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client_proto.go
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/
client_proto.go
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package schema_registry
import (
"bytes"
"context"
"crypto/sha256"
"encoding/base64"
"fmt"
"github.com/golang/protobuf/jsonpb"
"github.com/golang/protobuf/proto"
"github.com/jhump/protoreflect/desc"
"github.com/jhump/protoreflect/desc/builder"
"github.com/jhump/protoreflect/desc/protoparse"
"github.com/jhump/protoreflect/desc/protoprint"
"google.golang.org/protobuf/reflect/protodesc"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
"google.golang.org/protobuf/types/descriptorpb"
"google.golang.org/protobuf/types/dynamicpb"
"io"
"io/ioutil"
"log"
"strings"
)
func (c *Client) RegisterProtobufType(ctx context.Context, subject string, protoType protoreflect.Message) (uint32, error) {
if id, ok := c.cacheProto[protoType.Type()]; ok {
return id, nil
}
md := protoType.Descriptor()
refs, err := c.registerReferencedProtoSchemas(ctx, md.ParentFile())
if err != nil {
return 0, fmt.Errorf("RegisterProtobufType.registerReferencedProtoSchemas: %v", err)
}
parentFileSchema, err := NewProtobufSchema(md.ParentFile())
if err != nil {
return 0, fmt.Errorf("RegisterProtobufType.NewProtobufSchema: %v", err)
}
b := builder.NewFile(fmt.Sprintf("%v", md.ParentFile().Path())).
SetPackageName(parentFileSchema.definition.GetPackage()).
SetProto3(parentFileSchema.definition.IsProto3())
msg := parentFileSchema.definition.FindMessage(string(md.FullName()))
if msg == nil {
return 0, fmt.Errorf("RegisterProtobufType.FindMessage: not found: %s", md.FullName())
}
err = c.addMessage(b, msg)
if err != nil {
return 0, fmt.Errorf("RegisterProtobufType.addMessage: not found: %s", md.FullName())
}
f, err := b.Build()
if err != nil {
return 0, fmt.Errorf("RegisterProtobufType.Build: %v", err)
}
fd := f.AsFileDescriptorProto()
if c.config.LogEntities() {
m := &jsonpb.Marshaler{Indent: " "}
s, _ := m.MarshalToString(fd)
log.Println(s)
}
pfd, err := protodesc.NewFile(fd, c.resolverWithReferences(ctx, refs))
if err != nil {
return 0, fmt.Errorf("RegisterProtobufType.NewFile: %v", err)
}
//verify that the first type defined in the resultant schema is the requested to be registered
primaryType := pfd.Messages().Get(0)
if primaryType.FullName() != protoType.Descriptor().FullName() {
return 0, fmt.Errorf("registration of proto message %v resulted in a definition with primary message %v",
protoType.Descriptor().FullName(), primaryType.FullName())
}
schema := &ProtobufSchema{definition: f, descriptor: pfd}
body, err := schema.Render()
if err != nil {
return 0, err
}
id, err := c.registerSchemaUnderSubject(ctx, subject, schemaTypeProtobuf, body, refs)
if err != nil {
return 0, err
}
c.cacheProto[protoType.Type()] = id
if c.config.LogCaches() {
log.Println("schema_registry_client", "cached schema id", id, protoType.Type())
}
return id, nil
}
func (c *Client) addMessage(b *builder.FileBuilder, d *desc.MessageDescriptor) error {
messages := make([]*builder.MessageBuilder, 0)
defined := func (name string) *builder.MessageBuilder {
for _, m := range messages {
if m.GetName() == name {
return m
}
}
return nil
}
var process func(field *desc.FieldDescriptor, enums []*builder.EnumBuilder) (*builder.FieldBuilder, error)
traverse := func(msg *desc.MessageDescriptor) (*builder.MessageBuilder, error) {
m := defined(msg.GetName())
if m != nil {
return m, nil
}
m = builder.NewMessage(msg.GetName())
messages = append(messages, m)
var enums []*builder.EnumBuilder
for _, enum := range msg.GetNestedEnumTypes() {
eb := builder.NewEnum(enum.GetName())
for _, evb := range enum.GetValues() {
eb.AddValue(builder.NewEnumValue(evb.GetName()).SetNumber(evb.GetNumber()))
}
enums = append(enums, eb)
m.AddNestedEnum(eb)
}
//TODO msg.GetNestedMessageTypes()
for _, field := range msg.GetFields() {
f, err := process(field, enums)
if err != nil {
return nil, err
}
m.AddField(f)
}
return m, nil
}
process = func(field *desc.FieldDescriptor, enums []*builder.EnumBuilder) (*builder.FieldBuilder, error) {
clone := func(src *desc.FieldDescriptor, dst *builder.FieldBuilder) {
if src.IsRepeated() {
dst.SetRepeated()
}
if src.IsRequired() {
dst.SetRepeated()
}
if src.IsProto3Optional() {
dst.SetProto3Optional(true)
}
dst.SetJsonName(src.GetJSONName())
dst.SetLabel(src.GetLabel())
dst.SetNumber(src.GetNumber())
dst.SetOptions(src.GetFieldOptions())
}
if field.GetType() == descriptorpb.FieldDescriptorProto_TYPE_MESSAGE {
ref := field.GetMessageType()
if ref.GetFile().GetFullyQualifiedName() == b.GetFile().GetName() {
if field.IsMap() {
//map keys and values are treated recursively
mk, err := process(field.GetMapKeyType(), enums)
if err != nil {
return nil, err
}
mv, err := process(field.GetMapValueType(), enums)
if err != nil {
return nil, err
}
return builder.NewMapField(field.GetName(), mk.GetType(), mv.GetType()), nil
}
mb, err := traverse(ref)
if err != nil {
return nil, err
}
//adopt locally referenced message from the same file
f := builder.NewField(field.GetName(), builder.FieldTypeMessage(mb))
clone(field, f)
return f, nil
}
}
//otherwise just clone the original field
if field.GetType() == descriptorpb.FieldDescriptorProto_TYPE_ENUM {
en := field.GetEnumType()
var eb *builder.EnumBuilder
var err error
//if the enum's parent is same as the field's parent then it's a nested enum
if en.GetParent().GetFullyQualifiedName() == field.GetParent().GetFullyQualifiedName() {
// look for the equivalent adopted nested enum and use it
for _, enum := range enums {
if enum.GetName() == en.GetName() {
eb = enum
break
}
}
}
if eb == nil {
//use imported enum if it's not nested
eb, err = builder.FromEnum(en)
if err != nil {
return nil, err
}
}
f := builder.NewField(field.GetName(), builder.FieldTypeEnum(eb))
clone(field, f)
return f, nil
}
return builder.FromField(field)
}
_, err := traverse(d)
if err != nil {
return err
}
for _, local := range messages {
b.AddMessage(local)
}
return nil
}
func (c *Client) deserializeProtobuf(ctx context.Context, schema *ProtobufSchema, data []byte) (proto.Message, error) {
//serialized data gave file descriptors containing exactly one message
m := schema.descriptor.Messages()
if m.Len() == 0 {
return nil, fmt.Errorf("serialized types are expected to have at least one message descriptor")
}
md := m.Get(0)
var result proto.Message
//try specific proto message type first
fn := md.FullName()
p, err := protoregistry.GlobalTypes.FindMessageByName(fn)
if err != nil {
return nil, fmt.Errorf("failed to locate global message type %v: %v", fn, err)
}
if p != nil {
result = proto.MessageV1(p.New())
} else {
//otherwise resolve with dynamicpb
result = dynamicpb.NewMessage(md)
}
err = c.deserializeProtobufInto(ctx, data[5:], result)
return result, err
}
func (c *Client) deserializeProtobufInto(_ context.Context, payload []byte, result proto.Message) error {
return proto.Unmarshal(payload, result)
}
func (c *Client) parseProtobufSchema(ctx context.Context, definition string, refs references, name *string) (*ProtobufSchema, error) {
var uniqueName string
if name == nil {
hash := sha256.Sum256([]byte(definition))
uniqueName = base64.StdEncoding.EncodeToString(hash[:])
} else {
uniqueName = *name
}
parser := &protoparse.Parser{
Accessor: func(filename string) (io.ReadCloser, error) {
if filename == uniqueName {
return ioutil.NopCloser(strings.NewReader(definition)), nil
} else {
return nil, protoregistry.NotFound
}
},
}
fds, err := parser.ParseFilesButDoNotLink(uniqueName)
fd := fds[0]
if err != nil {
return nil, err
}
file, err := protodesc.NewFile(fd, c.resolverWithReferences(ctx, refs))
if err != nil {
return nil, fmt.Errorf("could not resolve proto message by parsing: %v", err)
}
return NewProtobufSchema(file)
}
func (c *Client) registerReferencedProtoSchemas(ctx context.Context, file protoreflect.FileDescriptor) (references, error) {
var register func(in protoreflect.FileDescriptor) (*desc.FileDescriptor, references, error)
register = func(in protoreflect.FileDescriptor) (*desc.FileDescriptor, references, error) {
fdpb := protodesc.ToFileDescriptorProto(in)
imports := in.Imports()
refs := make(references, 0)
var deps []*desc.FileDescriptor
for i := 0; i < imports.Len(); i++ {
imp := imports.Get(i)
dp, drefs, err := register(imp)
if err != nil {
return nil, nil, err
}
for _, r := range drefs {
refs = append(refs, r)
}
deps = append(deps, dp)
}
fd, err := desc.CreateFileDescriptor(fdpb, deps...)
if err != nil {
return nil, nil, err
}
printer := new(protoprint.Printer)
buf := new(bytes.Buffer)
err = printer.PrintProtoFile(fd, buf)
if err != nil {
return nil, nil, err
}
id, err := c.registerSchemaUnderSubject(ctx, in.Path(), schemaTypeProtobuf, buf.String(), refs)
if err != nil {
return nil, nil, err
}
version, err := c.GetSubjectVersionBySchemaId(ctx, in.Path(), id)
if err != nil {
return nil, nil, err
}
refs = append(refs, reference{
Name: in.Path(),
Subject: in.Path(),
Version: version,
})
return fd, refs, nil
}
refs := make(references, 0)
imports := file.Imports()
for i := 0; i < imports.Len(); i ++ {
_, irefs, err := register(imports.Get(i))
if err != nil {
return nil, err
}
for _, r := range irefs {
refs = append(refs, r)
}
}
return refs, nil
}
func (c *Client) resolverWithReferences(ctx context.Context, refs references) protodesc.Resolver {
return &versionedResolver{ctx: ctx, registry: c, refs: refs}
}