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switchlog.C
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switchlog.C
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/*
** Copyright 2024 Double Precision, Inc.
** See COPYING for distribution information.
*/
#include "config.h"
#include "switchlog.H"
#include "log.H"
#include <sys/stat.h>
#include <iomanip>
#include <filesystem>
#include <string>
#include <string_view>
#include <locale>
#include <set>
#include <chrono>
#include <map>
#define FORMAT_TIMESPEC(tv) \
(tv).tv_sec << "." << std::setw(3) << std::setfill('0') \
<< (tv).tv_nsec / 1000000
void switchlog_start(const std::string &new_runlevel)
{
switchlog_start();
auto s=get_current_switchlog();
if (s)
{
auto ¤t_time=log_current_timespec();
(*s) << FORMAT_TIMESPEC(current_time)
<< "\tswitch\t" << new_runlevel << "\n" << std::flush;
}
}
void log_state_change_to_switchlog(const std::string &name,
const std::string_view &new_container_state)
{
auto switchlog=get_current_switchlog();
if (switchlog)
{
auto ¤t_time=log_current_timespec();
(*switchlog) << FORMAT_TIMESPEC(current_time)
<< "\t" << new_container_state
<< "\t" << name
<< "\n" << std::flush;
}
}
void switchlog_purge(const char *directory,
unsigned ndays,
std::function<void (std::string)> log_error)
{
std::error_code ec;
std::filesystem::create_directory(directory, ec);
chmod(directory, 0700);
std::set<std::filesystem::directory_entry> subdirs;
for (auto b=std::filesystem::directory_iterator{directory};
b != std::filesystem::directory_iterator{}; ++b)
{
auto &entry=*b;
if (!entry.is_directory())
{
if (!std::filesystem::remove(entry, ec))
{
log_error(std::string{entry.path()} + ": "
+ ec.message());
}
}
else
{
subdirs.insert(entry);
}
}
while (subdirs.size() > ndays)
{
auto p=subdirs.begin();
if (!std::filesystem::remove_all(*p, ec))
{
log_error(std::string{p->path()} + ": "
+ ec.message());
}
subdirs.erase(p);
}
}
static std::string logfilename(std::string_view directory)
{
std::string s;
s.reserve(directory.size() + 4);
s += directory;
s += "/log";
return s;
}
void switchlog_create(const char *directory, std::ofstream &o)
{
o.open(logfilename(directory));
}
void switchlog_save(const char *directory,
std::function<void (std::string)> log_error)
{
auto n=logfilename(directory);
std::error_code ec;
auto ftime=std::filesystem::last_write_time(n, ec);
if (ec != std::error_code{})
{
log_error(n + ": " + ec.message());
return;
}
auto s=std::chrono::file_clock::to_sys(ftime);
std::chrono::year_month_day ymd{
std::chrono::sys_days{std::chrono::floor<std::chrono::days>(s)}
};
std::ostringstream o;
o.imbue(std::locale{"C"});
auto timestamp=std::chrono::floor<std::chrono::seconds>(s)
.time_since_epoch().count();
auto tm=std::localtime(×tamp);
o << directory << "/" << std::put_time(tm, "%Y-%m-%d");
std::filesystem::create_directory(o.str(), ec);
o << "/" << timestamp;
std::filesystem::rename(n, o.str(), ec);
if (ec != std::error_code{})
{
log_error(o.str() + ": " + ec.message());
return;
}
}
static std::vector<std::string_view>
next_switchlog_line(std::istream &i, std::string &line)
{
std::vector<std::string_view> words;
if (std::getline(i, line))
{
for (auto b=line.begin(), e=line.end(); b != e; )
{
auto p=b;
b=std::find(b, e, '\t');
words.emplace_back(p, b);
if (b != e)
++b;
}
}
return words;
}
std::vector<enumerated_switchlog> enumerate_switchlogs(const char *directory)
{
std::vector<enumerated_switchlog> switchlogs;
std::string_view directory_str{directory};
for (auto b=std::filesystem::recursive_directory_iterator{directory};
b != std::filesystem::recursive_directory_iterator{}; ++b)
{
auto relative_path=
static_cast<std::string>(
b->path()
).substr(directory_str.size()+1);
if (relative_path.find('/') == relative_path.npos)
continue;
// Look for <timestamp> switch <runlevel> on the first line
std::ifstream i{b->path()};
std::string first_line;
auto words=next_switchlog_line(i, first_line);
if (words.size() != 3 || words[1] != "switch")
continue;
std::error_code ec;
auto ftime=std::filesystem::last_write_time(b->path(), ec);
if (ec != std::error_code{})
continue;
auto s=std::chrono::file_clock::to_sys(ftime);
auto timestamp=std::chrono::floor<std::chrono::seconds>(s)
.time_since_epoch().count();
switchlogs.push_back({b->path(),
{words[2].begin(),
words[2].end()}, timestamp});
}
std::sort(switchlogs.begin(), switchlogs.end(),
[]
(auto &a, auto &b)
{
auto t=a.log_end <=> b.log_end;
if (t != 0)
return t < 0;
return a.filename < b.filename;
});
return switchlogs;
}
analyzed_switchlog switchlog_analyze(const enumerated_switchlog &log)
{
analyzed_switchlog ret;
std::ifstream i{log.filename};
if (!i.is_open())
throw std::runtime_error{"Cannot open log file"};
std::string line;
std::unordered_map<std::string, state_timeline> containers;
while (1)
{
auto words=next_switchlog_line(i, line);
if (i.eof())
break;
if (words.size() < 3)
continue;
// First word: timestamp
std::istringstream i{std::string{words[0].begin(),
words[0].end()}};
i.imbue(std::locale{"C"});
elapsed_time timestamp;
if (!(i >> timestamp.seconds) || i.get() != '.' ||
!(i >> timestamp.milliseconds) ||
timestamp.milliseconds > 999)
continue;
// Third word: container name
std::string name{words[2].begin(), words[2].end()};
auto entry_iter=containers.try_emplace(name).first;
auto &entry=entry_iter->second;
// Second word: state
//
// Search ALL_STATE_LABELS for it, and let the label
// update_timeline.
[&]<typename ...T>
( std::tuple<T...>)
{
((words[1] == T::label.label ?
(T::label.update_timeline(entry, timestamp),
0):0), ...);
}(ALL_STATE_LABELS{});
// Is the goose now fully cooked?
if (!entry.final_label || !entry.completed)
continue;
// Make sense of the monotonic timestamps, by subtracting them.
analyzed_switchlog::container result{name, entry.final_label};
if (entry.scheduled)
{
result.waiting=
(entry.inprogress ? *entry.inprogress
: *entry.completed) - *entry.scheduled;
}
if (entry.inprogress)
{
result.elapsed= *entry.completed - *entry.inprogress;
}
ret.log.push_back(std::move(result));
containers.erase(entry_iter);
}
return ret;
}