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metadata.go
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metadata.go
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/*
* Copyright (c) 2019-2022. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package grpc
import (
"context"
"strings"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
"github.com/pydio/cells/v4/common/service/context/ckeys"
metadata2 "github.com/pydio/cells/v4/common/service/context/metadata"
)
func getOrCreateOutgoingMeta(ctx context.Context) metadata.MD {
if md, ok := metadata.FromOutgoingContext(ctx); ok {
return md
} else {
return metadata.MD{}
}
}
func cellsMetaToOutgoingMeta(ctx context.Context) context.Context {
md := getOrCreateOutgoingMeta(ctx)
if lmd, ok := metadata2.FromContextRead(ctx); ok {
for k, v := range lmd {
if strings.HasPrefix(k, ":") {
continue
}
md.Set(ckeys.CellsMetaPrefix+k, v)
}
}
return metadata.NewOutgoingContext(ctx, md)
}
func MetaUnaryClientInterceptor() grpc.UnaryClientInterceptor {
return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
ctx = cellsMetaToOutgoingMeta(ctx)
return invoker(ctx, method, req, reply, cc, opts...)
}
}
func MetaStreamClientInterceptor() grpc.StreamClientInterceptor {
return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
ctx = cellsMetaToOutgoingMeta(ctx)
return streamer(ctx, desc, cc, method, opts...)
}
}