mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-10 09:32:06 +00:00
306 lines
13 KiB
Python
Executable File
306 lines
13 KiB
Python
Executable File
#!/usr/bin/env python3
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# This utility provides similar interface to clickhouse-client.
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# This utility also can work in two modes: interactive and non-interactive (batch).
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#
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# For example,
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# ./clickhouse_grpc_client.py - runs interactive mode; and
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# ./clickhouse_grpc_client.py -u John -q "SELECT * FROM mytable" - runs only a specified query from the user John.
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#
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# Most of the command line options are the same, for more information type
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# ./clickhouse_grpc_client.py --help
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import grpc # pip3 install grpcio
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import grpc_tools # pip3 install grpcio-tools
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import argparse, cmd, os, signal, subprocess, sys, threading, time, uuid
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DEFAULT_HOST = 'localhost'
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DEFAULT_PORT = 9100
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DEFAULT_USER_NAME = 'default'
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DEFAULT_OUTPUT_FORMAT_FOR_INTERACTIVE_MODE = 'PrettyCompact'
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HISTORY_FILENAME = '~/.clickhouse_grpc_history'
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HISTORY_SIZE = 1000
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STDIN_BUFFER_SIZE = 1048576
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DEFAULT_ENCODING = 'utf-8'
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class ClickHouseGRPCError(Exception):
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pass
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# Temporary override reaction on Ctrl+C.
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class KeyboardInterruptHandlerOverride:
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# If `handler` return True that means pressing Ctrl+C has been handled, no need to call previous handler.
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def __init__(self, handler):
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self.handler = handler
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def __enter__(self):
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self.previous_handler = signal.signal(signal.SIGINT, self.__handler)
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def __exit__(self, exc_type, exc_value, traceback):
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signal.signal(signal.SIGINT, self.previous_handler)
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def __handler(self, signum, frame):
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if not self.handler():
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self.previous_handler(signum, frame)
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# Print to stderr
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def error_print(*args, **kwargs):
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print(*args, file=sys.stderr, **kwargs)
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class ClickHouseGRPCClient(cmd.Cmd):
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prompt="grpc :) "
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def __init__(self, host=DEFAULT_HOST, port=DEFAULT_PORT, user_name=DEFAULT_USER_NAME, password='',
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database='', output_format='', settings='', verbatim=False, show_debug_info=False):
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super(ClickHouseGRPCClient, self).__init__(completekey=None)
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self.host = host
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self.port = port
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self.user_name = user_name
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self.password = password
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self.database = database
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self.output_format = output_format
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self.settings = settings
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self.verbatim = verbatim
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self.show_debug_info = show_debug_info
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self.channel = None
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self.stub = None
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self.session_id = None
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def __enter__(self):
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ClickHouseGRPCClient.__generate_pb2()
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ClickHouseGRPCClient.__import_pb2()
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self.__connect()
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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self.__disconnect()
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# Executes a simple query and returns its output.
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def get_simple_query_output(self, query_text):
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result = self.stub.ExecuteQuery(clickhouse_grpc_pb2.QueryInfo(query=query_text, user_name=self.user_name, password=self.password,
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database=self.database, output_format='TabSeparated', settings=self.settings,
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session_id=self.session_id, query_id=str(uuid.uuid4())))
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if self.show_debug_info:
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print('\nresult={}'.format(result))
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ClickHouseGRPCClient.__check_no_errors(result)
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return result.output.decode(DEFAULT_ENCODING)
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# Executes a query using the stream IO and with ability to cancel it by pressing Ctrl+C.
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def run_query(self, query_text, raise_exceptions=True, allow_cancel=False):
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start_time = time.time()
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cancelled = False
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cancel_tries = 0
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cancel_event = threading.Event()
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def keyboard_interrupt_handler():
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if allow_cancel:
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nonlocal cancel_tries
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cancel_tries = cancel_tries + 1
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if cancel_tries < 3:
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self.verbatim_print("Cancelling query.")
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if cancel_tries == 1:
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cancel_event.set()
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return True
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# third attempt to cancel - we use previous handler which will terminate the client.
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self.verbatim_print("Couldn't cancel the query, terminating.")
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return False
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with KeyboardInterruptHandlerOverride(keyboard_interrupt_handler):
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try:
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def send_query_info():
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# send main query info
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info = clickhouse_grpc_pb2.QueryInfo(query=query_text, user_name=self.user_name, password=self.password,
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database=self.database, output_format=self.output_format, settings=self.settings,
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session_id=self.session_id, query_id=str(uuid.uuid4()))
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# send input data
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if not sys.stdin.isatty():
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while True:
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info.input_data = sys.stdin.buffer.read(STDIN_BUFFER_SIZE)
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if not info.input_data:
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break
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info.next_query_info = True
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yield info
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info = clickhouse_grpc_pb2.QueryInfo()
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yield info
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# wait for possible cancel
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if allow_cancel:
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cancel_event.wait()
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if cancel_tries > 0:
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yield clickhouse_grpc_pb2.QueryInfo(cancel=True)
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for result in self.stub.ExecuteQueryWithStreamIO(send_query_info()):
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if self.show_debug_info:
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print('\nresult={}'.format(result))
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ClickHouseGRPCClient.__check_no_errors(result)
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sys.stdout.buffer.write(result.output)
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sys.stdout.flush()
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if result.cancelled:
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cancelled = True
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self.verbatim_print("Query was cancelled.")
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cancel_event.set()
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if not cancelled:
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execution_time = time.time() - start_time
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self.verbatim_print('\nElapsed: {execution_time} sec.\n'.format(execution_time=execution_time))
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except Exception as e:
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if raise_exceptions:
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raise
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error_print(e)
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# Establish connection.
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def __connect(self):
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self.verbatim_print("Connecting to {host}:{port} as user {user_name}.".format(host=self.host, port=self.port, user_name=self.user_name))
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# Secure channels are supported by server but not supported by this client.
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start_time = time.time()
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self.channel = grpc.insecure_channel(self.host + ':' + str(self.port))
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connection_time = 0
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timeout=5
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while True:
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try:
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grpc.channel_ready_future(self.channel).result(timeout=timeout)
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break;
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except grpc.FutureTimeoutError:
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connection_time += timeout
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self.verbatim_print("Couldn't connect to ClickHouse server in {connection_time} seconds.".format(connection_time=connection_time))
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self.stub = clickhouse_grpc_pb2_grpc.ClickHouseStub(self.channel)
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connection_time = time.time() - start_time
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if self.verbatim:
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version = self.get_simple_query_output("SELECT version() FORMAT TabSeparated").rstrip('\n')
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self.verbatim_print("Connected to ClickHouse server version {version} via gRPC protocol in {connection_time}.".format(version=version, connection_time=connection_time))
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def __disconnect(self):
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if self.channel:
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self.channel.close()
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self.channel = None
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self.stub = None
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self.session_id = None
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@staticmethod
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def __check_no_errors(result):
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if result.HasField('exception'):
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raise ClickHouseGRPCError(result.exception.display_text)
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# Use grpcio-tools to generate *pb2.py files from *.proto.
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@staticmethod
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def __generate_pb2():
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script_dir = os.path.dirname(os.path.realpath(__file__))
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proto_dir = os.path.join(script_dir, './protos')
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gen_dir = os.path.join(script_dir, './_gen')
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if os.path.exists(os.path.join(gen_dir, 'clickhouse_grpc_pb2_grpc.py')):
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return
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os.makedirs(gen_dir, exist_ok=True)
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cmd = ['python3', '-m', 'grpc_tools.protoc', '-I'+proto_dir, '--python_out='+gen_dir, '--grpc_python_out='+gen_dir,
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proto_dir+'/clickhouse_grpc.proto']
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p = subprocess.Popen(cmd, stderr=subprocess.PIPE)
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# We don't want to show grpc_tools warnings.
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errors = p.stderr.read().decode().strip('\n').split('\n')
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only_warnings = all(('Warning' in error) for error in errors)
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if not only_warnings:
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error_print('\n'.join(errors))
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# Import the generated *pb2.py files.
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@staticmethod
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def __import_pb2():
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script_dir = os.path.dirname(os.path.realpath(__file__))
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gen_dir = os.path.join(script_dir, './_gen')
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sys.path.append(gen_dir)
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global clickhouse_grpc_pb2, clickhouse_grpc_pb2_grpc
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import clickhouse_grpc_pb2, clickhouse_grpc_pb2_grpc
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# Prints only if interactive mode is activated.
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def verbatim_print(self, *args, **kwargs):
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if self.verbatim:
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print(*args, **kwargs)
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# Overrides Cmd.preloop(). Executed once when cmdloop() is called.
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def preloop(self):
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super(ClickHouseGRPCClient, self).preloop()
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ClickHouseGRPCClient.__read_history()
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# we use session for interactive mode
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self.session_id = str(uuid.uuid4())
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# Overrides Cmd.postloop(). Executed once when cmdloop() is about to return.
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def postloop(self):
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super(ClickHouseGRPCClient, self).postloop()
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ClickHouseGRPCClient.__write_history()
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# Overrides Cmd.onecmd(). Runs single command.
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def onecmd(self, line):
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stripped = line.strip()
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if stripped == 'exit' or stripped == 'quit':
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return True
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if stripped == '':
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return False
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self.run_query(line, raise_exceptions=False, allow_cancel=True)
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return False
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# Enables history of commands for interactive mode.
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@staticmethod
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def __read_history():
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global readline
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try:
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import readline
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except ImportError:
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readline = None
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histfile = os.path.expanduser(HISTORY_FILENAME)
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if readline and os.path.exists(histfile):
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readline.read_history_file(histfile)
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@staticmethod
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def __write_history():
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global readline
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if readline:
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readline.set_history_length(HISTORY_SIZE)
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histfile = os.path.expanduser(HISTORY_FILENAME)
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readline.write_history_file(histfile)
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# MAIN
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def main(args):
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parser = argparse.ArgumentParser(description='ClickHouse client accessing server through gRPC protocol.', add_help=False)
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parser.add_argument('--help', help='Show this help message and exit', action='store_true')
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parser.add_argument('--host', '-h', help='The server name, ‘localhost’ by default. You can use either the name or the IPv4 or IPv6 address.', default='localhost')
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parser.add_argument('--port', help='The port to connect to. This port should be enabled on the ClickHouse server (see grpc_port in the config).', default=9100)
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parser.add_argument('--user', '-u', dest='user_name', help='The username. Default value: ‘default’.', default='default')
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parser.add_argument('--password', help='The password. Default value: empty string.', default='')
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parser.add_argument('--query', '-q', help='The query to process when using non-interactive mode.', default='')
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parser.add_argument('--database', '-d', help='Select the current default database. Default value: the current database from the server settings (‘default’ by default).', default='')
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parser.add_argument('--format', '-f', dest='output_format', help='Use the specified default format to output the result.', default='')
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parser.add_argument('--debug', dest='show_debug_info', help='Enables showing the debug information.', action='store_true')
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args = parser.parse_args(args)
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if args.help:
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parser.print_help()
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sys.exit(0)
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interactive_mode = not args.query
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verbatim = interactive_mode
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output_format = args.output_format
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if not output_format and interactive_mode:
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output_format = DEFAULT_OUTPUT_FORMAT_FOR_INTERACTIVE_MODE
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try:
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with ClickHouseGRPCClient(host=args.host, port=args.port, user_name=args.user_name, password=args.password,
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database=args.database, output_format=output_format, verbatim=verbatim,
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show_debug_info=args.show_debug_info) as client:
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if interactive_mode:
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client.cmdloop()
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else:
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client.run_query(args.query)
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except KeyboardInterrupt:
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pass
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except Exception as e:
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error_print(e)
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if verbatim:
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print("\nBye")
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if __name__ == '__main__':
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main(sys.argv[1:])
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