config/network: Prepare for multiple networks

This commit futures proofs the code to allow for usage of more than one
docker network.

internal/config/config.yml

@@ -45,7 +45,8 @@ theme:
   home: null
 
 docker:
-  # The name of the (global) docker network to run the distillery services in.
+  # The distillery uses several global docker networks.
+  # This determines the prefix to use for those networks.
   network: null
 
 # Configuration of the sql backend

internal/config/docker.go

@@ -1,6 +1,15 @@
 package config
 
 type DockerConfig struct {
-	// name of docker network to use
-	Network string `yaml:"network" default:"distillery" validate:"nonempty"`
+	NetworkPrefix string `yaml:"network" default:"distillery" validate:"nonempty"`
+}
+
+// Networks returns a list of all docker networks to be created for purposes of the distillery.
+func (dc DockerConfig) Networks() []string {
+	return []string{dc.Network()}
+}
+
+// Network returns the name of the default network to attach all docker containers to.
+func (dc DockerConfig) Network() string {
+	return dc.NetworkPrefix
 }

internal/config/template.go

@@ -22,8 +22,8 @@ type Template struct {
 	SQLAdminUsername string
 	SQLAdminPassword string
 
-	DockerNetworkName string
-	SessionSecret     string
+	DockerNetworkPrefix string
+	SessionSecret       string
 }
 
 // SetDefaults sets defaults on the template
@@ -58,12 +58,12 @@ func (tpl *Template) SetDefaults() (err error) {
 		}
 	}
 
-	if tpl.DockerNetworkName == "" {
-		tpl.DockerNetworkName, err = password.Generate(rand.Reader, 10, passwordx.Identifier)
+	if tpl.DockerNetworkPrefix == "" {
+		tpl.DockerNetworkPrefix, err = password.Generate(rand.Reader, 10, passwordx.Identifier)
 		if err != nil {
 			return err
 		}
-		tpl.DockerNetworkName = `distillery-` + tpl.DockerNetworkName
+		tpl.DockerNetworkPrefix = `distillery-` + tpl.DockerNetworkPrefix
 	}
 
 	if tpl.SessionSecret == "" {
@@ -93,7 +93,7 @@ func (tpl Template) Generate() Config {
 			ExtraDomains:  []string{},
 		},
 		Docker: DockerConfig{
-			tpl.DockerNetworkName,
+			NetworkPrefix: tpl.DockerNetworkPrefix,
 		},
 		SQL: SQLConfig{
 			DatabaseConfig: DatabaseConfig{