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backup.go
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backup.go
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package client
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"sort"
"github.com/axllent/myback/logger"
"github.com/klauspost/compress/zstd"
)
var (
// a lookup array for databases to ignore
onlySlice = []*regexp.Regexp{}
// a lookup array for databases to ignore
ignoreSlice = []*regexp.Regexp{}
// a lookup array for tables to skip data
nodataSlice = []*regexp.Regexp{}
)
// Backup will perform the backup
func Backup() []error {
synced := make(map[string][]string)
errors := []error{}
// make sure repo directory exists
if _, err := os.Stat(Config.Repo); os.IsNotExist(err) {
logger.Log().Infof("Creating repo directory: %s", Config.Repo)
err := os.MkdirAll(Config.Repo, os.ModePerm)
if err != nil {
errors = append(errors, fmt.Errorf("cannot create repo directory: %s", Config.Repo))
return errors
}
}
logger.Log().Debugf("Fetching list of databases from %s", Config.URL)
dbresponse, err := getFile(Config.URL + "/db")
if err != nil {
errors = append(errors, fmt.Errorf("error: %s", err))
return errors
}
var jsondbs = []GHMDDatabase{}
err = json.Unmarshal(dbresponse, &jsondbs)
if err != nil {
errors = append(errors, fmt.Errorf("unexpected result from %s: %s", Config.URL+"/db", err))
return errors
}
for _, database := range jsondbs {
if len(onlySlice) > 0 && !inRegexpArray(database.Name, onlySlice) {
logger.Log().Debugf("Skipping database: %s", database.Name)
continue
}
if inRegexpArray(database.Name, ignoreSlice) {
logger.Log().Debugf("Skipping database: %s", database.Name)
continue
}
if inArray(database.Name, Config.Ignore) {
// skip database
continue
}
// ensure database directory exists
dbdir := filepath.Join(Config.Repo, database.Name)
if _, err := os.Stat(dbdir); os.IsNotExist(err) {
err := os.MkdirAll(dbdir, os.ModePerm)
if err != nil {
errors = append(errors, fmt.Errorf("cannot create database directory: %s", dbdir))
continue
}
}
tables, err := dumpModifiedTables(database.Name, dbdir)
if err != nil {
errors = append(errors, err)
continue
}
synced[database.Name] = tables
}
if len(errors) > 0 {
errors = append(errors, fmt.Errorf("%d errors encountered, skipping deletion", len(errors)))
} else {
deleteOldData(Config.Repo, synced)
}
return errors
}
// DumpModifiedTables dumps only changed tables
func dumpModifiedTables(database string, dbdir string) ([]string, error) {
var db = Database{}
var tables []string
dbresponse, err := getFile(Config.URL + "/db/" + database)
if err != nil {
return tables, err
}
if err := json.Unmarshal(dbresponse, &db); err != nil {
logger.Log().Fatalf("Unexpected result from %s: %s", Config.URL+"/db"+database, err)
return tables, err
}
ext := ".sql"
if Config.Compress {
ext = ext + ".zst"
}
dbFilename := fmt.Sprintf("database-%s%s", hashString(db.Create), ext)
dbfile := filepath.Join(dbdir, dbFilename)
if !isFile(dbfile) {
f, err := os.Create(dbfile)
if err != nil {
logger.Log().Fatalf("Error writing %s: %s", dbfile, err)
return tables, err
}
if Config.Compress {
w, err := zstd.NewWriter(f, zstd.WithEncoderLevel(zstd.SpeedBestCompression))
if err != nil {
return tables, err
}
if _, err := w.Write([]byte(db.Create)); err != nil {
return tables, err
}
if err := w.Close(); err != nil {
return tables, err
}
} else {
_, err = f.WriteString(db.Create)
if err != nil {
logger.Log().Fatalf("Error writing %s: %s", dbfile, err)
err := f.Close()
return tables, err
}
}
if err := f.Close(); err != nil {
return tables, err
}
}
// add DB to list of files
tables = append(tables, dbFilename)
for _, table := range db.Tables {
// Optional dump parameters
queryParams := make(map[string]string)
// lookup name
lookupName := fmt.Sprintf("%s.%s", database, table.Name)
if inRegexpArray(lookupName, ignoreSlice) {
logger.Log().Debugf("Skipping table: %s", lookupName)
continue
}
if inRegexpArray(lookupName, nodataSlice) {
logger.Log().Debugf("Skipping data: %s", lookupName)
table.Checksum = 0
queryParams["no-data"] = "1"
}
// selective where?
if where, ok := Config.WhereMap[lookupName]; ok {
queryParams["where"] = where
}
// maps are not guaranteed to be the same from one iteration to the next
// so multiple queries can result in different results
keys := make([]string, 0, len(queryParams))
for k := range queryParams {
keys = append(keys, k)
}
sort.Strings(keys)
paramsStr := ""
for _, k := range keys {
paramsStr = fmt.Sprintf("%s[%s=%s]", paramsStr, k, queryParams[k])
}
// Check the table is not ignored
// generate the table name
ext := ".sql"
if Config.Compress {
ext = ext + ".zst"
}
tblFilename := fmt.Sprintf("t-%s-%d-%s%s", table.Name, table.Checksum, hashString(table.Create+paramsStr), ext)
tables = append(tables, tblFilename)
tblSave := filepath.Join(dbdir, tblFilename)
if !isFile(tblSave) {
err := downloadToFile(Config.URL+"/dump/"+database+"/"+table.Name, queryParams, tblSave)
if err != nil {
logger.Log().Errorf("Unable to download %s/%s: %s", database, table.Name, err.Error())
} else {
logger.Log().Infof("Saved %s/%s", database, tblFilename)
}
}
}
return tables, nil
}
// DeleteOldData deletes old databases and files
func deleteOldData(repo string, tables map[string][]string) {
directories, err := ioutil.ReadDir(repo)
if err != nil {
logger.Log().Fatalf("Error reading %s: %s", repo, err)
return
}
for _, dir := range directories {
dbdir := filepath.Join(repo, dir.Name())
tables, ok := tables[dir.Name()]
if !ok {
logger.Log().Infof("Deleted database: %s", dbdir)
err := os.RemoveAll(dbdir)
if err != nil {
logger.Log().Fatalf("Error deleting %s: %s", dbdir, err)
}
continue
}
// list files inside of database directory
files, err := ioutil.ReadDir(dbdir)
if err != nil {
logger.Log().Fatalf("Unexpected result from %s", err)
return
}
for _, file := range files {
if !inArray(file.Name(), tables) {
delFile := filepath.Join(dbdir, file.Name())
err := os.RemoveAll(delFile)
if err != nil {
logger.Log().Fatalf("Error deleting %s: %s", delFile, err)
return
}
logger.Log().Infof("Deleted: %s/%s", dir.Name(), file.Name())
}
}
}
}