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# ============LICENSE_START=======================================================
# Copyright (c) 2019 AT&T Intellectual Property. All rights reserved.
# ================================================================================
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============LICENSE_END=========================================================
"""Transform objects from one form to another"""
import json
from functools import partial
def extract_components_from_flow(flow):
"""Given a versionedFlowSnapshot object, extract out the processors
and create a list of tuples where each tuple is
(component name, component version)"""
extract = lambda p: (p["bundle"]["artifact"], p["bundle"]["version"])
return [ extract(p) for p in flow["flowContents"]["processors"] ]
def get_component(flow, components, processor_id):
def get_component(p):
bundle = p["bundle"]
return components.get((bundle["artifact"], bundle["version"]), None)
cs = [get_component(p) for p in flow["flowContents"]["processors"] \
if p["identifier"] == processor_id]
return cs[0] if cs else None
def make_fbp_from_flow(flow, components: "dict of (name, version) to components"):
"""Transform a versionedFlowSnapshot object into a runtime API (FBP) request
An example of an edge:
{
"command": "addedge",
"payload": {
"src" : {
"node": "comp1234",
"port": "DCAE-HELLO-WORLD-PUB-MR"
},
"tgt" : {
"node": "comp5678",
"port": "DCAE-HELLO-WORLD-SUB-MR"
},
"metadata":{
"name": "sample_topic_0",
"data_type": "json",
"dmaap_type": "MR"
}
},
"target_graph_id": "string"
}
"""
_get_component = partial(get_component, flow, components)
def parse_connection(conn):
rels = conn["selectedRelationships"]
if conn["source"]["type"] == "PROCESSOR":
comp = _get_component(conn["source"]["id"])
if not comp:
# REVIEW: Raise error?
return None
# Example:
# publishes:ves_specification:7.30.1:message router:ves-pnfRegistration-secondary
rels_pubs = [r for r in rels if "publishes" in r]
if rels_pubs:
_, _, _, transport_type, config_key = rels_pubs[0].split(":")
src = { "node": comp["id"], "port": config_key }
else:
# REVIEW: This should be an error?
src = { "node": comp["id"], "port": None }
else:
src = {}
if conn["destination"]["type"] == "PROCESSOR":
comp = _get_component(conn["destination"]["id"])
if not comp:
# REVIEW: Raise error?
return None
# Example:
# subscribes:predictin:1.0.0:message_router:predict_subscriber
rels_subs = [r for r in rels if "subscribes" in r]
if rels_subs:
_, _, _, transport_type, config_key = rels_subs[0].split(":")
tgt = { "node": comp["id"], "port": config_key }
else:
# REVIEW: This should be an error?
tgt = { "node": comp["id"], "port": None }
else:
tgt = {}
return { "command": "addedge"
, "payload": {
"src": src
, "tgt": tgt
, "metadata": {
"name": conn["name"]
# TODO: Question these hardcoded attributes
, "data_type": "json"
, "dmaap_type": "MR"
}
}
}
def parse_processor(p):
c = components[(p["bundle"]["artifact"], p["bundle"]["version"])]
return { "command": "addnode"
# TODO: spec is required to be a json string but runtime api
# changing this soon hopefully
, "payload": { "component_spec": json.dumps(c["spec"])
, "component_id": c["id"]
, "name": c["name"]
, "processor": p }
}
ps = [ parse_processor(p) for p in flow["flowContents"]["processors"] ]
cs = [ parse_connection(c) for c in flow["flowContents"]["connections"] ]
return ps+cs
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