Add caching for COmanage API data

Writes the osggids to project name dict to a file containing the epoch time the cache was made. If the file is found to exist and was made in the past 0.5 hours (by default), the program will read from the cache instead of making COmanage API calls. Otherwise, the program will get the project data from the API and overwrite any existing cache.

Author: williamnswanson

osg-comanage-project-usermap.py

@@ -4,6 +4,7 @@
 import os
 import sys
 import json
+import time
 import getopt
 import subprocess
 import urllib.error
@@ -16,6 +17,8 @@
 MINTIMEOUT = 5
 MAXTIMEOUT = 625
 TIMEOUTMULTIPLE = 5
+CACHE_FILENAME = "COmanage_Projects_cache.txt"
+CACHE_LIFETIME_HOURS = 0.5
 
 LDAP_AUTH_COMMAND = [
     "awk", "/ldap_default_authtok/ {print $3}", "/etc/sssd/conf.d/0060_domain_CILOGON.ORG.conf",
@@ -275,14 +278,16 @@ def get_ldap_active_users(filter_group_name):
             stdout=subprocess.PIPE
             ).stdout.decode('utf-8').strip()
 
-    filter_str = ("(isMemberOf=CO:members:active)" if filter_group_name is None else f"(&(isMemberOf={filter_group_name})(isMemberOf=CO:members:active))")
+    filter_str = ("(isMemberOf=CO:members:active)" if filter_group_name is None 
+                  else f"(&(isMemberOf={filter_group_name})(isMemberOf=CO:members:active))")
 
     ldap_active_users_command = LDAP_ACTIVE_USERS_COMMAND
     ldap_active_users_command[LDAP_ACTIVE_USERS_COMMAND.index("{auth}")] = auth_str
     ldap_active_users_command[LDAP_ACTIVE_USERS_COMMAND.index("{filter}")] = filter_str
 
     active_users = subprocess.run(ldap_active_users_command, stdout=subprocess.PIPE).stdout.decode('utf-8').split('\n')
-    users = set(line.replace("voPersonApplicationUID: ", "") if re.compile("dn: voPerson*") else "" for line in active_users)
+    users = set(line.replace("voPersonApplicationUID: ", "") if re.compile("dn: voPerson*") 
+                else "" for line in active_users)
     return users
 
 
@@ -299,9 +304,7 @@ def create_user_to_projects_map(project_to_user_map, active_users, osggids_to_na
     return users_to_projects_map
 
 
-def get_co_api_data():
-    #TODO add cacheing for COManage API data
-
+def get_groups_data_from_api():
     groups = get_osg_co_groups__map()
     project_osggids_to_name = dict()
     for id,name in groups.items():
@@ -310,6 +313,32 @@ def get_co_api_data():
     return project_osggids_to_name
 
 
+def get_co_api_data():
+    try:
+        r = open(CACHE_FILENAME, "r")
+        lines = r.readlines()
+        if float(lines[0]) >= (time.time() - (60 * 60 * CACHE_LIFETIME_HOURS)):
+            entries = lines[1:len(lines)]
+            project_osggids_to_name = dict()
+            for entry in entries:
+                osggid_name_pair = entry.split(":")
+                if len(osggid_name_pair) == 2:
+                    project_osggids_to_name[osggid_name_pair[0]] = osggid_name_pair[1]
+        else:
+            raise OSError
+    except OSError:
+        with open(CACHE_FILENAME, "w") as w:
+            project_osggids_to_name = get_groups_data_from_api()
+            print(time.time(), file=w)
+            for osggid, name in project_osggids_to_name.items():
+                print(f"{osggid}:{name}", file=w)
+    finally:
+        if r:
+            r.close()
+
+    return project_osggids_to_name
+
+
 def get_osguser_groups(filter_group_name=None):
     project_osggids_to_name = get_co_api_data()
     ldap_groups_members = get_ldap_group_members_data()