Mercurial Hosting > luan
annotate src/luan/modules/http/LuanHandler.java @ 1578:c922446f53aa
immutable threading
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Mon, 08 Feb 2021 14:16:19 -0700 |
parents | 8fbcc4747091 |
children | 2975c932864d |
rev | line source |
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1171 | 1 package luan.modules.http; |
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2 |
1231 | 3 import java.io.Closeable; |
1160 | 4 import java.io.Writer; |
5 import java.io.PrintWriter; | |
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6 import java.io.IOException; |
1264 | 7 import java.lang.ref.Reference; |
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; |
1264 | 11 import java.util.List; |
12 import java.util.ArrayList; | |
1401 | 13 import java.util.Set; |
14 import java.util.Collections; | |
15 import java.util.concurrent.ConcurrentHashMap; | |
1264 | 16 import java.util.concurrent.locks.ReadWriteLock; |
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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34 |
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35 |
1401 | 36 public final class LuanHandler implements Handler, Closeable { |
1454 | 37 private static final Logger logger = LoggerFactory.getLogger(LuanHandler.class); |
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38 |
1401 | 39 private static final Set<LuanHandler> dontGc = Collections.newSetFromMap(new ConcurrentHashMap<LuanHandler,Boolean>()); |
40 | |
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41 private final Luan luanInit; |
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42 private final String domain; |
1360 | 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 |
1186 | 47 private static final Method resetLuanMethod; |
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48 private static final Method evalInRootMethod; |
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49 private static final Method disableLuanMethod; |
1401 | 50 private static final Method dontGcMethod; |
1186 | 51 static { |
52 try { | |
1401 | 53 resetLuanMethod = LuanHandler.Fns.class.getMethod( "reset_luan" ); |
54 evalInRootMethod = LuanHandler.Fns.class.getMethod( "eval_in_root", String.class ); | |
55 disableLuanMethod = LuanHandler.Fns.class.getMethod( "disable_luan" ); | |
56 dontGcMethod = LuanHandler.Fns.class.getMethod( "dont_gc" ); | |
1186 | 57 } catch(NoSuchMethodException e) { |
58 throw new RuntimeException(e); | |
59 } | |
60 } | |
61 | |
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62 public LuanHandler(Luan luanInit,String domain) { |
1231 | 63 this.luanInit = luanInit; |
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64 this.domain = domain; |
1186 | 65 try { |
1401 | 66 Fns fns = new Fns(this); |
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67 LuanTable Http = (LuanTable)luanInit.require("luan:http/Http.luan"); |
1562 | 68 if( Http.get(luanInit,"reset_luan") == null ) |
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69 Http.put( luanInit, "reset_luan", new LuanJavaFunction(resetLuanMethod,fns) ); |
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70 Http.put( luanInit, "eval_in_root", new LuanJavaFunction(evalInRootMethod,fns) ); |
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71 Http.put( luanInit, "disable_luan", new LuanJavaFunction(disableLuanMethod,fns) ); |
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72 Http.put( luanInit, "dont_gc", new LuanJavaFunction(dontGcMethod,fns) ); |
1186 | 73 } catch(LuanException e) { |
74 throw new RuntimeException(e); | |
75 } | |
1411 | 76 if( domain != null ) |
1454 | 77 logger.info("new "+domain); |
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78 currentLuan = newLuan(); |
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79 } |
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80 |
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81 protected void finalize() throws Throwable { |
1411 | 82 if( domain != null ) |
1454 | 83 logger.info("gc "+domain); |
1186 | 84 } |
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85 |
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86 private Luan newLuan() { |
1335 | 87 Luan luan; |
88 synchronized(luanInit) { | |
1578 | 89 luan = new Luan(luanInit); |
1335 | 90 } |
1454 | 91 LuanLogger.startThreadLogging(luan); |
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92 try { |
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93 PackageLuan.load(luan,"site:/init.luan"); |
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94 } catch(LuanException e) { |
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95 //e.printStackTrace(); |
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96 String err = e.getLuanStackTraceString(); |
1454 | 97 logger.error(err); |
98 } finally { | |
99 LuanLogger.endThreadLogging(); | |
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100 } |
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101 return luan; |
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102 } |
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103 |
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104 static final String NOT_FOUND = "luan-not-found"; |
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105 |
1160 | 106 @Override public Response handle(Request request) { |
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107 if( isDisabled ) |
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108 return null; |
1167 | 109 if( request.path.endsWith("/") ) |
110 return null; | |
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111 return handle( request, request.headers.containsKey(NOT_FOUND) ); |
1167 | 112 } |
113 | |
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114 private Response handle(Request request,boolean notFound) { |
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115 Thread thread = Thread.currentThread(); |
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116 String oldName = thread.getName(); |
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117 thread.setName(request.headers.get("host")+request.path); |
1360 | 118 rwLock.readLock().lock(); |
1454 | 119 LuanLogger.startThreadLogging(currentLuan); |
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120 try { |
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121 return service(request,notFound); |
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122 } catch(LuanException e) { |
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123 String err = e.getLuanStackTraceString(); |
1454 | 124 logger.error(err+"\n"+request.rawHead.trim()+"\n"); |
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125 String msg = "Internel Server Error\n\n" + err; |
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126 return Response.errorResponse( Status.INTERNAL_SERVER_ERROR, msg ); |
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127 } finally { |
1454 | 128 LuanLogger.endThreadLogging(); |
1360 | 129 rwLock.readLock().unlock(); |
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130 thread.setName(oldName); |
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131 } |
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132 } |
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133 |
1231 | 134 public void close() { |
1401 | 135 Object obj = dontGc.remove(this); |
1454 | 136 //logger.info("close "+domain+" "+(obj!=null)); |
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137 } |
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138 |
1578 | 139 public Object call_rpc(String fnName,Object... args) throws LuanException { |
1360 | 140 rwLock.readLock().lock(); |
1454 | 141 LuanLogger.startThreadLogging(currentLuan); |
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142 try { |
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143 LuanFunction fn; |
1578 | 144 Luan luan; |
145 synchronized(currentLuan) { | |
1335 | 146 LuanTable rpc = (LuanTable)currentLuan.require("luan:Rpc.luan"); |
1578 | 147 LuanTable fns = (LuanTable)rpc.get(currentLuan,"functions"); |
148 fn = (LuanFunction)fns.get(currentLuan,fnName); | |
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149 if( fn == null ) |
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150 throw new LuanException( "function not found: " + fnName ); |
1578 | 151 luan = new Luan(currentLuan); |
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152 } |
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153 return fn.call(luan,args); |
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154 } finally { |
1454 | 155 LuanLogger.endThreadLogging(); |
1360 | 156 rwLock.readLock().unlock(); |
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157 } |
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158 } |
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159 |
1401 | 160 public static void start(Server server) throws Exception { |
161 try { | |
162 server.start(); | |
163 } catch(BindException e) { | |
164 throw new LuanException(e.toString()); | |
165 } | |
166 } | |
167 | |
168 private void reset_luan() { | |
1360 | 169 new Thread() {public void run(){ |
170 rwLock.writeLock().lock(); | |
171 try { | |
172 close(); | |
173 currentLuan = newLuan(); | |
174 } finally { | |
175 rwLock.writeLock().unlock(); | |
176 } | |
177 }}.start(); | |
1186 | 178 } |
179 | |
1401 | 180 private void disable_luan() { |
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181 isDisabled = true; |
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182 } |
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183 |
1401 | 184 private void eval_in_root(String text) throws LuanException { |
1578 | 185 synchronized(currentLuan) { |
186 currentLuan.load(text,"<eval_in_root>",false,null).call(currentLuan); | |
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187 } |
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188 } |
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189 |
1401 | 190 private void dont_gc() { |
191 dontGc.add(this); | |
1454 | 192 //logger.info("dont_gc "+domain); |
1401 | 193 } |
194 | |
195 public static final class Fns { | |
196 private final Reference<LuanHandler> ref; | |
197 | |
198 private Fns(LuanHandler lh) { | |
199 this.ref = new WeakReference<LuanHandler>(lh); | |
200 } | |
201 | |
202 private LuanHandler lh() throws LuanException { | |
203 LuanHandler lh = ref.get(); | |
204 if( lh == null ) | |
205 throw new LuanException("HTTP handler has been garbage collected"); | |
206 return lh; | |
207 } | |
208 | |
209 public void reset_luan() throws LuanException { | |
210 lh().reset_luan(); | |
211 } | |
212 | |
213 public void disable_luan() throws LuanException { | |
214 lh().disable_luan(); | |
215 } | |
216 | |
217 public void eval_in_root(String text) throws LuanException { | |
218 lh().eval_in_root(text); | |
219 } | |
220 | |
221 public void dont_gc() throws LuanException { | |
222 lh().dont_gc(); | |
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223 } |
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224 } |
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225 |
1335 | 226 |
227 // from HttpServicer | |
228 | |
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229 private Response service(Request request,boolean notFound) |
1335 | 230 throws LuanException |
231 { | |
232 try { | |
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233 if( !notFound ) |
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234 return serviceLuan(request); |
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235 else |
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236 return serviceNotFound(request); |
1335 | 237 } catch(LuanException e) { |
238 return handleError(request,e); | |
239 } | |
240 } | |
241 | |
242 private Response handleError(Request request,LuanException e) | |
243 throws LuanException | |
244 { | |
1578 | 245 //e.printStackTrace(); |
1335 | 246 Luan luan; |
1578 | 247 synchronized(currentLuan) { |
248 luan = new Luan(currentLuan); | |
1335 | 249 } |
250 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan"); | |
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251 return (Response)module.fn("handle_error").call( luan, request, e.table(luan) ); |
1335 | 252 } |
253 | |
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254 private Response serviceLuan(Request request) |
1335 | 255 throws LuanException |
256 { | |
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257 String modName = "site:" + request.path +".luan"; |
1335 | 258 LuanFunction fn; |
259 Luan luan; | |
1578 | 260 synchronized(currentLuan) { |
1359 | 261 currentLuan.require("luan:http/Http.luan"); |
1335 | 262 Object mod = PackageLuan.load(currentLuan,modName); |
263 if( mod.equals(Boolean.FALSE) ) | |
264 return null; | |
265 if( !(mod instanceof LuanFunction) ) | |
266 throw new LuanException( "module '"+modName+"' must return a function" ); | |
1578 | 267 luan = new Luan(currentLuan); |
268 fn = (LuanFunction)mod; | |
1335 | 269 } |
270 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan"); | |
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271 module.fn("new_request").call(luan,request); |
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272 module.fn("new_response").call(luan); |
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273 fn.call(luan); |
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274 return (Response)module.fn("finish").call(luan); |
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275 } |
1335 | 276 |
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277 private Response serviceNotFound(Request request) |
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278 throws LuanException |
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279 { |
1359 | 280 LuanFunction fn; |
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281 Luan luan; |
1578 | 282 synchronized(currentLuan) { |
1359 | 283 LuanTable module = (LuanTable)currentLuan.require("luan:http/Http.luan"); |
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284 fn = module.fn("not_found_handler"); |
1359 | 285 if( fn == null ) |
286 return null; | |
1578 | 287 luan = new Luan(currentLuan); |
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288 } |
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289 LuanTable module = (LuanTable)luan.require("luan:http/Http.luan"); |
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290 module.fn("new_request").call(luan,request); |
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291 module.fn("new_response").call(luan); |
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292 Object obj = Luan.first(fn.call(luan)); |
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293 if( !(obj instanceof Boolean) ) |
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294 throw new LuanException("not_found_handler must return boolean"); |
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295 boolean handled = (Boolean)obj; |
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296 return handled ? (Response)module.fn("finish").call(luan) : null; |
1335 | 297 } |
298 | |
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299 } |