Refactor blockchain code into separate files (no code changes).

blockchain/Blockchain File.go

@@ -0,0 +1,85 @@
+/*
+File Name:  Blockchain File.go
+Copyright:  2021 Peernet s.r.o.
+Author:     Peter Kleissner
+*/
+
+package blockchain
+
+import (
+	"bytes"
+
+	"github.com/google/uuid"
+)
+
+// AddFiles adds files to the blockchain. Status is BlockchainStatusX.
+// It makes sense to group all files in the same directory into one call, since only one directory record will be created per unique directory per block.
+func (blockchain *Blockchain) AddFiles(files []BlockRecordFile) (newHeight, newVersion uint64, status int) {
+	encoded, err := encodeBlockRecordFiles(files)
+	if err != nil {
+		return 0, 0, BlockchainStatusCorruptBlockRecord
+	}
+
+	return blockchain.Append(encoded)
+}
+
+// ListFiles returns a list of all files. Status is BlockchainStatusX.
+// If there is a corruption in the blockchain it will stop reading but return the files parsed so far.
+func (blockchain *Blockchain) ListFiles() (files []BlockRecordFile, status int) {
+	status = blockchain.Iterate(func(block *Block) (statusI int) {
+		filesMore, err := decodeBlockRecordFiles(block.RecordsRaw, block.NodeID)
+		if err != nil {
+			return BlockchainStatusCorruptBlockRecord
+		}
+		files = append(files, filesMore...)
+
+		return BlockchainStatusOK
+	})
+
+	return files, status
+}
+
+// FileExists checks if the file (identified via its hash) exists.
+// If there is a corruption in the blockchain it will stop reading but return the files found so far.
+func (blockchain *Blockchain) FileExists(hash []byte) (files []BlockRecordFile, status int) {
+	status = blockchain.Iterate(func(block *Block) (statusI int) {
+		filesD, err := decodeBlockRecordFiles(block.RecordsRaw, block.NodeID)
+		if err != nil {
+			return BlockchainStatusCorruptBlockRecord
+		}
+		for _, file := range filesD {
+			if bytes.Equal(file.Hash, hash) {
+				files = append(files, file)
+			}
+		}
+
+		return BlockchainStatusOK
+	})
+
+	return files, status
+}
+
+// DeleteFiles deletes files from the blockchain. Status is BlockchainStatusX.
+func (blockchain *Blockchain) DeleteFiles(IDs []uuid.UUID) (newHeight, newVersion uint64, deletedFiles []BlockRecordFile, status int) {
+	newHeight, newVersion, status = blockchain.IterateDeleteRecord(func(record *BlockRecordRaw) (deleteAction int) {
+		if record.Type != RecordTypeFile {
+			return 0 // no action on record
+		}
+
+		filesDecoded, err := decodeBlockRecordFiles([]BlockRecordRaw{*record}, nil)
+		if err != nil || len(filesDecoded) != 1 {
+			return 3 // error blockchain corrupt
+		}
+
+		for _, id := range IDs {
+			if id == filesDecoded[0].ID { // found a file ID to delete?
+				deletedFiles = append(deletedFiles, filesDecoded[0])
+				return 1 // delete record
+			}
+		}
+
+		return 0 // no action on record
+	})
+
+	return
+}