ClickHouse/dbms/include/DB/Interpreters/ClientInfo.h

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#pragma once
#include <Poco/Net/SocketAddress.h>
#include <DB/Core/Types.h>
namespace DB
{
class WriteBuffer;
class ReadBuffer;
/** Information about client for query.
* Some fields are passed explicitly from client and some are calculated automatically.
*
* Contains info about initial query source, for tracing distributed queries
* (where one query initiates many other queries).
*/
class ClientInfo
{
public:
enum class Interface : UInt8
{
TCP = 1,
HTTP = 2,
};
enum class HTTPMethod : UInt8
{
UNKNOWN = 0,
GET = 1,
POST = 2,
};
enum class QueryKind : UInt8
{
NO_QUERY = 0, /// Uninitialized object.
INITIAL_QUERY = 1,
SECONDARY_QUERY = 2, /// Query that was initiated by another query for distributed query execution.
};
QueryKind query_kind = QueryKind::NO_QUERY;
/// Current values are not serialized, because it is passed separately.
String current_user;
String current_query_id;
Poco::Net::SocketAddress current_address;
/// When query_kind == INITIAL_QUERY, these values are equal to current.
String initial_user;
String initial_query_id;
Poco::Net::SocketAddress initial_address;
/// All below are parameters related to initial query.
Interface interface = Interface::TCP;
/// For tcp
String os_user;
String client_hostname;
String client_name;
UInt64 client_version_major = 0;
UInt64 client_version_minor = 0;
unsigned client_revision = 0;
/// For http
HTTPMethod http_method = HTTPMethod::UNKNOWN;
String http_user_agent;
/// Common
String quota_key;
bool empty() const { return query_kind == QueryKind::NO_QUERY; }
/** Serialization and deserialization.
* Only values that are not calculated automatically or passed separately are serialized.
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* Revisions are passed to use format that server will understand or client was used.
*/
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void write(WriteBuffer & out, const UInt64 server_protocol_revision) const;
void read(ReadBuffer & in, const UInt64 client_protocol_revision);
void fillOSUserHostNameAndVersionInfo();
};
}