jochen
66a816c3ac
The second review of #129 found a read stuck in the kernel kept the file fresh and the module healthy, smartd as a second reader could wake or keep awake the drives the watch spares, and a board chip's maximum could stop a fan. Read each drive in its own goroutine from a root reader of the module's own, mark each read in flight, and say a read past its bound or a drive not looked at for twice its cadence; drop smartd; tell smartctl each drive's kind; take a SAS drive's standby; say a drive asleep since when.
46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
// The sensors module's Go bundle (novox/hq ADR 0256): the condition of a machine's own hardware —
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// temperatures with their own thresholds, fans, each drive's health, the kernel's counts of hardware
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// errors — read from /sys and /proc, and changing nothing.
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//
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// One binary, two ways to run. With no argument it is the bundle the node's tool runner launches and
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// speaks MCP to over stdio (ADR 0188, ADR 0193), as the operator account. With `watch` and `drives` it is
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// one of the module's two long-running processes, run by the node-engine as root: the fan watch, and the
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// drive reader (watch.go).
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package main
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import (
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"context"
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"fmt"
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"os"
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"os/signal"
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"syscall"
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stdio "git.novox.be/novox/mesh-sdk/go"
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)
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func main() {
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if len(os.Args) > 1 {
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ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGTERM, os.Interrupt)
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defer stop()
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switch os.Args[1] {
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case "watch":
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w := NewFanWatch(Here())
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every(ctx, "watch", w.Look)
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case "drives":
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r := NewDriveReader(Here())
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r.Async = true
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every(ctx, "drives", r.Look)
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default:
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fmt.Fprintf(os.Stderr, "sensors: %q is not a way to run; with no argument it serves its tools, with watch it "+
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"watches the fans, with drives it reads the drives\n", os.Args[1])
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os.Exit(2)
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}
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return
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}
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// An empty name serves as the module the runtime names (MESH_SERVED_MODULE): sensors.
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if err := stdio.Serve("", Tools(Here())); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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