add json serialization

CHANGELOG.rst

@@ -1,5 +1,9 @@
 Change Log
 ----------
+**0.21** (2020-05-25)
+
+- All objects can produce a json serialization of their state.
+
 **0.20** (2020-05-12)
 
 - All objects can now print their values

dsmr_parser/objects.py

@@ -1,5 +1,7 @@
 import dsmr_parser.obis_name_mapping
 import datetime
+import json
+from decimal import Decimal
 
 
 class Telegram(object):
@@ -52,6 +54,9 @@ class Telegram(object):
             output += "{}: \t {}\n".format(attr, str(value))
         return output
 
+    def to_json(self):
+        return json.dumps(dict([[attr, json.loads(value.to_json())] for attr, value in self]))
+
 
 class DSMRObject(object):
     """
@@ -92,6 +97,22 @@ class MBusObject(DSMRObject):
         output = "{}\t[{}] at {}".format(str(self.value), str(self.unit), str(self.datetime.astimezone().isoformat()))
         return output
 
+    def to_json(self):
+        timestamp = self.datetime
+        if isinstance(self.datetime, datetime.datetime):
+            timestamp = self.datetime.astimezone().isoformat()
+        value = self.value
+        if isinstance(self.value, datetime.datetime):
+            value = self.value.astimezone().isoformat()
+        if isinstance(self.value, Decimal):
+            value = float(self.value)
+        output = {
+            'datetime': timestamp,
+            'value': value,
+            'unit': self.unit
+        }
+        return json.dumps(output)
+
 
 class CosemObject(DSMRObject):
 
@@ -110,6 +131,18 @@ class CosemObject(DSMRObject):
         output = "{}\t[{}]".format(str(print_value), str(self.unit))
         return output
 
+    def to_json(self):
+        json_value = self.value
+        if isinstance(self.value, datetime.datetime):
+            json_value = self.value.astimezone().isoformat()
+        if isinstance(self.value, Decimal):
+            json_value = float(self.value)
+        output = {
+            'value': json_value,
+            'unit': self.unit
+        }
+        return json.dumps(output)
+
 
 class ProfileGenericObject(DSMRObject):
     """
@@ -140,18 +173,6 @@ class ProfileGenericObject(DSMRObject):
                 self._buffer_list.append(MBusObject([self.values[offset], self.values[offset + 1]]))
         return self._buffer_list
 
-    @property
-    def value(self):
-        list = [['buffer_length', self.buffer_length]]
-        list.append(['buffer_type', self.buffer_type])
-        buffer_repr = [
-            dict([['datetime', buffer_item.datetime],
-             ['value', buffer_item.value]])
-            for buffer_item in self.buffer
-        ]
-        list.append(['buffer', buffer_repr])
-        return dict(list)
-
     def __str__(self):
         output = "\t buffer length: {}\n".format(self.buffer_length)
         output += "\t buffer type: {}".format(self.buffer_type)
@@ -162,3 +183,25 @@ class ProfileGenericObject(DSMRObject):
             output += "\n\t event occured at: {}".format(timestamp)
             output += "\t for: {} [{}]".format(buffer_value.value, buffer_value.unit)
         return output
+
+    def to_json(self):
+        """
+        :return: A json of all values in the GenericProfileObject , with the following structure
+                 {'buffer_length': n,
+                  'buffer_type': obis_ref,
+                  'buffer': [{'datetime': d1,
+                              'value': v1,
+                              'unit': u1},
+                              ...
+                               {'datetime': dn,
+                              'value': vn,
+                              'unit': un}
+                              ]
+                  }
+        """
+        list = [['buffer_length', self.buffer_length]]
+        list.append(['buffer_type', self.buffer_type])
+        buffer_repr = [json.loads(buffer_item.to_json()) for buffer_item in self.buffer]
+        list.append(['buffer', buffer_repr])
+        output = dict(list)
+        return json.dumps(output)

setup.py

@@ -6,7 +6,7 @@ setup(
     author='Nigel Dokter',
     author_email='nigel@nldr.net',
     url='https://github.com/ndokter/dsmr_parser',
-    version='0.20',
+    version='0.21',
     packages=find_packages(),
     install_requires=[
         'pyserial>=3,<4',