/
loglistener.go
257 lines (212 loc) · 6.2 KB
/
loglistener.go
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package protolog
import (
"fmt"
"net"
"strconv"
"strings"
"time"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/Graylog2/go-gelf/gelf"
"github.com/hartfordfive/protologbeat/config"
"github.com/pquerna/ffjson/ffjson"
"github.com/xeipuuv/gojsonschema"
)
type LogListener struct {
config config.Config
jsonSchema map[string]gojsonschema.JSONLoader
logEntriesRecieved chan common.MapStr
logEntriesError chan bool
}
func NewLogListener(cfg config.Config) *LogListener {
ll := &LogListener{
config: cfg,
}
if !ll.config.EnableGelf && ll.config.EnableJsonValidation {
ll.jsonSchema = map[string]gojsonschema.JSONLoader{}
for name, path := range ll.config.JsonSchema {
logp.Info("Loading JSON schema %s from %s", name, path)
schemaLoader := gojsonschema.NewReferenceLoader("file://" + path)
ds := schemaLoader
ll.jsonSchema[name] = ds
}
}
return ll
}
func (ll *LogListener) Start(logEntriesRecieved chan common.MapStr, logEntriesError chan bool) {
ll.logEntriesRecieved = logEntriesRecieved
ll.logEntriesError = logEntriesError
address := fmt.Sprintf("%s:%d", ll.config.Address, ll.config.Port)
if ll.config.Protocol == "tcp" {
ll.startTCP(ll.config.Protocol, address)
} else if ll.config.EnableGelf {
ll.startGELF(address)
} else {
ll.startUDP(ll.config.Protocol, address)
}
}
func (ll *LogListener) startTCP(proto string, address string) {
l, err := net.Listen(proto, address)
if err != nil {
logp.Err("Error listening on % socket via %s: %v", ll.config.Protocol, address, err.Error())
ll.logEntriesError <- true
return
}
defer l.Close()
logp.Info("Now listening for logs via %s on %s", ll.config.Protocol, address)
for {
conn, err := l.Accept()
if err != nil {
logp.Err("Error accepting log event: %v", err.Error())
continue
}
buffer := make([]byte, ll.config.MaxMsgSize)
length, err := conn.Read(buffer)
if err != nil {
e, ok := err.(net.Error)
if ok && e.Timeout() {
logp.Err("Timeout reading from socket: %v", err)
ll.logEntriesError <- true
return
}
}
go ll.processMessage(strings.TrimSpace(string(buffer[:length])))
}
}
func (ll *LogListener) startUDP(proto string, address string) {
l, err := net.ListenPacket(proto, address)
if err != nil {
logp.Err("Error listening on % socket via %s: %v", ll.config.Protocol, address, err.Error())
ll.logEntriesError <- true
return
}
defer l.Close()
logp.Info("Now listening for logs via %s on %s", ll.config.Protocol, address)
for {
buffer := make([]byte, ll.config.MaxMsgSize)
length, _, err := l.ReadFrom(buffer)
if err != nil {
logp.Err("Error reading from buffer: %v", err.Error())
continue
}
if length == 0 {
return
}
go ll.processMessage(strings.TrimSpace(string(buffer[:length])))
}
}
func (ll *LogListener) startGELF(address string) {
gr, err := gelf.NewReader(address)
if err != nil {
logp.Err("Error starting GELF listener on %s: %v", address, err.Error())
ll.logEntriesError <- true
}
logp.Info("Listening for GELF encoded messages on %s...", address)
for {
msg, err := gr.ReadMessage()
if err != nil {
logp.Err("Could not read GELF message: %v", err)
} else {
go ll.processGelfMessage(msg)
}
}
}
func (ll *LogListener) Shutdown() {
close(ll.logEntriesError)
close(ll.logEntriesRecieved)
}
func (ll *LogListener) processMessage(logData string) {
if logData == "" {
logp.Err("Event is empty")
return
}
event := common.MapStr{}
if ll.config.EnableSyslogFormatOnly {
msg, facility, severity, err := GetSyslogMsgDetails(logData)
if err == nil {
event["facility"] = facility
event["severity"] = severity
event["message"] = msg
}
} else if ll.config.JsonMode {
if ll.config.MergeFieldsToRoot {
if err := ffjson.Unmarshal([]byte(logData), &event); err != nil {
logp.Err("Could not parse JSON: %v", err)
event["message"] = logData
event["tags"] = []string{"_protologbeat_json_parse_failure"}
goto PreSend
}
} else {
event = common.MapStr{}
nestedData := common.MapStr{}
if err := ffjson.Unmarshal([]byte(logData), &nestedData); err != nil {
logp.Err("Could not parse JSON: %v", err)
event["message"] = logData
event["tags"] = []string{"_protologbeat_json_parse_failure"}
goto PreSend
} else {
event["log"] = nestedData
}
}
schemaSet := false
hasType := false
if _, ok := event["type"]; ok {
hasType = true
}
if hasType {
_, schemaSet = ll.jsonSchema[event["type"].(string)]
}
if ll.config.ValidateAllJSONTypes && !schemaSet {
if ll.config.Debug && hasType {
logp.Err("Log entry of type '%s' has no JSON schema set.", event["type"].(string))
} else if ll.config.Debug {
logp.Err("Log entry has no type.")
}
return
}
if ll.config.EnableJsonValidation && schemaSet {
result, err := gojsonschema.Validate(ll.jsonSchema[event["type"].(string)], gojsonschema.NewStringLoader(logData))
if err != nil {
if ll.config.Debug {
logp.Err("Error with JSON object: %s", err.Error())
}
return
}
if !result.Valid() {
if ll.config.Debug {
logp.Err("Log entry does not match specified schema for type '%s'. (Note: ensure you have 'type' field (string) at the root level in your schema)", event["type"].(string))
}
return
}
}
} else {
event["message"] = logData
}
PreSend:
event["@timestamp"] = common.Time(time.Now())
ll.logEntriesRecieved <- event
}
func (ll *LogListener) processGelfMessage(msg *gelf.Message) {
event := common.MapStr{}
event["gelf"] = map[string]interface{}{"version": msg.Version}
event["host"] = msg.Host
event["type"] = ll.config.DefaultEsLogType
event["short_message"] = msg.Short
event["full_message"] = msg.Full
// 1 ms = 1000000 ns
if msg.TimeUnix == 0 {
event["@timestamp"] = common.Time(time.Now())
} else {
millisec := msg.TimeUnix - float64(int64(msg.TimeUnix))
ms := fmt.Sprintf("%.4f", millisec)
msf, err := strconv.ParseFloat(ms, 64)
if err != nil {
event["@timestamp"] = common.Time(time.Now())
} else {
event["@timestamp"] = common.Time(time.Unix(int64(msg.TimeUnix), int64(msf)*1000000))
}
}
event["level"] = msg.Level
event["facility"] = msg.Facility
ll.logEntriesRecieved <- event
}