77 lines
4.8 KiB
Markdown
77 lines
4.8 KiB
Markdown
# Task 1.3 — Configuration & logging
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**Phase:** 1 — Throughput pipeline
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**Status:** 🟩 Done
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**Depends on:** 1.1
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**Wiki refs:** `docs/wiki/entities/processor.md`
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## Goal
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Validate environment variables on startup with `zod`, build the pino root logger with the same conventions as `tcp-ingestion` (ISO timestamps, string level labels, instance_id base field), and fail fast with a readable error message if config is invalid.
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## Deliverables
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- `src/config/load.ts` exporting:
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- `loadConfig(): Config` — reads `process.env`, runs zod parse, returns a typed `Config`. Throws on invalid input with a multi-line message that names every invalid field.
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- `Config` type derived from the zod schema.
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- `src/observability/logger.ts` exporting:
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- `createLogger({ level, nodeEnv, instanceId }): Logger` — pino root logger with base fields `service: 'processor'`, `instance_id`. ISO timestamps via `pino.stdTimeFunctions.isoTime`. Level formatter that emits `"level":"info"` not `"level":30`. In `nodeEnv === 'development'`, use the pino-pretty transport.
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- `type Logger` re-exported from `pino`.
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- Wire both into `src/main.ts`: `loadConfig()` → `createLogger()` → `logger.info('processor starting')` → exit 0 (still a stub; consumer wiring lands in 1.8).
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## Specification
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### Environment variables
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| Var | Required | Default | Notes |
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|---|---|---|---|
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| `NODE_ENV` | no | `production` | `development` enables pino-pretty |
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| `INSTANCE_ID` | no | `processor-1` | Used in metrics + log base field |
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| `LOG_LEVEL` | no | `info` | `trace` / `debug` / `info` / `warn` / `error` |
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| `REDIS_URL` | yes | — | e.g. `redis://redis:6379` |
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| `POSTGRES_URL` | yes | — | e.g. `postgres://user:pass@db:5432/trm` |
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| `REDIS_TELEMETRY_STREAM` | no | `telemetry:t` | Must match `tcp-ingestion`'s `REDIS_TELEMETRY_STREAM` |
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| `REDIS_CONSUMER_GROUP` | no | `processor` | All Processor instances join this group |
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| `REDIS_CONSUMER_NAME` | no | `${INSTANCE_ID}` | Unique per instance — defaults to instance id |
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| `METRICS_PORT` | no | `9090` | HTTP server port for `/metrics`, `/healthz`, `/readyz` |
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| `BATCH_SIZE` | no | `100` | Max records per `XREADGROUP` call |
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| `BATCH_BLOCK_MS` | no | `5000` | `BLOCK` timeout on `XREADGROUP` when stream is empty |
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| `WRITE_BATCH_SIZE` | no | `50` | Max rows per Postgres `INSERT` |
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| `DEVICE_STATE_LRU_CAP` | no | `10000` | Max devices kept in memory; LRU eviction beyond this |
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### Validation rules
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- All defaults must be expressed in the zod schema with `.default(...)` so the parsed `Config` is fully typed and never has `undefined` for an optional field.
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- Numeric env vars must be coerced from string and bounded: `BATCH_SIZE` 1–10000, `BATCH_BLOCK_MS` 0–60000, `WRITE_BATCH_SIZE` 1–1000, `DEVICE_STATE_LRU_CAP` 100–1_000_000.
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- `REDIS_URL` and `POSTGRES_URL` must parse as URLs with the expected protocol (`redis:` or `rediss:`; `postgres:` or `postgresql:`).
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- `LOG_LEVEL` must be one of pino's accepted levels.
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### Logger conventions
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Match `tcp-ingestion/src/observability/logger.ts` line for line where applicable. Future-you grepping across services should see the same shape:
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```ts
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const formatters = { level: (label: string) => ({ level: label }) };
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if (nodeEnv === 'development') {
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return pino({ level, base, timestamp: pino.stdTimeFunctions.isoTime, formatters,
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transport: { target: 'pino-pretty', options: { colorize: true, translateTime: 'SYS:standard', ignore: 'pid,hostname' } } });
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}
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return pino({ level, base, timestamp: pino.stdTimeFunctions.isoTime, formatters });
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```
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## Acceptance criteria
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- [ ] `pnpm test` covers config validation: missing required vars throw with the right message; invalid URLs throw; bounded numerics throw on out-of-range values.
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- [ ] Running with valid env emits a single `processor starting` info log with `service=processor` and `instance_id=processor-1` base fields.
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- [ ] Running with `NODE_ENV=development` produces colorized output via pino-pretty.
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- [ ] Running with `NODE_ENV=production` produces JSON output with ISO `time` and string `level`.
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## Risks / open questions
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- `REDIS_CONSUMER_NAME` defaulting to `INSTANCE_ID` means `INSTANCE_ID` must be unique per instance for safe consumer-group operation. Document this in `.env.example` so operators don't accidentally run two instances with the same `INSTANCE_ID`.
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## Done
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Landed in `290a08e`. Implemented `src/config/load.ts` (zod schema, loadConfig) and `src/observability/logger.ts` (createLogger, pino-pretty in dev). 37 config test cases covering all defaults, missing required vars, URL protocol validation, and bounded numeric checks. Wired into `src/main.ts`. Divergence from tcp-ingestion config: `INSTANCE_ID` defaults to a fixed `'processor-1'` string rather than a random UUID prefix; rationale: operator-visible name is more useful than randomness in a containerised environment where the instance name can be set deterministically.
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