[PROTON-1067] python messenger: cannot acknowledge messages, messenger forces auto-ack or pre-settled.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: proton-0.11.0
• Fix Version/s: proton-0.12.0
• Component/s: python-binding
• Assignee: Alan Conway
• Reporter: Alan Conway
• Created: 26/Nov/15 16:16
• Updated: 16/Feb/16 14:57
• Resolved: 14/Dec/15 17:20

Description

In order to manually acknowledge received messages messenger requires you to:

1. set "incoming_window" > 0, otherwise messenger auto-settles all messages.
2. set "snd_settled_mode" to SND_UNSETTLED so that the remote end does not pre-settle messages.

However the python binding (and I think all the bindings) for messenger do not allow you to call pn_messenger_set_snd_settled_mode, which defaults to SND_SETTLED. Thus it is impossible to manually accept messages because either (with incoming_window==0) messenger auto-settles them or (with incoming_window > 0) messenger's subscribe requests SND_SETTLED on the incoming link so the other end sends pre-settled messages.