you are right, this was the cause. But the second problem still exists, the
output is as follows:
loading app test-xx.py
require_app: service is required by test-xx
loading app xx.service
instantiating app xx.service of Service
instantiating app test-xx.py of testxx
BRICK testxx
BRICK service
CONSUMES EventDeleteXXRequest
CONSUMES EventCreateXXRequest
EVENT testxx->service EventCreateXXRequest
...service.py prints out request...
...testxx.py prints out reply...
EVENT LOST testxx->service EventDeleteXXRequest
> On May 18, 2017, at 9:50 PM, Iwase Yusuke <[email protected]> wrote:
>
> Hi Yikai,
>
> Could you share the command you invoked?
> If "xx/service.py" is specified by handler.register_service(), you don't
> need to add it for "ryu-manager" argument, I guess.
> In that case, "xx/service.py" should be automatically detected as the
> required service.
> If specified, "xx/service.py" will be loaded doubly, then will raise
> AssertionError at "assert app.name not in SERVICE_BRICKS".
>
> # NG --> "xx/service.py" will be loaded doubly
> $ ryu-manager test-xx.py xx/service.py
>
> # OK
> $ ryu-manager test-xx.py
>
> Thanks,
> Iwase
>
>
> On 2017年05月19日 10:10, Yikai Lin wrote:
>> And regarding the first problem, my PYTHONPATH is like this /path/to/myapp
>>
>> and the service.py is at /path/to/myapp/xx/service.py
>>
>> in event.py I wrote handler.register_service(‘xx.service’)
>> in api.py I wrote app_manager.require_app(‘xx.service’, api_style=True)
>>
>> and the output was like this:
>>
>> loading app test-xx.py
>> require_app: xx.service is required by test-xx
>> *loading app xx/service.py*
>> *loading app xx.service*
>> *instantiating app xx/service.py of Service*
>> *instantiating app xx.service of Service*
>> Traceback (most recent call last):
>> File "/home/yikai/.local/bin/ryu-manager", line 11, in <module>
>> sys.exit(main())
>> File "/home/yikai/.local/lib/python2.7/site-packages/ryu/cmd/manager.py",
>> line 81, in main
>> services.extend(app_mgr.instantiate_apps(**contexts))
>> File
>> "/home/yikai/.local/lib/python2.7/site-packages/ryu/base/app_manager.py",
>> line 509, in instantiate_apps
>> self._instantiate(app_name, cls, *args, **kwargs)
>> File
>> "/home/yikai/.local/lib/python2.7/site-packages/ryu/base/app_manager.py",
>> line 496, in _instantiate
>> register_app(app)
>> File
>> "/home/yikai/.local/lib/python2.7/site-packages/ryu/base/app_manager.py",
>> line 62, in register_app
>> assert app.name not in SERVICE_BRICKS
>> AssertionError
>>
>> The bolded lines are what confuse me and where the errors come from
>>
>> Yikai
>>
>>> On May 18, 2017, at 1:03 PM, Yikai Lin <[email protected]
>>> <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>>>
>>> wrote:
>>>
>>> Hi Iwase,
>>>
>>> I did actually enable --verbose and saw that the service was loaded, and I
>>> was able to see the first request processed. The second request however was
>>> lost.
>>>
>>> The test app looks something like this:
>>>
>>> from xxx import api
>>>
>>> def __init__(...):
>>> hub.spawn(_test)
>>>
>>> def _test(...):
>>> rep = api.getsomething(a,b)
>>> print(rep) # success
>>> rep = api.getsomethingelse(a,b)
>>> print(rep) # failure
>>>
>>>
>>> On Wed, May 17, 2017 at 9:13 PM Iwase Yusuke <[email protected]
>>> <mailto:[email protected]> <mailto:[email protected]
>>> <mailto:[email protected]>>> wrote:
>>>
>>> Hi Yikai,
>>>
>>> Sorry if I couldn't understand your question well.
>>>
>>>
>>> On 2017年05月17日 15:20, Yikai Lin wrote:
>>>> The first problem was somehow fixed by removing xxx from that line of
>>>> code, so it goes handler.register_service('service)', which is weird. But
>>>> the second problem was not resolved.
>>>
>>> The arguments of handler.register_service() is the string which is the
>>> "Python module path"
>>> from your current "sys.path".
>>> For example, if you set PYTHONPATH=/path/to/yourapp and service is
>>> placed at
>>> /path/to/yourapp/service.py, you need to specify just "service" to
>>> register_service.
>>>
>>> For the second problem, if you got "EVENT LOST", this messages shows
>>> your application or
>>> service were not loaded as expected.
>>> Please confirm the dump of services at starting of ryu-manager with
>>> "--verbose" option.
>>> e.g.)
>>> $ ryu-manager --verbose ryu/app/simple_switch_13.py
>>> Registered VCS backend: git
>>> Registered VCS backend: hg
>>> Registered VCS backend: svn
>>> Registered VCS backend: bzr
>>> loading app ryu/app/simple_switch_13.py
>>> loading app ryu.controller.ofp_handler
>>> instantiating app ryu/app/simple_switch_13.py of SimpleSwitch13
>>> instantiating app ryu.controller.ofp_handler of OFPHandler
>>> BRICK ofp_event
>>> PROVIDES EventOFPSwitchFeatures TO {'SimpleSwitch13': {'config'}}
>>> PROVIDES EventOFPPacketIn TO {'SimpleSwitch13': {'main'}}
>>> CONSUMES EventOFPSwitchFeatures
>>> CONSUMES EventOFPHello
>>> CONSUMES EventOFPPortStatus
>>> CONSUMES EventOFPEchoRequest
>>> CONSUMES EventOFPErrorMsg
>>> CONSUMES EventOFPPortDescStatsReply
>>> CONSUMES EventOFPEchoReply
>>> BRICK SimpleSwitch13
>>> CONSUMES EventOFPSwitchFeatures
>>> CONSUMES EventOFPPacketIn
>>>
>>> Thanks,
>>> Iwase
>>>
>>>
>>>>
>>>> On Wed, May 17, 2017 at 2:15 AM Yikai Lin <[email protected]
>>>> <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>>
>>>> <mailto:[email protected] <mailto:[email protected]> <mailto:[email protected]
>>>> <mailto:[email protected]>>>> wrote:
>>>>
>>>> Hi,
>>>>
>>>> I was trying to wrote an "topology" like service app that exposes APIs
>>>> for other applications. So I started from mimicing the topology app, and I
>>>> created the api.py, event.py and the main file service.py. I have another
>>>> test program that basically calls the api and sends several sequential
>>>> requests to the service app and it basically just returns a reply for the
>>>> test program to print out. I ran into some issues:
>>>>
>>>> 1. I didn't put the codes under ryu's folder, I actually added my
>>>> project path and tried to run from there, but if I added
>>>> "handler.register_service('myapp.xxx.service')" to event.py, ryu-manager
>>>> tried to load two services xxx/service and xxx.service and it couldn't
>>>> find the latter
>>>> 2. If I didn't put that code in event.py, the two apps can run, but
>>>> only the first request was received and replied, after which an "event
>>>> lost" was reported. I didn't spawn any new threads in the service.py, just
>>>> a bunch of functions with decorators.
>>>>
>>>> So my questions will be, what will be a nice way to write a low-level
>>>> service app and where should I place them(if that matters)? And what is
>>>> the right way to implement that service app?
>>>>
>>>> Thanks a lot
>>>> Yikai
>>>>
>>>>
>>>>
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