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annotate src/luan/modules/http/LuanHandler.java @ 1615:38894708bade

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better init.luan exception handling
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 03 Jun 2021 18:00:49 -0600
parents 9303bacae890
children a37ffe2d1b14
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.LuanException;
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31 import luan.modules.PackageLuan;
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32 import luan.modules.BasicLuan;
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33 import luan.modules.logging.LuanLogger;
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35
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36 public final class LuanHandler implements Handler, Closeable {
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37 private static final Logger logger = LoggerFactory.getLogger(LuanHandler.class);
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38
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39 private static final Set<LuanHandler> dontGc = Collections.newSetFromMap(new ConcurrentHashMap<LuanHandler,Boolean>());
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40
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41 private final Luan luanInit;
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42 private final String domain;
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43 private final ReadWriteLock rwLock = new ReentrantReadWriteLock();
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44 private volatile Luan currentLuan;
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45 private volatile boolean isDisabled = false;
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46 private volatile boolean didInit;
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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 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 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 if( request.path.endsWith("/") )
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119 return null;
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120 return handle( request, request.headers.containsKey(NOT_FOUND) );
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121 }
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122
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123 private Response handle(Request request,boolean notFound) {
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124 Thread thread = Thread.currentThread();
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125 String oldName = thread.getName();
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126 thread.setName(request.headers.get("host")+request.path);
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127 rwLock.readLock().lock();
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128 LuanLogger.startThreadLogging(currentLuan);
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129 try {
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130 init(currentLuan);
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131 return service(request,notFound);
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132 } catch(LuanException e) {
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133 String err = e.getLuanStackTraceString();
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134 //System.err.println(err);
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135 logger.error(err+"\n"+request.rawHead.trim()+"\n");
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136 String msg = "Internel Server Error\n\n" + err;
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137 return Response.errorResponse( Status.INTERNAL_SERVER_ERROR, msg );
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138 } finally {
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139 LuanLogger.endThreadLogging();
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140 rwLock.readLock().unlock();
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141 thread.setName(oldName);
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142 }
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143 }
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144
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145 public void close() {
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146 Object obj = dontGc.remove(this);
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147 //logger.info("close "+domain+" "+(obj!=null));
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148 }
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149
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150 public Object call_rpc(String fnName,Object... args) throws LuanException {
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151 rwLock.readLock().lock();
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152 LuanLogger.startThreadLogging(currentLuan);
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153 try {
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154 LuanFunction fn;
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155 Luan luan;
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156 synchronized(currentLuan) {
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157 LuanTable rpc = (LuanTable)currentLuan.require("luan:Rpc.luan");
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158 LuanTable fns = (LuanTable)rpc.get(currentLuan,"functions");
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159 fn = (LuanFunction)fns.get(currentLuan,fnName);
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160 if( fn == null )
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161 throw new LuanException( "function not found: " + fnName );
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162 luan = new Luan(currentLuan);
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163 }
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164 return fn.call(luan,args);
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165 } finally {
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166 LuanLogger.endThreadLogging();
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167 rwLock.readLock().unlock();
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168 }
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169 }
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170
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171 public static void start(Server server) throws Exception {
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172 try {
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173 server.start();
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174 } catch(BindException e) {
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175 throw new LuanException(e.toString());
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176 }
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177 }
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178
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179 private void reset_luan() {
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180 new Thread() {public void run(){
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181 rwLock.writeLock().lock();
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182 try {
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183 close();
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184 newLuan();
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185 } finally {
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186 rwLock.writeLock().unlock();
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187 }
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188 }}.start();
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189 }
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190
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191 private void disable_luan() {
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192 isDisabled = true;
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193 }
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194
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195 private void eval_in_root(String text) throws LuanException {
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196 synchronized(currentLuan) {
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197 currentLuan.load(text,"<eval_in_root>",false,null).call(currentLuan);
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198 }
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199 }
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200
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201 private void dont_gc() {
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202 dontGc.add(this);
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203 //logger.info("dont_gc "+domain);
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204 }
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205
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206 public static final class Fns {
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207 private final Reference<LuanHandler> ref;
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208
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209 private Fns(LuanHandler lh) {
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210 this.ref = new WeakReference<LuanHandler>(lh);
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211 }
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212
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213 private LuanHandler lh() throws LuanException {
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214 LuanHandler lh = ref.get();
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215 if( lh == null )
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216 throw new LuanException("HTTP handler has been garbage collected");
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217 return lh;
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218 }
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219
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diff changeset
220 public void reset_luan() throws LuanException {
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221 lh().reset_luan();
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222 }
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223
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diff changeset
224 public void disable_luan() throws LuanException {
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225 lh().disable_luan();
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226 }
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227
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diff changeset
228 public void eval_in_root(String text) throws LuanException {
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229 lh().eval_in_root(text);
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230 }
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diff changeset
231
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diff changeset
232 public void dont_gc() throws LuanException {
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diff changeset
233 lh().dont_gc();
1004
3fa54d9d19cd better handling of BindException
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234 }
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diff changeset
235 }
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diff changeset
236
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237
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diff changeset
238 // from HttpServicer
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239
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diff changeset
240 private Response service(Request request,boolean notFound)
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241 throws LuanException
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diff changeset
242 {
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diff changeset
243 try {
1358
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244 if( !notFound )
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245 return serviceLuan(request);
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246 else
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247 return serviceNotFound(request);
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diff changeset
248 } catch(LuanException e) {
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249 return handleError(request,e);
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250 }
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251 }
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diff changeset
252
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diff changeset
253 private Response handleError(Request request,LuanException e)
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diff changeset
254 throws LuanException
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diff changeset
255 {
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diff changeset
256 //e.printStackTrace();
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diff changeset
257 Luan luan;
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diff changeset
258 synchronized(currentLuan) {
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259 luan = new Luan(currentLuan);
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260 }
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diff changeset
261 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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diff changeset
262 return (Response)module.fn("handle_error").call( luan, request, e.table(luan) );
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263 }
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diff changeset
264
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diff changeset
265 private Response serviceLuan(Request request)
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266 throws LuanException
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diff changeset
267 {
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diff changeset
268 String modName = "site:" + request.path +".luan";
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diff changeset
269 LuanFunction fn;
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diff changeset
270 Luan luan;
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diff changeset
271 synchronized(currentLuan) {
1359
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diff changeset
272 currentLuan.require("luan:http/Http.luan");
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diff changeset
273 Object mod = PackageLuan.load(currentLuan,modName,null);
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diff changeset
274 if( mod.equals(Boolean.FALSE) )
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diff changeset
275 return null;
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diff changeset
276 if( !(mod instanceof LuanFunction) )
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diff changeset
277 throw new LuanException( "module '"+modName+"' must return a function" );
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diff changeset
278 luan = new Luan(currentLuan);
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diff changeset
279 fn = (LuanFunction)mod;
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diff changeset
280 }
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diff changeset
281 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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diff changeset
282 module.fn("new_request").call(luan,request);
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diff changeset
283 module.fn("new_response").call(luan);
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diff changeset
284 fn.call(luan);
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diff changeset
285 return (Response)module.fn("finish").call(luan);
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diff changeset
286 }
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diff changeset
287
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diff changeset
288 private Response serviceNotFound(Request request)
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289 throws LuanException
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diff changeset
290 {
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diff changeset
291 LuanFunction fn;
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diff changeset
292 Luan luan;
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diff changeset
293 synchronized(currentLuan) {
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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 luan = new Luan(currentLuan);
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diff changeset
299 }
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diff changeset
300 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan");
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diff changeset
301 module.fn("new_request").call(luan,request);
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diff changeset
302 module.fn("new_response").call(luan);
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diff changeset
303 Object obj = Luan.first(fn.call(luan));
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diff changeset
304 if( !(obj instanceof Boolean) )
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diff changeset
305 throw new LuanException("not_found_handler must return boolean");
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diff changeset
306 boolean handled = (Boolean)obj;
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307 return handled ? (Response)module.fn("finish").call(luan) : null;
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308 }
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309
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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310 }