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* anders/diameter/info/OTP-13508:
Add diameter:peer_find/1
Add diameter:peer_info/1
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* anders/diameter/overload/OTP-13330:
Suppress dialyzer warning
Remove dead case clause
Let throttling callback send a throttle message
Acknowledge answers to notification pids when throttling
Throttle properly with TLS
Don't ask throttling callback to receive more unless needed
Let a throttling callback answer a received message
Let a throttling callback discard a received message
Let throttling callback return a notification pid
Make throttling callbacks on message reception
Add diameter_tcp option throttle_cb
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To return a peer_fsm/transport pair given one of them.
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To return information about a single peer_ref(), to avoid having to
retrieve more than is needed with service_info/2.
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By sending {diameter, {answer, pid()}} when an incoming answer is sent
to the specified pid, instead of a discard message as previously. The
latter now literally means that the message has been discarded.
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In addition to returning ok or {timeout, Tmo}, let a throttling callback
for message reception return a pid(), which is then notified if the
message in question is either discarded or results in a request process.
Notification is by way of messages of the form
{diameter, discard | {request, pid()}}
where the pid is that of a request process resulting from the received
message. This allows the notification process to keep track of the
maximum number of request processes a peer connection can have given
rise to.
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* anders/diameter/dialyzer/OTP-13400:
Fix dialyzer warnings
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Whether making record declarations unreadable to compensate for
dialyzer's ignorance of match specs is worth it is truly debatable.
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Whether making record declarations unreadable to compensate for
dialyzer's ignorance of match specs is worth it is truly debatable.
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* anders/diameter/retransmission/OTP-13342:
Fix handling of shared peer connections in watchdog state SUSPECT
Remove unnecessary parentheses
Remove dead export
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A peer connection shared from a remote node was regarded as being
available for peer selection (aka up) as long as its peer_fsm process
was alive; that is, for the lifetime of the peer connection. In
particular, it didn't take note of transitions into watchdog state
SUSPECT, when the connection remains. As a result, retransmissions could
select the same peer connection whose watchdog transition caused the
retransmission.
A service process now broadcasts a peer_down event just as it
does a peer_up event.
The fault predates the table rearrangements of commit 8fd4e5f4.
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Not needed as of commit 6c9cbd96.
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The export of diameter_traffic:failover/1 happened with the creation of
the module in commit e49e7acc, but was never needed since the calling
code was also moved into diameter_traffic.
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Each service process maintains a dictionary of peers, mapping an
application alias to a {pid(), #diameter_caps{}} list of connected
peers. These lists are potentially large, peers were appended to the end
of the list for no particular reason, and these long lists were
constructed/deconstructed when filtering them for pick_peer callbacks.
Many simultaneous outgoing request could then slow the VM to a crawl,
with many scheduled processes mired in list manipulation.
The pseudo-dicts are now replaced by plain ets tables. The reason for
them was (once upon a time) to have an interface interchangeable with a
plain dict for debugging purposes, but strict swapablity hasn't been the
case for some time now, and in practice a swap has never taken place.
Additional tables mapping Origin-Host/Realm have also been introduced,
to minimize the size of the peers lists when peers are filtered on
host/realm. For example, a filter like
{any, [{all, [realm, host]}, realm]}
is probably a very common case: preferring a Destination-Realm/Host
match before falling back on Destination-Realm alone. This is now more
efficiently (but not equivalently) expressed as
{first, [{all, [realm, host]}, realm]}
to stop the search when the best match is made, and extracts peers from
host/realm tables instead of searching through the list of all peers
supporting the application in question. The code to try and start with a
lookup isn't exhaustive, and the 'any' filter is still as inefficient as
previously.
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See commit 862af31d.
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Each service process maintains a dictionary of peers, mapping an
application alias to a {pid(), #diameter_caps{}} list of connected
peers. These lists are potentially large, peers were appended to the end
of the list for no particular reason, and these long lists were
constructed/deconstructed when filtering them for pick_peer callbacks.
Many simultaneous outgoing request could then slow the VM to a crawl,
with many scheduled processes mired in list manipulation.
The pseudo-dicts are now replaced by plain ets tables. The reason for
them was (once upon a time) to have an interface interchangeable with a
plain dict for debugging purposes, but strict swapablity hasn't been the
case for some time now, and in practice a swap has never taken place.
Additional tables mapping Origin-Host/Realm have also been introduced,
to minimize the size of the peers lists when peers are filtered on
host/realm. For example, a filter like
{any, [{all, [realm, host]}, realm]}
is probably a very common case: preferring a Destination-Realm/Host
match before falling back on Destination-Realm alone. This is now more
efficiently (but not equivalently) expressed as
{first, [{all, [realm, host]}, realm]}
to stop the search when the best match is made, and extracts peers from
host/realm tables instead of searching through the list of all peers
supporting the application in question. The code to try and start with a
lookup isn't exhaustive, and the 'any' filter is still as inefficient as
previously.
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See commit 862af31d.
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* anders/diameter/17.5.6.7/OTP-13211:
vsn -> 1.9.2.2
Update/fix appup for 17.5.6.7
Be resilient to diameter_service state upgrades
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* anders/diameter/request_leak/OTP-13137:
Fix request table leak at retransmission
Fix request table leak at exit signal
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By not failing in code that looks up state: pick_peer and service_info.
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* anders/diameter/request_leak/OTP-13137:
Fix request table leak at retransmission
Fix request table leak at exit signal
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In the case of retranmission, a prepare_retransmit callback could modify
End-to-End and/or Hop-by-Hop identifiers so that the resulting
diameter_request entry was not removed, since the removal was of entries
with the identifiers of the original request. The chances someone doing
this in practice are probably minimal.
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The storing of request records in the ets table diameter_request was
wrapped in a try/after so that the latter would unconditionally remove
written entries. The problem is that it didn't deal with the process
exiting as a result of an exit signal, since this doesn't raise in an
exception. Since the process in question applies callbacks to user code,
we can potentially be linked to other process and exit as a result.
Trapping exits changes the current behaviour of the process, so spawn a
monitoring process that cleans up upon reception of 'DOWN'.
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Record field types have been modified due to commit 8ce35b2:
"Take out automatic insertion of 'undefined' from typed record fields".
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* anders/diameter/watchdog/OTP-12969:
Fix watchdog function_clause
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* anders/diameter/M-bit/OTP-12947:
Add service_opt() strict_mbit
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Commit 4f365c07 introduced the error on set_watchdog/2, as a consequence
of timeout/1 returning stop, which only happens with accepting
transports with {restrict_connections, false}.
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Commit 4f365c07 introduced the error on set_watchdog/2, as a consequence
of timeout/1 returning stop, which only happens with accepting
transports with {restrict_connections, false}.
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There are differing opinions on whether or not reception of an arbitrary
AVP setting the M-bit is an error. 1.3.4 of RFC 6733 says this about
how an existing Diameter application may be modified:
o The M-bit allows the sender to indicate to the receiver whether or
not understanding the semantics of an AVP and its content is
mandatory. If the M-bit is set by the sender and the receiver
does not understand the AVP or the values carried within that AVP,
then a failure is generated (see Section 7).
It is the decision of the protocol designer when to develop a new
Diameter application rather than extending Diameter in other ways.
However, a new Diameter application MUST be created when one or more
of the following criteria are met:
M-bit Setting
An AVP with the M-bit in the MUST column of the AVP flag table is
added to an existing Command/Application. An AVP with the M-bit
in the MAY column of the AVP flag table is added to an existing
Command/Application.
The point here is presumably interoperability: that the command grammar
should specify explicitly what mandatory AVPs much be understood, and
that anything more is an error.
On the other hand, 3.2 says thus about command grammars:
avp-name = avp-spec / "AVP"
; The string "AVP" stands for *any* arbitrary AVP
; Name, not otherwise listed in that Command Code
; definition. The inclusion of this string
; is recommended for all CCFs to allow for
; extensibility.
This renders 1.3.4 pointless unless "*any* AVP" is qualified by "not
setting the M-bit", since the sender can effectively violate 1.3.4
without this necessitating an error at the receiver. If clients add
arbitrary AVPs setting the M-bit then request handling becomes more
implementation-dependent.
The current interpretation in diameter is strict: if a command grammar
doesn't explicitly allow an AVP setting the M-bit then reception of such
an AVP is regarded as an error. The strict_mbit option now allows this
behaviour to be changed, false turning all responsibility for the M-bit
over to the user.
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The diffs are all about adapting to the OTP 18 time interface. The code
was previously backwards compatible, falling back on the erlang:now/0 if
erlang:monotonic_time/0 is unavailable, but this was seen to be a bad
thing in commit 9c0f2f2c. Use of erlang:now/0 is now removed.
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* anders/diameter/17/time/OTP-12926:
Simplify time manipulation
Remove use of monotonic time in pre-18 code
Remove unnecessary redefinition of erlang:max/2
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* anders/diameter/grouped_errors/OTP-12930:
Fix decode of Grouped AVPs containing errors
Simplify logic
Simplify logic
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* anders/diameter/transport/OTP-12929:
Fix start order of alternate transports
Log discarded answers
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* anders/diameter/lcnt/OTP-12912:
Make ets diameter_stats a set
Remove unnecessary sorting in stats suite
Set ets {write_concurrency, true} on diameter_stats
Don't start watchdog timers unnecessarily
Remove unnecessary erlang:monitor/2 qualification
Add missing watchdog suite clause
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* anders/diameter/caseless/OTP-12902:
Match allowable peer addresses case insensitively
Replace calls to module inet_parse to equivalents in inet
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* anders/diameter/grouped_decode/OTP-12879:
Fix relay encode of decoded diameter_avp lists
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There's no need for it to be ordered, and the ordering has been seen to
have an unexpectedly negative impact on performance in some cases. Order
when retrieving statistics instead, so as not to change the
presentation in diameter:service_info/2.
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By doing away with more wrapping that the parent commit started to
remove.
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This has been seen to be a bottleneck at high load: each undef results
in a loop out to the code server.
Originally implemented as suggested in the erts user's guide, in commits
e6d19a18 and d4386254.
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A transport configured with diameter:add_transport/2 can be passed
multiple transport_module/transport_config tuples in order to specify
alternate configuration, modules being attempted in order until one
succeeds. This is primarily for the connecting case, to allow a
transport to be configured to first attempt connection over SCTP, and
then TCP in case SCTP fails, with configuration like that documented:
{transport_module, diameter_sctp},
{transport_config, [...], 5000},
{transport_module, diameter_tcp},
{transport_config, [...]}
If the options are the same in both cases, another possibility would be
configuration like this, which attaches the same transport_config to
both modules:
{transport_module, diameter_sctp},
{transport_module, diameter_tcp},
{transport_config, [...], 5000},
However, in this case the start order was reversed relative to the
documented order: first tcp, then sctp. This commit restores the
intended order.
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To diameter_lib:log/4, which was last motivated in commit 39acfdb0.
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Commit c74b593a fixed the problem that a decoded deep diameter_avp list
couldn't be encoded, but did so in the wrong way: there's no need to
reencode component AVPs since the Grouped AVP itself already contains
the encoded binary. The blunder caused diameter_codec:pack_avp/1 to fail
if the first element of the AVP list to be encoded was itself a list.
Thanks to Andrzej Trawiński for reporting the problem.
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Both diameter_tcp and diameter_sctp can be configured with one or more
IP addresses from which connections should be accepted (an 'accept'
tuple), specified either as a tuple-valued address or as a regular
expression. In the latter case, peer addresses are mapped to string
using inet:ntoa/1 and the result matched against the regexp. Since
(ipv6) addresses are case insensitive, this should also be the case with
the match, but was not.
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Commits b563c796 (R16B) and 0fad6449 (R16B02) added parse_address/1 and
ntoa/1 to module inet, providing documented alternatives to address/1
and ntoa/1 in the undocumented (save comments in inet(3)) inet_parse.
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