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To remove the requirement that dictionary modules be recompiled whenever
the encode/decode implementation changes. The included diameter_gen.hrl
now only contains trivial functions that call info diameter_gen.erl.
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To pass the options map through the encode. This is not backwards
compatible, and dictionaries supporting @custom_types or @codecs will
need to be updated.
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As in commit fb14eac9, but for outgoing answers.
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To simplify the call chains and intermediate terms, that had become a
little convoluted over time.
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The documentation has been out of date since the string_decode option
was added in commit 1590920c. The optionless decode/2 was removed in the
commit that removed the use of the process dictionary in decode.
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To allow list-valued messaged to be encoded in the specified order,
instead of in the dictionary order by first converting the list to a
record. This is not yet exposed in configuration.
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The parent commit removed the convenience of setting something like the
following in the errors field of the diameter_packet of an answer
message.
[#diameter_avp{} = A2, {5001, #diameter_avp{} = A1}]
This results in Result-Code = 5001 and Failed-AVP = [A1,A2], but is
currently undocumented. Probably useful, so restore it.
Also accept {RC, [#diameter_avp{}]} at encode, which is probably more
useful; eg. [{5001, [A || {5001, A} <- Errors]}]
Anyone who wants full control can set errors = false and formulate
Result-Code/Failed-AVP themselves. (As opposed to not setting a value
explicitly, which results in setting from the decoded errors list. A bit
quirky, but documented and historical.)
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When setting the Result-Code/Failed-AVP of an outgoing answer from an
errors list either returned from or not discarded by a handle_request
callback, more than the AVP paired with the Result-Code in question
could be set in Failed-AVP.
RFC 6733:
7.5. Failed-AVP AVP
The Failed-AVP AVP (AVP Code 279) is of type Grouped and provides
debugging information in cases where a request is rejected or not
fully processed due to erroneous information in a specific AVP. The
value of the Result-Code AVP will provide information on the reason
for the Failed-AVP AVP. A Diameter answer message SHOULD contain an
instance of the Failed-AVP AVP that corresponds to the error
indicated by the Result-Code AVP. For practical purposes, this
Failed-AVP would typically refer to the first AVP processing error
that a Diameter node encounters.
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In this case the diameter_packet of an answer message for encode. The
record itself could be avoided, but that requires a new interface in
diameter_codec, probably for little gain.
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In the theme of the previous two commits, creating the required
diameter_header of diameter_packet record only once.
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As in the parent commit, recreating the options record is relatively
costly.
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This old construction is approximately two to four times slower from
best (no elements modified) to worst (all modified) case, with the new
construction having constant speed.
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Replace old macro-based implementation with something more readable.
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The tuple is returned from and passed to callbacks, so retain the tuple
instead of its elements.
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By passing additional arguments through it.
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Folded when I should have mapped.
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This and subsequent commits are destined for OTP 20.0.
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Since value is ignored.
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Which is the equivalent of what was done with '#new-'/1 and '#set-'/2.
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base/diameter_codec.erl:716: Warning: OPTIMIZED: creation of sub binary delayed
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base/diameter_codec.erl:545: Warning: OPTIMIZED: creation of sub binary delayed
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base/diameter_codec.erl:600: Warning: OPTIMIZED: creation of sub binary delayed
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Dict:avp(encode, Value, Name) no longer needs to return a binary, only
an iolist(). Message encode runs list_to_binary/1 to convert accumulated
lists into a message binary.
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This is a special case to allow encode of something other than an
iolist.
Eg. #diameter_avp{data = {diameter_gen_base_rfc6733,
'Proxy-Info',
[{'Proxy-Host', "HOST"}, {'Proxy-State', "STATE"}]}}
Only worked as expected for AVPs of type other than Grouped.
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On the same theme as the parent commit, building binaries in fewer
steps.
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Prepend the header in a single step.
Before:
{[{{diameter_codec,pack_avp,1}, 7000, 126.074, 51.058}],
{ {diameter_codec,pack_avp,2}, 7000, 126.074, 51.058}, %
[{{diameter_codec,pack_avp,5}, 7000, 51.144, 25.758},
{{diameter_codec,pad,2}, 7000, 23.844, 23.570},
{suspend, 1, 0.028, 0.000}]}.
After:
{[{{diameter_codec,pack_avp,1}, 7000, 78.563, 26.986}],
{ {diameter_codec,pack_avp,2}, 7000, 78.563, 26.986}, %
[{{diameter_codec,pack_avp,6}, 7000, 51.459, 26.381},
{suspend, 4, 0.118, 0.000}]}.
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Instead of the slower sets. Bump application dependencies to 17.5, even
though earlier versions may do fine.
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Profiling with fprof showed this prior to this commit:
{[{{diameter_codec,decode,3}, 1000, 231.122, 4.092},
{{diameter_codec,collect_avps,1}, 1000, 0.000, 3.929}],
{ {diameter_codec,collect_avps,1}, 2000, 231.122, 8.021}, %
[{{diameter_codec,collect_avps,3}, 1000, 222.932, 11.644},
{garbage_collect, 19, 0.169, 0.169},
{{diameter_codec,collect_avps,1}, 1000, 0.000, 3.929}]}.
{[{{diameter_codec,collect_avps,1}, 1000, 222.932, 11.644},
{{diameter_codec,collect_avps,3}, 7000, 0.000, 68.186}],
{ {diameter_codec,collect_avps,3}, 8000, 222.932, 79.830}, %
[{{diameter_codec,split_avp,1}, 7000, 120.886, 72.382},
{{erlang,setelement,3}, 7000, 21.830, 21.830},
{garbage_collect, 48, 0.386, 0.386},
{{diameter_codec,collect_avps,3}, 7000, 0.000, 68.186}]}.
Note the time consumed in split_avp/1 and erlang:setelement/3. This
commit does more matching in one go, without intermediate results,
giving this:
{[{{diameter_codec,decode,3}, 1000, 42.512, 3.701},
{{diameter_codec,collect_avps,1}, 1000, 0.000, 3.594}],
{ {diameter_codec,collect_avps,1}, 2000, 42.512, 7.295}, %
[{{diameter_codec,collect_avps,3}, 1000, 35.217, 4.577},
{{diameter_codec,collect_avps,1}, 1000, 0.000, 3.594}]}.
{[{{diameter_codec,collect_avps,1}, 1000, 35.217, 4.577},
{{diameter_codec,collect_avps,3}, 7000, 0.000, 27.754}],
{ {diameter_codec,collect_avps,3}, 8000, 35.217, 32.331}, %
[{garbage_collect, 262, 2.647, 2.647},
{suspend, 9, 0.239, 0.000},
{{diameter_codec,collect_avps,3}, 7000, 0.000, 27.754}]}.
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Don't call a function when we know the result, and consistently return a
binary.
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To determine the wrapping of messages passed to recv callbacks and into
diameter. The default passing of the input stream in transport_data is
probably of no practical use, but has been set since time immemorial.
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Corresponding to diameter_tcp callbacks a few commits back. Exercise the
callbacks in the traffic suite.
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To let a recv callback for an incoming request set transport_data and
have it returned in a send callback.
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From the receiver process, that can return binaries to send/receive and
stop the transport process from reading on the socket.
This is still undocumented, and may change.
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With sends still from the receiving process by default, since changing
the default behaviour may well have negative effects. A separate sender
probably implies a greater need for some form of load regulation for
one, since a blocking send would no longer imply that incoming messages
are no longer recevied. Dealing with this could result in the same
deadlock that the sending process intends to avoid, but the user should
be in control over how/when incoming traffic is regulated.
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Added in commit 2afd1fe5. Only rename variables in diameter_tcp, no
functional change.
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This:
diameter_tcp.erl:241: Record construction #transport{parent::'false',ssl::boolean() | maybe_improper_list(),frag::<<>>,tref::'false',flush::'false',pending::0,reset::{1 | 4,0 | 2},throttled::boolean(),q::{0,queue:queue(_)},monitor::'undefined' | pid()} violates the declared type of field parent::pid()
The problem isn't #transport.pid at all, it's #monitor.pid, and the only
relation is that the pid that's assigned to the latter is also (later)
assigned to the former. There is no record construction that assigns
false to #transport.parent.
Introduced in commit 33a535e4.
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What's interesting when implementing some form of load regulation is
when an incoming request has been answered or discarded. Acknowledge
exactly this, not the identity of handler processes as previously. A
transport process can request acks of nonforthcoming answers by sending
{diameter, ack} to the parent peer_fsm, a handler processes identifies
itself with a {handler, pid()} message, and the peer_fsm monitors on
this to be able to send a notification to the transport if the handler
dies before sending an answer.
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Commits starting at 472a080c added a throttle_cb option to diameter_tcp
to let a callback apply backpressure when it decides that additional
requests should not be read. It didn't provide a hook for knowing that
an answer was sent however, which is needed when sends no longer take
place in the receiver process, and is more complicated than it should
be. Strip it all away, in preparation for a simpler incarnation.
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Shutdown events have been seen to get a different association id.
For example, first incoming message with association id = 0:
+ {trace_ts,<6421.268.0>,call,
{diameter_sctp,handle_info,
[{sctp,#Port<6421.2588>,
{10,67,16,179},
44159,
{[{sctp_sndrcvinfo,0,0,[],0,0,0,269950872,269950872,0}],
<<1,0,0,156,128,0,1,1,0,0,0,0,6,193,40,137,6,193,40,137,0,0,
1,8,64,0,0,30,67,45,49,51,52,50,49,55,52,52,49,46,101,114,
108,97,110,103,46,111,114,103,0,0,0,0,1,40,64,0,0,18,101,
114,108,97,110,103,46,111,114,103,0,0,0,0,1,1,64,0,0,14,0,
1,127,0,0,1,0,0,0,0,1,10,64,0,0,12,0,0,48,57,0,0,1,13,0,0,
0,20,79,84,80,47,100,105,97,109,101,116,101,114,0,0,1,22,
64,0,0,12,0,0,0,1,0,0,1,2,64,0,0,12,0,0,0,0,0,0,1,3,64,0,0,
12,0,0,0,3>>}},
{transport,<6421.252.0>,accept,#Port<6421.2588>,true,undefined,
{32,32},
0,undefined}]},
{1493,21505,577938}}
Later, a shutdown event with association id 1536:
+ {trace_ts,<6421.268.0>,call,
{diameter_sctp,handle_info,
[{sctp,#Port<6421.2588>,
{10,67,16,179},
44159,
{[],{sctp_shutdown_event,1536}}},
{transport,<6421.252.0>,accept,#Port<6421.2588>,0,undefined,
{32,32},
2,<6421.304.0>}]},
{1493,21505,746929}}
Both this and the grandparent commit are on this:
$ uname -a
SunOS beren 5.10 Generic_118833-33 sun4v sparc SUNW,Netra-T2000
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In particular, that the association id received in messages on a
one-to-one socket after peeloff may be different from the id received on
the listen socket at comm_up.
This seems odd, since it's then not possible to send until the id is
discovered by reception of an SCTP message containing it, but it's
unclear if this is a bug or a feature, or if it's specific to certain
platforms. Treat it as a feature in this commit, and get the association
id as mentioned, an incoming CER being expected before anything is sent.
Commit da3e5d67 has more history.
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