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annotate src/luan/modules/http/LuanHandler.java @ 1004:3fa54d9d19cd

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better handling of BindException
author Franklin Schmidt <fschmidt@gmail.com>
date Sat, 22 Oct 2016 23:00:57 -0600
parents 32d4b569567c
children 0d884377e923
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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2b9bc97f0439 change luan:web to luan:http
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1 package luan.modules.http;
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3 import java.io.IOException;
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4 import java.lang.reflect.Method;
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5 import java.net.BindException;
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6 import java.util.concurrent.locks.ReadWriteLock;
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7 import java.util.concurrent.locks.ReentrantReadWriteLock;
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8 import javax.servlet.http.HttpServletResponse;
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9 import org.slf4j.Logger;
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10 import org.slf4j.LoggerFactory;
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11 import org.eclipse.jetty.server.Request;
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12 import org.eclipse.jetty.server.Server;
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13 import org.eclipse.jetty.server.handler.AbstractHandler;
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14 import luan.Luan;
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15 import luan.LuanState;
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16 import luan.LuanTable;
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17 import luan.LuanFunction;
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18 import luan.LuanJavaFunction;
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19 import luan.LuanCloner;
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20 import luan.LuanException;
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21 import luan.modules.PackageLuan;
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24 public class LuanHandler extends AbstractHandler {
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25 private final LuanState luanInit;
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26 private final Logger logger;
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27 private String welcomeFile = "index.html";
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28 private final ReadWriteLock lock = new ReentrantReadWriteLock();
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29 private LuanState luan;
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30
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31 private static final Method resetLuanMethod;
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32 static {
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33 try {
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34 resetLuanMethod = LuanHandler.class.getMethod("reset_luan");
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35 } catch(NoSuchMethodException e) {
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36 throw new RuntimeException(e);
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37 }
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38 }
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39
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40 public LuanHandler(LuanState luan,String loggerRoot) {
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41 this.luanInit = luan;
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42 if( loggerRoot==null )
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43 loggerRoot = "";
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44 logger = LoggerFactory.getLogger(loggerRoot+LuanHandler.class.getName());
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45 try {
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46 LuanTable Http = (LuanTable)PackageLuan.require(luanInit,"luan:http/Http.luan");
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47 Http.rawPut( "reset_luan", new LuanJavaFunction(resetLuanMethod,this) );
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48 } catch(LuanException e) {
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49 throw new RuntimeException(e);
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50 }
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51 }
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52
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53 @Override
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54 public void handle(String target,Request request,HttpServletResponse response)
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55 throws IOException
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56 {
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57 //Thread.dumpStack();
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58 if( target.endsWith("/") )
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59 target += welcomeFile;
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60 Thread thread = Thread.currentThread();
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61 String oldName = thread.getName();
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62 thread.setName(request.getHeader("host")+request.getRequestURI());
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63 lock.readLock().lock();
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64 try {
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65 if( !HttpServicer.service(luan,request,response,"site:"+target+".luan") )
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66 return;
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67 } catch(LuanException e) {
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68 //e.printStackTrace();
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69 String err = e.getFullMessage();
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70 logger.error(err);
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71 response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,err);
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72 } finally {
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73 lock.readLock().unlock();
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74 thread.setName(oldName);
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75 }
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76 request.setHandled(true);
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77 }
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78
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79 public void setWelcomeFile(String welcomeFile) {
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80 this.welcomeFile = welcomeFile;
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81 }
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82
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83 @Override protected void doStart() throws Exception {
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84 // Thread.dumpStack();
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85 //System.out.println("qqqqqqqqqqqqqqqqqqqq doStart "+this);
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86 setLuan();
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87 super.doStart();
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88 }
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89
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90 @Override protected void doStop() throws Exception {
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91 synchronized(luan) {
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92 luan.close();
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93 }
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94 //System.out.println("qqqqqqqqqqqqqqqqqqqq doStop "+this);
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95 super.doStop();
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96 }
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97 /*
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98 @Override public void destroy() {
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99 System.out.println("qqqqqqqqqqqqqqqqqqqq destroy "+this);
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100 super.destroy();
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101 }
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102 */
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103
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104 public Object call_rpc(String fnName,Object... args) throws LuanException {
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105 lock.readLock().lock();
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106 try {
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107 LuanFunction fn;
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108 LuanState luan = this.luan;
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109 synchronized(luan) {
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110 PackageLuan.enableLoad(luan,"luan:Rpc.luan");
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111 LuanTable rpc = (LuanTable)PackageLuan.require(luan,"luan:Rpc.luan");
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112 LuanTable fns = (LuanTable)rpc.get(luan,"functions");
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113 fn = (LuanFunction)fns.get(luan,fnName);
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114 if( fn == null )
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115 throw new LuanException( "function not found: " + fnName );
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116 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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117 luan = (LuanState)cloner.clone(luan);
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118 fn = (LuanFunction)cloner.get(fn);
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119 }
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120 return fn.call(luan,args);
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121 } finally {
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122 lock.readLock().unlock();
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123 }
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124 }
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125
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126 public void reset_luan() {
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127 new Thread() {
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128 public void run() {
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129 lock.writeLock().lock();
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130 try {
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131 synchronized(luan) {
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132 luan.close();
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133 setLuan();
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134 }
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135 } catch(IOException e) {
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136 logger.error("reset_luan failed",e);
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137 } finally {
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138 lock.writeLock().unlock();
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139 }
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140 }
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141 }.start();
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142 }
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143
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144 private void setLuan() {
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145 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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146 luan = (LuanState)cloner.clone(luanInit);
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147 try {
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148 PackageLuan.load(luan,"site:/init.luan");
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149 } catch(LuanException e) {
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150 String err = e.getFullMessage();
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151 logger.error(err);
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152 }
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153 }
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154
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155 public Object runLuan(String sourceText,String sourceName) throws LuanException {
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156 LuanFunction fn = Luan.load(sourceText,sourceName);
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157 synchronized(luan) {
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158 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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159 LuanState luan = (LuanState)cloner.clone(this.luan);
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160 return fn.call(luan);
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161 }
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162 }
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163
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164 public static void start(Server server) throws Exception {
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165 try {
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166 server.start();
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167 } catch(BindException e) {
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168 throw new LuanException(e.toString());
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169 }
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170 }
175
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171 }