nsq消息队列用的公司多吗

NSQ(Named Squared Rabbit)是一个开源的分布式消息队列系统，它采用了发布/订阅模式，让多个应用程序可以相互通信，本文将详细介绍如何分析NSQ消息队列，包括安装、配置、使用和性能分析等方面。

一、安装与配置

1. 下载NSQ源码

我们需要从GitHub上下载NSQ的源码：-io/nsq

2. 编译安装

进入到源码目录，执行以下命令进行编译安装：

make install

3. 配置NSQD

安装完成后，我们需要对NSQD进行配置，在配置文件`etc/nsq/nsq.conf`中，我们可以设置以下参数：

- `listeners`:指定NSQD监听的地址和端口，格式为`[address]:[port]`,多个地址用逗号分隔。

- `lookupd_http_address`:指定lookupd的HTTP地址。

- `max_in_flight_messages`:指定每个NSQD允许的最大未确认消息数。

- `max_pub_msg_size`:指定单个发布消息的最大大小。

- `max_chan_msg_size`:指定单个频道消息的最大大小。

- `log_level`:指定日志级别。

我们可以在`listeners`中设置NSQD监听本地地址127.0.0.1的4150端口：

listeners = ["127.0.0.1:4150"]

二、使用NSQ

1. 发布消息

我们可以使用`nsqadmin`工具或者编写代码来发布消息，下面是一个使用Python发布的示例：

import nsqadmin
import uuid

def publish_message():
    nsq = nsqadmin.Reader()
    topic = "test_topic"
    message = "Hello, NSQ!" + str(uuid.uuid4())
    nsq.publish(topic, message)
    nsq.close()

2. 订阅消息

我们可以使用`nsqadmin`工具或者编写代码来订阅消息，下面是一个使用Python订阅消息的示例：

```python

import nsqadmin

import sys

import json

from nsq import Reader, MessageHandler, connection

from twisted.internet import reactor, protocol, defer, endpoints, tasklet, timeout

from twisted.internet.error import ConnectionDone, ConnectionRefusedError, TCPTimedOutError, TCPClientTransportError, TCPServerFactory, ClientConnectionFailedError, ConnectionResetError, ProtocolDisconnected, ConnectionLost, ReactorNotRestartable, TimeoutError, OSError as EOSError, error as EError, Failure as EFailure, StopIteration as EStopIteration, CancelledError as ECancelledError, Exception as EException, SystemExit as ESystemExit, _reactor as RxLoopbackGen, _ssl as SSLContextType, _interfaces as Interfaces, _tls as TlsCtxFactory, _socket as SockCtxFactory, _logging as LogLevels, _utils as Utils, _protocol as ProtocolTypes, _codec as Codecs, _message as MessageTypes, _constants as Constants, _config as ConfigManager, _options as OptionsManager, _transport as TransportTypes, _queue as QueueTypes, _topic as TopicTypes, _consumer as ConsumerTypes, _producer as ProducerTypes, _metrics as MetricsManager, _statsd as StatsdClientManager, _pubsub as PubSubClientManager, _util as UtilManager, _parser as ParserManager, _encoder as EncoderManager, _decoder as DecoderManager, _random as RandomGen

from twisted.internet.task import LoopingCall

from twisted.internet.threads import deferToThreadPoolExecutorFromThreadPool

from zope.interface import implementer

from zope.interface import provider

from zope.interface import validateNotImplementedException

from zope.interface import verifyObjectIsInitialized

from zope.interface import verifyValidImplementationsForInterface

from zope.interface import classImplementerFromSpec

from zope.interface import classImplementerByPrefixPatternDictLookupStrategyForInstancesOfClassBasedMultiImplementationMixIn649668696669387969666938796966693879696669387969666938796966693879696669387969666938796966693879696669387969666938796966693879696669387969653020150201502015020150201502015020150201502015020150201502015020150201502015020150201502015020150201502015020150201502015020150201502015020150201502E' # noqa: E501 is not a valid IP literal in Python 3 and may cause issues later on when parsing the IP address from the message ID in the topic header (see -io/nsq/issues/474 for more details)."${topic}.message") + "

", flags=methodcaller.USE_FUTURE)

nsq.run()

nsqadmin = nsqadmin.Reader()

topic = "test_topic"

message = nsqadmin.get_message(topic)["body"].decode("utf-8") # noqa: E501Easier to use string here than to try to parse the bytes back into a string with decode(). This will also work if you are using a JSON library that can automatically parse the byte data into a string (like ujson or simplejson)."${topic}.message") + "

", flags=methodcaller.USE_FUTURE) # noqa: E501This is just an example of how to publish and subscribe messages using the command line tool. You can also use the `nsqadmin` Python library to do this programmatically. For more information on how to use the command line tool and the Python library see the official documentation at -streaming-server/current/index.html#the-command-line-tool and -io/nsq#readme respectively.