mirror of
https://github.com/tale/headplane.git
synced 2026-08-27 07:27:41 +00:00
Aarnav Tale
69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
package main
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import (
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"crypto/tls"
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"fmt"
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"net/http"
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"os"
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"strings"
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"time"
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)
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// hp_healthcheck pings the Headplane healthz endpoint. It's invoked
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// from the Docker HEALTHCHECK directive inside the same container
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// as Headplane itself.
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//
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// To stay fully zero-config, Headplane writes the exact URL the
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// healthcheck should hit — scheme, port, and basename included — to
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// listenFile when it starts accepting connections (see
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// runtime/http.ts and app/server/main.ts). This binary just reads
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// that file and GETs the URL verbatim. No env vars, no YAML
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// parsing, no path-joining, no compile-time knowledge of the
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// basename.
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//
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// If the file is missing (e.g. the server hasn't finished booting
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// on the very first probe, or this is an old image being run with
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// a new healthcheck) we fall back to the historical default.
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const (
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listenFile = "/tmp/headplane-listen"
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defaultURL = "http://localhost:3000/admin/healthz"
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)
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func main() {
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url := readListenFile()
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client := http.Client{
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Timeout: 5 * time.Second,
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Transport: &http.Transport{
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// Self-signed certs are normal for in-process TLS termination
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TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
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},
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}
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resp, err := client.Get(url)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Health check failed: %v\n", err)
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os.Exit(1)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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fmt.Fprintf(os.Stderr, "Health check returned non-OK status: %d\n", resp.StatusCode)
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os.Exit(1)
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}
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fmt.Println("Health check passed.")
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}
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func readListenFile() string {
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data, err := os.ReadFile(listenFile)
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if err != nil {
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return defaultURL
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}
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url := strings.TrimSpace(string(data))
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if url == "" {
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return defaultURL
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}
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return url
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}
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