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diff --git a/src/shrpx_mruby.h b/src/shrpx_mruby.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2015 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef SHRPX_MRUBY_H
+#define SHRPX_MRUBY_H
+
+#include "shrpx.h"
+
+#include <memory>
+
+#include <mruby.h>
+#include <mruby/proc.h>
+
+#include "template.h"
+
+using namespace nghttp2;
+
+namespace shrpx {
+
+class Downstream;
+
+namespace mruby {
+
+class MRubyContext {
+public:
+  MRubyContext(mrb_state *mrb, mrb_value app, mrb_value env);
+  ~MRubyContext();
+
+  int run_on_request_proc(Downstream *downstream);
+  int run_on_response_proc(Downstream *downstream);
+
+  int run_app(Downstream *downstream, int phase);
+
+  void delete_downstream(Downstream *downstream);
+
+private:
+  mrb_state *mrb_;
+  mrb_value app_;
+  mrb_value env_;
+};
+
+enum {
+  PHASE_NONE = 0,
+  PHASE_REQUEST = 1,
+  PHASE_RESPONSE = 1 << 1,
+};
+
+struct MRubyAssocData {
+  Downstream *downstream;
+  int phase;
+};
+
+RProc *compile(mrb_state *mrb, const StringRef &filename);
+
+std::unique_ptr<MRubyContext> create_mruby_context(const StringRef &filename);
+
+// Return interned |ptr|.
+mrb_sym intern_ptr(mrb_state *mrb, void *ptr);
+
+// Checks that |phase| is set in |phase_mask|.  If not set, raise
+// exception.
+void check_phase(mrb_state *mrb, int phase, int phase_mask);
+
+} // namespace mruby
+
+} // namespace shrpx
+
+#endif // SHRPX_MRUBY_H