61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
// Copyright (c) 2017 Couchbase, Inc.
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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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// +build !nommap
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package vellum
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import (
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"os"
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mmap "github.com/edsrzf/mmap-go"
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)
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type mmapWrapper struct {
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f *os.File
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mm mmap.MMap
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}
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func (m *mmapWrapper) Close() (err error) {
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if m.mm != nil {
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err = m.mm.Unmap()
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}
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// try to close file even if unmap failed
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if m.f != nil {
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err2 := m.f.Close()
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if err == nil {
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// try to return first error
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err = err2
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}
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}
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return
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}
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func open(path string) (*FST, error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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mm, err := mmap.Map(f, mmap.RDONLY, 0)
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if err != nil {
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// mmap failed, try to close the file
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_ = f.Close()
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return nil, err
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}
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return new(mm, &mmapWrapper{
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f: f,
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mm: mm,
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})
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}
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