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77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
#include <Functions/IFunction.h>
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#include <Functions/FunctionFactory.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Interpreters/Context.h>
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#include <filesystem>
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#include <Poco/Util/AbstractConfiguration.h>
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namespace DB
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{
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namespace
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{
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struct FilesystemAvailable
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{
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static constexpr auto name = "filesystemAvailable";
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static std::uintmax_t get(const std::filesystem::space_info & spaceinfo) { return spaceinfo.available; }
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};
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struct FilesystemFree
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{
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static constexpr auto name = "filesystemFree";
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static std::uintmax_t get(const std::filesystem::space_info & spaceinfo) { return spaceinfo.free; }
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};
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struct FilesystemCapacity
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{
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static constexpr auto name = "filesystemCapacity";
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static std::uintmax_t get(const std::filesystem::space_info & spaceinfo) { return spaceinfo.capacity; }
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};
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template <typename Impl>
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class FilesystemImpl : public IFunction
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{
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public:
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static constexpr auto name = Impl::name;
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static FunctionPtr create(ContextPtr context)
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{
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return std::make_shared<FilesystemImpl<Impl>>(std::filesystem::space(context->getConfigRef().getString("path")));
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}
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override
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{
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return false;
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}
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explicit FilesystemImpl(std::filesystem::space_info spaceinfo_) : spaceinfo(spaceinfo_) { }
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String getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 0; }
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bool isDeterministic() const override { return false; }
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DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
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{
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return std::make_shared<DataTypeUInt64>();
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
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{
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return DataTypeUInt64().createColumnConst(input_rows_count, static_cast<UInt64>(Impl::get(spaceinfo)));
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}
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private:
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std::filesystem::space_info spaceinfo;
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};
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}
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void registerFunctionFilesystem(FunctionFactory & factory)
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{
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factory.registerFunction<FilesystemImpl<FilesystemAvailable>>();
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factory.registerFunction<FilesystemImpl<FilesystemCapacity>>();
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factory.registerFunction<FilesystemImpl<FilesystemFree>>();
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}
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}
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