refactor response body handling for sendfile(2)

This hopefully allows the "sendfile" gem to be required
anywhere in the Rainbows!/Unicorn config file, and not
have to be required via RUBYOPT or the '-r' command-line
switch.

We also modularize HttpResponse and avoids singleton methods
in the response path.  This (hopefully) makes it easier for
individual concurrency models to share code and override
individual methods.

1 files changed, 36 insertions, 0 deletions

diff --git a/lib/rainbows/fiber/body.rb b/lib/rainbows/fiber/body.rb
new file mode 100644
index 0000000..cd6c55c
--- /dev/null
+++ b/lib/rainbows/fiber/body.rb
@@ -0,0 +1,36 @@
+# -*- encoding: binary -*-
+# non-portable body handling for Fiber-based concurrency goes here
+# this module is required and included in worker processes only
+# this is meant to be included _after_ Rainbows::HttpResponse::Body
+module Rainbows::Fiber::Body # :nodoc:
+
+  # TODO non-blocking splice(2) under Linux
+  ALIASES = {
+    :write_body_stream => :write_body_each
+  }
+
+  # the sendfile 1.0.0+ gem includes IO#sendfile_nonblock
+  if ::IO.method_defined?(:sendfile_nonblock)
+    def write_body_file(client, body)
+      sock, off = client.to_io, 0
+      begin
+        off += sock.sendfile_nonblock(body, off, 0x10000)
+      rescue Errno::EAGAIN
+        client.wait_writable
+      rescue EOFError
+        break
+      rescue => e
+        Rainbows::Error.app(e)
+        break
+      end while true
+    end
+  else
+    ALIASES[:write_body] = :write_body_each
+  end
+
+  def self.included(klass)
+    ALIASES.each do |new_method, orig_method|
+      klass.__send__(:alias_method, new_method, orig_method)
+    end
+  end
+end