openai-status-bot/plans/260626-1057-redis-to-mongodb/phase-04-config-wiring-deployment.md

phase, title, status, effort

phase	title	status	effort
4	Config Wiring & Deployment	complete	S

Phase 4: Config Wiring & Deployment

Overview

Replace Redis configuration, connection bootstrap, and deployment artifacts with MongoDB equivalents. After this phase main.go builds the Mongo client; consumer type swap is Phase 5.

Requirements

• New env: MONGODB_URI (Atlas mongodb+srv://..., required, no localhost default — there is no local DB), MONGODB_DATABASE (default openai_status_bot; dev env sets a separate name e.g. openai_status_bot_dev). Remove REDIS_URL.
• main.go connects, pings, ensures indexes, constructs mongostore.New(client, dbName).
• Deployment (validated): Atlas for both prod and dev — single cluster, two databases differentiated by MONGODB_DATABASE. No local mongo service in any compose file.

Architecture

config.Config: replace RedisOptions *redis.Options with MongoURI string + MongoDatabase string. Drop parseRedisURL, minRedisDB/maxRedisDB. Validation: MONGODB_URI required (error if empty, like TELEGRAM_BOT_TOKEN at config.go:35-38 — no localhost fallback since both envs use Atlas); MONGODB_DATABASE defaults to openai_status_bot. Keep validation minimal; the driver validates the URI on connect/ping.

Related Code Files

• Modify: internal/config/config.go — swap Redis fields/parsing for Mongo fields; keep getEnv default pattern.
• Modify: internal/config/config_test.go — replace Redis URL cases with Mongo URI/DB cases.
• Modify: cmd/openai-status-bot/main.go — replace redis.NewClient+Ping (main.go:37-42) with mongo.Connect(options.Client().ApplyURI(cfg.MongoURI)), client.Ping, defer client.Disconnect(ctx); call store.EnsureIndexes(ctx); store := mongostore.New(client, cfg.MongoDatabase). Update the connect-error log fields (drop redis-specific Network/Addr/DB/TLS).
• Modify: .env.example — MONGODB_URI=mongodb+srv://<user>:<pass>@<cluster>/ (placeholder), MONGODB_DATABASE=openai_status_bot; remove REDIS_URL.
• Modify: docker-compose.yml — remove the redis service and redis-data volume entirely (no local DB). Becomes bot-only, connecting to Atlas via .env; this is the development path, so set MONGODB_DATABASE to the dev database (e.g. openai_status_bot_dev). No depends_on.
• Modify: docker-compose.bot.yml — bot-only, connects to Atlas via .env with the production MONGODB_DATABASE (openai_status_bot). With no local DB, this and docker-compose.yml differ only by database name; keep both for the dev/prod split. Optionally collapse to one file — but keeping both matches the existing two-file convention (YAGNI: don't restructure beyond the DB-name change).
• Modify: README.md — Configuration table (MONGODB_URI, MONGODB_DATABASE rows; drop REDIS_URL and the percent-encoding note, or rewrite the note for Atlas SRV URIs), feature bullet "Uses Redis for…" → MongoDB, Compose/Quick-Start description (Atlas, no local DB; dev vs prod database), intro line. Note that no local datastore runs in Compose — an Atlas URI is required to start.

Implementation Steps

1. Edit config.go + config_test.go; go test ./internal/config/.
2. Edit main.go for Mongo client lifecycle + EnsureIndexes. (Will not fully build until Phase 5 swaps redisstore→mongostore in poller/bot — acceptable; Phases 4-5 land together.)
3. Update .env.example, both compose files, README.

Success Criteria

• config package + tests pass with Mongo env vars; no Redis symbols remain in config.
• main.go opens/pings Mongo, ensures indexes, builds mongostore.
• Compose, .env.example, README reference only MongoDB.

Risk Assessment

• Risk: managed URIs carry credentials/+srv. Mitigation: ApplyURI handles mongodb+srv://; never log the URI (log db name only); keep .env out of git (already in .gitignore).
• Risk: dropping REDIS_URL breaks existing deploys silently. Mitigation: README "Notes" + this plan flag the env rename; no compatibility shim (clean cutover, intended).