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forwarder.go
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forwarder.go
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package log
import (
"encoding/json"
"fmt"
"net/url"
"path"
"strconv"
"strings"
"time"
"github.com/bshuster-repo/logrus-logstash-hook"
"github.com/evalphobia/logrus_fluent"
"github.com/sirupsen/logrus"
)
const (
HookVendorFluentd = "fluentd"
HookVendorLogstash = "logstash"
)
type ForwarderConfig struct {
Vendor string `json:"vendor"`
Address string `json:"address"`
Level string `json:"level"`
Name string `json:"name"`
TimeFormat string `json:"time_format,omitempty"`
Options map[string]interface{} `json:"options,omitempty"`
}
func (c *ForwarderConfig) UnmarshalByOptions(v interface{}) error {
if len(c.Options) > 0 {
b, err := json.Marshal(c.Options)
if err != nil {
return err
}
if err := json.Unmarshal(b, v); err != nil {
return err
}
}
return nil
}
func (c *ForwarderConfig) NetworkAndHostPort(defaultNet string) (network string, hostPort string, err error) {
addr := c.Address
if strings.Index(addr, "://") < 0 {
addr = defaultNet + "://" + addr
}
fmt.Println(c.Address)
var u *url.URL
u, err = url.Parse(addr)
if err != nil {
return
}
hostPort = u.Host
if hostPort == "" {
err = fmt.Errorf("not exists hostPort value")
return
}
network = u.Scheme
if network == "unix" {
err = fmt.Errorf("invalid network")
return
}
return network, u.Host, nil
}
func parseHostPort(hostPort string) (string, int) {
idx := strings.Index(hostPort, ":")
if idx > 0 {
port, _ := strconv.Atoi(hostPort[idx+1:])
return hostPort[:idx], port
}
return hostPort, 0
}
func (c *ForwarderConfig) HookLevels() ([]logrus.Level, error) {
lv, err := ParseLevel(c.Level)
if err != nil {
return nil, err
}
lvs := make([]logrus.Level, 0)
switch lv {
case TraceLevel:
lvs = append(lvs, logrus.TraceLevel)
fallthrough
case DebugLevel:
lvs = append(lvs, logrus.DebugLevel)
fallthrough
case InfoLevel:
lvs = append(lvs, logrus.InfoLevel)
fallthrough
case WarnLevel:
lvs = append(lvs, logrus.WarnLevel)
fallthrough
case ErrorLevel:
lvs = append(lvs, logrus.ErrorLevel)
fallthrough
case FatalLevel:
lvs = append(lvs, logrus.FatalLevel)
fallthrough
case PanicLevel:
lvs = append(lvs, logrus.PanicLevel)
}
return lvs, nil
}
type HookWrapper struct {
h logrus.Hook
lvs []logrus.Level
c *ForwarderConfig
}
func (h *HookWrapper) Levels() []logrus.Level {
return h.lvs
}
func (h *HookWrapper) Fire(e *logrus.Entry) error {
d := e.Data
defer func() {
e.Data = d
}()
e.Data = make(map[string]interface{}, len(d)+2)
for k, v := range d {
e.Data[k] = v
}
e.Data["logtime"] = e.Time.UnixNano()
var hasModule bool
if e.Caller != nil {
if _, hasModule = e.Data[FieldKeyModule]; !hasModule {
e.Data[FieldKeyModule] = getPackageName(e.Caller.Function)
}
e.Data["src"] = fmt.Sprintf("%s:%d", path.Base(e.Caller.File), e.Caller.Line)
}
err := h.h.Fire(e)
return err
}
type HookCreater func(c *ForwarderConfig) (logrus.Hook, error)
func AddForwarder(c *ForwarderConfig) error {
if c.Level == "" {
c.Level = "info"
}
if c.Name == "" {
c.Name = "goloop"
}
if c.TimeFormat == "" {
c.TimeFormat = time.RFC3339Nano
}
var h logrus.Hook
var err error
switch c.Vendor {
case HookVendorFluentd:
h, err = newHook(c, fluentHookCreater)
case HookVendorLogstash:
h, err = newHook(c, logstashHookCreater)
default:
return fmt.Errorf("not supported forwarder %s", c.Vendor)
}
if err != nil {
return err
}
globalLogger.addHook(h)
return nil
}
func newHook(c *ForwarderConfig, f HookCreater) (logrus.Hook, error) {
if c == nil || f == nil {
return nil, fmt.Errorf("arguments cannot be nil")
}
lvs, err := c.HookLevels()
if err != nil {
return nil, err
}
h, err := f(c)
if err != nil {
return nil, err
}
return &HookWrapper{h, lvs, c}, nil
}
func fluentHookCreater(c *ForwarderConfig) (logrus.Hook, error) {
network, hostPort, err := c.NetworkAndHostPort("tcp")
if err != nil {
return nil, err
}
host, port := parseHostPort(hostPort)
lvs, err := c.HookLevels()
if err != nil {
return nil, err
}
opt := struct {
Timeout time.Duration `json:"timeout"`
WriteTimeout time.Duration `json:"write_timeout"`
RetryWait int `json:"retry_wait"`
MaxRetry int `json:"max_retry"`
}{
//default values from https://github.com/fluent/fluent-logger-golang/blob/master/fluent/fluent.go
Timeout: 3 * time.Second,
WriteTimeout: time.Duration(0), // Write() will not time out
RetryWait: 500,
MaxRetry: 13,
}
if err = c.UnmarshalByOptions(&opt); err != nil {
return nil, err
}
fc := logrus_fluent.Config{
DefaultTag: c.Name,
FluentNetwork: network,
Host: host,
Port: port,
LogLevels: lvs,
Timeout: opt.Timeout,
WriteTimeout: opt.WriteTimeout,
RetryWait: opt.RetryWait,
MaxRetry: opt.MaxRetry,
//Default
DefaultMessageField: "message",
SubSecondPrecision: true,
}
return logrus_fluent.NewWithConfig(fc)
}
func logstashHookCreater(c *ForwarderConfig) (logrus.Hook, error) {
network, hostPort, err := c.NetworkAndHostPort("tcp")
if err != nil {
return nil, err
}
if h, err := logrustash.NewHook(network, hostPort, c.Name); err != nil {
return nil, err
} else {
h.TimeFormat = c.TimeFormat
return h, nil
}
}