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authorAnders Svensson <[email protected]>2012-08-24 23:59:19 +0200
committerAnders Svensson <[email protected]>2012-08-26 11:26:38 +0200
commit26721653adec1e9d4a1032e766f8243085687bf3 (patch)
tree21146b545af1ea255a3b6d698bf6ec5a3417f515 /lib/diameter/src
parentb1cdee0b11c6fde89ba586b1c04724daf4a96a07 (diff)
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Maintain watchdog states in service_info
Diffstat (limited to 'lib/diameter/src')
-rw-r--r--lib/diameter/src/base/diameter_service.erl89
1 files changed, 73 insertions, 16 deletions
diff --git a/lib/diameter/src/base/diameter_service.erl b/lib/diameter/src/base/diameter_service.erl
index c9c3179630..0bba8117a5 100644
--- a/lib/diameter/src/base/diameter_service.erl
+++ b/lib/diameter/src/base/diameter_service.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2010-2011. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2012. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -65,9 +65,27 @@
-include_lib("diameter/include/diameter.hrl").
-include("diameter_internal.hrl").
+%% The "old" states maintained in this module historically.
-define(STATE_UP, up).
-define(STATE_DOWN, down).
+-type op_state() :: ?STATE_UP
+ | ?STATE_DOWN.
+
+%% The RFC 3539 watchdog states that are now maintained, albeit
+%% along with the old up/down. okay = up, else down.
+-define(WD_INITIAL, initial).
+-define(WD_OKAY, okay).
+-define(WD_SUSPECT, suspect).
+-define(WD_DOWN, down).
+-define(WD_REOPEN, reopen).
+
+-type wd_state() :: ?WD_INITIAL
+ | ?WD_OKAY
+ | ?WD_SUSPECT
+ | ?WD_DOWN
+ | ?WD_REOPEN.
+
-define(DEFAULT_TC, 30000). %% RFC 3588 ch 2.1
-define(DEFAULT_TIMEOUT, 5000). %% for outgoing requests
-define(RESTART_TC, 1000). %% if restart was this recent
@@ -117,7 +135,8 @@
type :: match(connect | accept),
ref :: match(reference()), %% key into diameter_config
options :: match([diameter:transport_opt()]),%% from start_transport
- op_state = ?STATE_DOWN :: match(?STATE_DOWN | ?STATE_UP),
+ op_state = {?STATE_DOWN, ?WD_INITIAL}
+ :: match(op_state() | {op_state(), wd_state()}),
started = now(), %% at process start
conn = false :: match(boolean() | pid())}).
%% true at accept, pid() at connection_up (connT key)
@@ -516,13 +535,33 @@ transition({reconnect, Pid}, S) ->
reconnect(Pid, S),
ok;
-%% Watchdog is sending notification of a state transition.
+%% Watchdog is sending notification of a state transition. Note that
+%% the connection_up/down messages are pre-date this message and are
+%% still used. A 'watchdog' message will follow these and communicate
+%% the same state as was set in handling connection_up/down.
transition({watchdog, Pid, {TPid, From, To}}, #state{service_name = SvcName,
peerT = PeerT}) ->
- #peer{ref = Ref, type = T, options = Opts}
+ #peer{ref = Ref, type = T, options = Opts, op_state = {OS,_}}
+ = P
= fetch(PeerT, Pid),
+ insert(PeerT, P#peer{op_state = {OS, To}}),
send_event(SvcName, {watchdog, Ref, TPid, {From, To}, {T, Opts}}),
ok;
+%% Death of a peer process results in the removal of it's peer and any
+%% associated conn record when 'DOWN' is received (after this) but the
+%% states will be {?STATE_UP, ?WD_DOWN} for a short time. (No real
+%% problem since ?WD_* is only used in service_info.) We set ?WD_OKAY
+%% as a consequence of connection_up since we know a watchdog is
+%% coming. We can't set anything at connection_down since we don't
+%% know if the subsequent watchdog message will be ?WD_DOWN or
+%% ?WD_SUSPECT. We don't (yet) set ?STATE_* as a consequence of a
+%% watchdog message since this requires changing some of the matching
+%% on ?STATE_*.
+%%
+%% Death of a conn process results in connection_down followed by
+%% watchdog ?WD_DOWN. The latter doesn't result in the conn record
+%% being deleted since 'DOWN' from death of its peer doesn't (yet)
+%% deal with the record having been removed.
%% Monitor process has died. Just die with a reason that tells
%% diameter_config about the happening. If a cleaner shutdown is
@@ -887,7 +926,14 @@ accepted(Pid, _TPid, #state{peerT = PeerT} = S) ->
fetch(Tid, Key) ->
[T] = ets:lookup(Tid, Key),
- T.
+ case T of
+ #peer{op_state = ?STATE_UP} = P ->
+ P#peer{op_state = {?STATE_UP, ?WD_OKAY}};
+ #peer{op_state = ?STATE_DOWN} = P ->
+ P#peer{op_state = {?STATE_DOWN, ?WD_DOWN}};
+ _ ->
+ T
+ end.
%%% ---------------------------------------------------------------------------
%%% # connection_up/3
@@ -933,12 +979,12 @@ connection_up(T, P, C, #state{peerT = PeerT,
service
= #diameter_service{applications = Apps}}
= S) ->
- #peer{conn = TPid, op_state = ?STATE_DOWN}
+ #peer{conn = TPid, op_state = {?STATE_DOWN, _}}
= P,
#conn{apps = SApps, caps = Caps}
= C,
- insert(PeerT, P#peer{op_state = ?STATE_UP}),
+ insert(PeerT, P#peer{op_state = {?STATE_UP, ?WD_OKAY}}),
request_peer_up(TPid),
report_status(up, P, C, S, T),
@@ -987,22 +1033,22 @@ peer_cb(MFA, Alias) ->
connection_down(Pid, #state{peerT = PeerT,
connT = ConnT}
= S) ->
- #peer{op_state = ?STATE_UP, %% assert
+ #peer{op_state = {?STATE_UP, WS}, %% assert
conn = TPid}
= P
= fetch(PeerT, Pid),
C = fetch(ConnT, TPid),
- insert(PeerT, P#peer{op_state = ?STATE_DOWN}),
+ insert(PeerT, P#peer{op_state = {?STATE_DOWN, WS}}),
connection_down(P,C,S).
%% connection_down/3
-connection_down(#peer{op_state = ?STATE_DOWN}, _, S) ->
+connection_down(#peer{op_state = {?STATE_DOWN, _}}, _, S) ->
S;
connection_down(#peer{conn = TPid,
- op_state = ?STATE_UP}
+ op_state = {?STATE_UP, _}}
= P,
#conn{caps = Caps,
apps = SApps}
@@ -1051,7 +1097,7 @@ peer_down(Pid, Reason, #state{peerT = PeerT} = S) ->
%% Send an event at connection establishment failure.
closed({shutdown, {close, _TPid, Reason}},
- #peer{op_state = ?STATE_DOWN,
+ #peer{op_state = {?STATE_DOWN, _},
ref = Ref,
type = Type,
options = Opts},
@@ -2858,15 +2904,26 @@ it_acc(ConnT, Acc, #peer{pid = Pid,
op_state = OS,
started = T,
conn = TPid}) ->
+ WS = wd_state(OS),
dict:append(Ref,
[{type, Type},
{options, Opts},
- {watchdog, {Pid, T, OS}}
- | info_conn(ConnT, TPid)],
+ {watchdog, {Pid, T, WS}}
+ | info_conn(ConnT, TPid, WS /= ?WD_DOWN)],
Acc).
-info_conn(ConnT, TPid) ->
- info_conn(ets:lookup(ConnT, TPid)).
+info_conn(ConnT, TPid, true)
+ when is_pid(TPid) ->
+ info_conn(ets:lookup(ConnT, TPid));
+info_conn(_, _, _) ->
+ [].
+
+wd_state({_,S}) ->
+ S;
+wd_state(?STATE_UP) ->
+ ?WD_OKAY;
+wd_state(?STATE_DOWN) ->
+ ?WD_DOWN.
info_conn([#conn{pid = Pid, apps = SApps, caps = Caps, started = T}]) ->
[{peer, {Pid, T}},