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types.go
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types.go
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package descriptor
import (
"fmt"
"strings"
"github.com/grpc-ecosystem/grpc-gateway/v2/internal/casing"
"github.com/grpc-ecosystem/grpc-gateway/v2/internal/httprule"
"google.golang.org/protobuf/types/descriptorpb"
"google.golang.org/protobuf/types/pluginpb"
)
// IsWellKnownType returns true if the provided fully qualified type name is considered 'well-known'.
func IsWellKnownType(typeName string) bool {
_, ok := wellKnownTypeConv[typeName]
return ok
}
// GoPackage represents a golang package.
type GoPackage struct {
// Path is the package path to the package.
Path string
// Name is the package name of the package
Name string
// Alias is an alias of the package unique within the current invocation of gRPC-Gateway generator.
Alias string
}
// Standard returns whether the import is a golang standard package.
func (p GoPackage) Standard() bool {
return !strings.Contains(p.Path, ".")
}
// String returns a string representation of this package in the form of import line in golang.
func (p GoPackage) String() string {
if p.Alias == "" {
return fmt.Sprintf("%q", p.Path)
}
return fmt.Sprintf("%s %q", p.Alias, p.Path)
}
// ResponseFile wraps pluginpb.CodeGeneratorResponse_File.
type ResponseFile struct {
*pluginpb.CodeGeneratorResponse_File
// GoPkg is the Go package of the generated file.
GoPkg GoPackage
}
// File wraps descriptorpb.FileDescriptorProto for richer features.
type File struct {
*descriptorpb.FileDescriptorProto
// GoPkg is the go package of the go file generated from this file.
GoPkg GoPackage
// GeneratedFilenamePrefix is used to construct filenames for generated
// files associated with this source file.
//
// For example, the source file "dir/foo.proto" might have a filename prefix
// of "dir/foo". Appending ".pb.go" produces an output file of "dir/foo.pb.go".
GeneratedFilenamePrefix string
// Messages is the list of messages defined in this file.
Messages []*Message
// Enums is the list of enums defined in this file.
Enums []*Enum
// Services is the list of services defined in this file.
Services []*Service
}
// Pkg returns package name or alias if it's present
func (f *File) Pkg() string {
pkg := f.GoPkg.Name
if alias := f.GoPkg.Alias; alias != "" {
pkg = alias
}
return pkg
}
// proto2 determines if the syntax of the file is proto2.
func (f *File) proto2() bool {
return f.Syntax == nil || f.GetSyntax() == "proto2"
}
// Message describes a protocol buffer message types.
type Message struct {
*descriptorpb.DescriptorProto
// File is the file where the message is defined.
File *File
// Outers is a list of outer messages if this message is a nested type.
Outers []string
// Fields is a list of message fields.
Fields []*Field
// Index is proto path index of this message in File.
Index int
// ForcePrefixedName when set to true, prefixes a type with a package prefix.
ForcePrefixedName bool
}
// FQMN returns a fully qualified message name of this message.
func (m *Message) FQMN() string {
components := []string{""}
if m.File.Package != nil {
components = append(components, m.File.GetPackage())
}
components = append(components, m.Outers...)
components = append(components, m.GetName())
return strings.Join(components, ".")
}
// GoType returns a go type name for the message type.
// It prefixes the type name with the package alias if
// its belonging package is not "currentPackage".
func (m *Message) GoType(currentPackage string) string {
var components []string
components = append(components, m.Outers...)
components = append(components, m.GetName())
name := strings.Join(components, "_")
if !m.ForcePrefixedName && m.File.GoPkg.Path == currentPackage {
return name
}
return fmt.Sprintf("%s.%s", m.File.Pkg(), name)
}
// Enum describes a protocol buffer enum types.
type Enum struct {
*descriptorpb.EnumDescriptorProto
// File is the file where the enum is defined
File *File
// Outers is a list of outer messages if this enum is a nested type.
Outers []string
// Index is a enum index value.
Index int
// ForcePrefixedName when set to true, prefixes a type with a package prefix.
ForcePrefixedName bool
}
// FQEN returns a fully qualified enum name of this enum.
func (e *Enum) FQEN() string {
components := []string{""}
if e.File.Package != nil {
components = append(components, e.File.GetPackage())
}
components = append(components, e.Outers...)
components = append(components, e.GetName())
return strings.Join(components, ".")
}
// GoType returns a go type name for the enum type.
// It prefixes the type name with the package alias if
// its belonging package is not "currentPackage".
func (e *Enum) GoType(currentPackage string) string {
var components []string
components = append(components, e.Outers...)
components = append(components, e.GetName())
name := strings.Join(components, "_")
if !e.ForcePrefixedName && e.File.GoPkg.Path == currentPackage {
return name
}
return fmt.Sprintf("%s.%s", e.File.Pkg(), name)
}
// Service wraps descriptorpb.ServiceDescriptorProto for richer features.
type Service struct {
*descriptorpb.ServiceDescriptorProto
// File is the file where this service is defined.
File *File
// Methods is the list of methods defined in this service.
Methods []*Method
// ForcePrefixedName when set to true, prefixes a type with a package prefix.
ForcePrefixedName bool
}
// FQSN returns the fully qualified service name of this service.
func (s *Service) FQSN() string {
components := []string{""}
if s.File.Package != nil {
components = append(components, s.File.GetPackage())
}
components = append(components, s.GetName())
return strings.Join(components, ".")
}
// InstanceName returns object name of the service with package prefix if needed
func (s *Service) InstanceName() string {
if !s.ForcePrefixedName {
return s.GetName()
}
return fmt.Sprintf("%s.%s", s.File.Pkg(), s.GetName())
}
// ClientConstructorName returns name of the Client constructor with package prefix if needed
func (s *Service) ClientConstructorName() string {
constructor := "New" + s.GetName() + "Client"
if !s.ForcePrefixedName {
return constructor
}
return fmt.Sprintf("%s.%s", s.File.Pkg(), constructor)
}
// Method wraps descriptorpb.MethodDescriptorProto for richer features.
type Method struct {
*descriptorpb.MethodDescriptorProto
// Service is the service which this method belongs to.
Service *Service
// RequestType is the message type of requests to this method.
RequestType *Message
// ResponseType is the message type of responses from this method.
ResponseType *Message
Bindings []*Binding
}
// FQMN returns a fully qualified rpc method name of this method.
func (m *Method) FQMN() string {
var components []string
components = append(components, m.Service.FQSN())
components = append(components, m.GetName())
return strings.Join(components, ".")
}
// Binding describes how an HTTP endpoint is bound to a gRPC method.
type Binding struct {
// Method is the method which the endpoint is bound to.
Method *Method
// Index is a zero-origin index of the binding in the target method
Index int
// PathTmpl is path template where this method is mapped to.
PathTmpl httprule.Template
// HTTPMethod is the HTTP method which this method is mapped to.
HTTPMethod string
// PathParams is the list of parameters provided in HTTP request paths.
PathParams []Parameter
// Body describes parameters provided in HTTP request body.
Body *Body
// ResponseBody describes field in response struct to marshal in HTTP response body.
ResponseBody *Body
}
// ExplicitParams returns a list of explicitly bound parameters of "b",
// i.e. a union of field path for body and field paths for path parameters.
func (b *Binding) ExplicitParams() []string {
var result []string
if b.Body != nil {
result = append(result, b.Body.FieldPath.String())
}
for _, p := range b.PathParams {
result = append(result, p.FieldPath.String())
}
return result
}
// Field wraps descriptorpb.FieldDescriptorProto for richer features.
type Field struct {
*descriptorpb.FieldDescriptorProto
// Message is the message type which this field belongs to.
Message *Message
// FieldMessage is the message type of the field.
FieldMessage *Message
// ForcePrefixedName when set to true, prefixes a type with a package prefix.
ForcePrefixedName bool
}
// FQFN returns a fully qualified field name of this field.
func (f *Field) FQFN() string {
return strings.Join([]string{f.Message.FQMN(), f.GetName()}, ".")
}
// Parameter is a parameter provided in http requests
type Parameter struct {
// FieldPath is a path to a proto field which this parameter is mapped to.
FieldPath
// Target is the proto field which this parameter is mapped to.
Target *Field
// Method is the method which this parameter is used for.
Method *Method
}
// ConvertFuncExpr returns a go expression of a converter function.
// The converter function converts a string into a value for the parameter.
func (p Parameter) ConvertFuncExpr() (string, error) {
tbl := proto3ConvertFuncs
if !p.IsProto2() && p.IsRepeated() {
tbl = proto3RepeatedConvertFuncs
} else if !p.IsProto2() && p.IsOptionalProto3() {
tbl = proto3OptionalConvertFuncs
} else if p.IsProto2() && !p.IsRepeated() {
tbl = proto2ConvertFuncs
} else if p.IsProto2() && p.IsRepeated() {
tbl = proto2RepeatedConvertFuncs
}
typ := p.Target.GetType()
conv, ok := tbl[typ]
if !ok {
conv, ok = wellKnownTypeConv[p.Target.GetTypeName()]
}
if !ok {
return "", fmt.Errorf("unsupported field type %s of parameter %s in %s.%s", typ, p.FieldPath, p.Method.Service.GetName(), p.Method.GetName())
}
return conv, nil
}
// IsEnum returns true if the field is an enum type, otherwise false is returned.
func (p Parameter) IsEnum() bool {
return p.Target.GetType() == descriptorpb.FieldDescriptorProto_TYPE_ENUM
}
// IsRepeated returns true if the field is repeated, otherwise false is returned.
func (p Parameter) IsRepeated() bool {
return p.Target.GetLabel() == descriptorpb.FieldDescriptorProto_LABEL_REPEATED
}
// IsProto2 returns true if the field is proto2, otherwise false is returned.
func (p Parameter) IsProto2() bool {
return p.Target.Message.File.proto2()
}
// Body describes a http (request|response) body to be sent to the (method|client).
// This is used in body and response_body options in google.api.HttpRule
type Body struct {
// FieldPath is a path to a proto field which the (request|response) body is mapped to.
// The (request|response) body is mapped to the (request|response) type itself if FieldPath is empty.
FieldPath FieldPath
}
// AssignableExpr returns an assignable expression in Go to be used to initialize method request object.
// It starts with "msgExpr", which is the go expression of the method request object.
func (b Body) AssignableExpr(msgExpr string, currentPackage string) string {
return b.FieldPath.AssignableExpr(msgExpr, currentPackage)
}
// AssignableExprPrep returns preparatory statements for an assignable expression to initialize the
// method request object.
func (b Body) AssignableExprPrep(msgExpr string, currentPackage string) string {
return b.FieldPath.AssignableExprPrep(msgExpr, currentPackage)
}
// FieldPath is a path to a field from a request message.
type FieldPath []FieldPathComponent
// String returns a string representation of the field path.
func (p FieldPath) String() string {
components := make([]string, 0, len(p))
for _, c := range p {
components = append(components, c.Name)
}
return strings.Join(components, ".")
}
// IsNestedProto3 indicates whether the FieldPath is a nested Proto3 path.
func (p FieldPath) IsNestedProto3() bool {
if len(p) > 1 && !p[0].Target.Message.File.proto2() {
return true
}
return false
}
// IsOptionalProto3 indicates whether the FieldPath is a proto3 optional field.
func (p FieldPath) IsOptionalProto3() bool {
if len(p) == 0 {
return false
}
return p[0].Target.GetProto3Optional()
}
// AssignableExpr is an assignable expression in Go to be used to assign a value to the target field.
// It starts with "msgExpr", which is the go expression of the method request object. Before using
// such an expression the prep statements must be emitted first, in case the field path includes
// a oneof. See FieldPath.AssignableExprPrep.
func (p FieldPath) AssignableExpr(msgExpr string, currentPackage string) string {
l := len(p)
if l == 0 {
return msgExpr
}
components := msgExpr
for i, c := range p {
// We need to check if the target is not proto3_optional first.
// Under the hood, proto3_optional uses oneof to signal to old proto3 clients
// that presence is tracked for this field. This oneof is known as a "synthetic" oneof.
if !c.Target.GetProto3Optional() && c.Target.OneofIndex != nil {
index := c.Target.OneofIndex
msg := c.Target.Message
oneOfName := casing.Camel(msg.GetOneofDecl()[*index].GetName())
oneofFieldName := msg.GoType(currentPackage) + "_" + c.AssignableExpr()
if c.Target.ForcePrefixedName {
oneofFieldName = msg.File.Pkg() + "." + msg.GetName() + "_" + c.AssignableExpr()
}
components = components + "." + oneOfName + ".(*" + oneofFieldName + ")"
}
if i == l-1 {
components = components + "." + c.AssignableExpr()
continue
}
components = components + "." + c.ValueExpr()
}
return components
}
// AssignableExprPrep returns preparation statements for an assignable expression to assign a value
// to the target field. The Go expression of the method request object is "msgExpr". This is only
// needed for field paths that contain oneofs. Otherwise, an empty string is returned.
func (p FieldPath) AssignableExprPrep(msgExpr string, currentPackage string) string {
l := len(p)
if l == 0 {
return ""
}
var preparations []string
components := msgExpr
for i, c := range p {
// We need to check if the target is not proto3_optional first.
// Under the hood, proto3_optional uses oneof to signal to old proto3 clients
// that presence is tracked for this field. This oneof is known as a "synthetic" oneof.
if !c.Target.GetProto3Optional() && c.Target.OneofIndex != nil {
index := c.Target.OneofIndex
msg := c.Target.Message
oneOfName := casing.Camel(msg.GetOneofDecl()[*index].GetName())
oneofFieldName := msg.GoType(currentPackage) + "_" + c.AssignableExpr()
if c.Target.ForcePrefixedName {
oneofFieldName = msg.File.Pkg() + "." + msg.GetName() + "_" + c.AssignableExpr()
}
components = components + "." + oneOfName
s := `if %s == nil {
%s =&%s{}
} else if _, ok := %s.(*%s); !ok {
return nil, metadata, status.Errorf(codes.InvalidArgument, "expect type: *%s, but: %%t\n",%s)
}`
preparations = append(preparations, fmt.Sprintf(s, components, components, oneofFieldName, components, oneofFieldName, oneofFieldName, components))
components = components + ".(*" + oneofFieldName + ")"
}
if i == l-1 {
components = components + "." + c.AssignableExpr()
continue
}
components = components + "." + c.ValueExpr()
}
return strings.Join(preparations, "\n")
}
// FieldPathComponent is a path component in FieldPath
type FieldPathComponent struct {
// Name is a name of the proto field which this component corresponds to.
// TODO(yugui) is this necessary?
Name string
// Target is the proto field which this component corresponds to.
Target *Field
}
// AssignableExpr returns an assignable expression in go for this field.
func (c FieldPathComponent) AssignableExpr() string {
return casing.Camel(c.Name)
}
// ValueExpr returns an expression in go for this field.
func (c FieldPathComponent) ValueExpr() string {
if c.Target.Message.File.proto2() {
return fmt.Sprintf("Get%s()", casing.Camel(c.Name))
}
return casing.Camel(c.Name)
}
var (
proto3ConvertFuncs = map[descriptorpb.FieldDescriptorProto_Type]string{
descriptorpb.FieldDescriptorProto_TYPE_DOUBLE: "runtime.Float64",
descriptorpb.FieldDescriptorProto_TYPE_FLOAT: "runtime.Float32",
descriptorpb.FieldDescriptorProto_TYPE_INT64: "runtime.Int64",
descriptorpb.FieldDescriptorProto_TYPE_UINT64: "runtime.Uint64",
descriptorpb.FieldDescriptorProto_TYPE_INT32: "runtime.Int32",
descriptorpb.FieldDescriptorProto_TYPE_FIXED64: "runtime.Uint64",
descriptorpb.FieldDescriptorProto_TYPE_FIXED32: "runtime.Uint32",
descriptorpb.FieldDescriptorProto_TYPE_BOOL: "runtime.Bool",
descriptorpb.FieldDescriptorProto_TYPE_STRING: "runtime.String",
// FieldDescriptorProto_TYPE_GROUP
// FieldDescriptorProto_TYPE_MESSAGE
descriptorpb.FieldDescriptorProto_TYPE_BYTES: "runtime.Bytes",
descriptorpb.FieldDescriptorProto_TYPE_UINT32: "runtime.Uint32",
descriptorpb.FieldDescriptorProto_TYPE_ENUM: "runtime.Enum",
descriptorpb.FieldDescriptorProto_TYPE_SFIXED32: "runtime.Int32",
descriptorpb.FieldDescriptorProto_TYPE_SFIXED64: "runtime.Int64",
descriptorpb.FieldDescriptorProto_TYPE_SINT32: "runtime.Int32",
descriptorpb.FieldDescriptorProto_TYPE_SINT64: "runtime.Int64",
}
proto3OptionalConvertFuncs = func() map[descriptorpb.FieldDescriptorProto_Type]string {
result := make(map[descriptorpb.FieldDescriptorProto_Type]string)
for typ, converter := range proto3ConvertFuncs {
// TODO: this will use convert functions from proto2.
// The converters returning pointers should be moved
// to a more generic file.
result[typ] = converter + "P"
}
return result
}()
// TODO: replace it with a IIFE
proto3RepeatedConvertFuncs = map[descriptorpb.FieldDescriptorProto_Type]string{
descriptorpb.FieldDescriptorProto_TYPE_DOUBLE: "runtime.Float64Slice",
descriptorpb.FieldDescriptorProto_TYPE_FLOAT: "runtime.Float32Slice",
descriptorpb.FieldDescriptorProto_TYPE_INT64: "runtime.Int64Slice",
descriptorpb.FieldDescriptorProto_TYPE_UINT64: "runtime.Uint64Slice",
descriptorpb.FieldDescriptorProto_TYPE_INT32: "runtime.Int32Slice",
descriptorpb.FieldDescriptorProto_TYPE_FIXED64: "runtime.Uint64Slice",
descriptorpb.FieldDescriptorProto_TYPE_FIXED32: "runtime.Uint32Slice",
descriptorpb.FieldDescriptorProto_TYPE_BOOL: "runtime.BoolSlice",
descriptorpb.FieldDescriptorProto_TYPE_STRING: "runtime.StringSlice",
// FieldDescriptorProto_TYPE_GROUP
// FieldDescriptorProto_TYPE_MESSAGE
descriptorpb.FieldDescriptorProto_TYPE_BYTES: "runtime.BytesSlice",
descriptorpb.FieldDescriptorProto_TYPE_UINT32: "runtime.Uint32Slice",
descriptorpb.FieldDescriptorProto_TYPE_ENUM: "runtime.EnumSlice",
descriptorpb.FieldDescriptorProto_TYPE_SFIXED32: "runtime.Int32Slice",
descriptorpb.FieldDescriptorProto_TYPE_SFIXED64: "runtime.Int64Slice",
descriptorpb.FieldDescriptorProto_TYPE_SINT32: "runtime.Int32Slice",
descriptorpb.FieldDescriptorProto_TYPE_SINT64: "runtime.Int64Slice",
}
proto2ConvertFuncs = map[descriptorpb.FieldDescriptorProto_Type]string{
descriptorpb.FieldDescriptorProto_TYPE_DOUBLE: "runtime.Float64P",
descriptorpb.FieldDescriptorProto_TYPE_FLOAT: "runtime.Float32P",
descriptorpb.FieldDescriptorProto_TYPE_INT64: "runtime.Int64P",
descriptorpb.FieldDescriptorProto_TYPE_UINT64: "runtime.Uint64P",
descriptorpb.FieldDescriptorProto_TYPE_INT32: "runtime.Int32P",
descriptorpb.FieldDescriptorProto_TYPE_FIXED64: "runtime.Uint64P",
descriptorpb.FieldDescriptorProto_TYPE_FIXED32: "runtime.Uint32P",
descriptorpb.FieldDescriptorProto_TYPE_BOOL: "runtime.BoolP",
descriptorpb.FieldDescriptorProto_TYPE_STRING: "runtime.StringP",
// FieldDescriptorProto_TYPE_GROUP
// FieldDescriptorProto_TYPE_MESSAGE
// FieldDescriptorProto_TYPE_BYTES
// TODO(yugui) Handle bytes
descriptorpb.FieldDescriptorProto_TYPE_UINT32: "runtime.Uint32P",
descriptorpb.FieldDescriptorProto_TYPE_ENUM: "runtime.EnumP",
descriptorpb.FieldDescriptorProto_TYPE_SFIXED32: "runtime.Int32P",
descriptorpb.FieldDescriptorProto_TYPE_SFIXED64: "runtime.Int64P",
descriptorpb.FieldDescriptorProto_TYPE_SINT32: "runtime.Int32P",
descriptorpb.FieldDescriptorProto_TYPE_SINT64: "runtime.Int64P",
}
proto2RepeatedConvertFuncs = map[descriptorpb.FieldDescriptorProto_Type]string{
descriptorpb.FieldDescriptorProto_TYPE_DOUBLE: "runtime.Float64Slice",
descriptorpb.FieldDescriptorProto_TYPE_FLOAT: "runtime.Float32Slice",
descriptorpb.FieldDescriptorProto_TYPE_INT64: "runtime.Int64Slice",
descriptorpb.FieldDescriptorProto_TYPE_UINT64: "runtime.Uint64Slice",
descriptorpb.FieldDescriptorProto_TYPE_INT32: "runtime.Int32Slice",
descriptorpb.FieldDescriptorProto_TYPE_FIXED64: "runtime.Uint64Slice",
descriptorpb.FieldDescriptorProto_TYPE_FIXED32: "runtime.Uint32Slice",
descriptorpb.FieldDescriptorProto_TYPE_BOOL: "runtime.BoolSlice",
descriptorpb.FieldDescriptorProto_TYPE_STRING: "runtime.StringSlice",
// FieldDescriptorProto_TYPE_GROUP
// FieldDescriptorProto_TYPE_MESSAGE
// FieldDescriptorProto_TYPE_BYTES
// TODO(maros7) Handle bytes
descriptorpb.FieldDescriptorProto_TYPE_UINT32: "runtime.Uint32Slice",
descriptorpb.FieldDescriptorProto_TYPE_ENUM: "runtime.EnumSlice",
descriptorpb.FieldDescriptorProto_TYPE_SFIXED32: "runtime.Int32Slice",
descriptorpb.FieldDescriptorProto_TYPE_SFIXED64: "runtime.Int64Slice",
descriptorpb.FieldDescriptorProto_TYPE_SINT32: "runtime.Int32Slice",
descriptorpb.FieldDescriptorProto_TYPE_SINT64: "runtime.Int64Slice",
}
wellKnownTypeConv = map[string]string{
".google.protobuf.Timestamp": "runtime.Timestamp",
".google.protobuf.Duration": "runtime.Duration",
".google.protobuf.StringValue": "runtime.StringValue",
".google.protobuf.FloatValue": "runtime.FloatValue",
".google.protobuf.DoubleValue": "runtime.DoubleValue",
".google.protobuf.BoolValue": "runtime.BoolValue",
".google.protobuf.BytesValue": "runtime.BytesValue",
".google.protobuf.Int32Value": "runtime.Int32Value",
".google.protobuf.UInt32Value": "runtime.UInt32Value",
".google.protobuf.Int64Value": "runtime.Int64Value",
".google.protobuf.UInt64Value": "runtime.UInt64Value",
}
)