Daan De Meyer
c0696f1f5d
Streaming methods which are not used as a continuous subscription but instead only send a series of objects all end up with the same workaround to be able to figure out when to send sd_varlink_reply() or sd_varlink_notify(). Let's generalize this in sd-varlink itself. Let's introduce the concept of a sentinel, which is a reply that will be sent by sd-varlink if no other reply was queued by a method callback. The sentinel is configured with varlink_set_sentinel(). If a sentinel is configured, sd_varlink_reply() can be used more than once in streaming methods to queue multiple values to stream to the client. The last queued reply is not sent until the callback finishes. When the callback finishes, the last reply is sent without "continues: more". If no reply was queued, the sentinel is sent. This always using only sd_varlink_reply() in such streaming methods and leaves sd_varlink_notify() available solely for continuous subscription streaming methods, where we never use sd_varlink_reply() and instead disconnect when the server exits.
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