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Catch cxx exception

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This commit is contained in:
fanchao 2024-05-28 11:34:52 +10:00
parent b30506ff64
commit 5769c011bc
2 changed files with 126 additions and 52 deletions
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125
libsession-util/src/main/cpp/contacts.cpp
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@ -1,100 +1,121 @@
#include "contacts.h"
#include "util.h"
#include "jni_utils.h"
extern "C"
JNIEXPORT jobject JNICALL
Java_network_loki_messenger_libsession_1util_Contacts_get(JNIEnv *env, jobject thiz,
jstring session_id) {
std::lock_guard lock{util::util_mutex_};
auto contacts = ptrToContacts(env, thiz);
auto session_id_chars = env->GetStringUTFChars(session_id, nullptr);
auto contact = contacts->get(session_id_chars);
env->ReleaseStringUTFChars(session_id, session_id_chars);
if (!contact) return nullptr;
jobject j_contact = serialize_contact(env, contact.value());
return j_contact;
// If an exception is thrown, return nullptr
return jni_utils::run_catching_cxx_exception_or<jobject>(
[=]() -> jobject {
std::lock_guard lock{util::util_mutex_};
auto contacts = ptrToContacts(env, thiz);
auto session_id_chars = env->GetStringUTFChars(session_id, nullptr);
auto contact = contacts->get(session_id_chars);
env->ReleaseStringUTFChars(session_id, session_id_chars);
if (!contact) return nullptr;
jobject j_contact = serialize_contact(env, contact.value());
return j_contact;
},
[](const char *) -> jobject { return nullptr; }
);
}
extern "C"
JNIEXPORT jobject JNICALL
Java_network_loki_messenger_libsession_1util_Contacts_getOrConstruct(JNIEnv *env, jobject thiz,
jstring session_id) {
std::lock_guard lock{util::util_mutex_};
auto contacts = ptrToContacts(env, thiz);
auto session_id_chars = env->GetStringUTFChars(session_id, nullptr);
auto contact = contacts->get_or_construct(session_id_chars);
env->ReleaseStringUTFChars(session_id, session_id_chars);
return serialize_contact(env, contact);
return jni_utils::run_catching_cxx_exception_or_throws<jobject>(env, [=] {
std::lock_guard lock{util::util_mutex_};
auto contacts = ptrToContacts(env, thiz);
auto session_id_chars = env->GetStringUTFChars(session_id, nullptr);
auto contact = contacts->get_or_construct(session_id_chars);
env->ReleaseStringUTFChars(session_id, session_id_chars);
return serialize_contact(env, contact);
});
}
extern "C"
JNIEXPORT void JNICALL
Java_network_loki_messenger_libsession_1util_Contacts_set(JNIEnv *env, jobject thiz,
jobject contact) {
std::lock_guard lock{util::util_mutex_};
auto contacts = ptrToContacts(env, thiz);
auto contact_info = deserialize_contact(env, contact, contacts);
contacts->set(contact_info);
jni_utils::run_catching_cxx_exception_or_throws<void>(env, [=] {
std::lock_guard lock{util::util_mutex_};
auto contacts = ptrToContacts(env, thiz);
auto contact_info = deserialize_contact(env, contact, contacts);
contacts->set(contact_info);
});
}
extern "C"
JNIEXPORT jboolean JNICALL
Java_network_loki_messenger_libsession_1util_Contacts_erase(JNIEnv *env, jobject thiz,
jstring session_id) {
std::lock_guard lock{util::util_mutex_};
auto contacts = ptrToContacts(env, thiz);
auto session_id_chars = env->GetStringUTFChars(session_id, nullptr);
return jni_utils::run_catching_cxx_exception_or_throws<jboolean>(env, [=] {
std::lock_guard lock{util::util_mutex_};
auto contacts = ptrToContacts(env, thiz);
auto session_id_chars = env->GetStringUTFChars(session_id, nullptr);
bool result = contacts->erase(session_id_chars);
env->ReleaseStringUTFChars(session_id, session_id_chars);
return result;
bool result = contacts->erase(session_id_chars);
env->ReleaseStringUTFChars(session_id, session_id_chars);
return result;
});
}
extern "C"
#pragma clang diagnostic push
#pragma ide diagnostic ignored "bugprone-reserved-identifier"
JNIEXPORT jobject JNICALL
Java_network_loki_messenger_libsession_1util_Contacts_00024Companion_newInstance___3B(JNIEnv *env,
jobject thiz,
jbyteArray ed25519_secret_key) {
std::lock_guard lock{util::util_mutex_};
auto secret_key = util::ustring_from_bytes(env, ed25519_secret_key);
auto* contacts = new session::config::Contacts(secret_key, std::nullopt);
jobject thiz,
jbyteArray ed25519_secret_key) {
return jni_utils::run_catching_cxx_exception_or_throws<jobject>(env, [=] {
std::lock_guard lock{util::util_mutex_};
auto secret_key = util::ustring_from_bytes(env, ed25519_secret_key);
auto *contacts = new session::config::Contacts(secret_key, std::nullopt);
jclass contactsClass = env->FindClass("network/loki/messenger/libsession_util/Contacts");
jmethodID constructor = env->GetMethodID(contactsClass, "<init>", "(J)V");
jobject newConfig = env->NewObject(contactsClass, constructor, reinterpret_cast<jlong>(contacts));
jclass contactsClass = env->FindClass("network/loki/messenger/libsession_util/Contacts");
jmethodID constructor = env->GetMethodID(contactsClass, "<init>", "(J)V");
jobject newConfig = env->NewObject(contactsClass, constructor,
reinterpret_cast<jlong>(contacts));
return newConfig;
return newConfig;
});
}
extern "C"
JNIEXPORT jobject JNICALL
Java_network_loki_messenger_libsession_1util_Contacts_00024Companion_newInstance___3B_3B(
JNIEnv *env, jobject thiz, jbyteArray ed25519_secret_key, jbyteArray initial_dump) {
std::lock_guard lock{util::util_mutex_};
auto secret_key = util::ustring_from_bytes(env, ed25519_secret_key);
auto initial = util::ustring_from_bytes(env, initial_dump);
return jni_utils::run_catching_cxx_exception_or_throws<jobject>(env, [=] {
std::lock_guard lock{util::util_mutex_};
auto secret_key = util::ustring_from_bytes(env, ed25519_secret_key);
auto initial = util::ustring_from_bytes(env, initial_dump);
auto* contacts = new session::config::Contacts(secret_key, initial);
auto *contacts = new session::config::Contacts(secret_key, initial);
jclass contactsClass = env->FindClass("network/loki/messenger/libsession_util/Contacts");
jmethodID constructor = env->GetMethodID(contactsClass, "<init>", "(J)V");
jobject newConfig = env->NewObject(contactsClass, constructor, reinterpret_cast<jlong>(contacts));
jclass contactsClass = env->FindClass("network/loki/messenger/libsession_util/Contacts");
jmethodID constructor = env->GetMethodID(contactsClass, "<init>", "(J)V");
jobject newConfig = env->NewObject(contactsClass, constructor,
reinterpret_cast<jlong>(contacts));
return newConfig;
return newConfig;
});
}
#pragma clang diagnostic pop
extern "C"
JNIEXPORT jobject JNICALL
Java_network_loki_messenger_libsession_1util_Contacts_all(JNIEnv *env, jobject thiz) {
std::lock_guard lock{util::util_mutex_};
auto contacts = ptrToContacts(env, thiz);
jclass stack = env->FindClass("java/util/Stack");
jmethodID init = env->GetMethodID(stack, "<init>", "()V");
jobject our_stack = env->NewObject(stack, init);
jmethodID push = env->GetMethodID(stack, "push", "(Ljava/lang/Object;)Ljava/lang/Object;");
for (const auto& contact : *contacts) {
auto contact_obj = serialize_contact(env, contact);
env->CallObjectMethod(our_stack, push, contact_obj);
}
return our_stack;
return jni_utils::run_catching_cxx_exception_or_throws<jobject>(env, [=] {
std::lock_guard lock{util::util_mutex_};
auto contacts = ptrToContacts(env, thiz);
jclass stack = env->FindClass("java/util/Stack");
jmethodID init = env->GetMethodID(stack, "<init>", "()V");
jobject our_stack = env->NewObject(stack, init);
jmethodID push = env->GetMethodID(stack, "push", "(Ljava/lang/Object;)Ljava/lang/Object;");
for (const auto &contact: *contacts) {
auto contact_obj = serialize_contact(env, contact);
env->CallObjectMethod(our_stack, push, contact_obj);
}
return our_stack;
});
}

53
libsession-util/src/main/cpp/jni_utils.h Normal file
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#ifndef SESSION_ANDROID_JNI_UTILS_H
#define SESSION_ANDROID_JNI_UTILS_H
#include <jni.h>
#include <exception>
namespace jni_utils {
/**
* Run a C++ function and catch any exceptions, throwing a Java exception if one is caught,
* and returning a default-constructed value of the specified type.
*
* @tparam RetT The return type of the function
* @tparam Func The function type
* @param f The function to run
* @param fallbackRun The function to run if an exception is caught. The optional exception message reference will be passed to this function.
* @return The return value of the function, or the return value of the fallback function if an exception was caught
*/
template<class RetT, class Func, class FallbackRun>
RetT run_catching_cxx_exception_or(Func f, FallbackRun fallbackRun) {
try {
return f();
} catch (const std::exception &e) {
return fallbackRun(e.what());
} catch (...) {
return fallbackRun(nullptr);
}
}
/**
* Run a C++ function and catch any exceptions, throwing a Java exception if one is caught.
*
* @tparam RetT The return type of the function
* @tparam Func The function type
* @param env The JNI environment
* @param f The function to run
* @return The return value of the function, or a default-constructed value of the specified type if an exception was caught
*/
template<class RetT, class Func>
RetT run_catching_cxx_exception_or_throws(JNIEnv *env, Func f) {
return run_catching_cxx_exception_or<RetT>(f, [env](const char *msg) {
jclass exceptionClass = env->FindClass("java/lang/RuntimeException");
if (msg) {
env->ThrowNew(exceptionClass, msg);
} else {
env->ThrowNew(exceptionClass, "Unknown C++ exception");
}
return RetT();
});
}
}
#endif //SESSION_ANDROID_JNI_UTILS_H