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# A OpenTraced client for a Python service that implements the store interface.
from __future__ import print_function
import time
import argparse
from builtins import input, range
import grpc
from jaeger_client import Config
from grpc_opentracing import open_tracing_client_interceptor, \
SpanDecorator
from grpc_opentracing.grpcext import intercept_channel
import store_pb2
class CommandExecuter(object):
def __init__(self, stub):
self._stub = stub
def _execute_rpc(self, method, via, timeout, request_or_iterator):
if via == 'future':
result = getattr(self._stub, method).future(request_or_iterator,
timeout)
return result.result()
elif via == 'with_call':
return getattr(self._stub, method).with_call(request_or_iterator,
timeout)[0]
else:
return getattr(self._stub, method)(request_or_iterator, timeout)
def do_stock_item(self, via, timeout, arguments):
if len(arguments) != 1:
print('must input a single item')
return
request = store_pb2.AddItemRequest(name=arguments[0])
self._execute_rpc('AddItem', via, timeout, request)
def do_stock_items(self, via, timeout, arguments):
if not arguments:
print('must input at least one item')
return
requests = [store_pb2.AddItemRequest(name=name) for name in arguments]
self._execute_rpc('AddItems', via, timeout, iter(requests))
def do_sell_item(self, via, timeout, arguments):
if len(arguments) != 1:
print('must input a single item')
return
request = store_pb2.RemoveItemRequest(name=arguments[0])
response = self._execute_rpc('RemoveItem', via, timeout, request)
if not response.was_successful:
print('unable to sell')
def do_sell_items(self, via, timeout, arguments):
if not arguments:
print('must input at least one item')
return
requests = [
store_pb2.RemoveItemRequest(name=name) for name in arguments
]
response = self._execute_rpc('RemoveItems', via, timeout,
iter(requests))
if not response.was_successful:
print('unable to sell')
def do_inventory(self, via, timeout, arguments):
if arguments:
print('inventory does not take any arguments')
return
if via != 'functor':
print('inventory can only be called via functor')
return
request = store_pb2.Empty()
result = self._execute_rpc('ListInventory', via, timeout, request)
for query in result:
print(query.name, '\t', query.count)
def do_query_item(self, via, timeout, arguments):
if len(arguments) != 1:
print('must input a single item')
return
request = store_pb2.QueryItemRequest(name=arguments[0])
query = self._execute_rpc('QueryQuantity', via, timeout, request)
print(query.name, '\t', query.count)
def do_query_items(self, via, timeout, arguments):
if not arguments:
print('must input at least one item')
return
if via != 'functor':
print('query_items can only be called via functor')
return
requests = [store_pb2.QueryItemRequest(name=name) for name in arguments]
result = self._execute_rpc('QueryQuantities', via, timeout,
iter(requests))
for query in result:
print(query.name, '\t', query.count)
def execute_command(command_executer, command, arguments):
via = 'functor'
timeout = None
for argument_index in range(0, len(arguments), 2):
argument = arguments[argument_index]
if argument == '--via' and argument_index + 1 < len(arguments):
if via not in ('functor', 'with_call', 'future'):
print('invalid --via option')
return
via = arguments[argument_index + 1]
elif argument == '--timeout' and argument_index + 1 < len(arguments):
timeout = float(arguments[argument_index + 1])
else:
arguments = arguments[argument_index:]
break
try:
getattr(command_executer, 'do_' + command)(via, timeout, arguments)
except AttributeError:
print('unknown command: \"%s\"' % command)
INSTRUCTIONS = \
"""Enter commands to interact with the store service:
stock_item Stock a single item.
stock_items Stock one or more items.
sell_item Sell a single item.
sell_items Sell one or more items.
inventory List the store's inventory.
query_item Query the inventory for a single item.
query_items Query the inventory for one or more items.
You can also optionally provide a --via argument to instruct the RPC to be
initiated via either the functor, with_call, or future method; or provide a
--timeout argument to set a deadline for the RPC to be completed.
Example:
> stock_item apple
> stock_items --via future apple milk
> inventory
apple 2
milk 1
"""
def read_and_execute(command_executer):
print(INSTRUCTIONS)
while True:
try:
line = input('> ')
components = line.split()
if not components:
continue
command = components[0]
arguments = components[1:]
execute_command(command_executer, command, arguments)
except EOFError:
break
class StoreSpanDecorator(SpanDecorator):
def __call__(self, span, rpc_info):
span.set_tag('grpc.method', rpc_info.full_method)
span.set_tag('grpc.headers', str(rpc_info.metadata))
span.set_tag('grpc.deadline', str(rpc_info.timeout))
def run():
parser = argparse.ArgumentParser()
parser.add_argument(
'--log_payloads',
action='store_true',
help='log request/response objects to open-tracing spans')
parser.add_argument(
'--include_grpc_tags',
action='store_true',
help='set gRPC-specific tags on spans')
args = parser.parse_args()
config = Config(
config={
'sampler': {
'type': 'const',
'param': 1,
},
'logging': True,
},
service_name='store-client')
tracer = config.initialize_tracer()
span_decorator = None
if args.include_grpc_tags:
span_decorator = StoreSpanDecorator()
tracer_interceptor = open_tracing_client_interceptor(
tracer, log_payloads=args.log_payloads, span_decorator=span_decorator)
channel = grpc.insecure_channel('localhost:50051')
channel = intercept_channel(channel, tracer_interceptor)
stub = store_pb2.StoreStub(channel)
read_and_execute(CommandExecuter(stub))
time.sleep(2)
tracer.close()
time.sleep(2)
if __name__ == '__main__':
run()
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