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RFC 6733 says that certain 5xxx result codes must be accompanied by
Failed-AVP, and decode populates #diameter_packet.errors with
Result-Code/AVP pairs for errors it detects. However, Failed-AVP was not
set in the outgoing answer if the handle_request callback returned
{answer_message, 5xxx}. It is now set with the AVP from the first pair
with the specified Result-Code, if found.
Note that {answer_message, 5xxx} doesn't handle all cases in which a
5xxx answer is required, only that in which the setting above is
appropriate. If it isn't then handle_request should construct its answer
and return {reply, Ans}.
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Allow both share_peers and use_shared_peers to be a list of nodes, or a
function that returns a list of nodes.
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RFC 3588 allowed only 3xxx result codes in an answer-message (that is,
an answer that sets the E-bit) while RFC 6733 also allows 5xxx result
codes. Setting request_errors = answer tells diameter to answer 5xxx
errors itself. Returning {answer_message, integer()} from a
handle_request callback allows both 3xxx and 5xxx result codes to be
set. {protocol_error, integer()} is retained for 3xxx result codes.
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When receiving a request for which errors have been detected during
decode, diameter previously used the errors list in the decoded
diameter_packet record to unconditionally set Result-Code and Failed-AVP
in the outgoing answer. It wasn't particularly delicate in doing so
however and would happily set a 5xxx Result-Code even if a
handle_request callback returned an answer-message, leading to an encode
error. This behaviour became even less endearing as of commit ac452e28,
which made it possible to handle_request to take place even for protocol
errors. (ie. When a callback typically should return an answer-message.)
This commit fixes the behaviour by only setting a value that's
appropriate for the answer in question, either a 3xxx or a 5xxx,
depending on if the answer's an answer-message or not. It also allows
handle_request to prevent diameter from setting anything by setting
errors = false in a returned diameter_packet. Ideally it should have
been errors = [] but the empty list is the default value for the errors
field and changing the default (ideally there shouldn't have been one)
would require recompilation of all modules including diameter.hrl:
choose the less attractive 'false' to avoid such backwards
incompatibility.
The request reception is also refactored somewhat to shorten some call
chains.
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The former doesn't allow seealso content, which erl_docgen doesn't
enforce, resulting in mangled PDF.
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This allows it to set transport_data and header, inappropriately so
even.
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Broken in commit e28ced7b.
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Diameter node/peer having been the most vicious terminology blunder.
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* anders/diameter/relay_behaviour/OTP-9583:
Fix and clarify relay behaviour
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Leave it up to a handle_request callback to decide whether or
not to filter the peer from which the incoming request was sent.
Reply with 3002 (DIAMETER_UNABLE_TO_DELIVER) on anything but an
answer from the peer.
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An eval filter returning a non-true value caused the call process
to fail and the doc was vague on how an exception was treated.
Clarify that the non-tuple host/realm filters assume messages of
a certain form. Various minor corrections to align code and doc.
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Added an introductory chapter to the User's Guide as well as more
detailed release notes.
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The application provides an implementation of the Diameter protocol
as defined in RFC 3588.
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