optimizations, implemented local storage cache

lib/boards-api.js

@@ -53,6 +53,25 @@ function BoardsAPI(ipfs){
   this.users = {} // userID : profileHash
   this.resolving_ipns = {} // to check if a resolve is already in progress
   this.ee = new EventEmitter()
+  if(localStorage !== undefined){
+    // Use localStorage to store the IPNS cache
+    var stored = localStorage.getItem('ipfs-boards-user-cache')
+    try {
+      this.users = JSON.parse(stored)
+      if(this.users === null || this.users === undefined){
+        this.users = {}
+      }
+    } catch(e){
+      this.users = {}
+    }
+  }
+}
+
+BoardsAPI.prototype.backupCache = function(){
+  if(localStorage !== undefined){
+    // Use localStorage to store the IPNS cache
+    localStorage.setItem('ipfs-boards-user-cache',JSON.stringify(this.users))
+  }
 }
 
 // Rewrote this to use event emitters. Should also add periodic rechecking
@@ -74,15 +93,11 @@ BoardsAPI.prototype.resolveIPNS = function(n,handler){
       if(err){
         // Communicate error
         this.ee.emit(n,undefined,err)
-      } else if(!cached){
+      } else if(cached !== r.Path){
         //console.log('oldcache',this.users)
         //console.log('Setting cache for',n,'to',r.Path)
         this.users[n] = r.Path
-        this.ee.emit(n,r.Path)
+        this.backupCache()
-      } else if(cached !== r.Path){
-        // Update cache, emit new value to listeners
-        //console.log('Setting cache for',n,'from',this.users[n],'to',r.Path)
-        this.users[n] = r.Path
         this.ee.emit(n,r.Path)
       }
     })
@@ -90,10 +105,6 @@ BoardsAPI.prototype.resolveIPNS = function(n,handler){
   return this.ee
 }
 
-BoardsAPI.prototype.getIPNS = function(){
-
-}
-
 BoardsAPI.prototype.isUserProfile = function(addr,done){
   this.ipfs.cat(addr+'/ipfs-boards-version.txt',(err,r) => {
     if(err) return done(false)
@@ -239,25 +250,11 @@ BoardsAPI.prototype.getUserPostListInBoard = function(user,board,done){
   return ee
 }
 
-BoardsAPI.prototype.getCommentsFor = function(parent,done){
+BoardsAPI.prototype.getCommentsFor = function(parent){
-
+  // Create an EventEmitter, start looking and emit an event for every new comment
 }
 
-// Work only in writable mode:
+// API for publishing content and managing to be done later...
-
-BoardsAPI.prototype.createPost = function(post,board,done){
-
-}
-
-BoardsAPI.prototype.createComment = function(parent,comment,done){
-
-}
-
-BoardsAPI.prototype.createUpvote = function(parent,done){
-
-}
-
-// API for managing the administrations to be done later
 
 // Initialize API
 BoardsAPI.prototype.init = function(done){
@@ -265,7 +262,7 @@ BoardsAPI.prototype.init = function(done){
     if(err){
       console.log(err)
       done(err)
-    } else {
+    } else if(res.ID){
       console.log('I am',res.ID)
       this.id = res.ID
       this.isUser(res.ID)
@@ -273,10 +270,12 @@ BoardsAPI.prototype.init = function(done){
       this.ipfs.add(new Buffer('ipfs:boards:version:'+this.version),(err,r) => {
         if(err){
           console.log('Error while calculating version hash:',err)
-        }
+          done(err)
+        } else {
           this.version_hash = r[0].Hash
           console.log('Version hash is',this.version_hash)
           done(null)
+        }
       })
     }
   })