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102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
#include <unistd.h>
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#include <Functions/IFunctionImpl.h>
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#include <Functions/FunctionHelpers.h>
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#include <Columns/ColumnConst.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Common/FieldVisitors.h>
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#include <Common/assert_cast.h>
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#include <common/sleep.h>
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#include <IO/WriteHelpers.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int TOO_SLOW;
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extern const int ILLEGAL_COLUMN;
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extern const int BAD_ARGUMENTS;
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}
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/** sleep(seconds) - the specified number of seconds sleeps each block.
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*/
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enum class FunctionSleepVariant
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{
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PerBlock,
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PerRow
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};
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template <FunctionSleepVariant variant>
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class FunctionSleep : public IFunction
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{
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public:
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static constexpr auto name = variant == FunctionSleepVariant::PerBlock ? "sleep" : "sleepEachRow";
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static FunctionPtr create(const Context &)
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{
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return std::make_shared<FunctionSleep<variant>>();
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}
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/// Get the name of the function.
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String getName() const override
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{
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return name;
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}
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/// Do not sleep during query analysis.
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bool isSuitableForConstantFolding() const override
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{
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return false;
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}
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size_t getNumberOfArguments() const override
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{
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return 1;
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}
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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WhichDataType which(arguments[0]);
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if (!which.isFloat()
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&& !which.isNativeUInt())
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throw Exception("Illegal type " + arguments[0]->getName() + " of argument of function " + getName() + ", expected Float64",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeUInt8>();
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) override
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{
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const IColumn * col = block.getByPosition(arguments[0]).column.get();
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if (!isColumnConst(*col))
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throw Exception("The argument of function " + getName() + " must be constant.", ErrorCodes::ILLEGAL_COLUMN);
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Float64 seconds = applyVisitor(FieldVisitorConvertToNumber<Float64>(), assert_cast<const ColumnConst &>(*col).getField());
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if (seconds < 0)
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throw Exception("Cannot sleep negative amount of time (not implemented)", ErrorCodes::BAD_ARGUMENTS);
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size_t size = col->size();
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/// We do not sleep if the block is empty.
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if (size > 0)
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{
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/// When sleeping, the query cannot be cancelled. For abitily to cancel query, we limit sleep time.
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if (seconds > 3.0) /// The choice is arbitrary
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throw Exception("The maximum sleep time is 3 seconds. Requested: " + toString(seconds), ErrorCodes::TOO_SLOW);
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UInt64 microseconds = seconds * (variant == FunctionSleepVariant::PerBlock ? 1 : size) * 1e6;
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sleepForMicroseconds(microseconds);
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}
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/// convertToFullColumn needed, because otherwise (constant expression case) function will not get called on each block.
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block.getByPosition(result).column = block.getByPosition(result).type->createColumnConst(size, 0u)->convertToFullColumnIfConst();
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}
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};
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}
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