| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef FRAMEWORKS_BASE_CORE_JNI_EVENTLOG_HELPER_H_ |
| #define FRAMEWORKS_BASE_CORE_JNI_EVENTLOG_HELPER_H_ |
| |
| #include <memory> |
| |
| #include <fcntl.h> |
| |
| #include <android-base/macros.h> |
| #include <log/log_event_list.h> |
| |
| #include <log/log.h> |
| |
| #include <nativehelper/JNIHelp.h> |
| #include <nativehelper/ScopedLocalRef.h> |
| #include <nativehelper/ScopedPrimitiveArray.h> |
| #include <nativehelper/ScopedUtfChars.h> |
| #include "core_jni_helpers.h" |
| #include "jni.h" |
| |
| namespace android { |
| |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| class EventLogHelper { |
| public: |
| static void Init(JNIEnv* env) { |
| struct { const char *name; jclass *clazz; } gClasses[] = { |
| { EventClassDescriptor, &gEventClass }, |
| { "java/lang/Integer", &gIntegerClass }, |
| { "java/lang/Long", &gLongClass }, |
| { "java/lang/Float", &gFloatClass }, |
| { "java/lang/String", &gStringClass }, |
| { "java/util/Collection", &gCollectionClass }, |
| }; |
| struct { jclass *c; const char *name, *ft; jfieldID *id; } gFields[] = { |
| { &gIntegerClass, "value", "I", &gIntegerValueID }, |
| { &gLongClass, "value", "J", &gLongValueID }, |
| { &gFloatClass, "value", "F", &gFloatValueID }, |
| }; |
| struct { jclass *c; const char *name, *mt; jmethodID *id; } gMethods[] = { |
| { &gEventClass, "<init>", "([B)V", &gEventInitID }, |
| { &gCollectionClass, "add", "(Ljava/lang/Object;)Z", &gCollectionAddID }, |
| }; |
| |
| for (size_t i = 0; i < NELEM(gClasses); ++i) { |
| ScopedLocalRef<jclass> clazz(env, FindClassOrDie(env, gClasses[i].name)); |
| *gClasses[i].clazz = MakeGlobalRefOrDie(env, clazz.get()); |
| } |
| for (size_t i = 0; i < NELEM(gFields); ++i) { |
| *gFields[i].id = GetFieldIDOrDie(env, |
| *gFields[i].c, gFields[i].name, gFields[i].ft); |
| } |
| |
| for (size_t i = 0; i < NELEM(gMethods); ++i) { |
| *gMethods[i].id = GetMethodIDOrDie(env, |
| *gMethods[i].c, gMethods[i].name, gMethods[i].mt); |
| } |
| } |
| |
| static jint writeEventInteger(JNIEnv* env ATTRIBUTE_UNUSED, jobject clazz ATTRIBUTE_UNUSED, |
| jint tag, jint value) { |
| android_log_event_list ctx(tag); |
| ctx << (int32_t)value; |
| return ctx.write(LogID); |
| } |
| static jint writeEventLong(JNIEnv* env ATTRIBUTE_UNUSED, jobject clazz ATTRIBUTE_UNUSED, |
| jint tag, jlong value) { |
| android_log_event_list ctx(tag); |
| ctx << (int64_t)value; |
| return ctx.write(LogID); |
| } |
| static jint writeEventFloat(JNIEnv* env ATTRIBUTE_UNUSED, jobject clazz ATTRIBUTE_UNUSED, |
| jint tag, jfloat value) { |
| android_log_event_list ctx(tag); |
| ctx << (float)value; |
| return ctx.write(LogID); |
| } |
| static jint writeEventString(JNIEnv* env, jobject clazz ATTRIBUTE_UNUSED, jint tag, |
| jstring value) { |
| android_log_event_list ctx(tag); |
| // Don't throw NPE -- I feel like it's sort of mean for a logging function |
| // to be all crashy if you pass in NULL -- but make the NULL value explicit. |
| ctx << (value != nullptr ? ScopedUtfChars(env, value).c_str() : "NULL"); |
| return ctx.write(LogID); |
| } |
| static jint writeEventArray(JNIEnv* env, jobject clazz ATTRIBUTE_UNUSED, jint tag, |
| jobjectArray value) { |
| android_log_event_list ctx(tag); |
| |
| if (value == nullptr) { |
| ctx << "[NULL]"; |
| return ctx.write(LogID); |
| } |
| |
| jsize copied = 0, num = env->GetArrayLength(value); |
| for (; copied < num && copied < 255; ++copied) { |
| if (ctx.status()) break; |
| ScopedLocalRef<jobject> item(env, env->GetObjectArrayElement(value, copied)); |
| if (item == nullptr) { |
| ctx << "NULL"; |
| } else if (env->IsInstanceOf(item.get(), gStringClass)) { |
| ctx << ScopedUtfChars(env, (jstring) item.get()).c_str(); |
| } else if (env->IsInstanceOf(item.get(), gIntegerClass)) { |
| ctx << (int32_t)env->GetIntField(item.get(), gIntegerValueID); |
| } else if (env->IsInstanceOf(item.get(), gLongClass)) { |
| ctx << (int64_t)env->GetLongField(item.get(), gLongValueID); |
| } else if (env->IsInstanceOf(item.get(), gFloatClass)) { |
| ctx << (float)env->GetFloatField(item.get(), gFloatValueID); |
| } else { |
| jniThrowException(env, |
| "java/lang/IllegalArgumentException", |
| "Invalid payload item type"); |
| return -1; |
| } |
| } |
| return ctx.write(LogID); |
| } |
| |
| static void readEvents(JNIEnv* env, int loggerMode, jlong startTime, jobject out) { |
| readEvents(env, loggerMode, nullptr, startTime, out); |
| } |
| |
| static void readEvents(JNIEnv* env, int loggerMode, jintArray jTags, jlong startTime, |
| jobject out) { |
| std::unique_ptr<struct logger_list, decltype(&android_logger_list_close)> logger_list( |
| nullptr, android_logger_list_close); |
| if (startTime) { |
| logger_list.reset(android_logger_list_alloc_time(loggerMode, |
| log_time(startTime / NS_PER_SEC, startTime % NS_PER_SEC), 0)); |
| } else { |
| logger_list.reset(android_logger_list_alloc(loggerMode, 0, 0)); |
| } |
| if (!logger_list) { |
| jniThrowIOException(env, errno); |
| return; |
| } |
| |
| if (!android_logger_open(logger_list.get(), LogID)) { |
| jniThrowIOException(env, errno); |
| return; |
| } |
| |
| ScopedIntArrayRO tags(env); |
| if (jTags != nullptr) { |
| tags.reset(jTags); |
| } |
| |
| while (1) { |
| log_msg log_msg; |
| int ret = android_logger_list_read(logger_list.get(), &log_msg); |
| |
| if (ret == 0) { |
| return; |
| } |
| if (ret < 0) { |
| if (ret == -EINTR) { |
| continue; |
| } |
| if (ret == -EINVAL) { |
| jniThrowException(env, "java/io/IOException", "Event too short"); |
| } else if (ret != -EAGAIN) { |
| jniThrowIOException(env, -ret); // Will throw on return |
| } |
| return; |
| } |
| |
| if (log_msg.id() != LogID) { |
| continue; |
| } |
| |
| int32_t tag = * (int32_t *) log_msg.msg(); |
| |
| if (jTags != nullptr) { |
| bool found = false; |
| for (size_t i = 0; !found && i < tags.size(); ++i) { |
| found = (tag == tags[i]); |
| } |
| if (!found) { |
| continue; |
| } |
| } |
| |
| jsize len = ret; |
| ScopedLocalRef<jbyteArray> array(env, env->NewByteArray(len)); |
| if (array == nullptr) { |
| return; |
| } |
| |
| { |
| ScopedByteArrayRW bytes(env, array.get()); |
| memcpy(bytes.get(), log_msg.buf, len); |
| } |
| |
| ScopedLocalRef<jobject> event(env, |
| env->NewObject(gEventClass, gEventInitID, array.get())); |
| if (event == nullptr) { |
| return; |
| } |
| |
| env->CallBooleanMethod(out, gCollectionAddID, event.get()); |
| if (env->ExceptionCheck() == JNI_TRUE) { |
| return; |
| } |
| } |
| } |
| |
| private: |
| static jclass gCollectionClass; |
| static jmethodID gCollectionAddID; |
| |
| static jclass gEventClass; |
| static jmethodID gEventInitID; |
| |
| static jclass gIntegerClass; |
| static jfieldID gIntegerValueID; |
| |
| static jclass gLongClass; |
| static jfieldID gLongValueID; |
| |
| static jclass gFloatClass; |
| static jfieldID gFloatValueID; |
| |
| static jclass gStringClass; |
| }; |
| |
| // Explicit instantiation declarations. |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jclass EventLogHelper<LogID, EventClassDescriptor>::gCollectionClass; |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jmethodID EventLogHelper<LogID, EventClassDescriptor>::gCollectionAddID; |
| |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jclass EventLogHelper<LogID, EventClassDescriptor>::gEventClass; |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jmethodID EventLogHelper<LogID, EventClassDescriptor>::gEventInitID; |
| |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jclass EventLogHelper<LogID, EventClassDescriptor>::gIntegerClass; |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jfieldID EventLogHelper<LogID, EventClassDescriptor>::gIntegerValueID; |
| |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jclass EventLogHelper<LogID, EventClassDescriptor>::gLongClass; |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jfieldID EventLogHelper<LogID, EventClassDescriptor>::gLongValueID; |
| |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jclass EventLogHelper<LogID, EventClassDescriptor>::gFloatClass; |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jfieldID EventLogHelper<LogID, EventClassDescriptor>::gFloatValueID; |
| |
| template <log_id_t LogID, const char* EventClassDescriptor> |
| jclass EventLogHelper<LogID, EventClassDescriptor>::gStringClass; |
| |
| } // namespace android |
| |
| #endif // FRAMEWORKS_BASE_CORE_JNI_EVENTLOG_HELPER_H_ |