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#include "IVolume.h"
#include <Common/StringUtils/StringUtils.h>
#include <Common/quoteString.h>
#include <memory>
namespace DB
{
namespace ErrorCodes
{
extern const int NO_ELEMENTS_IN_CONFIG;
extern const int EXCESSIVE_ELEMENT_IN_CONFIG;
}
VolumeLoadBalancing parseVolumeLoadBalancing(const String & config)
{
if (config == "round_robin")
return VolumeLoadBalancing::ROUND_ROBIN;
if (config == "least_used")
return VolumeLoadBalancing::LEAST_USED;
throw Exception(ErrorCodes::EXCESSIVE_ELEMENT_IN_CONFIG, "'{}' is not valid load_balancing value", config);
}
IVolume::IVolume(
String name_,
const Poco::Util::AbstractConfiguration & config,
const String & config_prefix,
DiskSelectorPtr disk_selector)
: name(std::move(name_))
, load_balancing(parseVolumeLoadBalancing(config.getString(config_prefix + ".load_balancing", "round_robin")))
{
Poco::Util::AbstractConfiguration::Keys keys;
config.keys(config_prefix, keys);
for (const auto & disk : keys)
{
if (startsWith(disk, "disk"))
{
auto disk_name = config.getString(config_prefix + "." + disk);
disks.push_back(disk_selector->get(disk_name));
}
}
if (disks.empty())
throw Exception(ErrorCodes::NO_ELEMENTS_IN_CONFIG, "Volume must contain at least one disk");
}
std::optional<UInt64> IVolume::getMaxUnreservedFreeSpace() const
{
std::optional<UInt64> res;
for (const auto & disk : disks)
{
auto disk_unreserved_space = disk->getUnreservedSpace();
if (!disk_unreserved_space)
return std::nullopt; /// There is at least one unlimited disk.
if (!res || *disk_unreserved_space > *res)
res = disk_unreserved_space;
}
return res;
}
}
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