create: add template for non-vshard cluster

Closes #1182

@TarantoolBot document
Title: `tt create` add template for non-vshard cluster.

Configurable parameters:
- Number of replicasets
- Number of replicas per replicaset
- User name
- Password

Author: elhimov

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 
 - `tt create`: add template for Tarantool Config Storage.
+- `tt create`: add template for non-vshard Cluster.
 
 ### Changed
 

cli/cmd/create.go

@@ -44,6 +44,7 @@ func NewCreateCmd() *cobra.Command {
 Built-in templates:
 	cartridge: a simple Cartridge application.
 	single_instance: Tarantool 3 application with a single instance configuration.
+	cluster: Tarantool 3 cluster application.
 	vshard_cluster: Tarantool 3 vshard cluster application.
 	config_storage: Tarantool 3 cluster configuration storage.`,
 		Example: `

cli/cmd/create_test.go

@@ -42,6 +42,7 @@ func TestCreateValidArgsFunction(t *testing.T) {
 		"vshard_cluster",
 		"single_instance",
 		"config_storage",
+		"cluster",
 		"archive",
 		"template2",
 		tdir1Name,

cli/codegen/generate_code.go

@@ -144,6 +144,14 @@ func main() {
 	if err != nil {
 		log.Errorf("error while generating file modes: %s", err)
 	}
+	err = generateFileModeFile(
+		"cli/create/builtin_templates/templates/cluster",
+		"cli/create/builtin_templates/static/cluster_template_filemodes_gen.go",
+		"Cluster",
+	)
+	if err != nil {
+		log.Errorf("error while generating file modes: %s", err)
+	}
 
 	if err = generateLuaCodeVar(); err != nil {
 		log.Errorf("error while generating lua code string variables: %s", err)

cli/create/builtin_templates/builtin_templates.go

@@ -15,6 +15,7 @@ var FileModes = map[string]map[string]int{
 	"vshard_cluster":  static.VshardClusterFileModes,
 	"single_instance": static.SingleInstanceFileModes,
 	"config_storage":  static.ConfigStorageFileModes,
+	"cluster":         static.ClusterFileModes,
 }
 
 // Names contains built-in template names.
@@ -23,4 +24,5 @@ var Names = [...]string{
 	"vshard_cluster",
 	"single_instance",
 	"config_storage",
+	"cluster",
 }

cli/create/builtin_templates/templates/cluster/MANIFEST.yaml

@@ -0,0 +1,27 @@
+description: Cluster template
+follow-up-message: |
+  What's next?
+  Start '{{ .name }}' application:
+      $ tt start {{ .name }}
+
+  Pay attention that default user and password were generated
+  for the 'replication' role, you can change it in the config.yaml.
+
+vars:
+  - prompt: Number of replication sets
+    name: num_replicasets
+    default: '2'
+    re: ^[1-9]\d*$
+
+  - prompt: Number of replicas per replication set (>=2)
+    name: num_replicas
+    default: '2'
+    re: ^[2-9]|[1-9]\d+$
+
+  - prompt: User name
+    name: username
+    default: 'client'
+
+  - prompt: Password
+    name: password
+    default: 'secret'

cli/create/builtin_templates/templates/cluster/app.lua

@@ -0,0 +1,6 @@
+log = require('log')
+
+local app_name = os.getenv('TARANTOOL_APP_NAME')
+local inst_name = os.getenv('TARANTOOL_INSTANCE_NAME')
+
+log.info(('%s:%s is started'):format(app_name, inst_name))

cli/create/builtin_templates/templates/cluster/config.yaml.tt.template

@@ -0,0 +1,35 @@
+credentials:
+  users:
+    {{.username}}:
+      password: '{{.password}}'
+      roles: [super]
+    replicator:
+      password: 'topsecret'
+      roles: [replication]
+
+iproto:
+  advertise:
+    peer:
+      login: replicator
+
+replication:
+  failover: manual
+
+groups:
+  group-001:
+    app:
+      file: 'app.lua'
+    replicasets:
+{{- $num_replicasets := atoi .num_replicasets}}
+{{- $num_replicas := atoi .num_replicas}}
+{{- range replicasets "replicaset" $num_replicasets $num_replicas}}
+      {{.Name}}:
+        leader: {{index .InstNames 0}}
+        instances:
+{{- range .InstNames}}
+          {{.}}:
+            iproto:
+              listen:
+              - uri: 127.0.0.1:{{port}}
+{{- end}}
+{{- end}}

cli/create/builtin_templates/templates/cluster/instances.yaml.tt.template

@@ -0,0 +1,8 @@
+---
+{{- $num_replicasets := atoi .num_replicasets}}
+{{- $num_replicas := atoi .num_replicas}}
+{{- range replicasets "replicaset" $num_replicasets $num_replicas}}
+{{- range .InstNames}}
+{{.}}:
+{{- end}}
+{{- end}}