forked from boyska/circolog
130 lines
3 KiB
Go
130 lines
3 KiB
Go
package formatter
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import (
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"encoding/json"
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"fmt"
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"hash/fnv"
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"io"
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"text/template"
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"time"
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"git.lattuga.net/boyska/circolog"
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"github.com/mgutz/ansi"
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"gopkg.in/mgo.v2/bson"
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)
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// Formatter is an interface, so that multiple implementations can exist
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type Formatter func(circolog.Message) string
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var tmplFuncs template.FuncMap
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var syslogTmpl *template.Template
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func init() {
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tmplFuncs := template.FuncMap{
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"dateFormat": func(dt time.Time, fmt string) string {
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return dt.Format(fmt)
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},
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"rfc822": func(dt time.Time) string {
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return dt.Format(time.RFC822)
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},
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"sevName": func(s int) string {
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names := []string{"emerg ", "alert ", "crit ", "err ", "warn ", "notice", "info ", "dbg "}
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switch {
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case s < 2: // emerg..alert
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return ansi.Color(names[s], "red+b")
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case s < 4: // emerg..err
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return ansi.Color(names[s], "red")
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case s < 6: // warn..notice
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return ansi.Color(names[s], "white+b")
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case s >= len(names):
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return "???"
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default:
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return names[s]
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}
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},
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"color": func(color, text string) string {
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return ansi.Color(text, color) // slow; should use colorfunc
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},
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"red": ansi.ColorFunc("red+b"),
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"autoColor": func(s string) string {
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// from https://weechat.org/blog/post/2011/08/28/Beautify-your-WeeChat
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palette := []string{"31", "35", "38", "40", "49", "63", "70", "80", "92", "99", "112", "126", "130", "138", "142", "148", "167", "169", "174", "176", "178", "184", "186", "210", "212", "215", "247"}
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hash := fnv.New32()
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hash.Write([]byte(s))
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picked := palette[int(hash.Sum32())%len(palette)]
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return ansi.Color(s, picked)
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},
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}
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syslogTmpl = template.Must(template.New("syslog").Funcs(tmplFuncs).Parse(
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"{{color \"yellow\" (rfc822 (index . \"time\")) }} {{index . \"hostname\"}} " +
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"{{index . \"prog\" | autoColor}}" +
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"{{ if (ne (index . \"proc_id\") \"-\")}}[{{index . \"proc_id\"}}]{{end}}: " +
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"{{ sevName (index . \"sev\") }} " +
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"{{index . \"msg\"}}",
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))
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}
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type Format int
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func (rf *Format) Set(v string) error {
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newvalue, err := parseFormat(v)
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if err != nil {
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return err
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}
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*rf = newvalue
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return nil
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}
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func (rf Format) String() string {
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switch rf {
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case FormatJSON:
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return "json"
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case FormatSyslog:
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return "syslog"
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case FormatBSON:
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return "bson"
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}
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return ""
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}
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func (rf Format) WriteFormatted(w io.Writer, msg circolog.Message) error {
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return WriteFormatted(w, rf, msg)
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}
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func parseFormat(s string) (Format, error) {
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switch s {
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case "json":
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return FormatJSON, nil
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case "syslog":
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return FormatSyslog, nil
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case "bson":
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return FormatBSON, nil
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default:
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return 0, fmt.Errorf("Undefined format `%s`", s)
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}
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}
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const (
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FormatSyslog = iota // 0
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FormatJSON = iota
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FormatBSON = iota
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)
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func WriteFormatted(w io.Writer, f Format, msg circolog.Message) error {
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switch f {
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case FormatSyslog:
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return syslogTmpl.Execute(w, msg)
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case FormatJSON:
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enc := json.NewEncoder(w)
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enc.SetIndent("", " ")
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return enc.Encode(msg)
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case FormatBSON:
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enc, err := bson.Marshal(msg)
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if err != nil {
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return err
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}
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_, err = w.Write(enc)
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return err
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}
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return nil
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}
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