mirror of
https://github.com/ClickHouse/ClickHouse.git
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300 lines
9.5 KiB
C++
300 lines
9.5 KiB
C++
#pragma once
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#include <sstream>
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#include <IO/ReadHelpers.h>
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#include <IO/ReadWriteBufferFromHTTP.h>
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#include <Interpreters/Context.h>
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#include <Parsers/IdentifierQuotingStyle.h>
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#include <Poco/File.h>
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#include <Poco/Logger.h>
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#include <Poco/Net/HTTPRequest.h>
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#include <Poco/Path.h>
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#include <Poco/URI.h>
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#include <Poco/Util/AbstractConfiguration.h>
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#include <Common/ShellCommand.h>
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#include <Common/config.h>
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#include <common/logger_useful.h>
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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 EXTERNAL_SERVER_IS_NOT_RESPONDING;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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/**
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* Class for Helpers for Xdbc-bridges, provide utility methods, not main request
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*/
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class IXDBCBridgeHelper
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{
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public:
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static constexpr inline auto DEFAULT_FORMAT = "RowBinary";
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virtual std::vector<std::pair<std::string, std::string>> getURLParams(const std::string & cols, UInt64 max_block_size) const = 0;
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virtual void startBridgeSync() const = 0;
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virtual Poco::URI getMainURI() const = 0;
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virtual Poco::URI getColumnsInfoURI() const = 0;
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virtual IdentifierQuotingStyle getIdentifierQuotingStyle() = 0;
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virtual String getName() const = 0;
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virtual ~IXDBCBridgeHelper() = default;
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};
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using BridgeHelperPtr = std::shared_ptr<IXDBCBridgeHelper>;
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template <typename BridgeHelperMixin>
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class XDBCBridgeHelper : public IXDBCBridgeHelper
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{
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private:
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Poco::Timespan http_timeout;
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std::string connection_string;
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Poco::URI ping_url;
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Poco::Logger * log = &Poco::Logger::get(BridgeHelperMixin::getName() + "BridgeHelper");
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std::optional<IdentifierQuotingStyle> quote_style;
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protected:
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auto getConnectionString() const
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{
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return connection_string;
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}
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public:
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using Configuration = Poco::Util::AbstractConfiguration;
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const Context & context;
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const Configuration & config;
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static constexpr inline auto DEFAULT_HOST = "localhost";
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static constexpr inline auto DEFAULT_PORT = BridgeHelperMixin::DEFAULT_PORT;
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static constexpr inline auto PING_HANDLER = "/ping";
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static constexpr inline auto MAIN_HANDLER = "/";
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static constexpr inline auto COL_INFO_HANDLER = "/columns_info";
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static constexpr inline auto IDENTIFIER_QUOTE_HANDLER = "/identifier_quote";
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static constexpr inline auto PING_OK_ANSWER = "Ok.";
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XDBCBridgeHelper(const Context & global_context_, const Poco::Timespan & http_timeout_, const std::string & connection_string_)
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: http_timeout(http_timeout_), connection_string(connection_string_), context(global_context_), config(context.getConfigRef())
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{
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size_t bridge_port = config.getUInt(BridgeHelperMixin::configPrefix() + ".port", DEFAULT_PORT);
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std::string bridge_host = config.getString(BridgeHelperMixin::configPrefix() + ".host", DEFAULT_HOST);
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ping_url.setHost(bridge_host);
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ping_url.setPort(bridge_port);
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ping_url.setScheme("http");
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ping_url.setPath(PING_HANDLER);
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}
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String getName() const override
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{
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return BridgeHelperMixin::getName();
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}
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IdentifierQuotingStyle getIdentifierQuotingStyle() override
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{
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if (!quote_style.has_value())
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{
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startBridgeSync();
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auto uri = createBaseURI();
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uri.setPath(IDENTIFIER_QUOTE_HANDLER);
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uri.addQueryParameter("connection_string", getConnectionString());
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ReadWriteBufferFromHTTP buf(uri, Poco::Net::HTTPRequest::HTTP_POST, nullptr);
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std::string character;
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readStringBinary(character, buf);
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if (character.length() > 1)
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throw Exception("Failed to parse quoting style from '" + character + "' for service " + BridgeHelperMixin::serviceAlias(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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else if (character.length() == 0)
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quote_style = IdentifierQuotingStyle::None;
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else if (character[0] == '`')
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quote_style = IdentifierQuotingStyle::Backticks;
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else if (character[0] == '"')
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quote_style = IdentifierQuotingStyle::DoubleQuotes;
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else
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throw Exception("Can not map quote identifier '" + character + "' to enum value", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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return *quote_style;
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}
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/**
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* @todo leaky abstraction - used by external API's
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*/
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std::vector<std::pair<std::string, std::string>> getURLParams(const std::string & cols, UInt64 max_block_size) const override
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{
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std::vector<std::pair<std::string, std::string>> result;
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result.emplace_back("connection_string", connection_string); /// already validated
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result.emplace_back("columns", cols);
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result.emplace_back("max_block_size", std::to_string(max_block_size));
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return result;
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}
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/**
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* Performs spawn of external daemon
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*/
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void startBridgeSync() const override
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{
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if (!checkBridgeIsRunning())
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{
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LOG_TRACE(log, BridgeHelperMixin::serviceAlias() + " is not running, will try to start it");
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startBridge();
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bool started = false;
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for (size_t counter : ext::range(1, 20))
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{
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LOG_TRACE(log, "Checking " + BridgeHelperMixin::serviceAlias() + " is running, try " << counter);
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if (checkBridgeIsRunning())
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{
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started = true;
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break;
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}
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std::this_thread::sleep_for(std::chrono::milliseconds(10));
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}
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if (!started)
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throw Exception(BridgeHelperMixin::getName() + "BridgeHelper: " + BridgeHelperMixin::serviceAlias() + " is not responding",
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ErrorCodes::EXTERNAL_SERVER_IS_NOT_RESPONDING);
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}
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}
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/**
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* URI to fetch the data from external service
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*/
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Poco::URI getMainURI() const override
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{
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auto uri = createBaseURI();
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uri.setPath(MAIN_HANDLER);
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return uri;
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}
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/**
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* URI to retrieve column description from external service
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*/
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Poco::URI getColumnsInfoURI() const override
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{
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auto uri = createBaseURI();
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uri.setPath(COL_INFO_HANDLER);
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return uri;
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}
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protected:
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Poco::URI createBaseURI() const
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{
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Poco::URI uri;
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uri.setHost(ping_url.getHost());
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uri.setPort(ping_url.getPort());
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uri.setScheme("http");
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return uri;
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}
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private:
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bool checkBridgeIsRunning() const
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{
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try
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{
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ReadWriteBufferFromHTTP buf(ping_url, Poco::Net::HTTPRequest::HTTP_GET, nullptr);
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return checkString(XDBCBridgeHelper::PING_OK_ANSWER, buf);
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}
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catch (...)
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{
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return false;
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}
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}
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/* Contains logic for instantiation of the bridge instance */
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void startBridge() const
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{
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auto cmd = BridgeHelperMixin::startBridge(config, log, http_timeout);
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context.addXDBCBridgeCommand(std::move(cmd));
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}
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};
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struct JDBCBridgeMixin
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{
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static constexpr inline auto DEFAULT_PORT = 9019;
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static const String configPrefix()
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{
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return "jdbc_bridge";
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}
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static const String serviceAlias()
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{
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return "clickhouse-jdbc-bridge";
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}
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static const String getName()
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{
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return "JDBC";
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}
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static std::unique_ptr<ShellCommand> startBridge(const Poco::Util::AbstractConfiguration &, const Poco::Logger *, const Poco::Timespan &)
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{
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throw Exception("jdbc-bridge is not running. Please, start it manually", ErrorCodes::EXTERNAL_SERVER_IS_NOT_RESPONDING);
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}
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};
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struct ODBCBridgeMixin
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{
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static constexpr inline auto DEFAULT_PORT = 9018;
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static const String configPrefix()
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{
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return "odbc_bridge";
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}
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static const String serviceAlias()
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{
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return "clickhouse-odbc-bridge";
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}
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static const String getName()
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{
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return "ODBC";
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}
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static std::unique_ptr<ShellCommand> startBridge(const Poco::Util::AbstractConfiguration & config, Poco::Logger * log, const Poco::Timespan & http_timeout)
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{
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/// Path to executable folder
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Poco::Path path{config.getString("application.dir", "/usr/bin")};
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std::vector<std::string> cmd_args;
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path.setFileName("clickhouse-odbc-bridge");
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std::stringstream command;
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#if !CLICKHOUSE_SPLIT_BINARY
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cmd_args.push_back("odbc-bridge");
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#endif
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cmd_args.push_back("--http-port");
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cmd_args.push_back(std::to_string(config.getUInt(configPrefix() + ".port", DEFAULT_PORT)));
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cmd_args.push_back("--listen-host");
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cmd_args.push_back(config.getString(configPrefix() + ".listen_host", XDBCBridgeHelper<ODBCBridgeMixin>::DEFAULT_HOST));
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cmd_args.push_back("--http-timeout");
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cmd_args.push_back(std::to_string(http_timeout.totalMicroseconds()));
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if (config.has("logger." + configPrefix() + "_log"))
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{
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cmd_args.push_back("--log-path");
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cmd_args.push_back(config.getString("logger." + configPrefix() + "_log"));
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}
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if (config.has("logger." + configPrefix() + "_errlog"))
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{
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cmd_args.push_back("--err-log-path");
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cmd_args.push_back(config.getString("logger." + configPrefix() + "_errlog"));
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}
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if (config.has("logger." + configPrefix() + "_level"))
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{
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cmd_args.push_back("--log-level");
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cmd_args.push_back(config.getString("logger." + configPrefix() + "_level"));
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}
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LOG_TRACE(log, "Starting " + serviceAlias());
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return ShellCommand::executeDirect(path.toString(), cmd_args, true);
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}
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};
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}
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