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Transport processes are started by diameter one at a time. In the
listening case, a transport process accepts a connection, tells the
peer_fsm process, which tells its watchdog process, which tells its
service process, which then starts a new watchdog, which starts a new
peer_fsm, which starts a new transport process, which (finally) goes
about accepting another connection. In other words, not particularly
aggressive in accepting new connections. This behaviour doesn't do
particularly well with a large number of concurrent connections: with
TCP and 250 connecting peers we see connections being refused.
This commit adds the possibilty of configuring a pool of accepting
processes, by way of a new transport option, pool_size. Instead of
diameter:add_transport/2 starting just a single process, it now starts
the configured number, so that instead of a single process waiting for a
connection there's now a pool.
The option is even available for connecting processes, which provides an
alternate to adding multiple transports when multiple connections to the
same peer are required. In practice this also means configuring
{restrict_connections, false}: this is not implicit.
For backwards compatibility, the form of
diameter:service_info(_,transport) differs in the connecting case,
depending on whether or not pool_size is configured.
Note that transport processes for the same transport_ref() can be
started concurrently when pool_size > 1. This places additional
requirements on diameter_{tcp,sctp}, that will be dealt with in a
subsequent commit.
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The order of peers presented to a diameter_app(3) pick_peer callback has
previously not been documented, but there are use cases that are
simplified by an ordering. For example, consider preferring a direct
connection to a specified Destination-Host/Realm to any host in the
realm. The implementation previously treated this as a special case by
placing matching hosts at the head of the peers list, but the
documentation made no guarantees. Now present peers in match-order, so
that the desired sorting is the result of the following filter.
{any, [{all, [host, realm]}, realm]}
The implementation is not backwards compatible in the sense that a realm
filter alone is no longer equivalent in this case. However, as stated,
the documentation never made any guarantees regarding the sorting.
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That dictionaries need to be recompiled, which is the case whenever
diameter_gen.hrl is modified.
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* anders/diameter/17.1/OTP-11943:
Update appup for OTP-11946, OTP-11936: 5014, Failed-AVP decode
Update appup for OTP-11938: terminate watchdog after DPR reception
Update appup for OTP-11721: log and counter hardening
Update appup for OTP-11937: counters
Update appup for OTP-11901: diameter_sctp function_clause
Update appup for OTP-11934: watchdog process leak
Update appup for OTP-11893: request table leak
Update appup for OTP-11891: result code counters for CEA/DWA/DPA
vsn -> 1.7
Fix broken release note for diameter-1.4.4
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Those were bug fixes, not known issues.
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In the same vein as commit 00584303, to avoid logging traffic-related
happenings.
Not that the value in diameter.hrl is just documentation: the value is
set explicitly when diameter:start_service/2 creates diameter_app
records.
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* anders/diameter/17.0_release/OTP-11605:
Move info modules into own subdirectory
Include compiler and info modules in app file
Remove unused diameter_dbg:log/4
Remove case expecting a pre-R16B return value from os:type/1
Fix doc typo: required -> requires
Remove release note unrelated to functionality
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* anders/diameter/doc/OTP-11583:
Correct doc on the setting of Origin-State-Id
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It was incorrectly stated that the AVP would be set in an outgoing
DPR/DPA.
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* anders/diameter/sctp_streams/OTP-11593:
Change interface for communicating outbound stream id to diameter_sctp
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* anders/diameter/undefined_group/OTP-11561:
Ensure that Grouped AVP's are fully defined in dictionaries
Don't format diameter_make:codec/2 errors
Compiler suite fix
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The module uses the transport_data field of record diameter_packet to
communicate the stream on which the an incoming message is received and
on which an outgoing message should be sent, the previous interface
being that both are communicated as a tuple of the form {stream, Id}.
However, since diameter retains the value of an incoming request's
transport_data unless the corresponding answer message specifies
otherwise, the behaviour in this case is to send an answer on the
outbound stream with the same identifier as the that of the inbound
stream on which the request was received. If the inbound stream id is
greater than or equal to the number of outbound streams then this is
guaranteed to fail, causing the transport process in question to
terminate. There is no relationship between inbound and outbound stream
identifiers so diameter_sctp's imposition of one is simply wrong.
Outbound stream ids are now communicated with a different tuple:
{outstream, Id}, interpreted modulo the number of outbound streams.
Thus, retention of an inbound request's transport_data has no effect on
the selection of an outbound stream.
The change in interface is not strictly backwards compatible because of
the new atom for the outbound stream. However, as there is currently no
documented way of obtaining the available number of outbound streams for
a peer connection, there is no way for a client to have known the range
of ids from which it could reliably have chosen with the previous
interface, so any setting of the outbound stream has probably been
unintentional. Not explicitly specifying an outbound stream now results
in a round-robin selection.
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Instead, add diameter_make:format_error/1 to allow the caller to format
if desired, which is what applications like compiler and yecc do. Use
this to check that the expected error is the one actually generated in
the compiler suite.
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The R16B03 release
Conflicts:
lib/sasl/vsn.mk
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* anders/diameter/R16B03_release/OTP-11499:
vsn -> 1.5
Update appup for OTP-11168
Update appup for OTP-11361
Add makefile to build example dictionaries
Add recent Diameter-related RFCs
Generate diameterc.1, not diameter_compile.1
Fix documentation typos
Fix appup blunder
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* anders/diameter/timer_confusion/OTP-11168:
Rename reconnect_timer -> connect_timer
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* anders/diameter/dictionary_make/OTP-11348:
Return compilable forms instead of beam
Document diameter_make:format/1 and diameter_make:flatten/1
Fix diameter_make:flatten/1
Modify type that currently causes dialyzer woe
Simplify and extend diameter_make interface
Add diameter_make:flatten/1, remove reformat/1
Adapt compiler suite to diameter_make
Remove dead code from codec suite
Extend diameter_make:codec/2
Don't pollute process dictionary in diameter_codegen:from_dict/4
Make forms a separate output from diameter_codegen
Remove last remnants of "spec"
Write as last step in code generation
Change extensions for debug output: .spec/forms -> .D/F
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That is, preprocessed forms that can be passed to compile:forms/1,2.
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The former was misleading since the timer only applies to initial
connection attempts, reconnection attempts being governed by
watchdog_timer. The name is a historic remnant from a (dark, pre-OTP)
time in which RFC 3539 was followed less slavishly than it is now, and
the timer actually did apply to reconnection attempts.
Note that connect_timer corresponds to RFC 6733 Tc, while watchdog_timer
corresponds to RFC 3539 TwInit. The latter RFC makes clear that TwInit
should apply to reconnection attempts. It's less clear if only RFC 6733
is read.
Note also that reconnect_timer is still accepted for backwards
compatibility. It would be possible to add an option to make
reconnect_timer behave strictly as the name suggests (ie. ignore RFC 3539
and interpret RFC 6733 at face value; something that has some value for
testing at least) but no such option is implemented in this commit.
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Function can now take a literal dictionary as input, instead of a path,
and can return results instead of writing them to the filesystem.
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The R16B02 release
Conflicts:
lib/sasl/vsn.mk
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To accept any nested list of codepoints and binaries. A list containing
a binary was previously misinterpreted and the documentation was
incomplete.
Also, rework codec suite slightly to be able to specify values for which
decode o encode is the identity map, for which encode should succeed,
and for which encode should fail.
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The R16B01 release
Conflicts:
lib/sasl/vsn.mk
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* anders/diameter/request_spawn/OTP-11060:
Minor doc fix
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* anders/diameter/release/R16B01/OTP-11120:
vsn -> 1.4.2
Update appup for R16B01
Trailing whitespace and copyright fixes
Minor macro simplification
Move app/appsrc from src/base into src
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* anders/diameter/request_spawn/OTP-11060:
Make spawn options for request processes configurable
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