Example on incremental channel update (#204)

Author: Sebastian Molenda

examples/native_sync/channel_object.py

@@ -0,0 +1,77 @@
+from pprint import pprint
+from pubnub.pubnub import PubNub
+from pubnub.pnconfiguration import PNConfiguration
+
+config = PNConfiguration()
+config.publish_key = 'demo'
+config.subscribe_key = 'demo'
+config.user_id = 'example'
+
+channel = "demo_example"
+help_string = "\tTo exit type '/exit'\n\tTo show the current object type '/show'\n\tTo show this help type '/help'\n"
+
+pubnub = PubNub(config)
+
+print(f"We're setting the channel's {channel} additional info. \n{help_string}\n")
+
+name = input("Enter the channel name: ")
+description = input("Enter the channel description: ")
+
+# Setting the basic channel info
+set_result = pubnub.set_channel_metadata(
+    channel,
+    name=name,
+    description=description,
+).sync()
+print("The channel has been created with name and description.\n")
+
+# We start to iterate over the custom fields
+while True:
+    # First we have to get the current object to know what fields are already set
+    current_object = pubnub.get_channel_metadata(
+        channel,
+        include_custom=True,
+        include_status=True,
+        include_type=True
+    ).sync()
+
+    # Gathering new data
+    field_name = input("Enter the field name: ")
+    if field_name == '/exit':
+        break
+    if field_name == '/show':
+        pprint(current_object.result.data, indent=2)
+        print()
+        continue
+    if field_name == '/help':
+        print(help_string, end="\n\n")
+        continue
+
+    field_value = input("Enter the field value: ")
+
+    # We may have to initialize the custom field
+    custom = current_object.result.data.get('custom', {})
+    if custom is None:
+        custom = {}
+
+    # We have to check if the field already exists and
+    if custom.get(field_name):
+        confirm = input(f"Field {field_name} already has a value. Overwrite? (y/n):").lower()
+        while confirm not in ['y', 'n']:
+            confirm = input("Please enter 'y' or 'n': ").lower()
+        if confirm == 'n':
+            print("Object will not be updated.\n")
+            continue
+        if confirm == 'y':
+            custom[field_name] = field_value
+    else:
+        custom[field_name] = field_value
+
+    # Writing the updated object back to the server
+    set_result = pubnub.set_channel_metadata(
+        channel,
+        custom=custom,
+        name=current_object.result.data.get('name'),
+        description=current_object.result.data.get('description')
+    ).sync()
+    print("Object has been updated.\n")