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我在 Context Broker 上有一个具有多个属性（例如温度、湿度等）的实体。我有一个 MySql 数据库，它按行保存该实体的值。因此，为了保留该信息，我必须从 cygnus 订阅。这里的问题是信息正在被保留，但是当我运行命令时，(curl http://localhost:1026/v2/subscription)我得到输出：[]好像正在进行任何订阅。如果我执行命令echo 'db.csubs.count()' | mongo orion --quiet，它甚至会显示输出 0。

运行操作系统：Centos 6 我的 Orion 上下文代理版本：0.26.0

Orion 作为服务运行：

/usr/bin/contextBroker -port 1026 -logDir /var/log/contextBroker -pidpath /var/run/contextBroker/contextBroker.pid -dbhost localhost -db orion -multiservice

所以从第一步开始。假设我没有对数据库进行任何订阅。我运行命令：

/usr/cygnus/bin/cygnus-flume-ng agent --conf /usr/cygnus/conf/ -f /usr/cygnus/conf/agent_a1.conf -n cygnusagent -Dflume.root.logger=INFO,console

以确保水槽代理正在运行。

python2.7 SetSubscription.py bus temperature http://188.???.??.???:5050/notify

python 脚本是 github 存储库中提供的 fiware-figway 文件夹中提供的脚本。 

import requests, json, re
from collections import Counter
import ConfigParser
import io
import sys

CONFIG_FILE = "../config.ini"

NUM_ARG=len(sys.argv)
COMMAND=sys.argv[0]

if NUM_ARG==4:
   ENTITY_ID=sys.argv[1]
   ENTITY_ATTR=sys.argv[2]
   SERVER_URL=sys.argv[3]
else:
   print 'Usage: '+COMMAND+' [ENTITY ID] [ATTRIBUTE] [SERVER URL]'
   print '  ENTITY ID = Entity you want to watch for changes/updates.'
   print '  ATTRIBUTE = Attribute whose change will trigger notifications. In this example script only this attribute will be notified.'
   print '  SERVER URL = (Local) Server listening for notifications.Example: http://myserver.domain.com:10000'
   print '    It has to be a reachable address:port for the ContextBroker. If you are behind a NAT/Firewall contact your network admin.'
   print
   sys.exit(2)


# Load the configuration file
with open(CONFIG_FILE,'r+') as f:
    sample_config = f.read()
config = ConfigParser.RawConfigParser(allow_no_value=True)
config.readfp(io.BytesIO(sample_config))

CB_HOST=config.get('contextbroker', 'host')
CB_PORT=config.get('contextbroker', 'port')
CB_FIWARE_SERVICE=config.get('contextbroker', 'fiware_service')
CB_AAA=config.get('contextbroker', 'OAuth')
if CB_AAA == "yes":
   TOKEN=config.get('user', 'token')
   TOKEN_SHOW=TOKEN[1:5]+"**********************************************************************"+TOKEN[-5:]
else:
   TOKEN="NULL"
   TOKEN_SHOW="NULL"

NODE_ID=config.get('local', 'host_id')
f.close()

CB_URL = "http://"+CB_HOST+":"+CB_PORT
MIN_INTERVAL = "PT5S"
DURATION = "P1M"
ENTITY_TYPE = ""
ENTITY_ATTR_WATCH = ENTITY_ATTR
ENTITY_ATTR_NOTIFY = ENTITY_ATTR

PAYLOAD = '{ \
    "entities": [ \
        { \
            "type": "'+ENTITY_TYPE+'", \
            "isPattern": "false", \
            "id": "'+ENTITY_ID+'" \
        } \
    ], \
    "attributes": [ \
        "'+ENTITY_ATTR_NOTIFY+'" \
    ], \
    "reference": "'+SERVER_URL+'", \
    "duration": "'+DURATION+'", \
    "notifyConditions": [ \
        { \
            "type": "ONCHANGE", \
            "condValues": [ \
                "'+ENTITY_ATTR_WATCH+'" \
            ] \
        } \
    ], \
    "throttling": "'+MIN_INTERVAL+'" \
}'

HEADERS = {'content-type': 'application/json', 'accept': 'application/json' , 'Fiware-Service': CB_FIWARE_SERVICE ,'X-Auth-Token' : TOKEN}
#HEADERS = {'content-type': 'application/json', 'Fiware-Service': CB_FIWARE_SERVICE ,'X-Auth-Token' : TOKEN}
HEADERS_SHOW = {'content-type': 'application/json', 'accept': 'application/json' , 'Fiware-Service': CB_FIWARE_SERVICE , 'X-Auth-Token' : TOKEN_SHOW}
URL = CB_URL + '/v1/subscribeContext'

print "* Asking to "+URL
print "* Headers: "+str(HEADERS_SHOW)
print "* Sending PAYLOAD: "
print json.dumps(json.loads(PAYLOAD), indent=4)
print
print "..."
r = requests.post(URL, data=PAYLOAD, headers=HEADERS)
print
print "* Status Code: "+str(r.status_code)
print
print r.text

现在每次我对值进行更改时，值都会更改并保存在数据库中。

如果您需要更多信息，请随时询问！

编辑：

有效载荷“请求”、“标头：”和“发送有效载荷”：

* Asking to http://188.???.??.???:1026/v1/subscribeContext
* Headers: {'Fiware-Service': 'fiwarefinal', 'content-type': 'application/json', 'accept': 'application/json', 'X-Auth-Token': 'NULL'}
* Sending PAYLOAD:
{
    "reference": "http://localhost:5050/notify",
    "throttling": "PT5S",
    "entities": [
        {
            "type": "",
            "id": "bus1",
            "isPattern": "false"
        }
    ],
    "attributes": [
        "temperature"
    ],
    "duration": "P1M",
    "notifyConditions": [
        {
            "condValues": [
                "temperature"
            ],
            "type": "ONCHANGE"
        }
    ]
}

...

* Status Code: 200

{
  "subscribeResponse" : {
    "subscriptionId" : "56781c2d071f621a6546e740",
    "duration" : "P1M",
    "throttling" : "PT5S"
  }
}
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1 回答 1

1

请注意，您在多服务模式下运行 Orion。因此，实体/属性/订阅由完全隔离在MongoDB层不同数据库中的tentant/services分隔。特别注意，订阅上下文请求正在使用Fiware-Service: fiwarefinal，因此订阅是在“fiwarefinal”服务（与orion-fiwarefinal数据库关联）​​中创建的。

因此curl http://localhost:1026/v2/subscription不会显示任何订阅，因为订阅查询已在默认租户（与orion数据库关联）​​中解析。对于echo 'db.csubs.count()' | mongo orion --quiet. 为了获得“fiwarefinal”服务的订阅列表（或在数据库中计数），您应该使用：

  • curl --header 'Fiware-Service: fiwarefinal' http://localhost:1026/v2/subscription
  • echo 'db.csubs.count()' | mongo orion-fiwarefinal --quiet

Fiware-Service: fiwarefinal请注意，如果要在“fiwarefinal”租户/服务中删除订阅，还需要在取消订阅上下文操作中使用。

请查找有关多服务模式及其 与 DB 级别的关系的更多信息。

于 2015-12-21T15:57:06.430 回答