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Lets add LocalConnection (a start)

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This commit is contained in:
kssenii 2021-08-17 22:59:51 +03:00
parent cefd9b473e
commit fb0b445ee0
13 changed files with 992 additions and 523 deletions
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379
programs/client/Client.cpp
View File

@ -51,7 +51,6 @@
#include <IO/Operators.h>
#include <IO/WriteBufferFromOStream.h>
#include <DataStreams/InternalTextLogsRowOutputStream.h>
#include <DataStreams/NullBlockOutputStream.h>
#include <Parsers/ASTCreateQuery.h>
@ -65,7 +64,6 @@
#include <Parsers/formatAST.h>
#include <Interpreters/InterpreterSetQuery.h>
#include <Interpreters/ReplaceQueryParameterVisitor.h>
#include <Functions/registerFunctions.h>
#include <AggregateFunctions/registerAggregateFunctions.h>
@ -289,7 +287,7 @@ static bool queryHasWithClause(const IAST * ast)
std::vector<String> Client::loadWarningMessages()
{
std::vector<String> messages;
connection->sendQuery(connection_parameters.timeouts, "SELECT message FROM system.warnings", "" /* query_id */, QueryProcessingStage::Complete);
connection->sendQuery(connection_parameters.timeouts, "SELECT message FROM system.warnings", "" /* query_id */, QueryProcessingStage::Complete, nullptr, nullptr, false);
while (true)
{
Packet packet = connection->receivePacket();
@ -930,21 +928,6 @@ bool Client::processWithFuzzing(const String & full_query)
}
/// Convert external tables to ExternalTableData and send them using the connection.
void Client::sendExternalTables(ASTPtr parsed_query)
{
const auto * select = parsed_query->as<ASTSelectWithUnionQuery>();
if (!select && !external_tables.empty())
throw Exception("External tables could be sent only with select query", ErrorCodes::BAD_ARGUMENTS);
std::vector<ExternalTableDataPtr> data;
for (auto & table : external_tables)
data.emplace_back(table.getData(global_context));
connection->sendExternalTablesData(data);
}
void Client::processInsertQuery(const String & query_to_execute, ASTPtr parsed_query)
{
/// Process the query that requires transferring data blocks to the server.
@ -976,61 +959,6 @@ void Client::processInsertQuery(const String & query_to_execute, ASTPtr parsed_q
}
void Client::processOrdinaryQuery(const String & query_to_execute, ASTPtr parsed_query)
{
/// Rewrite query only when we have query parameters.
/// Note that if query is rewritten, comments in query are lost.
/// But the user often wants to see comments in server logs, query log, processlist, etc.
auto query = query_to_execute;
if (!query_parameters.empty())
{
/// Replace ASTQueryParameter with ASTLiteral for prepared statements.
ReplaceQueryParameterVisitor visitor(query_parameters);
visitor.visit(parsed_query);
/// Get new query after substitutions. Note that it cannot be done for INSERT query with embedded data.
query = serializeAST(*parsed_query);
}
int retries_left = 10;
for (;;)
{
assert(retries_left > 0);
try
{
connection->sendQuery(
connection_parameters.timeouts,
query,
global_context->getCurrentQueryId(),
query_processing_stage,
&global_context->getSettingsRef(),
&global_context->getClientInfo(),
true);
sendExternalTables(parsed_query);
receiveResult(parsed_query);
break;
}
catch (const Exception & e)
{
/// Retry when the server said "Client should retry" and no rows
/// has been received yet.
if (processed_rows == 0 && e.code() == ErrorCodes::DEADLOCK_AVOIDED && --retries_left)
{
std::cerr << "Got a transient error from the server, will"
<< " retry (" << retries_left << " retries left)";
}
else
{
throw;
}
}
}
}
void Client::executeSingleQuery(const String & query_to_execute, ASTPtr parsed_query)
{
client_exception.reset();
@ -1196,7 +1124,7 @@ void Client::sendDataFrom(ReadBuffer & buf, Block & sample, const ColumnsDescrip
receiveLogs(parsed_query);
/// Check if server send Exception packet
auto packet_type = connection->checkPacket();
auto packet_type = connection->checkPacket(/* timeout_milliseconds */0);
if (packet_type && *packet_type == Protocol::Server::Exception)
{
/*
@ -1209,137 +1137,12 @@ void Client::sendDataFrom(ReadBuffer & buf, Block & sample, const ColumnsDescrip
if (block)
{
connection->sendData(block);
connection->sendData(block, /* name */"", /* scalar */false);
processed_rows += block.rows();
}
}
connection->sendData({});
}
/// Receives and processes packets coming from server.
/// Also checks if query execution should be cancelled.
void Client::receiveResult(ASTPtr parsed_query)
{
InterruptListener interrupt_listener;
bool cancelled = false;
// TODO: get the poll_interval from commandline.
const auto receive_timeout = connection_parameters.timeouts.receive_timeout;
constexpr size_t default_poll_interval = 1000000; /// in microseconds
constexpr size_t min_poll_interval = 5000; /// in microseconds
const size_t poll_interval
= std::max(min_poll_interval, std::min<size_t>(receive_timeout.totalMicroseconds(), default_poll_interval));
while (true)
{
Stopwatch receive_watch(CLOCK_MONOTONIC_COARSE);
while (true)
{
/// Has the Ctrl+C been pressed and thus the query should be cancelled?
/// If this is the case, inform the server about it and receive the remaining packets
/// to avoid losing sync.
if (!cancelled)
{
auto cancel_query = [&] {
connection->sendCancel();
cancelled = true;
if (is_interactive)
{
progress_indication.clearProgressOutput();
std::cout << "Cancelling query." << std::endl;
}
/// Pressing Ctrl+C twice results in shut down.
interrupt_listener.unblock();
};
if (interrupt_listener.check())
{
cancel_query();
}
else
{
double elapsed = receive_watch.elapsedSeconds();
if (elapsed > receive_timeout.totalSeconds())
{
std::cout << "Timeout exceeded while receiving data from server."
<< " Waited for " << static_cast<size_t>(elapsed) << " seconds,"
<< " timeout is " << receive_timeout.totalSeconds() << " seconds." << std::endl;
cancel_query();
}
}
}
/// Poll for changes after a cancellation check, otherwise it never reached
/// because of progress updates from server.
if (connection->poll(poll_interval))
break;
}
if (!receiveAndProcessPacket(parsed_query, cancelled))
break;
}
if (cancelled && is_interactive)
std::cout << "Query was cancelled." << std::endl;
}
/// Receive a part of the result, or progress info or an exception and process it.
/// Returns true if one should continue receiving packets.
/// Output of result is suppressed if query was cancelled.
bool Client::receiveAndProcessPacket(ASTPtr parsed_query, bool cancelled)
{
Packet packet = connection->receivePacket();
switch (packet.type)
{
case Protocol::Server::PartUUIDs:
return true;
case Protocol::Server::Data:
if (!cancelled)
onData(packet.block, parsed_query);
return true;
case Protocol::Server::Progress:
onProgress(packet.progress);
return true;
case Protocol::Server::ProfileInfo:
onProfileInfo(packet.profile_info);
return true;
case Protocol::Server::Totals:
if (!cancelled)
onTotals(packet.block, parsed_query);
return true;
case Protocol::Server::Extremes:
if (!cancelled)
onExtremes(packet.block, parsed_query);
return true;
case Protocol::Server::Exception:
onReceiveExceptionFromServer(std::move(packet.exception));
return false;
case Protocol::Server::Log:
onLogData(packet.block);
return true;
case Protocol::Server::EndOfStream:
onEndOfStream();
return false;
default:
throw Exception(
ErrorCodes::UNKNOWN_PACKET_FROM_SERVER, "Unknown packet {} from server {}", packet.type, connection->getDescription());
}
connection->sendData({}, "", false);
}
@ -1412,192 +1215,22 @@ bool Client::receiveEndOfQuery()
/// Process Log packets, used when inserting data by blocks
void Client::receiveLogs(ASTPtr parsed_query)
{
auto packet_type = connection->checkPacket();
auto packet_type = connection->checkPacket(0);
while (packet_type && *packet_type == Protocol::Server::Log)
{
receiveAndProcessPacket(parsed_query, false);
packet_type = connection->checkPacket();
packet_type = connection->checkPacket(/* timeout_milliseconds */0);
}
}
void Client::initBlockOutputStream(const Block & block, ASTPtr parsed_query)
{
if (!block_out_stream)
{
/// Ignore all results when fuzzing as they can be huge.
if (query_fuzzer_runs)
{
block_out_stream = std::make_shared<NullBlockOutputStream>(block);
return;
}
WriteBuffer * out_buf = nullptr;
String pager = config().getString("pager", "");
if (!pager.empty())
{
signal(SIGPIPE, SIG_IGN);
pager_cmd = ShellCommand::execute(pager, true);
out_buf = &pager_cmd->in;
}
else
{
out_buf = &std_out;
}
String current_format = format;
/// The query can specify output format or output file.
/// FIXME: try to prettify this cast using `as<>()`
if (const auto * query_with_output = dynamic_cast<const ASTQueryWithOutput *>(parsed_query.get()))
{
if (query_with_output->out_file)
{
const auto & out_file_node = query_with_output->out_file->as<ASTLiteral &>();
const auto & out_file = out_file_node.value.safeGet<std::string>();
out_file_buf = wrapWriteBufferWithCompressionMethod(
std::make_unique<WriteBufferFromFile>(out_file, DBMS_DEFAULT_BUFFER_SIZE, O_WRONLY | O_EXCL | O_CREAT),
chooseCompressionMethod(out_file, ""),
/* compression level = */ 3
);
// We are writing to file, so default format is the same as in non-interactive mode.
if (is_interactive && is_default_format)
current_format = "TabSeparated";
}
if (query_with_output->format != nullptr)
{
if (has_vertical_output_suffix)
throw Exception("Output format already specified", ErrorCodes::CLIENT_OUTPUT_FORMAT_SPECIFIED);
const auto & id = query_with_output->format->as<ASTIdentifier &>();
current_format = id.name();
}
}
if (has_vertical_output_suffix)
current_format = "Vertical";
/// It is not clear how to write progress with parallel formatting. It may increase code complexity significantly.
if (!need_render_progress)
block_out_stream = global_context->getOutputStreamParallelIfPossible(current_format, out_file_buf ? *out_file_buf : *out_buf, block);
else
block_out_stream = global_context->getOutputStream(current_format, out_file_buf ? *out_file_buf : *out_buf, block);
block_out_stream->writePrefix();
}
}
void Client::initLogsOutputStream()
{
if (!logs_out_stream)
{
WriteBuffer * wb = out_logs_buf.get();
if (!out_logs_buf)
{
if (server_logs_file.empty())
{
/// Use stderr by default
out_logs_buf = std::make_unique<WriteBufferFromFileDescriptor>(STDERR_FILENO);
wb = out_logs_buf.get();
}
else if (server_logs_file == "-")
{
/// Use stdout if --server_logs_file=- specified
wb = &std_out;
}
else
{
out_logs_buf
= std::make_unique<WriteBufferFromFile>(server_logs_file, DBMS_DEFAULT_BUFFER_SIZE, O_WRONLY | O_APPEND | O_CREAT);
wb = out_logs_buf.get();
}
}
logs_out_stream = std::make_shared<InternalTextLogsRowOutputStream>(*wb, stdout_is_a_tty);
logs_out_stream->writePrefix();
}
}
void Client::onData(Block & block, ASTPtr parsed_query)
{
if (!block)
return;
processed_rows += block.rows();
/// Even if all blocks are empty, we still need to initialize the output stream to write empty resultset.
initBlockOutputStream(block, parsed_query);
/// The header block containing zero rows was used to initialize
/// block_out_stream, do not output it.
/// Also do not output too much data if we're fuzzing.
if (block.rows() == 0 || (query_fuzzer_runs != 0 && processed_rows >= 100))
return;
if (need_render_progress)
progress_indication.clearProgressOutput();
block_out_stream->write(block);
written_first_block = true;
/// Received data block is immediately displayed to the user.
block_out_stream->flush();
/// Restore progress bar after data block.
if (need_render_progress)
progress_indication.writeProgress();
}
void Client::onLogData(Block & block)
{
initLogsOutputStream();
progress_indication.clearProgressOutput();
logs_out_stream->write(block);
logs_out_stream->flush();
}
void Client::onTotals(Block & block, ASTPtr parsed_query)
{
initBlockOutputStream(block, parsed_query);
block_out_stream->setTotals(block);
}
void Client::onExtremes(Block & block, ASTPtr parsed_query)
{
initBlockOutputStream(block, parsed_query);
block_out_stream->setExtremes(block);
}
void Client::writeFinalProgress()
{
progress_indication.writeFinalProgress();
}
void Client::onReceiveExceptionFromServer(std::unique_ptr<Exception> && e)
{
have_error = true;
server_exception = std::move(e);
resetOutput();
}
void Client::onProfileInfo(const BlockStreamProfileInfo & profile_info)
{
if (profile_info.hasAppliedLimit() && block_out_stream)
block_out_stream->setRowsBeforeLimit(profile_info.getRowsBeforeLimit());
}
void Client::readArguments(int argc, char ** argv, Arguments & common_arguments, std::vector<Arguments> & external_tables_arguments)
{
/** We allow different groups of arguments:

37
programs/client/Client.h
View File

@ -1,7 +1,6 @@
#pragma once
#include <Client/ClientBase.h>
#include <Core/ExternalTable.h>
namespace DB
@ -42,21 +41,9 @@ protected:
void processOptions(const OptionsDescription & options_description,
const CommandLineOptions & options,
const std::vector<Arguments> & external_tables_arguments) override;
void processConfig() override;
void processConfig() override;
private:
std::unique_ptr<Connection> connection; /// Connection to DB.
ConnectionParameters connection_parameters;
/// The last exception that was received from the server. Is used for the
/// return code in batch mode.
std::unique_ptr<Exception> server_exception;
/// Likewise, the last exception that occurred on the client.
std::unique_ptr<Exception> client_exception;
String format; /// Query results output format.
bool is_default_format = true; /// false, if format is set in the config or command line.
size_t format_max_block_size = 0; /// Max block size for console output.
String insert_format; /// Format of INSERT data that is read from stdin in batch mode.
size_t insert_format_max_block_size = 0; /// Max block size when reading INSERT data.
@ -65,42 +52,22 @@ private:
UInt64 server_revision = 0;
String server_version;
/// External tables info.
std::list<ExternalTable> external_tables;
/// Dictionary with query parameters for prepared statements.
NameToNameMap query_parameters;
QueryProcessingStage::Enum query_processing_stage;
String current_profile;
void connect();
void connect() override;
void printChangedSettings() const;
void sendExternalTables(ASTPtr parsed_query);
void processInsertQuery(const String & query_to_execute, ASTPtr parsed_query);
void processOrdinaryQuery(const String & query_to_execute, ASTPtr parsed_query);
void sendData(Block & sample, const ColumnsDescription & columns_description, ASTPtr parsed_query);
void sendDataFrom(ReadBuffer & buf, Block & sample,
const ColumnsDescription & columns_description, ASTPtr parsed_query);
void receiveResult(ASTPtr parsed_query);
void receiveLogs(ASTPtr parsed_query);
bool receiveEndOfQuery();
bool receiveAndProcessPacket(ASTPtr parsed_query, bool cancelled);
bool receiveSampleBlock(Block & out, ColumnsDescription & columns_description, ASTPtr parsed_query);
void initBlockOutputStream(const Block & block, ASTPtr parsed_query);
void initLogsOutputStream();
void onData(Block & block, ASTPtr parsed_query);
void onLogData(Block & block);
void onTotals(Block & block, ASTPtr parsed_query);
void onExtremes(Block & block, ASTPtr parsed_query);
void writeFinalProgress();
void onReceiveExceptionFromServer(std::unique_ptr<Exception> && e);
void onProfileInfo(const BlockStreamProfileInfo & profile_info);
std::vector<String> loadWarningMessages();
void reconnectIfNeeded()

23
programs/local/LocalServer.cpp
View File

@ -257,10 +257,10 @@ void LocalServer::checkInterruptListener()
}
void LocalServer::executeSingleQuery(const String & query_to_execute, ASTPtr /* parsed_query */)
void LocalServer::executeSingleQuery(const String & query_to_execute, ASTPtr parsed_query)
{
ReadBufferFromString read_buf(query_to_execute);
WriteBufferFromFileDescriptor write_buf(STDOUT_FILENO);
// ReadBufferFromString read_buf(query_to_execute);
// WriteBufferFromFileDescriptor write_buf(STDOUT_FILENO);
cancelled = false;
@ -291,8 +291,8 @@ void LocalServer::executeSingleQuery(const String & query_to_execute, ASTPtr /*
};
}
if (is_interactive)
interrupt_listener.emplace();
// if (is_interactive)
// interrupt_listener.emplace();
SCOPE_EXIT_SAFE({
if (interrupt_listener)
@ -310,7 +310,7 @@ void LocalServer::executeSingleQuery(const String & query_to_execute, ASTPtr /*
try
{
executeQuery(read_buf, write_buf, /* allow_into_outfile = */ true, query_context, {}, {}, flush_buffer_func);
processOrdinaryQuery(query_to_execute, parsed_query);
}
catch (const Exception & e)
{
@ -473,6 +473,8 @@ try
progress_indication.setFileProgressCallback(query_context);
}
connect();
if (is_interactive)
{
std::cout << std::endl;
@ -563,6 +565,12 @@ void LocalServer::processConfig()
if (config().has("macros"))
global_context->setMacros(std::make_unique<Macros>(config(), "macros", log));
is_default_format = !config().has("vertical") && !config().has("format");
if (config().has("vertical"))
format = config().getString("format", "Vertical");
else
format = config().getString("format", is_interactive ? "PrettyCompact" : "TabSeparated");
/// Skip networking
/// Sets external authenticators config (LDAP, Kerberos).
@ -631,6 +639,9 @@ void LocalServer::processConfig()
std::map<String, String> prompt_substitutions{{"display_name", server_display_name}};
for (const auto & [key, value] : prompt_substitutions)
boost::replace_all(prompt_by_server_display_name, "{" + key + "}", value);
ClientInfo & client_info = global_context->getClientInfo();
client_info.setInitialQuery();
}

7
programs/local/LocalServer.h
View File

@ -1,6 +1,7 @@
#pragma once
#include <Client/ClientBase.h>
#include <Client/LocalConnection.h>
#include <Common/ProgressIndication.h>
#include <Common/StatusFile.h>
@ -34,6 +35,12 @@ public:
}
protected:
void connect() override
{
connection_parameters = ConnectionParameters(config());
connection = std::make_unique<LocalConnection>(global_context);
}
void processSingleQuery(const String & full_query) override;
bool processMultiQuery(const String & all_queries_text) override;

376
src/Client/ClientBase.cpp
View File

@ -19,6 +19,7 @@
#include <Common/StringUtils/StringUtils.h>
#include <Common/filesystemHelpers.h>
#include <Common/Config/configReadClient.h>
#include <Common/InterruptListener.h>
#include <Client/ClientBaseHelpers.h>
@ -36,10 +37,13 @@
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTIdentifier.h>
#include <Interpreters/ReplaceQueryParameterVisitor.h>
#include <IO/WriteBufferFromOStream.h>
#include <DataStreams/NullBlockOutputStream.h>
#include <IO/UseSSL.h>
#include <DataStreams/NullBlockOutputStream.h>
#include <DataStreams/InternalTextLogsRowOutputStream.h>
namespace fs = std::filesystem;
@ -51,6 +55,9 @@ static const NameSet exit_strings{"exit", "quit", "logout", "учше", "йгш
namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
extern const int DEADLOCK_AVOIDED;
extern const int CLIENT_OUTPUT_FORMAT_SPECIFIED;
extern const int UNKNOWN_PACKET_FROM_SERVER;
}
}
@ -144,6 +151,371 @@ static void adjustQueryEnd(const char *& this_query_end, const char * all_querie
}
/// Convert external tables to ExternalTableData and send them using the connection.
void ClientBase::sendExternalTables(ASTPtr parsed_query)
{
const auto * select = parsed_query->as<ASTSelectWithUnionQuery>();
if (!select && !external_tables.empty())
throw Exception("External tables could be sent only with select query", ErrorCodes::BAD_ARGUMENTS);
std::vector<ExternalTableDataPtr> data;
for (auto & table : external_tables)
data.emplace_back(table.getData(global_context));
connection->sendExternalTablesData(data);
}
void ClientBase::onData(Block & block, ASTPtr parsed_query)
{
if (!block)
return;
processed_rows += block.rows();
/// Even if all blocks are empty, we still need to initialize the output stream to write empty resultset.
initBlockOutputStream(block, parsed_query);
/// The header block containing zero rows was used to initialize
/// block_out_stream, do not output it.
/// Also do not output too much data if we're fuzzing.
if (block.rows() == 0 || (query_fuzzer_runs != 0 && processed_rows >= 100))
return;
if (need_render_progress)
progress_indication.clearProgressOutput();
block_out_stream->write(block);
written_first_block = true;
/// Received data block is immediately displayed to the user.
block_out_stream->flush();
/// Restore progress bar after data block.
if (need_render_progress)
progress_indication.writeProgress();
}
void ClientBase::onLogData(Block & block)
{
initLogsOutputStream();
progress_indication.clearProgressOutput();
logs_out_stream->write(block);
logs_out_stream->flush();
}
void ClientBase::onTotals(Block & block, ASTPtr parsed_query)
{
initBlockOutputStream(block, parsed_query);
block_out_stream->setTotals(block);
}
void ClientBase::onExtremes(Block & block, ASTPtr parsed_query)
{
initBlockOutputStream(block, parsed_query);
block_out_stream->setExtremes(block);
}
void ClientBase::onReceiveExceptionFromServer(std::unique_ptr<Exception> && e)
{
have_error = true;
server_exception = std::move(e);
resetOutput();
}
void ClientBase::onProfileInfo(const BlockStreamProfileInfo & profile_info)
{
if (profile_info.hasAppliedLimit() && block_out_stream)
block_out_stream->setRowsBeforeLimit(profile_info.getRowsBeforeLimit());
}
void ClientBase::initBlockOutputStream(const Block & block, ASTPtr parsed_query)
{
if (!block_out_stream)
{
/// Ignore all results when fuzzing as they can be huge.
if (query_fuzzer_runs)
{
block_out_stream = std::make_shared<NullBlockOutputStream>(block);
return;
}
WriteBuffer * out_buf = nullptr;
String pager = config().getString("pager", "");
if (!pager.empty())
{
signal(SIGPIPE, SIG_IGN);
pager_cmd = ShellCommand::execute(pager, true);
out_buf = &pager_cmd->in;
}
else
{
out_buf = &std_out;
}
String current_format = format;
/// The query can specify output format or output file.
/// FIXME: try to prettify this cast using `as<>()`
if (const auto * query_with_output = dynamic_cast<const ASTQueryWithOutput *>(parsed_query.get()))
{
if (query_with_output->out_file)
{
const auto & out_file_node = query_with_output->out_file->as<ASTLiteral &>();
const auto & out_file = out_file_node.value.safeGet<std::string>();
out_file_buf = wrapWriteBufferWithCompressionMethod(
std::make_unique<WriteBufferFromFile>(out_file, DBMS_DEFAULT_BUFFER_SIZE, O_WRONLY | O_EXCL | O_CREAT),
chooseCompressionMethod(out_file, ""),
/* compression level = */ 3
);
// We are writing to file, so default format is the same as in non-interactive mode.
if (is_interactive && is_default_format)
current_format = "TabSeparated";
}
if (query_with_output->format != nullptr)
{
if (has_vertical_output_suffix)
throw Exception("Output format already specified", ErrorCodes::CLIENT_OUTPUT_FORMAT_SPECIFIED);
const auto & id = query_with_output->format->as<ASTIdentifier &>();
current_format = id.name();
}
}
if (has_vertical_output_suffix)
current_format = "Vertical";
/// It is not clear how to write progress with parallel formatting. It may increase code complexity significantly.
if (!need_render_progress)
block_out_stream = global_context->getOutputStreamParallelIfPossible(current_format, out_file_buf ? *out_file_buf : *out_buf, block);
else
block_out_stream = global_context->getOutputStream(current_format, out_file_buf ? *out_file_buf : *out_buf, block);
block_out_stream->writePrefix();
}
}
void ClientBase::initLogsOutputStream()
{
if (!logs_out_stream)
{
WriteBuffer * wb = out_logs_buf.get();
if (!out_logs_buf)
{
if (server_logs_file.empty())
{
/// Use stderr by default
out_logs_buf = std::make_unique<WriteBufferFromFileDescriptor>(STDERR_FILENO);
wb = out_logs_buf.get();
}
else if (server_logs_file == "-")
{
/// Use stdout if --server_logs_file=- specified
wb = &std_out;
}
else
{
out_logs_buf
= std::make_unique<WriteBufferFromFile>(server_logs_file, DBMS_DEFAULT_BUFFER_SIZE, O_WRONLY | O_APPEND | O_CREAT);
wb = out_logs_buf.get();
}
}
logs_out_stream = std::make_shared<InternalTextLogsRowOutputStream>(*wb, stdout_is_a_tty);
logs_out_stream->writePrefix();
}
}
void ClientBase::processOrdinaryQuery(const String & query_to_execute, ASTPtr parsed_query)
{
/// Rewrite query only when we have query parameters.
/// Note that if query is rewritten, comments in query are lost.
/// But the user often wants to see comments in server logs, query log, processlist, etc.
auto query = query_to_execute;
if (!query_parameters.empty())
{
/// Replace ASTQueryParameter with ASTLiteral for prepared statements.
ReplaceQueryParameterVisitor visitor(query_parameters);
visitor.visit(parsed_query);
/// Get new query after substitutions. Note that it cannot be done for INSERT query with embedded data.
query = serializeAST(*parsed_query);
}
int retries_left = 10;
for (;;)
{
assert(retries_left > 0);
try
{
connection->sendQuery(
connection_parameters.timeouts,
query,
global_context->getCurrentQueryId(),
query_processing_stage,
&global_context->getSettingsRef(),
&global_context->getClientInfo(),
true);
sendExternalTables(parsed_query);
receiveResult(parsed_query);
break;
}
catch (const Exception & e)
{
/// Retry when the server said "Client should retry" and no rows
/// has been received yet.
if (processed_rows == 0 && e.code() == ErrorCodes::DEADLOCK_AVOIDED && --retries_left)
{
std::cerr << "Got a transient error from the server, will"
<< " retry (" << retries_left << " retries left)";
}
else
{
throw;
}
}
}
}
/// Receives and processes packets coming from server.
/// Also checks if query execution should be cancelled.
void ClientBase::receiveResult(ASTPtr parsed_query)
{
InterruptListener interrupt_listener;
bool cancelled = false;
// TODO: get the poll_interval from commandline.
const auto receive_timeout = connection_parameters.timeouts.receive_timeout;
constexpr size_t default_poll_interval = 1000000; /// in microseconds
constexpr size_t min_poll_interval = 5000; /// in microseconds
const size_t poll_interval
= std::max(min_poll_interval, std::min<size_t>(receive_timeout.totalMicroseconds(), default_poll_interval));
while (true)
{
Stopwatch receive_watch(CLOCK_MONOTONIC_COARSE);
while (true)
{
/// Has the Ctrl+C been pressed and thus the query should be cancelled?
/// If this is the case, inform the server about it and receive the remaining packets
/// to avoid losing sync.
if (!cancelled)
{
auto cancel_query = [&] {
connection->sendCancel();
cancelled = true;
if (is_interactive)
{
progress_indication.clearProgressOutput();
std::cout << "Cancelling query." << std::endl;
}
/// Pressing Ctrl+C twice results in shut down.
interrupt_listener.unblock();
};
if (interrupt_listener.check())
{
cancel_query();
}
else
{
double elapsed = receive_watch.elapsedSeconds();
if (elapsed > receive_timeout.totalSeconds())
{
std::cout << "Timeout exceeded while receiving data from server."
<< " Waited for " << static_cast<size_t>(elapsed) << " seconds,"
<< " timeout is " << receive_timeout.totalSeconds() << " seconds." << std::endl;
cancel_query();
}
}
}
/// Poll for changes after a cancellation check, otherwise it never reached
/// because of progress updates from server.
if (connection->poll(poll_interval))
break;
}
if (!receiveAndProcessPacket(parsed_query, cancelled))
break;
}
if (cancelled && is_interactive)
std::cout << "Query was cancelled." << std::endl;
}
/// Receive a part of the result, or progress info or an exception and process it.
/// Returns true if one should continue receiving packets.
/// Output of result is suppressed if query was cancelled.
bool ClientBase::receiveAndProcessPacket(ASTPtr parsed_query, bool cancelled)
{
Packet packet = connection->receivePacket();
switch (packet.type)
{
case Protocol::Server::PartUUIDs:
return true;
case Protocol::Server::Data:
if (!cancelled)
onData(packet.block, parsed_query);
return true;
case Protocol::Server::Progress:
onProgress(packet.progress);
return true;
case Protocol::Server::ProfileInfo:
onProfileInfo(packet.profile_info);
return true;
case Protocol::Server::Totals:
if (!cancelled)
onTotals(packet.block, parsed_query);
return true;
case Protocol::Server::Extremes:
if (!cancelled)
onExtremes(packet.block, parsed_query);
return true;
case Protocol::Server::Exception:
onReceiveExceptionFromServer(std::move(packet.exception));
return false;
case Protocol::Server::Log:
onLogData(packet.block);
return true;
case Protocol::Server::EndOfStream:
onEndOfStream();
return false;
default:
throw Exception(
ErrorCodes::UNKNOWN_PACKET_FROM_SERVER, "Unknown packet {} from server {}", packet.type, connection->getDescription());
}
}
void ClientBase::onProgress(const Progress & value)
{
if (!progress_indication.updateProgress(value))
@ -221,10 +593,10 @@ void ClientBase::processSingleQueryImpl(const String & full_query, const String
std_out.next();
}
global_context->setCurrentQueryId("");
if (is_interactive)
{
// Generate a new query_id
global_context->setCurrentQueryId("");
for (const auto & query_id_format : query_id_formats)
{
writeString(query_id_format.first, std_out);

36
src/Client/ClientBase.h
View File

@ -7,6 +7,7 @@
#include <Client/Suggest.h>
#include <Client/QueryFuzzer.h>
#include <Common/ShellCommand.h>
#include <Core/ExternalTable.h>
namespace po = boost::program_options;
@ -34,6 +35,14 @@ public:
int main(const std::vector<String> & /*args*/) override;
protected:
void processOrdinaryQuery(const String & query_to_execute, ASTPtr parsed_query);
void receiveResult(ASTPtr parsed_query);
bool receiveAndProcessPacket(ASTPtr parsed_query, bool cancelled);
void initBlockOutputStream(const Block & block, ASTPtr parsed_query);
void initLogsOutputStream();
void sendExternalTables(ASTPtr parsed_query);
virtual void connect() = 0;
/*
* Run interactive or non-interactive mode. Depends on:
* - processSingleQuery
@ -97,6 +106,12 @@ protected:
virtual void loadSuggestionData(Suggest &) = 0;
void onData(Block & block, ASTPtr parsed_query);
void onLogData(Block & block);
void onTotals(Block & block, ASTPtr parsed_query);
void onExtremes(Block & block, ASTPtr parsed_query);
void onReceiveExceptionFromServer(std::unique_ptr<Exception> && e);
void onProfileInfo(const BlockStreamProfileInfo & profile_info);
void resetOutput();
@ -200,6 +215,27 @@ protected:
/// We will format query_id in interactive mode in various ways, the default is just to print Query id: ...
std::vector<std::pair<String, String>> query_id_formats;
/// Dictionary with query parameters for prepared statements.
NameToNameMap query_parameters;
std::unique_ptr<IServerConnection> connection;
ConnectionParameters connection_parameters;
String format; /// Query results output format.
bool is_default_format = true; /// false, if format is set in the config or command line.
/// The last exception that was received from the server. Is used for the
/// return code in batch mode.
std::unique_ptr<Exception> server_exception;
/// Likewise, the last exception that occurred on the client.
std::unique_ptr<Exception> client_exception;
QueryProcessingStage::Enum query_processing_stage;
/// External tables info.
std::list<ExternalTable> external_tables;
};
}

13
src/Client/Connection.cpp
View File

@ -499,7 +499,7 @@ void Connection::sendQuery(
/// Send empty block which means end of data.
if (!with_pending_data)
{
sendData(Block());
sendData(Block(), /* name */"", /* scalar */false);
out->next();
}
}
@ -654,7 +654,7 @@ protected:
num_rows += chunk.getNumRows();
auto block = getPort().getHeader().cloneWithColumns(chunk.detachColumns());
connection.sendData(block, table_data.table_name);
connection.sendData(block, table_data.table_name, /* scalar */false);
}
private:
@ -670,7 +670,7 @@ void Connection::sendExternalTablesData(ExternalTablesData & data)
if (data.empty())
{
/// Send empty block, which means end of data transfer.
sendData(Block());
sendData(Block(), "", false);
return;
}
@ -702,17 +702,16 @@ void Connection::sendExternalTablesData(ExternalTablesData & data)
});
executor = pipeline.execute();
executor->execute(/*num_threads = */ 1);
auto read_rows = sink->getNumReadRows();
auto read_rows = sink->getNumReadRows();
rows += read_rows;
/// If table is empty, send empty block with name.
if (read_rows == 0)
sendData(sink->getPort().getHeader(), elem->table_name);
sendData(sink->getPort().getHeader(), elem->table_name, /* scalar */false);
}
/// Send empty block, which means end of data transfer.
sendData(Block());
sendData(Block(), /* name */"", /* scalar */false);
out_bytes = out->count() - out_bytes;
maybe_compressed_out_bytes = maybe_compressed_out->count() - maybe_compressed_out_bytes;

135
src/Client/Connection.h
View File

@ -4,20 +4,13 @@
#include <Poco/Net/StreamSocket.h>
#include <Common/Throttler.h>
#if !defined(ARCADIA_BUILD)
# include <Common/config.h>
#endif
#include <Core/Block.h>
#include <Client/IServerConnection.h>
#include <Core/Defines.h>
#include <IO/Progress.h>
#include <Core/Protocol.h>
#include <Core/QueryProcessingStage.h>
#include <DataStreams/IBlockStream_fwd.h>
#include <DataStreams/BlockStreamProfileInfo.h>
#include <IO/ConnectionTimeouts.h>
#include <IO/ReadBufferFromPocoSocket.h>
#include <Interpreters/TablesStatus.h>
@ -31,46 +24,14 @@
namespace DB
{
class ClientInfo;
class Pipe;
struct Settings;
/// Struct which represents data we are going to send for external table.
struct ExternalTableData
{
/// Pipe of data form table;
std::unique_ptr<Pipe> pipe;
std::string table_name;
std::function<std::unique_ptr<Pipe>()> creating_pipe_callback;
/// Flag if need to stop reading.
std::atomic_bool is_cancelled = false;
};
using ExternalTableDataPtr = std::unique_ptr<ExternalTableData>;
using ExternalTablesData = std::vector<ExternalTableDataPtr>;
class Connection;
using ConnectionPtr = std::shared_ptr<Connection>;
using Connections = std::vector<ConnectionPtr>;
/// Packet that could be received from server.
struct Packet
{
UInt64 type;
Block block;
std::unique_ptr<Exception> exception;
std::vector<String> multistring_message;
Progress progress;
BlockStreamProfileInfo profile_info;
std::vector<UUID> part_uuids;
Packet() : type(Protocol::Server::Hello) {}
};
/** Connection with database server, to use by client.
* How to use - see Core/Protocol.h
* (Implementation of server end - see Server/TCPHandler.h)
@ -78,7 +39,7 @@ struct Packet
* As 'default_database' empty string could be passed
* - in that case, server will use it's own default database.
*/
class Connection : private boost::noncopyable
class Connection : public IServerConnection
{
friend class MultiplexedConnections;
@ -111,92 +72,77 @@ public:
setDescription();
}
virtual ~Connection() = default;
/// Set throttler of network traffic. One throttler could be used for multiple connections to limit total traffic.
void setThrottler(const ThrottlerPtr & throttler_)
void setThrottler(const ThrottlerPtr & throttler_) override
{
throttler = throttler_;
}
/// Change default database. Changes will take effect on next reconnect.
void setDefaultDatabase(const String & database);
void setDefaultDatabase(const String & database) override;
void getServerVersion(const ConnectionTimeouts & timeouts,
String & name,
UInt64 & version_major,
UInt64 & version_minor,
UInt64 & version_patch,
UInt64 & revision);
UInt64 getServerRevision(const ConnectionTimeouts & timeouts);
UInt64 & revision) override;
const String & getServerTimezone(const ConnectionTimeouts & timeouts);
const String & getServerDisplayName(const ConnectionTimeouts & timeouts);
UInt64 getServerRevision(const ConnectionTimeouts & timeouts) override;
const String & getServerTimezone(const ConnectionTimeouts & timeouts) override;
const String & getServerDisplayName(const ConnectionTimeouts & timeouts) override;
/// For log and exception messages.
const String & getDescription() const;
const String & getDescription() const override;
const String & getHost() const;
UInt16 getPort() const;
const String & getDefaultDatabase() const;
Protocol::Compression getCompression() const { return compression; }
/// If last flag is true, you need to call sendExternalTablesData after.
void sendQuery(
const ConnectionTimeouts & timeouts,
const String & query,
const String & query_id_ = "",
UInt64 stage = QueryProcessingStage::Complete,
const Settings * settings = nullptr,
const ClientInfo * client_info = nullptr,
bool with_pending_data = false);
const ConnectionTimeouts & timeouts, const String & query,
const String & query_id_, UInt64 stage,
const Settings * settings, const ClientInfo * client_info,
bool with_pending_database) override;
void sendCancel();
/// Send block of data; if name is specified, server will write it to external (temporary) table of that name.
void sendData(const Block & block, const String & name = "", bool scalar = false);
/// Send all scalars.
void sendScalarsData(Scalars & data);
/// Send all contents of external (temporary) tables.
void sendExternalTablesData(ExternalTablesData & data);
/// Send parts' uuids to excluded them from query processing
void sendIgnoredPartUUIDs(const std::vector<UUID> & uuids);
void sendCancel() override;
void sendData(const Block & block, const String & name, bool scalar) override;
void sendExternalTablesData(ExternalTablesData & data) override;
bool poll(size_t timeout_microseconds) override;
bool hasReadPendingData() const override;
std::optional<UInt64> checkPacket(size_t timeout_microseconds) override;
Packet receivePacket() override;
void forceConnected(const ConnectionTimeouts & timeouts) override;
bool isConnected() const override { return connected; }
bool checkConnected() override { return connected && ping(); }
void disconnect() override;
void sendReadTaskResponse(const String &);
/// Send prepared block of data (serialized and, if need, compressed), that will be read from 'input'.
/// You could pass size of serialized/compressed block.
void sendPreparedData(ReadBuffer & input, size_t size, const String & name = "");
/// Check, if has data to read.
bool poll(size_t timeout_microseconds = 0);
/// Check, if has data in read buffer.
bool hasReadPendingData() const;
/// Checks if there is input data in connection and reads packet ID.
std::optional<UInt64> checkPacket(size_t timeout_microseconds = 0);
/// Receive packet from server.
Packet receivePacket();
/// If not connected yet, or if connection is broken - then connect. If cannot connect - throw an exception.
void forceConnected(const ConnectionTimeouts & timeouts);
bool isConnected() const { return connected; }
/// Check if connection is still active with ping request.
bool checkConnected() { return connected && ping(); }
void sendReadTaskResponse(const String &);
/// Send all scalars.
void sendScalarsData(Scalars & data);
/// Send parts' uuids to excluded them from query processing
void sendIgnoredPartUUIDs(const std::vector<UUID> & uuids);
TablesStatusResponse getTablesStatus(const ConnectionTimeouts & timeouts,
const TablesStatusRequest & request);
/** Disconnect.
* This may be used, if connection is left in unsynchronised state
* (when someone continues to wait for something) after an exception.
*/
void disconnect();
size_t outBytesCount() const { return out ? out->count() : 0; }
size_t inBytesCount() const { return in ? in->count() : 0; }
@ -209,7 +155,6 @@ public:
if (in)
in->setAsyncCallback(std::move(async_callback));
}
private:
String host;
UInt16 port;

124
src/Client/IServerConnection.h Normal file
View File

@ -0,0 +1,124 @@
#pragma once
#include <Common/Throttler.h>
#include <Core/Types.h>
#include <Core/QueryProcessingStage.h>
#include <Core/Block.h>
#include <Core/Protocol.h>
#include <DataStreams/IBlockStream_fwd.h>
#include <DataStreams/BlockStreamProfileInfo.h>
#include <Processors/Pipe.h>
#include <IO/ConnectionTimeouts.h>
#include <IO/Progress.h>
#include <boost/noncopyable.hpp>
namespace DB
{
class ClientInfo;
/// Packet that could be received from server.
struct Packet
{
UInt64 type;
Block block;
std::unique_ptr<Exception> exception;
std::vector<String> multistring_message;
Progress progress;
BlockStreamProfileInfo profile_info;
std::vector<UUID> part_uuids;
Packet() : type(Protocol::Server::Hello) {}
};
/// Struct which represents data we are going to send for external table.
struct ExternalTableData
{
/// Pipe of data form table;
std::unique_ptr<Pipe> pipe;
std::string table_name;
std::function<std::unique_ptr<Pipe>()> creating_pipe_callback;
/// Flag if need to stop reading.
std::atomic_bool is_cancelled = false;
};
using ExternalTableDataPtr = std::unique_ptr<ExternalTableData>;
using ExternalTablesData = std::vector<ExternalTableDataPtr>;
class IServerConnection : boost::noncopyable
{
public:
virtual ~IServerConnection() = default;
virtual void setDefaultDatabase(const String & database) = 0;
virtual void getServerVersion(
const ConnectionTimeouts & timeouts, String & name,
UInt64 & version_major, UInt64 & version_minor,
UInt64 & version_patch, UInt64 & revision) = 0;
virtual UInt64 getServerRevision(const ConnectionTimeouts & timeouts) = 0;
virtual const String & getServerTimezone(const ConnectionTimeouts & timeouts) = 0;
virtual const String & getServerDisplayName(const ConnectionTimeouts & timeouts) = 0;
virtual const String & getDescription() const = 0;
/// If last flag is true, you need to call sendExternalTablesData after.
virtual void sendQuery(
const ConnectionTimeouts & timeouts,
const String & query,
const String & query_id_ /* = "" */,
UInt64 stage/* = QueryProcessingStage::Complete */,
const Settings * settings /* = nullptr */,
const ClientInfo * client_info /* = nullptr */,
bool with_pending_data /* = false */) = 0;
virtual void sendCancel() = 0;
/// Send block of data; if name is specified, server will write it to external (temporary) table of that name.
virtual void sendData(const Block & block, const String & name/* = "" */, bool scalar/* = false */) = 0;
/// Send all contents of external (temporary) tables.
virtual void sendExternalTablesData(ExternalTablesData & data) = 0;
/// Check, if has data to read.
virtual bool poll(size_t timeout_microseconds /* = 0 */) = 0;
/// Check, if has data in read buffer.
virtual bool hasReadPendingData() const = 0;
/// Checks if there is input data in connection and reads packet ID.
virtual std::optional<UInt64> checkPacket(size_t timeout_microseconds /* = 0 */) = 0;
/// Receive packet from server.
virtual Packet receivePacket() = 0;
/// If not connected yet, or if connection is broken - then connect. If cannot connect - throw an exception.
virtual void forceConnected(const ConnectionTimeouts & timeouts) = 0;
virtual bool isConnected() const = 0;
/// Check if connection is still active with ping request.
virtual bool checkConnected() = 0;
/** Disconnect.
* This may be used, if connection is left in unsynchronised state
* (when someone continues to wait for something) after an exception.
*/
virtual void disconnect() = 0;
/// Set throttler of network traffic. One throttler could be used for multiple connections to limit total traffic.
virtual void setThrottler(const ThrottlerPtr & throttler_) = 0;
};
using ServerConnection = std::unique_ptr<IServerConnection>;
}

215
src/Client/LocalConnection.cpp Normal file
View File

@ -0,0 +1,215 @@
#include "LocalConnection.h"
#include <Interpreters/executeQuery.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int UNKNOWN_PACKET_FROM_SERVER;
}
LocalConnection::LocalConnection(ContextPtr context_)
: WithContext(context_)
{
}
void LocalConnection::setDefaultDatabase(const String & database)
{
default_database = database;
}
void LocalConnection::getServerVersion(
const ConnectionTimeouts & /* timeouts */, String & name,
UInt64 & version_major, UInt64 & version_minor,
UInt64 & version_patch, UInt64 & revision)
{
name = server_name;
version_major = server_version_major;
version_minor = server_version_minor;
version_patch = server_version_patch;
revision = server_revision;
}
UInt64 LocalConnection::getServerRevision(const ConnectionTimeouts &)
{
return server_revision;
}
const String & LocalConnection::getDescription() const
{
return description;
}
const String & LocalConnection::getServerTimezone(const ConnectionTimeouts &)
{
return server_timezone;
}
const String & LocalConnection::getServerDisplayName(const ConnectionTimeouts &)
{
return server_display_name;
}
/*
* SendQuery: execute query and suspend the result, which will be received back via poll.
**/
void LocalConnection::sendQuery(
const ConnectionTimeouts &,
const String & query_,
const String & query_id_,
UInt64,
const Settings *,
const ClientInfo *,
bool)
{
query_context = Context::createCopy(getContext());
query_context->makeQueryContext();
query_context->setProgressCallback([this] (const Progress & value) { return this->updateProgress(value); });
/// query_context->setCurrentDatabase(default_database);
state.query_id = query_id_;
state.query = query_;
state.io = executeQuery(state.query, query_context, false, state.stage, false);
if (state.io.out)
{
state.need_receive_data_for_insert = true;
/// processInsertQuery();
}
else if (state.io.pipeline.initialized())
{
state.executor = std::make_unique<PullingAsyncPipelineExecutor>(state.io.pipeline);
}
else if (state.io.in)
{
state.async_in = std::make_unique<AsynchronousBlockInputStream>(state.io.in);
state.async_in->readPrefix();
}
}
void LocalConnection::sendCancel()
{
if (state.async_in)
{
state.async_in->cancel(false);
}
else if (state.executor)
{
state.executor->cancel();
}
}
Block LocalConnection::pullBlock()
{
Block block;
if (state.async_in)
{
if (state.async_in->poll(query_context->getSettingsRef().interactive_delay / 1000))
return state.async_in->read();
}
else if (state.executor)
{
state.executor->pull(block, query_context->getSettingsRef().interactive_delay / 1000);
}
return block;
}
void LocalConnection::finishQuery()
{
if (state.async_in)
{
state.async_in->readSuffix();
state.async_in.reset();
}
else if (state.executor)
{
state.executor.reset();
}
// sendProgress();
state.io.onFinish();
query_context.reset();
}
bool LocalConnection::poll(size_t)
{
if (after_send_progress.elapsed() / 1000 >= query_context->getSettingsRef().interactive_delay)
{
after_send_progress.restart();
next_packet_type = Protocol::Server::Progress;
return true;
}
auto block = pullBlock();
if (block)
{
next_packet_type = Protocol::Server::Data;
if (state.io.null_format)
state.block.emplace();
else
state.block.emplace(block);
}
else
{
state.is_finished = true;
next_packet_type = Protocol::Server::EndOfStream;
}
return true;
}
Packet LocalConnection::receivePacket()
{
Packet packet;
packet.type = next_packet_type.value();
switch (next_packet_type.value())
{
case Protocol::Server::Data:
{
if (state.block)
{
packet.block = std::move(*state.block);
state.block.reset();
}
break;
}
case Protocol::Server::Progress:
{
packet.progress = std::move(state.progress);
state.progress.reset();
break;
}
case Protocol::Server::EndOfStream:
{
finishQuery();
break;
}
default:
throw Exception("Unknown packet " + toString(packet.type)
+ " from server " + getDescription(), ErrorCodes::UNKNOWN_PACKET_FROM_SERVER);
}
return packet;
}
bool LocalConnection::hasReadPendingData() const
{
return !state.is_finished;
}
std::optional<UInt64> LocalConnection::checkPacket(size_t)
{
return next_packet_type;
}
void LocalConnection::updateProgress(const Progress & value)
{
state.progress.incrementPiecewiseAtomically(value);
}
}

160
src/Client/LocalConnection.h Normal file
View File

@ -0,0 +1,160 @@
#include "Connection.h"
#include <Interpreters/Context.h>
#include <DataStreams/BlockIO.h>
#include <DataStreams/AsynchronousBlockInputStream.h>
#include <Processors/Executors/PullingAsyncPipelineExecutor.h>
#include <IO/TimeoutSetter.h>
namespace DB
{
/// State of query processing.
struct LocalQueryState
{
/// Identifier of the query.
String query_id;
QueryProcessingStage::Enum stage = QueryProcessingStage::Complete;
/// A queue with internal logs that will be passed to client. It must be
/// destroyed after input/output blocks, because they may contain other
/// threads that use this queue.
InternalTextLogsQueuePtr logs_queue;
BlockOutputStreamPtr logs_block_out;
/// Query text.
String query;
/// Streams of blocks, that are processing the query.
BlockIO io;
/// Current stream to pull blocks from.
std::unique_ptr<AsynchronousBlockInputStream> async_in;
std::unique_ptr<PullingAsyncPipelineExecutor> executor;
/// Last polled block.
std::optional<Block> block;
/// Is request cancelled
bool is_cancelled = false;
/// Is query finished == !has_pending_data
bool is_finished = false;
/// empty or not
bool is_empty = true;
/// Data was sent.
bool sent_all_data = false;
/// Request requires data from the client (INSERT, but not INSERT SELECT).
bool need_receive_data_for_insert = false;
/// Temporary tables read
bool temporary_tables_read = false;
/// A state got uuids to exclude from a query
bool part_uuids = false;
/// Request requires data from client for function input()
bool need_receive_data_for_input = false;
/// temporary place for incoming data block for input()
Block block_for_input;
/// sample block from StorageInput
Block input_header;
/// To output progress, the difference after the previous sending of progress.
Progress progress;
/// Timeouts setter for current query
std::unique_ptr<TimeoutSetter> timeout_setter;
};
class LocalConnection : public IServerConnection, WithContext
{
public:
explicit LocalConnection(ContextPtr context_);
void setDefaultDatabase(const String & database) override;
void getServerVersion(const ConnectionTimeouts & timeouts,
String & name,
UInt64 & version_major,
UInt64 & version_minor,
UInt64 & version_patch,
UInt64 & revision) override;
UInt64 getServerRevision(const ConnectionTimeouts & timeouts) override;
const String & getServerTimezone(const ConnectionTimeouts & timeouts) override;
const String & getServerDisplayName(const ConnectionTimeouts & timeouts) override;
const String & getDescription() const override;
void sendQuery(
const ConnectionTimeouts & timeouts,
const String & query,
const String & query_id_ /* = "" */,
UInt64 stage/* = QueryProcessingStage::Complete */,
const Settings * settings /* = nullptr */,
const ClientInfo * client_info /* = nullptr */,
bool with_pending_data /* = false */) override;
void sendCancel() override;
void sendData(const Block &, const String &, bool) override {}
void sendExternalTablesData(ExternalTablesData &) override {}
bool poll(size_t timeout_microseconds) override;
bool hasReadPendingData() const override;
std::optional<UInt64> checkPacket(size_t timeout_microseconds) override;
Packet receivePacket() override;
void forceConnected(const ConnectionTimeouts &) override {}
bool isConnected() const override { return true; }
bool checkConnected() override { return true; }
void disconnect() override {}
void setThrottler(const ThrottlerPtr &) override {}
private:
ContextMutablePtr query_context;
String description;
String server_name;
UInt64 server_version_major = 0;
UInt64 server_version_minor = 0;
UInt64 server_version_patch = 0;
UInt64 server_revision = 0;
String server_timezone;
String server_display_name;
String default_database;
/// At the moment, only one ongoing query in the connection is supported at a time.
LocalQueryState state;
/// Last "server" packet.
std::optional<UInt64> next_packet_type;
/// Time after the last check to stop the request and send the progress.
Stopwatch after_check_cancelled;
Stopwatch after_send_progress;
void initBlockInput();
void processOrdinaryQuery();
void processOrdinaryQueryWithProcessors();
void updateState();
Block pullBlock();
void finishQuery();
void updateProgress(const Progress & value);
};
}

2
src/Client/Suggest.cpp
View File

@ -197,7 +197,7 @@ void Suggest::loadImpl(Connection & connection, const ConnectionTimeouts & timeo
void Suggest::fetch(Connection & connection, const ConnectionTimeouts & timeouts, const std::string & query)
{
connection.sendQuery(timeouts, query, "" /* query_id */, QueryProcessingStage::Complete);
connection.sendQuery(timeouts, query, "" /* query_id */, QueryProcessingStage::Complete, nullptr, nullptr, false);
while (true)
{

8
src/DataStreams/RemoteBlockOutputStream.cpp
View File

@ -36,7 +36,7 @@ RemoteBlockOutputStream::RemoteBlockOutputStream(Connection & connection_,
/** Send query and receive "header", that describes table structure.
* Header is needed to know, what structure is required for blocks to be passed to 'write' method.
*/
connection.sendQuery(timeouts, query, "", QueryProcessingStage::Complete, &settings_, &modified_client_info);
connection.sendQuery(timeouts, query, "", QueryProcessingStage::Complete, &settings_, &modified_client_info, false);
while (true)
{
@ -77,12 +77,12 @@ void RemoteBlockOutputStream::write(const Block & block)
try
{
connection.sendData(block);
connection.sendData(block, /* name */"", /* scalar */false);
}
catch (const NetException &)
{
/// Try to get more detailed exception from server
auto packet_type = connection.checkPacket();
auto packet_type = connection.checkPacket(/* timeout_microseconds */0);
if (packet_type && *packet_type == Protocol::Server::Exception)
{
Packet packet = connection.receivePacket();
@ -104,7 +104,7 @@ void RemoteBlockOutputStream::writePrepared(ReadBuffer & input, size_t size)
void RemoteBlockOutputStream::writeSuffix()
{
/// Empty block means end of data.
connection.sendData(Block());
connection.sendData(Block(), /* name */"", /* scalar */false);
/// Wait for EndOfStream or Exception packet, skip Log packets.
while (true)