org.springframework.boot.actuate.autoconfigure.tracing.zipkin.HttpSender Maven / Gradle / Ivy
/*
* Copyright 2012-2024 the original author or authors.
*
* 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
*
* https://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.
*/
package org.springframework.boot.actuate.autoconfigure.tracing.zipkin;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.URI;
import java.util.List;
import java.util.zip.GZIPOutputStream;
import zipkin2.reporter.BaseHttpSender;
import zipkin2.reporter.BytesMessageSender;
import zipkin2.reporter.Encoding;
import zipkin2.reporter.HttpEndpointSupplier.Factory;
import org.springframework.http.HttpHeaders;
import org.springframework.util.unit.DataSize;
/**
* A Zipkin {@link BytesMessageSender} that uses an HTTP client to send JSON spans.
* Supports automatic compression with gzip.
*
* @author Moritz Halbritter
* @author Stefan Bratanov
*/
abstract class HttpSender extends BaseHttpSender {
/**
* Only use gzip compression on data which is bigger than this in bytes.
*/
private static final DataSize COMPRESSION_THRESHOLD = DataSize.ofKilobytes(1);
HttpSender(Encoding encoding, Factory endpointSupplierFactory, String endpoint) {
super(encoding, endpointSupplierFactory, endpoint);
}
@Override
protected URI newEndpoint(String endpoint) {
return URI.create(endpoint);
}
@Override
protected byte[] newBody(List list) {
return this.encoding.encode(list);
}
@Override
protected void postSpans(URI endpoint, byte[] body) throws IOException {
HttpHeaders headers = getDefaultHeaders();
if (needsCompression(body)) {
body = compress(body);
headers.set("Content-Encoding", "gzip");
}
postSpans(endpoint, headers, body);
}
abstract void postSpans(URI endpoint, HttpHeaders headers, byte[] body) throws IOException;
HttpHeaders getDefaultHeaders() {
HttpHeaders headers = new HttpHeaders();
headers.set("b3", "0");
headers.set("Content-Type", this.encoding.mediaType());
return headers;
}
private boolean needsCompression(byte[] body) {
return body.length > COMPRESSION_THRESHOLD.toBytes();
}
private byte[] compress(byte[] input) throws IOException {
ByteArrayOutputStream result = new ByteArrayOutputStream();
try (GZIPOutputStream gzip = new GZIPOutputStream(result)) {
gzip.write(input);
}
return result.toByteArray();
}
}