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package s3store
import (
"bytes"
"context"
"crypto/rand"
"encoding/hex"
"errors"
"fmt"
"io"
"os"
"path"
"strings"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/s3"
"github.com/aws/smithy-go"
"github.com/npfaro/dumbforge/internal/remoteurl"
)
type Object struct {
Data []byte
ETag string
}
type Store struct {
client *s3.Client
spec remoteurl.Spec
}
func New(ctx context.Context, spec remoteurl.Spec) (*Store, error) {
opts := []func(*config.LoadOptions) error{config.WithRegion("auto")}
if spec.Profile != "" {
opts = append(opts, config.WithSharedConfigProfile(spec.Profile))
}
cfg, err := config.LoadDefaultConfig(ctx, opts...)
if err != nil {
return nil, fmt.Errorf("load AWS configuration: %w", err)
}
client := s3.NewFromConfig(cfg, func(o *s3.Options) {
o.BaseEndpoint = aws.String(spec.Endpoint)
o.UsePathStyle = true
// S3-compatible services do not uniformly support the SDK's optional
// streaming CRC32 trailer, especially when Content-Encoding is set.
o.RequestChecksumCalculation = aws.RequestChecksumCalculationWhenRequired
})
return &Store{client: client, spec: spec}, nil
}
func (s *Store) Spec() remoteurl.Spec { return s.spec }
func (s *Store) key(name string) string {
return path.Join(strings.Trim(s.spec.Prefix, "/"), strings.TrimLeft(name, "/"))
}
// RootKey returns the object key used for the repository's HTML landing page.
// It intentionally has no trailing slash; Git can still append /info/refs to
// the same URL when cloning.
func (s *Store) RootKey() string { return strings.Trim(s.spec.Prefix, "/") }
func (s *Store) Get(ctx context.Context, name string) (Object, error) {
out, err := s.client.GetObject(ctx, &s3.GetObjectInput{
Bucket: aws.String(s.spec.Bucket),
Key: aws.String(s.key(name)),
})
if err != nil {
return Object{}, err
}
defer out.Body.Close()
data, err := io.ReadAll(out.Body)
if err != nil {
return Object{}, fmt.Errorf("read s3://%s/%s: %w", s.spec.Bucket, s.key(name), err)
}
return Object{Data: data, ETag: aws.ToString(out.ETag)}, nil
}
func (s *Store) Put(ctx context.Context, name string, data []byte, contentType, cacheControl string) error {
return s.putBytes(ctx, s.key(name), data, contentType, cacheControl, "")
}
func (s *Store) PutEncoded(ctx context.Context, name string, data []byte, contentType, cacheControl, contentEncoding string) error {
return s.putBytes(ctx, s.key(name), data, contentType, cacheControl, contentEncoding)
}
func (s *Store) PutRoot(ctx context.Context, data []byte, contentType, cacheControl string) error {
return s.putBytes(ctx, s.RootKey(), data, contentType, cacheControl, "")
}
func (s *Store) PutRootEncoded(ctx context.Context, data []byte, contentType, cacheControl, contentEncoding string) error {
return s.putBytes(ctx, s.RootKey(), data, contentType, cacheControl, contentEncoding)
}
func (s *Store) putBytes(ctx context.Context, key string, data []byte, contentType, cacheControl, contentEncoding string) error {
input := &s3.PutObjectInput{
Bucket: aws.String(s.spec.Bucket),
Key: aws.String(key),
Body: bytes.NewReader(data),
ContentType: aws.String(contentType),
}
if cacheControl != "" {
input.CacheControl = aws.String(cacheControl)
}
if contentEncoding != "" {
input.ContentEncoding = aws.String(contentEncoding)
}
_, err := s.client.PutObject(ctx, input)
if err != nil {
return fmt.Errorf("put s3://%s/%s: %w", s.spec.Bucket, key, err)
}
return nil
}
func (s *Store) PutFile(ctx context.Context, name, filename, contentType, cacheControl string) error {
// #nosec G304 -- callers pass paths produced in our private pack directory.
f, err := os.Open(filename)
if err != nil {
return err
}
defer f.Close()
input := &s3.PutObjectInput{
Bucket: aws.String(s.spec.Bucket),
Key: aws.String(s.key(name)),
Body: f,
ContentType: aws.String(contentType),
}
if cacheControl != "" {
input.CacheControl = aws.String(cacheControl)
}
_, err = s.client.PutObject(ctx, input)
if err != nil {
return fmt.Errorf("put s3://%s/%s: %w", s.spec.Bucket, s.key(name), err)
}
return nil
}
func (s *Store) Delete(ctx context.Context, name string) error {
_, err := s.client.DeleteObject(ctx, &s3.DeleteObjectInput{
Bucket: aws.String(s.spec.Bucket),
Key: aws.String(s.key(name)),
})
if err != nil {
return fmt.Errorf("delete s3://%s/%s: %w", s.spec.Bucket, s.key(name), err)
}
return nil
}
type Lock struct {
store *Store
name string
token string
etag string
refreshedAt time.Time
}
func (s *Store) AcquireLock(ctx context.Context) (*Lock, error) {
random := make([]byte, 16)
if _, err := rand.Read(random); err != nil {
return nil, err
}
token := hex.EncodeToString(random)
body := []byte(fmt.Sprintf("%s\n%s\n", token, time.Now().UTC().Format(time.RFC3339Nano)))
name := ".dumbforge/lock"
input := &s3.PutObjectInput{
Bucket: aws.String(s.spec.Bucket),
Key: aws.String(s.key(name)),
Body: bytes.NewReader(body),
ContentType: aws.String("text/plain; charset=utf-8"),
IfNoneMatch: aws.String("*"),
}
out, err := s.client.PutObject(ctx, input)
if err != nil {
if IsPreconditionFailed(err) {
existing, getErr := s.Get(ctx, name)
if getErr != nil {
return nil, fmt.Errorf("repository is locked by another push")
}
lines := strings.Split(string(existing.Data), "\n")
if len(lines) < 2 {
return nil, fmt.Errorf("repository is locked by another push")
}
lockedAt, timeErr := time.Parse(time.RFC3339Nano, lines[1])
if timeErr != nil || time.Since(lockedAt) < time.Hour {
return nil, fmt.Errorf("repository is locked by another push")
}
input.IfNoneMatch = nil
input.IfMatch = aws.String(existing.ETag)
out, err = s.client.PutObject(ctx, input)
if err != nil {
return nil, fmt.Errorf("replace stale repository lock: %w", err)
}
} else {
return nil, fmt.Errorf("acquire repository lock: %w", err)
}
}
return &Lock{store: s, name: name, token: token, etag: aws.ToString(out.ETag), refreshedAt: time.Now()}, nil
}
// Refresh proves that this process still owns the lease before it publishes
// mutable repository metadata.
func (l *Lock) Refresh(ctx context.Context) error {
body := []byte(fmt.Sprintf("%s\n%s\n", l.token, time.Now().UTC().Format(time.RFC3339Nano)))
out, err := l.store.client.PutObject(ctx, &s3.PutObjectInput{
Bucket: aws.String(l.store.spec.Bucket),
Key: aws.String(l.store.key(l.name)),
Body: bytes.NewReader(body),
ContentType: aws.String("text/plain; charset=utf-8"),
IfMatch: aws.String(l.etag),
})
if err != nil {
return fmt.Errorf("refresh repository lock: %w", err)
}
l.etag = aws.ToString(out.ETag)
l.refreshedAt = time.Now()
return nil
}
// RefreshIfOlderThan avoids an S3 round trip for ordinary pushes while still
// renewing the lease during unusually long publications.
func (l *Lock) RefreshIfOlderThan(ctx context.Context, age time.Duration) error {
if time.Since(l.refreshedAt) < age {
return nil
}
return l.Refresh(ctx)
}
func (l *Lock) Release(ctx context.Context) error {
_, err := l.store.client.DeleteObject(ctx, &s3.DeleteObjectInput{
Bucket: aws.String(l.store.spec.Bucket),
Key: aws.String(l.store.key(l.name)),
IfMatch: aws.String(l.etag),
})
if err != nil {
return fmt.Errorf("release repository lock: %w", err)
}
return nil
}
func IsNotFound(err error) bool {
var apiErr smithy.APIError
if !errors.As(err, &apiErr) {
return false
}
switch apiErr.ErrorCode() {
case "NoSuchKey", "NotFound", "404":
return true
default:
return false
}
}
func IsPreconditionFailed(err error) bool {
var apiErr smithy.APIError
if !errors.As(err, &apiErr) {
return false
}
return apiErr.ErrorCode() == "PreconditionFailed" || apiErr.ErrorCode() == "412"
}
|
