1 files changed, 106 insertions, 0 deletions
diff --git a/lib/unicorn/app/inetd.rb b/lib/unicorn/app/inetd.rb
new file mode 100644
index 0000000..580b456
--- /dev/null
+++ b/lib/unicorn/app/inetd.rb
@@ -0,0 +1,106 @@
+# Copyright (c) 2009 Eric Wong
+# You can redistribute it and/or modify it under the same terms as Ruby.
+
+# this class *must* be used with Rack::Chunked
+
+module Unicorn::App
+  class Inetd < Struct.new(:cmd)
+
+    class CatBody < Struct.new(:errors, :err_rd, :out_rd, :pid_map)
+      def initialize(env, cmd)
+        self.errors = env['rack.errors']
+        in_rd, in_wr = IO.pipe
+        self.err_rd, err_wr = IO.pipe
+        self.out_rd, out_wr = IO.pipe
+
+        cmd_pid = fork {
+          inp, out, err = (0..2).map { |i| IO.new(i) }
+          inp.reopen(in_rd)
+          out.reopen(out_wr)
+          err.reopen(err_wr)
+          [ in_rd, in_wr, err_rd, err_wr, out_rd, out_wr ].each { |i| i.close }
+          exec(*cmd)
+        }
+        [ in_rd, err_wr, out_wr ].each { |io| io.close }
+        [ in_wr, err_rd, out_rd ].each { |io| io.binmode }
+        in_wr.sync = true
+
+        # Unfortunately, input here must be processed inside a seperate
+        # thread/process using blocking I/O since env['rack.input'] is not
+        # IO.select-able and attempting to make it so would trip Rack::Lint
+        inp_pid = fork {
+          input = env['rack.input']
+          [ err_rd, out_rd ].each { |io| io.close }
+          buf = Unicorn::Z.dup
+
+          # this is dependent on input.read having readpartial semantics:
+          while input.read(16384, buf)
+            in_wr.write(buf)
+          end
+          in_wr.close
+        }
+        in_wr.close
+        self.pid_map = {
+          inp_pid => 'input streamer',
+          cmd_pid => cmd.inspect,
+        }
+      end
+
+      def each(&block)
+        begin
+          rd, = IO.select([err_rd, out_rd])
+          rd && rd.first or next
+
+          if rd.include?(err_rd)
+            begin
+              errors.write(err_rd.read_nonblock(16384))
+            rescue Errno::EINTR
+            rescue Errno::EAGAIN
+              break
+            end while true
+          end
+
+          rd.include?(out_rd) or next
+
+          begin
+            yield out_rd.read_nonblock(16384)
+          rescue Errno::EINTR
+          rescue Errno::EAGAIN
+            break
+          end while true
+        rescue EOFError,Errno::EPIPE,Errno::EBADF,Errno::EINVAL
+          break
+        end while true
+
+        self
+      end
+
+      def close
+        pid_map.each { |pid, str|
+          begin
+            pid, status = Process.waitpid2(pid)
+            status.success? or
+              errors.write("#{str}: #{status.inspect} (PID:#{pid})\n")
+          rescue Errno::ECHILD
+            errors.write("Failed to reap #{str} (PID:#{pid})\n")
+          end
+        }
+      end
+
+    end
+
+    def initialize(*cmd)
+      self.cmd = cmd
+    end
+
+    def call(env)
+      /\A100-continue\z/i =~ env[Unicorn::Const::HTTP_EXPECT] and
+          return [ 100, {} , [] ]
+
+      [ 200, { 'Content-Type' => 'application/octet-stream' },
+       CatBody.new(env, cmd) ]
+    end
+
+  end
+
+end