mirror of
https://github.com/ClickHouse/ClickHouse.git
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72 lines
2.1 KiB
Python
72 lines
2.1 KiB
Python
import errno
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import subprocess as sp
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from threading import Timer
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import tempfile
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class Client:
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def __init__(self, host, port=9000, command='/usr/bin/clickhouse-client'):
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self.host = host
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self.port = port
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self.command = [command, '--host', self.host, '--port', str(self.port)]
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def query(self, sql, stdin=None, timeout=None):
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return QueryRequest(self, sql, stdin, timeout).get_answer()
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def get_query_request(self, sql, stdin=None, timeout=None):
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return QueryRequest(self, sql, stdin, timeout)
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class QueryRequest:
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def __init__(self, client, sql, stdin=None, timeout=None):
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self.client = client
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command = self.client.command[:]
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if stdin is None:
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command += ['--multiquery']
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stdin = sql
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else:
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command += ['--query', sql]
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# Write data to tmp file to avoid PIPEs and execution blocking
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stdin_file = tempfile.TemporaryFile()
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stdin_file.write(stdin)
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stdin_file.seek(0)
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self.stdout_file = tempfile.TemporaryFile()
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self.stderr_file = tempfile.TemporaryFile()
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#print " ".join(command), "\nQuery:", sql
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self.process = sp.Popen(command, stdin=stdin_file, stdout=self.stdout_file, stderr=self.stderr_file)
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self.timer = None
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self.process_finished_before_timeout = True
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if timeout is not None:
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def kill_process():
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if self.process.poll() is None:
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self.process.kill()
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self.process_finished_before_timeout = False
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self.timer = Timer(timeout, kill_process)
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self.timer.start()
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def get_answer(self):
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self.process.wait()
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self.stdout_file.seek(0)
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self.stderr_file.seek(0)
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stdout = self.stdout_file.read()
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stderr = self.stderr_file.read()
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if self.process.returncode != 0 or stderr:
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raise Exception('Client failed! Return code: {}, stderr: {}'.format(self.process.returncode, stderr))
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if self.timer is not None and not self.process_finished_before_timeout:
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raise Exception('Client timed out!')
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return stdout
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