在使用 pika 連接 RabbitMQ 的過程中，發現只能獲取 ready 狀態的消息數量，只要用 http 請求來實現目的。

#encoding: utf-8
#author: walker
#date: 2018-03-06
#summary: 獲取 RabbitMQ 中3種狀態消息的數量

import os, sys, time
import requests
import json

class RabbitMQTool(object):
	def __init__(self, host, vhost, queue, user, passwd):
		self.host = host
		self.vhost = vhost
		self.queue = queue
		self.user = user
		self.passwd = passwd

	# 返回3種消息數量：ready, unacked, total
	def getMessageCount(self):
		url = 'http://%s:15672/api/queues/%s/%s' % (self.host, self.vhost, self.queue)
		r = requests.get(url, auth=(self.user, self.passwd))
		print(r)
		if r.status_code != 200:
			return -1

		dic = json.loads(r.text)
		
		return dic['messages_ready'], dic['messages_unacknowledged'], dic['messages']

if __name__ == '__main__':    
	mqTool = RabbitMQTool(host = '192.168.0.xx',
							vhost = 'vhost_walker',
							queue = 'queue_walker',
							user = 'walker',
							passwd = 'walker')

	ready, unacked, total = mqTool.getMessageCount()
	
	print('ready: %d' % ready)
	print('unacked: %d' % unacked)    
	print('total: %d' % total)

*** walker ***

通過 http 方式獲取 RabbitMQ 隊列消息數量（python3）