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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2020 Red Hat, Inc
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*/
#include "rgw_sync_error_repo.h"
#include "rgw_coroutine.h"
#include "rgw_sal.h"
#include "services/svc_rados.h"
#include "cls/cmpomap/client.h"
namespace rgw::error_repo {
// prefix for the binary encoding of keys. this particular value is not
// valid as the first byte of a utf8 code point, so we use this to
// differentiate the binary encoding from existing string keys for
// backward-compatibility
constexpr uint8_t binary_key_prefix = 0x80;
struct key_type {
rgw_bucket_shard bs;
std::optional<uint64_t> gen;
};
void encode(const key_type& k, bufferlist& bl, uint64_t f=0)
{
ENCODE_START(1, 1, bl);
encode(k.bs, bl);
encode(k.gen, bl);
ENCODE_FINISH(bl);
}
void decode(key_type& k, bufferlist::const_iterator& bl)
{
DECODE_START(1, bl);
decode(k.bs, bl);
decode(k.gen, bl);
DECODE_FINISH(bl);
}
std::string encode_key(const rgw_bucket_shard& bs,
std::optional<uint64_t> gen)
{
using ceph::encode;
const auto key = key_type{bs, gen};
bufferlist bl;
encode(binary_key_prefix, bl);
encode(key, bl);
return bl.to_str();
}
int decode_key(std::string encoded,
rgw_bucket_shard& bs,
std::optional<uint64_t>& gen)
{
using ceph::decode;
key_type key;
const auto bl = bufferlist::static_from_string(encoded);
auto p = bl.cbegin();
try {
uint8_t prefix;
decode(prefix, p);
if (prefix != binary_key_prefix) {
return -EINVAL;
}
decode(key, p);
} catch (const buffer::error&) {
return -EIO;
}
if (!p.end()) {
return -EIO; // buffer contained unexpected bytes
}
bs = std::move(key.bs);
gen = key.gen;
return 0;
}
ceph::real_time decode_value(const bufferlist& bl)
{
uint64_t value;
try {
using ceph::decode;
decode(value, bl);
} catch (const buffer::error&) {
value = 0; // empty buffer = 0
}
return ceph::real_clock::zero() + ceph::timespan(value);
}
int write(librados::ObjectWriteOperation& op,
const std::string& key,
ceph::real_time timestamp)
{
// overwrite the existing timestamp if value is greater
const uint64_t value = timestamp.time_since_epoch().count();
using namespace ::cls::cmpomap;
const bufferlist zero = u64_buffer(0); // compare against 0 for missing keys
return cmp_set_vals(op, Mode::U64, Op::GT, {{key, u64_buffer(value)}}, zero);
}
int remove(librados::ObjectWriteOperation& op,
const std::string& key,
ceph::real_time timestamp)
{
// remove the omap key if value >= existing
const uint64_t value = timestamp.time_since_epoch().count();
using namespace ::cls::cmpomap;
return cmp_rm_keys(op, Mode::U64, Op::GTE, {{key, u64_buffer(value)}});
}
class RGWErrorRepoWriteCR : public RGWSimpleCoroutine {
RGWSI_RADOS::Obj obj;
std::string key;
ceph::real_time timestamp;
boost::intrusive_ptr<RGWAioCompletionNotifier> cn;
public:
RGWErrorRepoWriteCR(RGWSI_RADOS* rados, const rgw_raw_obj& raw_obj,
const std::string& key, ceph::real_time timestamp)
: RGWSimpleCoroutine(rados->ctx()),
obj(rados->obj(raw_obj)),
key(key), timestamp(timestamp)
{}
int send_request(const DoutPrefixProvider *dpp) override {
librados::ObjectWriteOperation op;
int r = write(op, key, timestamp);
if (r < 0) {
return r;
}
r = obj.open(dpp);
if (r < 0) {
return r;
}
cn = stack->create_completion_notifier();
return obj.aio_operate(cn->completion(), &op);
}
int request_complete() override {
return cn->completion()->get_return_value();
}
};
RGWCoroutine* write_cr(RGWSI_RADOS* rados,
const rgw_raw_obj& obj,
const std::string& key,
ceph::real_time timestamp)
{
return new RGWErrorRepoWriteCR(rados, obj, key, timestamp);
}
class RGWErrorRepoRemoveCR : public RGWSimpleCoroutine {
RGWSI_RADOS::Obj obj;
std::string key;
ceph::real_time timestamp;
boost::intrusive_ptr<RGWAioCompletionNotifier> cn;
public:
RGWErrorRepoRemoveCR(RGWSI_RADOS* rados, const rgw_raw_obj& raw_obj,
const std::string& key, ceph::real_time timestamp)
: RGWSimpleCoroutine(rados->ctx()),
obj(rados->obj(raw_obj)),
key(key), timestamp(timestamp)
{}
int send_request(const DoutPrefixProvider *dpp) override {
librados::ObjectWriteOperation op;
int r = remove(op, key, timestamp);
if (r < 0) {
return r;
}
r = obj.open(dpp);
if (r < 0) {
return r;
}
cn = stack->create_completion_notifier();
return obj.aio_operate(cn->completion(), &op);
}
int request_complete() override {
return cn->completion()->get_return_value();
}
};
RGWCoroutine* remove_cr(RGWSI_RADOS* rados,
const rgw_raw_obj& obj,
const std::string& key,
ceph::real_time timestamp)
{
return new RGWErrorRepoRemoveCR(rados, obj, key, timestamp);
}
} // namespace rgw::error_repo
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