/usr/include/ktulog.h is in libkyototycoon-dev 0.9.56-1.
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* Update logger
* Copyright (C) 2009-2012 FAL Labs
* This file is part of Kyoto Tycoon.
* This program is free software: you can redistribute it and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation, either version
* 3 of the License, or any later version.
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along with this program.
* If not, see <http://www.gnu.org/licenses/>.
*************************************************************************************************/
#ifndef _KTULOG_H // duplication check
#define _KTULOG_H
#include <ktcommon.h>
#include <ktutil.h>
#define KTULPATHEXT "ulog" ///< extension of each file
namespace kyototycoon { // common namespace
/**
* Update logger.
*/
class UpdateLogger {
public:
class Reader;
struct FileStatus;
private:
struct Log;
/** An alias of cached logs. */
typedef std::vector<Log> Cache;
/* The maximum size of cached logs. */
static const size_t CACHEMAX = 65536;
/* The magic data for meta data. */
static const uint8_t METAMAGIC = 0xa0;
/* The magic data for beginning mark. */
static const uint8_t BEGMAGIC = 0xa1;
/* The magic data for ending mark. */
static const uint8_t ENDMAGIC = 0xa2;
/* The accuracy of wall clock time stamp. */
static const uint64_t TSWACC = 1000;
/* The accuracy of logical time stamp. */
static const uint64_t TSLACC = 1000 * 1000;
/* The waiting seconds of auto flush. */
static const double FLUSHWAIT = 0.1;
public:
/**
* Reader of update logs.
*/
class Reader {
public:
/**
* Default constructor.
*/
explicit Reader() : ulog_(NULL), ts_(0), id_(0), file_(), off_(0) {
_assert_(true);
}
/**
* Destructor.
*/
~Reader() {
_assert_(true);
if (ulog_) close();
}
/**
* Open the reader.
* @param ulog the update logger.
* @param ts the maximum time stamp of already read logs.
* @return true on success, or false on failure.
*/
bool open(UpdateLogger* ulog, uint64_t ts = 0) {
_assert_(ulog);
if (ulog_) return false;
ulog_ = ulog;
ts_ = ts;
id_ = 0;
std::vector<std::string> names;
kc::File::read_directory(ulog_->path_, &names);
std::sort(names.begin(), names.end(), std::greater<std::string>());
std::vector<std::string>::iterator it = names.begin();
std::vector<std::string>::iterator itend = names.end();
uint32_t lid = 0;
std::string ext;
kc::strprintf(&ext, "%c%s", kc::File::EXTCHR, KTULPATHEXT);
while (it != itend && id_ < 1) {
const std::string& path = ulog_->path_ + kc::File::PATHCHR + *it;
if (kc::strbwm(path, ext) &&
file_.open(path, kc::File::OREADER | kc::File::ONOLOCK, 0)) {
ulog_->flock_.lock_reader();
uint32_t cid = kc::atoi(it->c_str());
if (file_.refresh()) {
int64_t fsiz;
uint64_t fts;
if (read_meta(&fsiz, &fts) && fts + TSWACC * TSLACC < ts) id_ = lid;
}
ulog_->flock_.unlock();
file_.close();
lid = cid;
}
++it;
}
if (id_ < 1) id_ = lid > 0 ? lid : 1;
ulog_->flock_.lock_reader();
const std::string& path = ulog_->generate_path(id_);
if (!file_.open(path, kc::File::OREADER | kc::File::ONOLOCK, 0)) {
ulog_->flock_.unlock();
ulog_ = NULL;
return false;
}
int64_t fsiz;
uint64_t fts;
if (!read_meta(&fsiz, &fts)) {
file_.close();
ulog_->flock_.unlock();
ulog_ = NULL;
return false;
}
ulog_->flock_.unlock();
read_skip(ts);
return true;
}
/**
* Close the reader.
*/
bool close() {
_assert_(true);
if (!ulog_) return false;
bool err = false;
if (!file_.close()) err = true;
ulog_ = NULL;
return !err;
}
/**
* Read the next message.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param tsp the pointer to the variable into which the time stamp is assigned.
* @return the pointer to the region of the message, or NULL on failure. Because the region
* of the return value is allocated with the the new[] operator, it should be released with
* the delete[] operator when it is no longer in use.
*/
char* read(size_t* sp, uint64_t* tsp) {
_assert_(sp && tsp);
if (!ulog_) return NULL;
ulog_->flock_.lock_reader();
char* mbuf = read_impl(sp, tsp);
ulog_->flock_.unlock();
if (!mbuf) return NULL;
if (*tsp <= ts_) {
delete[] mbuf;
return NULL;
}
return mbuf;
}
private:
/**
* Read the meta data.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param tsp the pointer to the variable into which the time stamp is assigned.
* @return true on success, or false on failure.
*/
bool read_meta(int64_t* sp, uint64_t* tsp) {
_assert_(sp && tsp);
char hbuf[1+sizeof(uint64_t)+sizeof(uint64_t)];
int64_t psiz = file_.size();
if (psiz < (int64_t)sizeof(hbuf) || !file_.read(0, hbuf, sizeof(hbuf))) return false;
const char* rp = hbuf;
if (*(uint8_t*)(rp++) != METAMAGIC) return false;
int64_t fsiz = kc::readfixnum(rp, sizeof(uint64_t));
rp += sizeof(uint64_t);
uint64_t fts = kc::readfixnum(rp, sizeof(uint64_t));
if (psiz < fsiz) return false;
*sp = fsiz;
*tsp = fts;
off_ = sizeof(hbuf);
return true;
}
/**
* Read the next message.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param tsp the pointer to the variable into which the time stamp is assigned.
* @return the pointer to the region of the message, or NULL on failure.
*/
char* read_impl(size_t* sp, uint64_t* tsp) {
_assert_(sp && tsp);
*sp = 0;
*tsp = 0;
char buf[1+sizeof(uint64_t)+sizeof(uint32_t)];
if (!file_.refresh()) return NULL;
if (!file_.read(off_, buf, sizeof(buf))) {
bool ok = false;
int64_t nid = id_ + 1;
while (nid <= ulog_->id_) {
const std::string& path = ulog_->generate_path(nid);
if (kc::File::status(path)) {
if (!file_.close()) return NULL;
if (!file_.open(path, kc::File::OREADER | kc::File::ONOLOCK, 0)) return NULL;
int64_t fsiz;
uint64_t fts;
if (!read_meta(&fsiz, &fts)) return NULL;
id_ = nid;
if (!file_.read(off_, buf, sizeof(buf))) return NULL;
ok = true;
break;
}
nid++;
}
if (!ok) return NULL;
}
int64_t noff = off_ + sizeof(buf);
const char* rp = buf;
if (*(uint8_t*)rp != BEGMAGIC) return NULL;
rp++;
uint64_t ts = kc::readfixnum(rp, sizeof(uint64_t));
rp += sizeof(uint64_t);
size_t msiz = kc::readfixnum(rp, sizeof(uint32_t));
char* mbuf = new char[msiz+1];
if (!file_.read(noff, mbuf, msiz + 1) || ((uint8_t*)mbuf)[msiz] != ENDMAGIC) {
delete[] mbuf;
return NULL;
}
off_ = noff + msiz + 1;
*sp = msiz;
*tsp = ts;
return mbuf;
}
/**
* Read and skip messages until a time stamp.
* @param ts the time stamp.
*/
void read_skip(uint64_t ts) {
_assert_(true);
while (true) {
uint32_t oldid = id_;
int64_t oldoff = off_;
ulog_->flock_.lock_reader();
size_t msiz;
uint64_t mts;
char* mbuf = read_impl(&msiz, &mts);
ulog_->flock_.unlock();
if (mbuf) {
delete[] mbuf;
if (mts > ts) {
if (id_ == oldid) {
off_ = oldoff;
} else {
off_ = 1 + sizeof(uint64_t) + sizeof(uint64_t);
}
break;
}
} else {
break;
}
}
}
/** The update logger. */
UpdateLogger* ulog_;
/** The current time stamp. */
uint64_t ts_;
/** The current ID number. */
uint32_t id_;
/** The current file. */
kc::File file_;
/** The current offset. */
int64_t off_;
};
/**
* Status of each log file.
*/
struct FileStatus {
std::string path; ///< path
uint64_t size; ///< file size
uint64_t ts; ///< maximum time stamp
};
/**
* Default constructor.
*/
explicit UpdateLogger() :
path_(), limsiz_(0), asi_(0), id_(0), file_(),
cache_(), csiz_(0), cts_(0), clock_(), flock_(), tslock_(),
flusher_(this), tswall_(0), tslogic_(0) {
_assert_(true);
}
/**
* Destructor.
*/
~UpdateLogger() {
_assert_(true);
if (!path_.empty()) close();
}
/**
* Open the logger.
* @param path the path of the base directory.
* @param limsiz the limit size of each log file. If it is not more than 0, no limit is
* specified. If it is kyotocabinet::INT64MIN, the logger is opened as reader.
* @param asi the interval of auto synchronization. If it is not more than 0, auto
* synchronization is not performed.
* @return true on success, or false on failure.
*/
bool open(const std::string& path, int64_t limsiz = -1, double asi = -1) {
_assert_(true);
if (!path_.empty()) return false;
size_t psiz = path.size();
while (psiz > 0 && path[psiz-1] == kc::File::PATHCHR) {
psiz--;
}
const std::string& cpath = path.substr(0, psiz);
kc::File::Status sbuf;
if (kc::File::status(cpath, &sbuf)) {
if (!sbuf.isdir) return false;
} else {
if (limsiz == kc::INT64MIN) return false;
if (!kc::File::make_directory(cpath)) return false;
}
kc::DirStream dir;
if (!dir.open(cpath)) return false;
uint32_t id = 0;
std::string name;
while (dir.read(&name)) {
const char* nstr = name.c_str();
if (check_name(nstr)) {
int64_t num = kc::atoi(nstr);
if (num > id) id = num;
}
}
path_ = cpath;
limsiz_ = limsiz > 0 ? limsiz : kc::INT64MAX;
asi_ = asi;
id_ = id > 0 ? id : 1;
const std::string& tpath = generate_path(id_);
if (limsiz == kc::INT64MIN) {
if (!file_.open(tpath, kc::File::OREADER | kc::File::ONOLOCK, 0)) {
path_.clear();
return false;
}
} else {
if (!file_.open(tpath, kc::File::OWRITER | kc::File::OCREATE, 0)) {
path_.clear();
return false;
}
if (file_.size() < 1 && !write_meta()) {
file_.close();
path_.clear();
return false;
}
if (!validate_meta()) {
file_.close();
path_.clear();
return false;
}
}
flusher_.start();
return true;
}
/**
* Close the logger.
* @return true on success, or false on failure.
*/
bool close() {
_assert_(true);
if (path_.empty()) return false;
bool err = false;
flusher_.stop();
flusher_.join();
if (flusher_.error()) err = true;
if (csiz_ > 0 && !flush()) err = true;
if (!file_.close()) err = true;
path_.clear();
return !err;
}
/**
* Write a log message.
* @param mbuf the pointer to the message region.
* @param msiz the size of the message region.
* @param ts the time stamp of the message. If it is not more than 0, the current time stamp
* is specified.
* @return true on success, or false on failure.
*/
bool write(const char* mbuf, size_t msiz, uint64_t ts = 0) {
_assert_(mbuf && msiz <= kc::MEMMAXSIZ);
char* nbuf = new char[msiz];
std::memcpy(nbuf, mbuf, msiz);
return write_volatile(nbuf, msiz, ts);
}
/**
* Write a log message with a volatile buffer.
* @param mbuf the pointer to the message region which is allocated by the new[] operator.
* @param msiz the size of the message region.
* @param ts the time stamp of the message. If it is not more than 0, the current time stamp
* is specified.
* @return true on success, or false on failure.
* @note the message region is to be deleted inside this object implicitly.
*/
bool write_volatile(char* mbuf, size_t msiz, uint64_t ts = 0) {
_assert_(mbuf && msiz <= kc::MEMMAXSIZ);
if (path_.empty()) return false;
kc::ScopedSpinLock lock(&clock_);
if (ts < 1) ts = clock_impl();
bool err = false;
Log log = { mbuf, msiz, ts };
cache_.push_back(log);
csiz_ += 2 + sizeof(uint64_t) + sizeof(uint32_t) + msiz;
if (ts > cts_) cts_ = ts;
if (csiz_ > CACHEMAX && !flush()) err = true;
return !err;
}
/**
* Write multiple log messages at once.
* @param mvec a string vector of log messages.
* @param ts the time stamp of the message. If it is not more than 0, the current time stamp
* is specified.
* @return true on success, or false on failure.
*/
bool write_bulk(const std::vector<std::string>& mvec, uint64_t ts = 0) {
if (path_.empty()) return false;
kc::ScopedSpinLock lock(&clock_);
bool err = false;
std::vector<std::string>::const_iterator it = mvec.begin();
std::vector<std::string>::const_iterator itend = mvec.end();
while (it != itend) {
size_t msiz = it->size();
char* mbuf = new char[msiz];
std::memcpy(mbuf, it->data(), msiz);
uint64_t mts = ts > 0 ? ts : clock_impl();
Log log = { mbuf, msiz, mts };
cache_.push_back(log);
csiz_ += 2 + sizeof(uint64_t) + sizeof(uint32_t) + msiz;
if (mts > cts_) cts_ = mts;
++it;
}
if (csiz_ > CACHEMAX && !flush()) err = true;
return !err;
}
/**
* Get the current clock data for time stamp.
* @return the current clock data for time stamp.
*/
uint64_t clock() {
_assert_(true);
kc::ScopedSpinLock lock(&tslock_);
return clock_impl();
}
/**
* Get status of each log files.
* @param fstvec a vector to store status structures of each log files.
*/
void list_files(std::vector<FileStatus>* fstvec) {
_assert_(fstvec);
if (path_.empty()) return;
fstvec->clear();
std::vector<std::string> names;
kc::File::read_directory(path_, &names);
std::sort(names.begin(), names.end());
std::vector<std::string>::iterator it = names.begin();
std::vector<std::string>::iterator itend = names.end();
while (it != itend) {
const std::string& path = path_ + kc::File::PATHCHR + *it;
kc::File file;
if (file.open(path, kc::File::OREADER | kc::File::ONOLOCK, 0)) {
flock_.lock_reader();
if (file.refresh()) {
char hbuf[1+sizeof(uint64_t)+sizeof(uint64_t)];
int64_t psiz = file.size();
if (psiz >= (int64_t)sizeof(hbuf) && file.read(0, hbuf, sizeof(hbuf))) {
const char* rp = hbuf;
if (*(uint8_t*)(rp++) == METAMAGIC) {
int64_t fsiz = kc::readfixnum(rp, sizeof(uint64_t));
rp += sizeof(uint64_t);
uint64_t fts = kc::readfixnum(rp, sizeof(uint64_t));
FileStatus fs = { path, fsiz, fts };
fstvec->push_back(fs);
}
}
}
flock_.unlock();
file.close();
}
++it;
}
}
/**
* Get the current pure clock data for time stamp.
* @return the current pure clock data for time stamp.
*/
static uint64_t clock_pure() {
return (uint64_t)(kc::time() * TSWACC) * TSLACC;
}
private:
/**
* Log message.
*/
struct Log {
char* mbuf; ///< pointer to the message
size_t msiz; ///< size of the message
uint64_t ts; ///< time stamp
};
/**
* Automatic flusher of cacheed logs.
*/
class AutoFlusher : public kc::Thread {
public:
AutoFlusher(UpdateLogger* ulog) : ulog_(ulog), alive_(true), error_(false) {}
void run() {
double asnext = 0;
while (alive_ && !error_) {
kc::Thread::sleep(FLUSHWAIT);
if (ulog_->clock_.lock_try()) {
if (ulog_->csiz_ > 0 && !ulog_->flush()) error_ = true;
ulog_->clock_.unlock();
}
if (ulog_->asi_ > 0 && kc::time() >= asnext) {
ulog_->clock_.lock();
ulog_->file_.synchronize(true);
ulog_->clock_.unlock();
asnext = kc::time() + ulog_->asi_;
}
}
}
void stop() {
alive_ = false;
}
bool error() {
return error_;
}
private:
UpdateLogger* ulog_;
bool alive_;
bool error_;
};
/**
* Check whether a file name is for update log.
* @param name the file name.
* @return true for update log, or false if not.
*/
bool check_name(const char* name) {
_assert_(name);
const char* pv = std::strchr(name, kc::File::PATHCHR);
if (pv) name = pv + 1;
const char* bp = name;
while (*name != '\0') {
if (*name == kc::File::EXTCHR) {
if (name - bp != 10) return false;
return !std::strcmp(name + 1, KTULPATHEXT);
}
if (*name < '0' || *name > '9') return false;
name++;
}
return false;
}
/**
* Generate the path of a update log file.
* @param id the ID number of the file.
* @return the path of the file.
*/
std::string generate_path(uint32_t id) {
_assert_(true);
return kc::strprintf("%s%c%010u%c%s", path_.c_str(), kc::File::PATHCHR,
id, kc::File::EXTCHR, KTULPATHEXT);
}
/**
* Write meta data.
* @return true on success, or false on failure.
*/
bool write_meta() {
_assert_(true);
char hbuf[1+sizeof(uint64_t)+sizeof(uint64_t)];
char* wp = hbuf;
*(wp++) = METAMAGIC;
int64_t psiz = file_.size();
if (psiz < (int64_t)sizeof(hbuf)) psiz = sizeof(hbuf);
kc::writefixnum(wp, psiz, sizeof(uint64_t));
wp += sizeof(uint64_t);
kc::writefixnum(wp, cts_, sizeof(uint64_t));
return file_.write(0, hbuf, sizeof(hbuf));
}
/**
* Validate the meta data.
* @return true on success, or false on failure.
*/
bool validate_meta() {
_assert_(true);
char hbuf[1+sizeof(uint64_t)+sizeof(uint64_t)];
int64_t psiz = file_.size();
if (psiz < (int64_t)sizeof(hbuf) || !file_.read(0, hbuf, sizeof(hbuf))) return false;
const char* rp = hbuf;
if (*(uint8_t*)(rp++) != METAMAGIC) return false;
int64_t fsiz = kc::readfixnum(rp, sizeof(uint64_t));
rp += sizeof(uint64_t);
uint64_t fts = kc::readfixnum(rp, sizeof(uint64_t));
if (psiz < fsiz || fsiz < (int64_t)sizeof(hbuf)) return false;
if (psiz > fsiz && !file_.truncate(fsiz)) return false;
tswall_ = fts / TSLACC + 1;
return true;
}
/**
* Flush cached logs into a file.
* @return true on success, or false on failure.
*/
bool flush() {
_assert_(true);
bool err = false;
flock_.lock_writer();
if (file_.size() >= limsiz_) {
if (asi_ > 0 && !file_.synchronize(true)) err = true;
if (!file_.close()) err = true;
id_++;
const std::string& tpath = generate_path(id_);
if (!file_.open(tpath, kc::File::OWRITER | kc::File::OCREATE | kc::File::OTRUNCATE, 0))
err = true;
if (!write_meta()) err = true;
}
char* cbuf = new char[csiz_];
char* wp = cbuf;
Cache::iterator it = cache_.begin();
Cache::iterator itend = cache_.end();
while (it != itend) {
Log log = *it;
*(wp++) = BEGMAGIC;
kc::writefixnum(wp, log.ts, sizeof(uint64_t));
wp += sizeof(uint64_t);
kc::writefixnum(wp, log.msiz, sizeof(uint32_t));
wp += sizeof(uint32_t);
std::memcpy(wp, log.mbuf, log.msiz);
wp += log.msiz;
*(wp++) = ENDMAGIC;
delete[] log.mbuf;
++it;
}
if (!file_.append(cbuf, csiz_)) err = true;
if (!err && !write_meta()) err = true;
delete[] cbuf;
cache_.clear();
csiz_ = 0;
flock_.unlock();
return !err;
}
/**
* Get the current clock data for time stamp.
* @return the current clock data for time stamp.
*/
uint64_t clock_impl() {
_assert_(true);
uint64_t ct = kc::time() * TSWACC;
if (ct > tswall_) {
tswall_ = ct;
tslogic_ = 0;
} else {
tslogic_++;
}
return tswall_ * TSLACC + tslogic_;
}
/** Dummy constructor to forbid the use. */
UpdateLogger(const UpdateLogger&);
/** Dummy Operator to forbid the use. */
UpdateLogger& operator =(const UpdateLogger&);
/** The path of the base directory. */
std::string path_;
/** The limit size of each file. */
int64_t limsiz_;
/** The inverval of auto synchronization. */
double asi_;
/** The ID number of the current file. */
uint32_t id_;
/** The current file. */
kc::File file_;
/** The cached logs. */
Cache cache_;
/** The size of the cache. */
size_t csiz_;
/** The last time stamp in the cache. */
uint64_t cts_;
/** The cache lock. */
kc::SpinLock clock_;
/** The file lock. */
kc::SpinRWLock flock_;
/** The time stamp lock. */
kc::SpinLock tslock_;
/** The automatic flusher. */
AutoFlusher flusher_;
/** The wall clock time stamp. */
uint64_t tswall_;
/** The logical time stamp. */
uint64_t tslogic_;
};
} // common namespace
#endif // duplication check
// END OF FILE
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