/
syslog.go
270 lines (222 loc) · 6.04 KB
/
syslog.go
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package app
import (
"context"
"reflect"
"regexp"
"time"
"github.com/archaron/juniper-natlog/common"
"github.com/archaron/juniper-natlog/modules/clickhouse"
"github.com/im-kulikov/helium/service"
"github.com/im-kulikov/helium/web"
"github.com/mitchellh/mapstructure"
"github.com/spf13/viper"
"go.uber.org/dig"
"go.uber.org/zap"
"gopkg.in/mcuadros/go-syslog.v2"
)
type (
syslogParams struct {
dig.In
Viper *viper.Viper
Logger *zap.Logger
CH *clickhouse.Service
}
syslogOutParams struct {
dig.Out
Service service.Service `group:"services"`
}
syslogListener struct {
timeout time.Duration
log *zap.Logger
address string
msgChannel syslog.LogPartsChannel
handler *syslog.ChannelHandler
server *syslog.Server
ch *clickhouse.Service
rules common.Rules
}
)
func (s *syslogListener) registerModels() {
for _, r := range s.rules {
model := common.Model{
Table: r.Table,
}
log := s.log.With(zap.String("rule", r.Name))
for i, f := range r.Fields {
name, ok := f["name"].(string)
if !ok {
log.Fatal("field name is not specified or is not a string", zap.Int("index", i))
}
log := log.With(zap.Int("index", i), zap.String("name", name))
t, ok := f["type"].(string)
if !ok {
log.Fatal("field typ is not specified or is not a string")
}
log = log.With(zap.String("type", t))
modelField := common.ModelField{
Name: name,
Type: t,
}
switch t {
case "string":
model.Fields = append(model.Fields, &common.StringModelField{
ModelField: modelField,
})
case "timestamp":
layout, ok := f["default"].(string)
if !ok {
log.Debug("no layout for timestamp parse, using default")
layout = "2006-01-02 15:04:05"
}
model.Fields = append(model.Fields, &common.TimestampModelField{
ModelField: modelField,
Layout: layout,
})
case "list":
values, ok := f["values"].(map[interface{}]interface{})
if !ok {
log.Fatal("model field of type list must contain 'values' of string(key)=>int(value) pairs", zap.Any("values", values))
}
var defaultValue *int = nil
def, ok := f["default"].(int)
if ok {
defaultValue = &def
}
listValues := make(map[string]int)
for k := range values {
key, ok := k.(string)
if !ok {
log.Fatal("cannot parse list key as string", zap.Any("key", k))
}
val, ok := values[k].(int)
if !ok {
log.Fatal("cannot parse list value as int", zap.String("key", key), zap.Any("value", values[k]))
}
listValues[key] = val
}
model.Fields = append(model.Fields, &common.ListModelField{
ModelField: modelField,
Values: listValues,
Default: defaultValue,
})
case "ip2int":
model.Fields = append(model.Fields, &common.IpToIntModelField{
ModelField: modelField,
})
case "int16":
model.Fields = append(model.Fields, &common.Int16ModelField{
ModelField: modelField,
})
case "uint16":
model.Fields = append(model.Fields, &common.UInt16ModelField{
ModelField: modelField,
})
default:
log.Fatal("unknown field type")
}
}
s.ch.RegisterModel(r.Name, &model)
}
}
func (s *syslogListener) ListenAndServe() error {
s.msgChannel = make(syslog.LogPartsChannel)
s.handler = syslog.NewChannelHandler(s.msgChannel)
s.server = syslog.NewServer()
s.server.SetFormat(syslog.Automatic)
s.server.SetHandler(s.handler)
if err := s.server.ListenUDP(s.address); err != nil {
return err
}
if err := s.server.Boot(); err != nil {
return err
}
go s.messageHandler(s.msgChannel)
s.server.Wait()
return nil
}
func (s *syslogListener) messageHandler(channel syslog.LogPartsChannel) {
for logParts := range channel {
content, ok := logParts["content"].(string)
if !ok {
s.log.Fatal("cannot parse content", zap.Any("log_parts", logParts))
}
for i := range s.rules {
matches := s.rules[i].Regexp.FindAllStringSubmatch(content, -1)
if len(matches) == 0 {
continue
}
colsNum := len(s.rules[i].Fields)
for m := range matches {
if len(matches[m]) != colsNum+1 {
s.log.Error("fields count mismatch in regexp and in fields definition",
zap.Int("rule_fields_num", colsNum),
zap.Int("regexp_results", len(matches[m])-1),
zap.String("rule", s.rules[i].Name),
)
continue
}
msg := common.FlowMessage{
Rule: s.rules[i].Name,
Fields: make(map[string]string, colsNum),
}
for j := range s.rules[i].Fields {
fieldName, ok := s.rules[i].Fields[j]["name"].(string)
if !ok {
s.log.Fatal("field 'name' must be string", zap.Any("field", s.rules[i].Fields[j]))
}
msg.Fields[fieldName] = matches[m][j+1]
}
s.ch.Insert(&msg)
}
}
}
}
func (s *syslogListener) Shutdown(ctx context.Context) error {
if s.server != nil {
return s.server.Kill()
}
return nil
}
func newSyslogService(p syslogParams) (syslogOutParams, error) {
l := &syslogListener{
timeout: p.Viper.GetDuration("syslog.timeout"),
address: p.Viper.GetString("syslog.address"),
log: p.Logger,
ch: p.CH,
}
var svc service.Service
if err := p.Viper.UnmarshalKey("syslog.rules", &l.rules, viper.DecodeHook(
mapstructure.ComposeDecodeHookFunc(
mapstructure.StringToTimeDurationHookFunc(),
mapstructure.StringToSliceHookFunc(","),
StringToRegexp(),
))); err != nil {
return syslogOutParams{}, err
}
l.registerModels()
svc, err := web.NewListener(l,
web.ListenerShutdownTimeout(p.Viper.GetDuration("syslog.shutdown_timeout")),
web.ListenerName("syslog listener " + l.address),
)
return syslogOutParams{
Service: svc,
}, err
}
// StringToRegexp returns a DecodeHookFunc that converts
// strings to regexp.Regexp
func StringToRegexp() mapstructure.DecodeHookFunc {
return func(
f reflect.Type,
t reflect.Type,
data interface{}) (interface{}, error) {
if f.Kind() != reflect.String {
return data, nil
}
if t != reflect.TypeOf(regexp.Regexp{}) {
return data, nil
}
// Convert it by parsing
re, err := regexp.Compile(data.(string))
return re, err
}
}