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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
package org.jetbrains.io.fastCgi;
import com.intellij.util.Consumer;
import gnu.trove.TIntObjectHashMap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.CompositeByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.CharsetUtil;
import org.jetbrains.io.Decoder;
import static org.jetbrains.io.fastCgi.FastCgiService.LOG;
public class FastCgiDecoder extends Decoder {
private enum State {
HEADER, CONTENT
}
private State state = State.HEADER;
private enum ProtocolStatus {
REQUEST_COMPLETE, CANT_MPX_CONN, OVERLOADED, UNKNOWN_ROLE
}
public static final class RecordType {
public static final int END_REQUEST = 3;
public static final int STDOUT = 6;
public static final int STDERR = 7;
}
private int type;
private int id;
private int contentLength;
private int paddingLength;
private final TIntObjectHashMap<ByteBuf> dataBuffers = new TIntObjectHashMap<ByteBuf>();
private final Consumer<String> errorOutputConsumer;
public FastCgiDecoder(Consumer<String> errorOutputConsumer) {
this.errorOutputConsumer = errorOutputConsumer;
}
@Override
protected void messageReceived(ChannelHandlerContext context, ByteBuf input) throws Exception {
while (true) {
switch (state) {
case HEADER: {
if (paddingLength > 0) {
if (input.readableBytes() >= paddingLength) {
input.skipBytes(paddingLength);
paddingLength = 0;
}
else {
paddingLength -= input.readableBytes();
input.skipBytes(input.readableBytes());
input.release();
return;
}
}
ByteBuf buffer = getBufferIfSufficient(input, FastCgiConstants.HEADER_LENGTH, context);
if (buffer == null) {
input.release();
return;
}
decodeHeader(buffer);
state = State.CONTENT;
}
case CONTENT: {
if (contentLength > 0) {
ByteBuf buffer = getBufferIfSufficient(input, contentLength, context);
if (buffer == null) {
input.release();
return;
}
FastCgiResponse response = readContent(buffer);
if (response != null) {
context.fireChannelRead(response);
}
}
state = State.HEADER;
}
}
}
}
private void decodeHeader(ByteBuf buffer) {
buffer.skipBytes(1);
type = buffer.readUnsignedByte();
id = buffer.readUnsignedShort();
contentLength = buffer.readUnsignedShort();
paddingLength = buffer.readUnsignedByte();
buffer.skipBytes(1);
}
private FastCgiResponse readContent(ByteBuf buffer) {
switch (type) {
case RecordType.END_REQUEST:
int appStatus = buffer.readInt();
int protocolStatus = buffer.readUnsignedByte();
buffer.skipBytes(3);
if (appStatus != 0 || protocolStatus != ProtocolStatus.REQUEST_COMPLETE.ordinal()) {
LOG.warn("Protocol status " + protocolStatus);
dataBuffers.remove(id);
return new FastCgiResponse(id, null);
}
else if (protocolStatus == ProtocolStatus.REQUEST_COMPLETE.ordinal()) {
return new FastCgiResponse(id, dataBuffers.remove(id));
}
break;
case RecordType.STDOUT:
ByteBuf data = dataBuffers.get(id);
ByteBuf sliced = buffer.slice(buffer.readerIndex(), contentLength);
if (data == null) {
dataBuffers.put(id, sliced);
}
else if (data instanceof CompositeByteBuf) {
((CompositeByteBuf)data).addComponent(sliced);
data.writerIndex(data.writerIndex() + sliced.readableBytes());
}
else {
dataBuffers.put(id, Unpooled.wrappedBuffer(data, sliced));
}
sliced.retain();
buffer.skipBytes(contentLength);
break;
case RecordType.STDERR:
try {
errorOutputConsumer.consume(buffer.toString(buffer.readerIndex(), contentLength, CharsetUtil.UTF_8));
}
catch (Throwable e) {
LOG.error(e);
}
buffer.skipBytes(contentLength);
break;
default:
LOG.error("Unknown type " + type);
break;
}
return null;
}
}
|
