Errors: add our own error types.

errors.go

@@ -0,0 +1,8 @@
+package aiven
+
+import "errors"
+
+var (
+	ErrNoResponseData = errors.New("No response data available")
+	ErrInvalidHost    = errors.New("Host doesn't isn't in the correct format: `hostname:port`")
+)

project.go

@@ -105,7 +105,7 @@ func (h *ProjectsHandler) List() ([]*Project, error) {
 
 func parseProjectResponse(bts []byte) (*Project, error) {
 	if bts == nil {
-		return nil, errors.New("No response data available")
+		return nil, ErrNoResponseData
 	}
 
 	var rsp *ProjectResponse
@@ -114,7 +114,7 @@ func parseProjectResponse(bts []byte) (*Project, error) {
 	}
 
 	if rsp == nil {
-		return nil, errors.New("No response data available")
+		return nil, ErrNoResponseData
 	}
 
 	if rsp.Errors != nil && len(rsp.Errors) != 0 {

service.go

@@ -67,14 +67,14 @@ func (s *Service) Port() (string, error) {
 }
 
 func getHostPort(uri string) (string, string, error) {
-	url, err := url.Parse(uri)
+	hostUrl, err := url.Parse(uri)
 	if err != nil {
 		return "", "", err
 	}
 
-	sp := strings.Split(url.Host, ":")
+	sp := strings.Split(hostUrl.Host, ":")
 	if len(sp) != 2 {
-		return "", "", errors.New("Host doesn't exist out of hostname:port")
+		return "", "", ErrInvalidHost
 	}
 
 	return sp[0], sp[1], nil

service_user.go

@@ -39,7 +39,7 @@ func (h *ServiceUsersHandler) Create(project, service string, req CreateServiceU
 	}
 
 	if rsp == nil {
-		return nil, errors.New("No response data available")
+		return nil, ErrNoResponseData
 	}
 
 	if rsp.Errors != nil && len(rsp.Errors) != 0 {