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sizefilter.go
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/
sizefilter.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package msgprocessor
import (
"fmt"
cb "github.com/hyperledger/fabric/protos/common"
ab "github.com/hyperledger/fabric/protos/orderer"
)
// Support defines the subset of the channel support required to create this filter
type Support interface {
BatchSize() *ab.BatchSize
}
// New creates a size filter which rejects messages larger than maxBytes
func NewSizeFilter(support Support) *MaxBytesRule {
return &MaxBytesRule{support: support}
}
// MaxBytesRule implements the Rule interface.
type MaxBytesRule struct {
support Support
}
// Apply returns an error if the message exceeds the configured absolute max batch size.
func (r *MaxBytesRule) Apply(message *cb.Envelope) error {
maxBytes := r.support.BatchSize().AbsoluteMaxBytes
if size := messageByteSize(message); size > maxBytes {
return fmt.Errorf("message payload is %d bytes and exceeds maximum allowed %d bytes", size, maxBytes)
}
return nil
}
func messageByteSize(message *cb.Envelope) uint32 {
// XXX this is good approximation, but is going to be a few bytes short, because of the field specifiers in the proto marshaling
// this should probably be padded to determine the true exact marshaled size
return uint32(len(message.Payload) + len(message.Signature))
}