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authorOle Troan <ot@cisco.com>2020-05-20 15:47:06 +0200
committerNeale Ranns <nranns@cisco.com>2020-05-25 11:22:34 +0000
commitf5db3711b28db4e364ac01be8b124dd24d573782 (patch)
treeeee3c8aabae4287bf89c0e545e2400770fc223cb /src/vpp-api/python/vpp_papi
parentafc233aa93c3f23b30b756cb4ae2967f968bbbb1 (diff)
api: add new stream message convention
Instead of having to wrap dump/detail calls in control ping, send details messages in between a normal reply / request pair. As expressed in the below service statement. Example: service { rpc map_domains_gets returns map_domains_get_reply stream map_domain_details; }; define map_domains_get { u32 client_index; u32 context; u32 cursor; }; define map_domains_get_reply { u32 context; i32 retval; u32 cursor; }; To avoid blocking the main thread for too long, the replies are now sent in client message queue size chunks. The reply message returns VNET_API_ERROR_EAGAIN when there is more to read. The API handler must also include a "cursor" that is used to the next call to the get function. API handler example: REPLY_AND_DETAILS_MACRO (VL_API_MAP_DOMAINS_GET_REPLY, mm->domains, ({ send_domain_details (cursor, rp, mp->context); })); The macro starts from cursor and iterates through the pool until vl_api_process_may_suspend() returns true or the iteration reaches the end of the list. Client Example: cursor = 0 d = [] while True: rv, details = map_domains_get(cursor=cursor) d += details if rv.retval == 0 or rv.retval != -165: break cursor = rv.cursor or the convenience iterator: for x in vpp.details_iter(vpp.api.map_domains_get): pass or list(details_iter(map_domains_get)) Change-Id: Iad9f6b41b0ef886adb584c97708dd91cf552749e Type: feature Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'src/vpp-api/python/vpp_papi')
-rw-r--r--src/vpp-api/python/vpp_papi/vpp_papi.py50
1 files changed, 36 insertions, 14 deletions
diff --git a/src/vpp-api/python/vpp_papi/vpp_papi.py b/src/vpp-api/python/vpp_papi/vpp_papi.py
index 6c17fa88c95..192168772ec 100644
--- a/src/vpp-api/python/vpp_papi/vpp_papi.py
+++ b/src/vpp-api/python/vpp_papi/vpp_papi.py
@@ -472,12 +472,7 @@ class VPPApiClient(object):
# Create function for client side messages.
if name in self.services:
- if 'stream' in self.services[name] and \
- self.services[name]['stream']:
- multipart = True
- else:
- multipart = False
- f = self.make_function(msg, i, multipart, do_async)
+ f = self.make_function(msg, i, self.services[name], do_async)
setattr(self._api, name, FuncWrapper(f))
else:
self.logger.debug(
@@ -644,7 +639,7 @@ class VPPApiClient(object):
n[1]['avg'], n[1]['max'])
return s
- def _call_vpp(self, i, msgdef, multipart, **kwargs):
+ def _call_vpp(self, i, msgdef, service, **kwargs):
"""Given a message, send the message and await a reply.
msgdef - the message packing definition
@@ -686,10 +681,21 @@ class VPPApiClient(object):
self.transport.write(b)
- if multipart:
- # Send a ping after the request - we use its response
- # to detect that we have seen all results.
- self._control_ping(context)
+ msgreply = service['reply']
+ stream = True if 'stream' in service else False
+ if stream:
+ if 'stream_msg' in service:
+ # New service['reply'] = _reply and service['stream_message'] = _details
+ stream_message = service['stream_msg']
+ modern =True
+ else:
+ # Old service['reply'] = _details
+ stream_message = msgreply
+ msgreply = 'control_ping_reply'
+ modern = False
+ # Send a ping after the request - we use its response
+ # to detect that we have seen all results.
+ self._control_ping(context)
# Block until we get a reply.
rl = []
@@ -702,11 +708,14 @@ class VPPApiClient(object):
# Message being queued
self.message_queue.put_nowait(r)
continue
-
- if not multipart:
+ if msgname != msgreply and (stream and (msgname != stream_message)):
+ print('REPLY MISMATCH', msgreply, msgname, stream_message, stream)
+ if not stream:
rl = r
break
- if msgname == 'control_ping_reply':
+ if msgname == msgreply:
+ if modern: # Return both reply and list
+ rl = r, rl
break
rl.append(r)
@@ -847,6 +856,19 @@ class VPPApiClient(object):
self.logger, self.read_timeout, self.use_socket,
self.server_address)
+ def details_iter(self, f, **kwargs):
+ cursor = 0
+ while True:
+ kwargs['cursor'] = cursor
+ rv, details = f(**kwargs)
+ #
+ # Convert to yield from details when we only support python 3
+ #
+ for d in details:
+ yield d
+ if rv.retval == 0 or rv.retval != -165:
+ break
+ cursor = rv.cursor
# Provide the old name for backward compatibility.
VPP = VPPApiClient