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/*
* Copyright (C) 2021 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.
*/
#include "libstatspull_lazy.h"
#include <mutex>
#include <dlfcn.h>
#include <stdatomic.h>
#include "log/log.h"
#include "stats_pull_atom_callback.h"
// This file provides a lazy interface to libstatspull.so to address early boot dependencies.
// Specifically bootanimation, surfaceflinger, and lmkd run before the statsd APEX is loaded and
// libstatspull.so is in the statsd APEX.
// Method pointers to libstatspull methods are held in an array which simplifies checking
// all pointers are initialized.
enum MethodIndex {
// PullAtomMetadata APIs in stats_pull_atom_callback.h.
k_AStatsManager_PullAtomMetadata_obtain,
k_AStatsManager_PullAtomMetadata_release,
k_AStatsManager_PullAtomMetadata_setCoolDownMillis,
k_AStatsManager_PullAtomMetadata_getCoolDownMillis,
k_AStatsManager_PullAtomMetadata_setTimeoutMillis,
k_AStatsManager_PullAtomMetadata_getTimeoutMillis,
k_AStatsManager_PullAtomMetadata_setAdditiveFields,
k_AStatsManager_PullAtomMetadata_getNumAdditiveFields,
k_AStatsManager_PullAtomMetadata_getAdditiveFields,
// AStatsEventList APIs in stats_pull_atom_callback.h
k_AStatsEventList_addStatsEvent,
// PullAtomCallback APIs in stats_pull_atom_callback.h
k_AStatsManager_setPullAtomCallback,
k_AStatsManager_clearPullAtomCallback,
// Marker for count of methods
k_MethodCount
};
// Table of methods pointers in libstatspull APIs.
static void* g_Methods[k_MethodCount];
//
// Libstatspull lazy loading.
//
static atomic_bool gPreventLibstatspullLoading = false; // Allows tests to block loading.
void PreventLibstatspullLazyLoadingForTests() {
gPreventLibstatspullLoading.store(true);
}
static void* LoadLibstatspull(int dlopen_flags) {
if (gPreventLibstatspullLoading.load()) {
return nullptr;
}
return dlopen("libstatspull.so", dlopen_flags);
}
//
// Initialization and symbol binding.
static void BindSymbol(void* handle, const char* name, enum MethodIndex index) {
void* symbol = dlsym(handle, name);
LOG_ALWAYS_FATAL_IF(symbol == nullptr, "Failed to find symbol '%s' in libstatspull.so: %s",
name, dlerror());
g_Methods[index] = symbol;
}
static void InitializeOnce() {
void* handle = LoadLibstatspull(RTLD_NOW);
LOG_ALWAYS_FATAL_IF(handle == nullptr, "Failed to load libstatspull.so: %s", dlerror());
#undef BIND_SYMBOL
#define BIND_SYMBOL(name) BindSymbol(handle, #name, k_##name);
// PullAtomMetadata APIs in stats_pull_atom_callback.h.
BIND_SYMBOL(AStatsManager_PullAtomMetadata_obtain);
BIND_SYMBOL(AStatsManager_PullAtomMetadata_release);
BIND_SYMBOL(AStatsManager_PullAtomMetadata_setCoolDownMillis);
BIND_SYMBOL(AStatsManager_PullAtomMetadata_getCoolDownMillis);
BIND_SYMBOL(AStatsManager_PullAtomMetadata_setTimeoutMillis);
BIND_SYMBOL(AStatsManager_PullAtomMetadata_getTimeoutMillis);
BIND_SYMBOL(AStatsManager_PullAtomMetadata_setAdditiveFields);
BIND_SYMBOL(AStatsManager_PullAtomMetadata_getNumAdditiveFields);
BIND_SYMBOL(AStatsManager_PullAtomMetadata_getAdditiveFields);
// AStatsEventList APIs in stats_pull_atom_callback.h
BIND_SYMBOL(AStatsEventList_addStatsEvent);
// PullAtomCallback APIs in stats_pull_atom_callback.h
BIND_SYMBOL(AStatsManager_setPullAtomCallback);
BIND_SYMBOL(AStatsManager_clearPullAtomCallback);
#undef BIND_SYMBOL
// Check every symbol is bound.
for (int i = 0; i < k_MethodCount; ++i) {
LOG_ALWAYS_FATAL_IF(g_Methods[i] == nullptr,
"Uninitialized method in libstatspull_lazy at index: %d", i);
}
}
static void EnsureInitialized() {
static std::once_flag initialize_flag;
std::call_once(initialize_flag, InitializeOnce);
}
#define INVOKE_METHOD(name, args...) \
do { \
EnsureInitialized(); \
void* method = g_Methods[k_##name]; \
return reinterpret_cast<decltype(&name)>(method)(args); \
} while (0)
//
// Forwarding for methods in stats_pull_atom_callback.h.
//
AStatsManager_PullAtomMetadata* AStatsManager_PullAtomMetadata_obtain() {
INVOKE_METHOD(AStatsManager_PullAtomMetadata_obtain);
}
void AStatsManager_PullAtomMetadata_release(AStatsManager_PullAtomMetadata* metadata) {
INVOKE_METHOD(AStatsManager_PullAtomMetadata_release, metadata);
}
void AStatsManager_PullAtomMetadata_setCoolDownMillis(AStatsManager_PullAtomMetadata* metadata,
int64_t cool_down_millis) {
INVOKE_METHOD(AStatsManager_PullAtomMetadata_setCoolDownMillis, metadata, cool_down_millis);
}
int64_t AStatsManager_PullAtomMetadata_getCoolDownMillis(AStatsManager_PullAtomMetadata* metadata) {
INVOKE_METHOD(AStatsManager_PullAtomMetadata_getCoolDownMillis, metadata);
}
void AStatsManager_PullAtomMetadata_setTimeoutMillis(AStatsManager_PullAtomMetadata* metadata,
int64_t timeout_millis) {
INVOKE_METHOD(AStatsManager_PullAtomMetadata_setTimeoutMillis, metadata, timeout_millis);
}
int64_t AStatsManager_PullAtomMetadata_getTimeoutMillis(AStatsManager_PullAtomMetadata* metadata) {
INVOKE_METHOD(AStatsManager_PullAtomMetadata_getTimeoutMillis, metadata);
}
void AStatsManager_PullAtomMetadata_setAdditiveFields(AStatsManager_PullAtomMetadata* metadata,
int32_t* additive_fields,
int32_t num_fields) {
INVOKE_METHOD(AStatsManager_PullAtomMetadata_setAdditiveFields, metadata, additive_fields,
num_fields);
}
int32_t AStatsManager_PullAtomMetadata_getNumAdditiveFields(
AStatsManager_PullAtomMetadata* metadata) {
INVOKE_METHOD(AStatsManager_PullAtomMetadata_getNumAdditiveFields, metadata);
}
void AStatsManager_PullAtomMetadata_getAdditiveFields(AStatsManager_PullAtomMetadata* metadata,
int32_t* fields) {
INVOKE_METHOD(AStatsManager_PullAtomMetadata_getAdditiveFields, metadata, fields);
}
AStatsEvent* AStatsEventList_addStatsEvent(AStatsEventList* pull_data) {
INVOKE_METHOD(AStatsEventList_addStatsEvent, pull_data);
}
void AStatsManager_setPullAtomCallback(int32_t atom_tag, AStatsManager_PullAtomMetadata* metadata,
AStatsManager_PullAtomCallback callback, void* cookie) {
INVOKE_METHOD(AStatsManager_setPullAtomCallback, atom_tag, metadata, callback, cookie);
}
void AStatsManager_clearPullAtomCallback(int32_t atom_tag) {
INVOKE_METHOD(AStatsManager_clearPullAtomCallback, atom_tag);
}
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