helpers

README

helpers

Shared Go helpers in one module: github.com/open-rails/helpers. Requires Go 1.26.6 or newer. MigrateKit remains a separate module.

Import	Purpose	Runtime dependencies
github.com/open-rails/helpers/api	HTTP errors, responses, safe metadata and pagination	Standard library
github.com/open-rails/helpers/api/gin	Gin writers, query binding and locale helpers	API helpers and Gin
github.com/open-rails/helpers/river	Initialize River tables and compose one host-owned client	River and pgx

Import only the packages an application needs. The API core does not import Gin or River. Go builds the imported packages and their dependencies; all packages share this module's version and Go/toolchain requirements.

API helpers

The core provides typed errors, stable type/code fields, optional request IDs, bounded/sanitized metadata, JSON writers and generic list/message/deletion responses. The Gin adapter delegates to those writers and adds pagination binding and locale middleware. It does not add a router or authentication system. Existing response bytes are retained, including omitted codes/discriminators and preserved request IDs.

River composition

river.ApplyMigrations(ctx, pool, schema) creates the selected schema and applies River's migrations under a database/schema advisory lock. An empty schema means public. Schema creation happens inside the lock, and the lock uses a dedicated connection so a host pool with MaxConns=1 cannot stall itself. The host retains its pool; call this explicit initializer before starting workers or accepting requests that enqueue jobs.

river.New combines library contributions, validates registration and binds their producers to the same ordinary River client and actual host pool. Pass the same schema in riverqueue.Config.Schema; empty also means public. Construction does not migrate or start workers. The host starts/stops that client and retains ownership of the pool. These helpers add neither a scheduler nor billing logic.

When importing both the helpers and upstream River, use a descriptive alias such as riverhelpers for github.com/open-rails/helpers/river.

Migration

Replace the previous module imports with the corresponding packages in this module:

Previous import	Shared import	Package name
github.com/open-rails/apikit	github.com/open-rails/helpers/api	api
github.com/open-rails/apikit/adapters/gin	github.com/open-rails/helpers/api/gin	ginapi
github.com/open-rails/riverkit	github.com/open-rails/helpers/river	river

No forwarding packages are provided at the old import paths. Libraries and hosts that exchange River contribution types must use the shared package paths; update those libraries before updating their host composers. MigrateKit imports do not change.

The API helpers preserve APIKit's response contract. Replacing older doujins-org/ginapi writers can change envelope semantics and requires application-level compatibility checks. See the error envelope compatibility notes and frozen HTTP/parser fixtures for the recorded differences.

Validation

Use one entry point locally and in CI:

RIVER_TEST_DATABASE_URL='postgres://.../helpers_test?sslmode=disable' bash scripts/check.sh

It checks formatting, the single-module/package boundaries, vet/race tests, actual PostgreSQL River initialization/composition, the frozen frontend-parser fixtures and reachable vulnerabilities. The PostgreSQL test login must be able to create temporary test databases; tests remove only their own databases/schemas. For a quick API-only check, run go test ./api/....

api/compat contains frozen wire/parser evidence, not reverse dependencies on applications. Parser origins and test adaptations are documented in SPA parser provenance.

License

All packages are covered by the root MIT license, which retains the copyrights of Shinobi Online LLC and Paul Fidika.