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* [PATCH] tee_input: simplify condition for IO#write
@ 2017-02-10 19:12 Eric Wong
  0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2017-02-10 19:12 UTC (permalink / raw)
  To: unicorn-public

IO#write already elides the write(2) syscall for empty buffers,
so there's no need to complicate our instruction sequence
footprint for the rare case of an empty buffer.

The only cases a Rack app will have an empty buffer are:

1) `env['rack.input'].read` without args
2) `env['rack.input'].gets`

Neither of these calls are safe for server-independent Rack apps
as the client can OOM the app.

unicorn itself provides no facility for limiting maximum
rack.input size.  Instead, unicorn relies on nginx to limit
input size using the client_max_body_size directive.
 lib/unicorn/tee_input.rb | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/lib/unicorn/tee_input.rb b/lib/unicorn/tee_input.rb
index 3c6d18a..6f66162 100644
--- a/lib/unicorn/tee_input.rb
+++ b/lib/unicorn/tee_input.rb
@@ -125,9 +125,7 @@ def consume!
   def tee(buffer)
-    if buffer && buffer.size > 0
-      @tmp.write(buffer)
-    end
+    @tmp.write(buffer) if buffer

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2017-02-10 19:12 [PATCH] tee_input: simplify condition for IO#write Eric Wong

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