[getdns-api] API review - working with dicts,lists, and bindata

[Goyal, Neel]

This is commentary on sections 3.1.3 and 3.2 related to dicts/lists/bindata in reference to Bob Steagall’s review of the getdns API - http://www.vpnc.org/pipermail/getdns-api/2014-January/000229.html


Bob proposes a rename of functions related to dictionary and list element accessors.  A small sample includes:

getdns_list_create => getdns_create_list
getdns_list_set_dict => getdns_set_list_element_as_dict
getdns_list_get_dict => getdns_get_list_element_as_dict

getdns_dict_set_list => getdns_set_dict_element_as_list

I like the proposed name changes as it makes it clearer what is happening to the datastructure being modified.  It also feels more readable to me.

Section 3.2 proposes adding a couple of helpers for working with bindatas.  Specifically something like:

getdns_set_list_element_as_bindata_2
(
 getdns_list_t this_list,
 size_t index,
 uint8_t* bindata_content,
 size_t bindata_size
);

I like the thought and have no problem including them in the core (though I dislike the _2 suffix).  This relates to the discussion in http://www.vpnc.org/pipermail/getdns-api/2014-January/000219.html - it is possible that we can create a utility library that operates on top of the getdns spec and exposes some of these entry points for the user without affecting the core, and then gradually bring them in as needed.

That said, these functions are trivial for us to implement in the core right now, so maybe it is worth pulling them in.

Thoughts?

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