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statuspage: monitor lab/home machines with a small status page

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Go backend probes machines over ICMP/TCP, runs a configurable script over
SSH for checks and numeric metrics, and keeps history in SQLite. Preact +
Vite frontend shows machine groups, per-machine metric plots, and
cross-machine metric aggregates.

- server/: status, history, metrics, aggregate, refresh APIs
- src/: Preact + Vite frontend
- Single YAML config; documented example in example.config.yaml
- SQLite data stored under data.volume/ (bind-mounted in Docker)
- Multi-stage alpine Dockerfile with BuildKit cache mounts
- LICENSE: AGPL-3.0
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aziis98
2026-08-01 02:27:47 +02:00
commit 95eab7f584
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.gitignore
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# dependencies (bun install)
node_modules
# output
out
dist
*.tgz
# code coverage
coverage
*.lcov
# logs
logs
_.log
report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
# dotenv environment variable files
.env
.env.development.local
.env.test.local
.env.production.local
.env.local
# caches
.eslintcache
.cache
*.tsbuildinfo
# IntelliJ based IDEs
.idea
# Finder (MacOS) folder config
.DS_Store
bin/
*.db
*.db-wal
*.db-shm
# local configs (contain ssh keys)
*.local*
# docker data volume
data.volume/
Dockerfile
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# syntax=docker/dockerfile:1.7
FROM oven/bun:1-alpine AS frontend
WORKDIR /ui
COPY package.json bun.lock ./
RUN --mount=type=cache,target=/root/.bun/install/cache \
bun install --frozen-lockfile
COPY . .
RUN bun run build
FROM golang:1.26-alpine AS backend
RUN apk add --no-cache build-base
WORKDIR /src
RUN --mount=type=bind,source=.,target=/src \
--mount=type=cache,target=/go/pkg/mod \
go mod download
RUN --mount=type=bind,source=.,target=/src \
--mount=type=cache,target=/go/pkg/mod \
--mount=type=cache,target=/root/.cache/go-build \
CGO_ENABLED=1 go build -o /out/statuspage ./server
FROM alpine:3.22
RUN apk add --no-cache ca-certificates tzdata
WORKDIR /app
COPY --from=backend /out/statuspage /app/statuspage
COPY --from=frontend /ui/dist /app/dist
VOLUME /app/data.volume
EXPOSE 5000
ENTRYPOINT ["/app/statuspage"]
CMD ["-c", "/app/config.local.yaml", "--addr", ":5000"]
LICENSE
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GNU AFFERO GENERAL PUBLIC LICENSE
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If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.
README.md
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# statuspage
A status page that monitors the machines in your lab (or home). It probes
machines over ICMP and TCP, runs a script over SSH to collect checks and
numeric metrics, and keeps recent history in SQLite.
The backend is a single Go binary, the frontend is a Preact + Vite page, and
everything is configured with one YAML file.
## Features
- ICMP + TCP probes per machine, combined into a single status (`up`,
`degraded`, `down`, `unknown`).
- Optional SSH check that runs a script and parses:
- check lines like `name:status:info` (e.g. `vulkan:on:AMD Radeon`);
- metric lines like `name:metric:value` (e.g. `cpu_pct:metric:42.5`) that get
accumulated into a SQLite time series;
- free-form text after a `---` separator (shown raw in the modal).
- Per-machine history (status ticks + incidents) and per-metric line plots with
hover tooltips.
- Interactive refresh button (opt-in) to re-probe a machine on demand.
- A neo-brutalist web UI with no runtime JS framework bloat (Preact + Vite).
## Layout
```
statuspage
├── server/ the Go backend
│ ├── main.go entrypoint, flags, routes
│ ├── config.go yaml config loading + defaults
│ ├── monitor.go probes, ssh runs, status/history/metrics handlers
│ └── history.go sqlite history + metrics storage and downsampling
├── go.mod module definition (statuspage)
├── src/ the frontend (Preact + TS + CSS)
├── example.config.yaml documented, fully commented-out example config
├── config.local.yaml local config (gitignored, contains ssh keys)
└── data.volume/ created at runtime, holds history.db
```
## Requirements
- Go (recent, 1.22+ for `http.ServeMux` patterns).
- A C compiler for `mattn/go-sqlite3` (the `CGO_ENABLED=1` build).
- `bun` (or `npm`) for the frontend build.
## Building
```sh
bun install
bun run build
CGO_ENABLED=1 go build -o bin/statuspage ./server
```
Run it:
```sh
./bin/statuspage -c config.local.yaml
```
Then open `http://localhost:5000`.
### Docker
```sh
cp config.local.yaml config.local.yaml # your config goes here
docker compose up -d --build
```
The container mounts `./data.volume` over `/app/data.volume` (the default
database location) and `./config.local.yaml` read-only at
`/app/config.local.yaml`. `NET_RAW` is added so ICMP probes work; without it
the app falls back to TCP-only.
### Development mode
The backend can skip serving the built frontend while you work on it with Vite:
```sh
./bin/statuspage -c config.local.yaml --dev-server # terminal 1
bun dev # terminal 2, http://localhost:5173
```
`vite.config.ts` proxies `/api` to `http://localhost:5000`, so the backend must
be running too.
### Flags
| flag | default | description |
| ------------------- | -------------- | -------------------------------------------------- |
| `-c, --config` | `config.local.yaml` | path to the yaml config file |
| `--addr` | `:5000` | listen address |
| `--db` | `data.volume/history.db` | sqlite database file |
| `--dev` | `false` | run `bun run build` before serving `dist/` |
| `--dev-server` | `false` | don't serve `dist/` (Vite dev server handles it) |
## Configuration
Everything lives in a single yaml file. A fully documented, commented-out
example with every option is in `example.config.yaml` — copy it to
`config.local.yaml` and fill it in. The top-level layout:
```yaml
title: "My machines"
interactive: true
shared_metric_window: false
ping: { ... }
ssh: { ... }
metrics:
cpu_pct: { min: 0, max: 100 }
groups:
- name: "Lab"
machines:
- host: a1.example.net
```
### `title`
```yaml
title: "Laboratori Dipartimento di Matematica"
```
Shown in the header and the browser tab. Defaults to `Status Page`.
### `interactive`
```yaml
interactive: true
```
Whether clients can trigger an on-demand probe via the refresh button on each
machine card. When `false`, the endpoint refuses refresh requests.
### `shared_metric_window`
```yaml
shared_metric_window: false
```
Controls how metric plots share their x (time) axis:
- `false` (default): each metric plot scales to its own recorded time span, so
a brand new metric isn't drowned out by an older one.
- `true`: all plots are aligned to the same window (the last ~24h) and are
downsampled together, so you can compare shapes directly.
### `ping`
```yaml
ping:
interval: 10s
timeout: 2s
tcp_port: 22
```
| key | default | description |
| ---------- | ------- | ----------------------------------------- |
| `interval` | `10s` | how often to probe |
| `timeout` | `2s` | per-probe timeout |
| `tcp_port` | `22` | port to TCP-connect for the tcp check |
Only IPv4 addresses are probed (IPv6 is ignored).
### `ssh`
```yaml
ssh:
interval: 5m
user: labuser
port: 22
key: |
-----BEGIN OPENSSH PRIVATE KEY-----
...
-----END OPENSSH PRIVATE KEY-----
script: |
echo "tmp:on:$(df -h /tmp 2>/dev/null | awk 'NR==2 {print $2}')"
echo "cpu_pct:metric:$(top -bn1 2>/dev/null | awk '/%Cpu/ {printf "%.1f", 100-$8}')"
echo "---"
echo "kernel: $(uname -sr)"
```
| key | default | description |
| ---------- | --------- | ---------------------------------------- |
| `interval` | `10m` | how often to run the script over ssh |
| `user` | `root` | ssh user |
| `port` | `22` | ssh port |
| `key` | — | PEM private key (the only supported auth)|
| `script` | — | shell script to run; see script format |
If `key` or `script` is empty, the ssh check is skipped for that machine.
#### Script format
One line per check, `name:status:info`:
```
vulkan:on:AMD Radeon RX 570
nvidia:off:no-nvidia-gpus
```
`status` can be `on`, `off`, `down`, or anything else (shown as `unknown`).
A line with `name:metric:value` is treated as a numeric metric, accumulated in
SQLite and drawn as a line plot:
```
cpu_pct:metric:42.5
ram_pct:metric:61.3
disk_free:metric:198.2GB
```
The value is parsed as a leading number with an optional unit suffix.
Everything after the first line containing `---` is treated as free-form output
and shown raw in the machine modal:
```
---
hostname: a1
kernel: Linux 6.8.0
uptime: up 3 days
```
#### `metrics`
Suggested `min`/`max` ranges for metric plots, keyed by metric name:
```yaml
metrics:
cpu_pct:
min: 0
max: 100
ram_pct:
min: 0
max: 100
disk_free:
min: 0
```
These are soft bounds: the plot scales to fit the data if a value goes outside
the range, and the current value is highlighted (with a wavy underline) when
out of range.
### `groups`
```yaml
groups:
- name: "Aula 3"
machines:
- host: a3-dott1.example.net
- name: "front door pi"
host: 192.168.1.10
```
A `machines` entry only needs `host`; `name` overrides the display name.
Machines listed at the top level (outside any group) go into a `Machines`
section instead.
Per-machine overrides for `ping` and `ssh` are supported, and inherit
unset values from the top level:
```yaml
groups:
- name: "Lab"
machines:
- host: special.example.net
ping:
interval: 30s
ssh:
interval: 1m
```
## HTTP API
| method | path | description |
| ------ | ------------------------ | -------------------------------------------- |
| `GET` | `/api/status` | current status, stats, metric ranges |
| `GET` | `/api/history/{machine}` | status tick history (`?limit=`, max 500) |
| `GET` | `/api/metrics/{machine}` | metric time series (see below) |
| `POST` | `/api/refresh/{machine}` | schedule an on-demand probe (interactive) |
`/api/metrics/{machine}` query params:
| param | description |
| ------------ | ------------------------------------------------ |
| `name` | restrict to one metric name |
| `min`, `max` | unix seconds window to fetch |
| `max_points` | max returned points (downsampled, default 100) |
| `shared` | align downsampling to the `min`/`max` window |
The frontend asks for the last ~24h at `max_points=100` per metric.
## Storage
A single SQLite file holds everything:
- `history` — status ticks per machine.
- `metrics` — accumulated metric samples per machine/name.
It's capped at 200k history rows (5000 per machine) and 5000 samples per
metric name, pruned every 10 minutes. The footer shows the database size and a
rough "size in a month" estimate.
## Notes
- The SSH host key check is disabled, since lab machines change frequently. Be
aware of the implications if you expose this outside a trusted network.
- SSH key authentication only; password auth is not supported.
- ICMP requires a raw socket or `CAP_NET_RAW`. When unavailable, the app falls
back to TCP-only probes.
- The frontend polls `/api/status` every 3 seconds.
- The database grows while the server runs; a prune loop keeps it bounded, but
it is not a production-grade time-series store.
## License
GNU Affero General Public License v3.0 (AGPL-3.0). See [LICENSE](LICENSE).
bun.lock
+275
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"lightningcss-win32-x64-msvc": ["lightningcss-win32-x64-msvc@1.33.0", "", { "os": "win32", "cpu": "x64" }, "sha512-OlEICDx/Xl0FqSp4bry8zFnCvGpig3Gl4gCquvYwHuqJKEC1+n9NgDniFvqHGmMv1ZkqDJrDqKKSykTDX+ehuA=="],
"lru-cache": ["lru-cache@5.1.1", "", { "dependencies": { "yallist": "^3.0.2" } }, "sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w=="],
"magic-string": ["magic-string@0.30.21", "", { "dependencies": { "@jridgewell/sourcemap-codec": "^1.5.5" } }, "sha512-vd2F4YUyEXKGcLHoq+TEyCjxueSeHnFxyyjNp80yg0XV4vUhnDer/lvvlqM/arB5bXQN5K2/3oinyCRyx8T2CQ=="],
"ms": ["ms@2.1.3", "", {}, "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA=="],
"nanoid": ["nanoid@3.3.16", "", { "bin": { "nanoid": "bin/nanoid.cjs" } }, "sha512-bzlKTyNJ7+LdGIIwy8ijFpIqEQIvafahV7eYykJ8Cvh42EdJeODoJ6gUJXpQJvej1BddH8OqTXZNE/KfbWAu8Q=="],
"node-html-parser": ["node-html-parser@6.1.13", "", { "dependencies": { "css-select": "^5.1.0", "he": "1.2.0" } }, "sha512-qIsTMOY4C/dAa5Q5vsobRpOOvPfC4pB61UVW2uSwZNUp0QU/jCekTal1vMmbO0DgdHeLUJpv/ARmDqErVxA3Sg=="],
"node-releases": ["node-releases@2.0.51", "", {}, "sha512-wRNIrw4DmVLKQlbgOMdkMx27Wrpzes2hh5Jtbi2bjPd+4wJstWIqP5A+lscnqbm0xxmT5Bpg8Lec5ItEBwx6BQ=="],
"nth-check": ["nth-check@2.1.1", "", { "dependencies": { "boolbase": "^1.0.0" } }, "sha512-lqjrjmaOoAnWfMmBPL+XNnynZh2+swxiX3WUE0s4yEHI6m+AwrK2UZOimIRl3X/4QctVqS8AiZjFqyOGrMXb/w=="],
"picocolors": ["picocolors@1.1.1", "", {}, "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA=="],
"picomatch": ["picomatch@4.0.5", "", {}, "sha512-RvwwcruNjI1ncT5xRakeyS9Lf8lcItv34KD+aif+VH9kduAyfYBipGh12274xtenIPZ119/R9BdTBa8gAwSh0A=="],
"postcss": ["postcss@8.5.25", "", { "dependencies": { "nanoid": "^3.3.16", "picocolors": "^1.1.1", "source-map-js": "^1.2.1" } }, "sha512-DTPx3RWSSnWyzLxQnlH0rJP+EW5ekl16ZU4/psbIhA0e53kJfdgaN5vKM+xP7yJtXVu+nfdVFmlgFDEKAe4Pyw=="],
"preact": ["preact@10.29.7", "", { "peerDependencies": { "preact-render-to-string": ">=5" }, "optionalPeers": ["preact-render-to-string"] }, "sha512-DCHYrK/B10yUD3ZjLfhZ3WIE/9Vf9VFUODcRE2dRomTYDpJk6z6L9wecSfhfE6M9ZTHUdyQkoC46arIDhEV84Q=="],
"rolldown": ["rolldown@1.2.1", "", { "dependencies": { "@oxc-project/types": "=0.142.0", "@rolldown/pluginutils": "^1.0.0" }, "optionalDependencies": { "@rolldown/binding-android-arm64": "1.2.1", "@rolldown/binding-darwin-arm64": "1.2.1", "@rolldown/binding-darwin-x64": "1.2.1", "@rolldown/binding-freebsd-x64": "1.2.1", "@rolldown/binding-linux-arm-gnueabihf": "1.2.1", "@rolldown/binding-linux-arm64-gnu": "1.2.1", "@rolldown/binding-linux-arm64-musl": "1.2.1", "@rolldown/binding-linux-ppc64-gnu": "1.2.1", "@rolldown/binding-linux-s390x-gnu": "1.2.1", "@rolldown/binding-linux-x64-gnu": "1.2.1", "@rolldown/binding-linux-x64-musl": "1.2.1", "@rolldown/binding-openharmony-arm64": "1.2.1", "@rolldown/binding-wasm32-wasi": "1.2.1", "@rolldown/binding-win32-arm64-msvc": "1.2.1", "@rolldown/binding-win32-x64-msvc": "1.2.1" }, "bin": { "rolldown": "./bin/cli.mjs" } }, "sha512-4FKJhg8d3OiyQOA6Q1Q0hoFFpW9/OoX+VsHzpECsdsIZoOArrAK90gl59YK/Z+gnDel45bgJZK03ozH/9bCqEw=="],
"semver": ["semver@6.3.1", "", { "bin": { "semver": "bin/semver.js" } }, "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA=="],
"simple-code-frame": ["simple-code-frame@1.3.0", "", { "dependencies": { "kolorist": "^1.6.0" } }, "sha512-MB4pQmETUBlNs62BBeRjIFGeuy/x6gGKh7+eRUemn1rCFhqo7K+4slPqsyizCbcbYLnaYqaoZ2FWsZ/jN06D8w=="],
"source-map": ["source-map@0.7.6", "", {}, "sha512-i5uvt8C3ikiWeNZSVZNWcfZPItFQOsYTUAOkcUPGd8DqDy1uOUikjt5dG+uRlwyvR108Fb9DOd4GvXfT0N2/uQ=="],
"source-map-js": ["source-map-js@1.2.1", "", {}, "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA=="],
"stack-trace": ["stack-trace@1.0.0", "", {}, "sha512-H6D7134xi6qONvh7ZHKgviXf+rd3vhGBSvebPZCaUkd8zvQ+7PtDw6CljPTe4cXWNf2IKZGNqw6VJXSb9IgBpA=="],
"tinyglobby": ["tinyglobby@0.2.17", "", { "dependencies": { "fdir": "^6.5.0", "picomatch": "^4.0.4" } }, "sha512-wXR/dYpcqKmfWpEdZjiKJOwCNFndD0DMnrW/cYjVGttEkBfVgcLFHoNrlj47mjOVic9yyNu65alsgF4NQyTa2g=="],
"tslib": ["tslib@2.8.1", "", {}, "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w=="],
"typescript": ["typescript@5.9.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw=="],
"undici-types": ["undici-types@8.3.0", "", {}, "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ=="],
"update-browserslist-db": ["update-browserslist-db@1.2.3", "", { "dependencies": { "escalade": "^3.2.0", "picocolors": "^1.1.1" }, "peerDependencies": { "browserslist": ">= 4.21.0" }, "bin": { "update-browserslist-db": "cli.js" } }, "sha512-Js0m9cx+qOgDxo0eMiFGEueWztz+d4+M3rGlmKPT+T4IS/jP4ylw3Nwpu6cpTTP8R1MAC1kF4VbdLt3ARf209w=="],
"vite": ["vite@8.2.0", "", { "dependencies": { "lightningcss": "^1.33.0", "picomatch": "^4.0.5", "postcss": "^8.5.23", "rolldown": "~1.2.0", "tinyglobby": "^0.2.17" }, "optionalDependencies": { "fsevents": "~2.3.3" }, "peerDependencies": { "@types/node": "^20.19.0 || >=22.12.0", "@vitejs/devtools": "^0.4.0", "esbuild": "^0.27.0 || ^0.28.0", "jiti": ">=1.21.0", "less": "^4.0.0", "sass": "^1.70.0", "sass-embedded": "^1.70.0", "stylus": ">=0.54.8", "sugarss": "^5.0.0", "terser": "^5.16.0", "tsx": "^4.8.1", "yaml": "^2.4.2" }, "optionalPeers": ["@types/node", "@vitejs/devtools", "esbuild", "jiti", "less", "sass", "sass-embedded", "stylus", "sugarss", "terser", "tsx", "yaml"], "bin": { "vite": "bin/vite.js" } }, "sha512-pn+CFpM0lwDeKwmOq1ZaBK/9sjorZcgqxki6MbY/jPEVd9vichIlmlD4HmQ5wdP5EgqQCFRaACBxMC7uEGc6lQ=="],
"vite-prerender-plugin": ["vite-prerender-plugin@0.5.13", "", { "dependencies": { "kolorist": "^1.8.0", "magic-string": "0.x >= 0.26.0", "node-html-parser": "^6.1.12", "simple-code-frame": "^1.3.0", "source-map": "^0.7.4", "stack-trace": "^1.0.0-pre2" }, "peerDependencies": { "vite": "5.x || 6.x || 7.x || 8.x" } }, "sha512-IKSpYkzDBsKAxa05naRbj7GvNVMSdww/Z/E89oO3xndz+gWnOBOKOAbEXv7qDhktY/j3vHgJmoV1pPzqU2tx9g=="],
"yallist": ["yallist@3.1.1", "", {}, "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="],
"zimmerframe": ["zimmerframe@1.1.4", "", {}, "sha512-B58NGBEoc8Y9MWWCQGl/gq9xBCe4IiKM0a2x7GZdQKOW5Exr8S1W24J6OgM1njK8xCRGvAJIL/MxXHf6SkmQKQ=="],
"@prefresh/vite/@rollup/pluginutils": ["@rollup/pluginutils@4.2.1", "", { "dependencies": { "estree-walker": "^2.0.1", "picomatch": "^2.2.2" } }, "sha512-iKnFXr7NkdZAIHiIWE+BX5ULi/ucVFYWD6TbAV+rZctiRTY2PL6tsIKhoIOaoskiWAkgu+VsbXgUVDNLHf+InQ=="],
"@prefresh/vite/@rollup/pluginutils/picomatch": ["picomatch@2.3.2", "", {}, "sha512-V7+vQEJ06Z+c5tSye8S+nHUfI51xoXIXjHQ99cQtKUkQqqO1kO/KCJUfZXuB47h/YBlDhah2H3hdUGXn8ie0oA=="],
}
}
docker-compose.yml
+12
View File
@@ -0,0 +1,12 @@
services:
statuspage:
build: .
container_name: statuspage
ports:
- "5000:5000"
volumes:
- ./data.volume:/app/data.volume
- ./config.local.yaml:/app/config.local.yaml:ro
cap_add:
- NET_RAW
restart: unless-stopped
example.config.yaml
+84
View File
@@ -0,0 +1,84 @@
# statuspage example configuration
#
# Everything in this file is commented out on purpose. Uncomment (and adjust)
# the bits you need. See the README for the full reference.
#
# Save a copy as config.local.yaml and start the server with:
#
# ./bin/statuspage -c config.local.yaml
#
# or point Docker at it (see docker-compose.yml).
# title: "My machines" # shown in the header and browser tab
# # default: "Status Page"
# interactive: true # allow on-demand probes via the refresh
# # button on each machine card
# # default: false
# shared_metric_window: false # align all metric plot x-axes to the same
# # window (the last ~24h) so shapes can be
# # compared directly
# # default: false
# ---------- global ping defaults ----------
# ping:
# interval: 10s # how often to probe default: 10s
# timeout: 2s # per-probe timeout default: 2s
# tcp_port: 22 # port to TCP-connect to default: 22
# # (only IPv4 hosts are probed)
# ---------- global ssh defaults ----------
# ssh:
# interval: 10m # how often to run the script default: 10m
# user: root # ssh user default: root
# port: 22 # ssh port default: 22
# key: | # PEM private key (the only supported auth)
# -----BEGIN OPENSSH PRIVATE KEY-----
# ...
# -----END OPENSSH PRIVATE KEY-----
# script: | # shell script to run over ssh
# echo "tmp:on:$(df -h /tmp 2>/dev/null | awk 'NR==2 {print $2}')"
# echo "cpu_pct:metric:$(top -bn1 2>/dev/null | awk '/%Cpu/ {printf "%.1f", 100-$8}')"
# echo "---"
# echo "kernel: $(uname -sr)"
#
# Script format, one line per item:
# name:status:info -> a check chip (status: on / off / down / anything)
# name:metric:value -> a numeric metric, accumulated into the history db
# --- -> everything after the first such line is shown raw
#
# If key or script is empty, the ssh check is skipped for that machine.
# ---------- suggested y-axis bounds for metric plots ----------
# metrics:
# cpu_pct:
# min: 0 # soft bounds: the plot only extends the
# max: 100 # axis if the data goes outside
# ram_pct:
# min: 0
# max: 100
# disk_free:
# min: 0
# ---------- machines grouped by section ----------
# groups:
# - name: Aula 3
# machines:
# - host: a3-dott1.example.net
# - host: a3-dott2.example.net
# name: dottorandi 2 # optional display name (defaults to host)
# ping: # per-machine overrides, inherit the rest
# interval: 30s
# tcp_port: 22
# ssh:
# interval: 1m
# user: root
# ---------- machines without a group (shown under "Machines") ----------
# machines:
# - host: router.example.net
# name: router
# ping:
# interval: 5s
# tcp_port: 80
go.mod
+15
View File
@@ -0,0 +1,15 @@
module statuspage
go 1.26.4
require (
golang.org/x/crypto v0.54.0
golang.org/x/net v0.57.0
gopkg.in/yaml.v3 v3.0.1
)
require (
github.com/mattn/go-sqlite3 v1.14.49 // indirect
github.com/spf13/pflag v1.0.10 // indirect
golang.org/x/sys v0.47.0 // indirect
)
go.sum
+16
View File
@@ -0,0 +1,16 @@
github.com/mattn/go-sqlite3 v1.14.49 h1:B8jBHC3xhxZgxztrgruTuLucebnULQnx4W7cF7SAE9w=
github.com/mattn/go-sqlite3 v1.14.49/go.mod h1:6JTjA44L93a0QCyJef5YvlPoKXntQPjzWv5gtm9sB6w=
github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
golang.org/x/crypto v0.54.0 h1:YLIA59K4fiNzHzjnZt2tUJQjQtUWfWbeHBqKtk3eScw=
golang.org/x/crypto v0.54.0/go.mod h1:KWL8ny2AZdGR2cWmzeHrp2azQPGogOv+HeQaVEXC2dk=
golang.org/x/net v0.57.0 h1:K5+3DljvIuDG9/Jv9rvyMywYNFCQ9RSUY6OOTTkT+tE=
golang.org/x/net v0.57.0/go.mod h1:KpXc8iv+r3XplLAG/f7Jsf9RPszJzdR0f58q9vGOuEU=
golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
golang.org/x/term v0.45.0 h1:NwWyBmoJCbfTHpxrWoZ9C6/VxOf7ic219I8xZZFdrf0=
golang.org/x/term v0.45.0/go.mod h1:9aqxs0blBcrm/n0L9QW0aRVD+ktan8ssZromtqJC43w=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
index.html
+13
View File
@@ -0,0 +1,13 @@
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Status Page</title>
<script src="https://cdn.jsdelivr.net/npm/iconify-icon@1.0.8/dist/iconify-icon.min.js"></script>
</head>
<body>
<div id="app"></div>
<script type="module" src="/src/main.tsx"></script>
</body>
</html>
package.json
+23
View File
@@ -0,0 +1,23 @@
{
"name": "statuspage",
"type": "module",
"private": true,
"scripts": {
"dev": "vite",
"build": "vite build",
"preview": "vite preview"
},
"devDependencies": {
"@preact/preset-vite": "^2.10.6",
"@types/bun": "latest",
"vite": "^8.2.0"
},
"peerDependencies": {
"typescript": "^5"
},
"dependencies": {
"@fontsource/inria-sans": "^5.3.0",
"@fontsource/iosevka-etoile": "^5.3.0",
"preact": "^10.29.7"
}
}
server/config.go
+197
View File
@@ -0,0 +1,197 @@
package main
import (
"fmt"
"os"
"time"
"gopkg.in/yaml.v3"
)
type Duration struct {
time.Duration
}
func (d *Duration) UnmarshalYAML(node *yaml.Node) error {
var s string
if err := node.Decode(&s); err != nil {
return err
}
dur, err := time.ParseDuration(s)
if err != nil {
return fmt.Errorf("invalid duration %q: %w", s, err)
}
d.Duration = dur
return nil
}
type PingConfig struct {
Interval Duration `yaml:"interval"`
Timeout Duration `yaml:"timeout"`
TCPPort int `yaml:"tcp_port"`
}
type SSHConfig struct {
Interval Duration `yaml:"interval"`
User string `yaml:"user"`
Port int `yaml:"port"`
Key string `yaml:"key"`
Script string `yaml:"script"`
}
type MachineConfig struct {
Name string `yaml:"name"`
Host string `yaml:"host"`
Ping *PingConfig `yaml:"ping"`
SSH *SSHConfig `yaml:"ssh"`
}
type GroupConfig struct {
Name string `yaml:"name"`
Machines []MachineConfig `yaml:"machines"`
}
type MetricRange struct {
Min *float64 `yaml:"min"`
Max *float64 `yaml:"max"`
}
type RawConfig struct {
Title string `yaml:"title"`
Interactive bool `yaml:"interactive"`
SharedMetricWindow bool `yaml:"shared_metric_window"`
Ping *PingConfig `yaml:"ping"`
SSH *SSHConfig `yaml:"ssh"`
Metrics map[string]MetricRange `yaml:"metrics"`
Groups []GroupConfig `yaml:"groups"`
Machines []MachineConfig `yaml:"machines"`
}
type Machine struct {
ID string
Name string
Host string
Group string
Ping PingConfig
SSH SSHConfig
}
type Config struct {
Title string
Interactive bool
SharedMetricWindow bool
Ping PingConfig
SSH SSHConfig
Metrics map[string]MetricRange
Groups []GroupConfig
Machines []Machine
}
func LoadConfig(path string) (*Config, error) {
data, err := os.ReadFile(path)
if err != nil {
return nil, err
}
var raw RawConfig
if err := yaml.Unmarshal(data, &raw); err != nil {
return nil, fmt.Errorf("parsing %s: %w", path, err)
}
cfg := &Config{
Title: raw.Title,
Interactive: raw.Interactive,
SharedMetricWindow: raw.SharedMetricWindow,
Ping: PingConfig{
Interval: Duration{time.Second * 10},
Timeout: Duration{time.Second * 2},
TCPPort: 22,
},
SSH: SSHConfig{
Interval: Duration{time.Minute * 10},
User: "root",
Port: 22,
},
}
if raw.Ping != nil {
if raw.Ping.Interval.Duration > 0 {
cfg.Ping.Interval = raw.Ping.Interval
}
if raw.Ping.Timeout.Duration > 0 {
cfg.Ping.Timeout = raw.Ping.Timeout
}
if raw.Ping.TCPPort != 0 {
cfg.Ping.TCPPort = raw.Ping.TCPPort
}
}
if raw.SSH != nil {
if raw.SSH.Interval.Duration > 0 {
cfg.SSH.Interval = raw.SSH.Interval
}
if raw.SSH.User != "" {
cfg.SSH.User = raw.SSH.User
}
if raw.SSH.Port != 0 {
cfg.SSH.Port = raw.SSH.Port
}
cfg.SSH.Key = raw.SSH.Key
cfg.SSH.Script = raw.SSH.Script
}
if cfg.Title == "" {
cfg.Title = "Status Page"
}
cfg.Groups = raw.Groups
cfg.Metrics = raw.Metrics
for _, g := range raw.Groups {
for _, mc := range g.Machines {
cfg.Machines = append(cfg.Machines, resolveMachine(mc, g.Name, cfg))
}
}
for _, mc := range raw.Machines {
cfg.Machines = append(cfg.Machines, resolveMachine(mc, "", cfg))
}
return cfg, nil
}
func resolveMachine(mc MachineConfig, group string, cfg *Config) Machine {
m := Machine{
ID: mc.Host,
Name: mc.Host,
Host: mc.Host,
Group: group,
Ping: cfg.Ping,
SSH: cfg.SSH,
}
if mc.Name != "" {
m.Name = mc.Name
}
if mc.Ping != nil {
if mc.Ping.Interval.Duration > 0 {
m.Ping.Interval = mc.Ping.Interval
}
if mc.Ping.Timeout.Duration > 0 {
m.Ping.Timeout = mc.Ping.Timeout
}
if mc.Ping.TCPPort != 0 {
m.Ping.TCPPort = mc.Ping.TCPPort
}
}
if mc.SSH != nil {
if mc.SSH.Interval.Duration > 0 {
m.SSH.Interval = mc.SSH.Interval
}
if mc.SSH.User != "" {
m.SSH.User = mc.SSH.User
}
if mc.SSH.Port != 0 {
m.SSH.Port = mc.SSH.Port
}
if mc.SSH.Key != "" {
m.SSH.Key = mc.SSH.Key
}
if mc.SSH.Script != "" {
m.SSH.Script = mc.SSH.Script
}
}
return m
}
server/history.go
+402
View File
@@ -0,0 +1,402 @@
package main
import (
"context"
"database/sql"
"log"
"os"
"sort"
"time"
_ "github.com/mattn/go-sqlite3"
)
const historyPerMachine = 5000
const historyTotalCap = 200000
const metricsPerName = 5000
const historyPruneInterval = 10 * time.Minute
type HistoryEntry struct {
TS int64 `json:"ts"`
Status string `json:"status"`
IP string `json:"ip"`
}
type MetricEntry struct {
TS int64 `json:"ts"`
Name string `json:"name"`
Value float64 `json:"value"`
Unit string `json:"unit"`
}
type History struct {
db *sql.DB
path string
}
func NewHistory(path string) (*History, error) {
dsn := "file:" + path +
"?_journal_mode=WAL" +
"&_synchronous=NORMAL" +
"&_busy_timeout=5000" +
"&_foreign_keys=on" +
"&_txlock=immediate"
db, err := sql.Open("sqlite3", dsn)
if err != nil {
return nil, err
}
db.SetMaxOpenConns(1)
const schema = `
CREATE TABLE IF NOT EXISTS history (
id INTEGER PRIMARY KEY AUTOINCREMENT,
machine TEXT NOT NULL,
ts INTEGER NOT NULL,
status TEXT NOT NULL,
ip TEXT NOT NULL DEFAULT ''
);
CREATE INDEX IF NOT EXISTS idx_history_machine_ts ON history(machine, ts);
CREATE TABLE IF NOT EXISTS metrics (
id INTEGER PRIMARY KEY AUTOINCREMENT,
machine TEXT NOT NULL,
name TEXT NOT NULL,
ts INTEGER NOT NULL,
value REAL NOT NULL,
unit TEXT NOT NULL DEFAULT ''
);
CREATE INDEX IF NOT EXISTS idx_metrics_machine_name_ts ON metrics(machine, name, ts);`
if _, err := db.Exec(schema); err != nil {
db.Close()
return nil, err
}
return &History{db: db, path: path}, nil
}
func (h *History) Close() error {
return h.db.Close()
}
func (h *History) Size() int64 {
if fi, err := os.Stat(h.path); err == nil {
return fi.Size()
}
return 0
}
func (h *History) Stats() (rows int, firstTS int64) {
h.db.QueryRow(`SELECT COUNT(*), COALESCE(MIN(ts), 0) FROM history`).Scan(&rows, &firstTS)
return
}
func (h *History) Record(machine, status, ip string) {
_, err := h.db.Exec(
`INSERT INTO history (machine, ts, status, ip) VALUES (?, ?, ?, ?)`,
machine, time.Now().Unix(), status, ip,
)
if err != nil {
log.Printf("history insert (%s): %v", machine, err)
}
}
func (h *History) RecordMetric(machine, name string, ts int64, value float64, unit string) {
_, err := h.db.Exec(
`INSERT INTO metrics (machine, name, ts, value, unit) VALUES (?, ?, ?, ?, ?)`,
machine, name, ts, value, unit,
)
if err != nil {
log.Printf("metric insert (%s/%s): %v", machine, name, err)
}
}
func (h *History) Query(machine string, limit int) ([]HistoryEntry, error) {
if limit <= 0 || limit > historyPerMachine {
limit = historyPerMachine
}
rows, err := h.db.Query(
`SELECT ts, status, ip FROM history WHERE machine = ? ORDER BY id DESC LIMIT ?`,
machine, limit,
)
if err != nil {
return nil, err
}
defer rows.Close()
entries := []HistoryEntry{}
for rows.Next() {
var e HistoryEntry
if err := rows.Scan(&e.TS, &e.Status, &e.IP); err != nil {
return nil, err
}
entries = append(entries, e)
}
return entries, rows.Err()
}
func (h *History) QueryMetrics(machine, name string, minTS, maxTS int64, maxPoints int, shared bool) ([]MetricEntry, error) {
if maxPoints <= 0 || maxPoints > metricsPerName*5 {
maxPoints = 100
}
q := `SELECT ts, name, value, unit FROM metrics WHERE machine = ?`
args := []any{machine}
if name != "" {
q += ` AND name = ?`
args = append(args, name)
}
if minTS > 0 {
q += ` AND ts >= ?`
args = append(args, minTS)
}
if maxTS > 0 {
q += ` AND ts < ?`
args = append(args, maxTS)
}
q += ` ORDER BY id ASC LIMIT ?`
args = append(args, metricsPerName*5)
rows, err := h.db.Query(q, args...)
if err != nil {
return nil, err
}
defer rows.Close()
entries := []MetricEntry{}
for rows.Next() {
var e MetricEntry
if err := rows.Scan(&e.TS, &e.Name, &e.Value, &e.Unit); err != nil {
return nil, err
}
entries = append(entries, e)
}
if err := rows.Err(); err != nil {
return nil, err
}
var lo, hi int64
if shared {
lo = minTS
hi = maxTS
}
return downsampleMetrics(entries, lo, hi, maxPoints), nil
}
func downsampleMetrics(entries []MetricEntry, lo, hi int64, maxPoints int) []MetricEntry {
if maxPoints < 1 {
return entries
}
groups := map[string][]MetricEntry{}
order := []string{}
for _, e := range entries {
if _, ok := groups[e.Name]; !ok {
order = append(order, e.Name)
}
groups[e.Name] = append(groups[e.Name], e)
}
out := []MetricEntry{}
for _, name := range order {
out = append(out, downsampleGroup(groups[name], lo, hi, maxPoints)...)
}
sort.Slice(out, func(i, j int) bool { return out[i].TS < out[j].TS })
return out
}
func downsampleGroup(g []MetricEntry, lo, hi int64, maxPoints int) []MetricEntry {
if len(g) <= maxPoints {
return g
}
return alignGroup(g, lo, hi, maxPoints)
}
// alignGroup downsamples g to at most maxPoints buckets whose boundaries are
// aligned to the [lo, hi] window, so all machines share the same bucket centers.
func alignGroup(g []MetricEntry, lo, hi int64, maxPoints int) []MetricEntry {
if len(g) == 0 {
return nil
}
if lo <= 0 {
lo = g[0].TS
}
if hi <= 0 {
hi = g[len(g)-1].TS
}
span := hi - lo
if span <= 0 {
span = 1
}
bucketSize := float64(span) / float64(maxPoints)
buckets := make([][]MetricEntry, maxPoints)
for _, e := range g {
idx := int(float64(e.TS-lo) / bucketSize)
if idx >= maxPoints {
idx = maxPoints - 1
}
if idx < 0 {
idx = 0
}
buckets[idx] = append(buckets[idx], e)
}
res := make([]MetricEntry, 0, maxPoints)
for i, b := range buckets {
if len(b) == 0 {
continue
}
var sum float64
for _, e := range b {
sum += e.Value
}
last := b[len(b)-1]
res = append(res, MetricEntry{
TS: lo + int64((float64(i)+0.5)*bucketSize),
Name: last.Name,
Value: sum / float64(len(b)),
Unit: last.Unit,
})
}
return res
}
func (h *History) QueryMetricsAll(minTS, maxTS int64) ([]MetricAggregate, [2]int64, error) {
q := `SELECT machine, ts, name, value, unit FROM metrics`
args := []any{}
if minTS > 0 {
q += ` WHERE ts >= ?`
args = append(args, minTS)
}
if maxTS > 0 {
if len(args) > 0 {
q += ` AND ts < ?`
} else {
q += ` WHERE ts < ?`
}
args = append(args, maxTS)
}
q += ` ORDER BY machine, name, id ASC LIMIT ?`
args = append(args, metricsPerName*10)
rows, err := h.db.Query(q, args...)
if err != nil {
return nil, [2]int64{}, err
}
defer rows.Close()
type rawEntry struct {
machine string
entry MetricEntry
}
raw := []rawEntry{}
var firstTS, lastTS int64
for rows.Next() {
var e rawEntry
if err := rows.Scan(&e.machine, &e.entry.TS, &e.entry.Name, &e.entry.Value, &e.entry.Unit); err != nil {
return nil, [2]int64{}, err
}
if firstTS == 0 || e.entry.TS < firstTS {
firstTS = e.entry.TS
}
if e.entry.TS > lastTS {
lastTS = e.entry.TS
}
raw = append(raw, e)
}
if err := rows.Err(); err != nil {
return nil, [2]int64{}, err
}
if minTS > 0 && firstTS < minTS {
firstTS = minTS
}
if maxTS > 0 && lastTS > maxTS {
lastTS = maxTS
}
type nameGroup struct {
unit string
series []MetricSeries
}
byName := map[string]*nameGroup{}
order := []string{}
for _, r := range raw {
ng, ok := byName[r.entry.Name]
if !ok {
ng = &nameGroup{unit: r.entry.Unit}
byName[r.entry.Name] = ng
order = append(order, r.entry.Name)
}
found := false
for i := range ng.series {
if ng.series[i].Machine == r.machine {
ng.series[i].Samples = append(ng.series[i].Samples, r.entry)
found = true
break
}
}
if !found {
ng.series = append(ng.series, MetricSeries{Machine: r.machine, Samples: []MetricEntry{r.entry}})
}
}
out := make([]MetricAggregate, 0, len(order))
for _, name := range order {
ng := byName[name]
agg := MetricAggregate{Name: name, Unit: ng.unit, Series: make([]MetricSeries, 0, len(ng.series))}
for _, s := range ng.series {
sort.Slice(s.Samples, func(i, j int) bool { return s.Samples[i].TS < s.Samples[j].TS })
agg.Series = append(agg.Series, s)
}
out = append(out, agg)
}
return out, [2]int64{firstTS, lastTS}, nil
}
type MetricSeries struct {
Machine string `json:"machine"`
Samples []MetricEntry `json:"samples"`
}
type MetricAggregate struct {
Name string `json:"name"`
Unit string `json:"unit"`
Series []MetricSeries `json:"series"`
}
func (h *History) prune() {
res, err := h.db.Exec(
`DELETE FROM history WHERE id NOT IN (SELECT id FROM history ORDER BY id DESC LIMIT ?)`,
historyTotalCap,
)
if err != nil {
log.Printf("history prune: %v", err)
} else {
n, _ := res.RowsAffected()
if n > 0 {
log.Printf("history pruned %d rows (kept last %d)", n, historyTotalCap)
}
}
res, err = h.db.Exec(`
DELETE FROM metrics WHERE id NOT IN (
SELECT id FROM (
SELECT id,
ROW_NUMBER() OVER (PARTITION BY machine, name ORDER BY id DESC) AS rn
FROM metrics
) WHERE rn <= ?
)`, metricsPerName)
if err != nil {
log.Printf("metrics prune: %v", err)
return
}
n, _ := res.RowsAffected()
if n > 0 {
log.Printf("metrics pruned %d rows (kept last %d per name)", n, metricsPerName)
}
}
func (h *History) pruneLoop(ctx context.Context) {
ticker := time.NewTicker(historyPruneInterval)
defer ticker.Stop()
h.prune()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
h.prune()
}
}
}
server/main.go
+98
View File
@@ -0,0 +1,98 @@
package main
import (
"context"
"log"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/spf13/pflag"
)
func buildFrontend() error {
cmd := "npm"
if _, err := exec.LookPath("npm"); err != nil {
cmd = "bun"
}
c := exec.Command(cmd, "run", "build")
c.Stdout = os.Stdout
c.Stderr = os.Stderr
log.Printf("running %s run build", cmd)
return c.Run()
}
func spaHandler() http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if strings.HasPrefix(r.URL.Path, "/api/") {
http.NotFound(w, r)
return
}
rel := filepath.Clean(strings.TrimPrefix(r.URL.Path, "/"))
if rel != "." && rel != "" {
p := filepath.Join("dist", rel)
if fi, err := os.Stat(p); err == nil && !fi.IsDir() {
http.ServeFile(w, r, p)
return
}
}
http.ServeFile(w, r, filepath.Join("dist", "index.html"))
}
}
func main() {
dev := pflag.Bool("dev", false, "run `npm run build` before serving dist/")
devServer := pflag.Bool("dev-server", false, "frontend served by the vite dev server, do not serve dist/")
addr := pflag.String("addr", ":5000", "listen address")
configPath := pflag.StringP("config", "c", "config.local.yaml", "yaml config file")
dbPath := pflag.String("db", "data.volume/history.db", "sqlite history database file")
pflag.Parse()
if dir := filepath.Dir(*dbPath); dir != "." {
if err := os.MkdirAll(dir, 0o755); err != nil {
log.Fatalf("creating db dir: %v", err)
}
}
if *dev {
if err := buildFrontend(); err != nil {
log.Fatalf("build failed: %v", err)
}
}
cfg, err := LoadConfig(*configPath)
if err != nil {
log.Fatalf("loading config: %v", err)
}
log.Printf("loaded %d machines from %s", len(cfg.Machines), *configPath)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
history, err := NewHistory(*dbPath)
if err != nil {
log.Fatalf("opening history db: %v", err)
}
defer history.Close()
go history.pruneLoop(ctx)
mon := NewMonitor(cfg, history)
mon.Start(ctx)
mux := http.NewServeMux()
mux.HandleFunc("GET /api/status", mon.statusHandler)
mux.HandleFunc("GET /api/history/{machine}", mon.historyHandler)
mux.HandleFunc("GET /api/metrics/aggregate", mon.metricsAggregateHandler)
mux.HandleFunc("GET /api/metrics/{machine}", mon.metricsHandler)
mux.HandleFunc("POST /api/refresh/{machine}", mon.refreshHandler)
if !*devServer {
mux.HandleFunc("GET /", spaHandler())
}
log.Printf("listening on %s", *addr)
if err := http.ListenAndServe(*addr, mux); err != nil {
log.Fatal(err)
}
}
server/monitor.go
+771
View File
@@ -0,0 +1,771 @@
package main
import (
"context"
"encoding/json"
"errors"
"fmt"
"log"
"math/rand/v2"
"net"
"net/http"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"golang.org/x/crypto/ssh"
"golang.org/x/net/icmp"
"golang.org/x/net/ipv4"
)
const statusUp = "up"
const statusDegraded = "degraded"
const statusDown = "down"
const statusUnknown = "unknown"
const checkOK = "ok"
const checkFail = "fail"
const checkNA = "na"
const maxIPHistory = 10
type sshResultState struct {
Ok bool `json:"ok"`
Result string `json:"result"`
ExitCode *int `json:"exitCode"`
LastRun time.Time `json:"lastRun"`
Error string `json:"error"`
}
type metricState struct {
value float64
unit string
updated time.Time
}
type machineState struct {
mu sync.RWMutex
status string
icmp string
tcp string
lastPing time.Time
ip string
ips []string
sshResult *sshResultState
metrics map[string]metricState
}
type metricStatus struct {
Name string `json:"name"`
Value float64 `json:"value"`
Unit string `json:"unit"`
Updated *time.Time `json:"updated"`
}
type machineStatus struct {
ID string `json:"id"`
Name string `json:"name"`
Host string `json:"host"`
IP string `json:"ip"`
IPs []string `json:"ips"`
Status string `json:"status"`
ICMP string `json:"icmp"`
TCP string `json:"tcp"`
LastPing *time.Time `json:"lastPing"`
SSHConfigured bool `json:"sshConfigured"`
SSH *sshResultState `json:"ssh"`
Metrics []metricStatus `json:"metrics"`
}
type groupStatus struct {
Name string `json:"name"`
Machines []machineStatus `json:"machines"`
}
type statsPayload struct {
PingInterval string `json:"pingInterval"`
PingTimeout string `json:"pingTimeout"`
TCPPort int `json:"tcpPort"`
SSHInterval string `json:"sshInterval"`
SSHEnabled bool `json:"sshEnabled"`
DBSize int64 `json:"dbSize"`
DBRows int `json:"dbRows"`
DBSizeMonth int64 `json:"dbSizeMonth"`
}
type metricRange struct {
Min *float64 `json:"min,omitempty"`
Max *float64 `json:"max,omitempty"`
}
type statusPayload struct {
Title string `json:"title"`
Interactive bool `json:"interactive"`
SharedMetricWindow bool `json:"sharedMetricWindow"`
Stats statsPayload `json:"stats"`
MetricRanges map[string]metricRange `json:"metricRanges"`
Groups []groupStatus `json:"groups"`
Machines []machineStatus `json:"machines"`
}
type Monitor struct {
cfg *Config
machines []Machine
machinesByID map[string]Machine
interactive bool
ctx context.Context
history *History
icmpMu sync.Mutex
icmp *icmp.PacketConn
icmpSeq atomic.Uint32
icmpID int
statesMu sync.RWMutex
states map[string]*machineState
}
func NewMonitor(cfg *Config, history *History) *Monitor {
m := &Monitor{
cfg: cfg,
machines: cfg.Machines,
machinesByID: make(map[string]Machine, len(cfg.Machines)),
interactive: cfg.Interactive,
ctx: context.Background(),
history: history,
states: make(map[string]*machineState, len(cfg.Machines)),
}
for _, mc := range cfg.Machines {
m.states[mc.ID] = &machineState{status: statusUnknown, icmp: checkNA, tcp: checkNA}
m.machinesByID[mc.ID] = mc
}
conn, err := icmp.ListenPacket("udp4", "0.0.0.0")
if err != nil {
conn, err = icmp.ListenPacket("ip4:icmp", "0.0.0.0")
}
if err != nil {
log.Printf("icmp unavailable (%v); falling back to TCP-only probes", err)
m.icmp = nil
} else {
m.icmp = conn
if la, ok := conn.LocalAddr().(*net.UDPAddr); ok {
m.icmpID = la.Port
}
log.Printf("icmp ok, will use it with tcp fallback")
}
return m
}
func (m *Monitor) Start(ctx context.Context) {
m.ctx = ctx
for _, mc := range m.machines {
go m.pingLoop(ctx, mc)
go m.sshLoop(ctx, mc)
}
}
func (m *Monitor) Refresh(mc Machine) {
go m.probe(m.ctx, mc)
go m.runSSH(m.ctx, mc)
}
func (m *Monitor) pingLoop(ctx context.Context, mc Machine) {
run := func() {
m.probe(ctx, mc)
}
run()
ticker := time.NewTicker(mc.Ping.Interval.Duration)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
run()
}
}
}
func (m *Monitor) state(mc Machine) *machineState {
m.statesMu.RLock()
s := m.states[mc.ID]
m.statesMu.RUnlock()
return s
}
func (m *Monitor) probe(ctx context.Context, mc Machine) {
st := m.state(mc)
if st == nil {
return
}
timeout := mc.Ping.Timeout.Duration
if timeout <= 0 {
timeout = 2 * time.Second
}
resolveCtx, cancel := context.WithTimeout(ctx, timeout)
ips, err := net.DefaultResolver.LookupHost(resolveCtx, mc.Host)
cancel()
if err != nil {
m.setProbeResult(st, statusDown, checkFail, checkFail, "", nil)
m.recordHistory(mc.ID, statusDown, "")
log.Printf("ping %s -> %s (resolve failed: %v)", mc.Host, statusDown, err)
return
}
// only ping over ipv4, ignore ipv6 addresses
var v4 []string
for _, a := range ips {
if net.ParseIP(a).To4() != nil {
v4 = append(v4, a)
}
}
if len(v4) == 0 {
m.setProbeResult(st, statusDown, checkFail, checkFail, "", nil)
m.recordHistory(mc.ID, statusDown, "")
log.Printf("ping %s -> %s (no ipv4 addresses)", mc.Host, statusDown)
return
}
ip := v4[0]
m.recordIP(st, v4)
icmpOK := m.icmpPing(net.ParseIP(ip), timeout)
tcpOK := m.tcpPing(net.ParseIP(ip), mc.Ping.TCPPort, timeout)
icmp := checkNA
if m.icmp != nil {
if icmpOK {
icmp = checkOK
} else {
icmp = checkFail
}
}
tcp := checkNA
if tcpOK {
tcp = checkOK
} else {
tcp = checkFail
}
status := statusDown
if icmpOK || tcpOK {
status = statusUp
st.mu.RLock()
sshBad := st.sshResult != nil && !st.sshResult.Ok
st.mu.RUnlock()
if (icmp == checkOK && tcp == checkFail) ||
(icmp == checkFail && tcp == checkOK) || sshBad {
status = statusDegraded
}
}
now := time.Now()
m.setProbeResult(st, status, icmp, tcp, ip, &now)
m.recordHistory(mc.ID, status, ip)
log.Printf("ping %s (%s) icmp=%s tcp=%s -> %s", mc.Host, ip, icmp, tcp, status)
}
func (m *Monitor) recordHistory(machine, status, ip string) {
if m.history != nil {
m.history.Record(machine, status, ip)
}
}
func (m *Monitor) setProbeResult(st *machineState, status, icmp, tcp, ip string, last *time.Time) {
st.mu.Lock()
defer st.mu.Unlock()
st.status = status
st.icmp = icmp
st.tcp = tcp
if ip != "" {
st.ip = ip
}
if last != nil {
st.lastPing = *last
}
}
func (m *Monitor) recordIP(st *machineState, ips []string) {
st.mu.Lock()
defer st.mu.Unlock()
for _, ip := range ips {
if ip == st.ip {
continue
}
st.ips = append(st.ips, ip)
}
if len(st.ips) > maxIPHistory {
st.ips = st.ips[len(st.ips)-maxIPHistory:]
}
}
func (m *Monitor) icmpPing(ip net.IP, timeout time.Duration) bool {
if m.icmp == nil || ip == nil {
return false
}
m.icmpMu.Lock()
defer m.icmpMu.Unlock()
seq := int(m.icmpSeq.Add(1))
wm := icmp.Message{
Type: ipv4.ICMPTypeEcho,
Code: 0,
Body: &icmp.Echo{ID: m.icmpID, Seq: seq, Data: []byte("lab-status")},
}
wb, err := wm.Marshal(nil)
if err != nil {
return false
}
if _, err := m.icmp.WriteTo(wb, &net.UDPAddr{IP: ip}); err != nil {
return false
}
m.icmp.SetReadDeadline(time.Now().Add(timeout))
reply := make([]byte, 1500)
for {
n, peer, err := m.icmp.ReadFrom(reply)
if err != nil {
return false
}
pa, ok := peer.(*net.UDPAddr)
if !ok || !pa.IP.Equal(ip) {
continue
}
rm, err := icmp.ParseMessage(1, reply[:n])
if err != nil {
continue
}
if rm.Type != ipv4.ICMPTypeEchoReply {
continue
}
if echo, ok := rm.Body.(*icmp.Echo); ok && echo.ID == m.icmpID && echo.Seq == seq {
return true
}
}
}
func (m *Monitor) tcpPing(ip net.IP, port int, timeout time.Duration) bool {
if ip == nil {
return false
}
addr := net.JoinHostPort(ip.String(), strconv.Itoa(port))
conn, err := net.DialTimeout("tcp", addr, timeout)
if err != nil {
return false
}
conn.Close()
return true
}
func (m *Monitor) sshLoop(ctx context.Context, mc Machine) {
if mc.SSH.Key == "" || mc.SSH.Script == "" {
return
}
interval := mc.SSH.Interval.Duration
if interval <= 0 {
interval = 10 * time.Minute
}
jitter := interval / 4
if jitter <= 0 {
jitter = interval
}
// stagger the first run within [0, interval) so machines don't all connect at once
timer := time.NewTimer(rand.N(interval))
defer timer.Stop()
for {
select {
case <-ctx.Done():
return
case <-timer.C:
m.runSSH(ctx, mc)
// drift each run by a random offset to keep machines out of phase
timer.Reset(interval + rand.N(jitter))
}
}
}
func (m *Monitor) runSSH(ctx context.Context, mc Machine) {
start := time.Now()
st := m.state(mc)
if st == nil {
return
}
key, err := ssh.ParsePrivateKey([]byte(mc.SSH.Key))
if err != nil {
log.Printf("ssh %s: bad key: %v", mc.Host, err)
m.setSSHError(st, fmt.Sprintf("bad ssh key: %v", err))
return
}
cfg := &ssh.ClientConfig{
User: mc.SSH.User,
Auth: []ssh.AuthMethod{ssh.PublicKeys(key)},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
Timeout: mc.Ping.Timeout.Duration,
}
addr := net.JoinHostPort(mc.Host, strconv.Itoa(mc.SSH.Port))
log.Printf("ssh %s: connecting to %s", mc.Host, addr)
client, err := ssh.Dial("tcp", addr, cfg)
if err != nil {
log.Printf("ssh %s: dial failed: %v", mc.Host, err)
m.setSSHError(st, fmt.Sprintf("ssh dial: %v", err))
return
}
defer client.Close()
log.Printf("ssh %s: connected", mc.Host)
session, err := client.NewSession()
if err != nil {
log.Printf("ssh %s: session failed: %v", mc.Host, err)
m.setSSHError(st, fmt.Sprintf("ssh session: %v", err))
return
}
defer session.Close()
timeout := mc.SSH.Interval.Duration
if timeout > 30*time.Minute {
timeout = 30 * time.Minute
}
log.Printf("ssh %s: running script", mc.Host)
type cmdResult struct {
out []byte
err error
}
done := make(chan cmdResult, 1)
go func() {
out, err := session.CombinedOutput(mc.SSH.Script)
done <- cmdResult{out, err}
}()
select {
case r := <-done:
var exitCode *int
if r.err != nil {
var ee *ssh.ExitError
if errors.As(r.err, &ee) {
ec := ee.ExitStatus()
exitCode = &ec
log.Printf("ssh %s: script done in %s, exit %d", mc.Host, time.Since(start), ec)
} else {
log.Printf("ssh %s: script failed: %v", mc.Host, r.err)
m.setSSHError(st, fmt.Sprintf("ssh command: %v", r.err))
return
}
} else {
log.Printf("ssh %s: script done in %s, exit 0", mc.Host, time.Since(start))
}
st.mu.Lock()
st.sshResult = &sshResultState{
Ok: exitCode == nil,
Result: string(r.out),
ExitCode: exitCode,
LastRun: time.Now(),
}
st.mu.Unlock()
if exitCode == nil {
m.accumulateMetrics(st, mc.ID, string(r.out), time.Now())
}
case <-time.After(timeout):
session.Close()
log.Printf("ssh %s: timed out after %s", mc.Host, timeout)
m.setSSHError(st, fmt.Sprintf("ssh command timed out after %s", timeout))
case <-ctx.Done():
log.Printf("ssh %s: aborted", mc.Host)
return
}
}
func (m *Monitor) setSSHError(st *machineState, msg string) {
st.mu.Lock()
defer st.mu.Unlock()
st.sshResult = &sshResultState{
Ok: false,
Error: msg,
LastRun: time.Now(),
ExitCode: nil,
}
}
type parsedMetric struct {
name string
value float64
unit string
}
func parseMetrics(out string) []parsedMetric {
metrics := []parsedMetric{}
for _, line := range strings.Split(out, "\n") {
if strings.Contains(line, "---") {
break
}
parts := strings.SplitN(line, ":", 3)
if len(parts) < 3 {
continue
}
name := strings.TrimSpace(parts[0])
status := strings.TrimSpace(parts[1])
if name == "" || status != "metric" {
continue
}
val := strings.TrimSpace(parts[2])
num := 0.0
unit := ""
for i, r := range val {
if (r >= '0' && r <= '9') || r == '.' || r == '-' || r == '+' {
continue
}
if p, err := strconv.ParseFloat(strings.TrimSpace(val[:i]), 64); err == nil {
num = p
unit = strings.TrimSpace(val[i:])
}
break
}
if unit == "" && val != "" {
if p, err := strconv.ParseFloat(val, 64); err == nil {
num = p
} else {
continue
}
}
metrics = append(metrics, parsedMetric{name: name, value: num, unit: unit})
}
return metrics
}
func (m *Monitor) accumulateMetrics(st *machineState, machineID, out string, now time.Time) {
metrics := parseMetrics(out)
if len(metrics) == 0 {
return
}
ts := now.Unix()
st.mu.Lock()
if st.metrics == nil {
st.metrics = make(map[string]metricState, len(metrics))
}
for _, p := range metrics {
st.metrics[p.name] = metricState{value: p.value, unit: p.unit, updated: now}
}
st.mu.Unlock()
if m.history != nil {
for _, p := range metrics {
m.history.RecordMetric(machineID, p.name, ts, p.value, p.unit)
}
}
}
func (m *Monitor) StatusPayload() statusPayload {
var dbSize, dbSizeMonth int64
var dbRows int
if m.history != nil {
dbSize = m.history.Size()
rows, firstTS := m.history.Stats()
dbRows = rows
if rows > 0 && firstTS > 0 {
elapsed := time.Now().Unix() - firstTS
if elapsed < 1 {
elapsed = 1
}
perSec := float64(dbSize) / float64(elapsed)
dbSizeMonth = dbSize + int64(perSec*float64(30*24*3600))
}
}
p := statusPayload{
Title: m.cfg.Title,
Interactive: m.interactive,
SharedMetricWindow: m.cfg.SharedMetricWindow,
Stats: statsPayload{
PingInterval: m.cfg.Ping.Interval.Duration.String(),
PingTimeout: m.cfg.Ping.Timeout.Duration.String(),
TCPPort: m.cfg.Ping.TCPPort,
SSHInterval: m.cfg.SSH.Interval.Duration.String(),
SSHEnabled: m.cfg.SSH.Key != "" && m.cfg.SSH.Script != "",
DBSize: dbSize,
DBRows: dbRows,
DBSizeMonth: dbSizeMonth,
},
Groups: []groupStatus{},
Machines: []machineStatus{},
}
if len(m.cfg.Metrics) > 0 {
p.MetricRanges = make(map[string]metricRange, len(m.cfg.Metrics))
for name, r := range m.cfg.Metrics {
p.MetricRanges[name] = metricRange{Min: r.Min, Max: r.Max}
}
}
grouped := map[string][]machineStatus{}
order := []string{}
appendStatus := func(mc Machine, group string) {
st := m.state(mc)
ms := machineStatus{
ID: mc.ID,
Name: mc.Name,
Host: mc.Host,
SSHConfigured: mc.SSH.Key != "" && mc.SSH.Script != "",
}
if st != nil {
st.mu.RLock()
ms.Status = st.status
ms.ICMP = st.icmp
ms.TCP = st.tcp
ms.IP = st.ip
ms.IPs = append([]string{}, st.ips...)
if !st.lastPing.IsZero() {
t := st.lastPing
ms.LastPing = &t
}
if st.sshResult != nil {
s := *st.sshResult
ms.SSH = &s
}
if len(st.metrics) > 0 {
ms.Metrics = make([]metricStatus, 0, len(st.metrics))
for name, mtr := range st.metrics {
ms.Metrics = append(ms.Metrics, metricStatus{
Name: name,
Value: mtr.value,
Unit: mtr.unit,
Updated: &mtr.updated,
})
}
}
st.mu.RUnlock()
} else {
ms.Status = statusUnknown
ms.ICMP = checkNA
ms.TCP = checkNA
}
if group == "" {
p.Machines = append(p.Machines, ms)
return
}
if _, ok := grouped[group]; !ok {
order = append(order, group)
}
grouped[group] = append(grouped[group], ms)
}
for _, g := range m.cfg.Groups {
for _, mc := range g.Machines {
appendStatus(resolveMachine(mc, g.Name, m.cfg), g.Name)
}
}
for _, mc := range m.cfg.Machines {
if mc.Group == "" {
appendStatus(mc, "")
}
}
for _, name := range order {
p.Groups = append(p.Groups, groupStatus{Name: name, Machines: grouped[name]})
}
return p
}
func (m *Monitor) statusHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(m.StatusPayload())
}
func (m *Monitor) historyHandler(w http.ResponseWriter, r *http.Request) {
machine := r.PathValue("machine")
if machine == "" {
http.Error(w, "missing machine", http.StatusBadRequest)
return
}
limit, err := strconv.Atoi(r.URL.Query().Get("limit"))
if err != nil {
limit = 500
}
entries, err := m.history.Query(machine, limit)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(entries)
}
func (m *Monitor) metricsHandler(w http.ResponseWriter, r *http.Request) {
if m.history == nil {
http.Error(w, "no history db", http.StatusInternalServerError)
return
}
machine := r.PathValue("machine")
if machine == "" {
http.Error(w, "missing machine", http.StatusBadRequest)
return
}
q := r.URL.Query()
maxPoints := 100
if v := q.Get("max_points"); v != "" {
if n, err := strconv.Atoi(v); err == nil {
maxPoints = n
}
} else if v := q.Get("limit"); v != "" {
if n, err := strconv.Atoi(v); err == nil {
maxPoints = n
}
}
var minTS, maxTS int64
if v := q.Get("min"); v != "" {
minTS, _ = strconv.ParseInt(v, 10, 64)
}
if v := q.Get("max"); v != "" {
maxTS, _ = strconv.ParseInt(v, 10, 64)
}
entries, err := m.history.QueryMetrics(machine, q.Get("name"), minTS, maxTS, maxPoints, q.Get("shared") != "")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(entries)
}
func (m *Monitor) metricsAggregateHandler(w http.ResponseWriter, r *http.Request) {
if m.history == nil {
http.Error(w, "no history db", http.StatusInternalServerError)
return
}
q := r.URL.Query()
var minTS, maxTS int64
if v := q.Get("min"); v != "" {
minTS, _ = strconv.ParseInt(v, 10, 64)
}
if v := q.Get("max"); v != "" {
maxTS, _ = strconv.ParseInt(v, 10, 64)
}
metrics, window, err := m.history.QueryMetricsAll(minTS, maxTS)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(struct {
Window [2]int64 `json:"window"`
Metrics []MetricAggregate `json:"metrics"`
}{window, metrics})
}
func (m *Monitor) refreshHandler(w http.ResponseWriter, r *http.Request) {
if !m.interactive {
http.Error(w, "interactive mode disabled", http.StatusForbidden)
return
}
id := r.PathValue("machine")
mc, ok := m.machinesByID[id]
if !ok {
http.Error(w, "machine not found", http.StatusNotFound)
return
}
log.Printf("interactive refresh scheduled for %s (%s)", mc.Name, mc.Host)
m.Refresh(mc)
w.WriteHeader(http.StatusAccepted)
}
src/app.tsx
+1162
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src/jsx.d.ts
Vendored
+13
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@@ -0,0 +1,13 @@
declare module 'preact/jsx-runtime' {
namespace JSX {
interface IntrinsicElements {
'iconify-icon': {
icon?: string
width?: number | string
height?: number | string
}
}
}
}
export {}
src/main.tsx
+10
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@@ -0,0 +1,10 @@
import { render } from 'preact'
import { App } from './app'
import '@fontsource/inria-sans/400.css'
import '@fontsource/inria-sans/700.css'
import '@fontsource/inria-sans/400-italic.css'
import '@fontsource/iosevka-etoile/400.css'
import '@fontsource/iosevka-etoile/600.css'
import './styles.css'
render(<App />, document.getElementById('app')!)
src/styles.css
+1018
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tsconfig.json
+31
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@@ -0,0 +1,31 @@
{
"compilerOptions": {
// Environment setup & latest features
"lib": ["ESNext", "DOM", "DOM.Iterable"],
"target": "ESNext",
"module": "Preserve",
"moduleDetection": "force",
"jsx": "react-jsx",
"jsxImportSource": "preact",
"allowJs": true,
"types": ["bun"],
// Bundler mode
"moduleResolution": "bundler",
"allowImportingTsExtensions": true,
"verbatimModuleSyntax": true,
"noEmit": true,
// Best practices
"strict": true,
"skipLibCheck": true,
"noFallthroughCasesInSwitch": true,
"noUncheckedIndexedAccess": true,
"noImplicitOverride": true,
// Some stricter flags (disabled by default)
"noUnusedLocals": false,
"noUnusedParameters": false,
"noPropertyAccessFromIndexSignature": false
}
}
vite.config.ts
+11
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@@ -0,0 +1,11 @@
import { defineConfig } from 'vite'
import preact from '@preact/preset-vite'
export default defineConfig({
plugins: [preact()],
server: {
proxy: {
'/api': 'http://localhost:5000',
},
},
})