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b2: Implement server side copy for files > 5GB - fixes #3991

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This factors copy out of SetModTime and Copy so it can be called from
both places.

This also reworks all the multipart uploading to use sync.Errgroup and
memory pooling like the other backends. This makes it more memory
efficient and handle errors better.

See: https://forum.rclone.org/t/copying-files-within-a-b2-bucket/16680/10
This commit is contained in:
Nick Craig-Wood
2020-05-29 12:36:31 +01:00
parent 4c7f7582fd
commit fb61ed8506
3 changed files with 339 additions and 228 deletions
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8
backend/b2/api/types.go
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@@ -337,3 +337,11 @@ type CopyFileRequest struct {
Info map[string]string `json:"fileInfo,omitempty"` // This field stores the metadata that will be stored with the file. (REPLACE only)
DestBucketID string `json:"destinationBucketId,omitempty"` // The destination ID of the bucket if set, if not the source bucket will be used
}
// CopyPartRequest is the request for b2_copy_part - the response is UploadPartResponse
type CopyPartRequest struct {
SourceID string `json:"sourceFileId"` // The ID of the source file being copied.
LargeFileID string `json:"largeFileId"` // The ID of the large file the part will belong to, as returned by b2_start_large_file.
PartNumber int64 `json:"partNumber"` // Which part this is (starting from 1)
Range string `json:"range,omitempty"` // The range of bytes to copy. If not provided, the whole source file will be copied.
}