use the backtrace() c function as it was not found in
+// NDK.
+struct BacktraceState {
+  void** current;
+  void** end;
+};
+
+static _Unwind_Reason_Code unwindCallback(
+    struct _Unwind_Context* context,
+    void* arg) {
+  BacktraceState* state = static_cast<BacktraceState*>(arg);
+  uintptr_t pc = _Unwind_GetIP(context);
+  if (pc) {
+    if (state->current == state->end) {
+      return _URC_END_OF_STACK;
+    } else {
+      *state->current++ = reinterpret_cast<void*>(pc);
+    }
+  }
+  return _URC_NO_REASON;
+}
+
+static size_t captureBacktrace(void** buffer, size_t max) {
+  BacktraceState state = {buffer, buffer + max};
+  _Unwind_Backtrace(unwindCallback, &state);
+
+  return state.current - buffer;
+}
+
+static void dumpBacktrace(std::ostream& os, void** buffer, size_t count) {
+  for (size_t idx = 0; idx < count; ++idx) {
+    const void* addr = buffer[idx];
+    const char* symbol = "";
+
+    Dl_info info;
+    if (dladdr(addr, &info) && info.dli_sname) {
+      symbol = info.dli_sname;
+    }
+
+    os << "  #" << std::setw(2) << idx << ": " << addr << "  " << symbol
+       << "\n";
+  }
+}
+
+} // namespace flipper
+} // namespace facebook
+
+#endif

xplat/FlipperTests/FlipperClientTests.cpp

@@ -1,9 +1,8 @@
-/*
- *  Copyright (c) Facebook, Inc.
- *
- *  This source code is licensed under the MIT license found in the LICENSE
- *  file in the root directory of this source tree.
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
  *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
  */
 #include <Flipper/FlipperClient.h>
 #include <FlipperTestLib/FlipperConnectionManagerMock.h>
@@ -282,10 +281,12 @@ TEST(FlipperClientTests, testExceptionUnknownPlugin) {
   dynamic messageInit = dynamic::object("method", "init")(
       "params", dynamic::object("plugin", "Unknown"));
   socket->callbacks->onMessageReceived(messageInit);
-
   EXPECT_EQ(
       socket->messages.back()["error"]["message"],
       "plugin Unknown not found for method init");
+  EXPECT_EQ(
+      socket->messages.back()["error"]["name"],
+      "plugin Unknown not found for method init");
 }
 
 TEST(FlipperClientTests, testExceptionUnknownApi) {
@@ -297,10 +298,12 @@ TEST(FlipperClientTests, testExceptionUnknownApi) {
   dynamic messageInit = dynamic::object("method", "execute")(
       "params", dynamic::object("api", "Unknown"));
   socket->callbacks->onMessageReceived(messageInit);
-
   EXPECT_EQ(
       socket->messages.back()["error"]["message"],
       "connection Unknown not found for method execute");
+  EXPECT_EQ(
+      socket->messages.back()["error"]["name"],
+      "connection Unknown not found for method execute");
 }
 
 TEST(FlipperClientTests, testBackgroundPluginActivated) {