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blob_to_multi.go
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blob_to_multi.go
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// Copyright (c) 2017 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package processor
import (
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/service/log"
"github.com/Jeffail/benthos/lib/util/service/metrics"
)
//------------------------------------------------------------------------------
func init() {
constructors["blob_to_multi"] = typeSpec{
constructor: NewBlobToMulti,
description: `
If a multiple part message has been encoded into a single part message using the
multi to blob processor then this processor is able to convert it back into a
multiple part message.
You can therefore use this processor when multiple Benthos instances are
bridging between message queues that don't support multiple parts.
E.g. ZMQ => Benthos(multi to blob) => Kafka => Benthos(blob to multi)`,
}
}
//------------------------------------------------------------------------------
// BlobToMulti is a processor that takes messages with a single part in a
// benthos multiple part blob format and decodes them into multiple part
// messages.
type BlobToMulti struct {
log log.Modular
stats metrics.Type
}
// NewBlobToMulti returns a BlobToMulti processor.
func NewBlobToMulti(conf Config, log log.Modular, stats metrics.Type) (Type, error) {
return &BlobToMulti{
log: log.NewModule(".processor.blob_to_multi"),
stats: stats,
}, nil
}
//------------------------------------------------------------------------------
// ProcessMessage takes a message with 1 part in multiple part blob format and
// returns a multiple part message by decoding it.
func (m *BlobToMulti) ProcessMessage(msg *types.Message) (*types.Message, types.Response, bool) {
m.stats.Incr("processor.blob_to_multi.count", 1)
if len(msg.Parts) != 1 {
m.stats.Incr("processor.blob_to_multi.dropped", 1)
m.log.Errorf("Cannot decode message into mutiple parts due to parts count: %v != 1\n", len(msg.Parts))
return nil, types.NewSimpleResponse(nil), false
}
newMsg, err := types.FromBytes(msg.Parts[0])
if err != nil {
m.stats.Incr("processor.blob_to_multi.dropped", 1)
m.log.Errorf("Failed to decode message into multiple parts: %v\n", err)
return nil, types.NewSimpleResponse(nil), false
}
return &newMsg, nil, true
}
//------------------------------------------------------------------------------