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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2010 Sage Weil <sage@newdream.net>
* Copyright (C) 2010 Dreamhost
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_DOUT_H
#define CEPH_DOUT_H
#include <type_traits>
#include "include/ceph_assert.h"
#include "include/common_fwd.h"
#if defined(WITH_SEASTAR) && !defined(WITH_ALIEN)
#include <seastar/util/log.hh>
#include "crimson/common/log.h"
#include "crimson/common/config_proxy.h"
#else
#include "global/global_context.h"
#include "common/ceph_context.h"
#include "common/config.h"
#include "common/likely.h"
#include "common/Clock.h"
#include "log/Log.h"
#endif
extern void dout_emergency(const char * const str);
extern void dout_emergency(const std::string &str);
// intentionally conflict with endl
class _bad_endl_use_dendl_t { public: _bad_endl_use_dendl_t(int) {} };
static const _bad_endl_use_dendl_t endl = 0;
inline std::ostream& operator<<(std::ostream& out, _bad_endl_use_dendl_t) {
ceph_abort_msg("you are using the wrong endl.. use std::endl or dendl");
return out;
}
class DoutPrefixProvider {
public:
virtual std::ostream& gen_prefix(std::ostream& out) const = 0;
virtual CephContext *get_cct() const = 0;
virtual unsigned get_subsys() const = 0;
virtual ~DoutPrefixProvider() {}
};
inline std::ostream &operator<<(
std::ostream &lhs, const DoutPrefixProvider &dpp) {
return dpp.gen_prefix(lhs);
}
#if FMT_VERSION >= 90000
template <> struct fmt::formatter<DoutPrefixProvider> : fmt::ostream_formatter {};
#endif
// a prefix provider with empty prefix
class NoDoutPrefix : public DoutPrefixProvider {
CephContext *const cct;
const unsigned subsys;
public:
NoDoutPrefix(CephContext *cct, unsigned subsys) : cct(cct), subsys(subsys) {}
std::ostream& gen_prefix(std::ostream& out) const override { return out; }
CephContext *get_cct() const override { return cct; }
unsigned get_subsys() const override { return subsys; }
};
// a prefix provider with static (const char*) prefix
class DoutPrefix : public NoDoutPrefix {
const char *const prefix;
public:
DoutPrefix(CephContext *cct, unsigned subsys, const char *prefix)
: NoDoutPrefix(cct, subsys), prefix(prefix) {}
std::ostream& gen_prefix(std::ostream& out) const override {
return out << prefix;
}
};
// a prefix provider that composes itself on top of another
class DoutPrefixPipe : public DoutPrefixProvider {
const DoutPrefixProvider& dpp;
public:
DoutPrefixPipe(const DoutPrefixProvider& dpp) : dpp(dpp) {}
std::ostream& gen_prefix(std::ostream& out) const override final {
dpp.gen_prefix(out);
add_prefix(out);
return out;
}
CephContext *get_cct() const override { return dpp.get_cct(); }
unsigned get_subsys() const override { return dpp.get_subsys(); }
virtual void add_prefix(std::ostream& out) const = 0;
};
// helpers
namespace ceph::dout {
template<typename T>
struct dynamic_marker_t {
T value;
// constexpr ctor isn't needed as it's an aggregate type
constexpr operator T() const { return value; }
};
template<typename T>
constexpr dynamic_marker_t<T> need_dynamic(T&& t) {
return dynamic_marker_t<T>{ std::forward<T>(t) };
}
template<typename T>
struct is_dynamic : public std::false_type {};
template<typename T>
struct is_dynamic<dynamic_marker_t<T>> : public std::true_type {};
} // ceph::dout
// generic macros
#define dout_prefix *_dout
#if defined(WITH_SEASTAR) && !defined(WITH_ALIEN)
#define dout_impl(cct, sub, v) \
do { \
if (crimson::common::local_conf()->subsys.should_gather(sub, v)) { \
seastar::logger& _logger = crimson::get_logger(sub); \
const auto _lv = v; \
std::ostringstream _out; \
std::ostream* _dout = &_out;
#define dendl_impl \
""; \
_logger.log(crimson::to_log_level(_lv), \
"{}", _out.str().c_str()); \
} \
} while (0)
#else
#define dout_impl(cct, sub, v) \
do { \
const bool should_gather = [&](const auto cctX) { \
if constexpr (ceph::dout::is_dynamic<decltype(sub)>::value || \
ceph::dout::is_dynamic<decltype(v)>::value) { \
return cctX->_conf->subsys.should_gather(sub, v); \
} else { \
/* The parentheses are **essential** because commas in angle \
* brackets are NOT ignored on macro expansion! A language's \
* limitation, sorry. */ \
return (cctX->_conf->subsys.template should_gather<sub, v>()); \
} \
}(cct); \
\
if (should_gather) { \
ceph::logging::MutableEntry _dout_e(v, sub); \
static_assert(std::is_convertible<decltype(&*cct), \
CephContext* >::value, \
"provided cct must be compatible with CephContext*"); \
auto _dout_cct = cct; \
std::ostream* _dout = &_dout_e.get_ostream();
#define dendl_impl std::flush; \
_dout_cct->_log->submit_entry(std::move(_dout_e)); \
} \
} while (0)
#endif // WITH_SEASTAR
#define lsubdout(cct, sub, v) dout_impl(cct, ceph_subsys_##sub, v) dout_prefix
#define ldout(cct, v) dout_impl(cct, dout_subsys, v) dout_prefix
#define lderr(cct) dout_impl(cct, ceph_subsys_, -1) dout_prefix
#define ldpp_subdout(dpp, sub, v) \
if (decltype(auto) pdpp = (dpp); pdpp) /* workaround -Wnonnull-compare for 'this' */ \
dout_impl(pdpp->get_cct(), ceph_subsys_##sub, v) \
pdpp->gen_prefix(*_dout)
#define ldpp_dout(dpp, v) \
if (decltype(auto) pdpp = (dpp); pdpp) /* workaround -Wnonnull-compare for 'this' */ \
dout_impl(pdpp->get_cct(), ceph::dout::need_dynamic(pdpp->get_subsys()), v) \
pdpp->gen_prefix(*_dout)
#define lgeneric_subdout(cct, sub, v) dout_impl(cct, ceph_subsys_##sub, v) *_dout
#define lgeneric_dout(cct, v) dout_impl(cct, ceph_subsys_, v) *_dout
#define lgeneric_derr(cct) dout_impl(cct, ceph_subsys_, -1) *_dout
#define ldlog_p1(cct, sub, lvl) \
(cct->_conf->subsys.should_gather((sub), (lvl)))
#define dendl dendl_impl
#endif
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