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persistence.go
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persistence.go
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package tlsaudit
import (
"bytes"
"encoding/gob"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
"time"
"github.com/adedayo/tlsaudit/pkg/model"
"github.com/dgraph-io/badger"
)
var (
dayFormat = "2006-01-02"
baseScanDBDirectory = filepath.FromSlash("data/tlsaudit/scan")
)
//ListScans returns the ScanID list of persisted scans
func ListScans(rewindDays int) (result []tlsmodel.ScanRequest) {
if rewindDays < 0 {
log.Print("The number of days in the past must be non-negative.")
return
}
dirs, err := ioutil.ReadDir(baseScanDBDirectory)
if err != nil {
log.Print(err)
return
}
allowedDates := make(map[string]bool)
today := time.Now()
for d := rewindDays; d >= 0; d-- {
allowedDates[fmt.Sprintf("%s", today.AddDate(0, 0, -1*d).Format(dayFormat))] = true
}
matchedDirs := []string{}
for _, d := range dirs {
dirName := d.Name()
if _, present := allowedDates[dirName]; present {
matchedDirs = append(matchedDirs, dirName)
}
}
for _, d := range matchedDirs {
dirs, err := ioutil.ReadDir(filepath.Join(baseScanDBDirectory, d))
if err != nil {
log.Print(err)
return
}
for _, sID := range dirs {
scanID := sID.Name()
//LoadScanRequest retrieves persisted scan request from folder following a layout pattern
if psr, err := LoadScanRequest(d, scanID); err == nil {
result = append(result, psr.Request)
}
}
}
return
}
//StreamScan streams the result to a callback function
func StreamScan(day, scanID string, callback func(progress, total int, results []tlsmodel.HumanScanResult)) {
if psr, err := LoadScanRequest(day, scanID); err == nil {
tot := psr.Progress
streamExistingResult(psr, func(progress int, results []tlsmodel.ScanResult, narrative string) {
callback(progress, tot, humanise(results))
})
}
}
func humanise(in []tlsmodel.ScanResult) (out []tlsmodel.HumanScanResult) {
for _, r := range in {
out = append(out, r.ToStringStruct())
}
return
}
//StreamExistingResult sends data via a callback function
func streamExistingResult(psr tlsmodel.PersistedScanRequest,
callback func(progress int, result []tlsmodel.ScanResult, narrative string)) {
opts := badger.DefaultOptions
opts.Dir = filepath.Join(baseScanDBDirectory, psr.Request.Day, psr.Request.ScanID)
opts.ValueDir = filepath.Join(baseScanDBDirectory, psr.Request.Day, psr.Request.ScanID)
db, err := badger.Open(opts)
if err != nil {
log.Fatal(err)
return
}
defer db.Close()
hostResults := make(map[string][]tlsmodel.ScanResult)
total := len(psr.Hosts)
position := 0
db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.PrefetchSize = 100
it := txn.NewIterator(opts)
defer it.Close()
for it.Rewind(); it.Valid(); it.Next() {
item := it.Item()
host := string(item.Key())
if _, present := hostResults[host]; !present {
res, err := item.ValueCopy(nil)
if err != nil {
return err
}
result, err := tlsmodel.UnmarsharlScanResult(res)
if err != nil {
return err
}
position++
narrative := fmt.Sprintf("Finished scan of %s. Progress %f%% %d hosts of a total of %d in %f seconds\n",
host, 100*float32(position)/float32(total), position, total, time.Since(psr.ScanStart).Seconds())
callback(position, result, narrative)
}
}
return nil
})
}
//PersistScans persists the result of scans per server
func PersistScans(psr tlsmodel.PersistedScanRequest, server string, scans []tlsmodel.ScanResult) {
opts := badger.DefaultOptions
opts.Dir = filepath.Join(baseScanDBDirectory, psr.Request.Day, psr.Request.ScanID)
opts.ValueDir = filepath.Join(baseScanDBDirectory, psr.Request.Day, psr.Request.ScanID)
opts.NumVersionsToKeep = 0
db, err := badger.Open(opts)
if err != nil {
log.Fatal(err)
return
}
defer db.Close()
db.Update(func(txn *badger.Txn) error {
return txn.Set([]byte(server), marshallScanResults(scans))
})
}
//LoadScanRequest retrieves persisted scan request from folder following a layout pattern
func LoadScanRequest(dir, scanID string) (psr tlsmodel.PersistedScanRequest, e error) {
opts := badger.DefaultOptions
opts.Dir = filepath.Join(baseScanDBDirectory, dir, scanID, "request")
opts.ValueDir = filepath.Join(baseScanDBDirectory, dir, scanID, "request")
db, err := badger.Open(opts)
if err != nil {
log.Fatal(err)
return
}
defer db.Close()
data := []byte{}
outErr := db.View(func(txn *badger.Txn) error {
item, err := txn.Get([]byte(scanID))
if err != nil {
return err
}
data, err = item.ValueCopy(nil)
if err != nil {
return err
}
return nil
})
if outErr != nil {
return psr, outErr
}
return tlsmodel.UnmasharlPersistedScanRequest(data)
}
//arshallScanResults marshalls scan results
func marshallScanResults(s []tlsmodel.ScanResult) []byte {
result := bytes.Buffer{}
gob.Register([]tlsmodel.ScanResult{})
err := gob.NewEncoder(&result).Encode(&s)
if err != nil {
log.Print(err)
}
return result.Bytes()
}
//PersistScanRequest persists scan requesr
func PersistScanRequest(psr tlsmodel.PersistedScanRequest) {
opts := badger.DefaultOptions
opts.Dir = filepath.Join(baseScanDBDirectory, psr.Request.Day, psr.Request.ScanID, "request")
opts.ValueDir = filepath.Join(baseScanDBDirectory, psr.Request.Day, psr.Request.ScanID, "request")
opts.NumVersionsToKeep = 0
db, err := badger.Open(opts)
if err != nil {
log.Fatal(err)
return
}
defer db.Close()
db.Update(func(txn *badger.Txn) error {
return txn.Set([]byte(psr.Request.ScanID), psr.Marshall())
})
if psr.Progress%10 == 0 { //compact DB every 10 run
lsmx, vlogx := db.Size()
for db.RunValueLogGC(.8) == nil {
lsmy, vlogy := db.Size()
println("Compacted DB")
fmt.Printf("Before LSM: %d, VLOG: %d, After LSM: %d, VLOG: %d\n", lsmx, vlogx, lsmy, vlogy)
lsmx, vlogx = lsmy, vlogy
}
}
}
//CompactDB reclaims space by pruning the database
func CompactDB(dayPath, scanID string) {
//compact the scan requests
opts := badger.DefaultOptions
opts.Dir = filepath.Join(baseScanDBDirectory, dayPath, scanID, "request")
opts.ValueDir = filepath.Join(baseScanDBDirectory, dayPath, scanID, "request")
opts.NumVersionsToKeep = 0
db, err := badger.Open(opts)
if err != nil {
println(err.Error())
log.Fatal(err)
return
}
lsmx, vlogx := db.Size()
for db.RunValueLogGC(.8) == nil {
lsmy, vlogy := db.Size()
println("Compacted DB", opts.Dir)
fmt.Printf("Before LSM: %d, VLOG: %d, After LSM: %d, VLOG: %d\n", lsmx, vlogx, lsmy, vlogy)
lsmx, vlogx = lsmy, vlogy
}
db.Close()
//compact the scan results
opts.Dir = filepath.Join(baseScanDBDirectory, dayPath, scanID)
opts.ValueDir = filepath.Join(baseScanDBDirectory, dayPath, scanID)
db, err = badger.Open(opts)
if err != nil {
println(err.Error())
log.Fatal(err)
return
}
lsmx, vlogx = db.Size()
for db.RunValueLogGC(.8) == nil {
lsmy, vlogy := db.Size()
println("Compacted DB", opts.Dir)
fmt.Printf("Before LSM: %d, VLOG: %d, After LSM: %d, VLOG: %d\n", lsmx, vlogx, lsmy, vlogy)
lsmx, vlogx = lsmy, vlogy
}
db.Close()
}
//GetNextScanID returns the next unique scan ID
func GetNextScanID() string {
prefix := filepath.Join(baseScanDBDirectory, time.Now().Format(dayFormat))
if _, err := os.Stat(prefix); os.IsNotExist(err) {
if err2 := os.MkdirAll(prefix, 0755); err2 != nil {
log.Fatal("Could not create the path ", prefix)
}
}
dir, err := ioutil.TempDir(prefix, "")
if err != nil {
log.Fatal(err)
return ""
}
return strings.Replace(strings.TrimPrefix(dir, prefix), string(os.PathSeparator), "", -1)
}