Schema validation: basic sample

Author: andreyaksenov

doc/code_snippets/snippets/config/instances.enabled/application_role_cfg_schema_validation/byeer.lua

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+-- byeer.lua --
+local log = require('log').new("byeer")
+
+return {
+    dependencies = { 'greeter' },
+    validate = function() end,
+    apply = function() log.info("Bye from the 'byeer' role!") end,
+    stop = function() end,
+}

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

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+groups:
+  group001:
+    replicasets:
+      replicaset001:
+        instances:
+          instance001:
+            roles: [ greeter ]
+            roles_cfg:
+              greeter:
+                greeting: 'Hi'

doc/code_snippets/snippets/config/instances.enabled/application_role_cfg_schema_validation/greeter.lua

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+-- greeter.lua --
+local log = require('log').new("greeter")
+local schema = require('experimental.config.utils.schema')
+
+local greeting_schema = schema.new('greeting', schema.record({
+    greeting = schema.enum({ 'Hi', 'Hello' })
+}))
+
+local function validate(cfg)
+    if cfg.greeting then
+        greeting_schema:validate(cfg)
+    end
+end
+
+local function apply(cfg)
+    local greeting = greeting_schema:get(cfg, 'greeting')
+    log.info("%s from the 'greeter' role!", greeting)
+end
+
+local function stop()
+    log.info("The 'greeter' role is stopped")
+end
+
+return {
+    validate = validate,
+    apply = apply,
+    stop = stop,
+}

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

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+instance001: