ClickHouse/programs/client/TestHint.h

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#pragma once
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#include <optional>
#include <Core/Types.h>
namespace DB
{
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/// Checks expected server and client error codes in --testmode.
///
/// The following comment hints are supported:
///
/// - "-- { serverError 60 }" -- in case of you are expecting server error.
///
/// - "-- { clientError 20 }" -- in case of you are expecting client error.
///
/// - "-- { serverError FUNCTION_THROW_IF_VALUE_IS_NON_ZERO }" -- by error name.
///
/// - "-- { clientError FUNCTION_THROW_IF_VALUE_IS_NON_ZERO }" -- by error name.
///
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/// Remember that the client parse the query first (not the server), so for
/// example if you are expecting syntax error, then you should use
/// clientError not serverError.
///
/// Examples:
///
/// - echo 'select / -- { clientError 62 }' | clickhouse-client --testmode -nm
///
// Here the client parses the query but it is incorrect, so it expects
/// SYNTAX_ERROR (62).
///
/// - echo 'select foo -- { serverError 47 }' | clickhouse-client --testmode -nm
///
/// But here the query is correct, but there is no such column "foo", so it
/// is UNKNOWN_IDENTIFIER server error.
///
/// The following hints will control the query echo mode (i.e print each query):
///
/// - "-- { echo }"
/// - "-- { echoOn }"
/// - "-- { echoOff }"
class TestHint
{
public:
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TestHint(bool enabled_, const String & query_);
int serverError() const { return server_error; }
int clientError() const { return client_error; }
std::optional<bool> echoQueries() const { return echo; }
private:
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const String & query;
int server_error = 0;
int client_error = 0;
std::optional<bool> echo;
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void parse(const String & hint, bool is_leading_hint);
bool allErrorsExpected(int actual_server_error, int actual_client_error) const
{
return (server_error || client_error) && (server_error == actual_server_error) && (client_error == actual_client_error);
}
bool lostExpectedError(int actual_server_error, int actual_client_error) const
{
return (server_error && !actual_server_error) || (client_error && !actual_client_error);
}
};
}