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/
encode.go
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/
encode.go
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// Copyright 2019 eBay Inc.
// Primary authors: Simon Fell, Diego Ongaro,
// Raymond Kroeker, and Sathish Kandasamy.
//
// 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
// https://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.
package logencoder
import (
"github.com/ebay/akutan/logentry"
"github.com/sirupsen/logrus"
)
// ProtobufCommand defines a base interface that all protobuf generated types
// implement
type ProtobufCommand interface {
ProtoMessage()
Size() int
MarshalTo([]byte) (int, error)
Unmarshal([]byte) error
}
// Encode will take the supplied command and serialize into a format
// suitable for persisting to the log. cmd should be one of the
// *Command types from the logentry package. If its unable to serialize
// the Command, that implies a programmer error somewhere, and it will
// panic.
func Encode(cmd ProtobufCommand) []byte {
res := make([]byte, cmd.Size()+1)
if _, err := cmd.MarshalTo(res[1:]); err != nil {
logrus.Panicf("Unable to MarshalTo logentry Command %T: %v", cmd, err)
}
switch cmd.(type) {
case *logentry.InsertTxCommand:
res[0] = byte(insertTx)
case *logentry.TxDecisionCommand:
res[0] = byte(txDecision)
case *logentry.WipeCommand:
res[0] = byte(wipe)
case *logentry.SkippedCommand:
res[0] = byte(skipped)
case *logentry.VersionCommand:
res[0] = byte(version)
case *logentry.PingCommand:
res[0] = byte(ping)
default:
logrus.Panicf("Encode received an unexpected type %T", cmd)
}
return res
}