Message Validation

[richteer]

Somewhere there should be some kind of message validator, something that ensures that a message object is properly formed. Some protocols might be stricter on what is a valid body, so should there be some kind of universal support for checking valid input?

Example implementation: add a check(msg) method to the HalAgent class. Implemention the latter as such:

class HalAgent(HalObject):
  ...
  def check(self, msg):
    return True
  ...
  def receive(self, msg):
    if self.check(msg):
      self._queue.add(msg)
      return True:
    return False
  ...

An agent implementer could then override the .check(msg) method to give it some kind of validity checking logic, if the protocol is picky. This means, scanning for UTF-8 strings, or looking for missing values that are expected.

There should also be a implicit "valid_check" option in agent configs, where these checks either fail, throw a warning, or completely skip the check.