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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "Log.h"
#include "common/errno.h"
#include "common/safe_io.h"
#include "common/Graylog.h"
#include "common/valgrind.h"
#include "include/ceph_assert.h"
#include "include/compat.h"
#include "include/on_exit.h"
#include "Entry.h"
#include "LogClock.h"
#include "SubsystemMap.h"
#include <errno.h>
#include <fcntl.h>
#include <syslog.h>
#include <iostream>
#define MAX_LOG_BUF 65536
namespace ceph {
namespace logging {
static OnExitManager exit_callbacks;
static void log_on_exit(void *p)
{
Log *l = *(Log **)p;
if (l)
l->flush();
delete (Log **)p;// Delete allocated pointer (not Log object, the pointer only!)
}
Log::Log(const SubsystemMap *s)
: m_indirect_this(nullptr),
m_subs(s),
m_recent(DEFAULT_MAX_RECENT)
{
m_log_buf.reserve(MAX_LOG_BUF);
}
Log::~Log()
{
if (m_indirect_this) {
*m_indirect_this = nullptr;
}
ceph_assert(!is_started());
if (m_fd >= 0)
VOID_TEMP_FAILURE_RETRY(::close(m_fd));
}
///
void Log::set_coarse_timestamps(bool coarse) {
std::scoped_lock lock(m_flush_mutex);
if (coarse)
Entry::clock().coarsen();
else
Entry::clock().refine();
}
void Log::set_flush_on_exit()
{
std::scoped_lock lock(m_flush_mutex);
// Make sure we flush on shutdown. We do this by deliberately
// leaking an indirect pointer to ourselves (on_exit() can't
// unregister a callback). This is not racy only becuase we
// assume that exit() won't race with ~Log().
if (m_indirect_this == NULL) {
m_indirect_this = new (Log*)(this);
exit_callbacks.add_callback(log_on_exit, m_indirect_this);
}
}
void Log::set_max_new(std::size_t n)
{
std::scoped_lock lock(m_queue_mutex);
m_max_new = n;
}
void Log::set_max_recent(std::size_t n)
{
std::scoped_lock lock(m_flush_mutex);
m_max_recent = n;
}
void Log::set_log_file(std::string_view fn)
{
std::scoped_lock lock(m_flush_mutex);
m_log_file = fn;
}
void Log::set_log_stderr_prefix(std::string_view p)
{
std::scoped_lock lock(m_flush_mutex);
m_log_stderr_prefix = p;
}
void Log::reopen_log_file()
{
std::scoped_lock lock(m_flush_mutex);
if (!is_started()) {
return;
}
m_flush_mutex_holder = pthread_self();
if (m_fd >= 0)
VOID_TEMP_FAILURE_RETRY(::close(m_fd));
if (m_log_file.length()) {
m_fd = ::open(m_log_file.c_str(), O_CREAT|O_WRONLY|O_APPEND|O_CLOEXEC, 0644);
if (m_fd >= 0 && (m_uid || m_gid)) {
if (::fchown(m_fd, m_uid, m_gid) < 0) {
int e = errno;
std::cerr << "failed to chown " << m_log_file << ": " << cpp_strerror(e)
<< std::endl;
}
}
} else {
m_fd = -1;
}
m_flush_mutex_holder = 0;
}
void Log::chown_log_file(uid_t uid, gid_t gid)
{
std::scoped_lock lock(m_flush_mutex);
if (m_fd >= 0) {
int r = ::fchown(m_fd, uid, gid);
if (r < 0) {
r = -errno;
std::cerr << "failed to chown " << m_log_file << ": " << cpp_strerror(r)
<< std::endl;
}
}
}
void Log::set_syslog_level(int log, int crash)
{
std::scoped_lock lock(m_flush_mutex);
m_syslog_log = log;
m_syslog_crash = crash;
}
void Log::set_stderr_level(int log, int crash)
{
std::scoped_lock lock(m_flush_mutex);
m_stderr_log = log;
m_stderr_crash = crash;
}
void Log::set_graylog_level(int log, int crash)
{
std::scoped_lock lock(m_flush_mutex);
m_graylog_log = log;
m_graylog_crash = crash;
}
void Log::start_graylog()
{
std::scoped_lock lock(m_flush_mutex);
if (! m_graylog.get())
m_graylog = std::make_shared<Graylog>(m_subs, "dlog");
}
void Log::stop_graylog()
{
std::scoped_lock lock(m_flush_mutex);
m_graylog.reset();
}
void Log::submit_entry(Entry&& e)
{
std::unique_lock lock(m_queue_mutex);
m_queue_mutex_holder = pthread_self();
if (unlikely(m_inject_segv))
*(volatile int *)(0) = 0xdead;
// wait for flush to catch up
while (is_started() &&
m_new.size() > m_max_new) {
if (m_stop) break; // force addition
m_cond_loggers.wait(lock);
}
m_new.emplace_back(std::move(e));
m_cond_flusher.notify_all();
m_queue_mutex_holder = 0;
}
void Log::flush()
{
std::scoped_lock lock1(m_flush_mutex);
m_flush_mutex_holder = pthread_self();
{
std::scoped_lock lock2(m_queue_mutex);
m_queue_mutex_holder = pthread_self();
assert(m_flush.empty());
m_flush.swap(m_new);
m_cond_loggers.notify_all();
m_queue_mutex_holder = 0;
}
_flush(m_flush, true, false);
m_flush_mutex_holder = 0;
}
void Log::_log_safe_write(std::string_view sv)
{
if (m_fd < 0)
return;
int r = safe_write(m_fd, sv.data(), sv.size());
if (r != m_fd_last_error) {
if (r < 0)
std::cerr << "problem writing to " << m_log_file
<< ": " << cpp_strerror(r)
<< std::endl;
m_fd_last_error = r;
}
}
void Log::_flush_logbuf()
{
if (m_log_buf.size()) {
_log_safe_write(std::string_view(m_log_buf.data(), m_log_buf.size()));
m_log_buf.resize(0);
}
}
void Log::_flush(EntryVector& t, bool requeue, bool crash)
{
long len = 0;
if (crash) {
len = t.size();
}
if (!requeue && t.empty()) {
return;
}
for (auto& e : t) {
auto prio = e.m_prio;
auto stamp = e.m_stamp;
auto sub = e.m_subsys;
auto thread = e.m_thread;
auto str = e.strv();
bool should_log = crash || m_subs->get_log_level(sub) >= prio;
bool do_fd = m_fd >= 0 && should_log;
bool do_syslog = m_syslog_crash >= prio && should_log;
bool do_stderr = m_stderr_crash >= prio && should_log;
bool do_graylog2 = m_graylog_crash >= prio && should_log;
if (do_fd || do_syslog || do_stderr) {
const std::size_t cur = m_log_buf.size();
std::size_t used = 0;
const std::size_t allocated = e.size() + 80;
m_log_buf.resize(cur + allocated);
char* const start = m_log_buf.data();
char* pos = start + cur;
if (crash) {
used += (std::size_t)snprintf(pos + used, allocated - used, "%6ld> ", -(--len));
}
used += (std::size_t)append_time(stamp, pos + used, allocated - used);
used += (std::size_t)snprintf(pos + used, allocated - used, " %lx %2d ", (unsigned long)thread, prio);
memcpy(pos + used, str.data(), str.size());
used += str.size();
pos[used] = '\0';
ceph_assert((used + 1 /* '\n' */) < allocated);
if (do_syslog) {
syslog(LOG_USER|LOG_INFO, "%s", pos);
}
if (do_stderr) {
std::cerr << m_log_stderr_prefix << std::string_view(pos, used) << std::endl;
}
/* now add newline */
pos[used++] = '\n';
if (do_fd) {
m_log_buf.resize(cur + used);
} else {
m_log_buf.resize(0);
}
if (m_log_buf.size() > MAX_LOG_BUF) {
_flush_logbuf();
}
}
if (do_graylog2 && m_graylog) {
m_graylog->log_entry(e);
}
if (requeue) {
m_recent.push_back(std::move(e));
}
}
t.clear();
_flush_logbuf();
}
void Log::_log_message(const char *s, bool crash)
{
if (m_fd >= 0) {
size_t len = strlen(s);
std::string b;
b.reserve(len + 1);
b.append(s, len);
b += '\n';
int r = safe_write(m_fd, b.c_str(), b.size());
if (r < 0)
std::cerr << "problem writing to " << m_log_file << ": " << cpp_strerror(r) << std::endl;
}
if ((crash ? m_syslog_crash : m_syslog_log) >= 0) {
syslog(LOG_USER|LOG_INFO, "%s", s);
}
if ((crash ? m_stderr_crash : m_stderr_log) >= 0) {
std::cerr << s << std::endl;
}
}
void Log::dump_recent()
{
std::scoped_lock lock1(m_flush_mutex);
m_flush_mutex_holder = pthread_self();
{
std::scoped_lock lock2(m_queue_mutex);
m_queue_mutex_holder = pthread_self();
assert(m_flush.empty());
m_flush.swap(m_new);
m_queue_mutex_holder = 0;
}
_flush(m_flush, true, false);
_flush_logbuf();
_log_message("--- begin dump of recent events ---", true);
{
EntryVector t;
t.insert(t.end(), std::make_move_iterator(m_recent.begin()), std::make_move_iterator(m_recent.end()));
m_recent.clear();
_flush(t, true, true);
}
char buf[4096];
_log_message("--- logging levels ---", true);
for (const auto& p : m_subs->m_subsys) {
snprintf(buf, sizeof(buf), " %2d/%2d %s", p.log_level, p.gather_level, p.name);
_log_message(buf, true);
}
sprintf(buf, " %2d/%2d (syslog threshold)", m_syslog_log, m_syslog_crash);
_log_message(buf, true);
sprintf(buf, " %2d/%2d (stderr threshold)", m_stderr_log, m_stderr_crash);
_log_message(buf, true);
sprintf(buf, " max_recent %9zu", m_max_recent);
_log_message(buf, true);
sprintf(buf, " max_new %9zu", m_max_new);
_log_message(buf, true);
sprintf(buf, " log_file %s", m_log_file.c_str());
_log_message(buf, true);
_log_message("--- end dump of recent events ---", true);
_flush_logbuf();
m_flush_mutex_holder = 0;
}
void Log::start()
{
ceph_assert(!is_started());
{
std::scoped_lock lock(m_queue_mutex);
m_stop = false;
}
create("log");
}
void Log::stop()
{
if (is_started()) {
{
std::scoped_lock lock(m_queue_mutex);
m_stop = true;
m_cond_flusher.notify_one();
m_cond_loggers.notify_all();
}
join();
}
}
void *Log::entry()
{
reopen_log_file();
{
std::unique_lock lock(m_queue_mutex);
m_queue_mutex_holder = pthread_self();
while (!m_stop) {
if (!m_new.empty()) {
m_queue_mutex_holder = 0;
lock.unlock();
flush();
lock.lock();
m_queue_mutex_holder = pthread_self();
continue;
}
m_cond_flusher.wait(lock);
}
m_queue_mutex_holder = 0;
}
flush();
return NULL;
}
bool Log::is_inside_log_lock()
{
return
pthread_self() == m_queue_mutex_holder ||
pthread_self() == m_flush_mutex_holder;
}
void Log::inject_segv()
{
m_inject_segv = true;
}
void Log::reset_segv()
{
m_inject_segv = false;
}
} // ceph::logging::
} // ceph::
|