Mercurial Hosting > luan

annotate src/luan/modules/http/LuanHandler.java @ 1563:8fbcc4747091

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remove LuanFunction.luan
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 09 Nov 2020 01:37:57 -0700
parents b89212fd04b5
children c922446f53aa
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.Set;
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14 import java.util.Collections;
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15 import java.util.concurrent.ConcurrentHashMap;
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16 import java.util.concurrent.locks.ReadWriteLock;
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17 import java.util.concurrent.locks.ReentrantReadWriteLock;
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18 import goodjava.logging.Logger;
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19 import goodjava.logging.LoggerFactory;
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20 import goodjava.webserver.Request;
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21 import goodjava.webserver.Response;
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22 import goodjava.webserver.Status;
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23 import goodjava.webserver.Server;
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24 import goodjava.webserver.Handler;
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25 import goodjava.webserver.ResponseOutputStream;
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26 import luan.Luan;
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27 import luan.LuanTable;
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28 import luan.LuanFunction;
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29 import luan.LuanJavaFunction;
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30 import luan.LuanCloner;
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31 import luan.LuanException;
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32 import luan.modules.PackageLuan;
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33 import luan.modules.BasicLuan;
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34 import luan.modules.logging.LuanLogger;
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36
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37 public final class LuanHandler implements Handler, Closeable {
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38 private static final Logger logger = LoggerFactory.getLogger(LuanHandler.class);
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39
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40 private static final Set<LuanHandler> dontGc = Collections.newSetFromMap(new ConcurrentHashMap<LuanHandler,Boolean>());
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41
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42 private final Luan luanInit;
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43 private final String domain;
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44 private final ReadWriteLock rwLock = new ReentrantReadWriteLock();
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45 private volatile Luan currentLuan;
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46 private volatile boolean isDisabled = false;
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47
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48 private static final Method resetLuanMethod;
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49 private static final Method evalInRootMethod;
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50 private static final Method disableLuanMethod;
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51 private static final Method dontGcMethod;
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52 static {
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53 try {
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54 resetLuanMethod = LuanHandler.Fns.class.getMethod( "reset_luan" );
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55 evalInRootMethod = LuanHandler.Fns.class.getMethod( "eval_in_root", String.class );
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56 disableLuanMethod = LuanHandler.Fns.class.getMethod( "disable_luan" );
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57 dontGcMethod = LuanHandler.Fns.class.getMethod( "dont_gc" );
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58 } catch(NoSuchMethodException e) {
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59 throw new RuntimeException(e);
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60 }
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61 }
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62
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63 public LuanHandler(Luan luanInit,String domain) {
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64 this.luanInit = luanInit;
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65 this.domain = domain;
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66 try {
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67 Fns fns = new Fns(this);
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68 LuanTable Http = (LuanTable)luanInit.require("luan:http/Http.luan");
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69 if( Http.get(luanInit,"reset_luan") == null )
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70 Http.put( luanInit, "reset_luan", new LuanJavaFunction(resetLuanMethod,fns) );
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71 Http.put( luanInit, "eval_in_root", new LuanJavaFunction(evalInRootMethod,fns) );
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72 Http.put( luanInit, "disable_luan", new LuanJavaFunction(disableLuanMethod,fns) );
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73 Http.put( luanInit, "dont_gc", new LuanJavaFunction(dontGcMethod,fns) );
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74 } catch(LuanException e) {
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75 throw new RuntimeException(e);
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76 }
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77 if( domain != null )
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78 logger.info("new "+domain);
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79 currentLuan = 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.info("gc "+domain);
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85 }
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86
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87 private Luan newLuan() {
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88 Luan luan;
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89 synchronized(luanInit) {
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90 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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91 luan = (Luan)cloner.clone(luanInit);
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92 }
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93 LuanLogger.startThreadLogging(luan);
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94 try {
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95 PackageLuan.load(luan,"site:/init.luan");
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96 } catch(LuanException e) {
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97 //e.printStackTrace();
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98 String err = e.getLuanStackTraceString();
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99 logger.error(err);
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100 } finally {
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101 LuanLogger.endThreadLogging();
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102 }
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103 return luan;
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104 }
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105
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106 static final String NOT_FOUND = "luan-not-found";
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107
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108 @Override public Response handle(Request request) {
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109 if( isDisabled )
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110 return null;
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111 if( request.path.endsWith("/") )
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112 return null;
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113 return handle( request, request.headers.containsKey(NOT_FOUND) );
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114 }
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115
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116 private Response handle(Request request,boolean notFound) {
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117 Thread thread = Thread.currentThread();
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118 String oldName = thread.getName();
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119 thread.setName(request.headers.get("host")+request.path);
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120 rwLock.readLock().lock();
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121 LuanLogger.startThreadLogging(currentLuan);
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122 try {
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123 return service(request,notFound);
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124 } catch(LuanException e) {
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125 String err = e.getLuanStackTraceString();
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126 logger.error(err+"\n"+request.rawHead.trim()+"\n");
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127 String msg = "Internel Server Error\n\n" + err;
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128 return Response.errorResponse( Status.INTERNAL_SERVER_ERROR, msg );
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129 } finally {
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130 LuanLogger.endThreadLogging();
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131 rwLock.readLock().unlock();
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132 thread.setName(oldName);
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133 }
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134 }
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135
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136 public void close() {
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137 Object obj = dontGc.remove(this);
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138 //logger.info("close "+domain+" "+(obj!=null));
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139 }
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140
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141 public Object call_rpc(Luan luan,String fnName,Object... args) throws LuanException {
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142 rwLock.readLock().lock();
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143 LuanLogger.startThreadLogging(currentLuan);
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144 try {
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145 LuanFunction fn;
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146 synchronized(luanInit) {
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147 enableLoad("luan:Rpc.luan");
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148 LuanTable rpc = (LuanTable)currentLuan.require("luan:Rpc.luan");
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149 LuanTable fns = (LuanTable)rpc.get(luan,"functions");
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150 fn = (LuanFunction)fns.get(luan,fnName);
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151 if( fn == null )
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152 throw new LuanException( "function not found: " + fnName );
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153 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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154 fn = (LuanFunction)cloner.get(fn);
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155 }
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156 return fn.call(luan,args);
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157 } finally {
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158 LuanLogger.endThreadLogging();
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159 rwLock.readLock().unlock();
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160 }
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161 }
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162
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163 public static void start(Server server) throws Exception {
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164 try {
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165 server.start();
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166 } catch(BindException e) {
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167 throw new LuanException(e.toString());
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168 }
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169 }
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170
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171 private void reset_luan() {
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172 new Thread() {public void run(){
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173 rwLock.writeLock().lock();
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174 try {
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175 close();
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176 currentLuan = newLuan();
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177 } finally {
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178 rwLock.writeLock().unlock();
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179 }
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180 }}.start();
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181 }
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182
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183 private void disable_luan() {
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184 isDisabled = true;
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185 }
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186
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187 private void eval_in_root(String text) throws LuanException {
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188 Luan luan;
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189 synchronized(luanInit) {
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190 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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191 luan = (Luan)cloner.clone(currentLuan);
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192 }
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193 luan.load(text,"<eval_in_root>",false,null).call(luan);
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194 currentLuan = luan;
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195 }
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196
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197 private void dont_gc() {
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198 dontGc.add(this);
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199 //logger.info("dont_gc "+domain);
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200 }
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201
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202 public static final class Fns {
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203 private final Reference<LuanHandler> ref;
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204
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205 private Fns(LuanHandler lh) {
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206 this.ref = new WeakReference<LuanHandler>(lh);
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207 }
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208
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209 private LuanHandler lh() throws LuanException {
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210 LuanHandler lh = ref.get();
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211 if( lh == null )
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212 throw new LuanException("HTTP handler has been garbage collected");
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213 return lh;
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214 }
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215
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216 public void reset_luan() throws LuanException {
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217 lh().reset_luan();
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218 }
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219
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220 public void disable_luan() throws LuanException {
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221 lh().disable_luan();
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222 }
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223
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224 public void eval_in_root(String text) throws LuanException {
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225 lh().eval_in_root(text);
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226 }
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227
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228 public void dont_gc() throws LuanException {
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229 lh().dont_gc();
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230 }
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231 }
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232
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233
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diff changeset
234 // from HttpServicer
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235
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236 private Response service(Request request,boolean notFound)
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237 throws LuanException
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238 {
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239 try {
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240 if( !notFound )
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241 return serviceLuan(request);
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242 else
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243 return serviceNotFound(request);
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diff changeset
244 } catch(LuanException e) {
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245 return handleError(request,e);
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246 }
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247 }
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248
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249 private Response handleError(Request request,LuanException e)
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250 throws LuanException
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251 {
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diff changeset
252 //e.printStackTrace();
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253 Luan luan;
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254 synchronized(luanInit) {
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diff changeset
255 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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diff changeset
256 luan = (Luan)cloner.clone(currentLuan);
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257 }
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diff changeset
258 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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259 return (Response)module.fn("handle_error").call( luan, request, e.table(luan) );
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260 }
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261
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262 private Response serviceLuan(Request request)
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263 throws LuanException
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264 {
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diff changeset
265 String modName = "site:" + request.path +".luan";
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diff changeset
266 LuanFunction fn;
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diff changeset
267 Luan luan;
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268 synchronized(luanInit) {
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diff changeset
269 enableLoad("luan:http/Http.luan",modName);
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diff changeset
270 currentLuan.require("luan:http/Http.luan");
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diff changeset
271 Object mod = PackageLuan.load(currentLuan,modName);
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diff changeset
272 if( mod.equals(Boolean.FALSE) )
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273 return null;
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274 if( !(mod instanceof LuanFunction) )
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275 throw new LuanException( "module '"+modName+"' must return a function" );
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diff changeset
276 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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diff changeset
277 luan = (Luan)cloner.clone(currentLuan);
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diff changeset
278 fn = (LuanFunction)cloner.get(mod);
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diff changeset
279 }
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diff changeset
280 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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diff changeset
281 module.fn("new_request").call(luan,request);
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diff changeset
282 module.fn("new_response").call(luan);
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diff changeset
283 fn.call(luan);
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diff changeset
284 return (Response)module.fn("finish").call(luan);
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diff changeset
285 }
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diff changeset
286
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diff changeset
287 private Response serviceNotFound(Request request)
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288 throws LuanException
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diff changeset
289 {
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diff changeset
290 LuanFunction fn;
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diff changeset
291 Luan luan;
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diff changeset
292 synchronized(luanInit) {
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diff changeset
293 enableLoad("luan:http/Http.luan");
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diff changeset
294 LuanTable module = (LuanTable)currentLuan.require("luan:http/Http.luan");
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diff changeset
295 fn = module.fn("not_found_handler");
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diff changeset
296 if( fn == null )
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297 return null;
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diff changeset
298 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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diff changeset
299 luan = (Luan)cloner.clone(currentLuan);
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diff changeset
300 fn = (LuanFunction)cloner.get(fn);
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diff changeset
301 }
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diff changeset
302 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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diff changeset
303 module.fn("new_request").call(luan,request);
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304 module.fn("new_response").call(luan);
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305 Object obj = Luan.first(fn.call(luan));
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306 if( !(obj instanceof Boolean) )
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307 throw new LuanException("not_found_handler must return boolean");
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308 boolean handled = (Boolean)obj;
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309 return handled ? (Response)module.fn("finish").call(luan) : null;
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310 }
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311
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312 private void enableLoad(String... mods) throws LuanException {
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313 LuanTable loaded = PackageLuan.loaded(currentLuan);
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314 for( String mod : mods ) {
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315 if( loaded.rawGet(mod) == null ) {
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316 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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317 currentLuan = (Luan)cloner.clone(currentLuan);
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318 break;
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319 }
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320 }
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321 }
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322
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323 }