mirror of
https://github.com/apple/foundationdb.git
synced 2025-05-14 18:02:31 +08:00
88d8242bb6
Currently ApiVersion is scattered and hardcoded across the bindings. Let's at least clean it up so it's once per file or less and use some redirection against FDB_API_VERSION or API_VERSION.
106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
/*
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* blob.go
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"fmt"
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"github.com/apple/foundationdb/bindings/go/src/fdb"
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"github.com/apple/foundationdb/bindings/go/src/fdb/directory"
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"github.com/apple/foundationdb/bindings/go/src/fdb/subspace"
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"github.com/apple/foundationdb/bindings/go/src/fdb/tuple"
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)
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const API_VERSION int = 720
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const CHUNK_SIZE int = 5
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func write_blob(t fdb.Transactor, blob_subspace subspace.Subspace, blob []byte) (err error) {
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_, err = t.Transact(func(tr fdb.Transaction) (interface{}, error) {
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if len(blob) == 0 {
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return nil, nil
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}
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for i := 0; i < len(blob); i += CHUNK_SIZE {
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if i+CHUNK_SIZE <= len(blob) {
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tr.Set(blob_subspace.Pack(tuple.Tuple{i}), blob[i:i+CHUNK_SIZE])
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} else {
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tr.Set(blob_subspace.Pack(tuple.Tuple{i}), blob[i:])
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}
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}
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return nil, nil
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})
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return
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}
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func read_blob(t fdb.ReadTransactor, blob_subspace subspace.Subspace) ([]byte, error) {
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blb, err := t.ReadTransact(func(rtr fdb.ReadTransaction) (interface{}, error) {
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var blob []byte
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ri := rtr.GetRange(blob_subspace, fdb.RangeOptions{}).Iterator()
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for ri.Advance() {
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kv := ri.MustGet()
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blob = append(blob, rtr.Get(kv.Key).MustGet()...)
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}
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return blob, nil
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})
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if err != nil {
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return nil, err
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}
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return blb.([]byte), nil
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}
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func main() {
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fdb.MustAPIVersion(API_VERSION)
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db := fdb.MustOpenDefault()
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blobdir, err := directory.CreateOrOpen(db, []string{"blobdir"}, nil)
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if err != nil {
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fmt.Println(err)
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}
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blobspace := blobdir.Sub("blob")
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test := []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
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write_blob(db, blobspace, test)
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ret, e := read_blob(db, blobspace)
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if e == nil {
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fmt.Println(string(ret))
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}
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}
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