Applications: hello world role sample

Author: andreyaksenov

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

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+groups:
+  group001:
+    replicasets:
+      replicaset001:
+        instances:
+          instance001:
+            roles: [greeter]
+            roles_cfg:
+              greeter:
+                greeting: 'Hi'
+            iproto:
+              listen:
+              - uri: '127.0.0.1:3301'

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

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+-- greeter.lua --
+local log = require('log')
+
+local M = {}
+
+function M.validate(cfg)
+    if cfg.greeting then
+        assert(type(cfg.greeting) == "string", "'greeting' should be a string")
+        assert(cfg.greeting == ("Hi" or "Hello"), "'greeting' should be 'Hi' or 'Hello'")
+    end
+end
+
+function M.apply(cfg)
+    log.info("%s from the 'greeter' role!", cfg.greeting)
+end
+
+function M.stop(cfg)
+    log.info("The 'greeter' role is stopped")
+end
+
+return M

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

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