mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-13 19:14:30 +00:00
128 lines
3.6 KiB
C++
128 lines
3.6 KiB
C++
#pragma once
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#include <DB/Dictionaries/IDictionarySource.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/InterpreterSelectQuery.h>
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#include <DB/Interpreters/executeQuery.h>
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#include <statdaemons/ext/range.hpp>
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#include <Poco/Util/AbstractConfiguration.h>
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#include <Poco/Net/NetworkInterface.h>
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namespace DB
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{
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const auto max_connections = 1;
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class ClickhouseDictionarySource final : public IDictionarySource
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{
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static const auto max_block_size = 8192;
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public:
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ClickhouseDictionarySource(Poco::Util::AbstractConfiguration & config, const std::string & config_prefix,
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Block & sample_block, Context & context)
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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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sample_block{sample_block}, context(context),
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is_local{isLocal(host, port)},
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pool{is_local ? nullptr : ext::make_unique<ConnectionPool>(
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max_connections, host, port, db, user, password, context.getDataTypeFactory(),
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"ClickhouseDictionarySource")
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},
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load_all_query{composeLoadAllQuery(sample_block, table)}
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{}
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ClickhouseDictionarySource(const ClickhouseDictionarySource & other)
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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.db},
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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 : ext::make_unique<ConnectionPool>(
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max_connections, host, port, db, user, password, context.getDataTypeFactory(),
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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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if (is_local)
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return executeQuery(load_all_query, context).in;
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return new RemoteBlockInputStream{pool.get(), load_all_query, nullptr};
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}
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BlockInputStreamPtr loadId(const std::uint64_t id) override
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{
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throw Exception{
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"Method unsupported",
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ErrorCodes::NOT_IMPLEMENTED
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};
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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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throw Exception{
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"Method unsupported",
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ErrorCodes::NOT_IMPLEMENTED
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};
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}
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/// @todo check update time somehow
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bool isModified() const override { return true; }
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DictionarySourcePtr clone() const override { return ext::make_unique<ClickhouseDictionarySource>(*this); }
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private:
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static std::string composeLoadAllQuery(const Block & block, const std::string & table)
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{
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std::string query{"SELECT "};
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auto first = true;
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for (const auto idx : ext::range(0, block.columns()))
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{
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if (!first)
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query += ", ";
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query += block.getByPosition(idx).name;
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first = false;
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}
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query += " FROM " + table + ';';
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return query;
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}
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static bool isLocal(const std::string & host, const UInt16 port)
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{
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const UInt16 clickhouse_port = Poco::Util::Application::instance().config().getInt("tcp_port", 0);
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static auto interfaces = Poco::Net::NetworkInterface::list();
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if (clickhouse_port == port)
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{
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return interfaces.end() != std::find_if(interfaces.begin(), interfaces.end(),
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[&] (const Poco::Net::NetworkInterface & interface) {
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return interface.address() == Poco::Net::IPAddress(host);
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});
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}
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return false;
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}
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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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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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};
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}
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