osdf rearchitecture into apps and libs

Change-Id: I2db2f8e252bd5e60807b2ffabf5a5b193a789f7a
Signed-off-by: vrvarma <vv8305@att.com>
Issue-ID: OPTFRA-637

1 files changed, 137 insertions, 0 deletions

diff --git a/apps/pci/optimizers/solver/optimizer.py b/apps/pci/optimizers/solver/optimizer.py
new file mode 100644
index 0000000..0a6d5a4
--- /dev/null
+++ b/apps/pci/optimizers/solver/optimizer.py
@@ -0,0 +1,137 @@
+# -------------------------------------------------------------------------
+#   Copyright (c) 2018 AT&T Intellectual Property
+#
+#   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.
+#
+# -------------------------------------------------------------------------
+#
+
+import itertools
+import os
+from collections import defaultdict
+
+import pymzn
+
+from .pci_utils import get_id
+
+BASE_DIR = os.path.dirname(__file__)
+
+
+def pci_optimize(network_cell_info, cell_info_list, request_json):
+    neighbor_edges = get_neighbor_list(network_cell_info)
+    second_level_edges = get_second_level_neighbor(network_cell_info)
+    ignorable_links = get_ignorable_links(network_cell_info, request_json)
+    anr_flag = is_anr(request_json)
+
+    dzn_data = build_dzn_data(cell_info_list, ignorable_links, neighbor_edges, second_level_edges, anr_flag)
+
+    return build_pci_solution(dzn_data, ignorable_links, anr_flag)
+
+
+def build_pci_solution(dzn_data, ignorable_links, anr_flag):
+    mzn_solution = solve(get_mzn_model(anr_flag), dzn_data)
+
+    solution = {'pci': mzn_solution[0]['pci']}
+
+    if anr_flag:
+        removables = defaultdict(list)
+        used_ignorables = mzn_solution[0]['used_ignorables']
+        index = 0
+        for i in ignorable_links:
+            if used_ignorables[index] > 0:
+                removables[i[0]].append(i[1])
+            index += 1
+        solution['removables'] = removables
+    return solution
+
+
+def build_dzn_data(cell_info_list, ignorable_links, neighbor_edges, second_level_edges, anr_flag):
+    dzn_data = {
+        'NUM_NODES': len(cell_info_list),
+        'NUM_PCIS': len(cell_info_list),
+        'NUM_NEIGHBORS': len(neighbor_edges),
+        'NEIGHBORS': get_list(neighbor_edges),
+        'NUM_SECOND_LEVEL_NEIGHBORS': len(second_level_edges),
+        'SECOND_LEVEL_NEIGHBORS': get_list(second_level_edges)
+    }
+    if anr_flag:
+        dzn_data['NUM_IGNORABLE_NEIGHBOR_LINKS'] = len(ignorable_links)
+        dzn_data['IGNORABLE_NEIGHBOR_LINKS'] = get_list(ignorable_links)
+    return dzn_data
+
+
+def get_mzn_model(anr_flag):
+    if anr_flag:
+        mzn_model = os.path.join(BASE_DIR, 'min_confusion_inl.mzn')
+    else:
+        mzn_model = os.path.join(BASE_DIR, 'no_conflicts_no_confusion.mzn')
+    return mzn_model
+
+
+def is_anr(request_json):
+    return 'pci-anr' in request_json["requestInfo"]["optimizers"]
+
+
+def get_list(edge_list):
+    array_list = []
+    for s in edge_list:
+        array_list.append([s[0], s[1]])
+    return sorted(array_list)
+
+
+def solve(mzn_model, dzn_data):
+    return pymzn.minizinc(mzn=mzn_model, data=dzn_data)
+
+
+def get_neighbor_list(network_cell_info):
+    neighbor_list = set()
+    for cell in network_cell_info['cell_list']:
+        add_to_neighbor_list(network_cell_info, cell, neighbor_list)
+    return neighbor_list
+
+
+def add_to_neighbor_list(network_cell_info, cell, neighbor_list):
+    for nbr in cell.get('nbr_list', []):
+        host_id = cell['id']
+        nbr_id = get_id(network_cell_info, nbr['targetCellId'])
+        if nbr_id and host_id != nbr_id:
+            neighbor_list.add((host_id, nbr_id))
+
+
+def get_second_level_neighbor(network_cell_info):
+    second_neighbor_list = set()
+    for cell in network_cell_info['cell_list']:
+        comb_list = build_second_level_list(network_cell_info, cell)
+        for comb in comb_list:
+            if comb[0] and comb[1]:
+                second_neighbor_list.add((comb[0], comb[1]))
+    return sorted(second_neighbor_list)
+
+
+def build_second_level_list(network_cell_info, cell):
+    second_nbr_list = []
+    for nbr in cell.get('nbr_list', []):
+        second_nbr_list.append(get_id(network_cell_info, nbr['targetCellId']))
+    return [list(elem) for elem in list(itertools.combinations(second_nbr_list, 2))]
+
+
+def get_ignorable_links(network_cell_info, request_json):
+    ignorable_list = set()
+    anr_input_list = request_json["cellInfo"].get('anrInputList', [])
+    if anr_input_list:
+        for anr_info in anr_input_list:
+            cell_id = get_id(network_cell_info, anr_info['cellId'])
+            anr_removable = anr_info.get('removeableNeighbors', [])
+            for anr in anr_removable:
+                ignorable_list.add((cell_id, get_id(network_cell_info, anr)))
+    return ignorable_list