Backport #12165 to 20.5: Fix splitting table name of dictionary source

programs/odbc-bridge/CMakeLists.txt

@@ -8,6 +8,7 @@ set (CLICKHOUSE_ODBC_BRIDGE_SOURCES
     ODBCBlockOutputStream.cpp
     ODBCBridge.cpp
     PingHandler.cpp
+    SchemaAllowedHandler.cpp
     validateODBCConnectionString.cpp
 )
 

programs/odbc-bridge/HandlerFactory.cpp

@@ -29,6 +29,12 @@ Poco::Net::HTTPRequestHandler * HandlerFactory::createRequestHandler(const Poco:
             return new IdentifierQuoteHandler(keep_alive_timeout, context);
 #else
             return nullptr;
+#endif
+        else if (uri.getPath() == "/schema_allowed")
+#if USE_ODBC
+            return new SchemaAllowedHandler(keep_alive_timeout, context);
+#else
+            return nullptr;
 #endif
         else if (uri.getPath() == "/write")
             return new ODBCHandler(pool_map, keep_alive_timeout, context, "write");

programs/odbc-bridge/HandlerFactory.h

@@ -6,6 +6,7 @@
 #include "MainHandler.h"
 #include "ColumnInfoHandler.h"
 #include "IdentifierQuoteHandler.h"
+#include "SchemaAllowedHandler.h"
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-parameter"
@@ -15,7 +16,7 @@
 
 namespace DB
 {
-/** Factory for '/ping', '/', '/columns_info', '/identifier_quote' handlers.
+/** Factory for '/ping', '/', '/columns_info', '/identifier_quote', '/schema_allowed' handlers.
   * Also stores Session pools for ODBC connections
   */
 class HandlerFactory : public Poco::Net::HTTPRequestHandlerFactory

programs/odbc-bridge/SchemaAllowedHandler.cpp

@@ -0,0 +1,76 @@
+#include "SchemaAllowedHandler.h"
+
+#if USE_ODBC
+
+#    include <IO/WriteBufferFromHTTPServerResponse.h>
+#    include <IO/WriteHelpers.h>
+#    include <Poco/Data/ODBC/ODBCException.h>
+#    include <Poco/Data/ODBC/SessionImpl.h>
+#    include <Poco/Data/ODBC/Utility.h>
+#    include <Poco/Net/HTMLForm.h>
+#    include <Poco/Net/HTTPServerRequest.h>
+#    include <Poco/Net/HTTPServerResponse.h>
+#    include <common/logger_useful.h>
+#    include "validateODBCConnectionString.h"
+
+#    define POCO_SQL_ODBC_CLASS Poco::Data::ODBC
+
+namespace DB
+{
+namespace
+{
+    bool isSchemaAllowed(SQLHDBC hdbc)
+    {
+        std::string identifier;
+
+        SQLSMALLINT t;
+        SQLRETURN r = POCO_SQL_ODBC_CLASS::SQLGetInfo(hdbc, SQL_SCHEMA_USAGE, nullptr, 0, &t);
+
+        if (POCO_SQL_ODBC_CLASS::Utility::isError(r))
+            throw POCO_SQL_ODBC_CLASS::ConnectionException(hdbc);
+
+        return t != 0;
+    }
+}
+
+
+void SchemaAllowedHandler::handleRequest(Poco::Net::HTTPServerRequest & request, Poco::Net::HTTPServerResponse & response)
+{
+    Poco::Net::HTMLForm params(request, request.stream());
+    LOG_TRACE(log, "Request URI: {}", request.getURI());
+
+    auto process_error = [&response, this](const std::string & message)
+    {
+        response.setStatusAndReason(Poco::Net::HTTPResponse::HTTP_INTERNAL_SERVER_ERROR);
+        if (!response.sent())
+            response.send() << message << std::endl;
+        LOG_WARNING(log, message);
+    };
+
+    if (!params.has("connection_string"))
+    {
+        process_error("No 'connection_string' in request URL");
+        return;
+    }
+
+    try
+    {
+        std::string connection_string = params.get("connection_string");
+        POCO_SQL_ODBC_CLASS::SessionImpl session(validateODBCConnectionString(connection_string), DBMS_DEFAULT_CONNECT_TIMEOUT_SEC);
+        SQLHDBC hdbc = session.dbc().handle();
+
+        bool result = isSchemaAllowed(hdbc);
+
+        WriteBufferFromHTTPServerResponse out(request, response, keep_alive_timeout);
+        writeBoolText(result, out);
+    }
+    catch (...)
+    {
+        process_error("Error getting schema usage from ODBC '" + getCurrentExceptionMessage(false) + "'");
+        tryLogCurrentException(log);
+    }
+}
+
+}
+
+#endif

programs/odbc-bridge/SchemaAllowedHandler.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <Poco/Logger.h>
+#include <Poco/Net/HTTPRequestHandler.h>
+
+#if USE_ODBC
+
+namespace DB
+{
+class Context;
+
+
+/// This handler establishes connection to database, and retrieve whether schema is allowed.
+class SchemaAllowedHandler : public Poco::Net::HTTPRequestHandler
+{
+public:
+    SchemaAllowedHandler(size_t keep_alive_timeout_, Context &)
+        : log(&Poco::Logger::get("SchemaAllowedHandler")), keep_alive_timeout(keep_alive_timeout_)
+    {
+    }
+
+    void handleRequest(Poco::Net::HTTPServerRequest & request, Poco::Net::HTTPServerResponse & response) override;
+
+private:
+    Poco::Logger * log;
+    size_t keep_alive_timeout;
+};
+
+}
+
+#endif

src/Common/XDBCBridgeHelper.h

@@ -41,6 +41,7 @@ class IXDBCBridgeHelper
     virtual Poco::URI getMainURI() const = 0;
     virtual Poco::URI getColumnsInfoURI() const = 0;
     virtual IdentifierQuotingStyle getIdentifierQuotingStyle() = 0;
+    virtual bool isSchemaAllowed() = 0;
     virtual String getName() const = 0;
 
     virtual ~IXDBCBridgeHelper() = default;
@@ -61,6 +62,7 @@ class XDBCBridgeHelper : public IXDBCBridgeHelper
     Poco::Logger * log = &Poco::Logger::get(BridgeHelperMixin::getName() + "BridgeHelper");
 
     std::optional<IdentifierQuotingStyle> quote_style;
+    std::optional<bool> is_schema_allowed;
 
 protected:
     auto getConnectionString() const
@@ -80,6 +82,7 @@ class XDBCBridgeHelper : public IXDBCBridgeHelper
     static constexpr inline auto MAIN_HANDLER = "/";
     static constexpr inline auto COL_INFO_HANDLER = "/columns_info";
     static constexpr inline auto IDENTIFIER_QUOTE_HANDLER = "/identifier_quote";
+    static constexpr inline auto SCHEMA_ALLOWED_HANDLER = "/schema_allowed";
     static constexpr inline auto PING_OK_ANSWER = "Ok.";
 
     XDBCBridgeHelper(const Context & global_context_, const Poco::Timespan & http_timeout_, const std::string & connection_string_)
@@ -128,6 +131,27 @@ class XDBCBridgeHelper : public IXDBCBridgeHelper
         return *quote_style;
     }
 
+    bool isSchemaAllowed() override
+    {
+        if (!is_schema_allowed.has_value())
+        {
+            startBridgeSync();
+
+            auto uri = createBaseURI();
+            uri.setPath(SCHEMA_ALLOWED_HANDLER);
+            uri.addQueryParameter("connection_string", getConnectionString());
+
+            ReadWriteBufferFromHTTP buf(
+                uri, Poco::Net::HTTPRequest::HTTP_POST, {}, ConnectionTimeouts::getHTTPTimeouts(context));
+
+            bool res;
+            readBoolText(res, buf);
+            is_schema_allowed = res;
+        }
+
+        return *is_schema_allowed;
+    }
+
     /**
      * @todo leaky abstraction - used by external API's
      */

src/Dictionaries/CassandraDictionarySource.cpp

@@ -102,7 +102,7 @@ CassandraDictionarySource::CassandraDictionarySource(
     , dict_struct(dict_struct_)
     , settings(settings_)
     , sample_block(sample_block_)
-    , query_builder(dict_struct, settings.db, settings.table, settings.where, IdentifierQuotingStyle::DoubleQuotes)
+    , query_builder(dict_struct, settings.db, "", settings.table, settings.where, IdentifierQuotingStyle::DoubleQuotes)
 {
     cassandraCheck(cass_cluster_set_contact_points(cluster, settings.host.c_str()));
     if (settings.port)

src/Dictionaries/ClickHouseDictionarySource.cpp

@@ -66,7 +66,7 @@ ClickHouseDictionarySource::ClickHouseDictionarySource(
     , where{config.getString(config_prefix + ".where", "")}
     , update_field{config.getString(config_prefix + ".update_field", "")}
     , invalidate_query{config.getString(config_prefix + ".invalidate_query", "")}
-    , query_builder{dict_struct, db, table, where, IdentifierQuotingStyle::Backticks}
+    , query_builder{dict_struct, db, "", table, where, IdentifierQuotingStyle::Backticks}
     , sample_block{sample_block_}
     , context(context_)
     , is_local{isLocalAddress({host, port}, secure ? context.getTCPPortSecure().value_or(0) : context.getTCPPort())}
@@ -97,7 +97,7 @@ ClickHouseDictionarySource::ClickHouseDictionarySource(const ClickHouseDictionar
     , update_field{other.update_field}
     , invalidate_query{other.invalidate_query}
     , invalidate_query_response{other.invalidate_query_response}
-    , query_builder{dict_struct, db, table, where, IdentifierQuotingStyle::Backticks}
+    , query_builder{dict_struct, db, "", table, where, IdentifierQuotingStyle::Backticks}
     , sample_block{other.sample_block}
     , context(other.context)
     , is_local{other.is_local}

src/Dictionaries/ExternalQueryBuilder.cpp

@@ -19,22 +19,12 @@ namespace ErrorCodes
 ExternalQueryBuilder::ExternalQueryBuilder(
     const DictionaryStructure & dict_struct_,
     const std::string & db_,
+    const std::string & schema_,
     const std::string & table_,
     const std::string & where_,
     IdentifierQuotingStyle quoting_style_)
-    : dict_struct(dict_struct_), db(db_), where(where_), quoting_style(quoting_style_)
-{
-    if (auto pos = table_.find('.'); pos != std::string::npos)
-    {
-        schema = table_.substr(0, pos);
-        table = table_.substr(pos + 1);
-    }
-    else
-    {
-        schema = "";
-        table = table_;
-    }
-}
+    : dict_struct(dict_struct_), db(db_), schema(schema_), table(table_), where(where_), quoting_style(quoting_style_)
+{}
 
 
 void ExternalQueryBuilder::writeQuoted(const std::string & s, WriteBuffer & out) const

src/Dictionaries/ExternalQueryBuilder.h

@@ -18,8 +18,8 @@ struct ExternalQueryBuilder
 {
     const DictionaryStructure & dict_struct;
     std::string db;
-    std::string table;
     std::string schema;
+    std::string table;
     const std::string & where;
 
     IdentifierQuotingStyle quoting_style;
@@ -28,6 +28,7 @@ struct ExternalQueryBuilder
     ExternalQueryBuilder(
         const DictionaryStructure & dict_struct_,
         const std::string & db_,
+        const std::string & schema_,
         const std::string & table_,
         const std::string & where_,
         IdentifierQuotingStyle quoting_style_);

src/Dictionaries/MySQLDictionarySource.cpp

@@ -68,7 +68,7 @@ MySQLDictionarySource::MySQLDictionarySource(
     , dont_check_update_time{config.getBool(config_prefix + ".dont_check_update_time", false)}
     , sample_block{sample_block_}
     , pool{mysqlxx::PoolFactory::instance().get(config, config_prefix)}
-    , query_builder{dict_struct, db, table, where, IdentifierQuotingStyle::Backticks}
+    , query_builder{dict_struct, db, "", table, where, IdentifierQuotingStyle::Backticks}
     , load_all_query{query_builder.composeLoadAllQuery()}
     , invalidate_query{config.getString(config_prefix + ".invalidate_query", "")}
     , close_connection{config.getBool(config_prefix + ".close_connection", false) || config.getBool(config_prefix + ".share_connection", false)}
@@ -87,7 +87,7 @@ MySQLDictionarySource::MySQLDictionarySource(const MySQLDictionarySource & other
     , dont_check_update_time{other.dont_check_update_time}
     , sample_block{other.sample_block}
     , pool{other.pool}
-    , query_builder{dict_struct, db, table, where, IdentifierQuotingStyle::Backticks}
+    , query_builder{dict_struct, db, "", table, where, IdentifierQuotingStyle::Backticks}
     , load_all_query{other.load_all_query}
     , last_modification{other.last_modification}
     , invalidate_query{other.invalidate_query}

src/Dictionaries/XDBCDictionarySource.cpp

@@ -27,6 +27,7 @@ namespace DB
 namespace ErrorCodes
 {
     extern const int SUPPORT_IS_DISABLED;
+    extern const int ILLEGAL_TYPE_OF_ARGUMENT;
 }
 
 namespace
@@ -60,6 +61,39 @@ namespace
         std::unique_ptr<ReadWriteBufferFromHTTP> read_buf;
         BlockInputStreamPtr reader;
     };
+
+
+    ExternalQueryBuilder makeExternalQueryBuilder(const DictionaryStructure & dict_struct_,
+                                                  const std::string & db_,
+                                                  const std::string & schema_,
+                                                  const std::string & table_,
+                                                  const std::string & where_,
+                                                  IXDBCBridgeHelper & bridge_)
+    {
+        std::string schema = schema_;
+        std::string table = table_;
+
+        if (bridge_.isSchemaAllowed())
+        {
+            if (schema.empty())
+            {
+                if (auto pos = table.find('.'); pos != std::string::npos)
+                {
+                    schema = table.substr(0, pos);
+                    table = table.substr(pos + 1);
+                }
+            }
+        }
+        else
+        {
+            if (!schema.empty())
+                throw Exception{"Dictionary source of type " + bridge_.getName() + " specifies a schema but schema is not supported by "
+                                    + bridge_.getName() + "-driver",
+                                ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
+        }
+
+        return {dict_struct_, db_, schema, table, where_, bridge_.getIdentifierQuotingStyle()};
+    }
 }
 
 static const UInt64 max_block_size = 8192;
@@ -76,11 +110,12 @@ XDBCDictionarySource::XDBCDictionarySource(
     , update_time{std::chrono::system_clock::from_time_t(0)}
     , dict_struct{dict_struct_}
     , db{config_.getString(config_prefix_ + ".db", "")}
+    , schema{config_.getString(config_prefix_ + ".schema", "")}
     , table{config_.getString(config_prefix_ + ".table")}
     , where{config_.getString(config_prefix_ + ".where", "")}
     , update_field{config_.getString(config_prefix_ + ".update_field", "")}
     , sample_block{sample_block_}
-    , query_builder{dict_struct, db, table, where, bridge_->getIdentifierQuotingStyle()}
+    , query_builder{makeExternalQueryBuilder(dict_struct, db, schema, table, where, *bridge_)}
     , load_all_query{query_builder.composeLoadAllQuery()}
     , invalidate_query{config_.getString(config_prefix_ + ".invalidate_query", "")}
     , bridge_helper{bridge_}
@@ -104,7 +139,7 @@ XDBCDictionarySource::XDBCDictionarySource(const XDBCDictionarySource & other)
     , where{other.where}
     , update_field{other.update_field}
     , sample_block{other.sample_block}
-    , query_builder{dict_struct, db, table, where, other.bridge_helper->getIdentifierQuotingStyle()}
+    , query_builder{other.query_builder}
     , load_all_query{other.load_all_query}
     , invalidate_query{other.invalidate_query}
     , invalidate_query_response{other.invalidate_query_response}

src/Dictionaries/XDBCDictionarySource.h

@@ -69,6 +69,7 @@ class XDBCDictionarySource final : public IDictionarySource
     std::chrono::time_point<std::chrono::system_clock> update_time;
     const DictionaryStructure dict_struct;
     const std::string db;
+    const std::string schema;
     const std::string table;
     const std::string where;
     const std::string update_field;