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package kafka
/**
* Copyright 2018 Confluent Inc.
*
* 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.
*/
import (
"fmt"
"strconv"
)
/*
#include <string.h>
#include <librdkafka/rdkafka.h>
#include "glue_rdkafka.h"
*/
import "C"
// Header represents a single Kafka message header.
//
// Message headers are made up of a list of Header elements, retaining their original insert
// order and allowing for duplicate Keys.
//
// Key is a human readable string identifying the header.
// Value is the key's binary value, Kafka does not put any restrictions on the format of
// of the Value but it should be made relatively compact.
// The value may be a byte array, empty, or nil.
//
// NOTE: Message headers are not available on producer delivery report messages.
type Header struct {
Key string // Header name (utf-8 string)
Value []byte // Header value (nil, empty, or binary)
}
// String returns the Header Key and data in a human representable possibly truncated form
// suitable for displaying to the user.
func (h Header) String() string {
if h.Value == nil {
return fmt.Sprintf("%s=nil", h.Key)
}
valueLen := len(h.Value)
if valueLen == 0 {
return fmt.Sprintf("%s=<empty>", h.Key)
}
truncSize := valueLen
trunc := ""
if valueLen > 50+15 {
truncSize = 50
trunc = fmt.Sprintf("(%d more bytes)", valueLen-truncSize)
}
return fmt.Sprintf("%s=%s%s", h.Key, strconv.Quote(string(h.Value[:truncSize])), trunc)
}
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