forked from TrueCloudLab/distribution
129 lines
4.1 KiB
Go
129 lines
4.1 KiB
Go
package logrus_logstash
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import (
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"net"
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"strings"
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"github.com/Sirupsen/logrus"
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)
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// Hook represents a connection to a Logstash instance
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type Hook struct {
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conn net.Conn
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appName string
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alwaysSentFields logrus.Fields
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hookOnlyPrefix string
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}
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// NewHook creates a new hook to a Logstash instance, which listens on
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// `protocol`://`address`.
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func NewHook(protocol, address, appName string) (*Hook, error) {
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return NewHookWithFields(protocol, address, appName, make(logrus.Fields))
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}
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// NewHookWithConn creates a new hook to a Logstash instance, using the supplied connection
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func NewHookWithConn(conn net.Conn, appName string) (*Hook, error) {
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return NewHookWithFieldsAndConn(conn, appName, make(logrus.Fields))
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}
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// NewHookWithFields creates a new hook to a Logstash instance, which listens on
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// `protocol`://`address`. alwaysSentFields will be sent with every log entry.
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func NewHookWithFields(protocol, address, appName string, alwaysSentFields logrus.Fields) (*Hook, error) {
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return NewHookWithFieldsAndPrefix(protocol, address, appName, alwaysSentFields, "")
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}
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// NewHookWithFieldsAndPrefix creates a new hook to a Logstash instance, which listens on
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// `protocol`://`address`. alwaysSentFields will be sent with every log entry. prefix is used to select fields to filter
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func NewHookWithFieldsAndPrefix(protocol, address, appName string, alwaysSentFields logrus.Fields, prefix string) (*Hook, error) {
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conn, err := net.Dial(protocol, address)
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if err != nil {
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return nil, err
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}
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return NewHookWithFieldsAndConnAndPrefix(conn, appName, alwaysSentFields, prefix)
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}
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// NewHookWithFieldsAndConn creates a new hook to a Logstash instance using the supplied connection
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func NewHookWithFieldsAndConn(conn net.Conn, appName string, alwaysSentFields logrus.Fields) (*Hook, error) {
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return NewHookWithFieldsAndConnAndPrefix(conn, appName, alwaysSentFields, "")
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}
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//NewHookWithFieldsAndConnAndPrefix creates a new hook to a Logstash instance using the suppolied connection and prefix
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func NewHookWithFieldsAndConnAndPrefix(conn net.Conn, appName string, alwaysSentFields logrus.Fields, prefix string) (*Hook, error) {
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return &Hook{conn: conn, appName: appName, alwaysSentFields: alwaysSentFields, hookOnlyPrefix: prefix}, nil
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}
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//NewFilterHook makes a new hook which does not forward to logstash, but simply enforces the prefix rules
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func NewFilterHook() *Hook {
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return NewFilterHookWithPrefix("")
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}
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//NewFilterHookWithPrefix make a new hook which does not forward to logstash, but simply enforces the specified prefix
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func NewFilterHookWithPrefix(prefix string) *Hook {
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return &Hook{conn: nil, appName: "", alwaysSentFields: make(logrus.Fields), hookOnlyPrefix: prefix}
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}
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func (h *Hook) filterHookOnly(entry *logrus.Entry) {
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if h.hookOnlyPrefix != "" {
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for key := range entry.Data {
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if strings.HasPrefix(key, h.hookOnlyPrefix) {
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delete(entry.Data, key)
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}
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}
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}
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}
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//WithPrefix sets a prefix filter to use in all subsequent logging
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func (h *Hook) WithPrefix(prefix string) {
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h.hookOnlyPrefix = prefix
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}
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func (h *Hook) WithField(key string, value interface{}) {
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h.alwaysSentFields[key] = value
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}
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func (h *Hook) WithFields(fields logrus.Fields) {
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//Add all the new fields to the 'alwaysSentFields', possibly overwriting exising fields
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for key, value := range fields {
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h.alwaysSentFields[key] = value
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}
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}
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func (h *Hook) Fire(entry *logrus.Entry) error {
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//make sure we always clear the hookonly fields from the entry
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defer h.filterHookOnly(entry)
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// Add in the alwaysSentFields. We don't override fields that are already set.
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for k, v := range h.alwaysSentFields {
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if _, inMap := entry.Data[k]; !inMap {
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entry.Data[k] = v
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}
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}
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//For a filteringHook, stop here
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if h.conn == nil {
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return nil
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}
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formatter := LogstashFormatter{Type: h.appName}
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dataBytes, err := formatter.FormatWithPrefix(entry, h.hookOnlyPrefix)
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if err != nil {
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return err
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}
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if _, err = h.conn.Write(dataBytes); err != nil {
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return err
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}
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return nil
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}
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func (h *Hook) Levels() []logrus.Level {
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return []logrus.Level{
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logrus.PanicLevel,
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logrus.FatalLevel,
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logrus.ErrorLevel,
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logrus.WarnLevel,
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logrus.InfoLevel,
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logrus.DebugLevel,
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}
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}
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