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https://github.com/golang/go
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dfcf57064e
This change consolidates the FileKind into only the FileHandle. Previously, it had been set in multiple places, which required users to pass in a FileKind when fetching a file. This resulted in confusion, particularly in places when users did not have access to the file kind. Change-Id: I9e07d7320c46a21d453ffe108d1431a615706a71 Reviewed-on: https://go-review.googlesource.com/c/tools/+/213459 Run-TryBot: Rebecca Stambler <rstambler@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Heschi Kreinick <heschi@google.com>
68 lines
1.8 KiB
Go
68 lines
1.8 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) source.FileHandle {
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identifier := "DOES NOT EXIST"
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if fi, err := os.Stat(uri.Filename()); err == nil {
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identifier = fi.ModTime().String()
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}
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kind := source.DetectLanguage("", uri.Filename())
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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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Identifier: identifier,
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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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_ = ctx
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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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