Servicepack basics

pr0xteus was created from Servicepack, so the make own step below already happened here; the rest of the page applies to changes in this repository. Servicepack is the starting point for a Go application with multiple long-running things to run: an API, workers, feeds, schedulers, migration commands, whatever. Clone it, make the clone yours, and put your services in internal/pkg/services/.

It is not intended to be imported wholesale into an existing project with go get.

1. Make a fresh clone yours

git clone https://github.com/psyb0t/servicepack.git my-service
cd my-service
make own MODNAME=github.com/yourname/my-service

Run that once, only in a disposable fresh clone. make own:

1. removes shipped example-* services but leaves hello-world;
2. removes the clone’s .git, module manifests, and vendor/ directory;
3. recreates the module using the supplied MODNAME while retaining the framework’s pinned dependency and tool declarations;
4. rewrites framework imports to your module path;
5. replaces this README with a project stub;
6. records the framework revision in servicepack.version if it does not already exist;
7. runs dependency and service-registration targets; and
8. initializes a new Git repository on main and creates an initial commit.

It needs Git identity configured well enough for that initial commit. Its normal dependency and generation targets run in the Docker development image; it does not reject an older host Go toolchain.

Your binary name is the final segment of MODNAME: for github.com/yourname/my-service, it is my-service.

2. Add a service

make service NAME=price-worker

That creates internal/pkg/services/price-worker/priceworker.go and then regenerates internal/pkg/services/services.gen.go. The generated file finds the service factories at runtime; do not hand-edit it.

The scaffold is intentionally boring:

func (s *PriceWorker) Run(ctx context.Context) error {
	ctx = ctxscope.Set(ctx, ctxscope.Attr("service", ServiceName))
	logger := ctxscope.GetLogger(ctx)
	logger.Info("starting service")

	<-ctx.Done()
	logger.Info("service context cancelled")

	return nil
}

Replace the wait with the real work, but keep cancellation part of the contract. Run returning a non-nil error normally starts application shutdown; see services and lifecycle for the exceptions and retry rules.

When you add, remove, rename, or materially change a service implementation, regenerate registration:

make service-registration

3. Configure and run it

Generated services load their own typed config with gonfiguration:

type Config struct {
	Endpoint string        `env:"PRICEWORKER_ENDPOINT"`
	Interval time.Duration `env:"PRICEWORKER_INTERVAL" default:"15s"`
}

Parse configuration in New, fail with context, and do not reach straight for os.Getenv:

func New() (*PriceWorker, error) {
	cfg := Config{}

	if err := gonfiguration.Parse(&cfg); err != nil {
		return nil, ctxerrors.Wrap(err, "parse price-worker config")
	}

	return &PriceWorker{config: cfg}, nil
}

Build and run:

make build
./build/my-service run

For the everyday development loop, make run-dev builds the development image and runs the application with the race detector. It is useful for the shipped examples; a made-own project usually needs its own config and services first.

Framework configuration

These names belong to the framework itself. Your services own their own configuration names.

Variable	Meaning	Default
LOG_LEVEL	debug, info, warn, or error logging threshold.	Handler default
LOG_FORMAT	json or text output.	Handler default
LOG_ADD_SOURCE	Include source location in log records.	Handler default
ENV	Environment selected by goenv.	prod
RUNNER_SHUTDOWNTIMEOUT	Whole-application graceful shutdown deadline.	10s
SERVICES_ENABLED	Comma-separated in-process service allowlist. Empty/unset means all registered services.	all

Example:

SERVICES_ENABLED=price-worker,api LOG_LEVEL=debug ./build/my-service run

Where your changes go

You are changing	Put it here
A business service	internal/pkg/services/<name>/
Service-specific config	That service’s Config struct and project env documentation
Startup/shutdown extensions	cmd/init.go hooks
Standalone application commands	cmd/commands.go
Project build behavior	Makefile or scripts/make/ overrides
Project Docker behavior	Dockerfile, Dockerfile.dev

The framework-owned directories are deliberately replaceable by make servicepack-update: internal/app/, internal/pkg/service-manager/, pkg/runner/, cmd/main.go, Makefile.servicepack, scripts/make/servicepack/, and Dockerfile.servicepack*. Do not put application-specific changes there.

Next: learn the service lifecycle, then the Docker-first development workflow.