# logmower-shipper

Watches log directory for logs, and ships them to mongo.

- Running: `go run .`
- Building: `go build .`

## Files
0. `pkg/globals` defines globals. This is used for Prometheus namespace, and for forwarding static global CLI configuration with less clutter.
1. `main.go` serves `/metrics` and runs `watcher.go`.
2. `pkg/watcher` main routine; initializes (including `mongo.go`) and watches for new log files.
   - `pkg/mongo` provides statically safe and central tools to interact with the database.
   - `pkg/util` provides additional utility functions.
3. `pkg/file` handles file lifecycle; watches files and tails them, streaming lines to `pkg/lines`.
4. `pkg/lines` processes lines and streams them to `pkg/sender`.
5. `pkg/sender` batches lines and ships them to mongo.

```txt
┌──────────────────────────────────────────────────────────────┬─────────┐
│ List directory      New files created                        ) watcher (
│ │                    │                                       └─────────┤
│ └► Simulate initial ─┴─► File watcher ──► Parse filename (k8s)         │
│     create events                              ┌─◄───┘                 │
│                                 Ignore files   │─◄─┐Namespace filters  │
│ ┌─ Launch file collector ◄──── based on filter ┘─◄─┘Pod prefix filters │
└─▼──────────────────────────────────────────────────────────────────────┘
  │                                         ┌──────┐
  │ Retry any downstream error with backoff ) file ( ┌──────────┬────────┐
┌─▼─────────────────────────────────────────┴──────┤ │  Submit  ) sender (
│┌┴─► mongo: get offset     create channels  ┌─────► │ to mongo └────────┤
││      │                 + chan processors  │     │ ├────▲────┐         │
│└──┐───┘      ┌─────────────┘           └───┤     │ ) batcher (         │
└───▼──────────▼──────────────────────────┐  │     │ ├────▲────┼─────────┘
┌───┴────┐ ┌───────┬────────────────────┐ │  └─────► │  queue  │
) tailer ( ) lines (      combine       │ └────────┘ └────▲────┘
└───▼────┘ ├───────┘   partial lines    │                 │
    │      │            ▲       │       │   {possible processing plugins}
    └──────► parse k8s  │       ▼       │                 ▲
           │ line metadata ─────┴───────►─────────────────┘
           │                            │
           └────────────────────────────┘
```

## Skaffold
```bash
export NS=gitdbd-5cym5
kubectl apply -f k8s/dev/mongodb.yaml -n "$NS"
kubectl apply -f k8s/dev/prom.yaml -n "$NS"
skaffold dev --namespace "$NS"

hwatch kubectl get pods --namespace "$NS"
```
