From 33e01409deec44e18d4c47012b88884493bd3235 Mon Sep 17 00:00:00 2001
From: Matthias Radestock <matthias@lshift.net>
Date: Wed, 30 Sep 2009 07:13:46 +0100
Subject: fix handling of precondition_failed

---
 src/rabbit_channel.erl | 18 ++++++------------
 src/rabbit_reader.erl  | 27 ++++++++++++++++++---------
 2 files changed, 24 insertions(+), 21 deletions(-)

diff --git a/src/rabbit_channel.erl b/src/rabbit_channel.erl
index a1fa1066..c1a5de1f 100644
--- a/src/rabbit_channel.erl
+++ b/src/rabbit_channel.erl
@@ -260,12 +260,6 @@ expand_routing_key_shortcut(<<>>, <<>>,
 expand_routing_key_shortcut(_QueueNameBin, RoutingKey, _State) ->
     RoutingKey.
 
-die_precondition_failed(Fmt, Params) ->
-    %% FIXME: 406 should be replaced with precondition_failed when we
-    %% move to AMQP spec >=8.1
-    rabbit_misc:protocol_error({false, 406, <<"PRECONDITION_FAILED">>},
-                               Fmt, Params).
-
 %% check that an exchange/queue name does not contain the reserved
 %% "amq."  prefix.
 %%
@@ -610,8 +604,8 @@ handle_method(#'exchange.delete'{exchange = ExchangeNameBin,
         {error, not_found} ->
             rabbit_misc:not_found(ExchangeName);
         {error, in_use} ->
-            die_precondition_failed(
-              "~s in use", [rabbit_misc:rs(ExchangeName)]);
+            rabbit_misc:protocol_error(
+              precondition_failed, "~s in use", [rabbit_misc:rs(ExchangeName)]);
         ok ->
             return_ok(State, NoWait,  #'exchange.delete_ok'{})
     end;
@@ -685,11 +679,11 @@ handle_method(#'queue.delete'{queue = QueueNameBin,
            QueueName,
            fun (Q) -> rabbit_amqqueue:delete(Q, IfUnused, IfEmpty) end) of
         {error, in_use} ->
-            die_precondition_failed(
-              "~s in use", [rabbit_misc:rs(QueueName)]);
+            rabbit_misc:protocol_error(
+              precondition_failed, "~s in use", [rabbit_misc:rs(QueueName)]);
         {error, not_empty} ->
-            die_precondition_failed(
-              "~s not empty", [rabbit_misc:rs(QueueName)]);
+            rabbit_misc:protocol_error(
+              precondition_failed, "~s not empty", [rabbit_misc:rs(QueueName)]);
         {ok, PurgedMessageCount} ->
             return_ok(State, NoWait,
                       #'queue.delete_ok'{
diff --git a/src/rabbit_reader.erl b/src/rabbit_reader.erl
index 5cc98992..057da787 100644
--- a/src/rabbit_reader.erl
+++ b/src/rabbit_reader.erl
@@ -751,18 +751,27 @@ map_exception(Channel, Reason) ->
         end,
     {ShouldClose, CloseChannel, CloseMethod}.
 
-lookup_amqp_exception(
-  #amqp_error{name = Name, explanation = Expl, method = Method}) ->
+%% FIXME: this clause can go when we move to AMQP spec >=8.1
+lookup_amqp_exception(#amqp_error{name        = precondition_failed,
+                                  explanation = Expl,
+                                  method       = Method}) ->
+    ExplBin = amqp_exception_explanation(<<"PRECONDITION_FAILED">>, Expl),
+    {false, 406, ExplBin, Method};
+lookup_amqp_exception(#amqp_error{name        = Name,
+                                  explanation = Expl,
+                                  method      = Method}) ->
     {ShouldClose, Code, Text} = rabbit_framing:lookup_amqp_exception(Name),
-    ExplBin = list_to_binary(Expl),
-    CompleteTextBin = <<Text/binary, " - ", ExplBin/binary>>,
-    SafeTextBin = if size(CompleteTextBin) > 255 ->
-                          <<CompleteTextBin:252/binary, "...">>;
-                     true -> CompleteTextBin
-                  end,
-    {ShouldClose, Code, SafeTextBin, Method};
+    ExplBin = amqp_exception_explanation(Text, Expl),
+    {ShouldClose, Code, ExplBin, Method};
 lookup_amqp_exception(Other) ->
     rabbit_log:warning("Non-AMQP exit reason '~p'~n", [Other]),
     {ShouldClose, Code, Text} =
         rabbit_framing:lookup_amqp_exception(internal_error),
     {ShouldClose, Code, Text, none}.
+
+amqp_exception_explanation(Text, Expl) ->
+    ExplBin = list_to_binary(Expl),
+    CompleteTextBin = <<Text/binary, " - ", ExplBin/binary>>,
+    if size(CompleteTextBin) > 255 -> <<CompleteTextBin:252/binary, "...">>;
+       true                        -> CompleteTextBin
+    end.
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