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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
"""An example Flight CLI client."""
import argparse
import sys
import pyarrow
import pyarrow.flight
import pyarrow.csv as csv
def list_flights(args, client, connection_args={}):
print('Flights\n=======')
for flight in client.list_flights():
descriptor = flight.descriptor
if descriptor.descriptor_type == pyarrow.flight.DescriptorType.PATH:
print("Path:", descriptor.path)
elif descriptor.descriptor_type == pyarrow.flight.DescriptorType.CMD:
print("Command:", descriptor.command)
else:
print("Unknown descriptor type")
print("Total records:", end=" ")
if flight.total_records >= 0:
print(flight.total_records)
else:
print("Unknown")
print("Total bytes:", end=" ")
if flight.total_bytes >= 0:
print(flight.total_bytes)
else:
print("Unknown")
print("Number of endpoints:", len(flight.endpoints))
print("Schema:")
print(flight.schema)
print('---')
print('\nActions\n=======')
for action in client.list_actions():
print("Type:", action.type)
print("Description:", action.description)
print('---')
def do_action(args, client, connection_args={}):
try:
buf = pyarrow.allocate_buffer(0)
action = pyarrow.flight.Action(args.action_type, buf)
print('Running action', args.action_type)
for result in client.do_action(action):
print("Got result", result.body.to_pybytes())
except pyarrow.lib.ArrowIOError as e:
print("Error calling action:", e)
def push_data(args, client, connection_args={}):
print('File Name:', args.file)
my_table = csv.read_csv(args.file)
print('Table rows=', str(len(my_table)))
df = my_table.to_pandas()
print(df.head())
writer, _ = client.do_put(
pyarrow.flight.FlightDescriptor.for_path(args.file), my_table.schema)
writer.write_table(my_table)
writer.close()
def get_flight(args, client, connection_args={}):
if args.path:
descriptor = pyarrow.flight.FlightDescriptor.for_path(*args.path)
else:
descriptor = pyarrow.flight.FlightDescriptor.for_command(args.command)
info = client.get_flight_info(descriptor)
for endpoint in info.endpoints:
print('Ticket:', endpoint.ticket)
for location in endpoint.locations:
print(location)
get_client = pyarrow.flight.FlightClient(location,
**connection_args)
reader = get_client.do_get(endpoint.ticket)
df = reader.read_pandas()
print(df)
def _add_common_arguments(parser):
parser.add_argument('--tls', action='store_true',
help='Enable transport-level security')
parser.add_argument('--tls-roots', default=None,
help='Path to trusted TLS certificate(s)')
parser.add_argument("--mtls", nargs=2, default=None,
metavar=('CERTFILE', 'KEYFILE'),
help="Enable transport-level security")
parser.add_argument('host', type=str,
help="Address or hostname to connect to")
def main():
parser = argparse.ArgumentParser()
subcommands = parser.add_subparsers()
cmd_list = subcommands.add_parser('list')
cmd_list.set_defaults(action='list')
_add_common_arguments(cmd_list)
cmd_list.add_argument('-l', '--list', action='store_true',
help="Print more details.")
cmd_do = subcommands.add_parser('do')
cmd_do.set_defaults(action='do')
_add_common_arguments(cmd_do)
cmd_do.add_argument('action_type', type=str,
help="The action type to run.")
cmd_put = subcommands.add_parser('put')
cmd_put.set_defaults(action='put')
_add_common_arguments(cmd_put)
cmd_put.add_argument('file', type=str,
help="CSV file to upload.")
cmd_get = subcommands.add_parser('get')
cmd_get.set_defaults(action='get')
_add_common_arguments(cmd_get)
cmd_get_descriptor = cmd_get.add_mutually_exclusive_group(required=True)
cmd_get_descriptor.add_argument('-p', '--path', type=str, action='append',
help="The path for the descriptor.")
cmd_get_descriptor.add_argument('-c', '--command', type=str,
help="The command for the descriptor.")
args = parser.parse_args()
if not hasattr(args, 'action'):
parser.print_help()
sys.exit(1)
commands = {
'list': list_flights,
'do': do_action,
'get': get_flight,
'put': push_data,
}
host, port = args.host.split(':')
port = int(port)
scheme = "grpc+tcp"
connection_args = {}
if args.tls:
scheme = "grpc+tls"
if args.tls_roots:
with open(args.tls_roots, "rb") as root_certs:
connection_args["tls_root_certs"] = root_certs.read()
if args.mtls:
with open(args.mtls[0], "rb") as cert_file:
tls_cert_chain = cert_file.read()
with open(args.mtls[1], "rb") as key_file:
tls_private_key = key_file.read()
connection_args["cert_chain"] = tls_cert_chain
connection_args["private_key"] = tls_private_key
client = pyarrow.flight.FlightClient(f"{scheme}://{host}:{port}",
**connection_args)
while True:
try:
action = pyarrow.flight.Action("healthcheck", b"")
options = pyarrow.flight.FlightCallOptions(timeout=1)
list(client.do_action(action, options=options))
break
except pyarrow.ArrowIOError as e:
if "Deadline" in str(e):
print("Server is not ready, waiting...")
commands[args.action](args, client, connection_args)
if __name__ == '__main__':
main()
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