fix #54

handle empty list of communities

hyperglass/parsing/juniper.py

@@ -1,18 +1,24 @@
 """Parse Juniper XML Response to Structured Data."""
 
+# Standard Library
+from typing import Dict, Iterable
+
 # Third Party
 import xmltodict
+from pydantic import ValidationError
 
 # Project
 from hyperglass.log import log
+from hyperglass.util import validation_error_message
 from hyperglass.exceptions import ParsingError, ResponseEmpty
 from hyperglass.configuration import params
 from hyperglass.parsing.models.juniper import JuniperRoute
 
 
-def parse_juniper(output):
+def parse_juniper(output: Iterable) -> Dict:  # noqa: C901
     """Parse a Juniper BGP XML response."""
     data = {}
+
     for i, response in enumerate(output):
         try:
             parsed = xmltodict.parse(
@@ -48,4 +54,8 @@ def parse_juniper(output):
             log.critical(f"'{str(err)}' was not found in the response")
             raise ParsingError("Error parsing response data")
 
+        except ValidationError as err:
+            log.critical(str(err))
+            raise ParsingError(validation_error_message(*err.errors()))
+
     return data

hyperglass/parsing/models/juniper.py

@@ -44,7 +44,7 @@ class JuniperRouteTableEntry(_JuniperBase):
     peer_as: int
     source_as: int
     source_rid: StrictStr
-    communities: List[StrictStr]
+    communities: List[StrictStr] = None
 
     @root_validator(pre=True)
     def validate_optional_flags(cls, values):
@@ -105,7 +105,11 @@ def validate_as_path(cls, value):
     @validator("communities", pre=True, always=True)
     def validate_communities(cls, value):
         """Flatten community list."""
-        return value.get("community", [])
+        if value is not None:
+            flat = value.get("community", [])
+        else:
+            flat = []
+        return flat
 
 
 class JuniperRouteTable(_JuniperBase):