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/**
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* Copyright 2018 Confluent Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package kafka
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import (
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"fmt"
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"strconv"
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)
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/*
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#include <string.h>
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#include "select_rdkafka.h"
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#include "glue_rdkafka.h"
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*/
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import "C"
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// Header represents a single Kafka message header.
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//
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// Message headers are made up of a list of Header elements, retaining their original insert
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// order and allowing for duplicate Keys.
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//
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// Key is a human readable string identifying the header.
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// Value is the key's binary value, Kafka does not put any restrictions on the format of
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// of the Value but it should be made relatively compact.
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// The value may be a byte array, empty, or nil.
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//
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// NOTE: Message headers are not available on producer delivery report messages.
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type Header struct {
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Key string // Header name (utf-8 string)
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Value []byte // Header value (nil, empty, or binary)
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}
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// String returns the Header Key and data in a human representable possibly truncated form
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// suitable for displaying to the user.
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func (h Header) String() string {
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if h.Value == nil {
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return fmt.Sprintf("%s=nil", h.Key)
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}
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valueLen := len(h.Value)
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if valueLen == 0 {
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return fmt.Sprintf("%s=<empty>", h.Key)
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}
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truncSize := valueLen
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trunc := ""
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if valueLen > 50+15 {
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truncSize = 50
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trunc = fmt.Sprintf("(%d more bytes)", valueLen-truncSize)
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}
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return fmt.Sprintf("%s=%s%s", h.Key, strconv.Quote(string(h.Value[:truncSize])), trunc)
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}
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