Load all data files from a single archive

src/client/models/base_model.coffee

@@ -19,10 +19,10 @@ module.exports = class BaseModel extends Backbone.Model
             continue if name is 'id'
             Object.defineProperty this, name, get:makeGetter(name), set:makeSetter(name)
 
+        @fileCache = options.fileCache or null
+        @loading   = null
         @logEvents = options.logEvents or false
-        @state  = c.modelState.unloaded
+        @state     = c.modelState.unloaded
-
-        @loading = null
 
         Object.defineProperties this,
             isUnloaded: { get:-> @state is c.modelState.unloaded }
@@ -60,12 +60,24 @@ module.exports = class BaseModel extends Backbone.Model
 
         @state = c.modelState.loading
         @trigger c.event.request, this
-        @loading = w.promise (resolve, reject)=>
+
-            $.ajax
+        loadFromServer = =>
-                url:      url
+            w.promise (resolve, reject)=>
-                dataType: 'text'
+                $.ajax
-                success:  (text, status, xhr)=> resolve @onLoadSucceeded text, status, xhr
+                    url:      url
-                error:    (xhr, status, error)=> reject @onLoadFailed error, status, xhr
+                    dataType: 'text'
+                    success:  (text, status, xhr)=> resolve @onLoadSucceeded text, status, xhr
+                    error:    (xhr, status, error)=> reject @onLoadFailed error, status, xhr
+
+        if @fileCache?
+            @loading = @fileCache.loading.then =>
+                if @fileCache.hasFile url
+                    @onLoadSucceeded @fileCache.getFile(url), 'success', {url:url}
+                    return w.resolve(true)
+                else
+                    @loading = loadFromServer()
+        else
+            @loading = loadFromServer()
 
         @loading.catch (e)-> # do nothing
         return @loading

src/client/models/event_recorder.coffee

@@ -1,9 +1,9 @@
-###
+#
 # Crafting Guide - event_recorder.coffee
 #
-# Copyright (c) 2014-2015 by Redwood Labs
+# Copyright © 2014-2016 by Redwood Labs
 # All rights reserved.
-###
+#
 
 util = require 'util'
 

src/client/models/game/mod.coffee

@@ -129,6 +129,7 @@ module.exports = class Mod extends BaseModel
 
         @_modVersions.push modVersion
         @listenTo modVersion, c.event.change, => @trigger c.event.change, this
+        modVersion.fileCache = this.fileCache
         modVersion.mod = this
 
         @trigger c.event.add + ':modVersion', modVersion, this

src/client/models/site/file_cache.coffee

@@ -0,0 +1,86 @@
+#
+# Crafting Guide - file_cache.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+########################################################################################################################
+
+module.exports = class FileCache extends Backbone.Events
+
+    @::FILE_TOKEN = '#file='
+
+    constructor: (url)->
+        @_ajax    = $.ajax
+        @_files   = {}
+        @_loading = w.resolve(true)
+
+        if url? then @loadArchive(url).catch(->)
+
+    # Public Methods ###############################################################################
+
+    getFile: (file)->
+        return null unless @hasFile file
+        return @_files[file]
+
+    hasFile: (file)->
+        return @_files[file]?
+
+    loadArchive: (url)->
+        if not _.isFunction(@_ajax) then throw new Error '$.ajax is required'
+
+        newLoading = w.promise (resolve, reject)=>
+            @_ajax
+                url:      url
+                dataType: 'text'
+                success:  (text, status, xhr)=> resolve @_onLoadSuccess text, status, xhr
+                error:    (xhr, status, error)=> resolve @_onLoadError error, status, xhr
+
+        @_loading = w.join @_loading, newLoading
+
+    # Property Methods #############################################################################
+
+    Object.defineProperties @prototype,
+
+        loading:
+            get: -> return @_loading
+
+    # Private Methods ##############################################################################
+
+    _onLoadError: (error, status, xhr)->
+        console.error "Failed to load archive: #{xhr.responseText}"
+        return false
+
+    _onLoadSuccess: (text, status, xhr)->
+        return @_parseArchive text
+
+    _parseArchive: (text)->
+        file = null
+        tokenIndex = nameStartIndex = nameEndIndex = fileStartIndex = fileEndIndex = 0
+        fileCount = 0
+
+        while true
+            tokenIndex = text.indexOf @FILE_TOKEN, fileStartIndex
+            if tokenIndex is -1
+                if file?
+                    @_files[file] = text.substring fileStartIndex, text.length
+                    fileCount += 1
+                break
+
+            if file?
+                fileEndIndex = tokenIndex - 1
+                @_files[file] = text.substring fileStartIndex, fileEndIndex
+                fileCount += 1
+
+            nameStartIndex = tokenIndex + @FILE_TOKEN.length
+            nameEndIndex = text.indexOf '\n', nameStartIndex
+            if nameEndIndex is -1
+                file = text.substring nameStartIndex, text.length
+                @_files[file] = ''
+                break
+
+            file = text.substring nameStartIndex, nameEndIndex
+            fileStartIndex = nameEndIndex + '\n'.length
+
+        return fileCount > 0

src/client/models/site/file_cache.test.coffee

@@ -0,0 +1,63 @@
+
+FileCache = require './file_cache'
+
+########################################################################################################################
+
+describe 'file_cache.coffee', ->
+
+    beforeEach ->
+        @cache = new FileCache
+
+    makeTestAjax = (text)->
+        return (options)->
+            options.success text, 'success', {url:options.url}
+
+    it 'can load an archive with a single file', ->
+        @cache._ajax = makeTestAjax '#file=alpha\nbravo charlie delta'
+        @cache.loadArchive 'http://test'
+            .then =>
+                @cache.hasFile('alpha').should.equal true
+                @cache.getFile('alpha').should.equal 'bravo charlie delta'
+
+    it 'can load an archive with multiple files', ->
+        @cache._ajax = makeTestAjax '#file=alpha\nbravo charlie\n#file=delta\necho foxtrot'
+        @cache.loadArchive 'http://test'
+            .then =>
+                @cache.hasFile('alpha').should.equal true
+                @cache.getFile('alpha').should.equal 'bravo charlie'
+                @cache.hasFile('delta').should.equal true
+                @cache.getFile('delta').should.equal 'echo foxtrot'
+
+    it 'can cope with an empty file in the middle of an archive', ->
+        @cache._ajax = makeTestAjax '#file=alpha\nbravo charlie\n#file=delta\n#file=echo\nfoxtrot golf'
+        @cache.loadArchive 'http://test'
+            .then =>
+                @cache.hasFile('alpha').should.equal true
+                @cache.getFile('alpha').should.equal 'bravo charlie'
+                @cache.hasFile('delta').should.equal true
+                @cache.getFile('delta').should.equal '\n'
+                @cache.hasFile('echo').should.equal true
+                @cache.getFile('echo').should.equal 'foxtrot golf'
+
+    it 'can cope with an empty file at the end of an archive', ->
+        @cache._ajax = makeTestAjax '#file=alpha\nbravo charlie\n#file=delta'
+        @cache.loadArchive 'http://test'
+            .then =>
+                @cache.hasFile('alpha').should.equal true
+                @cache.getFile('alpha').should.equal 'bravo charlie'
+                @cache.hasFile('delta').should.equal true
+                @cache.getFile('delta').should.equal ''
+
+    it 'can load multiple, non-overlapping archives', ->
+        @cache._ajax = makeTestAjax '#file=alpha\nbravo charlie\n#file=delta\necho foxtrot'
+        @cache.loadArchive 'http://test'
+
+        @cache._ajax = makeTestAjax '#file=golf\nhotel india'
+        @cache.loadArchive 'http://test2'
+            .then =>
+                @cache.hasFile('alpha').should.equal true
+                @cache.getFile('alpha').should.equal 'bravo charlie'
+                @cache.hasFile('delta').should.equal true
+                @cache.getFile('delta').should.equal 'echo foxtrot'
+                @cache.hasFile('golf').should.equal true
+                @cache.getFile('golf').should.equal 'hotel india'

src/client/site/site_controller.coffee

@@ -7,6 +7,7 @@
 
 BaseController     = require './base_controller'
 FeedbackController = require './feedback/feedback_controller'
+FileCache          = require '../models/site/file_cache'
 FooterController   = require './footer/footer_controller'
 GitHubUser         = require '../models/site/github_user'
 HeaderController   = require './header/header_controller'
@@ -26,8 +27,9 @@ module.exports = class SiteController extends BaseController
         super options
 
         @client      = options.client
+        @fileCache   = new FileCache c.url.modpackArchive()
         @imageLoader = new ImageLoader defaultUrl:'/images/unknown.png'
-        @modPack     = new ModPack
+        @modPack     = new ModPack {}, fileCache:@fileCache
         @router      = new Router this
         @storage     = options.storage
 
@@ -42,7 +44,7 @@ module.exports = class SiteController extends BaseController
             m.activeModVersion.fetch() if m.activeModVersion?
 
         for modSlug, modData of c.defaultMods
-            mod = new Mod slug:modSlug
+            mod = new Mod {slug:modSlug}, {fileCache:@fileCache}
             mod.on c.event.change + ':activeModVersion', makeResponder mod
             @storage.register "mod:#{mod.slug}", mod, 'activeVersion', modData.defaultVersion
             mod.fetch()

src/common/constants.coffee

@@ -138,6 +138,7 @@ url.login            = _.template "/login"
 url.mod              = _.template "/browse/<%= modSlug %>/"
 url.modData          = _.template "/data/<%= modSlug %>/mod.cg"
 url.modIcon          = _.template "/data/<%= modSlug %>/icon.png"
+url.modpackArchive   = _.template "/data/modpack.cg"
 url.modVersionData   = _.template "/data/<%= modSlug %>/versions/<%= modVersion %>/mod-version.cg"
 url.root             = _.template "/"
 url.tutorial         = _.template "/browse/<%= modSlug %>/tutorials/<%= tutorialSlug %>/"