[go-kit] minio — launcher component, Checkable interface, bucket init hook #1

New Issue

claude · 2026-05-19T16:02:44-06:00

claude commented

2026-05-19 16:02:44 -06:00

Goal

Create the minio go-kit micro-lib module — a MinIO client as a launcher.Component with a launcher.Checkable interface and a BeforeStart bucket-init hook. This module follows the same pattern as postgres and valkey and will be imported by iron-dough-api to back product image storage.

Context

Iron Dough's product management feature (Feature 2) requires object storage for product images. MinIO is the chosen backend — S3-compatible, self-hosted via Docker Compose, deployed on the devtools-network. The module must be a reusable go-kit component so any future service can import it without re-implementing the wiring.

MinIO devtools instance:

API: http://minio:9000 (container DNS — never localhost)
Console: http://minio:9001
Credentials: minioadmin / minioadmin
Auth: AWS Signature V4 (handled by minio-go/v7)
Health: GET /minio/health/live → 200

Reference ADR: iron-dough-docs/docs/adr/adr-015-minio-object-storage.md

Tasks

Initialize Go module at code.nochebuena.dev/go/minio
Add dependency: github.com/minio/minio-go/v7

Define Config struct

type Config struct {
    Endpoint  string // e.g. "minio:9000"
    AccessKey string
    SecretKey string
    UseSSL    bool
    Bucket    string
}

Implement Client struct wrapping *minio.Client — satisfies launcher.Component and launcher.Checkable
- Start(ctx context.Context) error — initialize the minio-go client; verify connectivity via BucketExists or equivalent
- Stop(ctx context.Context) error — no-op (stateless client)
- Ping(ctx context.Context) error — used by the health check aggregator; call BucketExists on the configured bucket
Constructor: New(cfg Config) *Client — returns the unstarted component; Start performs actual initialization
BeforeStart bucket-init option: if the configured bucket does not exist, create it with private ACL during Start; log the creation
Expose func (c *Client) Native() *minio.Client — returns the underlying SDK client for callers that need direct access (e.g. PutObject, RemoveObject, PresignedGetObject)
Package doc comment on package minio
Unit test: mock transport to verify Start calls bucket check; verify Ping returns error when unreachable
README.md with usage example showing wiring into a launcher application

Success Criteria

go build ./... passes with no errors
go vet ./... passes
gofmt -l . returns no files
All exported symbols have doc comments
New → Start → Native() → PutObject sequence works against the devtools MinIO instance
Ping returns nil when MinIO is healthy; returns a descriptive error when the endpoint is unreachable
Bucket is created automatically on first Start if it does not exist

Reference

Pattern to follow: code.nochebuena.dev/go/valkey (launcher component + Checkable)
MinIO Go SDK: https://github.com/minio/minio-go
ADR-015: iron-dough-docs/docs/adr/adr-015-minio-object-storage.md

## Goal Create the `minio` go-kit micro-lib module — a MinIO client as a `launcher.Component` with a `launcher.Checkable` interface and a `BeforeStart` bucket-init hook. This module follows the same pattern as `postgres` and `valkey` and will be imported by `iron-dough-api` to back product image storage. ## Context Iron Dough's product management feature (Feature 2) requires object storage for product images. MinIO is the chosen backend — S3-compatible, self-hosted via Docker Compose, deployed on the `devtools-network`. The module must be a reusable go-kit component so any future service can import it without re-implementing the wiring. MinIO devtools instance: - API: `http://minio:9000` (container DNS — never `localhost`) - Console: `http://minio:9001` - Credentials: `minioadmin` / `minioadmin` - Auth: AWS Signature V4 (handled by `minio-go/v7`) - Health: `GET /minio/health/live → 200` Reference ADR: `iron-dough-docs/docs/adr/adr-015-minio-object-storage.md` ## Tasks - [ ] Initialize Go module at `code.nochebuena.dev/go/minio` - [ ] Add dependency: `github.com/minio/minio-go/v7` - [ ] Define `Config` struct ```go type Config struct { Endpoint string // e.g. "minio:9000" AccessKey string SecretKey string UseSSL bool Bucket string } ``` - [x] Implement `Client` struct wrapping `*minio.Client` — satisfies `launcher.Component` and `launcher.Checkable` - `Start(ctx context.Context) error` — initialize the minio-go client; verify connectivity via `BucketExists` or equivalent - `Stop(ctx context.Context) error` — no-op (stateless client) - `Ping(ctx context.Context) error` — used by the health check aggregator; call `BucketExists` on the configured bucket - [x] Constructor: `New(cfg Config) *Client` — returns the unstarted component; `Start` performs actual initialization - [x] `BeforeStart` bucket-init option: if the configured bucket does not exist, create it with private ACL during `Start`; log the creation - [x] Expose `func (c *Client) Native() *minio.Client` — returns the underlying SDK client for callers that need direct access (e.g. `PutObject`, `RemoveObject`, `PresignedGetObject`) - [x] Package doc comment on `package minio` - [x] Unit test: mock transport to verify `Start` calls bucket check; verify `Ping` returns error when unreachable - [x] `README.md` with usage example showing wiring into a `launcher` application ## Success Criteria - `go build ./...` passes with no errors - `go vet ./...` passes - `gofmt -l .` returns no files - All exported symbols have doc comments - `New` → `Start` → `Native()` → `PutObject` sequence works against the devtools MinIO instance - `Ping` returns nil when MinIO is healthy; returns a descriptive error when the endpoint is unreachable - Bucket is created automatically on first `Start` if it does not exist ## Reference - Pattern to follow: `code.nochebuena.dev/go/valkey` (launcher component + Checkable) - MinIO Go SDK: https://github.com/minio/minio-go - ADR-015: `iron-dough-docs/docs/adr/adr-015-minio-object-storage.md`

Rene Nochebuena closed this issue

2026-05-19 21:43:58 -06:00

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Reference: go/minio#1