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67 lines
1.9 KiB
67 lines
1.9 KiB
/** |
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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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