Question

我正在尝试从Java安排Celery任务。

我正在向RabbitMQ发送任务：

ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
connection = factory.newConnection();
channel = connection.createChannel();

boolean durable = true;
channel.queueDeclarePassive("celery");
channel.exchangeDeclarePassive("celery");

String MESSAGE_FORMAT = "{\"id\": \"%s\", " + "\"task\": \"%s\", " + "\"args\": [\"%s\"]}";
message = String.format(MESSAGE_FORMAT, UUID.randomUUID().toString(), "celery.tasks.add", "2501");
channel.basicPublish("celery", "celery", null, message.getBytes("UTF-8"));

发送消息：

| routing_key | exchange | message_count |                                                  payload                                                  | payload_bytes | payload_encoding | properties | redelivered |
+-------------+----------+---------------+-----------------------------------------------------------------------------------------------------------+---------------+------------------+------------+-------------+
| celery      |          | 0             | {"id": "7421864e-aff3-4f2f-b274-9d5eacfc8941", "task": "celery.tasks.add", "args": ["2501"]} | 105           | string           |            | False

但是当我开始工作时：

celery -A tasks worker --loglevel=info

我收到一条消息：

[2016-03-02 16:23:08,457: WARNING/MainProcess] Received and deleted unknown message. Wrong destination?!?

The full contents of the message body was: body: '{"id": "76e0fc3b-3ae0-4603-9099-3cd6bb15ffa9", "task": "celery.tasks.add", "args": ["2501"]}' (105b)
{content_type:None content_encoding:None
  delivery_info:{'redelivered': False, 'delivery_tag': 2, 'routing_key': 'celery', 'exchange': '', 'consumer_tag': 'None4'} headers={}}

所以任务没有运行，因为格式有点不对。我跟着： http://docs.celeryproject.org/en/latest/internals/protocol.html

任务在tasks.py中声明如下：

from celery import Celery

app = Celery('tasks')
app.config_from_object('celeryconfig')


@app.task
def add(materialId):
    f = open('logg','w')
    f.write('processing task: ' + materialId)
    f.close()

所以我不确定应该纠正什么。你能帮帮我吗？

如果不可能，我会回到调用python 从java进程但这会使部署过程复杂化所以我想避免它。

修改

为了测试我的方法，我尝试从python中以这种方式安排任务，但错误是相同的：

import pika

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.queue_declare(queue='celery', durable=True)
channel.basic_publish(exchange='celery', routing_key='celery', body='{"id": "7421864e-aff3-4f2f-b274-9d5eacfc8941", "task": "celery.tasks.add", "args": ["2501"]}')

EDIT2 ：

这不是Interoperating with Django/Celery From Java的副本因为答案并没有解决我的问题：调整路由密钥和交换并没有解决问题。

Answer 1

您需要使用BasicProperties构建器将消息的内容类型指定为JSON。

channel.basicPublish("celery", "celery", null, 
    new AMQP.BasicProperties().builder().contentType("application/json").build(),
    message.getBytes("UTF-8"));

如何在Rabbit的文档中使用它和更多示例：https://www.rabbitmq.com/api-guide.html#publishing

对于celery支持的内容类型标题格式：http://docs.celeryproject.org/en/latest/internals/protocol.html#serialization

Answer 2

您将需要获取从python客户端代码发送的原始任务请求，并将其与您在Java中生成的内容进行比较。

Answer 3

或者，您可以尝试使用芹菜源中this._pressData(theRow) { this.setState({test: theRow}); console.log(this.state.test); }目录中的HTTP gateway提交任务 - 我不确定如何维护代码的这一特定部分。

从Java调度Celery任务：“收到并删除未知消息。目的地错误”

3 个答案: