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Jan-Otto KröpkeandClaude Opus 5.5
9c3aa2d977
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>
126 lines
3.1 KiB
Go
126 lines
3.1 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright The Prometheus Authors
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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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//go:build windows
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package registry
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import (
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"bytes"
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"fmt"
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"strconv"
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"sync"
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)
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// CounterNameTable Initialize global name tables
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// profiling, add option to disable name tables if necessary
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// Not sure if we should resolve the names at all or just have the caller do it on demand
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// (for many use cases the index is sufficient)
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//
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//nolint:gochecknoglobals
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var CounterNameTable = QueryNameTable("Counter 009")
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func (p *perfObjectType) LookupName() string {
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return CounterNameTable.LookupString(p.ObjectNameTitleIndex)
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}
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type NameTable struct {
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mu sync.Mutex
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name string
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table struct {
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index map[uint32]string
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string map[string]uint32
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}
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}
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// LookupString returns the name for index. It returns an empty string if the
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// index is unknown or the name table could not be loaded.
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func (t *NameTable) LookupString(index uint32) string {
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if t.load() != nil {
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return ""
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}
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return t.table.index[index]
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}
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// LookupIndex returns the index for str. It returns 0 if the name is unknown
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// or the name table could not be loaded.
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func (t *NameTable) LookupIndex(str string) uint32 {
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if t.load() != nil {
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return 0
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}
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return t.table.string[str]
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}
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// QueryNameTable Query a perflib name table from the v1. Specify the type and the language
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// code (i.e. "Counter 009" or "Help 009") for English language.
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func QueryNameTable(tableName string) *NameTable {
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return &NameTable{
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name: tableName,
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}
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}
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// load reads the name table from the registry. A failed load is retried on the
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// next call, so a transient error does not disable the table for good. The
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// maps are not modified once loaded.
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func (t *NameTable) load() error {
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t.mu.Lock()
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defer t.mu.Unlock()
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if t.table.index != nil {
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return nil
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}
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buffer, err := queryRawData(t.name, nil)
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if err != nil {
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return fmt.Errorf("failed to query perflib name table %q: %w", t.name, err)
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}
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t.table.index, t.table.string = parseNameTable(buffer)
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return nil
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}
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// parseNameTable parses a name table, a REG_MULTI_SZ of alternating index and
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// name strings. Parsing stops at the first incomplete pair.
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func parseNameTable(buffer []byte) (map[uint32]string, map[string]uint32) {
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index := make(map[uint32]string)
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names := make(map[string]uint32)
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r := bytes.NewReader(buffer)
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for {
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indexStr, err := readUTF16String(r)
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if err != nil {
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break
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}
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desc, err := readUTF16String(r)
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if err != nil {
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break
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}
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indexInt, _ := strconv.ParseUint(indexStr, 10, 32)
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index[uint32(indexInt)] = desc
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names[desc] = uint32(indexInt)
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}
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return index, names
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}
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