Proxy json requests

README.md

@@ -151,6 +151,13 @@ If your Graphite composer is proteced by basic authentication, you have to ensur
 
 See http://blog.rogeriopvl.com/archives/nginx-and-the-http-options-method/ for an Nginx example.
 
+#### Alternatively, enable the built-in proxy to bypass the CORS requirement
+By setting the `USE_PROXY` environment variable to `true` the clients will make ajax requests to Tasseo's backend and it will forward them on to Graphite or InfluxDB
+```
+USE_PROXY=true
+```
+
+
 ## Alternate Backends
 
 ### Librato Metrics

lib/tasseo/views/index.haml

@@ -44,10 +44,10 @@
 
           var datasource;
 
-          var graphiteUrl = "#{ENV['GRAPHITE_URL']}";
+          var graphiteUrl = "#{ENV['GRAPHITE_URL'] && ENV['USE_PROXY'] ? '/proxy' : ENV['GRAPHITE_URL']}";
           var graphiteAuth = "#{ENV['GRAPHITE_AUTH']}";
           var libratoAuth = "#{ENV['LIBRATO_AUTH']}";
-          var influxDbUrl = "#{ENV['INFLUXDB_URL']}";
+          var influxDbUrl = "#{ENV['INFLUXDB_URL'] && ENV['USE_PROXY'] ? '/proxy' : ENV['INFLUXDB_URL']}";
           var influxDbAuth = "#{ENV['INFLUXDB_AUTH']}";
 
           if (libratoAuth != "") {

lib/tasseo/web.rb

@@ -82,6 +82,25 @@ def find_dashboards
       {'status' => 'ok'}.to_json
     end
 
+    is_influx = !!ENV["INFLUXDB_URL"]
+    data_source_url = is_influx ? ENV["INFLUXDB_URL"] : ENV["GRAPHITE_URL"]
+    auth_details = is_influx ? ENV["INFLUXDB_AUTH"] : ENV["GRAPHITE_AUTH"]
+    auth_details = auth_details.split(':') if auth_details
+    if ENV['USE_PROXY']
+      get %r{/proxy/(.*)} do
+        uri = URI("#{data_source_url}/#{params[:captures].first}?#{request.query_string}")
+        req = Net::HTTP::Get.new(uri)
+        if auth_details
+          req.basic_auth(auth_details[0], auth_details[1])
+        end
+        res = Net::HTTP.start(uri.hostname, uri.port) {|http|
+          http.request(req)
+        }
+        content_type :json
+        res.body
+      end
+    end
+
     get %r{/([\S]+)} do
       path = params[:captures].first
       if dashboards.include?(path)

spec/spec_helper.rb

@@ -3,4 +3,6 @@
   config.run_all_when_everything_filtered = true
   config.filter_run :focus
   config.order = 'random'
+  ENV["USE_PROXY"]="true"
+  ENV["GRAPHITE_URL"]="http://echo.jsontest.com"
 end

spec/web_spec.rb

@@ -15,12 +15,12 @@ def app
       before do
         header 'Accept', 'application/json'
       end
-  
+
       context 'without dashboards' do
         before do
           app.any_instance.stub(:dashboards) { [] }
         end
-        
+
         it 'should return a 204' do
           get '/'
           last_response.status.should eq(204)
@@ -89,6 +89,15 @@ def app
     end
   end
 
+  describe 'GET /proxy' do
+    context '/ JSON' do
+      it 'should return an array of dashboards' do
+        get '/proxy/foo/bar'
+        JSON.parse(last_response.body).should eq({'foo' => 'bar'})
+      end
+    end
+  end
+
   describe 'GET *' do
     context 'dashboard exists' do
       it 'should be ok' do