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annotate src/luan/modules/http/LuanHandler.java @ 1360:ee0f0e6c89a0

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fix reset_luan
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 21 Apr 2019 02:32:41 -0600
parents 9721d4709bfb
children 5c3702f60200
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 luan.lib.logging.Logger;
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16 import luan.lib.webserver.Request;
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17 import luan.lib.webserver.Response;
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18 import luan.lib.webserver.Status;
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19 import luan.lib.webserver.Server;
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20 import luan.lib.webserver.Handler;
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21 import luan.lib.webserver.ResponseOutputStream;
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22 import luan.Luan;
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23 import luan.LuanTable;
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24 import luan.LuanFunction;
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25 import luan.LuanJavaFunction;
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26 import luan.LuanCloner;
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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.logging.LuanLogger;
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32
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33 public final class LuanHandler implements Handler, Luan.OnClose {
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34 private final Luan luanInit;
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35 private final Logger logger;
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36 private final ReadWriteLock rwLock = new ReentrantReadWriteLock();
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37 private final List<Reference<Closeable>> onClose = new ArrayList<Reference<Closeable>>();
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38 private volatile Luan currentLuan;
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39 private volatile boolean isDisabled = false;
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40
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41 private static final Method resetLuanMethod;
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42 private static final Method evalInRootMethod;
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43 private static final Method disableLuanMethod;
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44 static {
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45 try {
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46 resetLuanMethod = LuanHandler.class.getMethod( "reset_luan" );
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47 evalInRootMethod = LuanHandler.class.getMethod( "eval_in_root", String.class );
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48 disableLuanMethod = LuanHandler.class.getMethod( "disable_luan" );
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49 } catch(NoSuchMethodException e) {
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50 throw new RuntimeException(e);
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51 }
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52 }
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53
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54 public LuanHandler(Luan luanInit) {
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55 this.luanInit = luanInit;
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56 this.logger = LuanLogger.getLogger(luanInit,LuanHandler.class.getName());
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57 try {
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58 LuanTable Http = (LuanTable)luanInit.require("luan:http/Http.luan");
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59 if( Http.get("reset_luan") == null )
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60 Http.put( "reset_luan", new LuanJavaFunction(luanInit,resetLuanMethod,this) );
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61 Http.put( "eval_in_root", new LuanJavaFunction(luanInit,evalInRootMethod,this) );
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62 Http.put( "disable_luan", new LuanJavaFunction(luanInit,disableLuanMethod,this) );
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63 } catch(LuanException e) {
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64 throw new RuntimeException(e);
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65 }
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66 currentLuan = newLuan();
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67 }
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68
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69 private Luan newLuan() {
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70 Luan luan;
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71 synchronized(luanInit) {
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72 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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73 luan = (Luan)cloner.clone(luanInit);
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74 }
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75 luan.onClose = this;
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76 try {
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77 PackageLuan.load(luan,"site:/init.luan");
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78 } catch(LuanException e) {
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79 //e.printStackTrace();
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80 String err = e.getLuanStackTraceString();
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81 logger.error(err);
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82 }
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83 return luan;
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84 }
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85
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86 /*
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87 public Luan getLuan() {
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88 return luan;
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89 }
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90 */
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91 @Override public Response handle(Request request) {
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92 if( isDisabled )
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93 return null;
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94 if( request.path.endsWith("/") )
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95 return null;
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96 return handle(request,false);
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97 }
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98
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99 Response handle(Request request,boolean notFound) {
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100 Thread thread = Thread.currentThread();
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101 String oldName = thread.getName();
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102 thread.setName(request.headers.get("host")+request.path);
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103 rwLock.readLock().lock();
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104 try {
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105 return service(request,notFound);
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106 } catch(LuanException e) {
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107 String err = e.getLuanStackTraceString();
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108 logger.error(err+"\n"+request.rawHead.trim()+"\n");
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109 String msg = "Internel Server Error\n\n" + err;
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110 return Response.errorResponse( Status.INTERNAL_SERVER_ERROR, msg );
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111 } finally {
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112 rwLock.readLock().unlock();
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113 thread.setName(oldName);
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114 }
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115 }
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116
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117 public void onClose(Closeable c) {
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118 synchronized(onClose) {
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119 onClose.add(new WeakReference<Closeable>(c));
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120 }
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121 }
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122
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123 public void close() {
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124 synchronized(onClose) {
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125 for( Reference<Closeable> ref : onClose ) {
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126 Closeable c = ref.get();
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127 if( c != null ) {
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128 try {
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129 c.close();
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130 } catch(IOException e) {
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131 logger.error(c.toString(),e);
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132 }
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133 }
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134 }
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135 onClose.clear();
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136 }
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137 }
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138
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139 public Object call_rpc(String fnName,Object... args) throws LuanException {
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140 rwLock.readLock().lock();
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141 try {
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diff changeset
142 LuanFunction fn;
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143 synchronized(luanInit) {
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144 enableLoad("luan:Rpc.luan");
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145 LuanTable rpc = (LuanTable)currentLuan.require("luan:Rpc.luan");
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146 LuanTable fns = (LuanTable)rpc.get("functions");
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147 fn = (LuanFunction)fns.get(fnName);
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148 if( fn == null )
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149 throw new LuanException( "function not found: " + fnName );
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150 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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151 fn = (LuanFunction)cloner.get(fn);
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152 }
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153 return fn.call(args);
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154 } finally {
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155 rwLock.readLock().unlock();
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156 }
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157 }
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158
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159 public void reset_luan() {
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160 new Thread() {public void run(){
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161 rwLock.writeLock().lock();
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162 try {
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163 close();
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164 currentLuan = newLuan();
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165 } finally {
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166 rwLock.writeLock().unlock();
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167 }
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168 }}.start();
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169 }
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170
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171 public void disable_luan() {
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172 isDisabled = true;
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173 }
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174
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175 public Object runLuan(String sourceText,String sourceName) throws LuanException {
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176 rwLock.readLock().lock();
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177 try {
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178 Luan luan = currentLuan;
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179 synchronized(luanInit) {
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180 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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181 Luan luan2 = (Luan)cloner.clone(luan);
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182 LuanFunction fn = luan2.load(sourceText,sourceName);
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183 return fn.call();
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184 }
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185 } finally {
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186 rwLock.readLock().unlock();
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187 }
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188 }
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189
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190 public void eval_in_root(String text) throws LuanException {
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191 Luan luan;
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192 synchronized(luanInit) {
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193 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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194 luan = (Luan)cloner.clone(currentLuan);
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195 }
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196 luan.onClose = this;
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197 luan.load(text,"<eval_in_root>",null).call();
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198 currentLuan = luan;
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199 }
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200
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201 public static void start(Server server) throws Exception {
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202 try {
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203 server.start();
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204 } catch(BindException e) {
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205 throw new LuanException(e.toString());
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206 }
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207 }
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208
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209
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210
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211 // from HttpServicer
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212
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213 private Response service(Request request,boolean notFound)
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214 throws LuanException
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215 {
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216 try {
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217 if( !notFound )
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218 return serviceLuan(request);
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219 else
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220 return serviceNotFound(request);
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221 } catch(LuanException e) {
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222 return handleError(request,e);
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223 }
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224 }
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225
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226 private Response handleError(Request request,LuanException e)
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227 throws LuanException
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228 {
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229 //e.printStackTrace();
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230 Luan luan;
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231 synchronized(luanInit) {
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232 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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233 luan = (Luan)cloner.clone(currentLuan);
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234 }
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235 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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236 return (Response)module.fn("handle_error").call( request, e.table(luan) );
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237 }
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238
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239 private Response serviceLuan(Request request)
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240 throws LuanException
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241 {
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242 String modName = "site:" + request.path +".luan";
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diff changeset
243 LuanFunction fn;
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244 Luan luan;
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245 synchronized(luanInit) {
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246 enableLoad("luan:http/Http.luan",modName);
1359
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247 currentLuan.require("luan:http/Http.luan");
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diff changeset
248 Object mod = PackageLuan.load(currentLuan,modName);
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249 if( mod.equals(Boolean.FALSE) )
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250 return null;
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251 if( !(mod instanceof LuanFunction) )
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252 throw new LuanException( "module '"+modName+"' must return a function" );
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253 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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254 luan = (Luan)cloner.clone(currentLuan);
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255 fn = (LuanFunction)cloner.get(mod);
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256 }
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diff changeset
257 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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258 module.fn("new_request").call(request);
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259 module.fn("new_response").call();
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diff changeset
260 fn.call();
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261 return (Response)module.fn("finish").call();
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262 }
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263
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264 private Response serviceNotFound(Request request)
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265 throws LuanException
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266 {
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diff changeset
267 LuanFunction fn;
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diff changeset
268 Luan luan;
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diff changeset
269 synchronized(luanInit) {
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270 enableLoad("luan:http/Http.luan");
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271 LuanTable module = (LuanTable)currentLuan.require("luan:http/Http.luan");
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272 fn = module.fn("not_found_handler");
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273 if( fn == null )
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274 return null;
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275 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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276 luan = (Luan)cloner.clone(currentLuan);
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277 fn = (LuanFunction)cloner.get(fn);
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diff changeset
278 }
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diff changeset
279 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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diff changeset
280 module.fn("new_request").call(request);
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281 module.fn("new_response").call();
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diff changeset
282 Object obj = Luan.first(fn.call());
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diff changeset
283 if( !(obj instanceof Boolean) )
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284 throw new LuanException("not_found_handler must return boolean");
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diff changeset
285 boolean handled = (Boolean)obj;
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286 return handled ? (Response)module.fn("finish").call() : null;
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287 }
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diff changeset
288
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diff changeset
289 private void enableLoad(String... mods) throws LuanException {
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290 LuanTable loaded = PackageLuan.loaded(currentLuan);
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diff changeset
291 for( String mod : mods ) {
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diff changeset
292 if( loaded.rawGet(mod) == null ) {
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diff changeset
293 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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diff changeset
294 currentLuan = (Luan)cloner.clone(currentLuan);
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diff changeset
295 break;
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diff changeset
296 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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