299e856736
Update module prometheus/client_golang to v1.6.0 Reviewed-on: https://kolaente.dev/vikunja/api/pulls/463
768 lines
21 KiB
Go
768 lines
21 KiB
Go
// Copyright 2018 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 protoregistry provides data structures to register and lookup
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// protobuf descriptor types.
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//
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// The Files registry contains file descriptors and provides the ability
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// to iterate over the files or lookup a specific descriptor within the files.
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// Files only contains protobuf descriptors and has no understanding of Go
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// type information that may be associated with each descriptor.
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//
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// The Types registry contains descriptor types for which there is a known
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// Go type associated with that descriptor. It provides the ability to iterate
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// over the registered types or lookup a type by name.
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package protoregistry
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import (
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"fmt"
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"log"
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"strings"
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"sync"
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"google.golang.org/protobuf/internal/errors"
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"google.golang.org/protobuf/reflect/protoreflect"
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)
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// ignoreConflict reports whether to ignore a registration conflict
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// given the descriptor being registered and the error.
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// It is a variable so that the behavior is easily overridden in another file.
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var ignoreConflict = func(d protoreflect.Descriptor, err error) bool {
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log.Printf(""+
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"WARNING: %v\n"+
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"A future release will panic on registration conflicts. See:\n"+
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"https://developers.google.com/protocol-buffers/docs/reference/go/faq#namespace-conflict\n"+
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"\n", err)
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return true
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}
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var globalMutex sync.RWMutex
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// GlobalFiles is a global registry of file descriptors.
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var GlobalFiles *Files = new(Files)
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// GlobalTypes is the registry used by default for type lookups
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// unless a local registry is provided by the user.
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var GlobalTypes *Types = new(Types)
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// NotFound is a sentinel error value to indicate that the type was not found.
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//
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// Since registry lookup can happen in the critical performance path, resolvers
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// must return this exact error value, not an error wrapping it.
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var NotFound = errors.New("not found")
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// Files is a registry for looking up or iterating over files and the
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// descriptors contained within them.
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// The Find and Range methods are safe for concurrent use.
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type Files struct {
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// The map of descsByName contains:
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// EnumDescriptor
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// EnumValueDescriptor
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// MessageDescriptor
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// ExtensionDescriptor
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// ServiceDescriptor
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// *packageDescriptor
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//
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// Note that files are stored as a slice, since a package may contain
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// multiple files. Only top-level declarations are registered.
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// Note that enum values are in the top-level since that are in the same
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// scope as the parent enum.
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descsByName map[protoreflect.FullName]interface{}
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filesByPath map[string]protoreflect.FileDescriptor
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}
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type packageDescriptor struct {
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files []protoreflect.FileDescriptor
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}
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// RegisterFile registers the provided file descriptor.
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//
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// If any descriptor within the file conflicts with the descriptor of any
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// previously registered file (e.g., two enums with the same full name),
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// then the file is not registered and an error is returned.
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//
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// It is permitted for multiple files to have the same file path.
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func (r *Files) RegisterFile(file protoreflect.FileDescriptor) error {
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if r == GlobalFiles {
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globalMutex.Lock()
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defer globalMutex.Unlock()
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}
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if r.descsByName == nil {
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r.descsByName = map[protoreflect.FullName]interface{}{
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"": &packageDescriptor{},
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}
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r.filesByPath = make(map[string]protoreflect.FileDescriptor)
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}
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path := file.Path()
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if prev := r.filesByPath[path]; prev != nil {
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err := errors.New("file %q is already registered", file.Path())
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err = amendErrorWithCaller(err, prev, file)
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if r == GlobalFiles && ignoreConflict(file, err) {
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err = nil
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}
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return err
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}
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for name := file.Package(); name != ""; name = name.Parent() {
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switch prev := r.descsByName[name]; prev.(type) {
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case nil, *packageDescriptor:
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default:
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err := errors.New("file %q has a package name conflict over %v", file.Path(), name)
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err = amendErrorWithCaller(err, prev, file)
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if r == GlobalFiles && ignoreConflict(file, err) {
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err = nil
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}
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return err
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}
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}
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var err error
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var hasConflict bool
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rangeTopLevelDescriptors(file, func(d protoreflect.Descriptor) {
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if prev := r.descsByName[d.FullName()]; prev != nil {
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hasConflict = true
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err = errors.New("file %q has a name conflict over %v", file.Path(), d.FullName())
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err = amendErrorWithCaller(err, prev, file)
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if r == GlobalFiles && ignoreConflict(d, err) {
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err = nil
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}
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}
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})
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if hasConflict {
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return err
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}
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for name := file.Package(); name != ""; name = name.Parent() {
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if r.descsByName[name] == nil {
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r.descsByName[name] = &packageDescriptor{}
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}
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}
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p := r.descsByName[file.Package()].(*packageDescriptor)
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p.files = append(p.files, file)
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rangeTopLevelDescriptors(file, func(d protoreflect.Descriptor) {
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r.descsByName[d.FullName()] = d
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})
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r.filesByPath[path] = file
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return nil
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}
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// FindDescriptorByName looks up a descriptor by the full name.
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//
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// This returns (nil, NotFound) if not found.
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func (r *Files) FindDescriptorByName(name protoreflect.FullName) (protoreflect.Descriptor, error) {
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if r == nil {
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return nil, NotFound
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}
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if r == GlobalFiles {
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globalMutex.RLock()
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defer globalMutex.RUnlock()
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}
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prefix := name
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suffix := nameSuffix("")
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for prefix != "" {
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if d, ok := r.descsByName[prefix]; ok {
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switch d := d.(type) {
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case protoreflect.EnumDescriptor:
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if d.FullName() == name {
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return d, nil
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}
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case protoreflect.EnumValueDescriptor:
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if d.FullName() == name {
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return d, nil
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}
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case protoreflect.MessageDescriptor:
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if d.FullName() == name {
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return d, nil
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}
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if d := findDescriptorInMessage(d, suffix); d != nil && d.FullName() == name {
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return d, nil
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}
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case protoreflect.ExtensionDescriptor:
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if d.FullName() == name {
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return d, nil
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}
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case protoreflect.ServiceDescriptor:
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if d.FullName() == name {
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return d, nil
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}
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if d := d.Methods().ByName(suffix.Pop()); d != nil && d.FullName() == name {
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return d, nil
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}
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}
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return nil, NotFound
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}
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prefix = prefix.Parent()
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suffix = nameSuffix(name[len(prefix)+len("."):])
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}
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return nil, NotFound
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}
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func findDescriptorInMessage(md protoreflect.MessageDescriptor, suffix nameSuffix) protoreflect.Descriptor {
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name := suffix.Pop()
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if suffix == "" {
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if ed := md.Enums().ByName(name); ed != nil {
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return ed
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}
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for i := md.Enums().Len() - 1; i >= 0; i-- {
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if vd := md.Enums().Get(i).Values().ByName(name); vd != nil {
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return vd
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}
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}
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if xd := md.Extensions().ByName(name); xd != nil {
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return xd
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}
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if fd := md.Fields().ByName(name); fd != nil {
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return fd
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}
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if od := md.Oneofs().ByName(name); od != nil {
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return od
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}
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}
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if md := md.Messages().ByName(name); md != nil {
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if suffix == "" {
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return md
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}
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return findDescriptorInMessage(md, suffix)
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}
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return nil
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}
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type nameSuffix string
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func (s *nameSuffix) Pop() (name protoreflect.Name) {
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if i := strings.IndexByte(string(*s), '.'); i >= 0 {
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name, *s = protoreflect.Name((*s)[:i]), (*s)[i+1:]
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} else {
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name, *s = protoreflect.Name((*s)), ""
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}
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return name
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}
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// FindFileByPath looks up a file by the path.
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//
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// This returns (nil, NotFound) if not found.
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func (r *Files) FindFileByPath(path string) (protoreflect.FileDescriptor, error) {
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if r == nil {
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return nil, NotFound
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}
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if r == GlobalFiles {
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globalMutex.RLock()
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defer globalMutex.RUnlock()
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}
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if fd, ok := r.filesByPath[path]; ok {
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return fd, nil
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}
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return nil, NotFound
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}
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// NumFiles reports the number of registered files.
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func (r *Files) NumFiles() int {
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if r == nil {
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return 0
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}
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if r == GlobalFiles {
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globalMutex.RLock()
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defer globalMutex.RUnlock()
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}
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return len(r.filesByPath)
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}
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// RangeFiles iterates over all registered files while f returns true.
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// The iteration order is undefined.
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func (r *Files) RangeFiles(f func(protoreflect.FileDescriptor) bool) {
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if r == nil {
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return
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}
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if r == GlobalFiles {
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globalMutex.RLock()
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defer globalMutex.RUnlock()
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}
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for _, file := range r.filesByPath {
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if !f(file) {
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return
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}
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}
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}
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// NumFilesByPackage reports the number of registered files in a proto package.
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func (r *Files) NumFilesByPackage(name protoreflect.FullName) int {
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if r == nil {
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return 0
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}
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if r == GlobalFiles {
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globalMutex.RLock()
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defer globalMutex.RUnlock()
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}
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p, ok := r.descsByName[name].(*packageDescriptor)
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if !ok {
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return 0
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}
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return len(p.files)
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}
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// RangeFilesByPackage iterates over all registered files in a given proto package
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// while f returns true. The iteration order is undefined.
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func (r *Files) RangeFilesByPackage(name protoreflect.FullName, f func(protoreflect.FileDescriptor) bool) {
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if r == nil {
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return
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}
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if r == GlobalFiles {
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globalMutex.RLock()
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defer globalMutex.RUnlock()
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}
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p, ok := r.descsByName[name].(*packageDescriptor)
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if !ok {
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return
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}
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for _, file := range p.files {
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if !f(file) {
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return
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}
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}
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}
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// rangeTopLevelDescriptors iterates over all top-level descriptors in a file
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// which will be directly entered into the registry.
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func rangeTopLevelDescriptors(fd protoreflect.FileDescriptor, f func(protoreflect.Descriptor)) {
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eds := fd.Enums()
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for i := eds.Len() - 1; i >= 0; i-- {
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f(eds.Get(i))
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vds := eds.Get(i).Values()
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for i := vds.Len() - 1; i >= 0; i-- {
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f(vds.Get(i))
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}
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}
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mds := fd.Messages()
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for i := mds.Len() - 1; i >= 0; i-- {
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f(mds.Get(i))
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}
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xds := fd.Extensions()
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for i := xds.Len() - 1; i >= 0; i-- {
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f(xds.Get(i))
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}
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sds := fd.Services()
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for i := sds.Len() - 1; i >= 0; i-- {
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f(sds.Get(i))
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}
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}
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// MessageTypeResolver is an interface for looking up messages.
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//
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// A compliant implementation must deterministically return the same type
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// if no error is encountered.
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//
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// The Types type implements this interface.
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type MessageTypeResolver interface {
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// FindMessageByName looks up a message by its full name.
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// E.g., "google.protobuf.Any"
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//
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// This return (nil, NotFound) if not found.
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FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error)
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// FindMessageByURL looks up a message by a URL identifier.
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// See documentation on google.protobuf.Any.type_url for the URL format.
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//
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// This returns (nil, NotFound) if not found.
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FindMessageByURL(url string) (protoreflect.MessageType, error)
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}
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// ExtensionTypeResolver is an interface for looking up extensions.
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//
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// A compliant implementation must deterministically return the same type
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// if no error is encountered.
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//
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// The Types type implements this interface.
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type ExtensionTypeResolver interface {
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// FindExtensionByName looks up a extension field by the field's full name.
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// Note that this is the full name of the field as determined by
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// where the extension is declared and is unrelated to the full name of the
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// message being extended.
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//
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// This returns (nil, NotFound) if not found.
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FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error)
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// FindExtensionByNumber looks up a extension field by the field number
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// within some parent message, identified by full name.
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//
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// This returns (nil, NotFound) if not found.
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FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error)
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}
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var (
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_ MessageTypeResolver = (*Types)(nil)
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_ ExtensionTypeResolver = (*Types)(nil)
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)
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// Types is a registry for looking up or iterating over descriptor types.
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// The Find and Range methods are safe for concurrent use.
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type Types struct {
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typesByName typesByName
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extensionsByMessage extensionsByMessage
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numEnums int
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numMessages int
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numExtensions int
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}
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type (
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typesByName map[protoreflect.FullName]interface{}
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extensionsByMessage map[protoreflect.FullName]extensionsByNumber
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extensionsByNumber map[protoreflect.FieldNumber]protoreflect.ExtensionType
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)
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// RegisterMessage registers the provided message type.
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//
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// If a naming conflict occurs, the type is not registered and an error is returned.
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func (r *Types) RegisterMessage(mt protoreflect.MessageType) error {
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// Under rare circumstances getting the descriptor might recursively
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// examine the registry, so fetch it before locking.
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md := mt.Descriptor()
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if r == GlobalTypes {
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globalMutex.Lock()
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defer globalMutex.Unlock()
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}
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if err := r.register("message", md, mt); err != nil {
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return err
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}
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r.numMessages++
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return nil
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}
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// RegisterEnum registers the provided enum type.
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//
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// If a naming conflict occurs, the type is not registered and an error is returned.
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func (r *Types) RegisterEnum(et protoreflect.EnumType) error {
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// Under rare circumstances getting the descriptor might recursively
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// examine the registry, so fetch it before locking.
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ed := et.Descriptor()
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if r == GlobalTypes {
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globalMutex.Lock()
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defer globalMutex.Unlock()
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}
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if err := r.register("enum", ed, et); err != nil {
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return err
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}
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r.numEnums++
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return nil
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}
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// RegisterExtension registers the provided extension type.
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//
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// If a naming conflict occurs, the type is not registered and an error is returned.
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func (r *Types) RegisterExtension(xt protoreflect.ExtensionType) error {
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// Under rare circumstances getting the descriptor might recursively
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// examine the registry, so fetch it before locking.
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//
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// A known case where this can happen: Fetching the TypeDescriptor for a
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// legacy ExtensionDesc can consult the global registry.
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xd := xt.TypeDescriptor()
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if r == GlobalTypes {
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globalMutex.Lock()
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defer globalMutex.Unlock()
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}
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field := xd.Number()
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message := xd.ContainingMessage().FullName()
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if prev := r.extensionsByMessage[message][field]; prev != nil {
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err := errors.New("extension number %d is already registered on message %v", field, message)
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err = amendErrorWithCaller(err, prev, xt)
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if !(r == GlobalTypes && ignoreConflict(xd, err)) {
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return err
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}
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}
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if err := r.register("extension", xd, xt); err != nil {
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return err
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}
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if r.extensionsByMessage == nil {
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r.extensionsByMessage = make(extensionsByMessage)
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}
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if r.extensionsByMessage[message] == nil {
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r.extensionsByMessage[message] = make(extensionsByNumber)
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}
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r.extensionsByMessage[message][field] = xt
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r.numExtensions++
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return nil
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}
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func (r *Types) register(kind string, desc protoreflect.Descriptor, typ interface{}) error {
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name := desc.FullName()
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prev := r.typesByName[name]
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if prev != nil {
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err := errors.New("%v %v is already registered", kind, name)
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err = amendErrorWithCaller(err, prev, typ)
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if !(r == GlobalTypes && ignoreConflict(desc, err)) {
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return err
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}
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}
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if r.typesByName == nil {
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r.typesByName = make(typesByName)
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}
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r.typesByName[name] = typ
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return nil
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}
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|
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// FindEnumByName looks up an enum by its full name.
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// E.g., "google.protobuf.Field.Kind".
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//
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// This returns (nil, NotFound) if not found.
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func (r *Types) FindEnumByName(enum protoreflect.FullName) (protoreflect.EnumType, error) {
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if r == nil {
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return nil, NotFound
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}
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if r == GlobalTypes {
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globalMutex.RLock()
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defer globalMutex.RUnlock()
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}
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if v := r.typesByName[enum]; v != nil {
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if et, _ := v.(protoreflect.EnumType); et != nil {
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return et, nil
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}
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return nil, errors.New("found wrong type: got %v, want enum", typeName(v))
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}
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return nil, NotFound
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}
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|
|
// FindMessageByName looks up a message by its full name.
|
|
// E.g., "google.protobuf.Any"
|
|
//
|
|
// This return (nil, NotFound) if not found.
|
|
func (r *Types) FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error) {
|
|
// The full name by itself is a valid URL.
|
|
return r.FindMessageByURL(string(message))
|
|
}
|
|
|
|
// FindMessageByURL looks up a message by a URL identifier.
|
|
// See documentation on google.protobuf.Any.type_url for the URL format.
|
|
//
|
|
// This returns (nil, NotFound) if not found.
|
|
func (r *Types) FindMessageByURL(url string) (protoreflect.MessageType, error) {
|
|
if r == nil {
|
|
return nil, NotFound
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
message := protoreflect.FullName(url)
|
|
if i := strings.LastIndexByte(url, '/'); i >= 0 {
|
|
message = message[i+len("/"):]
|
|
}
|
|
|
|
if v := r.typesByName[message]; v != nil {
|
|
if mt, _ := v.(protoreflect.MessageType); mt != nil {
|
|
return mt, nil
|
|
}
|
|
return nil, errors.New("found wrong type: got %v, want message", typeName(v))
|
|
}
|
|
return nil, NotFound
|
|
}
|
|
|
|
// FindExtensionByName looks up a extension field by the field's full name.
|
|
// Note that this is the full name of the field as determined by
|
|
// where the extension is declared and is unrelated to the full name of the
|
|
// message being extended.
|
|
//
|
|
// This returns (nil, NotFound) if not found.
|
|
func (r *Types) FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error) {
|
|
if r == nil {
|
|
return nil, NotFound
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
if v := r.typesByName[field]; v != nil {
|
|
if xt, _ := v.(protoreflect.ExtensionType); xt != nil {
|
|
return xt, nil
|
|
}
|
|
return nil, errors.New("found wrong type: got %v, want extension", typeName(v))
|
|
}
|
|
return nil, NotFound
|
|
}
|
|
|
|
// FindExtensionByNumber looks up a extension field by the field number
|
|
// within some parent message, identified by full name.
|
|
//
|
|
// This returns (nil, NotFound) if not found.
|
|
func (r *Types) FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) {
|
|
if r == nil {
|
|
return nil, NotFound
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
if xt, ok := r.extensionsByMessage[message][field]; ok {
|
|
return xt, nil
|
|
}
|
|
return nil, NotFound
|
|
}
|
|
|
|
// NumEnums reports the number of registered enums.
|
|
func (r *Types) NumEnums() int {
|
|
if r == nil {
|
|
return 0
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
return r.numEnums
|
|
}
|
|
|
|
// RangeEnums iterates over all registered enums while f returns true.
|
|
// Iteration order is undefined.
|
|
func (r *Types) RangeEnums(f func(protoreflect.EnumType) bool) {
|
|
if r == nil {
|
|
return
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
for _, typ := range r.typesByName {
|
|
if et, ok := typ.(protoreflect.EnumType); ok {
|
|
if !f(et) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// NumMessages reports the number of registered messages.
|
|
func (r *Types) NumMessages() int {
|
|
if r == nil {
|
|
return 0
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
return r.numMessages
|
|
}
|
|
|
|
// RangeMessages iterates over all registered messages while f returns true.
|
|
// Iteration order is undefined.
|
|
func (r *Types) RangeMessages(f func(protoreflect.MessageType) bool) {
|
|
if r == nil {
|
|
return
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
for _, typ := range r.typesByName {
|
|
if mt, ok := typ.(protoreflect.MessageType); ok {
|
|
if !f(mt) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// NumExtensions reports the number of registered extensions.
|
|
func (r *Types) NumExtensions() int {
|
|
if r == nil {
|
|
return 0
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
return r.numExtensions
|
|
}
|
|
|
|
// RangeExtensions iterates over all registered extensions while f returns true.
|
|
// Iteration order is undefined.
|
|
func (r *Types) RangeExtensions(f func(protoreflect.ExtensionType) bool) {
|
|
if r == nil {
|
|
return
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
for _, typ := range r.typesByName {
|
|
if xt, ok := typ.(protoreflect.ExtensionType); ok {
|
|
if !f(xt) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// NumExtensionsByMessage reports the number of registered extensions for
|
|
// a given message type.
|
|
func (r *Types) NumExtensionsByMessage(message protoreflect.FullName) int {
|
|
if r == nil {
|
|
return 0
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
return len(r.extensionsByMessage[message])
|
|
}
|
|
|
|
// RangeExtensionsByMessage iterates over all registered extensions filtered
|
|
// by a given message type while f returns true. Iteration order is undefined.
|
|
func (r *Types) RangeExtensionsByMessage(message protoreflect.FullName, f func(protoreflect.ExtensionType) bool) {
|
|
if r == nil {
|
|
return
|
|
}
|
|
if r == GlobalTypes {
|
|
globalMutex.RLock()
|
|
defer globalMutex.RUnlock()
|
|
}
|
|
for _, xt := range r.extensionsByMessage[message] {
|
|
if !f(xt) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func typeName(t interface{}) string {
|
|
switch t.(type) {
|
|
case protoreflect.EnumType:
|
|
return "enum"
|
|
case protoreflect.MessageType:
|
|
return "message"
|
|
case protoreflect.ExtensionType:
|
|
return "extension"
|
|
default:
|
|
return fmt.Sprintf("%T", t)
|
|
}
|
|
}
|
|
|
|
func amendErrorWithCaller(err error, prev, curr interface{}) error {
|
|
prevPkg := goPackage(prev)
|
|
currPkg := goPackage(curr)
|
|
if prevPkg == "" || currPkg == "" || prevPkg == currPkg {
|
|
return err
|
|
}
|
|
return errors.New("%s\n\tpreviously from: %q\n\tcurrently from: %q", err, prevPkg, currPkg)
|
|
}
|
|
|
|
func goPackage(v interface{}) string {
|
|
switch d := v.(type) {
|
|
case protoreflect.EnumType:
|
|
v = d.Descriptor()
|
|
case protoreflect.MessageType:
|
|
v = d.Descriptor()
|
|
case protoreflect.ExtensionType:
|
|
v = d.TypeDescriptor()
|
|
}
|
|
if d, ok := v.(protoreflect.Descriptor); ok {
|
|
v = d.ParentFile()
|
|
}
|
|
if d, ok := v.(interface{ GoPackagePath() string }); ok {
|
|
return d.GoPackagePath()
|
|
}
|
|
return ""
|
|
}
|