feat: add decoded_properties method to ServiceInfo (#1332)

src/zeroconf/_services/info.pxd

@@ -53,6 +53,7 @@ cdef class ServiceInfo(RecordUpdateListener):
     cdef public str server
     cdef public str server_key
     cdef public cython.dict _properties
+    cdef public cython.dict _decoded_properties
     cdef public object host_ttl
     cdef public object other_ttl
     cdef public object interface_index
@@ -72,6 +73,9 @@ cdef class ServiceInfo(RecordUpdateListener):
     @cython.locals(length="unsigned char", index="unsigned int", key_value=bytes, key_sep_value=tuple)
     cdef void _unpack_text_into_properties(self)
 
+    @cython.locals(k=bytes, v=bytes)
+    cdef void _generate_decoded_properties(self)
+
     @cython.locals(properties_contain_str=bint)
     cpdef _set_properties(self, cython.dict properties)
 

src/zeroconf/_services/info.py

@@ -143,6 +143,7 @@ class ServiceInfo(RecordUpdateListener):
         "server",
         "server_key",
         "_properties",
+        "_decoded_properties",
         "host_ttl",
         "other_ttl",
         "interface_index",
@@ -192,6 +193,7 @@ def __init__(
         self.server = server if server else None
         self.server_key = server.lower() if server else None
         self._properties: Optional[Dict[bytes, Optional[bytes]]] = None
+        self._decoded_properties: Optional[Dict[str, Optional[str]]] = None
         if isinstance(properties, bytes):
             self._set_text(properties)
         else:
@@ -268,6 +270,15 @@ def properties(self) -> Dict[bytes, Optional[bytes]]:
             assert self._properties is not None
         return self._properties
 
+    @property
+    def decoded_properties(self) -> Dict[str, Optional[str]]:
+        """Return properties as strings."""
+        if self._decoded_properties is None:
+            self._generate_decoded_properties()
+        if TYPE_CHECKING:
+            assert self._decoded_properties is not None
+        return self._decoded_properties
+
     def async_clear_cache(self) -> None:
         """Clear the cache for this service info."""
         self._dns_address_cache = None
@@ -384,6 +395,14 @@ def _set_text(self, text: bytes) -> None:
         self.text = text
         # Clear the properties cache
         self._properties = None
+        self._decoded_properties = None
+
+    def _generate_decoded_properties(self) -> None:
+        """Generates decoded properties from the properties"""
+        self._decoded_properties = {
+            k.decode("ascii", "replace"): None if v is None else v.decode("utf-8", "replace")
+            for k, v in self.properties.items()
+        }
 
     def _unpack_text_into_properties(self) -> None:
         """Unpacks the text field into properties"""

tests/test_services.py

@@ -134,6 +134,13 @@ def update_service(self, zeroconf, type, name):
             assert info.properties[b'prop_true'] == b'1'
             assert info.properties[b'prop_false'] == b'0'
 
+            assert info.decoded_properties['prop_none'] is None
+            assert info.decoded_properties['prop_string'] == b'a_prop'.decode('utf-8')
+            assert info.decoded_properties['prop_float'] == '1.0'
+            assert info.decoded_properties['prop_blank'] == b'a blanked string'.decode('utf-8')
+            assert info.decoded_properties['prop_true'] == '1'
+            assert info.decoded_properties['prop_false'] == '0'
+
             assert info.addresses == addresses[:1]  # no V6 by default
             assert set(info.addresses_by_version(r.IPVersion.All)) == set(addresses)
 
@@ -194,11 +201,13 @@ def update_service(self, zeroconf, type, name):
             info = zeroconf_browser.get_service_info(type_, registration_name)
             assert info is not None
             assert info.properties[b'prop_blank'] == properties['prop_blank']
+            assert info.decoded_properties['prop_blank'] == b'an updated string'.decode('utf-8')
 
             cached_info = ServiceInfo(subtype, registration_name)
             cached_info.load_from_cache(zeroconf_browser)
             assert cached_info.properties is not None
             assert cached_info.properties[b'prop_blank'] == properties['prop_blank']
+            assert cached_info.decoded_properties['prop_blank'] == b'an updated string'.decode('utf-8')
 
             zeroconf_registrar.unregister_service(info_service)
             service_removed.wait(1)