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forwarding.go
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forwarding.go
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//
// (C) Copyright 2019-2020 Intel Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE
// The Government's rights to use, modify, reproduce, release, perform, display,
// or disclose this software are subject to the terms of the Apache License as
// provided in Contract No. 8F-30005.
// Any reproduction of computer software, computer software documentation, or
// portions thereof marked with this legend must also reproduce the markings.
//
package pbin
import (
"context"
"encoding/json"
"github.com/pkg/errors"
"github.com/daos-stack/daos/src/control/common"
"github.com/daos-stack/daos/src/control/fault"
"github.com/daos-stack/daos/src/control/logging"
)
type (
// Forwarder provides a common implementation of a request forwarder.
Forwarder struct {
Disabled bool
log logging.Logger
pbinName string
}
// ForwardableRequest is intended to be embedded into
// request types that can be forwarded to the privileged
// binary.
ForwardableRequest struct {
Forwarded bool
}
// ForwardChecker defines an interface for any request that
// could have been forwarded.
ForwardChecker interface {
IsForwarded() bool
}
)
// IsForwarded implements the ForwardChecker interface.
func (r ForwardableRequest) IsForwarded() bool {
return r.Forwarded
}
// NewForwarder returns a configured *Forwarder.
func NewForwarder(log logging.Logger, pbinName string) *Forwarder {
fwd := &Forwarder{
log: log,
pbinName: pbinName,
}
return fwd
}
// SendReq is responsible for marshaling the forwarded request into a message
// that is sent to the privileged binary, then unmarshaling the response for
// the caller.
func (f *Forwarder) SendReq(method string, fwdReq interface{}, fwdRes interface{}) error {
if fwdReq == nil {
return errors.New("nil request")
}
if fwdRes == nil {
return errors.New("nil response")
}
pbinPath, err := common.FindBinary(f.pbinName)
if err != nil {
return err
}
payload, err := json.Marshal(fwdReq)
if err != nil {
return errors.Wrap(err, "failed to marshal forwarded request as payload")
}
req := &Request{
Method: method,
Payload: payload,
}
ctx := context.TODO()
res, err := ExecReq(ctx, f.log, pbinPath, req)
if err != nil {
if fault.IsFault(err) {
return err
}
return errors.Wrap(err, "privileged binary execution failed")
}
if err := json.Unmarshal(res.Payload, fwdRes); err != nil {
return errors.Wrap(err, "failed to unmarshal forwarded response")
}
return nil
}