/
gzipbeat.go
197 lines (170 loc) · 4.87 KB
/
gzipbeat.go
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package main
import (
"bufio"
"fmt"
"compress/gzip"
"io/ioutil"
"time"
"os"
"path/filepath"
"github.com/elastic/libbeat/beat"
"github.com/elastic/libbeat/cfgfile"
"github.com/elastic/libbeat/common"
"github.com/elastic/libbeat/logp"
"github.com/elastic/libbeat/publisher"
)
// Gzipbeat implements Beater interface and sends Nginx status using libbeat.
type Gzipbeat struct {
// Holds configuration of gzipbeat parsed by libbeat.
config ConfigSettings
// Beat client.
events publisher.Client
// Local machine hostname.
hostname string
// List of files that were sent successfully.
registry []string
}
// Config Gzipbeat according to gzipbeat.yml.
func (gb *Gzipbeat) Config(b *beat.Beat) error {
err := cfgfile.Read(&gb.config, "")
if err != nil {
logp.Err("Error reading configuration file: %v", err)
return err
}
return nil
}
// Setup Gzipbeat.
func (gb *Gzipbeat) Setup(b *beat.Beat) error {
gb.events = b.Events
// read registry if file exists
_, err := os.Stat(gb.config.Registry)
if err == nil || os.IsExist(err) {
// read content
rr, err := os.Open(gb.config.Registry)
if err != nil {
logp.Err("Error opening registry file: %v", err)
return err
}
defer rr.Close()
scanner := bufio.NewScanner(rr)
for scanner.Scan() {
gb.registry = append(gb.registry, scanner.Text())
}
err = scanner.Err()
if err != nil {
logp.Err("Error scanning registry file: %v", err)
return err
}
}
// get hostname to be later used in events
hostname, err := os.Hostname()
if err != nil {
logp.Err("Error getting hostname: %v", err)
return err
}
gb.hostname = hostname
return nil
}
// Cleanup Gzipbeat.
func (gb *Gzipbeat) Cleanup(b *beat.Beat) error {
return nil
}
// Stop Gzipbeat.
func (gb *Gzipbeat) Stop() {
}
// Sends a single logfile, returns false if we should retry
func send(gb *Gzipbeat, filename string, fields *map[string]string) {
// check if we have access to file
fi, err := os.Open(filename)
if err != nil {
logp.Err("Error opening file %s: %v", filename, err)
return
}
defer fi.Close()
// gunzip content
fz, err := gzip.NewReader(fi)
if err != nil {
logp.Err("Error gunzipping file %s: %v", filename, err)
return
}
defer fz.Close()
content, err := ioutil.ReadAll(fz)
if err != nil {
logp.Err("Error reading file %s: %v", filename, err)
return
}
// publish new event
event := common.MapStr{
"@timestamp": common.Time(time.Now()),
"type": "gzipfile",
"file": filename,
"content": string(content),
"host": gb.hostname,
}
if fields != nil {
for name,val := range *fields {
event[name] = val
}
}
gb.events.PublishEvent(event, publisher.Sync)
}
// Saves to (mem & disk) registry that we processed single logfile
func saveToRegistry(gb *Gzipbeat, filename string) error {
ra, err := os.OpenFile(gb.config.Registry, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0666)
if err != nil {
logp.Err("Error opening registry file: %v", err)
return err
}
defer ra.Close()
_, err = fmt.Fprintln(ra, filename)
return err
}
// Run Gzipbeat.
func (gb *Gzipbeat) Run(b *beat.Beat) error {
// iterate through each config section
for _,input := range gb.config.Input {
// list all gzip files in directory
gzips, _ := filepath.Glob(input.Path)
if input.Exclude != "" {
exclude, _ := filepath.Glob(input.Exclude)
gzips = diff(gzips, exclude)
}
gzips = diff(gzips, gb.registry)
// do 1 file at the time
for _,filename := range gzips {
send(gb, filename, &input.Fields)
err := saveToRegistry(gb, filename)
if err != nil {
logp.Err("Error saving to registry file %s: %v", gb.config.Registry, err)
return err
}
}
}
return nil
}
// Go doesn't have a diff function
func diff(slice1 []string, slice2 []string) []string {
var diff []string
// Loop two times, first to find slice1 strings not in slice2,
// second loop to find slice2 strings not in slice1
for i := 0; i < 2; i++ {
for _, s1 := range slice1 {
found := false
for _, s2 := range slice2 {
if s1 == s2 {
found = true
break
}
}
// String not found. We add it to return slice
if !found {
diff = append(diff, s1)
}
}
// Swap the slices, only if it was the first loop
if i == 0 {
slice1, slice2 = slice2, slice1
}
}
return diff
}