119 lines
2.0 KiB
Go
119 lines
2.0 KiB
Go
package main
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import (
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"bytes"
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"fmt"
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"io"
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"time"
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"github.com/coreos/go-systemd/sdjournal"
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)
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type LogPipe struct {
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Chan chan []byte
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Cancel chan time.Time
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buf []byte
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}
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func (lp *LogPipe) Write(p []byte) (n int, err error) {
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bs := []byte(search)
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lp.buf = append(lp.buf, p...)
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for bytes.Contains(lp.buf, []byte("\n")) {
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i := bytes.Index(lp.buf, []byte("\n"))
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s := lp.buf[0 : i+1]
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lp.buf = lp.buf[i+1:]
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if bytes.Contains(s, bs) {
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lp.Chan <- s
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}
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}
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return len(p), nil
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}
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func logPipe(matches []sdjournal.Match, filter []sdjournal.Match) *LogPipe {
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for _, f := range filter {
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matches = append(matches, f)
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}
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lp := LogPipe{
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Chan: make(chan []byte, 1024),
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Cancel: make(chan time.Time),
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}
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go func() {
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r, err := sdjournal.NewJournalReader(sdjournal.JournalReaderConfig{
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// NumFromTail: 2048,
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Since: time.Duration(-24) * time.Hour,
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Matches: matches,
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Formatter: logFormatter,
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})
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if err != nil {
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panic(err)
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}
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if r == nil {
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panic("journal reader is nil")
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}
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defer r.Close()
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defer close(lp.Chan)
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// and follow the reader synchronously
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if err = r.Follow(lp.Cancel, &lp); err != sdjournal.ErrExpired {
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panic(err)
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}
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}()
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return &lp
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}
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func pipeReader(r *LogPipe, w io.Writer) {
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for {
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var buf []byte
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done := false
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for !done {
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select {
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case l, ok := <-r.Chan:
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if !ok {
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return
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}
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buf = append(buf, l...)
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default:
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done = true
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time.Sleep(50 * time.Millisecond)
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}
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}
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if len(buf) > 0 {
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w.Write(buf)
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}
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}
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}
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func logFormatter(entry *sdjournal.JournalEntry) (string, error) {
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color := "gray"
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switch entry.Fields["PRIORITY"] {
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case "0":
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fallthrough
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case "1":
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fallthrough
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case "2":
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fallthrough
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case "3":
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color = "red"
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case "4":
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color = "darkred"
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case "5":
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color = "silver"
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}
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return fmt.Sprintf("[green]%s [blue]%s [%s]%s\n",
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time.Unix(0, int64(entry.RealtimeTimestamp)*int64(time.Microsecond)).Format("Jan 02 15:04:05"),
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entry.Fields["SYSLOG_IDENTIFIER"],
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color,
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entry.Fields["MESSAGE"]), nil
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}
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