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]> 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]>> 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]>>>
> > 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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