Refactored system schema dataclasses.

- `percent_field` should be declared on `platypush.schemas.dataclasses`
  level, since it's not specific to the `system` plugin.
- Added a common `SystemBaseSchema` that takes care of calling
  `_asdict()` if the object is passed as a `psutil` object instead of a
  dict.

platypush/plugins/system/__init__.py

@@ -151,7 +151,7 @@ class SystemPlugin(SensorPlugin, EntityManager):
 
     def _cpu_stats(self) -> CpuStats:
         stats = psutil.cpu_stats()
-        return CpuStatsSchema().load(stats._asdict())  # type: ignore
+        return CpuStatsSchema().load(stats)  # type: ignore
 
     @action
     def cpu_stats(self) -> CpuStats:
@@ -164,11 +164,11 @@ class SystemPlugin(SensorPlugin, EntityManager):
 
     def _cpu_frequency_avg(self) -> CpuFrequency:
         freq = psutil.cpu_freq(percpu=False)
-        return CpuFrequencySchema().load(freq._asdict())  # type: ignore
+        return CpuFrequencySchema().load(freq)  # type: ignore
 
     def _cpu_frequency_per_cpu(self) -> List[CpuFrequency]:
         freq = psutil.cpu_freq(percpu=True)
-        return CpuFrequencySchema().load(freq._asdict(), many=True)  # type: ignore
+        return CpuFrequencySchema().load(freq, many=True)  # type: ignore
 
     @action
     def cpu_frequency(
@@ -198,9 +198,7 @@ class SystemPlugin(SensorPlugin, EntityManager):
         return psutil.getloadavg()
 
     def _mem_virtual(self) -> MemoryStats:
-        return MemoryStatsSchema().load(
-            psutil.virtual_memory()._asdict()
-        )  # type: ignore
+        return MemoryStatsSchema().load(psutil.virtual_memory())  # type: ignore
 
     @action
     def mem_virtual(self) -> dict:
@@ -212,7 +210,7 @@ class SystemPlugin(SensorPlugin, EntityManager):
         return MemoryStatsSchema().dump(self._mem_virtual())  # type: ignore
 
     def _mem_swap(self) -> SwapStats:
-        return SwapStatsSchema().load(psutil.swap_memory()._asdict())  # type: ignore
+        return SwapStatsSchema().load(psutil.swap_memory())  # type: ignore
 
     @action
     def mem_swap(self) -> dict:
@@ -226,7 +224,6 @@ class SystemPlugin(SensorPlugin, EntityManager):
     def _disk_info(self) -> List[Disk]:
         parts = {part.device: part._asdict() for part in psutil.disk_partitions()}
         basename_parts = {os.path.basename(part): part for part in parts}
-
         io_stats = {
             basename_parts[disk]: stats._asdict()
             for disk, stats in psutil.disk_io_counters(perdisk=True).items()
@@ -234,7 +231,7 @@ class SystemPlugin(SensorPlugin, EntityManager):
         }
 
         usage = {
-            disk: psutil.disk_usage(info['mountpoint'])._asdict()
+            disk: psutil.disk_usage(info['mountpoint'])._asdict()  # type: ignore
             for disk, info in parts.items()
         }
 

platypush/schemas/dataclasses/__init__.py

@@ -1,3 +1,4 @@
+from dataclasses import field
 from datetime import date, datetime
 from uuid import UUID
 
@@ -6,11 +7,26 @@ from marshmallow import (
     Schema,
     fields,
     post_dump,
+    pre_load,
 )
+from marshmallow.validate import Range
 
 from .. import Date, DateTime
 
 
+def percent_field(**kwargs):
+    """
+    Field used to model percentage float fields between 0 and 1.
+    """
+    return field(
+        default_factory=float,
+        metadata={
+            'validate': Range(min=0, max=1),
+            **kwargs,
+        },
+    )
+
+
 class DataClassSchema(Schema):
     """
     Base schema class for data classes that support Marshmallow schemas.
@@ -45,6 +61,10 @@ class DataClassSchema(Schema):
 
         return matching_fields[0]
 
+    @pre_load
+    def pre_load(self, data, **__) -> dict:
+        return data
+
     @post_dump
     def post_dump(self, data: dict, **__) -> dict:
         # Use data_key parameters only for load

platypush/schemas/system/_base.py

@@ -1,16 +1,15 @@
-from dataclasses import field
+from marshmallow import pre_load
 
-from marshmallow.validate import Range
+from platypush.schemas.dataclasses import DataClassSchema
 
 
-def percent_field(**kwargs):
+class SystemBaseSchema(DataClassSchema):
     """
-    Field used to model percentage float fields between 0 and 1.
+    Base schema for system info.
     """
-    return field(
-        default_factory=float,
-        metadata={
-            'validate': Range(min=0, max=1),
-            **kwargs,
-        },
-    )
+
+    @pre_load
+    def pre_load(self, data, **_) -> dict:
+        if hasattr(data, '_asdict'):
+            data = data._asdict()
+        return data

platypush/schemas/system/_connection/_base.py

@@ -1,18 +1,16 @@
 from marshmallow import pre_load
 
-from platypush.schemas.dataclasses import DataClassSchema
+from .._base import SystemBaseSchema
 
 
-class ConnectionBaseSchema(DataClassSchema):
+class ConnectionBaseSchema(SystemBaseSchema):
     """
     Base schema for connections.
     """
 
     @pre_load
     def pre_load(self, data, **_) -> dict:
-        if hasattr(data, '_asdict'):
-            data = data._asdict()
-
+        data = super().pre_load(data)
         addr_mapping = {
             'laddr': ('local_address', 'local_port'),
             'raddr': ('remote_address', 'remote_port'),

platypush/schemas/system/_cpu/_base.py

@@ -1,15 +1,16 @@
 from marshmallow import pre_load
 
-from platypush.schemas.dataclasses import DataClassSchema
+from .._base import SystemBaseSchema
 
 
-class CpuInfoBaseSchema(DataClassSchema):
+class CpuInfoBaseSchema(SystemBaseSchema):
     """
     Base schema for CPU info.
     """
 
     @pre_load
     def pre_load(self, data: dict, **_) -> dict:
+        data = super().pre_load(data)
         if data.get('hz_advertised'):
             data['frequency_advertised'] = data.pop('hz_advertised')[0]
         if data.get('hz_actual'):
@@ -18,7 +19,7 @@ class CpuInfoBaseSchema(DataClassSchema):
         return data
 
 
-class CpuTimesBaseSchema(DataClassSchema):
+class CpuTimesBaseSchema(SystemBaseSchema):
     """
     Base schema for CPU times.
     """
@@ -29,6 +30,7 @@ class CpuTimesBaseSchema(DataClassSchema):
         Convert the underlying object to dict and normalize all the percentage
         values from [0, 100] to [0, 1].
         """
+        data = super().pre_load(data)
         return {
             key: value / 100.0
             for key, value in (

platypush/schemas/system/_cpu/_model.py

@@ -1,7 +1,7 @@
 from dataclasses import dataclass, field
 from typing import List, Optional, Tuple
 
-from .._base import percent_field
+from platypush.schemas.dataclasses import percent_field
 
 
 @dataclass

platypush/schemas/system/_cpu/_schemas.py

@@ -1,12 +1,11 @@
 from marshmallow_dataclass import class_schema
 
-from platypush.schemas.dataclasses import DataClassSchema
-
+from .._base import SystemBaseSchema
 from ._base import CpuInfoBaseSchema, CpuTimesBaseSchema
 from ._model import CpuFrequency, CpuInfo, CpuStats, CpuTimes
 
 
-CpuFrequencySchema = class_schema(CpuFrequency, base_schema=DataClassSchema)
+CpuFrequencySchema = class_schema(CpuFrequency, base_schema=SystemBaseSchema)
 CpuInfoSchema = class_schema(CpuInfo, base_schema=CpuInfoBaseSchema)
 CpuTimesSchema = class_schema(CpuTimes, base_schema=CpuTimesBaseSchema)
-CpuStatsSchema = class_schema(CpuStats, base_schema=DataClassSchema)
+CpuStatsSchema = class_schema(CpuStats, base_schema=SystemBaseSchema)

platypush/schemas/system/_disk/_base.py

@@ -1,15 +1,17 @@
 from marshmallow import pre_load
 
-from platypush.schemas.dataclasses import DataClassSchema
+from .._base import SystemBaseSchema
 
 
-class DiskBaseSchema(DataClassSchema):
+class DiskBaseSchema(SystemBaseSchema):
     """
     Base schema for disk stats.
     """
 
     @pre_load
     def pre_load(self, data: dict, **_) -> dict:
+        data = super().pre_load(data)
+
         # Convert read/write/busy times from milliseconds to seconds
         for attr in ['read_time', 'write_time', 'busy_time']:
             if data.get(attr) is not None:

platypush/schemas/system/_disk/_model.py

@@ -1,7 +1,7 @@
 from dataclasses import dataclass, field
 from typing import Optional
 
-from .._base import percent_field
+from platypush.schemas.dataclasses import percent_field
 
 
 @dataclass

platypush/schemas/system/_memory/_base.py

@@ -1,15 +1,17 @@
 from marshmallow import pre_load
 
-from platypush.schemas.dataclasses import DataClassSchema
+from .._base import SystemBaseSchema
 
 
-class MemoryStatsBaseSchema(DataClassSchema):
+class MemoryStatsBaseSchema(SystemBaseSchema):
     """
     Base schema for memory stats.
     """
 
     @pre_load
     def pre_load(self, data: dict, **_) -> dict:
+        data = super().pre_load(data)
+
         # Normalize the percentage between 0 and 1
         if data.get('percent') is not None:
             data['percent'] /= 100

platypush/schemas/system/_memory/_model.py

@@ -1,6 +1,6 @@
 from dataclasses import dataclass, field
 
-from .._base import percent_field
+from platypush.schemas.dataclasses import percent_field
 
 
 @dataclass

platypush/schemas/system/_network/_base.py

@@ -1,15 +1,16 @@
 from marshmallow import pre_load
 
-from platypush.schemas.dataclasses import DataClassSchema
+from .._base import SystemBaseSchema
 
 
-class NetworkInterfaceBaseSchema(DataClassSchema):
+class NetworkInterfaceBaseSchema(SystemBaseSchema):
     """
     Base schema for network interface stats.
     """
 
     @pre_load
     def pre_load(self, data: dict, **_) -> dict:
+        data = super().pre_load(data)
         for in_attr, out_attr in {
             'errin': 'errors_in',
             'errout': 'errors_out',