问题

有没有一个工作示例，其中我们使用Locust性能测试工具进行了grpc的双向通信？

我在网上找不到很多关于grpc与Locust特别是双向通信的工作示例。

答案1

得分: 2

Locust文档中有一个关于使用Locust的gRPC的相对详细的示例。我将重新发布可能最相关的部分，但你可能需要查看文档的其余部分。

import time
from typing import Any, Callable
import grpc
import grpc.experimental.gevent as grpc_gevent
from grpc_interceptor import ClientInterceptor
from locust import User
from locust.exception import LocustError

# 修补grpc以使用gevent而不是asyncio
grpc_gevent.init_gevent()

class LocustInterceptor(ClientInterceptor):
    def __init__(self, environment, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.env = environment

    def intercept(
        self,
        method: Callable,
        request_or_iterator: Any,
        call_details: grpc.ClientCallDetails,
    ):
        response = None
        exception = None
        start_perf_counter = time.perf_counter()
        response_length = 0
        try:
            response = method(request_or_iterator, call_details)
            response_length = response.result().ByteSize()
        except grpc.RpcError as e:
            exception = e

        self.env.events.request.fire(
            request_type="grpc",
            name=call_details.method,
            response_time=(time.perf_counter() - start_perf_counter) * 1000,
            response_length=response_length,
            response=response,
            context=None,
            exception=exception,
        )
        return response

class GrpcUser(User):
    abstract = True
    stub_class = None

    def __init__(self, environment):
        super().__init__(environment)
        for attr_value, attr_name in ((self.host, "host"), (self.stub_class, "stub_class")):
            if attr_value is None:
                raise LocustError(f"You must specify the {attr_name}.")

        self._channel = grpc.insecure_channel(self.host)
        interceptor = LocustInterceptor(environment=environment)
        self._channel = grpc.intercept_channel(self._channel, interceptor)

        self.stub = self.stub_class(self._channel)

import time
from typing import Any, Callable
import grpc
import grpc.experimental.gevent as grpc_gevent
from grpc_interceptor import ClientInterceptor
from locust import User
from locust.exception import LocustError
# patch grpc so that it uses gevent instead of asyncio
grpc_gevent.init_gevent()
class LocustInterceptor(ClientInterceptor):
def __init__(self, environment, *args, **kwargs):
super().__init__(*args, **kwargs)
self.env = environment
def intercept(
self,
method: Callable,
request_or_iterator: Any,
call_details: grpc.ClientCallDetails,
):
response = None
exception = None
start_perf_counter = time.perf_counter()
response_length = 0
try:
response = method(request_or_iterator, call_details)
response_length = response.result().ByteSize()
except grpc.RpcError as e:
exception = e
self.env.events.request.fire(
request_type="grpc",
name=call_details.method,
response_time=(time.perf_counter() - start_perf_counter) * 1000,
response_length=response_length,
response=response,
context=None,
exception=exception,
)
return response
class GrpcUser(User):
abstract = True
stub_class = None
def __init__(self, environment):
super().__init__(environment)
for attr_value, attr_name in ((self.host, "host"), (self.stub_class, "stub_class")):
if attr_value is None:
raise LocustError(f"You must specify the {attr_name}.")
self._channel = grpc.insecure_channel(self.host)
interceptor = LocustInterceptor(environment=environment)
self._channel = grpc.intercept_channel(self._channel, interceptor)
self.stub = self.stub_class(self._channel)