outfit thumbnails initial commit

Gemfile

@@ -41,6 +41,11 @@ gem 'newrelic_rpm'
 
 gem 'neopets', :git => 'git://github.com/matchu/neopets.git'
 
+gem "mini_magick", "~> 3.4"
+
+gem "fog", "~> 1.1.2"
+gem "carrierwave", "~> 0.5.8"
+
 group :development_async do
   # async wrappers
   gem 'eventmachine',     :git => 'git://github.com/eventmachine/eventmachine.git'

Gemfile.lock

@@ -87,6 +87,8 @@ GEM
     arel (2.0.10)
     bcrypt-ruby (2.1.4)
     builder (2.1.2)
+    carrierwave (0.5.8)
+      activesupport (~> 3.0)
     character-encodings (0.4.1)
     closure-compiler (1.1.4)
     compass (0.10.6)
@@ -100,11 +102,23 @@ GEM
       eventmachine
     erubis (2.6.6)
       abstract (>= 1.0.0)
+    excon (0.9.6)
     factory_girl (2.3.2)
       activesupport
     factory_girl_rails (1.4.0)
       factory_girl (~> 2.3.0)
       railties (>= 3.0.0)
+    fog (1.1.2)
+      builder
+      excon (~> 0.9.0)
+      formatador (~> 0.2.0)
+      mime-types
+      multi_json (~> 1.0.3)
+      net-scp (~> 1.0.4)
+      net-ssh (>= 2.1.3)
+      nokogiri (~> 1.5.0)
+      ruby-hmac
+    formatador (0.2.1)
     haml (3.0.25)
     hoptoad_notifier (2.4.11)
       activesupport
@@ -122,8 +136,14 @@ GEM
       treetop (~> 1.4.8)
     memcache-client (1.8.5)
     mime-types (1.17.2)
+    mini_magick (3.4)
+      subexec (~> 0.2.1)
     msgpack (0.4.6)
+    multi_json (1.0.4)
     mysql2 (0.2.6)
+    net-scp (1.0.4)
+      net-ssh (>= 1.99.1)
+    net-ssh (2.3.0)
     newrelic_rpm (3.3.3)
     nokogiri (1.5.3)
     open4 (1.3.0)
@@ -189,6 +209,7 @@ GEM
     sinatra (1.2.8)
       rack (~> 1.1)
       tilt (>= 1.2.2, < 2.0)
+    subexec (0.2.1)
     swf_converter (0.0.3)
     thor (0.14.6)
     tilt (1.3.3)
@@ -213,6 +234,7 @@ PLATFORMS
 DEPENDENCIES
   RocketAMF!
   addressable
+  carrierwave (~> 0.5.8)
   character-encodings (~> 0.4.1)
   compass (~> 0.10.1)
   devise (~> 1.1.5)
@@ -221,10 +243,12 @@ DEPENDENCIES
   em-synchrony!
   eventmachine!
   factory_girl_rails (~> 1.0)
+  fog (~> 1.1.2)
   haml (~> 3.0.18)
   hoptoad_notifier
   jammit (~> 0.5.3)
   memcache-client (~> 1.8.5)
+  mini_magick (~> 3.4)
   msgpack (~> 0.4.3)
   mysql2 (< 0.3)
   mysqlplus!

app/models/outfit.rb

@@ -12,6 +12,8 @@ class Outfit < ActiveRecord::Base
   attr_accessible :name, :pet_state_id, :starred, :worn_and_unworn_item_ids
 
   scope :wardrobe_order, order('starred DESC', :name)
+  
+  mount_uploader :image, OutfitImageUploader
 
   def as_json(more_options={})
     serializable_hash :only => [:id, :name, :pet_state_id, :starred],
@@ -70,6 +72,22 @@ class Outfit < ActiveRecord::Base
   def layered_assets
     visible_assets.sort { |a, b| a.zone.depth <=> b.zone.depth }
   end
+  
+  # Creates and writes the thumbnail images for this outfit. (Writes to file in
+  # development, S3 in production.) Runs #save! on the record, so any other
+  # changes will also be saved.
+  def write_image!
+    Tempfile.open(['outfit_image', '.png']) do |image|
+      create_image! image
+      self.image = image
+      save!
+    end
+    self.image
+  end
+  
+  def s3_key(size)
+    URI.encode("#{id}/#{size.join 'x'}.png")
+  end
 
   def self.build_for_user(user, params)
     Outfit.new.tap do |outfit|
@@ -87,6 +105,28 @@ class Outfit < ActiveRecord::Base
   
   protected
   
+  # Creates a 600x600 PNG image of this outfit, writing to the given output
+  # file.
+  def create_image!(output)
+    layers = self.layered_assets
+    base_layer = layers.shift
+    write_temp_swf_asset_image! base_layer, output
+    output.close
+
+    Tempfile.open(['outfit_overlay', '.png']) do |overlay|
+      layers.each do |layer|
+        overlay.open
+        write_temp_swf_asset_image! layer, overlay
+        overlay.close
+        
+        previous_image = MiniMagick::Image.open(output.path)
+        overlay_image = MiniMagick::Image.open(overlay.path)
+        output_image = previous_image.composite(overlay_image)
+        output_image.write output.path
+      end
+    end
+  end
+  
   def visible_assets
     biology_assets = pet_state.swf_assets
     object_assets = SwfAsset.object_assets.
@@ -110,5 +150,15 @@ class Outfit < ActiveRecord::Base
     all_assets = biology_assets + object_assets
     all_assets.select { |a| (1 << (a.zone_id - 1)) & restricted_zones_mask == 0 }
   end
+  
+  IMAGE_BASE_SIZE = [600, 600]
+  def write_temp_swf_asset_image!(swf_asset, file)
+    key = swf_asset.s3_key(IMAGE_BASE_SIZE)
+    bucket = SwfAsset::IMAGE_BUCKET
+    data = bucket.get(key)
+    file.binmode # write in binary mode
+    file.truncate(0) # clear the file
+    file.write data # write the new data
+  end
 end
 

app/models/outfit_image_uploader.rb

@@ -0,0 +1,31 @@
+require 'carrierwave/processing/mime_types'
+
+class OutfitImageUploader < CarrierWave::Uploader::Base
+  include CarrierWave::MimeTypes
+  include CarrierWave::MiniMagick
+  
+  # Settings for S3 storage. Will only be used on production.
+  fog_directory 'impress-outfit-images'
+  fog_attributes 'Cache-Control' => "max-age=#{15.minutes}",
+    'Content-Type' => 'image/png'
+  
+  process :set_content_type
+  
+  version :medium do
+    process :resize_to_fill => [300, 300]
+  end
+  
+  version :small do
+    process :resize_to_fill => [150, 150]
+  end
+  
+  def filename
+    "thumb.png"
+  end
+  
+  def store_dir
+    partition_id = model.id / 1000
+    partition_dir = "%03d" % partition_id
+    "outfits/#{partition_dir}/#{model.id}"
+  end
+end

config/initializers/carrierwave.rb

@@ -0,0 +1,20 @@
+# By default, we'll have CarrierWave use S3 only on production. (Since each
+# asset image has only One True Image no matter the environment, we'll override
+# this to use S3 on all environments for those images only.)
+
+CarrierWave.configure do |config|
+  if Rails.env.production? || true # REMOVE
+    s3_config = YAML.load_file Rails.root.join('config', 'aws_s3.yml')
+    access_key_id = s3_config['access_key_id']
+    secret_access_key = s3_config['secret_access_key']
+    
+    config.storage = :fog
+    config.fog_credentials = {
+      :provider               => 'AWS',
+      :aws_access_key_id      => access_key_id,
+      :aws_secret_access_key  => secret_access_key
+    }
+  else
+    config.storage = :file
+  end
+end

db/migrate/20120308205324_add_image_to_outfits.rb

@@ -0,0 +1,9 @@
+class AddImageToOutfits < ActiveRecord::Migration
+  def self.up
+    add_column :outfits, :image, :string
+  end
+
+  def self.down
+    remove_column :outfits, :image
+  end
+end