provides.py

class HttpProvides(Endpoint):

    @when('endpoint.{endpoint_name}.joined')
    def joined(self):
        set_flag(self.expand_name('{endpoint_name}.available'))

    @when_not('endpoint.{endpoint_name}.joined')
    def broken(self):
        clear_flag(self.expand_name('{endpoint_name}.available'))

    def configure(self, host, port, services=None):
        ctxt = {'host': host, 'port': port}
        if services:
            ctxt['services'] = services
        for relation in self.relations:
            relation.to_publish_raw.update(ctxt)