ClickHouse/dbms/src/Interpreters/Context.h

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#pragma once
#include <chrono>
#include <condition_variable>
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#include <functional>
#include <memory>
#include <mutex>
#include <thread>
#include <Core/Types.h>
#include <Core/NamesAndTypes.h>
#include <Interpreters/Settings.h>
#include <Interpreters/ClientInfo.h>
#include <IO/CompressedStream.h>
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namespace Poco
{
namespace Net
{
class IPAddress;
}
}
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namespace zkutil
{
class ZooKeeper;
}
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namespace DB
{
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struct ContextShared;
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class QuotaForIntervals;
class EmbeddedDictionaries;
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class ExternalDictionaries;
class InterserverIOHandler;
class BackgroundProcessingPool;
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class ReshardingWorker;
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class MergeList;
class Cluster;
class Compiler;
class MarkCache;
class UncompressedCache;
class ProcessList;
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struct ProcessListElement;
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class Macros;
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struct Progress;
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class Clusters;
class QueryLog;
class PartLog;
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struct MergeTreeSettings;
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class IDatabase;
class DDLGuard;
class DDLWorker;
class IStorage;
using StoragePtr = std::shared_ptr<IStorage>;
using Tables = std::map<String, StoragePtr>;
class IAST;
using ASTPtr = std::shared_ptr<IAST>;
class IBlockInputStream;
class IBlockOutputStream;
using BlockInputStreamPtr = std::shared_ptr<IBlockInputStream>;
using BlockOutputStreamPtr = std::shared_ptr<IBlockOutputStream>;
class Block;
struct SystemLogs;
using SystemLogsPtr = std::shared_ptr<SystemLogs>;
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/// (database name, table name)
using DatabaseAndTableName = std::pair<String, String>;
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/// Table -> set of table-views that make SELECT from it.
using ViewDependencies = std::map<DatabaseAndTableName, std::set<DatabaseAndTableName>>;
using Dependencies = std::vector<DatabaseAndTableName>;
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/** A set of known objects that can be used in the query.
* Consists of a shared part (always common to all sessions and queries)
* and copied part (which can be its own for each session or query).
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*
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* Everything is encapsulated for all sorts of checks and locks.
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*/
class Context
{
private:
using Shared = std::shared_ptr<ContextShared>;
Shared shared;
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ClientInfo client_info;
std::shared_ptr<QuotaForIntervals> quota; /// Current quota. By default - empty quota, that have no limits.
String current_database;
Settings settings; /// Setting for query execution.
using ProgressCallback = std::function<void(const Progress & progress)>;
ProgressCallback progress_callback; /// Callback for tracking progress of query execution.
ProcessListElement * process_list_elem = nullptr; /// For tracking total resource usage for query.
String default_format; /// Format, used when server formats data by itself and if query does not have FORMAT specification.
/// Thus, used in HTTP interface. If not specified - then some globally default format is used.
Tables external_tables; /// Temporary tables.
Context * session_context = nullptr; /// Session context or nullptr. Could be equal to this.
Context * global_context = nullptr; /// Global context or nullptr. Could be equal to this.
SystemLogsPtr system_logs; /// Used to log queries and operations on parts
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UInt64 session_close_cycle = 0;
bool session_is_used = false;
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using DatabasePtr = std::shared_ptr<IDatabase>;
using Databases = std::map<String, std::shared_ptr<IDatabase>>;
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/// Use copy constructor or createGlobal() instead
Context();
public:
/// Create initial Context with ContextShared and etc.
static Context createGlobal();
~Context();
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String getPath() const;
String getTemporaryPath() const;
String getFlagsPath() const;
void setPath(const String & path);
void setTemporaryPath(const String & path);
void setFlagsPath(const String & path);
using ConfigurationPtr = Poco::AutoPtr<Poco::Util::AbstractConfiguration>;
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/// Global application configuration settings.
void setConfig(const ConfigurationPtr & config);
ConfigurationPtr getConfig() const;
Poco::Util::AbstractConfiguration & getConfigRef() const;
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/** Take the list of users, quotas and configuration profiles from this config.
* The list of users is completely replaced.
* The accumulated quota values are not reset if the quota is not deleted.
*/
void setUsersConfig(const ConfigurationPtr & config);
ConfigurationPtr getUsersConfig();
/// Must be called before getClientInfo.
void setUser(const String & name, const String & password, const Poco::Net::SocketAddress & address, const String & quota_key);
/// Compute and set actual user settings, client_info.current_user should be set
void calculateUserSettings();
ClientInfo & getClientInfo() { return client_info; };
const ClientInfo & getClientInfo() const { return client_info; };
void setQuota(const String & name, const String & quota_key, const String & user_name, const Poco::Net::IPAddress & address);
QuotaForIntervals & getQuota();
void addDependency(const DatabaseAndTableName & from, const DatabaseAndTableName & where);
void removeDependency(const DatabaseAndTableName & from, const DatabaseAndTableName & where);
Dependencies getDependencies(const String & database_name, const String & table_name) const;
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/// Checking the existence of the table/database. Database can be empty - in this case the current database is used.
bool isTableExist(const String & database_name, const String & table_name) const;
bool isDatabaseExist(const String & database_name) const;
void assertTableExists(const String & database_name, const String & table_name) const;
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/** The parameter check_database_access_rights exists to not check the permissions of the database again,
* when assertTableDoesntExist or assertDatabaseExists is called inside another function that already
* made this check.
*/
void assertTableDoesntExist(const String & database_name, const String & table_name, bool check_database_acccess_rights = true) const;
void assertDatabaseExists(const String & database_name, bool check_database_acccess_rights = true) const;
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void assertDatabaseDoesntExist(const String & database_name) const;
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Tables getExternalTables() const;
StoragePtr tryGetExternalTable(const String & table_name) const;
StoragePtr getTable(const String & database_name, const String & table_name) const;
StoragePtr tryGetTable(const String & database_name, const String & table_name) const;
void addExternalTable(const String & table_name, StoragePtr storage);
StoragePtr tryRemoveExternalTable(const String & table_name);
void addDatabase(const String & database_name, const DatabasePtr & database);
DatabasePtr detachDatabase(const String & database_name);
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/// Get an object that protects the table from concurrently executing multiple DDL operations.
/// If such an object already exists, an exception is thrown.
std::unique_ptr<DDLGuard> getDDLGuard(const String & database, const String & table, const String & message) const;
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/// If the table already exists, it returns nullptr, otherwise guard is created.
std::unique_ptr<DDLGuard> getDDLGuardIfTableDoesntExist(const String & database, const String & table, const String & message) const;
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String getCurrentDatabase() const;
String getCurrentQueryId() const;
void setCurrentDatabase(const String & name);
void setCurrentQueryId(const String & query_id);
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String getDefaultFormat() const; /// If default_format is not specified, some global default format is returned.
void setDefaultFormat(const String & name);
const Macros & getMacros() const;
void setMacros(Macros && macros);
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Settings getSettings() const;
void setSettings(const Settings & settings_);
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Limits getLimits() const;
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/// Set a setting by name.
void setSetting(const String & name, const Field & value);
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/// Set a setting by name. Read the value in text form from a string (for example, from a config, or from a URL parameter).
void setSetting(const String & name, const std::string & value);
const EmbeddedDictionaries & getEmbeddedDictionaries() const;
const ExternalDictionaries & getExternalDictionaries() const;
EmbeddedDictionaries & getEmbeddedDictionaries();
ExternalDictionaries & getExternalDictionaries();
void tryCreateEmbeddedDictionaries() const;
void tryCreateExternalDictionaries() const;
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/// I/O formats.
BlockInputStreamPtr getInputFormat(const String & name, ReadBuffer & buf, const Block & sample, size_t max_block_size) const;
BlockOutputStreamPtr getOutputFormat(const String & name, WriteBuffer & buf, const Block & sample) const;
InterserverIOHandler & getInterserverIOHandler();
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/// How other servers can access this for downloading replicated data.
void setInterserverIOAddress(const String & host, UInt16 port);
std::pair<String, UInt16> getInterserverIOAddress() const;
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/// The port that the server listens for executing SQL queries.
UInt16 getTCPPort() const;
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/// Get query for the CREATE table.
ASTPtr getCreateQuery(const String & database_name, const String & table_name) const;
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const DatabasePtr getDatabase(const String & database_name) const;
DatabasePtr getDatabase(const String & database_name);
const DatabasePtr tryGetDatabase(const String & database_name) const;
DatabasePtr tryGetDatabase(const String & database_name);
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const Databases getDatabases() const;
Databases getDatabases();
Squashed commit of the following: commit f9b478181cd49224154cc350fb57df7121842f1c Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 04:06:36 2016 +0300 Database engines: development [#METR-19997]. commit f7a10a67761ccfd05f3dac32d6444920cd8d4d60 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 03:44:37 2016 +0300 Database engines: development [#METR-19997]. commit bd98a8558e98bad2bed278e5762c4e0fc66e6f38 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:33:59 2016 +0300 Database engines: development [#METR-19997]. commit 19712fd884c22a4e2c2b67474086dea8f44e7c7b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:03:11 2016 +0300 Database engines: development [#METR-19997]. commit 50274d6df7e91fcc34aab8a8c72347daa2c6512f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 23:24:57 2016 +0300 Database engines: development [#METR-19997]. commit 4a0b99b19b34e90ef8b7be2d199f6232e36ef3f7 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 22:50:36 2016 +0300 Database engines: development [#METR-19997]. commit 44ff3ebba7a3e460a27a89f31ddf199dbea1d182 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 15:09:17 2016 +0300 Database engines: development [#METR-19997]. commit 137c31f3004cfd282473b6acb01cbe1b4ca2aadd Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:26:34 2016 +0300 Database engines: development [#METR-19997]. commit aa4c0496d4afe4a691164254be2bd5600542b38a Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:22:59 2016 +0300 Database engines: development [#METR-19997]. commit 5a94d1f0607450a2dac28a4d7df8b1393a864c23 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 01:02:40 2016 +0300 Database engines: development [#METR-19997]. commit 50fd5b52ea1141955a5dfba0dcb191f3289ac25b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 23:23:40 2016 +0300 Database engines: development [#METR-19997]. commit a333d91b058e4f56dd83a6d2878c3c2bd8efc002 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 20:29:07 2016 +0300 Database engines: development [#METR-19997]. commit f81d366e7ac8348436f2698d040f8e341743a024 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 01:30:23 2016 +0300 Database engines: development [#METR-19997]. commit d0696860c9060827896214c08d147c759ea79376 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 21:55:31 2016 +0300 Database engines: development [#METR-19997]. commit 46a168c2ada140a0e95cd8d4b9d8ba9bac855d11 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 08:00:58 2016 +0300 Database engines: development [#METR-19997]. commit 20a2bad161454225fc1b5f9b919b842fbebc3231 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:51:10 2016 +0300 Database engines: development [#METR-19997]. commit ca0a77fcc2a8d0b276eb3743c53551ad3fe16314 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:02:20 2016 +0300 Reverted erroneous modification [#METR-19997]. commit 1370bdcc4594182f6ef2b146f9afabfe1c295080 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 00:41:34 2016 +0300 Database engines: development [#METR-19997]. commit 16e72c67041cae6471509d3f0f3d4a9aa7b7dc0f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Tue Mar 15 00:41:48 2016 +0300 Database engines: development [#METR-19997].
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std::shared_ptr<Context> acquireSession(const String & session_id, std::chrono::steady_clock::duration timeout, bool session_check) const;
void releaseSession(const String & session_id, std::chrono::steady_clock::duration timeout);
/// Close sessions, that has been expired. Returns how long to wait for next session to be expired, if no new sessions will be added.
std::chrono::steady_clock::duration closeSessions() const;
Squashed commit of the following: commit f9b478181cd49224154cc350fb57df7121842f1c Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 04:06:36 2016 +0300 Database engines: development [#METR-19997]. commit f7a10a67761ccfd05f3dac32d6444920cd8d4d60 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 03:44:37 2016 +0300 Database engines: development [#METR-19997]. commit bd98a8558e98bad2bed278e5762c4e0fc66e6f38 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:33:59 2016 +0300 Database engines: development [#METR-19997]. commit 19712fd884c22a4e2c2b67474086dea8f44e7c7b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:03:11 2016 +0300 Database engines: development [#METR-19997]. commit 50274d6df7e91fcc34aab8a8c72347daa2c6512f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 23:24:57 2016 +0300 Database engines: development [#METR-19997]. commit 4a0b99b19b34e90ef8b7be2d199f6232e36ef3f7 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 22:50:36 2016 +0300 Database engines: development [#METR-19997]. commit 44ff3ebba7a3e460a27a89f31ddf199dbea1d182 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 15:09:17 2016 +0300 Database engines: development [#METR-19997]. commit 137c31f3004cfd282473b6acb01cbe1b4ca2aadd Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:26:34 2016 +0300 Database engines: development [#METR-19997]. commit aa4c0496d4afe4a691164254be2bd5600542b38a Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:22:59 2016 +0300 Database engines: development [#METR-19997]. commit 5a94d1f0607450a2dac28a4d7df8b1393a864c23 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 01:02:40 2016 +0300 Database engines: development [#METR-19997]. commit 50fd5b52ea1141955a5dfba0dcb191f3289ac25b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 23:23:40 2016 +0300 Database engines: development [#METR-19997]. commit a333d91b058e4f56dd83a6d2878c3c2bd8efc002 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 20:29:07 2016 +0300 Database engines: development [#METR-19997]. commit f81d366e7ac8348436f2698d040f8e341743a024 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 01:30:23 2016 +0300 Database engines: development [#METR-19997]. commit d0696860c9060827896214c08d147c759ea79376 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 21:55:31 2016 +0300 Database engines: development [#METR-19997]. commit 46a168c2ada140a0e95cd8d4b9d8ba9bac855d11 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 08:00:58 2016 +0300 Database engines: development [#METR-19997]. commit 20a2bad161454225fc1b5f9b919b842fbebc3231 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:51:10 2016 +0300 Database engines: development [#METR-19997]. commit ca0a77fcc2a8d0b276eb3743c53551ad3fe16314 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:02:20 2016 +0300 Reverted erroneous modification [#METR-19997]. commit 1370bdcc4594182f6ef2b146f9afabfe1c295080 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 00:41:34 2016 +0300 Database engines: development [#METR-19997]. commit 16e72c67041cae6471509d3f0f3d4a9aa7b7dc0f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Tue Mar 15 00:41:48 2016 +0300 Database engines: development [#METR-19997].
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/// For methods below you may need to acquire a lock by yourself.
std::unique_lock<Poco::Mutex> getLock() const;
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const Context & getSessionContext() const;
Context & getSessionContext();
bool hasSessionContext() const { return session_context != nullptr; }
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const Context & getGlobalContext() const;
Context & getGlobalContext();
bool hasGlobalContext() const { return global_context != nullptr; }
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void setSessionContext(Context & context_) { session_context = &context_; }
void setGlobalContext(Context & context_) { global_context = &context_; }
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const Settings & getSettingsRef() const { return settings; };
Settings & getSettingsRef() { return settings; };
Squashed commit of the following: commit f9b478181cd49224154cc350fb57df7121842f1c Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 04:06:36 2016 +0300 Database engines: development [#METR-19997]. commit f7a10a67761ccfd05f3dac32d6444920cd8d4d60 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 03:44:37 2016 +0300 Database engines: development [#METR-19997]. commit bd98a8558e98bad2bed278e5762c4e0fc66e6f38 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:33:59 2016 +0300 Database engines: development [#METR-19997]. commit 19712fd884c22a4e2c2b67474086dea8f44e7c7b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:03:11 2016 +0300 Database engines: development [#METR-19997]. commit 50274d6df7e91fcc34aab8a8c72347daa2c6512f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 23:24:57 2016 +0300 Database engines: development [#METR-19997]. commit 4a0b99b19b34e90ef8b7be2d199f6232e36ef3f7 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 22:50:36 2016 +0300 Database engines: development [#METR-19997]. commit 44ff3ebba7a3e460a27a89f31ddf199dbea1d182 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 15:09:17 2016 +0300 Database engines: development [#METR-19997]. commit 137c31f3004cfd282473b6acb01cbe1b4ca2aadd Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:26:34 2016 +0300 Database engines: development [#METR-19997]. commit aa4c0496d4afe4a691164254be2bd5600542b38a Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:22:59 2016 +0300 Database engines: development [#METR-19997]. commit 5a94d1f0607450a2dac28a4d7df8b1393a864c23 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 01:02:40 2016 +0300 Database engines: development [#METR-19997]. commit 50fd5b52ea1141955a5dfba0dcb191f3289ac25b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 23:23:40 2016 +0300 Database engines: development [#METR-19997]. commit a333d91b058e4f56dd83a6d2878c3c2bd8efc002 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 20:29:07 2016 +0300 Database engines: development [#METR-19997]. commit f81d366e7ac8348436f2698d040f8e341743a024 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 01:30:23 2016 +0300 Database engines: development [#METR-19997]. commit d0696860c9060827896214c08d147c759ea79376 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 21:55:31 2016 +0300 Database engines: development [#METR-19997]. commit 46a168c2ada140a0e95cd8d4b9d8ba9bac855d11 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 08:00:58 2016 +0300 Database engines: development [#METR-19997]. commit 20a2bad161454225fc1b5f9b919b842fbebc3231 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:51:10 2016 +0300 Database engines: development [#METR-19997]. commit ca0a77fcc2a8d0b276eb3743c53551ad3fe16314 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:02:20 2016 +0300 Reverted erroneous modification [#METR-19997]. commit 1370bdcc4594182f6ef2b146f9afabfe1c295080 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 00:41:34 2016 +0300 Database engines: development [#METR-19997]. commit 16e72c67041cae6471509d3f0f3d4a9aa7b7dc0f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Tue Mar 15 00:41:48 2016 +0300 Database engines: development [#METR-19997].
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void setProgressCallback(ProgressCallback callback);
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/// Used in InterpreterSelectQuery to pass it to the IProfilingBlockInputStream.
ProgressCallback getProgressCallback() const;
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/** Set in executeQuery and InterpreterSelectQuery. Then it is used in IProfilingBlockInputStream,
* to update and monitor information about the total number of resources spent for the query.
*/
void setProcessListElement(ProcessListElement * elem);
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/// Can return nullptr if the query was not inserted into the ProcessList.
ProcessListElement * getProcessListElement() const;
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/// List all queries.
ProcessList & getProcessList();
const ProcessList & getProcessList() const;
MergeList & getMergeList();
const MergeList & getMergeList() const;
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void setZooKeeper(std::shared_ptr<zkutil::ZooKeeper> zookeeper);
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/// If the current session is expired at the time of the call, synchronously creates and returns a new session with the startNewSession() call.
std::shared_ptr<zkutil::ZooKeeper> getZooKeeper() const;
/// Has ready or expired ZooKeeper
bool hasZooKeeper() const;
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/// Create a cache of uncompressed blocks of specified size. This can be done only once.
void setUncompressedCache(size_t max_size_in_bytes);
std::shared_ptr<UncompressedCache> getUncompressedCache() const;
void dropUncompressedCache() const;
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/// Create a cache of marks of specified size. This can be done only once.
void setMarkCache(size_t cache_size_in_bytes);
std::shared_ptr<MarkCache> getMarkCache() const;
void dropMarkCache() const;
/** Clear the caches of the uncompressed blocks and marks.
* This is usually done when renaming tables, changing the type of columns, deleting a table.
* - since caches are linked to file names, and become incorrect.
* (when deleting a table - it is necessary, since in its place another can appear)
* const - because the change in the cache is not considered significant.
*/
void dropCaches() const;
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BackgroundProcessingPool & getBackgroundPool();
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void setReshardingWorker(std::shared_ptr<ReshardingWorker> resharding_worker);
ReshardingWorker & getReshardingWorker() const;
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void setDDLWorker(std::shared_ptr<DDLWorker> ddl_worker);
DDLWorker & getDDLWorker() const;
Clusters & getClusters() const;
std::shared_ptr<Cluster> getCluster(const std::string & cluster_name) const;
std::shared_ptr<Cluster> tryGetCluster(const std::string & cluster_name) const;
void setClustersConfig(const ConfigurationPtr & config);
Compiler & getCompiler();
QueryLog & getQueryLog();
/// Returns an object used to log opertaions with parts if it possible.
/// Provide table name to make required cheks.
PartLog * getPartLog(const String & database, const String & table);
const MergeTreeSettings & getMergeTreeSettings();
/// Prevents DROP TABLE if its size is greater than max_size (50GB by default, max_size=0 turn off this check)
void setMaxTableSizeToDrop(size_t max_size);
void checkTableCanBeDropped(const String & database, const String & table, size_t table_size);
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/// Lets you select the compression method according to the conditions described in the configuration file.
CompressionMethod chooseCompressionMethod(size_t part_size, double part_size_ratio) const;
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/// Get the server uptime in seconds.
time_t getUptimeSeconds() const;
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void shutdown();
enum class ApplicationType
{
SERVER, /// The program is run as clickhouse-server daemon (default behavior)
CLIENT, /// clickhouse-client
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LOCAL /// clickhouse-local
};
ApplicationType getApplicationType() const;
void setApplicationType(ApplicationType type);
/// Set once
String getDefaultProfileName() const;
void setDefaultProfileName(const String & name);
/// User name and session identifier. Named sessions are local to users.
using SessionKey = std::pair<String, String>;
private:
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/** Check if the current client has access to the specified database.
* If access is denied, throw an exception.
* NOTE: This method should always be called when the `shared->mutex` mutex is acquired.
*/
void checkDatabaseAccessRights(const std::string & database_name) const;
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EmbeddedDictionaries & getEmbeddedDictionariesImpl(bool throw_on_error) const;
ExternalDictionaries & getExternalDictionariesImpl(bool throw_on_error) const;
StoragePtr getTableImpl(const String & database_name, const String & table_name, Exception * exception) const;
SessionKey getSessionKey(const String & session_id) const;
/// Session will be closed after specified timeout.
void scheduleCloseSession(const SessionKey & key, std::chrono::steady_clock::duration timeout);
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};
/// Puts an element into the map, erases it in the destructor.
/// If the element already exists in the map, throws an exception containing provided message.
class DDLGuard
{
public:
/// Element name -> message.
/// NOTE: using std::map here (and not std::unordered_map) to avoid iterator invalidation on insertion.
using Map = std::map<String, String>;
DDLGuard(Map & map_, std::mutex & mutex_, std::unique_lock<std::mutex> && lock, const String & elem, const String & message);
~DDLGuard();
private:
Map & map;
Map::iterator it;
std::mutex & mutex;
};
class SessionCleaner
{
public:
SessionCleaner(Context & context_)
: context{context_}
{
}
~SessionCleaner();
private:
void run();
Context & context;
std::mutex mutex;
std::condition_variable cond;
std::atomic<bool> quit{false};
std::thread thread{&SessionCleaner::run, this};
};
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}