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list.go
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list.go
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package sos
import (
"context"
"fmt"
"sort"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/s3"
"github.com/exoscale/cli/pkg/storage/sos/object"
)
type listFunc[ObjectType object.ObjectInterface] func(ctx context.Context) (*listCallOut[ObjectType], error)
type listCallOut[ObjectType object.ObjectInterface] struct {
Objects []ObjectType
CommonPrefixes []string
IsTruncated bool
}
type ObjectListing[ObjectType object.ObjectInterface] struct {
List []ObjectType
CommonPrefixes []string
}
func (c *Client) ListObjectsFunc(bucket, prefix string, recursive, stream bool) listFunc[object.ObjectInterface] {
var continuationToken *string
deduplicate := GetCommonPrefixDeduplicator(stream)
return func(ctx context.Context) (*listCallOut[object.ObjectInterface], error) {
req := s3.ListObjectsV2Input{
Bucket: aws.String(bucket),
Prefix: aws.String(prefix),
ContinuationToken: continuationToken,
}
if !recursive {
req.Delimiter = aws.String("/")
}
res, err := c.S3Client.ListObjectsV2(ctx, &req)
if err != nil {
return nil, err
}
continuationToken = res.NextContinuationToken
var objects []object.ObjectInterface
for i := range res.Contents {
o := &object.Object{
Object: &res.Contents[i],
}
objects = append(objects, o)
}
return &listCallOut[object.ObjectInterface]{
Objects: objects,
CommonPrefixes: deduplicate(res.CommonPrefixes),
IsTruncated: res.IsTruncated,
}, nil
}
}
func (c *Client) ListVersionedObjectsFunc(bucket, prefix string, recursive, stream bool) listFunc[object.ObjectVersionInterface] {
var keyMarker *string
var versionIdMarker *string
deduplicate := GetCommonPrefixDeduplicator(stream)
return func(ctx context.Context) (*listCallOut[object.ObjectVersionInterface], error) {
req := s3.ListObjectVersionsInput{
Bucket: aws.String(bucket),
Prefix: aws.String(prefix),
KeyMarker: keyMarker,
VersionIdMarker: versionIdMarker,
}
if !recursive {
req.Delimiter = aws.String("/")
}
res, err := c.S3Client.ListObjectVersions(ctx, &req)
if err != nil {
return nil, err
}
keyMarker = res.NextKeyMarker
versionIdMarker = res.NextVersionIdMarker
var objects []object.ObjectVersionInterface
for i := range res.Versions {
o := object.ObjectVersion{
ObjectVersion: &res.Versions[i],
}
objects = append(objects, &o)
}
return &listCallOut[object.ObjectVersionInterface]{
Objects: objects,
CommonPrefixes: deduplicate(res.CommonPrefixes),
IsTruncated: res.IsTruncated,
}, nil
}
}
func assignVersionNumbers(objs []object.ObjectVersionInterface) {
// S3 does not guarantee that versions of objects appear in a particular order thus we have to sort before we assign a version number
sort.Slice(objs, func(i, j int) bool {
return objs[i].GetLastModified().After(*objs[j].GetLastModified())
})
latestVersionPerObj := make(map[string]uint64)
// we traverse in reverse order because the latest version should always get the highest version number. Why don't we sort in reverse order? Because we also want the latest version to appear on top.
for i := len(objs) - 1; i >= 0; i-- {
obj := objs[i]
key := *obj.GetKey()
latestVersion, ok := latestVersionPerObj[key]
if !ok {
latestVersionPerObj[key] = 0
obj.SetVersionNumber(0)
continue
}
latestVersion++
latestVersionPerObj[key] = latestVersion
obj.SetVersionNumber(latestVersion)
}
}
func getObjectListing[ObjectType object.ObjectInterface](ctx context.Context, c *Client, list listFunc[ObjectType], stream bool) (*ObjectListing[ObjectType], error) {
listing := ObjectListing[ObjectType]{}
for {
res, err := list(ctx)
if err != nil {
return nil, err
}
if stream {
for _, o := range res.Objects {
fmt.Println(*o.GetKey())
}
} else {
listing.List = append(listing.List, res.Objects...)
}
listing.CommonPrefixes = append(listing.CommonPrefixes, res.CommonPrefixes...)
if !res.IsTruncated {
break
}
}
return &listing, nil
}
func (c *Client) ListObjects(ctx context.Context, list listFunc[object.ObjectInterface], recursive, stream bool, filters []object.ObjectFilterFunc) (*object.ListObjectsOutput, error) {
listing, err := getObjectListing(ctx, c, list, stream)
if err != nil {
return nil, err
}
var objects []object.ObjectInterface
for _, obj := range listing.List {
if object.ApplyFilters(obj, filters) {
objects = append(objects, obj)
}
}
listing.List = objects
return prepareListObjectsOutput(listing, recursive, stream)
}
func (c *Client) ListObjectsVersions(ctx context.Context, list listFunc[object.ObjectVersionInterface], recursive, stream bool,
filters []object.ObjectFilterFunc,
versionFilters []object.ObjectVersionFilterFunc) (*object.ListObjectsOutput, error) {
listing, err := getObjectListing(ctx, c, list, stream)
if err != nil {
return nil, err
}
assignVersionNumbers(listing.List)
var objects []object.ObjectVersionInterface
for _, obj := range listing.List {
if object.ApplyFilters(obj, filters) && object.ApplyVersionedFilters(obj, versionFilters) {
objects = append(objects, obj)
}
}
listing.List = objects
return prepareListObjectsOutput(listing, recursive, stream)
}
func prepareListObjectsOutput[ObjectType object.ObjectInterface](listing *ObjectListing[ObjectType], recursive, stream bool) (*object.ListObjectsOutput, error) {
out := make(object.ListObjectsOutput, 0)
dirsOut := make(object.ListObjectsOutput, 0) // to separate common prefixes (folders) from objects (files)
if !recursive {
for _, cp := range listing.CommonPrefixes {
dirsOut = append(dirsOut, object.ListObjectsItemOutput{
Path: cp,
Dir: true,
})
}
}
for _, o := range listing.List {
out = append(out, *o.GetListObjectsItemOutput())
}
// To be user friendly, we are going to push dir records to the top of the output list
if !stream && !recursive {
out = append(dirsOut, out...)
}
return &out, nil
}