Schema validation - new sample

doc/code_snippets/snippets/config/instances.enabled/application_validate_cfg_record_hierarchy/config.yaml

@@ -0,0 +1,13 @@
+groups:
+  group001:
+    replicasets:
+      replicaset001:
+        instances:
+          instance001:
+            roles: [ http_api ]
+            roles_cfg:
+              http_api:
+                listen_address:
+                  host: '127.0.0.1'
+                  port: 8080
+                  scheme: 'http'

doc/code_snippets/snippets/config/instances.enabled/application_validate_cfg_record_hierarchy/http_api.lua

@@ -0,0 +1,32 @@
+-- http_api.lua --
+local log = require('log').new("http_api")
+local schema = require('experimental.config.utils.schema')
+
+local listen_address_schema = schema.new('listen_address', schema.record({
+    listen_address = schema.record({
+        scheme = schema.enum({ 'http', 'https' }),
+        host = schema.scalar({ type = 'string' }),
+        port = schema.scalar({ type = 'integer' })
+    })
+}))
+
+local function validate(cfg)
+    listen_address_schema:validate(cfg)
+end
+
+local function apply(cfg)
+    local scheme = listen_address_schema:get(cfg, 'listen_address.scheme')
+    local host = listen_address_schema:get(cfg, 'listen_address.host')
+    local port = listen_address_schema:get(cfg, 'listen_address.port')
+    log.info("HTTP API endpoint: %s://%s:%d", scheme, host, port)
+end
+
+local function stop()
+    log.info("The 'http_api' role is stopped")
+end
+
+return {
+    validate = validate,
+    apply = apply,
+    stop = stop,
+}

doc/code_snippets/snippets/config/instances.enabled/application_validate_cfg_record_hierarchy/instances.yml

@@ -0,0 +1 @@
+instance001: