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authorAnders Svensson <[email protected]>2012-10-04 19:12:05 +0200
committerAnders Svensson <[email protected]>2012-10-09 02:13:50 +0200
commit98836f68bd01ef82df5b9816a3ff065f02e50156 (patch)
treec8ddf3f000df801d13d9e58e6378737b7bb69715 /lib/diameter/doc/src
parentf24adb28f51ea35d13dcc501920ef727dfb2d61b (diff)
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Document eval_packet
Diffstat (limited to 'lib/diameter/doc/src')
-rw-r--r--lib/diameter/doc/src/diameter_app.xml67
1 files changed, 49 insertions, 18 deletions
diff --git a/lib/diameter/doc/src/diameter_app.xml b/lib/diameter/doc/src/diameter_app.xml
index 4a4b212787..98c8b8c807 100644
--- a/lib/diameter/doc/src/diameter_app.xml
+++ b/lib/diameter/doc/src/diameter_app.xml
@@ -325,33 +325,45 @@ or <seealso marker="#peer_down">peer_down/3</seealso> callback.</p>
<v>Packet = <seealso marker="#packet">packet()</seealso></v>
<v>SvcName = <seealso marker="diameter#service_name">diameter:service_name()</seealso></v>
<v>Peer = <seealso marker="#peer">peer()</seealso></v>
-<v>Action = {send, <seealso marker="#packet">packet()</seealso> | <seealso marker="#message">message()</seealso>} | {discard, Reason} | discard</v>
+<v>Action = Send | Discard | {eval_packet, Action, PostF}</v>
+<v>Send = {send, <seealso marker="#packet">packet()</seealso>
+ | <seealso marker="#message">message()</seealso>}</v>
+<v>Discard = {discard, Reason} | discard</v>
+<v>PostF =
+ <seealso marker="diameter#evaluable">diameter:evaluable()</seealso>}</v>
</type>
<desc>
<p>
Invoked to return a request for encoding and transport.
-Allows the sender to access the selected peer's capabilities
-in order to set (for example) <c>Destination-Host</c> and/or
-<c>Destination-Realm</c> in the outgoing request, although the
-callback need not be limited to this usage.
+Allows the sender to use the selected peer's capabilities
+to modify the outgoing request.
Many implementations may simply want to return <c>{send, Packet}</c></p>
<p>
-A returned <seealso marker="#packet">packet()</seealso> should set the request to be encoded in its
+A returned <seealso marker="#packet">packet()</seealso> should set the
+request to be encoded in its
<c>msg</c> field and can set the <c>transport_data</c> field in order
-to pass information to the transport module.
+to pass information to the transport process.
Extra arguments passed to <seealso
marker="diameter#call">diameter:call/4</seealso> can be used to
-communicate transport data to the callback.
-A returned <seealso marker="#packet">packet()</seealso> can also set the <c>header</c> field to a
-<c>#diameter_header{}</c> record in order to specify values that should
-be preserved in the outgoing request, although this should typically
-not be necessary and allows the callback to set header values
-inappropriately.
+communicate transport (or any other) data to the callback.</p>
+
+<p>
+A returned <seealso marker="#packet">packet()</seealso> can set
+the <c>header</c> field to a
+<c>#diameter_header{}</c> in order to specify values that should
+be preserved in the outgoing request, values otherwise being those in
+the header record contained in <c>Packet</c>.
A returned <c>length</c>, <c>cmd_code</c> or <c>application_id</c> is
ignored.</p>
<p>
+A returned <c>PostF</c> will be evaluated on any encoded
+<c>#diameter_packet{}</c> prior to transmission, the <c>bin</c> field
+of this record containing the encoded binary.
+The return value is ignored.</p>
+
+<p>
Returning <c>{discard, Reason}</c> causes the request to be aborted
and the <seealso
marker="diameter#call">diameter:call/4</seealso> for which the
@@ -364,13 +376,18 @@ discarded}</c>.</p>
</func>
<func>
-<name>Mod:prepare_retransmit(Packet, SvcName, Peer) -> Result</name>
+<name>Mod:prepare_retransmit(Packet, SvcName, Peer) -> Action</name>
<fsummary>Return a request for encoding and retransmission.</fsummary>
<type>
<v>Packet = <seealso marker="#packet">packet()</seealso></v>
<v>SvcName = <seealso marker="diameter#service_name">diameter:service_name()</seealso></v>
-<v>Peer = <seealso marker="#peer">peer()</seealso></v>
-<v>Result = {send, <seealso marker="#packet">packet()</seealso> | <seealso marker="#message">message()</seealso>} | {discard, Reason} | discard</v>
+<v>Peer = <seealso marker="#peer">peer()</seealso></v>
+<v>Action = Send | Discard | {eval_packet, Action, PostF}</v>
+<v>Send = {send, <seealso marker="#packet">packet()</seealso>
+ | <seealso marker="#message">message()</seealso>}</v>
+<v>Discard = {discard, Reason} | discard</v>
+<v>PostF =
+ <seealso marker="diameter#evaluable">diameter:evaluable()</seealso>}</v>
</type>
<desc>
<p>
@@ -484,7 +501,11 @@ callback returned false.</p>
<v>Packet = <seealso marker="#packet">packet()</seealso></v>
<v>SvcName = term()</v>
<v>Peer = <seealso marker="#peer">peer()</seealso></v>
-<v>Action = Reply | {relay, [Opt]} | discard | {eval, Action, PostF}</v>
+<v>Action = Reply
+ | {relay, [Opt]}
+ | discard
+ | {eval, Action, PostF}
+ | {eval_packet, Action, PostF}</v>
<v>Reply = {reply, <seealso marker="#message">message()</seealso>}
| {protocol_error, 3000..3999}</v>
<v>Opt = <seealso marker="diameter#call_opt">diameter:call_opt()</seealso></v>
@@ -610,7 +631,17 @@ Discard the request.</p>
<item>
<p>
Handle the request as if <c>Action</c> has been returned and then
-evaluate <c>PostF</c> in the request process.</p>
+evaluate <c>PostF</c> in the request process.
+The return value is ignored.</p>
+</item>
+
+<tag><c>{eval_packet, Action, PostF}</c></tag>
+<item>
+<p>
+Like <c>eval</c> but evaluate <c>PostF</c> on any encoded
+<c>#diameter_packet{}</c> prior to transmission, the <c>bin</c> field
+of this record containing the encoded binary.
+The return value is ignored.</p>
</item>
</taglist>