mirror of
https://github.com/golang/go
synced 2024-10-01 05:28:33 -06:00
0f9bb8f614
Currently, we cache source.CheckPackageHandles for each file and package that we are aware of, as well as dependencies. This is not necessary, since the active packages pin their imports in memory. Change-Id: Ia0101f4d4a2d36d5baeb890af3d7c8baec297847 Reviewed-on: https://go-review.googlesource.com/c/tools/+/196982 Run-TryBot: Rebecca Stambler <rstambler@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Cottrell <iancottrell@google.com>
66 lines
1.7 KiB
Go
66 lines
1.7 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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"context"
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"io/ioutil"
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"os"
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"golang.org/x/tools/internal/lsp/source"
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"golang.org/x/tools/internal/lsp/telemetry"
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"golang.org/x/tools/internal/span"
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"golang.org/x/tools/internal/telemetry/trace"
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)
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// ioLimit limits the number of parallel file reads per process.
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var ioLimit = make(chan struct{}, 128)
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// nativeFileSystem implements FileSystem reading from the normal os file system.
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type nativeFileSystem struct{}
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// nativeFileHandle implements FileHandle for nativeFileSystem
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type nativeFileHandle struct {
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fs *nativeFileSystem
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identity source.FileIdentity
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}
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func (fs *nativeFileSystem) GetFile(uri span.URI, kind source.FileKind) source.FileHandle {
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version := "DOES NOT EXIST"
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if fi, err := os.Stat(uri.Filename()); err == nil {
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version = fi.ModTime().String()
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}
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return &nativeFileHandle{
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fs: fs,
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identity: source.FileIdentity{
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URI: uri,
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Version: version,
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Kind: kind,
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},
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}
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}
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func (h *nativeFileHandle) FileSystem() source.FileSystem {
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return h.fs
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}
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func (h *nativeFileHandle) Identity() source.FileIdentity {
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return h.identity
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}
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func (h *nativeFileHandle) Read(ctx context.Context) ([]byte, string, error) {
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ctx, done := trace.StartSpan(ctx, "cache.nativeFileHandle.Read", telemetry.File.Of(h.identity.URI.Filename()))
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defer done()
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ioLimit <- struct{}{}
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defer func() { <-ioLimit }()
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// TODO: this should fail if the version is not the same as the handle
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data, err := ioutil.ReadFile(h.identity.URI.Filename())
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if err != nil {
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return nil, "", err
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}
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return data, hashContents(data), nil
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}
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