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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "pg_meta.h"
#include <string_view>
#include "crimson/os/futurized_collection.h"
#include "crimson/os/futurized_store.h"
// prefix pgmeta_oid keys with _ so that PGLog::read_log_and_missing() can
// easily skip them
using crimson::os::FuturizedStore;
PGMeta::PGMeta(FuturizedStore* store, spg_t pgid)
: store{store},
pgid{pgid}
{}
namespace {
template<typename T>
std::optional<T> find_value(const FuturizedStore::omap_values_t& values,
string_view key)
{
auto found = values.find(key);
if (found == values.end()) {
return {};
}
auto p = found->second.cbegin();
T value;
decode(value, p);
return std::make_optional(std::move(value));
}
}
seastar::future<epoch_t> PGMeta::get_epoch()
{
return store->open_collection(coll_t{pgid}).then([this](auto ch) {
return store->omap_get_values(ch,
pgid.make_pgmeta_oid(),
{string{infover_key},
string{epoch_key}}).safe_then(
[](auto&& values) {
{
// sanity check
auto infover = find_value<__u8>(values, infover_key);
assert(infover);
if (*infover < 10) {
throw std::runtime_error("incompatible pg meta");
}
}
{
auto epoch = find_value<epoch_t>(values, epoch_key);
assert(epoch);
return seastar::make_ready_future<epoch_t>(*epoch);
}
},
FuturizedStore::read_errorator::assert_all{
"PGMeta::get_epoch: unable to read pgmeta"
});
});
}
seastar::future<std::tuple<pg_info_t, PastIntervals>> PGMeta::load()
{
return store->open_collection(coll_t{pgid}).then([this](auto ch) {
return store->omap_get_values(ch,
pgid.make_pgmeta_oid(),
{string{infover_key},
string{info_key},
string{biginfo_key},
string{fastinfo_key}});
}).safe_then([](auto&& values) {
{
// sanity check
auto infover = find_value<__u8>(values, infover_key);
assert(infover);
if (infover < 10) {
throw std::runtime_error("incompatible pg meta");
}
}
pg_info_t info;
{
auto found = find_value<pg_info_t>(values, info_key);
assert(found);
info = *std::move(found);
}
PastIntervals past_intervals;
{
using biginfo_t = std::pair<PastIntervals, decltype(info.purged_snaps)>;
auto big_info = find_value<biginfo_t>(values, biginfo_key);
assert(big_info);
past_intervals = std::move(big_info->first);
info.purged_snaps = std::move(big_info->second);
}
{
auto fast_info = find_value<pg_fast_info_t>(values, fastinfo_key);
if (fast_info) {
fast_info->try_apply_to(&info);
}
}
return seastar::make_ready_future<std::tuple<pg_info_t, PastIntervals>>(
std::make_tuple(std::move(info), std::move(past_intervals)));
},
FuturizedStore::read_errorator::assert_all{
"PGMeta::load: unable to read pgmeta"
});
}
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