From 6b208753552001cf0664db2f4c4e45d0ed094e8a Mon Sep 17 00:00:00 2001
From: Peter 'Pita' Martischka <petermartischka@googlemail.com>
Date: Mon, 5 Dec 2011 18:24:59 +0100
Subject: [PATCH] add a tool to check for data corruption on pads

---
 bin/checkPad.js | 133 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 bin/checkPad.js

diff --git a/bin/checkPad.js b/bin/checkPad.js
new file mode 100644
index 00000000..9e054441
--- /dev/null
+++ b/bin/checkPad.js
@@ -0,0 +1,133 @@
+/*
+  This is a debug tool. It checks all revisions for data corruption
+*/
+
+if(process.argv.length != 3)
+{
+  console.error("Use: node checkPad.js $PADID");
+  process.exit(1);
+}
+//get the padID
+var padId = process.argv[2];
+
+//initalize the database
+var log4js = require("log4js");
+log4js.setGlobalLogLevel("INFO");
+var async = require("async");
+var db = require('../node/db/DB');
+var Changeset = require('../node/utils/Changeset');
+var padManager;
+
+async.series([
+  //intallize the database
+  function (callback)
+  {
+    db.init(callback);
+  },
+  //get the pad 
+  function (callback)
+  {
+    padManager = require('../node/db/PadManager');
+    
+    padManager.doesPadExists(padId, function(err, exists)
+    {
+      if(!exists)
+      {
+        console.error("Pad does not exist");
+        process.exit(1);
+      }
+      
+      padManager.getPad(padId, function(err, _pad)  
+      {
+        pad = _pad;
+        callback(err);
+      });
+    });
+  },
+  function (callback)
+  {    
+    //create an array with key kevisions
+    //key revisions always save the full pad atext
+    var head = pad.getHeadRevisionNumber();
+    var keyRevisions = [];
+    for(var i=0;i<head;i+=100)
+    {
+      keyRevisions.push(i);
+    }
+    
+    //run trough all key revisions
+    async.forEachSeries(keyRevisions, function(keyRev, callback)
+    {
+      //create an array of revisions we need till the next keyRevision or the End
+      var revisionsNeeded = [];
+      for(var i=keyRev;i<=keyRev+100 && i<=head; i++)
+      {
+        revisionsNeeded.push(i);
+      }
+      
+      //this array will hold all revision changesets
+      var revisions = [];
+      
+      //run trough all needed revisions and get them from the database
+      async.forEach(revisionsNeeded, function(revNum, callback)
+      {
+        db.db.get("pad:"+padId+":revs:" + revNum, function(err, revision)
+        {
+          revisions[revNum] = revision;
+          callback(err);
+        });
+      }, function(err)
+      {
+        if(err)
+        {
+          callback(err);
+          return;
+        }
+        
+        //check if the pad has a pool
+        if(pad.pool === undefined )
+        {
+          console.error("Attribute pool is missing");
+          process.exit(1);
+        }
+        
+        //check if there is a atext in the keyRevisions
+        if(revisions[keyRev] === undefined || revisions[keyRev].meta === undefined || revisions[keyRev].meta.atext === undefined)
+        {
+          console.error("No atext in key revision " + keyRev);
+          callback();
+          return;
+        }
+        
+        var apool = pad.pool;
+        var atext = revisions[keyRev].meta.atext;
+        
+        for(var i=keyRev+1;i<=keyRev+100 && i<=head; i++)
+        {
+          try
+          {
+            //console.log("check revision " + i);
+            var cs = revisions[i].changeset;
+            atext = Changeset.applyToAText(cs, atext, apool);
+          }
+          catch(e)
+          {
+            console.error("Bad changeset at revision " + i + " - " + e.message);
+            callback();
+            return;
+          }
+        }
+        
+        callback();
+      });
+    }, callback);
+  }
+], function (err)
+{
+  if(err) throw err;
+  else 
+  { 
+    console.log("finished");
+    process.exit(0);
+  }
+});