mirror of
https://github.com/Telecominfraproject/wlan-cloud-lib-cppkafka.git
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128 lines
4.3 KiB
C++
128 lines
4.3 KiB
C++
/*
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* Copyright (c) 2017, Matias Fontanini
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef CPPKAFKA_CALLBACK_INVOKER_H
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#define CPPKAFKA_CALLBACK_INVOKER_H
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#include <sstream>
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#include <assert.h>
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#include "../logging.h"
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#include "../kafka_handle_base.h"
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namespace cppkafka {
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// Error values
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template <typename T>
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T error_value() { return T{}; }
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template<> inline
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void error_value<void>() {};
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template<> inline
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bool error_value<bool>() { return false; }
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template<> inline
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int error_value<int>() { return -1; }
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/**
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* \brief Wraps an std::function object and runs it while preventing all exceptions from escaping
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* \tparam Func An std::function object
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*/
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template <typename Func>
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class CallbackInvoker
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{
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public:
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using RetType = typename Func::result_type;
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using LogCallback = std::function<void(KafkaHandleBase& handle,
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int level,
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const std::string& facility,
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const std::string& message)>;
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CallbackInvoker(const char* callback_name,
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const Func& callback,
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KafkaHandleBase* handle)
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: callback_name_(callback_name),
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callback_(callback),
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handle_(handle) {
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}
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explicit operator bool() const {
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return (bool)callback_;
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}
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template <typename ...Args>
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RetType operator()(Args&&... args) const {
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static const char* library_name = "cppkafka";
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std::ostringstream error_msg;
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try {
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if (callback_) {
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return callback_(std::forward<Args>(args)...);
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}
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return error_value<RetType>();
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}
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catch (const std::exception& ex) {
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if (handle_) {
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error_msg << "Caught exception in " << callback_name_ << " callback: " << ex.what();
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}
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}
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catch (...) {
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if (handle_) {
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error_msg << "Caught unknown exception in " << callback_name_ << " callback";
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}
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}
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// Log error
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if (handle_) {
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if (handle_->get_configuration().get_log_callback()) {
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try {
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// Log it
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handle_->get_configuration().get_log_callback()(*handle_,
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static_cast<int>(LogLevel::LogErr),
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library_name,
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error_msg.str());
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}
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catch (...) {} // sink everything
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}
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else {
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rd_kafka_log_print(handle_->get_handle(),
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static_cast<int>(LogLevel::LogErr),
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library_name,
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error_msg.str().c_str());
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}
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}
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return error_value<RetType>();
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}
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private:
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const char* callback_name_;
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const Func& callback_;
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KafkaHandleBase* handle_;
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};
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}
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#endif
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