forked from barnybug/s3
/
commands.go
502 lines (458 loc) · 9.82 KB
/
commands.go
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//
// s3 - Swiss army pen-knife for Amazon S3.
//
// https://github.com/barnybug/s3
//
// Copyright (c) 2015 Barnaby Gray
package s3
import (
"bytes"
"compress/gzip"
"errors"
"fmt"
"io"
"os"
"path"
"regexp"
"strings"
"sync"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3iface"
)
var reBucketPath = regexp.MustCompile("^(?:s3://)?([^/]+)/?(.*)$")
var out io.Writer = os.Stdout
var err io.Writer = os.Stderr
var (
ErrNotFound = errors.New("No files found")
)
func extractBucketPath(url string) (string, string) {
parts := reBucketPath.FindStringSubmatch(url)
return parts[1], parts[2]
}
func listBuckets(conn s3iface.S3API) error {
output, err := conn.ListBuckets(nil)
if err != nil {
return err
}
for _, b := range output.Buckets {
fmt.Fprintf(out, "s3://%s/\n", *b.Name)
}
return nil
}
func iterateKeys(conn s3iface.S3API, urls []string, callback func(file File) error) error {
found := false
for _, url := range urls {
fs := getFilesystem(conn, url)
ch := fs.Files()
for file := range ch {
found = true
err := callback(file)
if err != nil {
return err
}
}
if fs.Error() != nil {
return fs.Error()
}
}
if !found {
return ErrNotFound
}
return nil
}
func iterateKeysParallel(conn s3iface.S3API, urls []string, callback func(file File) error) error {
// create pool for processing
var err error
wg := sync.WaitGroup{}
q := make(chan File, 1000)
for i := 0; i < parallel; i += 1 {
wg.Add(1)
go func() {
defer wg.Done()
for key := range q {
e := callback(key)
if e != nil {
err = e
return
}
}
}()
}
e := iterateKeys(conn, urls, func(file File) error {
q <- file
return nil
})
if e != nil {
return e
}
close(q)
wg.Wait()
return err
}
func listKeys(conn s3iface.S3API, urls []string) error {
var count, totalSize int64
err := iterateKeys(conn, urls, func(file File) error {
if quiet {
fmt.Fprintln(out, file)
} else {
fmt.Fprintf(out, "%s\t%db\n", file, file.Size())
}
count += 1
totalSize += file.Size()
return nil
})
if err != nil && err != ErrNotFound {
return err
}
if !quiet {
fmt.Fprintf(out, "\n%d files, %d bytes\n", count, totalSize)
}
return nil
}
func getKeys(conn s3iface.S3API, urls []string) error {
for _, url := range urls {
if !isS3Url(url) {
return errors.New("s3:// url required")
}
}
err := iterateKeysParallel(conn, urls, func(file File) error {
reader, err := file.Reader()
if err != nil {
return err
}
defer reader.Close()
// write files under relative path to the source path
fpath := file.Relative()
dirpath := path.Dir(fpath)
if dirpath != "." {
err = os.MkdirAll(dirpath, 0777)
if err != nil {
return err
}
}
writer, err := os.Create(fpath)
if err != nil {
return err
}
nbytes, err := io.Copy(writer, reader)
if err != nil {
return err
}
if !quiet {
fmt.Fprintf(out, "%s -> %s (%d bytes)\n", file, fpath, nbytes)
}
return nil
})
return err
}
func catKeys(conn s3iface.S3API, urls []string) error {
return iterateKeysParallel(conn, urls, func(file File) error {
reader, err := file.Reader()
if err != nil {
return err
}
defer reader.Close()
if strings.HasSuffix(file.String(), ".gz") {
reader, err = gzip.NewReader(reader)
if err != nil {
return err
}
}
_, err = io.Copy(out, reader)
if err != nil {
return err
}
return nil
})
}
func grepKeys(conn s3iface.S3API, find string, urls []string) error {
findBytes := []byte(find)
return iterateKeysParallel(conn, urls, func(file File) error {
reader, err := file.Reader()
if err != nil {
return err
}
defer reader.Close()
if strings.HasSuffix(file.String(), ".gz") {
reader, err = gzip.NewReader(reader)
if err != nil {
return err
}
}
buf := make([]byte, 4096)
offset := 0
for n, err := reader.Read(buf[offset:]); n > 0 && err == nil; n, err = reader.Read(buf) {
if bytes.Contains(buf, findBytes) {
fmt.Fprintln(out, file.String())
break
}
// handle overlapping matches - copy last N-1 bytes to start of next
offset = len(findBytes) - 1
if offset > n {
offset = n
} else {
copy(buf, buf[n-offset:])
}
}
if err != nil && err != io.EOF {
return err
}
return nil
})
}
func deleteBatch(conn s3iface.S3API, bucket string, batch []*s3.ObjectIdentifier) error {
if !dryRun {
deleteRequest := s3.Delete{
Objects: batch,
}
input := s3.DeleteObjectsInput{
Bucket: aws.String(bucket),
Delete: &deleteRequest,
}
_, err := conn.DeleteObjects(&input)
return err
}
return nil
}
func rmKeys(conn s3iface.S3API, urls []string) error {
for _, url := range urls {
if !isS3Url(url) {
return errors.New("Cowardly refusing to remove local files. Use rm.")
}
}
batch := make([]*s3.ObjectIdentifier, 0, 1000)
var bucket string
start := time.Now()
var deleted int
err := iterateKeys(conn, urls, func(file File) error {
deleted += 1
if !quiet {
fmt.Fprintf(out, "D %s\n", file)
}
switch t := file.(type) {
case *S3File:
// optimize as a batch delete
if t.bucket != bucket && len(batch) > 0 {
deleteBatch(conn, bucket, batch)
batch = batch[:0]
}
bucket = t.bucket
obj := s3.ObjectIdentifier{Key: t.object.Key}
batch = append(batch, &obj)
if len(batch) == 1000 {
deleteBatch(conn, bucket, batch)
batch = batch[:0]
}
default:
if !dryRun {
file.Delete()
}
}
return nil
})
if err != nil {
return err
}
// final batch
if len(batch) > 0 {
deleteBatch(conn, bucket, batch)
}
end := time.Now()
took := end.Sub(start)
summary(0, deleted, 0, 0, took)
return nil
}
func rmBuckets(conn s3iface.S3API, buckets []string) error {
for _, name := range buckets {
bucket, _ := extractBucketPath(name)
input := s3.DeleteBucketInput{Bucket: aws.String(bucket)}
_, err := conn.DeleteBucket(&input)
if err != nil {
return err
}
}
return nil
}
func summary(added, deleted, updated, unchanged int, took time.Duration) {
rate := float64(added+deleted+updated) / took.Seconds()
if dryRun {
fmt.Fprintln(out, "-- summary (dry-run) --")
} else {
fmt.Fprintln(out, "-- summary --")
}
fmt.Fprintf(out, `%d added %d deleted %d updated %d unchanged
took: %s (%.1f ops/s)
`, added, deleted, updated, unchanged, took, rate)
}
func putBuckets(conn s3iface.S3API, buckets []string) error {
for _, bucket := range buckets {
input := s3.CreateBucketInput{
ACL: aws.String(acl),
Bucket: aws.String(bucket),
}
_, err := conn.CreateBucket(&input)
if err != nil {
return err
}
}
return nil
}
func putKeys(conn s3iface.S3API, sources []string, destination string) error {
start := time.Now()
if !isS3Url(destination) {
return errors.New("s3:// url required for destination")
}
dfs := getFilesystem(conn, destination)
var added int
err := iterateKeysParallel(conn, sources, func(file File) error {
reader, err := file.Reader()
if err != nil {
return err
}
defer reader.Close()
if !quiet {
fmt.Fprintf(out, "A %s\n", file)
}
err = dfs.Create(file)
if err != nil {
return err
}
added += 1
return nil
})
if err != nil {
return err
}
end := time.Now()
took := end.Sub(start)
summary(added, 0, 0, 0, took)
return nil
}
func isS3Url(url string) bool {
return strings.HasPrefix(url, "s3:")
}
func getFilesystem(conn s3iface.S3API, url string) Filesystem {
if isS3Url(url) {
bucket, prefix := extractBucketPath(url)
return &S3Filesystem{conn: conn, bucket: bucket, path: prefix}
} else {
return &LocalFilesystem{path: url}
}
}
type Action struct {
Action string
File File
}
func processAction(action Action, fs2 Filesystem) error {
switch action.Action {
case "create":
if !quiet {
fmt.Fprintf(out, "A %s\n", action.File.Relative())
}
if dryRun {
return nil
}
err := fs2.Create(action.File)
if err != nil {
if ignoreErrors {
fmt.Fprintf(out, "E %s: %s\n", action.File.Relative(), err)
} else {
return err
}
}
case "delete":
if !quiet {
fmt.Fprintf(out, "D %s\n", action.File.Relative())
}
if dryRun {
return nil
}
err := fs2.Delete(action.File.Relative())
if err != nil {
return err
}
case "update":
if !quiet {
fmt.Fprintf(out, "U %s\n", action.File.Relative())
}
if dryRun {
return nil
}
err := fs2.Create(action.File)
if err != nil {
return err
}
}
return nil
}
func syncFiles(conn s3iface.S3API, src, dest string) error {
start := time.Now()
fs1 := getFilesystem(conn, src)
fs2 := getFilesystem(conn, dest)
ch1 := fs1.Files()
f1 := <-ch1
ch2 := fs2.Files()
f2 := <-ch2
// create pool for processing
wg := sync.WaitGroup{}
q := make(chan Action, 1000)
for i := 0; i < parallel; i += 1 {
wg.Add(1)
go func() {
defer wg.Done()
for action := range q {
processAction(action, fs2)
}
}()
}
var added, deleted, updated, unchanged int
var err error
for {
err = fs1.Error()
if err != nil {
break
}
err = fs2.Error()
if err != nil {
break
}
// iterate files in fs1 and fs2
// if f1 is nil and f2 is nil, we're done
// if f1 is nil or f1 < f2, create f1
// if f2 is nil or f1 > f2, delete f2
// if f1 = f2, check size, md5
if f1 == nil && f2 == nil {
break
} else if f2 == nil || (f1 != nil && f1.Relative() < f2.Relative()) {
q <- Action{"create", f1}
added += 1
f1 = <-ch1
} else if f1 == nil || (f2 != nil && f1.Relative() > f2.Relative()) {
if deleteExtra {
q <- Action{"delete", f2}
deleted += 1
}
f2 = <-ch2
} else if f1.Size() != f2.Size() || bytes.Compare(f1.MD5(), f2.MD5()) != 0 {
q <- Action{"update", f1}
updated += 1
f1 = <-ch1
f2 = <-ch2
} else {
unchanged += 1
f1 = <-ch1
f2 = <-ch2
}
}
close(q)
wg.Wait()
if err != nil {
return err
}
end := time.Now()
took := end.Sub(start)
summary(added, deleted, updated, unchanged, took)
return nil
}