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Generating Code

As GO is "a bit stiff" when it comes to generic things, we utilize code generation when possible. The core logic regarding code generation resides within the pkg/codegen package.

The definitions are provided using YAML files throughout the source; the templates are defined under the pkg/codegen/assets folder.

Running codegen

You need to remove the old codegen binary whenever the source code changes. The codegen commands will compile the binary if it’s not there.

Run the codegen by running:
make codegen
Run the codegen on change by running:
make watch.codegen
Remove the old codegen binary by running:
make clean.codegen

Extending existing codegen

Rest API

The codegen generates REST API request handlers and request parsing.

The documentation is generated using the openapi3-converter tool, not codegen.

YAML defintions:
  • */rest.yaml

Template files:
  • rest_handler.go.tpl

  • rest_request.go.tpl


The codegen generates common type set receivers and generic boilerplate logic for features such as resource labels.

YAML defintions:
  • */*/types.yaml

Template files:
  • type_labels.gen.go.tpl

  • type_set.gen.go.tpl

  • type_set.gen_test.go.tpl


The codegen generates the available service actions along with the properties and errors. These actions are primarily used for the action log.

YAML defintions:
  • */services/*_actions.yaml

Template files:
  • actions.gen.go.tpl


The codegen generates the available events that the system can emit from different services. These events are primarily used by the event bus for automation.

YAML defintions:
  • */service/event/events.yaml

Template files:
  • events.gen.adoc.tpl

  • events.gen.go.tpl

  • events.go.tpl

Store interface and implementations

The codegen generates the entire store interface. In the case of RDBMS, the implementation is also generated.

YAML defintions:
  • store/*.yaml

Template files:
  • store_base.gen.go.tpl

  • store_interfaces_joined.gen.go.tpl

  • store_partials.go.tpl

  • store_rdbms.gen.go.tpl

  • store_test_all.gen.go.tpl


The codegen generates all of the defined options accessible from the .env file variables. The options may define defaults as well as any preprocessing.

YAML defintions:
  • pkg/options/*.yaml

Template files:
  • options.gen.adoc.tpl

  • options.gen.go.tpl

Automation function handlers

The codegen generates the definitions and wrappers for function handlers. You must still define the core logic of the handler manually.

YAML defintions:
  • */automation/*_handler.yaml

Template files:
  • afunc.gen.go.tpl

Expression types

The codegen generates the expression types and casting rules. The more complex types (such as ComposeRecord) custom casting and operations may be defined manually.

YAML defintions:
  • */*/expr_types.yaml

Template files:
  • expr_types.gen.go.tpl

Defining new codegen

Use one of the existing implementations as a base and tweak it to your needs. The general outline is that you define a template, yaml files and * code that combines the two*.

Plans for the future

Define */type.yaml files that outline the structure of each known type. The same type definition should be used to extract expression types and other bits, like events.