First version of PublishedStorage for S3. #15

s3/public.go

@@ -0,0 +1,195 @@
+package s3
+
+import (
+	"fmt"
+	"github.com/mitchellh/goamz/aws"
+	"github.com/mitchellh/goamz/s3"
+	"github.com/smira/aptly/aptly"
+	"github.com/smira/aptly/files"
+	"os"
+	"path/filepath"
+)
+
+// PublishedStorage abstract file system with published files (actually hosted on S3)
+type PublishedStorage struct {
+	s3     *s3.S3
+	bucket *s3.Bucket
+	acl    s3.ACL
+	prefix string
+}
+
+// Check interface
+var (
+	_ aptly.PublishedStorage = (*PublishedStorage)(nil)
+)
+
+func NewPublishedStorageRaw(auth aws.Auth, region aws.Region, bucket, defaultACL, prefix string) (*PublishedStorage, error) {
+	if defaultACL == "" {
+		defaultACL = "private"
+	}
+
+	result := &PublishedStorage{s3: s3.New(auth, region), acl: s3.ACL(defaultACL), prefix: prefix}
+	result.bucket = result.s3.Bucket(bucket)
+
+	return result, nil
+}
+
+// NewPublishedStorage creates new instance of PublishedStorage with specified S3 access
+// keys, region and bucket name
+func NewPublishedStorage(accessKey, secretKey, region, bucket, defaultACL, prefix string) (*PublishedStorage, error) {
+	auth, err := aws.GetAuth(accessKey, secretKey)
+	if err != nil {
+		return nil, err
+	}
+
+	awsRegion, ok := aws.Regions[region]
+	if !ok {
+		return nil, fmt.Errorf("unknown region: %#v", region)
+	}
+
+	return NewPublishedStorageRaw(auth, awsRegion, bucket, defaultACL, prefix)
+}
+
+// PublicPath returns root of public part
+func (storage *PublishedStorage) PublicPath() string {
+	panic("never would be implemented")
+}
+
+// MkDir creates directory recursively under public path
+func (storage *PublishedStorage) MkDir(path string) error {
+	// no op for S3
+	return nil
+}
+
+// PutFile puts file into published storage at specified path
+func (storage *PublishedStorage) PutFile(path string, sourceFilename string) error {
+	var (
+		source *os.File
+		err    error
+		fi     os.FileInfo
+	)
+	source, err = os.Open(sourceFilename)
+	if err != nil {
+		return err
+	}
+	defer source.Close()
+
+	fi, err = source.Stat()
+	if err != nil {
+		return err
+	}
+
+	return storage.bucket.PutReader(filepath.Join(storage.prefix, path), source, fi.Size(), "binary/octet-stream", storage.acl)
+}
+
+// Remove removes single file under public path
+func (storage *PublishedStorage) Remove(path string) error {
+	return storage.bucket.Del(filepath.Join(storage.prefix, path))
+}
+
+// RemoveDirs removes directory structure under public path
+func (storage *PublishedStorage) RemoveDirs(path string, progress aptly.Progress) error {
+	const page = 1000
+
+	filelist, err := storage.Filelist(path)
+	numParts := (len(filelist) + page - 1) / page
+
+	for i := 0; i < numParts; i++ {
+		var part []string
+		if i == numParts-1 {
+			part = filelist[i*page:]
+		} else {
+			part = filelist[i*page : (i+1)*page]
+		}
+		paths := make([]string, len(part))
+
+		for i := range part {
+			paths[i] = filepath.Join(storage.prefix, path, part[i])
+		}
+
+		err = storage.bucket.MultiDel(paths)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// LinkFromPool links package file from pool to dist's pool location
+//
+// publishedDirectory is desired location in pool (like prefix/pool/component/liba/libav/)
+// sourcePool is instance of aptly.PackagePool
+// sourcePath is filepath to package file in package pool
+//
+// LinkFromPool returns relative path for the published file to be included in package index
+func (storage *PublishedStorage) LinkFromPool(publishedDirectory string, sourcePool aptly.PackagePool, sourcePath, sourceMD5 string) error {
+	// verify that package pool is local pool in filesystem
+	_ = sourcePool.(*files.PackagePool)
+
+	baseName := filepath.Base(sourcePath)
+	relPath := filepath.Join(publishedDirectory, baseName)
+	poolPath := filepath.Join(storage.prefix, relPath)
+
+	var (
+		dstKey *s3.Key
+		err    error
+	)
+
+	dstKey, err = storage.bucket.GetKey(poolPath)
+	if err != nil {
+		if s3err, ok := err.(*s3.Error); !ok || s3err.StatusCode != 404 {
+			return err
+		}
+	} else {
+		if dstKey.ETag == sourceMD5 {
+			return nil
+		}
+	}
+
+	return storage.PutFile(relPath, sourcePath)
+}
+
+// Filelist returns list of files under prefix
+func (storage *PublishedStorage) Filelist(prefix string) ([]string, error) {
+	result := []string{}
+	marker := ""
+	prefix = filepath.Join(storage.prefix, prefix)
+	if prefix != "" {
+		prefix += "/"
+	}
+	for {
+		contents, err := storage.bucket.List(prefix, "", marker, 1000)
+		if err != nil {
+			return nil, err
+		}
+		last_key := ""
+		for _, key := range contents.Contents {
+			if prefix == "" {
+				result = append(result, key.Key)
+			} else {
+				result = append(result, key.Key[len(prefix):])
+			}
+			last_key = key.Key
+		}
+		if contents.IsTruncated {
+			marker = contents.NextMarker
+			if marker == "" {
+				// From the s3 docs: If response does not include the
+				// NextMarker and it is truncated, you can use the value of the
+				// last Key in the response as the marker in the subsequent
+				// request to get the next set of object keys.
+				marker = last_key
+			}
+		} else {
+			break
+		}
+	}
+
+	return result, nil
+}
+
+// RenameFile renames (moves) file
+func (storage *PublishedStorage) RenameFile(oldName, newName string) error {
+	panic("not implemented yet")
+}