mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-22 01:30:51 +00:00
384 lines
9.4 KiB
C++
384 lines
9.4 KiB
C++
#pragma once
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#include <DB/Dictionaries/IDictionarySource.h>
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#include <DB/Dictionaries/DictionaryStructure.h>
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#include <DB/Client/ConnectionPool.h>
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#include <DB/DataStreams/RemoteBlockInputStream.h>
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#include <DB/Interpreters/executeQuery.h>
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#include <DB/Common/isLocalAddress.h>
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#include <ext/range.hpp>
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#include <Poco/Util/AbstractConfiguration.h>
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#include "writeParenthesisedString.h"
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namespace DB
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{
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const auto max_connections = 16;
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/** Allows loading dictionaries from local or remote ClickHouse instance
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* @todo use ConnectionPoolWithFailover
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* @todo invent a way to keep track of source modifications
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*/
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class ClickHouseDictionarySource final : public IDictionarySource
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{
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public:
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ClickHouseDictionarySource(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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sample_block{sample_block}, context(context),
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is_local{isLocalAddress({ host, port })},
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pool{is_local ? nullptr : std::make_unique<ConnectionPool>(
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max_connections, host, port, db, user, password,
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"ClickHouseDictionarySource")
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},
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load_all_query{composeLoadAllQuery()},
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key_tuple_definition{dict_struct.key ? composeKeyTupleDefinition() : std::string{}}
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{}
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/// copy-constructor is provided in order to support cloneability
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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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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 : std::make_unique<ConnectionPool>(
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max_connections, host, port, db, user, password,
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"ClickHouseDictionarySource")},
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load_all_query{other.load_all_query}
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{}
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BlockInputStreamPtr loadAll() override
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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 new RemoteBlockInputStream{pool.get(), load_all_query, nullptr};
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}
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BlockInputStreamPtr loadIds(const std::vector<std::uint64_t> & ids) override
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{
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return createStreamForSelectiveLoad(composeLoadIdsQuery(ids));
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}
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BlockInputStreamPtr loadKeys(
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const ConstColumnPlainPtrs & key_columns, const std::vector<std::size_t> & requested_rows) override
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{
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return createStreamForSelectiveLoad(composeLoadKeysQuery(key_columns, requested_rows));
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}
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bool isModified() const override { return true; }
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bool supportsSelectiveLoad() const override { return true; }
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DictionarySourcePtr clone() const override { return std::make_unique<ClickHouseDictionarySource>(*this); }
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std::string toString() const override
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{
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return "ClickHouse: " + db + '.' + table + (where.empty() ? "" : ", where: " + where);
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}
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private:
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std::string composeLoadAllQuery() const
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{
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std::string query;
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{
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WriteBufferFromString out{query};
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writeString("SELECT ", out);
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if (dict_struct.id)
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{
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if (!dict_struct.id->expression.empty())
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{
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writeParenthesisedString(dict_struct.id->expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(dict_struct.id->name, out);
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if (dict_struct.range_min && dict_struct.range_max)
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{
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writeString(", ", out);
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if (!dict_struct.range_min->expression.empty())
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{
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writeParenthesisedString(dict_struct.range_min->expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(dict_struct.range_min->name, out);
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writeString(", ", out);
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if (!dict_struct.range_max->expression.empty())
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{
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writeParenthesisedString(dict_struct.range_max->expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(dict_struct.range_max->name, out);
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}
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}
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else if (dict_struct.key)
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{
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auto first = true;
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for (const auto & key : *dict_struct.key)
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{
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if (!first)
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writeString(", ", out);
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first = false;
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if (!key.expression.empty())
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{
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writeParenthesisedString(key.expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(key.name, out);
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}
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}
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for (const auto & attr : dict_struct.attributes)
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{
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writeString(", ", out);
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if (!attr.expression.empty())
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{
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writeParenthesisedString(attr.expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(attr.name, out);
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}
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writeString(" FROM ", out);
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if (!db.empty())
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{
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writeProbablyBackQuotedString(db, out);
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writeChar('.', out);
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}
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writeProbablyBackQuotedString(table, out);
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if (!where.empty())
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{
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writeString(" WHERE ", out);
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writeString(where, out);
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}
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writeChar(';', out);
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}
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return query;
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}
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std::string composeLoadIdsQuery(const std::vector<std::uint64_t> ids)
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{
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if (!dict_struct.id)
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throw Exception{"Simple key required for method", ErrorCodes::UNSUPPORTED_METHOD};
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std::string query;
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{
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WriteBufferFromString out{query};
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writeString("SELECT ", out);
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if (!dict_struct.id->expression.empty())
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{
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writeParenthesisedString(dict_struct.id->expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(dict_struct.id->name, out);
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for (const auto & attr : dict_struct.attributes)
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{
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writeString(", ", out);
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if (!attr.expression.empty())
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{
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writeParenthesisedString(attr.expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(attr.name, out);
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}
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writeString(" FROM ", out);
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if (!db.empty())
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{
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writeProbablyBackQuotedString(db, out);
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writeChar('.', out);
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}
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writeProbablyBackQuotedString(table, out);
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writeString(" WHERE ", out);
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if (!where.empty())
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{
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writeString(where, out);
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writeString(" AND ", out);
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}
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writeProbablyBackQuotedString(dict_struct.id->name, out);
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writeString(" IN (", out);
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auto first = true;
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for (const auto id : ids)
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{
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if (!first)
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writeString(", ", out);
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first = false;
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writeString(DB::toString(id), out);
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}
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writeString(");", out);
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}
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return query;
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}
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std::string composeLoadKeysQuery(
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const ConstColumnPlainPtrs & key_columns, const std::vector<std::size_t> & requested_rows)
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{
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if (!dict_struct.key)
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throw Exception{"Composite key required for method", ErrorCodes::UNSUPPORTED_METHOD};
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std::string query;
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{
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WriteBufferFromString out{query};
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writeString("SELECT ", out);
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auto first = true;
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for (const auto & key_or_attribute : boost::join(*dict_struct.key, dict_struct.attributes))
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{
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if (!first)
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writeString(", ", out);
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first = false;
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if (!key_or_attribute.expression.empty())
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{
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writeParenthesisedString(key_or_attribute.expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(key_or_attribute.name, out);
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}
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writeString(" FROM ", out);
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if (!db.empty())
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{
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writeProbablyBackQuotedString(db, out);
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writeChar('.', out);
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}
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writeProbablyBackQuotedString(table, out);
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writeString(" WHERE ", out);
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if (!where.empty())
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{
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writeString(where, out);
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writeString(" AND ", out);
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}
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writeString(key_tuple_definition, out);
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writeString(" IN (", out);
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first = true;
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for (const auto row : requested_rows)
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{
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if (!first)
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writeString(", ", out);
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first = false;
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composeKeyTuple(key_columns, row, out);
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}
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writeString(");", out);
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}
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return query;
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}
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std::string composeKeyTupleDefinition() const
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{
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if (!dict_struct.key)
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throw Exception{"Composite key required for method", ErrorCodes::UNSUPPORTED_METHOD};
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std::string result{"("};
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auto first = true;
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for (const auto & key : *dict_struct.key)
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{
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if (!first)
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result += ", ";
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first = false;
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result += key.name;
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}
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result += ")";
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return result;
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}
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void composeKeyTuple(const ConstColumnPlainPtrs & key_columns, const std::size_t row, WriteBuffer & out) const
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{
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writeString("(", out);
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const auto keys_size = key_columns.size();
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auto first = true;
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for (const auto i : ext::range(0, keys_size))
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{
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if (!first)
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writeString(", ", out);
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first = false;
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const auto & value = (*key_columns[i])[row];
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(*dict_struct.key)[i].type->serializeTextQuoted(value, out);
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}
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writeString(")", out);
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}
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BlockInputStreamPtr 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 new RemoteBlockInputStream{pool.get(), query, nullptr};
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}
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const DictionaryStructure dict_struct;
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const std::string host;
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const UInt16 port;
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const std::string user;
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const std::string password;
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const std::string db;
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const std::string table;
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const std::string where;
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Block sample_block;
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Context & context;
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const bool is_local;
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std::unique_ptr<ConnectionPool> pool;
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const std::string load_all_query;
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const std::string key_tuple_definition;
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};
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}
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