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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The documentation has been out of date since the string_decode option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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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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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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Message length errors in incoming messages were misinterpreted with
transport_opt() {length_errors, exit} due to the throw introduced in
commit 2ffb288: the corresponding catch in incoming/2 caught errors
thrown by close/1, leading to failure when the error reason was
interpreted as a diameter_packet record. Do away with the throw, that
also caused woe in the parent commit.
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A transport process can request acknowledgement of the fate of an
incoming message to a specified pid, causing it to receive one of
{diameter, {request|answer, pid()} | discard}
depending on whether or not diameter passes the message off to a handler
process. This was broken in commit a4da06a5 (since recv/3 threw a
message that should be received), but is of little consequence since the
interface isn't yet documented and is only used from diameter_tcp with
configuration that will soon change.
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From commits 5ca5fb71 and 58091992.
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* anders/diameter/capx_strictness/OTP-14257:
Add transport_opt() capx_strictness
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To allow the Peer State Machine requirement that only the expected
capabilities exchange message be received in the relevant state to be
relaxed. If {capx_strictness, false} is configured then anything bu the
expected CER/CEA is ignored.
This is non-standard behaviour, and thusfar undocumented. Use at your
own risk.
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When relaying outgoing requests through transport on a remote node,
terms that were stripped when sending to the transport process weren't
stripped when spawning a process on the remote node.
Also, don't save the request to the process dictionary in a process that
just relays an answer.
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The table has existed forever, to route incoming answers to a waiting
request process: each outgoing request writes to the table, and each
incoming answer reads. This has been seen to suffer from lock contention
at high load however, so this commit moves the routing into the
diameter_peer_fsm processes that are diameter's conduit to transport
processes. The request table is still used for failover detection, but
entries are only written when a watchdog state transitions leaves or
enters state OKAY.
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Commit 9a878743 addressed inefficiency at failover, but introduced
inefficiency in the sending of outgoing requests in so doing: each
outgoing request added an request table entry keyed on a transport pid,
then looked for a specific element with this key, and then (later)
removed the inserted element. Since the request table is a bag, this
results in linear searches over a potentially long list of element
keyed on the same pid. The higher the rate of outgoing calls, the more
costly it becomes.
Instead of writing entries to the request table, the peer_up/down calls
to diameter_traffic that mirror transitions to and from the OKAY state
in the RFC 3539 watchdog state machine now result in a process for
request processes to monitor in order to detect failover.
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* anders/diameter/19.1/OTP-13838:
vsn -> 1.12.1
Update appup for 19.1
Fix xmllint errors in documentation
Remove documentation overkill
Don't run traffic tests in parallel when {string_decode, true}
Remove copyright from generated dictionary modules
Fix dictionary function typo
Fix dictionary typo in relay example
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* anders/diameter/failover/OTP-13412:
Make peer failover more efficient
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The setting in all diameter server processes has existed since the
beginning of time. Whether it's actually useful is questionable, but it
does lead to increased memory usage, especially if there are many peer
connections whose processes wouldn't otherwise be large. Let the setting
be disabled with -diameter min_heap_size false. (Or any value that isn't
a non-negative integer.)
The diameter application itself only calls
diameter_lib:spawn_opts(server, []), but let other arguments remain for
backwards compatibility, since diameter_lib:spawn_opts/2 has been abused
from outside of diameter.
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It's '#get-'/2, not 'get-'/2. Only failed if the dictionary in question
defined no Failed-AVP, which is rarely the case in practice.
Thanks to Ferenc Holzhauser.
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* anders/diameter/rand/OTP-13664:
Use rand(3) instead of random(3)
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The latter is deprecated in OTP 19.
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