func (s *Service) Open() error {
switch s.c.File {
case "STDERR":
s.f = &nopCloser{f: s.stderr}
case "STDOUT":
s.f = &nopCloser{f: s.stdout}
default:
dir := path.Dir(s.c.File)
if _, err := os.Stat(dir); os.IsNotExist(err) {
err := os.MkdirAll(dir, 0755)
if err != nil {
return err
}
}
f, err := os.OpenFile(s.c.File, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0640)
if err != nil {
return err
}
s.f = f
}
// Configure default logger
log.SetPrefix("[log] ")
log.SetFlags(log.LstdFlags)
log.SetOutput(wlog.NewWriter(s.f))
wlog.SetLevelFromName(s.c.Level)
return nil
}
// serveLogLevel sets the log level of the server
func (h *Handler) serveLogLevel(w http.ResponseWriter, r *http.Request) {
var opt client.LogLevelOptions
dec := json.NewDecoder(r.Body)
err := dec.Decode(&opt)
if err != nil {
HttpError(w, "invalid json: "+err.Error(), true, http.StatusBadRequest)
return
}
err = wlog.SetLevelFromName(opt.Level)
if err != nil {
HttpError(w, err.Error(), true, http.StatusBadRequest)
return
}
w.WriteHeader(http.StatusNoContent)
}
func main() {
// Parse flags
flag.Parse()
// Setup logging
log.SetOutput(wlog.NewWriter(os.Stderr))
if err := wlog.SetLevelFromName(*logLevel); err != nil {
log.Fatal("E! ", err)
}
if *socket == "" {
a := agent.New(os.Stdin, os.Stdout)
h := newHandler(a)
a.Handler = h
log.Println("I! Starting agent using STDIN/STDOUT")
a.Start()
err := a.Wait()
if err != nil {
log.Fatal("E! ", err)
}
log.Println("I! Agent finished")
} else {
// Create unix socket
addr, err := net.ResolveUnixAddr("unix", *socket)
if err != nil {
log.Fatal("E! ", err)
}
l, err := net.ListenUnix("unix", addr)
if err != nil {
log.Fatal("E! ", err)
}
// Create server that listens on the socket
s := agent.NewServer(l, &accepter{})
// Setup signal handler to stop Server on various signals
s.StopOnSignals(os.Interrupt, syscall.SIGTERM)
log.Println("I! Socket server listening on", addr.String())
err = s.Serve()
if err != nil {
log.Fatal("E! ", err)
}
log.Println("I! Socket server stopped")
}
}
// Initialize the Handler with the provided options.
func (h *Handler) Init(r *udf.InitRequest) (*udf.InitResponse, error) {
init := &udf.InitResponse{
Success: true,
}
var errors []string
for _, opt := range r.Options {
switch opt.Name {
case "field":
h.field = opt.Values[0].Value.(*udf.OptionValue_StringValue).StringValue
case "scoreField":
h.scoreField = opt.Values[0].Value.(*udf.OptionValue_StringValue).StringValue
case "minSupport":
h.minSupport = opt.Values[0].Value.(*udf.OptionValue_DoubleValue).DoubleValue
case "errorTolerance":
h.errorTolerance = opt.Values[0].Value.(*udf.OptionValue_DoubleValue).DoubleValue
case "consensus":
h.consensus = opt.Values[0].Value.(*udf.OptionValue_DoubleValue).DoubleValue
case "logLevel":
level := opt.Values[0].Value.(*udf.OptionValue_StringValue).StringValue
err := wlog.SetLevelFromName(level)
if err != nil {
init.Success = false
errors = append(errors, err.Error())
}
default:
if info, ok := fingerprinters[opt.Name]; ok {
createFn, err := info.init(opt.Values)
if err != nil {
init.Success = false
errors = append(errors, err.Error())
} else {
h.fingerprinters = append(h.fingerprinters, createFn)
}
} else {
return nil, fmt.Errorf("received unknown init option %q", opt.Name)
}
}
}
if h.field == "" {
errors = append(errors, "field must not be empty")
}
if h.minSupport < 0 || h.minSupport > 1 {
errors = append(errors, "minSupport must be in the range [0,1)")
}
if h.errorTolerance < 0 || h.errorTolerance > 1 {
errors = append(errors, "errorTolerance must be in the range [0,1)")
}
if (h.consensus != -1 && h.consensus < 0) || h.consensus > 1 {
errors = append(errors, "consensus must be in the range [0,1) or equal to -1")
}
if h.minSupport <= h.errorTolerance {
errors = append(errors, "invalid minSupport or errorTolerance: minSupport must be greater than errorTolerance")
}
init.Success = len(errors) == 0
init.Error = strings.Join(errors, "\n")
log.Printf("D! %#v", h)
return init, nil
}