Added support for getting CFN output values in aws metadata plugin (#691)

Signed-off-by: Ken Cochrane <[email protected]>

Author: kencochrane

docs/controller/ingress/example.yml

@@ -26,7 +26,7 @@
 #m4fghruao79i        t2                  replicated          1/1                 nginx:latest        *:7777->80/tcp
 #
 # Remove the service
-# docker service rm test1
+# docker service rm t2
 #
 # infrakit simulator/lb1 routes ls  # should be empty
 #

pkg/provider/aws/plugin/metadata/funcs.go

@@ -135,9 +135,19 @@ func cfn(clients AWSClients, name string) (interface{}, error) {
 		parameters[*p.ParameterKey] = p
 	}
 
+	// index outputs by name
+	outputs := map[string]interface{}{}
+	for _, p := range output.Stacks[0].Outputs {
+		if p.OutputKey == nil {
+			continue
+		}
+		outputs[*p.OutputKey] = p
+	}
+
 	// JMESPath package has trouble with fields that are pointers
 	return template.ToMap(map[string]interface{}{
 		"Resources":  resources,
 		"Parameters": parameters,
+		"Outputs":    outputs,
 	})
 }