72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
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// SPDX-License-Identifier: MIT
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package main
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import (
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"bufio"
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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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"github.com/alexjch/go-dmesg/pkg/dmesg"
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"github.com/gokrazy/gokrazy"
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)
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// Primitives are:
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// - scanner, a bufio.Scanner that reads from /dev/kmsg
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// - decoder, a dmesg.Decoder that wraps a scanner and decodes log records
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// {decoder{scanner}}}
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var LEVELS = map[uint8]string{
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0: "Emergency",
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1: "Alert",
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2: "Critical",
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3: "Error",
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4: "Warning",
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5: "Notice",
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6: "Info",
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7: "Debug",
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}
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func NewScanner() (*dmesg.Scanner, error) {
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// Open /dev/kmsg for reading in a non-blocking manner
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f, err := os.OpenFile("/dev/kmsg", syscall.O_RDONLY|syscall.O_NONBLOCK, 0)
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if err != nil {
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return nil, fmt.Errorf("Failed to open kernel log: %w", err)
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}
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f.Seek(0, 3)
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// Wrap an os.File in a bufio.Scanner
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scanner := bufio.NewScanner(f)
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return &dmesg.Scanner{
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Scanner: *scanner,
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ReadCloser: f,
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}, nil
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}
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func main() {
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gokrazy.WaitForClock()
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// Handle Ctrl-C
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt)
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// Create a scanner
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scan, err := NewScanner()
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if err != nil {
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panic(err)
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}
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defer scan.Close()
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// Create a decoder
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dec, err := dmesg.NewDecoder(scan)
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if err != nil {
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panic(err)
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}
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// Stop the decoder when Ctrl-C is pressed
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go func() {
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<-c
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dec.Stop()
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}()
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// Follow the decoder until Ctrl-C is pressed
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if err := dec.Follow(func(r *dmesg.Record) {
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fmt.Printf("%9s: %v: %s\n", LEVELS[r.Priority], r.Timestamp, r.Message)
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}); err != nil {
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panic(err)
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}
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}
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