filter out things without datastreams

backend/README.md

@@ -9,6 +9,12 @@
 
 `gem install csv`
 
+`gem install redis`
+
+`gem install rack`
+
+`gem install rack-cors`
+
 
 ## to start
 `brew services start redis`

backend/server.rb

@@ -37,14 +37,14 @@ get '/sensor/:type' do
     end
 
     body = nil
-    if($redis.exists uri)
+    if($redis.exists uri )
         body = $redis.get uri
         puts "cache hit"
     else
        pages = []
        getPageRecursive(pages,uri,false)
 
-       things = pages.map{|page|page["value"]}.flatten
+       things = pages.map{|page|page["value"]}.flatten.select{|thing|thing["Datastreams"] != nil}
 
        result = things.map{|thing|
            ds_list = thing["Datastreams"]
@@ -145,10 +145,12 @@ end
 
 
 def getPageRecursive(pages,uri,filter)
+    #start = Time.now
     response = RestClient.get uri
     page = JSON.parse(response)
     nextLink = page["@iot.nextLink"]
     nextLink = "#{nextLink}&$select=phenomenonTime,result" if(filter and nextLink != nil and not nextLink.empty?)
     pages << page
+    #puts "#{uri}: #{Time.now - start} s"
     getPageRecursive(pages,nextLink,filter) if (nextLink != nil and not nextLink.empty?)
 end