Initial checkin of gRPC to third_party/

third_party/grpc/tools/codegen/core/gen_header_frame.py

Index: third_party/grpc/tools/codegen/core/gen_header_frame.py
diff --git a/third_party/grpc/tools/codegen/core/gen_header_frame.py b/third_party/grpc/tools/codegen/core/gen_header_frame.py
new file mode 100755
index 0000000000000000000000000000000000000000..96e6c67fa668a5863d2ada60ae8ae3d2ae883fb7
--- /dev/null
+++ b/third_party/grpc/tools/codegen/core/gen_header_frame.py
@@ -0,0 +1,105 @@
+#!/usr/bin/env python2.7
+
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Read from stdin a set of colon separated http headers:
+   :path: /foo/bar
+   content-type: application/grpc
+   Write a set of strings containing a hpack encoded http2 frame that
+   represents said headers."""
+
+import json
+import sys
+
+# parse input, fill in vals
+vals = []
+for line in sys.stdin:
+  line = line.strip()
+  if line == '': continue
+  if line[0] == '#': continue
+  key_tail, value = line[1:].split(':')
+  key = (line[0] + key_tail).strip()
+  value = value.strip()
+  vals.append((key, value))
+
+# generate frame payload binary data
+payload_bytes = [[]] # reserve space for header
+payload_len = 0
+for key, value in vals:
+  payload_line = []
+  payload_line.append(0x10)
+  assert(len(key) <= 126)
+  payload_line.append(len(key))
+  payload_line.extend(ord(c) for c in key)
+  assert(len(value) <= 126)
+  payload_line.append(len(value))
+  payload_line.extend(ord(c) for c in value)
+  payload_len += len(payload_line)
+  payload_bytes.append(payload_line)
+
+# fill in header
+payload_bytes[0].extend([
+    (payload_len >> 16) & 0xff,
+    (payload_len >> 8) & 0xff,
+    (payload_len) & 0xff,
+    # header frame
+    0x01,
+    # flags
+    0x04,
+    # stream id
+    0x00,
+    0x00,
+    0x00,
+    0x01
+])
+
+hex_bytes = [ord(c) for c in "abcdefABCDEF0123456789"]
+
+def esc_c(line):
+  out = "\""
+  last_was_hex = False
+  for c in line:
+    if 32 <= c < 127:
+      if c in hex_bytes and last_was_hex:
+        out += "\"\""
+      if c != ord('"'):
+        out += chr(c)
+      else:
+        out += "\\\""
+      last_was_hex = False
+    else:
+      out += "\\x%02x" % c
+      last_was_hex = True
+  return out + "\""
+
+# dump bytes
+for line in payload_bytes:
+  print esc_c(line)
+