fix(schema): Use ingress default values

Ingress has some default values, like path and classname. We need to
ensure that values are taken or nil, and to apply them if they are not
set explicitally. Port is a sepcial case.

generator/labels/labelStructs/ingress.go

@@ -1,33 +1,43 @@
 package labelStructs
 
-import "gopkg.in/yaml.v3"
+import (
+	"fmt"
+
+	"gopkg.in/yaml.v3"
+)
 
 type TLS struct {
 	Enabled bool `yaml:"enabled" json:"enabled,omitempty"`
 }
 
 type Ingress struct {
-	Port        *int32            `yaml:"port,omitempty" jsonschema:"nullable" json:"port,omitempty"`
+	Port        *int32            `yaml:"port,omitempty" json:"port,omitempty"`
 	Annotations map[string]string `yaml:"annotations,omitempty" jsonschema:"nullable" json:"annotations,omitempty"`
 	Hostname    string            `yaml:"hostname" json:"hostname,omitempty"`
-	Path        string            `yaml:"path" json:"path,omitempty"`
-	Class       string            `yaml:"class" json:"class,omitempty" jsonschema:"default:-"`
+	Path        *string           `yaml:"path,omitempty" json:"path,omitempty"`
+	Class       *string           `yaml:"class,omitempty" json:"class,omitempty" jsonschema:"default:-"`
 	Enabled     bool              `yaml:"enabled" json:"enabled,omitempty"`
 	TLS         *TLS              `yaml:"tls,omitempty" json:"tls,omitempty"`
 }
 
 // IngressFrom creates a new Ingress from a compose service.
 func IngressFrom(data string) (*Ingress, error) {
+	strPtr := func(s string) *string {
+		return &s
+	}
 	mapping := Ingress{
 		Hostname: "",
-		Path:     "/",
+		Path:     strPtr("/"),
 		Enabled:  false,
-		Class:    "-",
+		Class:    strPtr("-"),
 		Port:     nil,
 		TLS:      &TLS{Enabled: true},
 	}
 	if err := yaml.Unmarshal([]byte(data), &mapping); err != nil {
 		return nil, err
 	}
+	if mapping.Port == nil {
+		return nil, fmt.Errorf("port is required in ingress definition")
+	}
 	return &mapping, nil
 }