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95 lines
3.8 KiB
Markdown
95 lines
3.8 KiB
Markdown
# miti-loki
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A Cloudflare Worker that forwards logs to [My Grafana Cloud](https://miti99.grafana.net)'s Loki.
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## Usage
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POST a JSON body to `https://miti-loki.tiennm99.workers.dev/`. GET redirects to this repo. Any other method returns 405; missing/empty body returns 400.
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### Single log entry
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```bash
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curl -X POST 'https://miti-loki.tiennm99.workers.dev/?app=demo&env=prod' \
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-H 'Content-Type: application/json' \
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-d '{"message": "Hello from miti-loki"}'
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```
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### Batch (array of entries)
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```bash
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curl -X POST 'https://miti-loki.tiennm99.workers.dev/?app=demo' \
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-H 'Content-Type: application/json' \
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-d '[{"message":"first"},{"message":"second"}]'
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```
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### Body schema
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Each entry is `{message, timestamp?, metadata?}`:
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- `message` (string, required) — log line.
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- `timestamp` (string, optional) — Unix nanoseconds. Defaults to current time.
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- `metadata` (object, optional) — flat key-value pairs (no nested objects). Merged ON TOP of auto-injected metadata; caller wins on key collision.
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### Stream labels
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URL query params become Loki stream labels. Label names must match `[a-zA-Z_:][a-zA-Z0-9_:]*` and cannot both start and end with `_` (reserved). Invalid labels return 400.
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Auto-injected labels (overwrite caller-supplied values on collision):
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- `proxy=miti-loki`
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- `country` — from `request.cf.country` (`unknown` if absent)
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- `region` — from `request.cf.region` (`unknown` if absent)
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- `timezone` — from `request.cf.timezone` (`unknown` if absent)
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> **Breaking change (v2):** `ip` was previously a stream label. It is now per-entry structured metadata (see below). Rewrite `{ip="..."}` queries as `{proxy="miti-loki"} | ip="..."`.
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### Auto-injected per-entry metadata
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Every log entry is enriched with these structured-metadata fields. Caller-supplied `metadata.<key>` wins on collision; missing values become string `"unknown"`.
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- `ip` — from `CF-Connecting-IP` / `X-Forwarded-For` / `X-Real-IP`
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- `user_agent` — `User-Agent` header
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- `city` — `request.cf.city`
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- `latitude`, `longitude` — `request.cf.latitude` / `.longitude`
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- `url` — full request URL (incl. query string)
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- `cf_ray` — `CF-Ray` header (per-request trace ID for CF support)
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- `referer` — `Referer` header
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### LogQL examples
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```logql
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{proxy="miti-loki", country="VN"} # filter by low-cardinality label
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{proxy="miti-loki"} | ip="1.2.3.4" # filter by structured metadata
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{proxy="miti-loki", app="demo"} | user_agent=~"curl/.*"
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```
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### Errors
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- `400` — empty body, invalid JSON, missing `message`, nested metadata, or invalid label name.
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- `405` — non-POST/GET/OPTIONS method.
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- `500` — worker missing `LOKI_HOST` / `LOKI_USERNAME` / `LOKI_PASSWORD` env vars (deploy-time issue, not caller-fixable), or upstream fetch error.
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- Otherwise the response status, body, and content-type are passed through from Loki's `/loki/api/v1/push`.
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Responses are CORS-permissive (`Access-Control-Allow-Origin: *`, `POST, OPTIONS` allowed).
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### Env vars (deploy-time)
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- `LOKI_HOST` — Loki host (e.g. `logs-prod-XXX.grafana.net`).
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- `LOKI_USERNAME` — Basic Auth user (Grafana Cloud instance ID).
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- `LOKI_PASSWORD` — Basic Auth password (Grafana Cloud API token).
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- `LOKI_PORT` (optional) — defaults to `443` (HTTPS). Any other value uses HTTP.
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### For AI agents / Claude Code routines
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Read this section first, do not probe.
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- **One POST per intended log batch.** Do not send a `"test"` payload to verify the endpoint — every successful POST writes to Loki, so probes pollute the log stream.
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- **Exact request:**
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```
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POST https://miti-loki.tiennm99.workers.dev/?<label>=<value>&...
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Content-Type: application/json
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{"message": "<your log>"}
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```
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- **Success:** any 2xx (typically 204 from Loki). **Auth-related errors:** 500 (env vars missing — deploy-time issue).
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- **Do not retry on 2xx.** Each POST is a separate ingest; a retry would duplicate log lines.
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