func main() {
fmt.Println("# Default Capture :")
g := grok.New()
values, _ := g.Parse("%{COMMONAPACHELOG}", `127.0.0.1 - - [23/Apr/2014:22:58:32 +0200] "GET /index.php HTTP/1.1" 404 207`)
for k, v := range values {
fmt.Printf("%+15s: %s\n", k, v)
}
fmt.Println("\n# Named Capture :")
g = grok.NewWithConfig(&grok.Config{NamedCapturesOnly: true})
values, _ = g.Parse("%{COMMONAPACHELOG}", `127.0.0.1 - - [23/Apr/2014:22:58:32 +0200] "GET /index.php HTTP/1.1" 404 207`)
for k, v := range values {
fmt.Printf("%+15s: %s\n", k, v)
}
fmt.Println("\n# Add custom patterns :")
// We add 3 patterns to our Grok instance, to structure an IRC message
g = grok.NewWithConfig(&grok.Config{NamedCapturesOnly: true})
g.AddPattern("IRCUSER", `\A@(\w+)`)
g.AddPattern("IRCBODY", `.*`)
g.AddPattern("IRCMSG", `%{IRCUSER:user} .* : %{IRCBODY:message}`)
values, _ = g.Parse("%{IRCMSG}", `@vjeantet said : Hello !`)
for k, v := range values {
fmt.Printf("%+15s: %s\n", k, v)
}
}
func main() {
if len(os.Args[1:]) < 2 {
fmt.Println("--------------------------------")
fmt.Println("grok")
fmt.Println("--------------------------------")
fmt.Println("usage: ")
fmt.Println("\tgrok <filename> \"<pattern>\" [patternsDir] [newLinePattern]\n\r")
fmt.Println("*error* filename and pattern are required arguments")
return
}
g := grok.New()
file := os.Args[1]
pattern := os.Args[2]
fmt.Println("...scanning", file, "for pattern", pattern)
if len(os.Args[1:]) >= 3 {
patternsDir := os.Args[3]
err := loadPatternsDir(patternsDir, *g) //g.AddPatternsFromPath(patternsDir) // not working!
if err != nil {
log.Fatalf("oops", err)
}
}
if len(os.Args[1:]) >= 4 {
newLinePattern := os.Args[4]
fmt.Println("newline pattern:", newLinePattern)
fmt.Println("*warning* multiline pattern matching is not yet implemented")
}
// yet to be implemented
err := readLines(file, func(line string) {
// err := readLinesWithRegex(file, "^\\d", func(line string) {
log.Println("--- newline ---", line)
values, _ := g.Parse(pattern, line)
for k, v := range values {
log.Println(fmt.Sprintf("%+15s: %s", k, v))
}
})
if err != nil {
log.Fatal(err)
}
}
func main() {
pattern := flag.String("pattern", "%{GREEDYDATA:msg}", "a grok expression")
namedcapture := flag.Bool("namedcapture", false, "parse only named captures (default is false)")
flag.Parse()
var g *grok.Grok
if *namedcapture {
g = grok.NewWithConfig(&grok.Config{NamedCapturesOnly: true})
} else {
g = grok.New()
}
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
line := scanner.Text()
values, _ := g.Parse(*pattern, line)
delete(values, "")
encoded, _ := json.Marshal(values)
fmt.Println(string(encoded))
}
}