/
responsemeta.go
103 lines (84 loc) · 3.79 KB
/
responsemeta.go
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package responsemeta
import (
"context"
"fmt"
"strconv"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
// ResponseMetadataHeaderKey defines a key in the response metadata header.
type ResponseMetadataHeaderKey string
const (
// RequestID is the key in the response header metadata for the request's tracking ID, if any.
RequestID ResponseMetadataHeaderKey = "io.spicedb.respmeta.requestid"
// ServerVersion is the key in the response header metadata holding the version of the server
// handling the API request, if requested via a request header.
ServerVersion ResponseMetadataHeaderKey = "io.spicedb.debug.version"
// DatastoreType is the key in the response header metadata holding the type of datastore for
// the server, if requested via a request header.
DatastoreType ResponseMetadataHeaderKey = "io.spicedb.debug.datastore"
// Configuration is the key in the response header metadata holding the configuration (arguments
// and environment variables) for the server, if requested via a request header. It will be repeated
// for each value.
Configuration ResponseMetadataHeaderKey = "io.spicedb.debug.configuration"
)
// ResponseMetadataTrailerKey defines a key in the response metadata trailer.
type ResponseMetadataTrailerKey string
const (
// DispatchedOperationsCount is the key in the response trailer metadata for
// the number of dispatched operations that were needed to perform the overall
// API call.
DispatchedOperationsCount ResponseMetadataTrailerKey = "io.spicedb.respmeta.dispatchedoperationscount"
// CachedOperationsCount is the key in the response trailer metadata for
// the number of *cached* operations that would have been otherwise dispatched
// to perform the overall API call.
CachedOperationsCount ResponseMetadataTrailerKey = "io.spicedb.respmeta.cachedoperationscount"
)
// SetResponseHeaderMetadata sets the external response metadata header on the given context.
func SetResponseHeaderMetadata(ctx context.Context, values map[ResponseMetadataHeaderKey]string) error {
pairs := make([]string, 0, len(values)*2)
for key, value := range values {
pairs = append(pairs, string(key))
pairs = append(pairs, value)
}
return grpc.SetHeader(ctx, metadata.Pairs(pairs...))
}
// SetResponseTrailerMetadata sets the external response metadata trailer on the given context.
func SetResponseTrailerMetadata(ctx context.Context, values map[ResponseMetadataTrailerKey]string) error {
pairs := make([]string, 0, len(values)*2)
for key, value := range values {
pairs = append(pairs, string(key))
pairs = append(pairs, value)
}
return grpc.SetTrailer(ctx, metadata.Pairs(pairs...))
}
// ListResponseTrailerMetadata retrieves the string value(s) for the given key in the trailer
// metadata of a SpiceDB API response.
func ListResponseTrailerMetadata(trailer metadata.MD, key ResponseMetadataTrailerKey) ([]string, error) {
values := trailer.Get(string(key))
if len(values) == 0 {
return []string{}, fmt.Errorf("key `%s` not found in trailer", key)
}
return values, nil
}
// GetResponseTrailerMetadata retrieves a string value for the given key in the trailer
// metadata of a SpiceDB API response.
func GetResponseTrailerMetadata(trailer metadata.MD, key ResponseMetadataTrailerKey) (string, error) {
values, err := ListResponseTrailerMetadata(trailer, key)
if err != nil {
return "", err
}
if len(values) != 1 {
return "", fmt.Errorf("key `%s` found multiple times in trailer", key)
}
return values[0], nil
}
// GetIntResponseTrailerMetadata retrieves an integer value for the given key in the trailer
// metadata of a SpiceDB API response.
func GetIntResponseTrailerMetadata(trailer metadata.MD, key ResponseMetadataTrailerKey) (int, error) {
found, err := GetResponseTrailerMetadata(trailer, key)
if err != nil {
return 0, err
}
return strconv.Atoi(found)
}