pqm

@@ -33,7 +33,7 @@ import yaml
 T = typing.TypeVar('T')
 
 
-@dataclasses.dataclass(slots=True)
+@dataclasses.dataclass
 class Config:
     # if not remote_sources are configured -> use local queue
     remote_sources: dict[str, str] = dataclasses.field(default_factory=dict)
@@ -157,7 +157,7 @@ async def trio_parallel_ordered(
         await tpo.close()
 
 
-@dataclasses.dataclass(slots=True)
+@dataclasses.dataclass
 class Recipient:
     """Recipient in a postfix mail"""
     address: str
@@ -184,22 +184,7 @@ class QueueName(enum.Enum):
 ALL_QUEUE_NAMES: set[QueueName] = set(QueueName)
 
 
-def json_decode_stream(data: str):
+@dataclasses.dataclass
-    decoder = json.JSONDecoder()
-    data_len = len(data)
-    data_pos = 0
-    while data_len > data_pos and data[data_len-1].isspace():
-        data_len -= 1
-    while True:
-        while data_pos < data_len and data[data_pos].isspace():
-            data_pos += 1
-        if data_pos >= data_len:
-            return
-        obj, data_pos = decoder.raw_decode(data, data_pos)
-        yield obj
-
-
-@dataclasses.dataclass(slots=True)
 class Mail:
     """Metadata for mail in postfix queue"""
     queue_name: QueueName
@@ -224,7 +209,11 @@ class Mail:
     @staticmethod
     def read_postqueue_json(data: str, id_prefix: str = '') -> list[Mail]:
         queue = []
-        for obj in json_decode_stream(data):
+        decoder = json.JSONDecoder()
+        data = data.strip()
+        while data:
+            obj, end = decoder.raw_decode(data, 0)
+            data = data[end:].lstrip()
             mail = Mail.from_json(obj)
             mail.queue_id = id_prefix + mail.queue_id
             queue.append(mail)
@@ -233,8 +222,6 @@ class Mail:
 
 # abstract collection/cluster of postfix nodes (or just a single one)
 class Source(abc.ABC):
-    __slots__ = ()
-
     # list of server names in collection
     @abc.abstractmethod
     def server_list(self) -> list[str]:
@@ -333,8 +320,6 @@ class Source(abc.ABC):
 
 
 class LocalSource(Source):
-    __slots__ = ()
-
     def server_list(self) -> list[str]:
         return [socket.gethostname()]
 
@@ -392,8 +377,6 @@ class LocalSource(Source):
 
 
 class RemoteSource(Source):
-    __slots__ = ('remotes',)
-
     def __init__(self, remotes: dict[str, str]) -> None:
         super().__init__()
         self.remotes = remotes
@@ -526,8 +509,6 @@ class RemoteSource(Source):
 
 
 class UserActivityStats:
-    __slots__ = ('count_mails', 'related_mails', 'cut_off')
-
     # find most active address for `health` command
 
     def __init__(self, cut_off: int = 10) -> None:
@@ -596,8 +577,6 @@ class UserActivityStats:
 class Filter(abc.ABC):
     """abstract base class for filter expressions"""
 
-    __slots__ = ()
-
     def __init__(self) -> None:
         pass
 
@@ -660,14 +639,11 @@ class Filter(abc.ABC):
 
 # abstract base class for filters that don't need (...) around in representations of members in combined filters
 class SingleExprFilter(Filter):
-    __slots__ = ()
+    pass
 
 
 class FalseFilter(SingleExprFilter):
     """constant false - matches no mail"""
-
-    __slots__ = ()
-
     def __repr__(self) -> str:
         return '0'
 
@@ -693,9 +669,6 @@ class FalseFilter(SingleExprFilter):
 
 class TrueFilter(SingleExprFilter):
     """constant true - matches all mail"""
-
-    __slots__ = ()
-
     def __repr__(self) -> str:
         return '1'
 
@@ -724,8 +697,6 @@ TRUE_FILTER = TrueFilter()
 
 
 class AndFilter(Filter):
-    __slots__ = ('expressions',)
-
     def __init__(self, expressions: list[Filter] | tuple[()] = ()) -> None:
         super().__init__()
         self.expressions: list[Filter] = expressions or []
@@ -779,8 +750,6 @@ class AndFilter(Filter):
 
 
 class OrFilter(Filter):
-    __slots__ = ('expressions',)
-
     def __init__(self, expressions: list[Filter] | tuple[()] = ()) -> None:
         super().__init__()
         self.expressions: list[Filter] = expressions or []
@@ -834,8 +803,6 @@ class OrFilter(Filter):
 
 
 class NotFilter(SingleExprFilter):
-    __slots__ = ('expression',)
-
     def __init__(self, expression: Filter) -> None:
         super().__init__()
         self.expression = expression
@@ -873,9 +840,6 @@ class NotFilter(SingleExprFilter):
 
 class QueueFilter(SingleExprFilter):
     """match mails based on queue they are in"""
-
-    __slots__ = ('select',)
-
     def __init__(self, select: list[QueueName]) -> None:
         self.select = set(select)
 
@@ -934,8 +898,6 @@ class AddressSelector(enum.Enum):
 
 
 class BaseAddressPattern(abc.ABC):
-    __slots__ = ()
-
     # abstract base class of patterns to use to match a mail address
     # subclasses match either: full address, domain part, regex
     def __init__(self) -> None:
@@ -968,8 +930,6 @@ class BaseAddressPattern(abc.ABC):
 
 
 class AddressPattern(BaseAddressPattern):
-    __slots__ = ('address',)
-
     # match full address exactly
     def __init__(self, address: str) -> None:
         super().__init__()
@@ -992,8 +952,6 @@ class AddressPattern(BaseAddressPattern):
 
 
 class AddressDomainPattern(BaseAddressPattern):
-    __slots__ = ('domain',)
-
     # match address by domain
     def __init__(self, domain: str) -> None:
         super().__init__()
@@ -1011,8 +969,6 @@ class AddressDomainPattern(BaseAddressPattern):
 
 
 class AddressRegexMatch(BaseAddressPattern):
-    __slots__ = ('address',)
-
     # match address by regex
     def __init__(self, address: str | re.Pattern[str]) -> None:
         super().__init__()
@@ -1034,8 +990,6 @@ class AddressRegexMatch(BaseAddressPattern):
 
 
 class AddressFilter(SingleExprFilter):
-    __slots__ = ('selector', 'patterns')
-
     # match mails by address
     def __init__(self, selector: AddressSelector, patterns: list[BaseAddressPattern]) -> None:
         self.selector = selector