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159 lines
3.5 KiB
159 lines
3.5 KiB
package status
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import (
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"context"
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"net/http"
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"github.com/go-kratos/kratos/v2/errors"
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"github.com/go-kratos/kratos/v2/middleware"
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//lint:ignore SA1019 grpc
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"github.com/golang/protobuf/proto"
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"google.golang.org/genproto/googleapis/rpc/errdetails"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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type domainKey struct{}
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// HandlerFunc is middleware error handler.
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type HandlerFunc func(context.Context, error) error
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// Option is recovery option.
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type Option func(*options)
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type options struct {
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domain string
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handler HandlerFunc
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}
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// WithDomain with service domain.
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func WithDomain(domain string) Option {
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return func(o *options) {
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o.domain = domain
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}
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}
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// WithHandler with status handler.
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func WithHandler(h HandlerFunc) Option {
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return func(o *options) {
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o.handler = h
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}
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}
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// Server is an error middleware.
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func Server(opts ...Option) middleware.Middleware {
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options := options{
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handler: encodeErr,
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}
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for _, o := range opts {
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o(&options)
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}
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return func(handler middleware.Handler) middleware.Handler {
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return func(ctx context.Context, req interface{}) (interface{}, error) {
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reply, err := handler(ctx, req)
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if err != nil {
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ctx = context.WithValue(ctx, domainKey{}, options.domain)
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return nil, options.handler(ctx, err)
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}
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return reply, nil
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}
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}
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}
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// Client is an error middleware.
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func Client(opts ...Option) middleware.Middleware {
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options := options{
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handler: decodeErr,
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}
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for _, o := range opts {
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o(&options)
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}
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return func(handler middleware.Handler) middleware.Handler {
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return func(ctx context.Context, req interface{}) (interface{}, error) {
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reply, err := handler(ctx, req)
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if err != nil {
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return nil, options.handler(ctx, err)
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}
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return reply, nil
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}
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}
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}
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func encodeErr(ctx context.Context, err error) error {
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se := errors.FromError(err)
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if se.Domain == "" {
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se.Domain, _ = ctx.Value(domainKey{}).(string)
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}
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gs := status.Newf(httpToGRPCCode(se.Code), "%s: %s", se.Reason, se.Message)
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details := []proto.Message{
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&errdetails.ErrorInfo{
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Domain: se.Domain,
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Reason: se.Reason,
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Metadata: se.Metadata,
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},
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}
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gs, err = gs.WithDetails(details...)
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if err != nil {
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return err
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}
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return gs.Err()
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}
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func decodeErr(ctx context.Context, err error) error {
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gs := status.Convert(err)
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se := &errors.Error{
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Code: grpcToHTTPCode(gs.Code()),
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Message: gs.Message(),
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}
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for _, detail := range gs.Details() {
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switch d := detail.(type) {
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case *errdetails.ErrorInfo:
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se.Domain = d.Domain
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se.Reason = d.Reason
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se.Metadata = d.Metadata
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return se
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}
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}
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return se
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}
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func httpToGRPCCode(code int) codes.Code {
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switch code {
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case http.StatusBadRequest:
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return codes.InvalidArgument
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case http.StatusUnauthorized:
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return codes.Unauthenticated
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case http.StatusForbidden:
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return codes.PermissionDenied
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case http.StatusNotFound:
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return codes.NotFound
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case http.StatusConflict:
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return codes.Aborted
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case http.StatusInternalServerError:
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return codes.Internal
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case http.StatusServiceUnavailable:
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return codes.Unavailable
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}
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return codes.Unknown
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}
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func grpcToHTTPCode(code codes.Code) int {
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switch code {
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case codes.InvalidArgument:
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return http.StatusBadRequest
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case codes.Unauthenticated:
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return http.StatusUnauthorized
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case codes.PermissionDenied:
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return http.StatusForbidden
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case codes.NotFound:
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return http.StatusNotFound
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case codes.Aborted:
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return http.StatusConflict
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case codes.Internal:
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return http.StatusInternalServerError
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case codes.Unavailable:
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return http.StatusServiceUnavailable
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}
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return http.StatusInternalServerError
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}
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