From 0d227c01d8add9e727cdc6f5c8a7faa59b0a3376 Mon Sep 17 00:00:00 2001
From: Li Yong <kaven276@vip.sina.com>
Date: Thu, 19 Mar 2015 10:50:11 +0800
Subject: [PATCH] noradle add inHub.js

---
 lib/inHub.js | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++
 server.js    |   5 ++
 2 files changed, 140 insertions(+)
 create mode 100644 lib/inHub.js

diff --git a/lib/inHub.js b/lib/inHub.js
new file mode 100644
index 0000000..7a540d1
--- /dev/null
+++ b/lib/inHub.js
@@ -0,0 +1,135 @@
+/**
+ * Created with JetBrains WebStorm.
+ * User: kaven276
+ * Date: 13-5-16
+ * Time: 下午2:47
+ */
+console.log(process.execPath);
+
+var net = require('net')
+  , C = require('./constant.js')
+  , debug = require('debug')('noradle:inhub')
+  , gseq = 0
+  ;
+
+// for accept front end request
+// may accept from different front nodejs connection request
+var server = net.createServer({allowHalfOpen : true}, function(c){
+  var seq = ++gseq;
+  debug('node(%d) connected', seq);
+
+  var freeSlotID = freeList.shift()
+    , marker = new Buffer(4)
+    ;
+  if (!freeSlotID) {
+    // no available free slot, disconnect client
+    marker.writeInt32BE(197610262, 0);
+    c.end(marker);
+    c.destroy();
+    debug('node(%d) connected but no free', seq);
+    return;
+  }
+
+  var slot = oraPool[freeSlotID]
+    ;
+  c.write(slot.head);
+  c.pipe(slot.oraSock, {end : false}).pipe(c);
+  debug('node(%d) use free slot %s, %j', seq, freeSlotID, freeList);
+
+  c.on('end', function(){
+    debug('node(%d) disconnected', seq);
+    // c.end();
+    if (oraPool[freeSlotID]) {
+      freeList.unshift(freeSlotID);
+      debug('node(%d) return back slot %s, %j', seq, freeSlotID, freeList);
+    }
+  });
+});
+
+
+var oraPool = new Array(1000)
+  , freeList = []
+  , connSeq = 0
+  ;
+// for oracle reverse connection
+// check magic number only
+var pool = net.createServer(function(c){
+  debug('oracle connected');
+  connSeq++;
+  var slotID;
+  c.on('readable', onHandshake);
+
+  var head, chunks = [], chunkSeq = 0;
+
+  function onHandshake(){
+    var data = c.read();
+    chunkSeq++;
+
+    if (data === null) {
+      debug('onHandshake(%d,%d): data === null', connSeq, chunkSeq);
+      return;
+    } else {
+      chunks.push(data);
+    }
+
+    if (chunks.length === 1) {
+      try {
+        var ptoken = data.readInt32BE(0);
+      } catch (e) {
+        ptoken = -1;
+      }
+      if (ptoken !== 197610261) {
+        console.warn('none oracle connection attempt found', data);
+        c.end();
+        c.destroy();
+        return;
+      }
+    }
+
+    if (data.length < 7) {
+      debug('onHandshake(%d,%d): data.length < 7', connSeq, chunkSeq);
+      debug(chunks, data);
+      return;
+    }
+    if (data.slice(-7).toString('ascii') !== '/080526') {
+      debug('onHandshake(%d,%d): data.slice(-7).toString("ascii"") !== "/080526"', connSeq, chunkSeq);
+      debug('partial oracle connect data', data, data.slice(36), data.slice(36).toString());
+      return;
+    }
+
+    head = Buffer.concat(chunks);
+    c.removeListener('readable', onHandshake);
+
+    slotID = head.readInt32BE(16);
+    oraPool[slotID] = {oraSock : c, head : head};
+    freeList.push(slotID);
+    debug('add new slot(%s), freeList=%j', slotID, freeList);
+  };
+
+  c.on('end', function(){
+    debug('oracle disconnected');
+    // find free list and remove from free list
+    delete oraPool[slotID];
+    var pos = freeList.indexOf(slotID);
+    if (pos >= 0) {
+      freeList.splice(pos, 1);
+      debug('removed slot(%s), freeList=%j', slotID, freeList);
+    } else {
+      debug('not found on end slotID(%s) in freeList(%j)', slotID, freeList);
+    }
+  });
+});
+
+exports.listenOracle = function(port){
+  pool.listen(port, function(){
+    debug('listening to oracle at port:%d', port);
+  });
+};
+
+exports.listenClient = function(port){
+  server.listen(port, function(){
+    debug('listening to client at port:%d ', port);
+  });
+};
+
+
diff --git a/server.js b/server.js
index d3f3d63..27cb170 100644
--- a/server.js
+++ b/server.js
@@ -42,6 +42,11 @@ Object.defineProperties(exports, {
       return require('./lib/poolMonitor.js');
     }
   },
+  inHub : {
+    get : function(){
+      return require('./lib/inHub.js');
+    }
+  },
 
   RSParser : {
     get : function(){