pulsar-functions/python-examples/config_based_append_function.py

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from pulsar import Function

# Function that appends something to incoming input based on config supplied
class ConfigBasedAppendFunction(Function):
  def __init__(self):
    pass

  def process(self, input, context):
    key = "config-key"
    append_value = "!"
    if key in context.get_user_config_map():
      append_value = context.get_user_config_value(key)
    return input + str(append_value)