Adding compatibility for marathon 1.5

vendor/github.com/gambol99/go-marathon/pod_container_marshalling.go

@@ -0,0 +1,94 @@
+/*
+Copyright 2017 The go-marathon Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package marathon
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+// PodContainerAlias aliases the PodContainer struct so that it will be marshaled/unmarshaled automatically
+type PodContainerAlias PodContainer
+
+// UnmarshalJSON unmarshals the given PodContainer JSON as expected except for environment variables and secrets.
+// Environment variables are stored in the Env field. Secrets, including the environment variable part,
+// are stored in the Secrets field.
+func (p *PodContainer) UnmarshalJSON(b []byte) error {
+	aux := &struct {
+		*PodContainerAlias
+		Env map[string]interface{} `json:"environment"`
+	}{
+		PodContainerAlias: (*PodContainerAlias)(p),
+	}
+	if err := json.Unmarshal(b, aux); err != nil {
+		return fmt.Errorf("malformed pod container definition %v", err)
+	}
+	env := map[string]string{}
+	secrets := map[string]Secret{}
+
+	for envName, genericEnvValue := range aux.Env {
+		switch envValOrSecret := genericEnvValue.(type) {
+		case string:
+			env[envName] = envValOrSecret
+		case map[string]interface{}:
+			for secret, secretStore := range envValOrSecret {
+				if secStore, ok := secretStore.(string); ok && secret == "secret" {
+					secrets[secStore] = Secret{EnvVar: envName}
+					break
+				}
+				return fmt.Errorf("unexpected secret field %v of value type %T", secret, envValOrSecret[secret])
+			}
+		default:
+			return fmt.Errorf("unexpected environment variable type %T", envValOrSecret)
+		}
+	}
+	p.Env = env
+	for k, v := range aux.Secrets {
+		tmp := secrets[k]
+		tmp.Source = v.Source
+		secrets[k] = tmp
+	}
+	p.Secrets = secrets
+	return nil
+}
+
+// MarshalJSON marshals the given PodContainer as expected except for environment variables and secrets,
+// which are marshaled from specialized structs.  The environment variable piece of the secrets and other
+// normal environment variables are combined and marshaled to the env field.  The secrets and the related
+// source are marshaled into the secrets field.
+func (p *PodContainer) MarshalJSON() ([]byte, error) {
+	env := make(map[string]interface{})
+	secrets := make(map[string]TmpSecret)
+
+	if p.Env != nil {
+		for k, v := range p.Env {
+			env[string(k)] = string(v)
+		}
+	}
+	if p.Secrets != nil {
+		for k, v := range p.Secrets {
+			env[v.EnvVar] = TmpEnvSecret{Secret: k}
+			secrets[k] = TmpSecret{v.Source}
+		}
+	}
+	aux := &struct {
+		*PodContainerAlias
+		Env map[string]interface{} `json:"environment,omitempty"`
+	}{PodContainerAlias: (*PodContainerAlias)(p), Env: env}
+
+	return json.Marshal(aux)
+}