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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "tools/rbd/ArgumentTypes.h"
#include "tools/rbd/Shell.h"
#include "tools/rbd/Utils.h"
#include "include/rbd_types.h"
#include "librbd/WatchNotifyTypes.h"
#include "common/errno.h"
#include <iostream>
#include <boost/program_options.hpp>
namespace rbd {
namespace action {
namespace watch {
namespace at = argument_types;
namespace po = boost::program_options;
class RbdWatchCtx : public librados::WatchCtx2 {
public:
RbdWatchCtx(librados::IoCtx& io_ctx, const char *image_name,
const std::string &header_oid)
: m_io_ctx(io_ctx), m_image_name(image_name), m_header_oid(header_oid)
{
}
~RbdWatchCtx() override {}
void handle_notify(uint64_t notify_id,
uint64_t cookie,
uint64_t notifier_id,
bufferlist& bl) override {
using namespace librbd::watch_notify;
NotifyMessage notify_message;
if (bl.length() == 0) {
notify_message = NotifyMessage(new HeaderUpdatePayload());
} else {
try {
auto iter = bl.cbegin();
notify_message.decode(iter);
} catch (const buffer::error &err) {
std::cerr << "rbd: failed to decode image notification" << std::endl;
}
}
std::cout << m_image_name << " received notification: notify_id="
<< notify_id << ", cookie=" << cookie << ", notifier_id="
<< notifier_id << ", bl.length=" << bl.length() << ", notify_op="
<< notify_message.get_notify_op() << std::endl;
bufferlist reply;
m_io_ctx.notify_ack(m_header_oid, notify_id, cookie, reply);
}
void handle_error(uint64_t cookie, int err) override {
std::cerr << m_image_name << " received error: cookie=" << cookie << ", "
<< "err=" << cpp_strerror(err) << std::endl;
}
private:
librados::IoCtx m_io_ctx;
const char *m_image_name;
std::string m_header_oid;
};
static int do_watch(librados::IoCtx& pp, librbd::Image &image,
const char *imgname)
{
uint8_t old_format;
int r = image.old_format(&old_format);
if (r < 0) {
std::cerr << "failed to query format" << std::endl;
return r;
}
std::string header_oid;
if (old_format != 0) {
header_oid = std::string(imgname) + RBD_SUFFIX;
} else {
std::string id;
r = image.get_id(&id);
if (r < 0) {
return r;
}
header_oid = RBD_HEADER_PREFIX + id;
}
uint64_t cookie;
RbdWatchCtx ctx(pp, imgname, header_oid);
r = pp.watch2(header_oid, &cookie, &ctx);
if (r < 0) {
std::cerr << "rbd: watch failed" << std::endl;
return r;
}
std::cout << "press enter to exit..." << std::endl;
getchar();
r = pp.unwatch2(cookie);
if (r < 0) {
std::cerr << "rbd: unwatch failed" << std::endl;
return r;
}
return 0;
}
void get_arguments(po::options_description *positional,
po::options_description *options) {
at::add_image_spec_options(positional, options, at::ARGUMENT_MODIFIER_NONE);
}
int execute(const po::variables_map &vm,
const std::vector<std::string> &ceph_global_init_args) {
size_t arg_index = 0;
std::string pool_name;
std::string namespace_name;
std::string image_name;
std::string snap_name;
int r = utils::get_pool_image_snapshot_names(
vm, at::ARGUMENT_MODIFIER_NONE, &arg_index, &pool_name, &namespace_name,
&image_name, &snap_name, true, utils::SNAPSHOT_PRESENCE_NONE,
utils::SPEC_VALIDATION_NONE);
if (r < 0) {
return r;
}
librados::Rados rados;
librados::IoCtx io_ctx;
librbd::Image image;
r = utils::init_and_open_image(pool_name, namespace_name, image_name, "", "",
true, &rados, &io_ctx, &image);
if (r < 0) {
return r;
}
r = do_watch(io_ctx, image, image_name.c_str());
if (r < 0) {
std::cerr << "rbd: watch failed: " << cpp_strerror(r) << std::endl;
return r;
}
return 0;
}
Shell::Action action(
{"watch"}, {}, "Watch events on image.", "", &get_arguments, &execute);
} // namespace watch
} // namespace action
} // namespace rbd
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