mirror of
https://github.com/golang/go
synced 2024-10-01 07:28:35 -06:00
2c3de6a5ae
We split aquiring a "handle" from reading a files contents so that we can do the former eagerly and the latter lazily. We also "version" the handles so that the same file at different versions is a different handle. Change-Id: I06cc346d4b4c77d784aa454702c54689f2f177e0 Reviewed-on: https://go-review.googlesource.com/c/tools/+/179917 Reviewed-by: Rebecca Stambler <rstambler@golang.org>
70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cache
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import (
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"crypto/sha1"
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"fmt"
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"go/token"
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"strconv"
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"sync/atomic"
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"golang.org/x/tools/internal/lsp/debug"
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"golang.org/x/tools/internal/lsp/source"
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"golang.org/x/tools/internal/lsp/xlog"
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"golang.org/x/tools/internal/span"
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)
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func New() source.Cache {
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index := atomic.AddInt64(&cacheIndex, 1)
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c := &cache{
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fs: &nativeFileSystem{},
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id: strconv.FormatInt(index, 10),
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fset: token.NewFileSet(),
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}
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debug.AddCache(debugCache{c})
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return c
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}
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type cache struct {
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fs source.FileSystem
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id string
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fset *token.FileSet
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}
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func (c *cache) GetFile(uri span.URI) source.FileHandle {
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return c.fs.GetFile(uri)
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}
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func (c *cache) NewSession(log xlog.Logger) source.Session {
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index := atomic.AddInt64(&sessionIndex, 1)
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s := &session{
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cache: c,
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id: strconv.FormatInt(index, 10),
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log: log,
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overlays: make(map[span.URI]*overlay),
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filesWatchMap: NewWatchMap(),
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}
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debug.AddSession(debugSession{s})
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return s
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}
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func (c *cache) FileSet() *token.FileSet {
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return c.fset
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}
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func hashContents(contents []byte) string {
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// TODO: consider whether sha1 is the best choice here
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// This hash is used for internal identity detection only
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return fmt.Sprintf("%x", sha1.Sum(contents))
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}
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var cacheIndex, sessionIndex, viewIndex int64
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type debugCache struct{ *cache }
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func (c *cache) ID() string { return c.id }
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func (c debugCache) FileSet() *token.FileSet { return c.fset }
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