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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "journal/Journaler.h"
#include "include/stringify.h"
#include "common/errno.h"
#include "journal/Entry.h"
#include "journal/FutureImpl.h"
#include "journal/JournalMetadata.h"
#include "journal/JournalPlayer.h"
#include "journal/JournalRecorder.h"
#include "journal/JournalTrimmer.h"
#include "journal/PayloadImpl.h"
#include "journal/ReplayHandler.h"
#include "cls/journal/cls_journal_client.h"
#include "cls/journal/cls_journal_types.h"
#define dout_subsys ceph_subsys_journaler
#undef dout_prefix
#define dout_prefix *_dout << "Journaler: "
namespace journal {
namespace {
static const std::string JOURNAL_HEADER_PREFIX = "journal.";
static const std::string JOURNAL_OBJECT_PREFIX = "journal_data.";
struct C_DeleteRecorder : public Context {
JournalRecorder *recorder;
Context *on_safe;
C_DeleteRecorder(JournalRecorder *_recorder, Context *_on_safe)
: recorder(_recorder), on_safe(_on_safe) {
}
virtual void finish(int r) {
delete recorder;
on_safe->complete(r);
}
};
} // anonymous namespace
using namespace cls::journal;
Journaler::Journaler(librados::IoCtx &header_ioctx, librados::IoCtx &data_ioctx,
const std::string &journal_id,
const std::string &client_id)
: m_client_id(client_id), m_metadata(NULL), m_player(NULL), m_recorder(NULL),
m_trimmer(NULL)
{
m_header_ioctx.dup(header_ioctx);
m_data_ioctx.dup(data_ioctx);
m_cct = reinterpret_cast<CephContext *>(m_header_ioctx.cct());
m_header_oid = JOURNAL_HEADER_PREFIX + journal_id;
m_object_oid_prefix = JOURNAL_OBJECT_PREFIX + journal_id + ".";
// TODO configurable commit interval
m_metadata = new JournalMetadata(m_header_ioctx, m_header_oid, m_client_id,
5);
m_metadata->get();
m_trimmer = new JournalTrimmer(m_data_ioctx, m_object_oid_prefix, m_metadata);
}
Journaler::~Journaler() {
if (m_metadata != NULL) {
m_metadata->put();
m_metadata = NULL;
}
delete m_trimmer;
assert(m_player == NULL);
assert(m_recorder == NULL);
}
void Journaler::init(Context *on_init) {
m_metadata->init(on_init);
}
int Journaler::create(uint8_t order, uint8_t splay_width) {
if (order > 64 || order < 12) {
lderr(m_cct) << "order must be in the range [12, 64]" << dendl;
return -EDOM;
}
if (splay_width == 0) {
return -EINVAL;
}
ldout(m_cct, 5) << "creating new journal: " << m_header_oid << dendl;
int r = client::create(m_header_ioctx, m_header_oid, order, splay_width);
if (r < 0) {
lderr(m_cct) << "failed to create journal: " << cpp_strerror(r) << dendl;
return r;
}
return 0;
}
int Journaler::remove() {
int r = m_trimmer->remove_objects();
if (r < 0) {
lderr(m_cct) << "failed to remove journal objects: " << cpp_strerror(r)
<< dendl;
return r;
}
r = m_header_ioctx.remove(m_header_oid);
if (r < 0) {
lderr(m_cct) << "failed to remove journal header: " << cpp_strerror(r)
<< dendl;
return r;
}
return 0;
}
int Journaler::register_client(const std::string &description) {
return m_metadata->register_client(description);
}
int Journaler::unregister_client() {
return m_metadata->unregister_client();
}
void Journaler::start_replay(ReplayHandler *replay_handler) {
create_player(replay_handler);
m_player->prefetch();
}
void Journaler::start_live_replay(ReplayHandler *replay_handler,
double interval) {
create_player(replay_handler);
m_player->prefetch_and_watch(interval);
}
bool Journaler::try_pop_front(Payload *payload) {
assert(m_player != NULL);
Entry entry;
ObjectSetPosition object_set_position;
if (!m_player->try_pop_front(&entry, &object_set_position)) {
return false;
}
*payload = Payload(new PayloadImpl(entry.get_data(), object_set_position));
return true;
}
void Journaler::stop_replay() {
assert(m_player != NULL);
m_player->unwatch();
delete m_player;
m_player = NULL;
}
void Journaler::update_commit_position(const Payload &payload) {
PayloadImplPtr payload_impl = payload.get_payload_impl();
m_trimmer->update_commit_position(payload_impl->get_object_set_position());
}
void Journaler::start_append() {
assert(m_recorder == NULL);
// TODO verify active object set >= current replay object set
// TODO configurable flush intervals
m_recorder = new JournalRecorder(m_data_ioctx, m_object_oid_prefix,
m_metadata, 0, 0, 0);
}
void Journaler::stop_append(Context *on_safe) {
assert(m_recorder != NULL);
flush(new C_DeleteRecorder(m_recorder, on_safe));
m_recorder = NULL;
}
Future Journaler::append(const std::string &tag, const bufferlist &payload_bl) {
return m_recorder->append(tag, payload_bl);
}
void Journaler::flush(Context *on_safe) {
m_recorder->flush(on_safe);
}
void Journaler::create_player(ReplayHandler *replay_handler) {
assert(m_player == NULL);
m_player = new JournalPlayer(m_data_ioctx, m_object_oid_prefix, m_metadata,
replay_handler);
}
} // namespace journal
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