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chromium / chromium / src / 510e13d15 / . / net / spdy / spdy_protocol.h
blob: 86eb9b1a4006bb533504294da741053c9a22f2aa [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file contains some protocol structures for use with SPDY 3 and HTTP 2
// The SPDY 3 spec can be found at:
// http://dev.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3
#ifndef NET_SPDY_SPDY_PROTOCOL_H_
#define NET_SPDY_SPDY_PROTOCOL_H_
#include <stddef.h>
#include <stdint.h>
#include <limits>
#include <map>
#include <string>
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_piece.h"
#include "base/sys_byteorder.h"
#include "net/base/net_export.h"
#include "net/spdy/spdy_alt_svc_wire_format.h"
#include "net/spdy/spdy_bitmasks.h"
#include "net/spdy/spdy_header_block.h"
namespace net {
// The major versions of SPDY. Major version differences indicate
// framer-layer incompatibility, as opposed to minor version numbers
// which indicate application-layer incompatibility. It is NOT guaranteed
// that the enum value SPDYn maps to the integer n.
enum SpdyMajorVersion {
SPDY3 = 1,
SPDY_MIN_VERSION = SPDY3,
HTTP2,
SPDY_MAX_VERSION = HTTP2
};
// A SPDY stream id is a 31 bit entity.
typedef uint32_t SpdyStreamId;
// Specifies the stream ID used to denote the current session (for
// flow control).
const SpdyStreamId kSessionFlowControlStreamId = 0;
// The maxmium possible control frame size allowed by the spec.
const int32_t kSpdyMaxControlFrameSize = (1 << 24) - 1;
// The maximum control frame size we accept.
const int32_t kControlFrameSizeLimit = 1 << 14;
// Maximum window size for a Spdy stream or session.
const int32_t kSpdyMaximumWindowSize = 0x7FFFFFFF; // Max signed 32bit int
// Maximum padding size in octets for one DATA or HEADERS or PUSH_PROMISE frame.
const int32_t kPaddingSizePerFrame = 256;
// SPDY 3 dictionary.
const char kV3Dictionary[] = {
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0x65, 0x61, 0x64, 0x00, 0x00, 0x00, 0x04, 0x70, // ead....p
0x6f, 0x73, 0x74, 0x00, 0x00, 0x00, 0x03, 0x70, // ost....p
0x75, 0x74, 0x00, 0x00, 0x00, 0x06, 0x64, 0x65, // ut....de
0x6c, 0x65, 0x74, 0x65, 0x00, 0x00, 0x00, 0x05, // lete....
0x74, 0x72, 0x61, 0x63, 0x65, 0x00, 0x00, 0x00, // trace...
0x06, 0x61, 0x63, 0x63, 0x65, 0x70, 0x74, 0x00, // .accept.
0x00, 0x00, 0x0e, 0x61, 0x63, 0x63, 0x65, 0x70, // ...accep
0x74, 0x2d, 0x63, 0x68, 0x61, 0x72, 0x73, 0x65, // t-charse
0x74, 0x00, 0x00, 0x00, 0x0f, 0x61, 0x63, 0x63, // t....acc
0x65, 0x70, 0x74, 0x2d, 0x65, 0x6e, 0x63, 0x6f, // ept-enco
0x64, 0x69, 0x6e, 0x67, 0x00, 0x00, 0x00, 0x0f, // ding....
0x61, 0x63, 0x63, 0x65, 0x70, 0x74, 0x2d, 0x6c, // accept-l
0x61, 0x6e, 0x67, 0x75, 0x61, 0x67, 0x65, 0x00, // anguage.
0x00, 0x00, 0x0d, 0x61, 0x63, 0x63, 0x65, 0x70, // ...accep
0x74, 0x2d, 0x72, 0x61, 0x6e, 0x67, 0x65, 0x73, // t-ranges
0x00, 0x00, 0x00, 0x03, 0x61, 0x67, 0x65, 0x00, // ....age.
0x00, 0x00, 0x05, 0x61, 0x6c, 0x6c, 0x6f, 0x77, // ...allow
0x00, 0x00, 0x00, 0x0d, 0x61, 0x75, 0x74, 0x68, // ....auth
0x6f, 0x72, 0x69, 0x7a, 0x61, 0x74, 0x69, 0x6f, // orizatio
0x6e, 0x00, 0x00, 0x00, 0x0d, 0x63, 0x61, 0x63, // n....cac
0x68, 0x65, 0x2d, 0x63, 0x6f, 0x6e, 0x74, 0x72, // he-contr
0x6f, 0x6c, 0x00, 0x00, 0x00, 0x0a, 0x63, 0x6f, // ol....co
0x6e, 0x6e, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, // nnection
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0x65, 0x6e, 0x74, 0x2d, 0x62, 0x61, 0x73, 0x65, // ent-base
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0x64, 0x69, 0x6e, 0x67, 0x00, 0x00, 0x00, 0x10, // ding....
0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74, 0x2d, // content-
0x6c, 0x61, 0x6e, 0x67, 0x75, 0x61, 0x67, 0x65, // language
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0x65, 0x6e, 0x74, 0x2d, 0x6c, 0x65, 0x6e, 0x67, // ent-leng
0x74, 0x68, 0x00, 0x00, 0x00, 0x10, 0x63, 0x6f, // th....co
0x6e, 0x74, 0x65, 0x6e, 0x74, 0x2d, 0x6c, 0x6f, // ntent-lo
0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x00, 0x00, // cation..
0x00, 0x0b, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, // ..conten
0x74, 0x2d, 0x6d, 0x64, 0x35, 0x00, 0x00, 0x00, // t-md5...
0x0d, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74, // .content
0x2d, 0x72, 0x61, 0x6e, 0x67, 0x65, 0x00, 0x00, // -range..
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0x00, 0x06, 0x65, 0x78, 0x70, 0x65, 0x63, 0x74, // ..expect
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0x72, 0x65, 0x73, 0x00, 0x00, 0x00, 0x04, 0x66, // res....f
0x72, 0x6f, 0x6d, 0x00, 0x00, 0x00, 0x04, 0x68, // rom....h
0x6f, 0x73, 0x74, 0x00, 0x00, 0x00, 0x08, 0x69, // ost....i
0x66, 0x2d, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x00, // f-match.
0x00, 0x00, 0x11, 0x69, 0x66, 0x2d, 0x6d, 0x6f, // ...if-mo
0x64, 0x69, 0x66, 0x69, 0x65, 0x64, 0x2d, 0x73, // dified-s
0x69, 0x6e, 0x63, 0x65, 0x00, 0x00, 0x00, 0x0d, // ince....
0x69, 0x66, 0x2d, 0x6e, 0x6f, 0x6e, 0x65, 0x2d, // if-none-
0x6d, 0x61, 0x74, 0x63, 0x68, 0x00, 0x00, 0x00, // match...
0x08, 0x69, 0x66, 0x2d, 0x72, 0x61, 0x6e, 0x67, // .if-rang
0x65, 0x00, 0x00, 0x00, 0x13, 0x69, 0x66, 0x2d, // e....if-
0x75, 0x6e, 0x6d, 0x6f, 0x64, 0x69, 0x66, 0x69, // unmodifi
0x65, 0x64, 0x2d, 0x73, 0x69, 0x6e, 0x63, 0x65, // ed-since
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0x2d, 0x6d, 0x6f, 0x64, 0x69, 0x66, 0x69, 0x65, // -modifie
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0x61, 0x74, 0x69, 0x6f, 0x6e, 0x00, 0x00, 0x00, // ation...
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0x06, 0x70, 0x72, 0x61, 0x67, 0x6d, 0x61, 0x00, // .pragma.
0x00, 0x00, 0x12, 0x70, 0x72, 0x6f, 0x78, 0x79, // ...proxy
0x2d, 0x61, 0x75, 0x74, 0x68, 0x65, 0x6e, 0x74, // -authent
0x69, 0x63, 0x61, 0x74, 0x65, 0x00, 0x00, 0x00, // icate...
0x13, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2d, 0x61, // .proxy-a
0x75, 0x74, 0x68, 0x6f, 0x72, 0x69, 0x7a, 0x61, // uthoriza
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0x72, 0x61, 0x6e, 0x67, 0x65, 0x00, 0x00, 0x00, // range...
0x07, 0x72, 0x65, 0x66, 0x65, 0x72, 0x65, 0x72, // .referer
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0x79, 0x2d, 0x61, 0x66, 0x74, 0x65, 0x72, 0x00, // y-after.
0x00, 0x00, 0x06, 0x73, 0x65, 0x72, 0x76, 0x65, // ...serve
0x72, 0x00, 0x00, 0x00, 0x02, 0x74, 0x65, 0x00, // r....te.
0x00, 0x00, 0x07, 0x74, 0x72, 0x61, 0x69, 0x6c, // ...trail
0x65, 0x72, 0x00, 0x00, 0x00, 0x11, 0x74, 0x72, // er....tr
0x61, 0x6e, 0x73, 0x66, 0x65, 0x72, 0x2d, 0x65, // ansfer-e
0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x00, // ncoding.
0x00, 0x00, 0x07, 0x75, 0x70, 0x67, 0x72, 0x61, // ...upgra
0x64, 0x65, 0x00, 0x00, 0x00, 0x0a, 0x75, 0x73, // de....us
0x65, 0x72, 0x2d, 0x61, 0x67, 0x65, 0x6e, 0x74, // er-agent
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0x00, 0x00, 0x00, 0x03, 0x76, 0x69, 0x61, 0x00, // ....via.
0x00, 0x00, 0x07, 0x77, 0x61, 0x72, 0x6e, 0x69, // ...warni
0x6e, 0x67, 0x00, 0x00, 0x00, 0x10, 0x77, 0x77, // ng....ww
0x77, 0x2d, 0x61, 0x75, 0x74, 0x68, 0x65, 0x6e, // w-authen
0x74, 0x69, 0x63, 0x61, 0x74, 0x65, 0x00, 0x00, // ticate..
0x00, 0x06, 0x6d, 0x65, 0x74, 0x68, 0x6f, 0x64, // ..method
0x00, 0x00, 0x00, 0x03, 0x67, 0x65, 0x74, 0x00, // ....get.
0x00, 0x00, 0x06, 0x73, 0x74, 0x61, 0x74, 0x75, // ...statu
0x73, 0x00, 0x00, 0x00, 0x06, 0x32, 0x30, 0x30, // s....200
0x20, 0x4f, 0x4b, 0x00, 0x00, 0x00, 0x07, 0x76, // .OK....v
0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x00, 0x00, // ersion..
0x00, 0x08, 0x48, 0x54, 0x54, 0x50, 0x2f, 0x31, // ..HTTP.1
0x2e, 0x31, 0x00, 0x00, 0x00, 0x03, 0x75, 0x72, // .1....ur
0x6c, 0x00, 0x00, 0x00, 0x06, 0x70, 0x75, 0x62, // l....pub
0x6c, 0x69, 0x63, 0x00, 0x00, 0x00, 0x0a, 0x73, // lic....s
0x65, 0x74, 0x2d, 0x63, 0x6f, 0x6f, 0x6b, 0x69, // et-cooki
0x65, 0x00, 0x00, 0x00, 0x0a, 0x6b, 0x65, 0x65, // e....kee
0x70, 0x2d, 0x61, 0x6c, 0x69, 0x76, 0x65, 0x00, // p-alive.
0x00, 0x00, 0x06, 0x6f, 0x72, 0x69, 0x67, 0x69, // ...origi
0x6e, 0x31, 0x30, 0x30, 0x31, 0x30, 0x31, 0x32, // n1001012
0x30, 0x31, 0x32, 0x30, 0x32, 0x32, 0x30, 0x35, // 01202205
0x32, 0x30, 0x36, 0x33, 0x30, 0x30, 0x33, 0x30, // 20630030
0x32, 0x33, 0x30, 0x33, 0x33, 0x30, 0x34, 0x33, // 23033043
0x30, 0x35, 0x33, 0x30, 0x36, 0x33, 0x30, 0x37, // 05306307
0x34, 0x30, 0x32, 0x34, 0x30, 0x35, 0x34, 0x30, // 40240540
0x36, 0x34, 0x30, 0x37, 0x34, 0x30, 0x38, 0x34, // 64074084
0x30, 0x39, 0x34, 0x31, 0x30, 0x34, 0x31, 0x31, // 09410411
0x34, 0x31, 0x32, 0x34, 0x31, 0x33, 0x34, 0x31, // 41241341
0x34, 0x34, 0x31, 0x35, 0x34, 0x31, 0x36, 0x34, // 44154164
0x31, 0x37, 0x35, 0x30, 0x32, 0x35, 0x30, 0x34, // 17502504
0x35, 0x30, 0x35, 0x32, 0x30, 0x33, 0x20, 0x4e, // 505203.N
0x6f, 0x6e, 0x2d, 0x41, 0x75, 0x74, 0x68, 0x6f, // on-Autho
0x72, 0x69, 0x74, 0x61, 0x74, 0x69, 0x76, 0x65, // ritative
0x20, 0x49, 0x6e, 0x66, 0x6f, 0x72, 0x6d, 0x61, // .Informa
0x74, 0x69, 0x6f, 0x6e, 0x32, 0x30, 0x34, 0x20, // tion204.
0x4e, 0x6f, 0x20, 0x43, 0x6f, 0x6e, 0x74, 0x65, // No.Conte
0x6e, 0x74, 0x33, 0x30, 0x31, 0x20, 0x4d, 0x6f, // nt301.Mo
0x76, 0x65, 0x64, 0x20, 0x50, 0x65, 0x72, 0x6d, // ved.Perm
0x61, 0x6e, 0x65, 0x6e, 0x74, 0x6c, 0x79, 0x34, // anently4
0x30, 0x30, 0x20, 0x42, 0x61, 0x64, 0x20, 0x52, // 00.Bad.R
0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x34, 0x30, // equest40
0x31, 0x20, 0x55, 0x6e, 0x61, 0x75, 0x74, 0x68, // 1.Unauth
0x6f, 0x72, 0x69, 0x7a, 0x65, 0x64, 0x34, 0x30, // orized40
0x33, 0x20, 0x46, 0x6f, 0x72, 0x62, 0x69, 0x64, // 3.Forbid
0x64, 0x65, 0x6e, 0x34, 0x30, 0x34, 0x20, 0x4e, // den404.N
0x6f, 0x74, 0x20, 0x46, 0x6f, 0x75, 0x6e, 0x64, // ot.Found
0x35, 0x30, 0x30, 0x20, 0x49, 0x6e, 0x74, 0x65, // 500.Inte
0x72, 0x6e, 0x61, 0x6c, 0x20, 0x53, 0x65, 0x72, // rnal.Ser
0x76, 0x65, 0x72, 0x20, 0x45, 0x72, 0x72, 0x6f, // ver.Erro
0x72, 0x35, 0x30, 0x31, 0x20, 0x4e, 0x6f, 0x74, // r501.Not
0x20, 0x49, 0x6d, 0x70, 0x6c, 0x65, 0x6d, 0x65, // .Impleme
0x6e, 0x74, 0x65, 0x64, 0x35, 0x30, 0x33, 0x20, // nted503.
0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x20, // Service.
0x55, 0x6e, 0x61, 0x76, 0x61, 0x69, 0x6c, 0x61, // Unavaila
0x62, 0x6c, 0x65, 0x4a, 0x61, 0x6e, 0x20, 0x46, // bleJan.F
0x65, 0x62, 0x20, 0x4d, 0x61, 0x72, 0x20, 0x41, // eb.Mar.A
0x70, 0x72, 0x20, 0x4d, 0x61, 0x79, 0x20, 0x4a, // pr.May.J
0x75, 0x6e, 0x20, 0x4a, 0x75, 0x6c, 0x20, 0x41, // un.Jul.A
0x75, 0x67, 0x20, 0x53, 0x65, 0x70, 0x74, 0x20, // ug.Sept.
0x4f, 0x63, 0x74, 0x20, 0x4e, 0x6f, 0x76, 0x20, // Oct.Nov.
0x44, 0x65, 0x63, 0x20, 0x30, 0x30, 0x3a, 0x30, // Dec.00.0
0x30, 0x3a, 0x30, 0x30, 0x20, 0x4d, 0x6f, 0x6e, // 0.00.Mon
0x2c, 0x20, 0x54, 0x75, 0x65, 0x2c, 0x20, 0x57, // ..Tue..W
0x65, 0x64, 0x2c, 0x20, 0x54, 0x68, 0x75, 0x2c, // ed..Thu.
0x20, 0x46, 0x72, 0x69, 0x2c, 0x20, 0x53, 0x61, // .Fri..Sa
0x74, 0x2c, 0x20, 0x53, 0x75, 0x6e, 0x2c, 0x20, // t..Sun..
0x47, 0x4d, 0x54, 0x63, 0x68, 0x75, 0x6e, 0x6b, // GMTchunk
0x65, 0x64, 0x2c, 0x74, 0x65, 0x78, 0x74, 0x2f, // ed.text.
0x68, 0x74, 0x6d, 0x6c, 0x2c, 0x69, 0x6d, 0x61, // html.ima
0x67, 0x65, 0x2f, 0x70, 0x6e, 0x67, 0x2c, 0x69, // ge.png.i
0x6d, 0x61, 0x67, 0x65, 0x2f, 0x6a, 0x70, 0x67, // mage.jpg
0x2c, 0x69, 0x6d, 0x61, 0x67, 0x65, 0x2f, 0x67, // .image.g
0x69, 0x66, 0x2c, 0x61, 0x70, 0x70, 0x6c, 0x69, // if.appli
0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x78, // cation.x
0x6d, 0x6c, 0x2c, 0x61, 0x70, 0x70, 0x6c, 0x69, // ml.appli
0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x78, // cation.x
0x68, 0x74, 0x6d, 0x6c, 0x2b, 0x78, 0x6d, 0x6c, // html.xml
0x2c, 0x74, 0x65, 0x78, 0x74, 0x2f, 0x70, 0x6c, // .text.pl
0x61, 0x69, 0x6e, 0x2c, 0x74, 0x65, 0x78, 0x74, // ain.text
0x2f, 0x6a, 0x61, 0x76, 0x61, 0x73, 0x63, 0x72, // .javascr
0x69, 0x70, 0x74, 0x2c, 0x70, 0x75, 0x62, 0x6c, // ipt.publ
0x69, 0x63, 0x70, 0x72, 0x69, 0x76, 0x61, 0x74, // icprivat
0x65, 0x6d, 0x61, 0x78, 0x2d, 0x61, 0x67, 0x65, // emax-age
0x3d, 0x67, 0x7a, 0x69, 0x70, 0x2c, 0x64, 0x65, // .gzip.de
0x66, 0x6c, 0x61, 0x74, 0x65, 0x2c, 0x73, 0x64, // flate.sd
0x63, 0x68, 0x63, 0x68, 0x61, 0x72, 0x73, 0x65, // chcharse
0x74, 0x3d, 0x75, 0x74, 0x66, 0x2d, 0x38, 0x63, // t.utf-8c
0x68, 0x61, 0x72, 0x73, 0x65, 0x74, 0x3d, 0x69, // harset.i
0x73, 0x6f, 0x2d, 0x38, 0x38, 0x35, 0x39, 0x2d, // so-8859-
0x31, 0x2c, 0x75, 0x74, 0x66, 0x2d, 0x2c, 0x2a, // 1.utf-..
0x2c, 0x65, 0x6e, 0x71, 0x3d, 0x30, 0x2e // .enq.0.
};
const int kV3DictionarySize = arraysize(kV3Dictionary);
// The HTTP/2 connection header prefix, which must be the first bytes
// sent by the client upon starting an HTTP/2 connection, and which
// must be followed by a SETTINGS frame.
//
// Equivalent to the string "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
// (without the null terminator).
const char kHttp2ConnectionHeaderPrefix[] = {
0x50, 0x52, 0x49, 0x20, 0x2a, 0x20, 0x48, 0x54, // PRI * HT
0x54, 0x50, 0x2f, 0x32, 0x2e, 0x30, 0x0d, 0x0a, // TP/2.0..
0x0d, 0x0a, 0x53, 0x4d, 0x0d, 0x0a, 0x0d, 0x0a // ..SM....
};
const int kHttp2ConnectionHeaderPrefixSize =
arraysize(kHttp2ConnectionHeaderPrefix);
const char kHttp2VersionString[] = "HTTP/1.1";
// Types of SPDY frames.
enum SpdyFrameType {
DATA,
SYN_STREAM,
SYN_REPLY,
RST_STREAM,
SETTINGS,
PING,
GOAWAY,
HEADERS,
WINDOW_UPDATE,
PUSH_PROMISE,
CONTINUATION,
PRIORITY,
// BLOCKED and ALTSVC are recognized extensions.
BLOCKED,
ALTSVC,
};
// Flags on data packets.
enum SpdyDataFlags {
DATA_FLAG_NONE = 0x00,
DATA_FLAG_FIN = 0x01,
DATA_FLAG_END_SEGMENT = 0x02,
DATA_FLAG_PADDED = 0x08,
DATA_FLAG_COMPRESSED = 0x20,
};
// Flags on control packets
enum SpdyControlFlags {
CONTROL_FLAG_NONE = 0x00,
CONTROL_FLAG_FIN = 0x01,
CONTROL_FLAG_UNIDIRECTIONAL = 0x02,
};
enum SpdyPingFlags {
PING_FLAG_ACK = 0x01,
};
// Used by HEADERS, PUSH_PROMISE, and CONTINUATION.
enum SpdyHeadersFlags {
HEADERS_FLAG_END_SEGMENT = 0x02,
HEADERS_FLAG_END_HEADERS = 0x04,
HEADERS_FLAG_PADDED = 0x08,
HEADERS_FLAG_PRIORITY = 0x20,
};
enum SpdyPushPromiseFlags {
PUSH_PROMISE_FLAG_END_PUSH_PROMISE = 0x04,
PUSH_PROMISE_FLAG_PADDED = 0x08,
};
// Flags on the SETTINGS control frame.
enum SpdySettingsControlFlags {
SETTINGS_FLAG_CLEAR_PREVIOUSLY_PERSISTED_SETTINGS = 0x01,
};
enum Http2SettingsControlFlags {
SETTINGS_FLAG_ACK = 0x01,
};
// Flags for settings within a SETTINGS frame.
enum SpdySettingsFlags {
SETTINGS_FLAG_NONE = 0x00,
SETTINGS_FLAG_PLEASE_PERSIST = 0x01,
SETTINGS_FLAG_PERSISTED = 0x02,
};
// List of known settings. Avoid changing these enum values, as persisted
// settings are keyed on them, and they are also exposed in net-internals.
enum SpdySettingsIds {
SETTINGS_UPLOAD_BANDWIDTH = 0x1,
SETTINGS_DOWNLOAD_BANDWIDTH = 0x2,
// Network round trip time in milliseconds.
SETTINGS_ROUND_TRIP_TIME = 0x3,
// The maximum number of simultaneous live streams in each direction.
SETTINGS_MAX_CONCURRENT_STREAMS = 0x4,
// TCP congestion window in packets.
SETTINGS_CURRENT_CWND = 0x5,
// Downstream byte retransmission rate in percentage.
SETTINGS_DOWNLOAD_RETRANS_RATE = 0x6,
// Initial window size in bytes
SETTINGS_INITIAL_WINDOW_SIZE = 0x7,
// HPACK header table maximum size.
SETTINGS_HEADER_TABLE_SIZE = 0x8,
// Whether or not server push (PUSH_PROMISE) is enabled.
SETTINGS_ENABLE_PUSH = 0x9,
// The size of the largest frame payload that a receiver is willing to accept.
SETTINGS_MAX_FRAME_SIZE = 0xa,
// The maximum size of header list that the sender is prepared to accept.
SETTINGS_MAX_HEADER_LIST_SIZE = 0xb,
};
// Status codes for RST_STREAM frames.
enum SpdyRstStreamStatus {
RST_STREAM_INVALID = 0,
RST_STREAM_PROTOCOL_ERROR = 1,
RST_STREAM_INVALID_STREAM = 2,
RST_STREAM_STREAM_CLOSED = 2, // Equivalent to INVALID_STREAM
RST_STREAM_REFUSED_STREAM = 3,
RST_STREAM_UNSUPPORTED_VERSION = 4,
RST_STREAM_CANCEL = 5,
RST_STREAM_INTERNAL_ERROR = 6,
RST_STREAM_FLOW_CONTROL_ERROR = 7,
RST_STREAM_STREAM_IN_USE = 8,
RST_STREAM_STREAM_ALREADY_CLOSED = 9,
// FRAME_TOO_LARGE (defined by SPDY versions 3.1 and below), and
// FRAME_SIZE_ERROR (defined by HTTP/2) are mapped to the same internal
// reset status.
RST_STREAM_FRAME_TOO_LARGE = 11,
RST_STREAM_FRAME_SIZE_ERROR = 11,
RST_STREAM_SETTINGS_TIMEOUT = 12,
RST_STREAM_CONNECT_ERROR = 13,
RST_STREAM_ENHANCE_YOUR_CALM = 14,
RST_STREAM_INADEQUATE_SECURITY = 15,
RST_STREAM_HTTP_1_1_REQUIRED = 16,
RST_STREAM_NUM_STATUS_CODES = 17
};
// Status codes for GOAWAY frames.
enum SpdyGoAwayStatus {
GOAWAY_OK = 0,
GOAWAY_NO_ERROR = GOAWAY_OK,
GOAWAY_PROTOCOL_ERROR = 1,
GOAWAY_INTERNAL_ERROR = 2,
GOAWAY_FLOW_CONTROL_ERROR = 3,
GOAWAY_SETTINGS_TIMEOUT = 4,
GOAWAY_STREAM_CLOSED = 5,
GOAWAY_FRAME_SIZE_ERROR = 6,
GOAWAY_REFUSED_STREAM = 7,
GOAWAY_CANCEL = 8,
GOAWAY_COMPRESSION_ERROR = 9,
GOAWAY_CONNECT_ERROR = 10,
GOAWAY_ENHANCE_YOUR_CALM = 11,
GOAWAY_INADEQUATE_SECURITY = 12,
GOAWAY_HTTP_1_1_REQUIRED = 13
};
// A SPDY priority is a number between 0 and 7 (inclusive).
typedef uint8_t SpdyPriority;
// Lowest and Highest here refer to SPDY priorities as described in
// https://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3-1#TOC-2.3.3-Stream-priority
const SpdyPriority kV3HighestPriority = 0;
const SpdyPriority kV3LowestPriority = 7;
typedef uint64_t SpdyPingId;
typedef std::string SpdyProtocolId;
enum class SpdyHeaderValidatorType {
REQUEST,
RESPONSE_HEADER,
RESPONSE_TRAILER
};
// TODO(hkhalil): Add direct testing for this? It won't increase coverage any,
// but is good to do anyway.
class NET_EXPORT_PRIVATE SpdyConstants {
public:
// Returns true if a given on-the-wire enumeration of a frame type is valid
// for a given protocol version, false otherwise.
static bool IsValidFrameType(SpdyMajorVersion version, int frame_type_field);
// Parses a frame type from an on-the-wire enumeration of a given protocol
// version.
// Behavior is undefined for invalid frame type fields; consumers should first
// use IsValidFrameType() to verify validity of frame type fields.
static SpdyFrameType ParseFrameType(SpdyMajorVersion version,
int frame_type_field);
// Serializes a given frame type to the on-the-wire enumeration value for the
// given protocol version.
// Returns -1 on failure (I.E. Invalid frame type for the given version).
static int SerializeFrameType(SpdyMajorVersion version,
SpdyFrameType frame_type);
// Returns the frame type for non-control (i.e. data) frames
// in the given SPDY version.
static int DataFrameType(SpdyMajorVersion version);
// Returns true if a given on-the-wire enumeration of a setting id is valid
// for a given protocol version, false otherwise.
static bool IsValidSettingId(SpdyMajorVersion version, int setting_id_field);
// Parses a setting id from an on-the-wire enumeration of a given protocol
// version.
// Behavior is undefined for invalid setting id fields; consumers should first
// use IsValidSettingId() to verify validity of setting id fields.
static SpdySettingsIds ParseSettingId(SpdyMajorVersion version,
int setting_id_field);
// Serializes a given setting id to the on-the-wire enumeration value for the
// given protocol version.
// Returns -1 on failure (I.E. Invalid setting id for the given version).
static int SerializeSettingId(SpdyMajorVersion version, SpdySettingsIds id);
// Returns true if a given on-the-wire enumeration of a RST_STREAM status code
// is valid for a given protocol version, false otherwise.
static bool IsValidRstStreamStatus(SpdyMajorVersion version,
int rst_stream_status_field);
// Parses a RST_STREAM status code from an on-the-wire enumeration of a given
// protocol version.
// Behavior is undefined for invalid RST_STREAM status code fields; consumers
// should first use IsValidRstStreamStatus() to verify validity of RST_STREAM
// status code fields..
static SpdyRstStreamStatus ParseRstStreamStatus(SpdyMajorVersion version,
int rst_stream_status_field);
// Serializes a given RST_STREAM status code to the on-the-wire enumeration
// value for the given protocol version.
// Returns -1 on failure (I.E. Invalid RST_STREAM status code for the given
// version).
static int SerializeRstStreamStatus(SpdyMajorVersion version,
SpdyRstStreamStatus rst_stream_status);
// Returns true if a given on-the-wire enumeration of a GOAWAY status code is
// valid for the given protocol version, false otherwise.
static bool IsValidGoAwayStatus(SpdyMajorVersion version,
int goaway_status_field);
// Parses a GOAWAY status from an on-the-wire enumeration of a given protocol
// version.
// Behavior is undefined for invalid GOAWAY status fields; consumers should
// first use IsValidGoAwayStatus() to verify validity of GOAWAY status fields.
static SpdyGoAwayStatus ParseGoAwayStatus(SpdyMajorVersion version,
int goaway_status_field);
// Serializes a given GOAWAY status to the on-the-wire enumeration value for
// the given protocol version.
// Returns -1 on failure (I.E. Invalid GOAWAY status for the given version).
static int SerializeGoAwayStatus(SpdyMajorVersion version,
SpdyGoAwayStatus status);
// Size, in bytes, of the data frame header. Future versions of SPDY
// will likely vary this, so we allow for the flexibility of a function call
// for this value as opposed to a constant.
static size_t GetDataFrameMinimumSize(SpdyMajorVersion version);
// Size, in bytes, of the control frame header.
static size_t GetControlFrameHeaderSize(SpdyMajorVersion version);
static size_t GetPrefixLength(SpdyFrameType type, SpdyMajorVersion version);
static size_t GetFrameMaximumSize(SpdyMajorVersion version);
// Returns the size of a header block size field. Valid only for SPDY 3.
static size_t GetSizeOfSizeField();
// Returns the size (in bytes) of a wire setting ID and value.
static size_t GetSettingSize(SpdyMajorVersion version);
// Initial window size for a stream in bytes.
static int32_t GetInitialStreamWindowSize(SpdyMajorVersion version);
// Initial window size for a session in bytes.
static int32_t GetInitialSessionWindowSize(SpdyMajorVersion version);
static SpdyMajorVersion ParseMajorVersion(int version_number);
static int SerializeMajorVersion(SpdyMajorVersion version);
static std::string GetVersionString(SpdyMajorVersion version);
};
class SpdyFrame;
typedef SpdyFrame SpdySerializedFrame;
class SpdyFrameVisitor;
// Intermediate representation for SPDY frames.
// TODO(hkhalil): Rename this class to SpdyFrame when the existing SpdyFrame is
// gone.
class NET_EXPORT_PRIVATE SpdyFrameIR {
public:
virtual ~SpdyFrameIR() {}
virtual void Visit(SpdyFrameVisitor* visitor) const = 0;
protected:
SpdyFrameIR() {}
private:
DISALLOW_COPY_AND_ASSIGN(SpdyFrameIR);
};
// Abstract class intended to be inherited by IRs that have a stream associated
// to them.
class NET_EXPORT_PRIVATE SpdyFrameWithStreamIdIR : public SpdyFrameIR {
public:
~SpdyFrameWithStreamIdIR() override {}
SpdyStreamId stream_id() const { return stream_id_; }
void set_stream_id(SpdyStreamId stream_id) {
DCHECK_EQ(0u, stream_id & ~kStreamIdMask);
stream_id_ = stream_id;
}
protected:
explicit SpdyFrameWithStreamIdIR(SpdyStreamId stream_id) {
set_stream_id(stream_id);
}
private:
SpdyStreamId stream_id_;
DISALLOW_COPY_AND_ASSIGN(SpdyFrameWithStreamIdIR);
};
// Abstract class intended to be inherited by IRs that have the option of a FIN
// flag. Implies SpdyFrameWithStreamIdIR.
class NET_EXPORT_PRIVATE SpdyFrameWithFinIR : public SpdyFrameWithStreamIdIR {
public:
~SpdyFrameWithFinIR() override {}
bool fin() const { return fin_; }
void set_fin(bool fin) { fin_ = fin; }
protected:
explicit SpdyFrameWithFinIR(SpdyStreamId stream_id)
: SpdyFrameWithStreamIdIR(stream_id),
fin_(false) {}
private:
bool fin_;
DISALLOW_COPY_AND_ASSIGN(SpdyFrameWithFinIR);
};
// Abstract class intended to be inherited by IRs that contain a header
// block. Implies SpdyFrameWithFinIR.
class NET_EXPORT_PRIVATE SpdyFrameWithHeaderBlockIR
: public NON_EXPORTED_BASE(SpdyFrameWithFinIR) {
public:
~SpdyFrameWithHeaderBlockIR() override;
const SpdyHeaderBlock& header_block() const { return header_block_; }
void set_header_block(const SpdyHeaderBlock& header_block) {
// Deep copy.
header_block_ = header_block;
}
void SetHeader(base::StringPiece name, base::StringPiece value) {
header_block_[name] = value;
}
SpdyHeaderBlock* mutable_header_block() { return &header_block_; }
protected:
explicit SpdyFrameWithHeaderBlockIR(SpdyStreamId stream_id);
private:
SpdyHeaderBlock header_block_;
DISALLOW_COPY_AND_ASSIGN(SpdyFrameWithHeaderBlockIR);
};
class NET_EXPORT_PRIVATE SpdyDataIR
: public NON_EXPORTED_BASE(SpdyFrameWithFinIR) {
public:
// Performs deep copy on data.
SpdyDataIR(SpdyStreamId stream_id, base::StringPiece data);
// Use in conjunction with SetDataShallow() for shallow-copy on data.
explicit SpdyDataIR(SpdyStreamId stream_id);
~SpdyDataIR() override;
base::StringPiece data() const { return data_; }
bool padded() const { return padded_; }
int padding_payload_len() const { return padding_payload_len_; }
void set_padding_len(int padding_len) {
DCHECK_GT(padding_len, 0);
DCHECK_LE(padding_len, kPaddingSizePerFrame);
padded_ = true;
// The pad field takes one octet on the wire.
padding_payload_len_ = padding_len - 1;
}
// Deep-copy of data (keep private copy).
void SetDataDeep(base::StringPiece data) {
data_store_.reset(new std::string(data.data(), data.length()));
data_ = *(data_store_.get());
}
// Shallow-copy of data (do not keep private copy).
void SetDataShallow(base::StringPiece data) {
data_store_.reset();
data_ = data;
}
void Visit(SpdyFrameVisitor* visitor) const override;
private:
// Used to store data that this SpdyDataIR should own.
scoped_ptr<std::string> data_store_;
base::StringPiece data_;
bool padded_;
// padding_payload_len_ = desired padding length - len(padding length field).
int padding_payload_len_;
DISALLOW_COPY_AND_ASSIGN(SpdyDataIR);
};
class NET_EXPORT_PRIVATE SpdySynStreamIR : public SpdyFrameWithHeaderBlockIR {
public:
explicit SpdySynStreamIR(SpdyStreamId stream_id)
: SpdyFrameWithHeaderBlockIR(stream_id),
associated_to_stream_id_(0),
priority_(0),
unidirectional_(false) {}
SpdyStreamId associated_to_stream_id() const {
return associated_to_stream_id_;
}
void set_associated_to_stream_id(SpdyStreamId stream_id) {
associated_to_stream_id_ = stream_id;
}
SpdyPriority priority() const { return priority_; }
void set_priority(SpdyPriority priority) { priority_ = priority; }
bool unidirectional() const { return unidirectional_; }
void set_unidirectional(bool unidirectional) {
unidirectional_ = unidirectional;
}
void Visit(SpdyFrameVisitor* visitor) const override;
private:
SpdyStreamId associated_to_stream_id_;
SpdyPriority priority_;
bool unidirectional_;
DISALLOW_COPY_AND_ASSIGN(SpdySynStreamIR);
};
class NET_EXPORT_PRIVATE SpdySynReplyIR : public SpdyFrameWithHeaderBlockIR {
public:
explicit SpdySynReplyIR(SpdyStreamId stream_id)
: SpdyFrameWithHeaderBlockIR(stream_id) {}
void Visit(SpdyFrameVisitor* visitor) const override;
private:
DISALLOW_COPY_AND_ASSIGN(SpdySynReplyIR);
};
class NET_EXPORT_PRIVATE SpdyRstStreamIR : public SpdyFrameWithStreamIdIR {
public:
SpdyRstStreamIR(SpdyStreamId stream_id, SpdyRstStreamStatus status);
~SpdyRstStreamIR() override;
SpdyRstStreamStatus status() const {
return status_;
}
void set_status(SpdyRstStreamStatus status) {
status_ = status;
}
void Visit(SpdyFrameVisitor* visitor) const override;
private:
SpdyRstStreamStatus status_;
DISALLOW_COPY_AND_ASSIGN(SpdyRstStreamIR);
};
class NET_EXPORT_PRIVATE SpdySettingsIR : public SpdyFrameIR {
public:
// Associates flags with a value.
struct Value {
Value() : persist_value(false),
persisted(false),
value(0) {}
bool persist_value;
bool persisted;
int32_t value;
};
typedef std::map<SpdySettingsIds, Value> ValueMap;
SpdySettingsIR();
~SpdySettingsIR() override;
// Overwrites as appropriate.
const ValueMap& values() const { return values_; }
void AddSetting(SpdySettingsIds id,
bool persist_value,
bool persisted,
int32_t value) {
values_[id].persist_value = persist_value;
values_[id].persisted = persisted;
values_[id].value = value;
}
bool clear_settings() const { return clear_settings_; }
bool is_ack() const { return is_ack_; }
void set_is_ack(bool is_ack) {
is_ack_ = is_ack;
}
void Visit(SpdyFrameVisitor* visitor) const override;
private:
ValueMap values_;
bool clear_settings_;
bool is_ack_;
DISALLOW_COPY_AND_ASSIGN(SpdySettingsIR);
};
class NET_EXPORT_PRIVATE SpdyPingIR : public SpdyFrameIR {
public:
explicit SpdyPingIR(SpdyPingId id) : id_(id), is_ack_(false) {}
SpdyPingId id() const { return id_; }
// ACK logic is valid only for SPDY versions 4 and above.
bool is_ack() const { return is_ack_; }
void set_is_ack(bool is_ack) { is_ack_ = is_ack; }
void Visit(SpdyFrameVisitor* visitor) const override;
private:
SpdyPingId id_;
bool is_ack_;
DISALLOW_COPY_AND_ASSIGN(SpdyPingIR);
};
class NET_EXPORT_PRIVATE SpdyGoAwayIR : public SpdyFrameIR {
public:
SpdyGoAwayIR(SpdyStreamId last_good_stream_id,
SpdyGoAwayStatus status,
base::StringPiece description);
~SpdyGoAwayIR() override;
SpdyStreamId last_good_stream_id() const { return last_good_stream_id_; }
void set_last_good_stream_id(SpdyStreamId last_good_stream_id) {
DCHECK_LE(0u, last_good_stream_id);
DCHECK_EQ(0u, last_good_stream_id & ~kStreamIdMask);
last_good_stream_id_ = last_good_stream_id;
}
SpdyGoAwayStatus status() const { return status_; }
void set_status(SpdyGoAwayStatus status) {
// TODO(hkhalil): Check valid ranges of status?
status_ = status;
}
const base::StringPiece& description() const { return description_; }
void Visit(SpdyFrameVisitor* visitor) const override;
private:
SpdyStreamId last_good_stream_id_;
SpdyGoAwayStatus status_;
const base::StringPiece description_;
DISALLOW_COPY_AND_ASSIGN(SpdyGoAwayIR);
};
class NET_EXPORT_PRIVATE SpdyHeadersIR : public SpdyFrameWithHeaderBlockIR {
public:
explicit SpdyHeadersIR(SpdyStreamId stream_id)
: SpdyFrameWithHeaderBlockIR(stream_id) {}
void Visit(SpdyFrameVisitor* visitor) const override;
bool has_priority() const { return has_priority_; }
void set_has_priority(bool has_priority) { has_priority_ = has_priority; }
uint32_t priority() const { return priority_; }
void set_priority(SpdyPriority priority) { priority_ = priority; }
SpdyStreamId parent_stream_id() const { return parent_stream_id_; }
void set_parent_stream_id(SpdyStreamId id) { parent_stream_id_ = id; }
bool exclusive() const { return exclusive_; }
void set_exclusive(bool exclusive) { exclusive_ = exclusive; }
bool padded() const { return padded_; }
int padding_payload_len() const { return padding_payload_len_; }
void set_padding_len(int padding_len) {
DCHECK_GT(padding_len, 0);
DCHECK_LE(padding_len, kPaddingSizePerFrame);
padded_ = true;
// The pad field takes one octet on the wire.
padding_payload_len_ = padding_len - 1;
}
private:
bool has_priority_ = false;
// 31-bit priority.
uint32_t priority_ = 0;
SpdyStreamId parent_stream_id_ = 0;
bool exclusive_ = false;
bool padded_ = false;
int padding_payload_len_ = 0;
DISALLOW_COPY_AND_ASSIGN(SpdyHeadersIR);
};
class NET_EXPORT_PRIVATE SpdyWindowUpdateIR : public SpdyFrameWithStreamIdIR {
public:
SpdyWindowUpdateIR(SpdyStreamId stream_id, int32_t delta)
: SpdyFrameWithStreamIdIR(stream_id) {
set_delta(delta);
}
int32_t delta() const { return delta_; }
void set_delta(int32_t delta) {
DCHECK_LT(0, delta);
DCHECK_LE(delta, kSpdyMaximumWindowSize);
delta_ = delta;
}
void Visit(SpdyFrameVisitor* visitor) const override;
private:
int32_t delta_;
DISALLOW_COPY_AND_ASSIGN(SpdyWindowUpdateIR);
};
class NET_EXPORT_PRIVATE SpdyBlockedIR
: public NON_EXPORTED_BASE(SpdyFrameWithStreamIdIR) {
public:
explicit SpdyBlockedIR(SpdyStreamId stream_id)
: SpdyFrameWithStreamIdIR(stream_id) {}
void Visit(SpdyFrameVisitor* visitor) const override;
private:
DISALLOW_COPY_AND_ASSIGN(SpdyBlockedIR);
};
class NET_EXPORT_PRIVATE SpdyPushPromiseIR : public SpdyFrameWithHeaderBlockIR {
public:
SpdyPushPromiseIR(SpdyStreamId stream_id, SpdyStreamId promised_stream_id)
: SpdyFrameWithHeaderBlockIR(stream_id),
promised_stream_id_(promised_stream_id),
padded_(false),
padding_payload_len_(0) {}
SpdyStreamId promised_stream_id() const { return promised_stream_id_; }
void Visit(SpdyFrameVisitor* visitor) const override;
bool padded() const { return padded_; }
int padding_payload_len() const { return padding_payload_len_; }
void set_padding_len(int padding_len) {
DCHECK_GT(padding_len, 0);
DCHECK_LE(padding_len, kPaddingSizePerFrame);
padded_ = true;
// The pad field takes one octet on the wire.
padding_payload_len_ = padding_len - 1;
}
private:
SpdyStreamId promised_stream_id_;
bool padded_;
int padding_payload_len_;
DISALLOW_COPY_AND_ASSIGN(SpdyPushPromiseIR);
};
// TODO(jgraettinger): This representation needs review. SpdyContinuationIR
// needs to frame a portion of a single, arbitrarily-broken encoded buffer.
class NET_EXPORT_PRIVATE SpdyContinuationIR
: public SpdyFrameWithHeaderBlockIR {
public:
explicit SpdyContinuationIR(SpdyStreamId stream_id)
: SpdyFrameWithHeaderBlockIR(stream_id), end_headers_(false) {}
void Visit(SpdyFrameVisitor* visitor) const override;
bool end_headers() const { return end_headers_; }
void set_end_headers(bool end_headers) {end_headers_ = end_headers;}
private:
bool end_headers_;
DISALLOW_COPY_AND_ASSIGN(SpdyContinuationIR);
};
class NET_EXPORT_PRIVATE SpdyAltSvcIR : public SpdyFrameWithStreamIdIR {
public:
explicit SpdyAltSvcIR(SpdyStreamId stream_id);
~SpdyAltSvcIR() override;
std::string origin() const { return origin_; }
const SpdyAltSvcWireFormat::AlternativeServiceVector& altsvc_vector() const {
return altsvc_vector_;
}
void set_origin(const std::string& origin) { origin_ = origin; }
void add_altsvc(const SpdyAltSvcWireFormat::AlternativeService& altsvc) {
altsvc_vector_.push_back(altsvc);
}
void Visit(SpdyFrameVisitor* visitor) const override;
private:
std::string origin_;
SpdyAltSvcWireFormat::AlternativeServiceVector altsvc_vector_;
DISALLOW_COPY_AND_ASSIGN(SpdyAltSvcIR);
};
class NET_EXPORT_PRIVATE SpdyPriorityIR : public SpdyFrameWithStreamIdIR {
public:
explicit SpdyPriorityIR(SpdyStreamId stream_id)
: SpdyFrameWithStreamIdIR(stream_id),
parent_stream_id_(0),
weight_(1),
exclusive_(false) {}
SpdyPriorityIR(SpdyStreamId stream_id,
SpdyStreamId parent_stream_id,
uint8_t weight,
bool exclusive)
: SpdyFrameWithStreamIdIR(stream_id),
parent_stream_id_(parent_stream_id),
weight_(weight),
exclusive_(exclusive) {}
SpdyStreamId parent_stream_id() const { return parent_stream_id_; }
void set_parent_stream_id(SpdyStreamId id) { parent_stream_id_ = id; }
uint8_t weight() const { return weight_; }
void set_weight(uint8_t weight) { weight_ = weight; }
bool exclusive() const { return exclusive_; }
void set_exclusive(bool exclusive) { exclusive_ = exclusive; }
void Visit(SpdyFrameVisitor* visitor) const override;
private:
SpdyStreamId parent_stream_id_;
uint8_t weight_;
bool exclusive_;
DISALLOW_COPY_AND_ASSIGN(SpdyPriorityIR);
};
// -------------------------------------------------------------------------
// Wrapper classes for various SPDY frames.
// All Spdy Frame types derive from this SpdyFrame class.
class SpdyFrame {
public:
// Create a SpdyFrame using a pre-created buffer.
// If |owns_buffer| is true, this class takes ownership of the buffer
// and will delete it on cleanup. The buffer must have been created using
// new char[].
// If |owns_buffer| is false, the caller retains ownership of the buffer and
// is responsible for making sure the buffer outlives this frame. In other
// words, this class does NOT create a copy of the buffer.
SpdyFrame(char* data, size_t size, bool owns_buffer)
: frame_(data),
size_(size),
owns_buffer_(owns_buffer) {
DCHECK(frame_);
}
~SpdyFrame() {
if (owns_buffer_) {
delete [] frame_;
}
frame_ = NULL;
}
// Provides access to the frame bytes, which is a buffer containing
// the frame packed as expected for sending over the wire.
char* data() const { return frame_; }
// Returns the actual size of the underlying buffer.
size_t size() const { return size_; }
protected:
char* frame_;
private:
size_t size_;
bool owns_buffer_;
DISALLOW_COPY_AND_ASSIGN(SpdyFrame);
};
// This interface is for classes that want to process SpdyFrameIRs without
// having to know what type they are. An instance of this interface can be
// passed to a SpdyFrameIR's Visit method, and the appropriate type-specific
// method of this class will be called.
class SpdyFrameVisitor {
public:
virtual void VisitSynStream(const SpdySynStreamIR& syn_stream) = 0;
virtual void VisitSynReply(const SpdySynReplyIR& syn_reply) = 0;
virtual void VisitRstStream(const SpdyRstStreamIR& rst_stream) = 0;
virtual void VisitSettings(const SpdySettingsIR& settings) = 0;
virtual void VisitPing(const SpdyPingIR& ping) = 0;
virtual void VisitGoAway(const SpdyGoAwayIR& goaway) = 0;
virtual void VisitHeaders(const SpdyHeadersIR& headers) = 0;
virtual void VisitWindowUpdate(const SpdyWindowUpdateIR& window_update) = 0;
virtual void VisitBlocked(const SpdyBlockedIR& blocked) = 0;
virtual void VisitPushPromise(const SpdyPushPromiseIR& push_promise) = 0;
virtual void VisitContinuation(const SpdyContinuationIR& continuation) = 0;
virtual void VisitAltSvc(const SpdyAltSvcIR& altsvc) = 0;
virtual void VisitPriority(const SpdyPriorityIR& priority) = 0;
virtual void VisitData(const SpdyDataIR& data) = 0;
protected:
SpdyFrameVisitor() {}
virtual ~SpdyFrameVisitor() {}
private:
DISALLOW_COPY_AND_ASSIGN(SpdyFrameVisitor);
};
} // namespace net
#endif // NET_SPDY_SPDY_PROTOCOL_H_