Refactor resource discovery

pkg/resource/stream.go

@@ -6,17 +6,24 @@ import (
 	"io/ioutil"
 )
 
-func FromStream(path string, r io.Reader) ([]Resource, error) {
-	data, err := ioutil.ReadAll(r)
-	if err != nil {
-		return []Resource{}, err
-	}
+func FromStream(path string, r io.Reader) (<-chan Resource, <-chan error) {
+	resources := make(chan Resource)
+	errors := make(chan error)
 
-	resources := []Resource{}
-	rawResources := bytes.Split(data, []byte("---\n"))
-	for _, rawResource := range rawResources {
-		resources = append(resources, Resource{Path: path, Bytes: rawResource})
-	}
+	go func() {
+		data, err := ioutil.ReadAll(r)
+		if err != nil {
+			errors <- DiscoveryError{path, err}
+		}
 
-	return resources, nil
+		rawResources := bytes.Split(data, []byte("---\n"))
+		for _, rawResource := range rawResources {
+			resources <- Resource{Path: path, Bytes: rawResource}
+		}
+
+		close(resources)
+		close(errors)
+	}()
+
+	return resources, errors
 }