/usr/share/gocode/src/github.com/bshuster-repo/logrus-logstash-hook/logstash.go is in golang-github-bshuster-repo-logrus-logstash-hook-dev 0.0~git20170102.0.5f729f2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | package logrus_logstash
import (
"net"
"strings"
"github.com/Sirupsen/logrus"
)
// Hook represents a connection to a Logstash instance
type Hook struct {
conn net.Conn
appName string
alwaysSentFields logrus.Fields
hookOnlyPrefix string
}
// NewHook creates a new hook to a Logstash instance, which listens on
// `protocol`://`address`.
func NewHook(protocol, address, appName string) (*Hook, error) {
return NewHookWithFields(protocol, address, appName, make(logrus.Fields))
}
// NewHookWithConn creates a new hook to a Logstash instance, using the supplied connection
func NewHookWithConn(conn net.Conn, appName string) (*Hook, error) {
return NewHookWithFieldsAndConn(conn, appName, make(logrus.Fields))
}
// NewHookWithFields creates a new hook to a Logstash instance, which listens on
// `protocol`://`address`. alwaysSentFields will be sent with every log entry.
func NewHookWithFields(protocol, address, appName string, alwaysSentFields logrus.Fields) (*Hook, error) {
return NewHookWithFieldsAndPrefix(protocol, address, appName, alwaysSentFields, "")
}
// NewHookWithFieldsAndPrefix creates a new hook to a Logstash instance, which listens on
// `protocol`://`address`. alwaysSentFields will be sent with every log entry. prefix is used to select fields to filter
func NewHookWithFieldsAndPrefix(protocol, address, appName string, alwaysSentFields logrus.Fields, prefix string) (*Hook, error) {
conn, err := net.Dial(protocol, address)
if err != nil {
return nil, err
}
return NewHookWithFieldsAndConnAndPrefix(conn, appName, alwaysSentFields, prefix)
}
// NewHookWithFieldsAndConn creates a new hook to a Logstash instance using the supplied connection
func NewHookWithFieldsAndConn(conn net.Conn, appName string, alwaysSentFields logrus.Fields) (*Hook, error) {
return NewHookWithFieldsAndConnAndPrefix(conn, appName, alwaysSentFields, "")
}
//NewHookWithFieldsAndConnAndPrefix creates a new hook to a Logstash instance using the suppolied connection and prefix
func NewHookWithFieldsAndConnAndPrefix(conn net.Conn, appName string, alwaysSentFields logrus.Fields, prefix string) (*Hook, error) {
return &Hook{conn: conn, appName: appName, alwaysSentFields: alwaysSentFields, hookOnlyPrefix: prefix}, nil
}
//NewFilterHook makes a new hook which does not forward to logstash, but simply enforces the prefix rules
func NewFilterHook() *Hook {
return NewFilterHookWithPrefix("")
}
//NewFilterHookWithPrefix make a new hook which does not forward to logstash, but simply enforces the specified prefix
func NewFilterHookWithPrefix(prefix string) *Hook {
return &Hook{conn: nil, appName: "", alwaysSentFields: make(logrus.Fields), hookOnlyPrefix: prefix}
}
func (h *Hook) filterHookOnly(entry *logrus.Entry) {
if h.hookOnlyPrefix != "" {
for key := range entry.Data {
if strings.HasPrefix(key, h.hookOnlyPrefix) {
delete(entry.Data, key)
}
}
}
}
//WithPrefix sets a prefix filter to use in all subsequent logging
func (h *Hook) WithPrefix(prefix string) {
h.hookOnlyPrefix = prefix
}
func (h *Hook) WithField(key string, value interface{}) {
h.alwaysSentFields[key] = value
}
func (h *Hook) WithFields(fields logrus.Fields) {
//Add all the new fields to the 'alwaysSentFields', possibly overwriting exising fields
for key, value := range fields {
h.alwaysSentFields[key] = value
}
}
func (h *Hook) Fire(entry *logrus.Entry) error {
//make sure we always clear the hookonly fields from the entry
defer h.filterHookOnly(entry)
// Add in the alwaysSentFields. We don't override fields that are already set.
for k, v := range h.alwaysSentFields {
if _, inMap := entry.Data[k]; !inMap {
entry.Data[k] = v
}
}
//For a filteringHook, stop here
if h.conn == nil {
return nil
}
formatter := LogstashFormatter{Type: h.appName}
dataBytes, err := formatter.FormatWithPrefix(entry, h.hookOnlyPrefix)
if err != nil {
return err
}
if _, err = h.conn.Write(dataBytes); err != nil {
return err
}
return nil
}
func (h *Hook) Levels() []logrus.Level {
return []logrus.Level{
logrus.PanicLevel,
logrus.FatalLevel,
logrus.ErrorLevel,
logrus.WarnLevel,
logrus.InfoLevel,
logrus.DebugLevel,
}
}
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