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main.go
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package main
/**
* A utility for doing operations on s3 faster than s3cmd
*/
import (
"bufio"
"bytes"
"compress/gzip"
"fmt"
"io/ioutil"
"log"
"os"
"os/user"
"path"
"regexp"
"runtime"
"strings"
"sync"
"github.com/AdRoll/goamz/aws"
"github.com/AdRoll/goamz/s3"
"github.com/TuneOSS/fasts3/awswrapper"
"github.com/TuneOSS/fasts3/s3wrapper"
"github.com/alecthomas/kingpin"
"github.com/dustin/go-humanize"
)
type s3List []string
// Set overrides kingping's Set method to validate value for s3 URIs
func (s *s3List) Set(value string) error {
hasMatch, err := regexp.MatchString("^s3://", value)
if err != nil {
return err
}
if !hasMatch {
return fmt.Errorf("%s not a valid S3 uri, Please enter a valid S3 uri. Ex: s3://mary/had/a/little/lamb\n", *lsS3Uri)
} else {
*s = append(*s, value)
return nil
}
}
func (s *s3List) String() string {
return ""
}
// IsCumulative specifies S3List as a cumulative argument
func (s *s3List) IsCumulative() bool {
return true
}
// S3List creates a new S3List kingpin setting
func S3List(s kingpin.Settings) (target *[]string) {
target = new([]string)
s.SetValue((*s3List)(target))
return
}
var (
app = kingpin.New("fasts3", "Multi-threaded s3 utility")
ls = app.Command("ls", "List s3 prefixes.")
lsS3Uri = ls.Arg("s3uri", "paritial s3 uri to list, ex: s3://mary/had/a/little/lamb/").Required().String()
lsRecurse = ls.Flag("recursive", "Get all keys for this prefix.").Short('r').Bool()
lsSearchDepth = ls.Flag("search-depth", "search depth to search for work.").Default("0").Int()
humanReadable = ls.Flag("human-readable", "human readable key size.").Short('H').Bool()
withDate = ls.Flag("with-date", "include the last modified date.").Short('d').Bool()
del = app.Command("del", "Delete s3 keys")
delPrefixes = S3List(del.Arg("prefixes", "1 or more partial s3 uris to delete delimited by space"))
delRecurse = del.Flag("recursive", "Delete all keys with prefix").Short('r').Bool()
delSearchDepth = del.Flag("search-depth", "search depth to search for work.").Default("0").Int()
get = app.Command("get", "Fetch files from s3")
getS3Uris = S3List(get.Arg("prefixes", "list of prefixes or s3Uris to retrieve"))
getSearchDepth = get.Flag("search-depth", "search depth to search for work.").Default("0").Int()
stream = app.Command("stream", "Stream s3 files to stdout")
streamS3Uris = S3List(stream.Arg("prefixes", "list of prefixes or s3Uris to retrieve"))
streamSearchDepth = stream.Flag("search-depth", "search depth to search for work.").Default("0").Int()
streamKeyRegex = stream.Flag("key-regex", "regex filter for keys").Default("").String()
streamIncludeKeyName = stream.Flag("include-key-name", "regex filter for keys").Bool()
initApp = app.Command("init", "Initialize .fs3cfg file in home directory")
)
// parseS3Uri parses a s3 uri into it's bucket and prefix
func parseS3Uri(s3Uri string) (bucket string, prefix string) {
s3UriParts := strings.Split(s3Uri, "/")
prefix = strings.Join(s3UriParts[3:], "/")
bucket = s3UriParts[2]
return
}
// GetBucket builds a s3 connection retrieving the bucket
func GetBucket(bucket string) *s3.Bucket {
auth, err := awswrapper.GetAwsAuth()
if err != nil {
log.Fatalln(err)
}
b := s3.New(auth, aws.USEast).Bucket(bucket)
loc, err := b.Location()
if err != nil {
log.Fatalln(err)
}
if aws.GetRegion(loc) != aws.USEast {
b = s3.New(auth, aws.GetRegion(loc)).Bucket(bucket)
}
return b
}
// Ls lists directorys or keys under a prefix
func Ls(s3Uri string, searchDepth int, isRecursive, isHumanReadable, includeDate bool) {
bucket, prefix := parseS3Uri(s3Uri)
b := GetBucket(bucket)
ch := s3wrapper.ListMain(b, prefix, searchDepth, isRecursive)
for k := range ch {
if k.Size < 0 {
fmt.Printf("%10s s3://%s/%s\n", "DIR", bucket, k.Key)
} else {
var size string
if isHumanReadable {
size = fmt.Sprintf("%10s", humanize.Bytes(uint64(k.Size)))
} else {
size = fmt.Sprintf("%10d", k.Size)
}
date := ""
if includeDate {
date = " " + k.LastModified
}
fmt.Printf("%s%s s3://%s/%s\n", size, date, bucket, k.Key)
}
}
}
// Del deletes a set of prefixes(s3 keys or partial keys
func Del(prefixes []string, searchDepth int, isRecursive bool) {
if len(*delPrefixes) == 0 {
fmt.Printf("No prefixes provided\n Usage: fasts3 del <prefix>")
return
}
keys := make(chan string, len(prefixes)*2+1)
var b *s3.Bucket = nil
go func() {
for _, delPrefix := range prefixes {
bucket, prefix := parseS3Uri(delPrefix)
if b == nil {
b = GetBucket(bucket)
}
keys <- prefix
if *delRecurse {
keyExists, err := b.Exists(prefix)
if err != nil {
log.Fatalln(err)
}
if keyExists {
keys <- prefix
} else if *delRecurse {
for key := range s3wrapper.ListRecurse(b, prefix, searchDepth) {
keys <- key.Key
}
} else {
fmt.Printf("trying to delete a prefix, please add --recursive or -r to proceed\n")
}
}
}
close(keys)
}()
var wg sync.WaitGroup
msgs := make(chan string, 1000)
for i := 1; i <= 10; i++ {
wg.Add(1)
go func() {
batch := make([]string, 0, 100)
for key := range keys {
batch = append(batch, key)
if len(batch) >= 100 {
err := s3wrapper.DeleteMulti(b, batch)
if err != nil {
log.Fatalln(err)
}
for _, k := range batch {
msgs <- fmt.Sprintf("File %s Deleted\n", k)
}
batch = batch[:0]
}
}
if len(batch) > 0 {
err := s3wrapper.DeleteMulti(b, batch)
if err != nil {
log.Fatalln(err)
}
for _, k := range batch {
msgs <- fmt.Sprintf("File %s Deleted\n", k)
}
}
wg.Done()
}()
}
go func() {
wg.Wait()
close(msgs)
}()
for msg := range msgs {
fmt.Print(msg)
}
}
// initializes configs necessary for fasts3 utility
func Init() error {
usr, err := user.Current()
if err != nil {
return err
}
fs3cfg_path := path.Join(usr.HomeDir, ".fs3cfg")
if _, err := os.Stat(fs3cfg_path); os.IsNotExist(err) {
cfg := `[default]
access_key=<access_key>
secret_key=<secret_key>`
ioutil.WriteFile(fs3cfg_path, []byte(cfg), 0644)
fmt.Printf("created template file %s\n", fs3cfg_path)
} else {
fmt.Print(".fs3cfg already exists in home directory")
}
return nil
}
type GetRequest struct {
Key string
OriginalPrefix string
}
// Get lists and retrieves s3 keys given a list of prefixes
// searchDepth can also be specified to increase speed of listing
func Get(prefixes []string, searchDepth int) {
if len(prefixes) == 0 {
fmt.Printf("No prefixes provided\n Usage: fasts3 get <prefix>")
return
}
getRequests := make(chan GetRequest, len(prefixes)*2+1)
var b *s3.Bucket = nil
go func() {
for _, prefix := range prefixes {
bucket, prefix := parseS3Uri(prefix)
if b == nil {
b = GetBucket(bucket)
}
keyExists, err := b.Exists(prefix)
if err != nil {
log.Fatalln(err)
}
if keyExists {
keyParts := strings.Split(prefix, "/")
ogPrefix := strings.Join(keyParts[0:len(keyParts)-1], "/") + "/"
getRequests <- GetRequest{Key: prefix, OriginalPrefix: ogPrefix}
} else {
for key := range s3wrapper.ListRecurse(b, prefix, searchDepth) {
getRequests <- GetRequest{Key: key.Key, OriginalPrefix: prefix}
}
}
}
close(getRequests)
}()
var wg sync.WaitGroup
msgs := make(chan string, 1000)
workingDirectory, err := os.Getwd()
if err != nil {
log.Fatalln(err)
}
for i := 1; i <= 10; i++ {
wg.Add(1)
go func() {
for rq := range getRequests {
dest := path.Join(workingDirectory, strings.Replace(rq.Key, rq.OriginalPrefix, "", 1))
msgs <- fmt.Sprintf("Getting %s -> %s\n", rq.Key, dest)
err := s3wrapper.GetToFile(b, rq.Key, dest)
if err != nil {
log.Fatalln(err)
}
}
wg.Done()
}()
}
go func() {
wg.Wait()
close(msgs)
}()
for msg := range msgs {
fmt.Print(msg)
}
}
// getReaderByExt is a factory for reader based on the extension of the key
func getReaderByExt(bts []byte, key string) (*bufio.Reader, error) {
ext := path.Ext(key)
reader := bytes.NewReader(bts)
if ext == ".gz" {
gzReader, err := gzip.NewReader(reader)
if err != nil {
return nil, err
}
return bufio.NewReader(gzReader), nil
} else {
return bufio.NewReader(reader), nil
}
}
// Stream takes a set of prefixes lists them and
// streams the contents by line
func Stream(prefixes []string, searchDepth int, keyRegex string, includeKeyName bool) {
if len(prefixes) == 0 {
fmt.Printf("No prefixes provided\n Usage: fasts3 get <prefix>")
return
}
keys := make(chan string, len(prefixes)*2+1)
var keyRegexFilter *regexp.Regexp
if keyRegex != "" {
keyRegexFilter = regexp.MustCompile(keyRegex)
} else {
keyRegexFilter = nil
}
var b *s3.Bucket = nil
go func() {
for _, prefix := range prefixes {
bucket, prefix := parseS3Uri(prefix)
if b == nil {
b = GetBucket(bucket)
}
keyExists, err := b.Exists(prefix)
if err != nil {
log.Fatalln(err)
}
if keyExists {
if keyRegexFilter != nil && !keyRegexFilter.MatchString(prefix) {
continue
}
keys <- prefix
} else {
for key := range s3wrapper.ListRecurse(b, prefix, searchDepth) {
if keyRegexFilter != nil && !keyRegexFilter.MatchString(key.Key) {
continue
}
keys <- key.Key
}
}
}
close(keys)
}()
var wg sync.WaitGroup
msgs := make(chan string, 1000)
for i := 1; i <= 10; i++ {
wg.Add(1)
go func() {
for key := range keys {
bts, err := s3wrapper.Get(b, key)
reader, err := getReaderByExt(bts, key)
if err != nil {
panic(err)
}
for {
line, _, err := reader.ReadLine()
if err != nil {
if err.Error() == "EOF" {
break
} else {
log.Fatalln(err)
}
}
msg := fmt.Sprintf("%s\n", string(line))
if includeKeyName {
msg = fmt.Sprintf("[%s] %s", key, msg)
}
msgs <- msg
}
}
wg.Done()
}()
}
go func() {
wg.Wait()
close(msgs)
}()
for msg := range msgs {
fmt.Print(msg)
}
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
switch kingpin.MustParse(app.Parse(os.Args[1:])) {
case "ls":
Ls(*lsS3Uri, *lsSearchDepth, *lsRecurse, *humanReadable, *withDate)
case "del":
Del(*delPrefixes, *lsSearchDepth, *delRecurse)
case "get":
Get(*getS3Uris, *getSearchDepth)
case "stream":
Stream(*streamS3Uris, *streamSearchDepth, *streamKeyRegex, *streamIncludeKeyName)
case "init":
Init()
}
}