working on stream download

app/controllers/db_streams_controller.rb

@@ -3,7 +3,8 @@
 # Controller for DbStreams
 # Controller for DbStreams
 class DbStreamsController < ApplicationController
 class DbStreamsController < ApplicationController
   before_action :authenticate_user!
   before_action :authenticate_user!
-  before_action :set_stream, only: [:update]
+  before_action :set_stream, only: [:update, :data]
+  before_action :authorize_viewer, only: [:data]
   before_action :authorize_owner, only: [:update]
   before_action :authorize_owner, only: [:update]
 
 
   def update
   def update
@@ -13,6 +14,11 @@ class DbStreamsController < ApplicationController
     render status: @service.success? ? :ok : :unprocessable_entity
     render status: @service.success? ? :ok : :unprocessable_entity
   end
   end
 
 
+  def data
+    headers["Content-Disposition"] = "attachment; filename='#{@db_stream.name}.txt'"
+    render :layout=>false, :content_type => "text/plain"
+  end
+
   private
   private
 
 
   def stream_params
   def stream_params

app/views/db_streams/data.csv.erb

+###############################################
+# Stream: <%=@db_stream.name%>
+# Path:   <%=@db_stream.path%>
+# Source: <%=@nilm.name%> <%unless @nilm.description.blank?%>(<%=@nilm.description%>)<%end%>
+#
+#
+# start:      --
+# end:        --
+# total time: --
+# total rows: --
+#
+#The raw data file can be retrieved at the following URL:
+# <%=@db.url%>/stream/extract?path=<%=@db_stream.path%>&start=?&end=?
+#
+# to import in matlab run:
+# 	nilm = importdata('thisfilename.txt')
+#
+# nilm.textdata: this help text
+# nilm.data:     the data
+#
+# The data has <%= @db_stream.db_elements.count+1 %> columns with the following format:
+#
+#  Column 1: Timestamp (microseconds)
+	<% col = 2%>
+	<%@db_stream.db_elements.each do |element|%>
+#  Column <%=col%>: <%=element.name%> (<%=element.units%>)
+	<%col+=1%>
+	<%end%>
+#

config/routes.rb

@@ -8,7 +8,11 @@ Rails.application.routes.draw do
   resources :data_views
   resources :data_views
   resources :dbs, only: [:show, :update]
   resources :dbs, only: [:show, :update]
   resources :db_folders, only: [:show, :update]
   resources :db_folders, only: [:show, :update]
-  resources :db_streams, only: [:update]
+  resources :db_streams, only: [:update] do
+    member do
+      post 'data'
+    end
+  end
   resources :db_elements, only: [:index] do
   resources :db_elements, only: [:index] do
     collection do
     collection do
       get 'data'
       get 'data'