mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-09 10:00:54 +00:00
108 lines
3.8 KiB
C++
108 lines
3.8 KiB
C++
#include <Dictionaries/ClickHouseDictionarySource.h>
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#include <Dictionaries/ExternalQueryBuilder.h>
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#include <Dictionaries/writeParenthesisedString.h>
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#include <Client/ConnectionPool.h>
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#include <DataStreams/RemoteBlockInputStream.h>
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#include <Interpreters/executeQuery.h>
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#include <Common/isLocalAddress.h>
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#include <memory>
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#include <ext/range.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 UNSUPPORTED_METHOD;
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}
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static const size_t MAX_CONNECTIONS = 16;
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static ConnectionPoolWithFailoverPtr createPool(
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const std::string & host, UInt16 port, const std::string & db, const std::string & user, const std::string & password)
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{
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ConnectionPoolPtrs pools;
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pools.emplace_back(std::make_shared<ConnectionPool>(
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MAX_CONNECTIONS, host, port, db, user, password, "ClickHouseDictionarySource"));
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return std::make_shared<ConnectionPoolWithFailover>(pools, LoadBalancing::RANDOM);
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}
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ClickHouseDictionarySource::ClickHouseDictionarySource(
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const DictionaryStructure & dict_struct_,
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const Poco::Util::AbstractConfiguration & config,
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const std::string & config_prefix,
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const Block & sample_block, Context & context)
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: dict_struct{dict_struct_},
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host{config.getString(config_prefix + ".host")},
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port(config.getInt(config_prefix + ".port")),
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user{config.getString(config_prefix + ".user", "")},
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password{config.getString(config_prefix + ".password", "")},
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db{config.getString(config_prefix + ".db", "")},
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table{config.getString(config_prefix + ".table")},
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where{config.getString(config_prefix + ".where", "")},
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query_builder{dict_struct, db, table, where, ExternalQueryBuilder::Backticks},
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sample_block{sample_block}, context(context),
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is_local{isLocalAddress({ host, port })},
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pool{is_local ? nullptr : createPool(host, port, db, user, password)},
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load_all_query{query_builder.composeLoadAllQuery()}
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{}
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ClickHouseDictionarySource::ClickHouseDictionarySource(const ClickHouseDictionarySource & other)
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: dict_struct{other.dict_struct},
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host{other.host}, port{other.port}, user{other.user}, password{other.password},
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db{other.db}, table{other.table},
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where{other.where},
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query_builder{dict_struct, db, table, where, ExternalQueryBuilder::Backticks},
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sample_block{other.sample_block}, context(other.context),
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is_local{other.is_local},
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pool{is_local ? nullptr : createPool(host, port, db, user, password)},
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load_all_query{other.load_all_query}
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{}
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BlockInputStreamPtr ClickHouseDictionarySource::loadAll()
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{
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/** Query to local ClickHouse is marked internal in order to avoid
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* the necessity of holding process_list_element shared pointer.
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*/
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if (is_local)
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return executeQuery(load_all_query, context, true).in;
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return std::make_shared<RemoteBlockInputStream>(pool, load_all_query, nullptr);
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}
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BlockInputStreamPtr ClickHouseDictionarySource::loadIds(const std::vector<UInt64> & ids)
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{
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return createStreamForSelectiveLoad(
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query_builder.composeLoadIdsQuery(ids));
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}
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BlockInputStreamPtr ClickHouseDictionarySource::loadKeys(
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const Columns & key_columns, const std::vector<std::size_t> & requested_rows)
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{
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return createStreamForSelectiveLoad(
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query_builder.composeLoadKeysQuery(
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key_columns, requested_rows, ExternalQueryBuilder::IN_WITH_TUPLES));
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}
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std::string ClickHouseDictionarySource::toString() const
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{
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return "ClickHouse: " + db + '.' + table + (where.empty() ? "" : ", where: " + where);
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}
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BlockInputStreamPtr ClickHouseDictionarySource::createStreamForSelectiveLoad(const std::string query)
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{
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if (is_local)
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return executeQuery(query, context, true).in;
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return std::make_shared<RemoteBlockInputStream>(pool, query, nullptr);
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}
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}
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