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annotate src/luan/modules/http/LuanHandler.java @ 1806:3b7a8f1cc887 default tip

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update discord
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 09 May 2024 20:39:53 -0600
parents 9157e0d5936e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
1 package luan.modules.http;
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2
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3 import java.io.Closeable;
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4 import java.io.Writer;
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5 import java.io.PrintWriter;
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6 import java.io.IOException;
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7 import java.lang.ref.Reference;
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8 import java.lang.ref.WeakReference;
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9 import java.lang.reflect.Method;
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10 import java.net.BindException;
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11 import java.util.List;
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12 import java.util.ArrayList;
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13 import java.util.concurrent.locks.ReadWriteLock;
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14 import java.util.concurrent.locks.ReentrantReadWriteLock;
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15 import goodjava.logging.Logger;
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16 import goodjava.logging.LoggerFactory;
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17 import goodjava.webserver.Request;
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18 import goodjava.webserver.Response;
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19 import goodjava.webserver.Status;
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20 import goodjava.webserver.Server;
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21 import goodjava.webserver.Handler;
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22 import goodjava.webserver.ResponseOutputStream;
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23 import luan.Luan;
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24 import luan.LuanTable;
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25 import luan.LuanFunction;
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26 import luan.LuanJavaFunction;
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27 import luan.LuanException;
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28 import luan.modules.PackageLuan;
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29 import luan.modules.BasicLuan;
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30 import luan.modules.ThreadLuan;
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31 import luan.modules.logging.LuanLogger;
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33
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34 public final class LuanHandler implements Handler, Closeable {
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35 private static final Logger logger = LoggerFactory.getLogger(LuanHandler.class);
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36
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37 private final Luan luanInit;
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38 public final String domain;
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39 private final ReadWriteLock rwLock = new ReentrantReadWriteLock();
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40 private volatile Luan currentLuan;
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41 private volatile boolean isDisabled = false;
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42 private volatile boolean didInit;
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43 private final List<Closeable> closeables = new ArrayList<Closeable>();
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44
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45 private static final Method resetLuanMethod;
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46 private static final Method evalInRootMethod;
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47 private static final Method disableLuanMethod;
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48 private static final Method testAsInitMethod;
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49 static {
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50 try {
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51 resetLuanMethod = LuanHandler.Fns.class.getMethod( "reset_luan" );
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52 evalInRootMethod = LuanHandler.Fns.class.getMethod( "eval_in_root", String.class );
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53 disableLuanMethod = LuanHandler.Fns.class.getMethod( "disable_luan" );
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54 testAsInitMethod = LuanHandler.Fns.class.getMethod( "test_as_init", String.class, String.class );
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55 } catch(NoSuchMethodException e) {
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56 throw new RuntimeException(e);
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57 }
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58 }
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59
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60 public LuanHandler(Luan luanInit,String domain) {
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61 this.luanInit = luanInit;
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62 this.domain = domain;
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63 Fns fns = new Fns(this);
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64 try {
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65 LuanTable Http = (LuanTable)luanInit.require("luan:http/Http.luan");
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66 if( Http.get(luanInit,"reset_luan") == null )
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67 Http.put( luanInit, "reset_luan", new LuanJavaFunction(resetLuanMethod,fns) );
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68 Http.put( luanInit, "eval_in_root", new LuanJavaFunction(evalInRootMethod,fns) );
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69 Http.put( luanInit, "disable_luan", new LuanJavaFunction(disableLuanMethod,fns) );
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70 Http.put( luanInit, "test_as_init", new LuanJavaFunction(testAsInitMethod,fns) );
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71 } catch(LuanException e) {
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72 throw new RuntimeException(e);
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73 }
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74 if( luanInit.registry().get(ThreadLuan.CLOSEABLES) != null )
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75 throw new RuntimeException(ThreadLuan.CLOSEABLES+" already set");
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76 luanInit.registry().put(ThreadLuan.CLOSEABLES,fns);
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77 if( domain != null )
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78 logger.warn("new "+domain);
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79 newLuan();
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80 }
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81
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82 protected void finalize() throws Throwable {
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83 if( domain != null )
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84 logger.warn("gc "+domain);
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85 }
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86
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87 private void init(Luan luan) throws LuanException {
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88 if( didInit )
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89 return;
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90 PackageLuan.load(luan,"site:/init.luan",null);
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91 didInit = true;
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92 }
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93
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94 private void newLuan() {
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95 Luan luan;
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96 synchronized(luanInit) {
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97 luan = new Luan(luanInit);
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98 }
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99 didInit = false;
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100 LuanLogger.startThreadLogging(luan);
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101 try {
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102 init(luan);
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103 } catch(LuanException e) {
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104 //e.printStackTrace();
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105 String err = e.getLuanStackTraceString();
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106 logger.error(err);
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107 } finally {
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108 LuanLogger.endThreadLogging();
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109 }
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110 currentLuan = luan;
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111 }
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112
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113 static final String NOT_FOUND = "luan-not-found";
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114
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115 @Override public Response handle(Request request) {
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116 if( isDisabled )
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117 return null;
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118 boolean notFound = request.headers.containsKey(NOT_FOUND);
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119 if( !notFound && request.path.endsWith("/") )
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120 return null;
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121 return handle( request, notFound );
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122 }
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123
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124 private Response handle(Request request,boolean notFound) {
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125 Thread thread = Thread.currentThread();
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126 String oldName = thread.getName();
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127 thread.setName(request.headers.get("host")+request.path);
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128 rwLock.readLock().lock();
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129 LuanLogger.startThreadLogging(currentLuan);
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130 try {
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131 init(currentLuan);
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132 return service(request,notFound);
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133 } catch(LuanException e) {
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134 String err = e.getLuanStackTraceString();
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135 //System.err.println(err);
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136 logger.error(err+"\n"+request.rawHead.trim()+"\n");
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137 String msg = "Internel Server Error\n\n" + err;
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138 return Response.errorResponse( Status.INTERNAL_SERVER_ERROR, msg );
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139 } finally {
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140 LuanLogger.endThreadLogging();
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141 rwLock.readLock().unlock();
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142 thread.setName(oldName);
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143 }
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144 }
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145
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146 @Override public void close() {
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147 synchronized(closeables) {
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148 for( Closeable c : closeables ) {
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149 try {
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150 c.close();
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151 } catch(IOException e) {
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152 logger.error(c.toString(),e);
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153 }
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154 }
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155 closeables.clear();
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156 }
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157 }
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158
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159 public Object call_rpc(String fnName,Object... args) throws LuanException {
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160 rwLock.readLock().lock();
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161 LuanLogger.startThreadLogging(currentLuan);
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162 try {
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163 LuanFunction fn;
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164 Luan luan;
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165 synchronized(currentLuan) {
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166 LuanTable rpc = (LuanTable)currentLuan.require("luan:Rpc.luan");
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167 LuanTable fns = (LuanTable)rpc.get(currentLuan,"functions");
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168 fn = (LuanFunction)fns.get(currentLuan,fnName);
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169 if( fn == null )
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170 throw new LuanException( "function not found: " + fnName );
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171 luan = new Luan(currentLuan);
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172 }
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173 return fn.call(luan,args);
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174 } finally {
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175 LuanLogger.endThreadLogging();
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176 rwLock.readLock().unlock();
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177 }
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178 }
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179
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180 private void test_as_init(String text,String sourceName) throws LuanException {
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181 Luan luan;
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182 synchronized(luanInit) {
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183 luan = new Luan(luanInit);
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184 }
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185 LuanLogger.startThreadLogging(luan);
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186 try {
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187 luan.load(text,sourceName,false,null).call(luan);
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188 } finally {
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189 LuanLogger.endThreadLogging();
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190 }
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191 }
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192
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193 public static void start(Server server) throws Exception {
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194 try {
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195 server.start();
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196 } catch(BindException e) {
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197 throw new LuanException(e.toString());
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198 }
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199 }
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200
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201 private void reset_luan() {
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202 new Thread() {public void run(){
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203 rwLock.writeLock().lock();
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204 try {
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205 close();
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206 newLuan();
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207 } finally {
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208 rwLock.writeLock().unlock();
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209 }
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210 }}.start();
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211 }
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212
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213 private void disable_luan() {
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214 isDisabled = true;
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215 }
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216
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217 private void eval_in_root(String text) throws LuanException {
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218 synchronized(currentLuan) {
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219 currentLuan.load(text,"<eval_in_root>",false,null).call(currentLuan);
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220 }
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221 }
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222
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223 public static final class Fns implements ThreadLuan.Closeables {
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224 private final Reference<LuanHandler> ref;
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225
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226 private Fns(LuanHandler lh) {
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diff changeset
227 this.ref = new WeakReference<LuanHandler>(lh);
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228 }
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229
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230 private LuanHandler lh() throws LuanException {
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231 LuanHandler lh = ref.get();
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232 if( lh == null )
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233 throw new LuanException("HTTP handler has been garbage collected");
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234 return lh;
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235 }
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236
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diff changeset
237 @Override public void addCloseable(Closeable c) throws LuanException {
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238 List<Closeable> closeables = lh().closeables;
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239 synchronized(closeables) {
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240 closeables.add(c);
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241 }
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242 }
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243
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244 public void reset_luan() throws LuanException {
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245 lh().reset_luan();
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246 }
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247
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diff changeset
248 public void disable_luan() throws LuanException {
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249 lh().disable_luan();
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250 }
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251
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diff changeset
252 public void eval_in_root(String text) throws LuanException {
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253 lh().eval_in_root(text);
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254 }
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255
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256 public void test_as_init(String text,String sourceName) throws LuanException {
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diff changeset
257 lh().test_as_init(text,sourceName);
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258 }
1004
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259 }
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260
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261
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diff changeset
262 // from HttpServicer
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263
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diff changeset
264 private Response service(Request request,boolean notFound)
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265 throws LuanException
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266 {
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267 try {
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268 if( !notFound )
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269 return serviceLuan(request);
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270 else
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271 return serviceNotFound(request);
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diff changeset
272 } catch(LuanException e) {
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273 return handleError(request,e);
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274 }
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275 }
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276
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diff changeset
277 private Response handleError(Request request,LuanException e)
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diff changeset
278 throws LuanException
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diff changeset
279 {
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diff changeset
280 //e.printStackTrace();
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diff changeset
281 Luan luan;
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diff changeset
282 synchronized(currentLuan) {
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diff changeset
283 luan = new Luan(currentLuan);
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284 }
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diff changeset
285 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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diff changeset
286 return (Response)module.fn(luan,"handle_error").call( luan, request, e.table(luan) );
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diff changeset
287 }
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288
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289 private Response serviceLuan(Request request)
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290 throws LuanException
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diff changeset
291 {
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diff changeset
292 String modName = "site:" + request.path +".luan";
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diff changeset
293 LuanFunction fn;
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diff changeset
294 Luan luan;
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diff changeset
295 synchronized(currentLuan) {
1644
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diff changeset
296 currentLuan.require("luan:http/Http.luan");
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diff changeset
297 Object mod = PackageLuan.load(currentLuan,modName,null);
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diff changeset
298 if( mod.equals(Boolean.FALSE) )
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299 return null;
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diff changeset
300 if( !(mod instanceof LuanFunction) )
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diff changeset
301 throw new LuanException( "module '"+modName+"' must return a function" );
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diff changeset
302 luan = new Luan(currentLuan);
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diff changeset
303 fn = (LuanFunction)mod;
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304 }
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diff changeset
305 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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306 module.fn(luan,"new_request").call(luan,request);
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307 module.fn(luan,"new_response").call(luan);
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308 fn.call(luan);
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309 return (Response)module.fn(luan,"finish").call(luan);
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310 }
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311
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312 private Response serviceNotFound(Request request)
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313 throws LuanException
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314 {
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315 LuanFunction fn;
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316 Luan luan;
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317 synchronized(currentLuan) {
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318 LuanTable module = (LuanTable)currentLuan.require("luan:http/Http.luan");
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319 fn = module.fn(currentLuan,"not_found_handler");
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320 if( fn == null )
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321 return null;
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322 luan = new Luan(currentLuan);
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323 }
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324 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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325 module.fn(luan,"new_request").call(luan,request);
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326 module.fn(luan,"new_response").call(luan);
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327 Object obj = Luan.first(fn.call(luan));
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328 if( !(obj instanceof Boolean) )
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329 throw new LuanException("not_found_handler must return boolean");
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330 boolean handled = (Boolean)obj;
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331 return handled ? (Response)module.fn(luan,"finish").call(luan) : null;
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332 }
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333
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334 }