refactor(*): Break apart packages

datasource/datasource.go

@@ -0,0 +1,6 @@
+package datasource
+
+type Datasource interface {
+	Fetch() ([]byte, error)
+	Type()  string
+}

datasource/file.go

@@ -0,0 +1,21 @@
+package datasource
+
+import (
+	"io/ioutil"
+)
+
+type localFile struct {
+	path string
+}
+
+func NewLocalFile(path string) *localFile {
+	return &localFile{path}
+}
+
+func (self *localFile) Fetch() ([]byte, error) {
+	return ioutil.ReadFile(self.path)
+}
+
+func (self *localFile) Type() string {
+	return "local-file"
+}

datasource/metadata_service.go

@@ -0,0 +1,38 @@
+package datasource
+
+import (
+	"io/ioutil"
+	"net/http"
+)
+
+type metadataService struct {
+	url    string
+	client http.Client
+}
+
+func NewMetadataService(url string) *metadataService {
+	return &metadataService{url, http.Client{}}
+}
+
+func (ms *metadataService) Fetch() ([]byte, error) {
+	resp, err := ms.client.Get(ms.url)
+	if err != nil {
+		return []byte{}, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode / 100 != 2 {
+		return []byte{}, nil
+	}
+
+	respBytes, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	return respBytes, nil
+}
+
+func (ms *metadataService) Type() string {
+	return "metadata-service"
+}