Initialize glog in react native.

Reviewed By: mhorowitz

Differential Revision: D2967180

fb-gh-sync-id: fe59b7f7c7dab8b5e7f3a449e72b467e1c2c2c67
shipit-source-id: fe59b7f7c7dab8b5e7f3a449e72b467e1c2c2c67

ReactAndroid/DEFS

@@ -6,7 +6,6 @@
 
 import os
 
-
 # Example: react_native_target('java/com/facebook/react/common:common')
 def react_native_target(path):
   return '//ReactAndroid/src/main/' + path
@@ -34,6 +33,8 @@ JSC_INTERNAL_DEPS = [
   '//native/third-party/jsc-internal:jsc_legacy_profiler',
 ]
 
+FBGLOGINIT_TARGET = '//ReactAndroid/src/main/jni/first-party/fbgloginit:fbgloginit'
+
 INTERNAL_APP = 'PUBLIC'
 
 # React property preprocessor
@@ -96,4 +97,4 @@ def robolectric3_test(name, deps, vm_args=None, *args, **kwargs):
     vm_args=vm_args + extra_vm_args,
     *args,
     **kwargs
-  )
+  )

ReactAndroid/src/main/jni/first-party/fbgloginit/Android.mk

@@ -0,0 +1,24 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+       glog_init.cpp
+
+LOCAL_C_INCLUDES := $(LOCAL_PATH)
+LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)
+
+LOCAL_CFLAGS := -fexceptions -fno-omit-frame-pointer
+LOCAL_CFLAGS += -Wall -Werror
+
+CXX11_FLAGS := -std=gnu++11
+LOCAL_CFLAGS += $(CXX11_FLAGS)
+
+LOCAL_EXPORT_CPPFLAGS := $(CXX11_FLAGS)
+
+LOCAL_LDLIBS := -llog
+
+LOCAL_SHARED_LIBRARIES := libglog
+
+LOCAL_MODULE := libglog_init
+
+include $(BUILD_SHARED_LIBRARY)

ReactAndroid/src/main/jni/first-party/fbgloginit/BUCK

@@ -0,0 +1,20 @@
+cxx_library(
+  name = 'fbgloginit',
+  force_static = True,
+  srcs = [
+    'glog_init.cpp',
+  ],
+  exported_headers = ['fb/glog_init.h'],
+  compiler_flags = [
+    '-fexceptions',
+    '-fno-omit-frame-pointer',
+  ],
+  linker_flags = [
+    '-llog',
+  ],
+  deps=[
+    '//xplat/third-party/glog:glog',
+  ],
+  visibility=['PUBLIC'],
+)
+

ReactAndroid/src/main/jni/first-party/fbgloginit/fb/glog_init.h

@@ -0,0 +1,11 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#pragma once
+
+#include <string>
+
+namespace facebook { namespace gloginit {
+
+void initialize(const char* tag = "ReactNativeJNI");
+
+}}

ReactAndroid/src/main/jni/first-party/fbgloginit/glog_init.cpp

@@ -0,0 +1,142 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#include "fb/glog_init.h"
+
+#include <iostream>
+#include <mutex>
+#include <stdexcept>
+
+#include <glog/logging.h>
+
+#ifdef __ANDROID__
+
+#include <android/log.h>
+
+static int toAndroidLevel(google::LogSeverity severity) {
+  switch (severity) {
+  case google::GLOG_INFO:
+    return ANDROID_LOG_INFO;
+  case google::GLOG_WARNING:
+    return ANDROID_LOG_WARN;
+  case google::GLOG_ERROR:
+    return ANDROID_LOG_ERROR;
+  case google::GLOG_FATAL:
+    return ANDROID_LOG_FATAL;
+  default:
+    return ANDROID_LOG_FATAL;
+  }
+}
+
+/**
+ * Sends GLog output to adb logcat.
+ */
+class LogcatSink : public google::LogSink {
+ public:
+  void send(
+      google::LogSeverity severity,
+      const char* full_filename,
+      const char* base_filename,
+      int line,
+      const struct ::tm* tm_time,
+      const char* message,
+      size_t message_len) override {
+    auto level = toAndroidLevel(severity);
+    __android_log_print(
+        level,
+        base_filename,
+        "%.*s",
+        (int)message_len,
+        message);
+  }
+};
+
+/**
+ * Sends GLog output to adb logcat.
+ */
+class TaggedLogcatSink : public google::LogSink {
+  const std::string tag_;
+
+ public:
+  TaggedLogcatSink(const std::string &tag) : tag_{tag} {}
+
+  void send(
+      google::LogSeverity severity,
+      const char* full_filename,
+      const char* base_filename,
+      int line,
+      const struct ::tm* tm_time,
+      const char* message,
+      size_t message_len) override {
+    auto level = toAndroidLevel(severity);
+    __android_log_print(
+      level,
+      tag_.c_str(),
+      "%.*s",
+      (int)message_len,
+      message);
+  }
+};
+
+static google::LogSink* make_sink(const std::string& tag) {
+  if (tag.empty()) {
+    return new LogcatSink{};
+  } else {
+    return new TaggedLogcatSink{tag};
+  }
+}
+
+static void sendGlogOutputToLogcat(const char* tag) {
+  google::AddLogSink(make_sink(tag));
+
+  // Disable logging to files
+  for (auto i = 0; i < google::NUM_SEVERITIES; ++i) {
+    google::SetLogDestination(i, "");
+  }
+}
+
+#endif // __ANDROID__
+
+static void lastResort(const char* tag, const char* msg, const char* arg = nullptr) {
+#ifdef __ANDROID__
+  if (!arg) {
+    __android_log_write(ANDROID_LOG_ERROR, tag, msg);
+  } else {
+    __android_log_print(ANDROID_LOG_ERROR, tag, "%s: %s", msg, arg);
+  }
+#else 
+  std::cerr << msg;
+  if (arg) {
+    std::cerr << ": " << arg;
+  }
+  std::cerr << std::endl;
+#endif
+}
+
+namespace facebook { namespace gloginit {
+
+void initialize(const char* tag) {
+  static std::once_flag flag{};
+  static auto failed = false;
+
+  std::call_once(flag, [tag] {
+    try {
+      google::InitGoogleLogging(tag);
+
+#ifdef __ANDROID__
+      sendGlogOutputToLogcat(tag);
+#endif
+    } catch (std::exception& ex) {
+      lastResort(tag, "Failed to initialize glog", ex.what());
+      failed = true;
+    } catch (...) {
+      lastResort(tag, "Failed to initialize glog");
+      failed = true;
+    }
+  });
+
+  if (failed) {
+    throw std::runtime_error{"Failed to initialize glog"};
+  }
+}
+
+}}

ReactAndroid/src/main/jni/react/jni/Android.mk

@@ -22,7 +22,7 @@ LOCAL_CFLAGS += $(CXX11_FLAGS)
 LOCAL_EXPORT_CPPFLAGS := $(CXX11_FLAGS)
 
 LOCAL_LDLIBS += -landroid
-LOCAL_SHARED_LIBRARIES := libfolly_json libfbjni libjsc
+LOCAL_SHARED_LIBRARIES := libfolly_json libfbjni libjsc libglog_init
 LOCAL_STATIC_LIBRARIES := libreactnative
 
 include $(BUILD_SHARED_LIBRARY)
@@ -30,5 +30,6 @@ include $(BUILD_SHARED_LIBRARY)
 $(call import-module,react)
 $(call import-module,jsc)
 $(call import-module,folly)
+$(call import-module,fbgloginit)
 $(call import-module,jni)
 $(call import-module,jsc)

ReactAndroid/src/main/jni/react/jni/BUCK

@@ -4,6 +4,7 @@ include_defs('//ReactAndroid/DEFS')
 SUPPORTED_PLATFORMS = '^android-(armv7|x86)$'
 
 DEPS = [
+  FBGLOGINIT_TARGET,
   '//native/jni:jni',
   '//native/third-party/android-ndk:android',
   '//xplat/folly:molly',

ReactAndroid/src/main/jni/react/jni/OnLoad.cpp

@@ -3,6 +3,7 @@
 #include <android/asset_manager_jni.h>
 #include <android/input.h>
 #include <fb/log.h>
+#include <fb/glog_init.h>
 #include <folly/json.h>
 #include <jni/Countable.h>
 #include <jni/Environment.h>
@@ -845,6 +846,7 @@ jmethodID getLogMarkerMethod() {
 
 extern "C" JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
   return initialize(vm, [] {
+    facebook::gloginit::initialize();
     // Inject some behavior into react/
     ReactMarker::logMarker = bridge::logMarker;
     WebWorkerUtil::createWebWorkerThread = WebWorkers::createWebWorkerThread;