blob: 4468638dc409aa18cdd5096aa38fb2798d72b1cb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
// Copyright 2015 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.
#ifndef BLIMP_NET_STREAM_PACKET_READER_H_
#define BLIMP_NET_STREAM_PACKET_READER_H_
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "blimp/net/blimp_net_export.h"
#include "blimp/net/packet_reader.h"
#include "net/base/completion_callback.h"
#include "net/base/net_errors.h"
namespace net {
class GrowableIOBuffer;
class StreamSocket;
} // namespace net
namespace blimp {
// Reads opaque length-prefixed packets of bytes from a StreamSocket.
// The header segment is 32-bit, encoded in network byte order.
// The body segment length is specified in the header (capped at
// kMaxPacketPayloadSizeBytes).
class BLIMP_NET_EXPORT StreamPacketReader : public PacketReader {
public:
// |socket|: The socket to read packets from. The caller must ensure |socket|
// is valid while the reader is in-use (see ReadPacket below).
explicit StreamPacketReader(net::StreamSocket* socket);
~StreamPacketReader() override;
// PacketReader implementation.
int ReadPacket(const scoped_refptr<net::GrowableIOBuffer>& buf,
const net::CompletionCallback& cb) override;
private:
enum class ReadState {
IDLE,
HEADER,
PAYLOAD,
};
friend std::ostream& operator<<(std::ostream& out, const ReadState state);
// State machine implementation.
// |result| - the result value of the most recent network operation.
// See comments for ReadPacket() for documentation on return values.
int DoReadLoop(int result);
// Reads the header and parses it when, done, to get the payload size.
int DoReadHeader(int result);
// Reads payload bytes until the payload is complete.
int DoReadPayload(int result);
// Processes an asynchronous header or payload read, and invokes |callback_|
// on packet read completion.
void OnReadComplete(int result);
ReadState read_state_;
net::StreamSocket* socket_;
// The size of the payload, in bytes.
size_t payload_size_;
scoped_refptr<net::GrowableIOBuffer> header_buffer_;
scoped_refptr<net::GrowableIOBuffer> payload_buffer_;
net::CompletionCallback callback_;
base::WeakPtrFactory<StreamPacketReader> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(StreamPacketReader);
};
} // namespace blimp
#endif // BLIMP_NET_STREAM_PACKET_READER_H_
|
