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getBucketObjects.go
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/
getBucketObjects.go
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package commands
import (
"errors"
"github.com/SpectraLogic/ds3_go_sdk/ds3"
"github.com/SpectraLogic/ds3_go_sdk/ds3/models"
)
// Gets all objects in a bucket, performing multiple requests if the results
// are paged. Also supports limiting to an arbitrary number of keys independent
// of page size.
func getBucketObjects(client *ds3.Client, args *Arguments) ([]models.Ds3PutObject, error) {
// Validate arguments.
if args.Bucket == "" {
return nil, errors.New("Must specify a bucket name when doing get_bucket.")
}
// Figure out how many keys to restrict to.
remainingKeys := maxInt
if args.MaxKeys > 0 {
remainingKeys = args.MaxKeys
}
// Do a do...while pattern to do as many requests as needed.
var results []models.Ds3PutObject
marker := ""
for {
// Build the request.
request := buildRequest(args, remainingKeys, marker)
// Send the request.
response, err := client.GetBucket(request)
if err != nil {
return nil, err
}
// Output the results.
for _, obj := range response.ListBucketResult.Objects {
ds3object := models.Ds3PutObject{Name:*obj.Key, Size:obj.Size}
results = append(results, ds3object)
}
// Subtract the number of keys that we got from the number of keys that
// we need to get.
remainingKeys -= len(response.ListBucketResult.Objects)
// Take note of the next marker to get.
marker = *response.ListBucketResult.NextMarker
// Take care of the do...while.
if response.ListBucketResult.Truncated == false || remainingKeys <= 0 {
break
}
}
return results, nil
}
func buildRequest(args *Arguments, remainingKeys int, marker string) *models.GetBucketRequest {
request := models.NewGetBucketRequest(args.Bucket)
request.WithMaxKeys(getMinInt(remainingKeys, defaultMaxKeys))
if args.KeyPrefix != "" {
request.WithPrefix(args.KeyPrefix)
}
if marker != "" {
request.WithMarker(marker)
}
return request
}