-
Notifications
You must be signed in to change notification settings - Fork 37
/
PixelClientHandler.java
191 lines (165 loc) · 4.94 KB
/
PixelClientHandler.java
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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
package de.paws.pixelwar;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.commons.lang3.StringUtils;
public class PixelClientHandler extends SimpleChannelInboundHandler<String> {
public interface CommandHandler {
public void handle(PixelClientHandler client, String[] args);
}
private static Set<PixelClientHandler> clients = new HashSet<>();
private final NetCanvas canvas;
private ChannelHandlerContext channelContext;
private final Set<String> subscriptions = new HashSet<>();
private final Map<String, CommandHandler> handlers = new HashMap<>();
private Label label;
public PixelClientHandler(final NetCanvas canvas) {
this.canvas = canvas;
}
public void installHandler(final String command,
final CommandHandler handler) {
handlers.put(command.toUpperCase(), handler);
}
@Override
public void channelActive(final ChannelHandlerContext ctx) throws Exception {
super.channelActive(ctx);
label = new Label();
label.setText(ctx.channel().remoteAddress().toString());
canvas.addDrawable(label);
channelContext = ctx;
synchronized (clients) {
clients.add(this);
}
}
@Override
public void channelInactive(final ChannelHandlerContext ctx)
throws Exception {
super.channelActive(ctx);
synchronized (clients) {
clients.remove(this);
}
label.setAlive(false);
}
public void writeIfPossible(final String str) {
if (channelContext.channel().isWritable()) {
channelContext.write(str + "\n");
channelContext.flush();
} else {
}
}
private void writeChannel(final String channel, final String message) {
if (subscriptions.contains(channel) || subscriptions.contains("*")) {
writeIfPossible(message);
}
}
public void write(final String str) {
channelContext.writeAndFlush(str + "\n");
}
public void error(final String msg) {
write("ERR " + msg + "\n");
channelContext.close();
}
@Override
protected void channelRead0(final ChannelHandlerContext ctx,
final String msg) throws Exception {
final int split = msg.indexOf(" ");
String command;
String data;
if (split == -1) {
command = msg.toUpperCase();
data = "";
} else {
command = msg.substring(0, split).toUpperCase();
data = msg.substring(split + 1).trim();
}
switch (command) {
case ("PX"):
handle_PX(ctx, data);
break;
case ("SIZE"):
handle_SIZE(ctx, data);
break;
case ("PUB"):
handle_PUB(ctx, data);
break;
case ("SUB"):
handle_SUB(ctx, data);
break;
case ("HELP"):
handle_HELP(ctx, data);
break;
default:
error("Unknown command");
}
}
private void handle_HELP(final ChannelHandlerContext ctx, final String data) {
writeIfPossible("HELP Commands:\n" + "HELP SIZE\n"
+ "HELP PX <x> <y>\n" + "HELP PX <x> <y> <rrggbb[aa]>\n"
+ "HELP SUB\n" + "HELP SUB [-]<channel>\n"
+ "HELP PUB <channel> <message>\n");
}
private void handle_SUB(final ChannelHandlerContext ctx, final String data) {
if (data.startsWith("-")) {
final String channel = data.substring(1);
if (!subscriptions.remove(channel.toLowerCase())) {
error("Not subscribed to this channel.");
}
} else if (data.length() > 0) {
final String channel = data.toLowerCase();
if (!channel.matches("^[a-zA-Z0-9_]+$")) {
error("Invalid channel name");
} else if (subscriptions.size() >= 16) {
error("Too many subscriptions");
} else {
subscriptions.add(channel);
}
}
write("SUB " + StringUtils.join(subscriptions, " "));
}
private void handle_PUB(final ChannelHandlerContext ctx, final String data) {
final String[] parts = data.split(" ", 2);
if (parts.length != 2) {
error("Usage: PUB <channel> <message>");
return;
}
final String channel = parts[0].toLowerCase();
final String message = "PUB " + channel + " " + parts[1].trim();
for (final PixelClientHandler c : clients) {
c.writeChannel(channel, message);
}
}
private void handle_SIZE(final ChannelHandlerContext ctx, final String data) {
if (data.length() > 0) {
error("SIZE");
}
write(String
.format("SIZE %d %d", canvas.getWidth(), canvas.getHeight()));
}
private void handle_PX(final ChannelHandlerContext ctx, final String data) {
final String[] args = data.split(" ");
try {
if (args.length == 2) {
final int x = Integer.parseInt(args[0]);
final int y = Integer.parseInt(args[1]);
final int c = canvas.getPixel(x, y);
write(String.format("PX %d %d %06x", x, y, c));
} else if (args.length == 3) {
final int x = Integer.parseInt(args[0]);
final int y = Integer.parseInt(args[1]);
int color = (int) Long.parseLong(args[2], 16);
if (args[2].length() == 6) {
color += 0xff000000;
}
label.setPos(x, y);
canvas.setPixel(x, y, color);
} else {
error("Usage: PX x y [rrggbb[aa]]");
}
} catch (final NumberFormatException e) {
error("Usage: PX x y [rrggbb[aa]]");
}
}
}