如何将自定义记录器与websocketpp一起使用?

对于任何想要使用 spdlog 作为客户记录器的示例代码的人来说，这里是：

创建一个包含以下内容的新文件customerLogger.hpp：

#pragma once
#include <websocketpp/logger/basic.hpp>
#include <websocketpp/common/cpp11.hpp>
#include <websocketpp/logger/levels.hpp>
#include "spdlog/logger.h"
#include "spdlog/sinks/rotating_file_sink.h"
namespace websocketpp {
namespace log {
/// Basic logger that outputs to syslog
template <typename concurrency, typename names>
class myLogger : public basic<concurrency, names> {
public:
typedef basic<concurrency, names> base;
/// Construct the logger
/**
* @param hint A channel type specific hint for how to construct the logger
*/
myLogger<concurrency,names>(channel_type_hint::value hint =
channel_type_hint::access)
: basic<concurrency,names>(hint), m_channel_type_hint(hint) {
auto max_size = 1048576 * 5;
auto max_files = 3;
auto rotating_sink = std::make_shared<spdlog::sinks::rotating_file_sink_mt> ("/var/logs/my_logger.log", max_size, max_files);
m_logger = std::make_shared<spdlog::logger>("my_logger", rotating_sink);
m_logger->flush_on(spdlog::level::info);
m_logger->set_level(spdlog::level::level_enum::info);
}
/// Construct the logger
/**
* @param channels A set of channels to statically enable
* @param hint A channel type specific hint for how to construct the logger
*/
myLogger<concurrency,names>(level channels, channel_type_hint::value hint =
channel_type_hint::access)
: basic<concurrency,names>(channels, hint), m_channel_type_hint(hint) {
auto max_size = 1048576 * 5;
auto max_files = 3;
auto rotating_sink = std::make_shared<spdlog::sinks::rotating_file_sink_mt> ("/var/logs/my_logger.log", max_size, max_files);
m_logger = std::make_shared<spdlog::logger>("my_logger", rotating_sink);
m_logger->flush_on(spdlog::level::info);
m_logger->set_level(spdlog::level::level_enum::info);
}
/// Write a string message to the given channel
/**
* @param channel The channel to write to
* @param msg The message to write
*/
void write(level channel, std::string const & msg) {
write(channel, msg.c_str());
}
/// Write a cstring message to the given channel
/**
* @param channel The channel to write to
* @param msg The message to write
*/
void write(level channel, char const * msg) {
scoped_lock_type lock(base::m_lock);
if (!this->dynamic_test(channel)) { return; }
if (m_channel_type_hint == channel_type_hint::access) {
m_logger->info(msg);
} else {
if (channel == elevel::devel) {
m_logger->debug(msg);
} else if (channel == elevel::library) {
m_logger->debug(msg);
} else if (channel == elevel::info) {
m_logger->info(msg);
} else if (channel == elevel::warn) {
m_logger->warn(msg);
} else if (channel == elevel::rerror) {
m_logger->error(msg);
} else if (channel == elevel::fatal) {
m_logger->critical(msg);
}
}
}
private:
std::shared_ptr<spdlog::logger> m_logger;
typedef typename base::scoped_lock_type scoped_lock_type;
channel_type_hint::value m_channel_type_hint;
};
} // log
} // websocketpp

接下来，创建另一个文件，customConfig.hpp其中包含以下内容：

#pragma once
#include "./customLogger.hpp"
#include <websocketpp/logger/syslog.hpp>
#include <websocketpp/extensions/permessage_deflate/enabled.hpp>
// Custom server config based on bundled asio config
struct my_config : public websocketpp::config::asio {
// Replace default stream logger with the custom logger
typedef websocketpp::log::myLogger<concurrency_type, websocketpp::log::elevel> elog_type;
typedef websocketpp::log::myLogger<concurrency_type, websocketpp::log::alevel> alog_type;
};
typedef websocketpp::server<my_config> my_server;

最后，当您想要创建服务器时，您只需执行my_server endpoint;

构建自定义记录器有两个步骤。首先，使用适当的接口编写策略类，然后创建使用该策略的自定义配置。

编写策略类websocketpp::log::stub是一个最小的实现，它实际上不做任何事情(它主要用于在单元测试中存根日志记录(，但它演示并记录了日志记录类需要实现的接口。日志记录类不需要是websocketpp::log::stub的子类。您可以查看websocketpp/logger/*文件夹中的其他示例。特别是系统日志记录器作为输出到标准输出以外的其他内容的日志记录策略的示例可能很有趣。

要设置自定义配置，您将创建一个配置类。它可以是独立的，也可以是标准类之一的子类，如websocketpp::config::asio，只是覆盖了少量的东西。例如，您的配置可能只覆盖记录器。创建后，您将配置类传递到端点模板参数中，而不是websocketpp::config::asio。

有关在编译时可以通过此配置系统覆盖的内容的更多详细信息，请参阅 https://docs.websocketpp.org/reference_8config.html。此页面上有一个示例，显示了替换默认记录器的自定义配置(以及其他更改(。