io.servicetalk.opentracing.zipkin.publisher.reporter.HttpReporter Maven / Gradle / Ivy
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A networking framework that evolves with your application
/*
* Copyright © 2019, 2021 Apple Inc. and the ServiceTalk project 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
*
* 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.
*/
package io.servicetalk.opentracing.zipkin.publisher.reporter;
import io.servicetalk.buffer.api.Buffer;
import io.servicetalk.buffer.api.BufferAllocator;
import io.servicetalk.concurrent.CompletableSource;
import io.servicetalk.concurrent.PublisherSource;
import io.servicetalk.concurrent.api.AsyncCloseable;
import io.servicetalk.concurrent.api.BufferStrategy.Accumulator;
import io.servicetalk.concurrent.api.Completable;
import io.servicetalk.concurrent.api.CompositeCloseable;
import io.servicetalk.concurrent.api.Publisher;
import io.servicetalk.http.api.HttpClient;
import io.servicetalk.http.api.HttpResponseStatus;
import io.servicetalk.http.api.SingleAddressHttpClientBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import zipkin2.CheckResult;
import zipkin2.Component;
import zipkin2.Span;
import zipkin2.codec.SpanBytesEncoder;
import zipkin2.reporter.Reporter;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;
import javax.annotation.Nonnull;
import static io.servicetalk.buffer.api.CharSequences.newAsciiString;
import static io.servicetalk.concurrent.api.AsyncCloseables.newCompositeCloseable;
import static io.servicetalk.concurrent.api.AsyncCloseables.toAsyncCloseable;
import static io.servicetalk.concurrent.api.BufferStrategies.forCountOrTime;
import static io.servicetalk.concurrent.api.Completable.completed;
import static io.servicetalk.concurrent.api.Processors.newCompletableProcessor;
import static io.servicetalk.concurrent.api.Processors.newPublisherProcessorDropHeadOnOverflow;
import static io.servicetalk.concurrent.api.SourceAdapters.fromSource;
import static io.servicetalk.concurrent.api.SourceAdapters.toSource;
import static io.servicetalk.concurrent.internal.FutureUtils.awaitTermination;
import static io.servicetalk.http.api.HttpHeaderNames.CONTENT_TYPE;
import static io.servicetalk.http.api.HttpHeaderValues.APPLICATION_JSON;
import static io.servicetalk.http.api.HttpResponseStatus.StatusClass.SUCCESSFUL_2XX;
import static java.time.Duration.ofSeconds;
import static java.util.Objects.requireNonNull;
import static zipkin2.CheckResult.OK;
import static zipkin2.CheckResult.failed;
/**
* A {@link Span} {@link Reporter} that will publish to an HTTP endpoint with a configurable encoding {@link Codec}.
*/
public final class HttpReporter extends Component implements Reporter, AsyncCloseable {
private static final Logger LOGGER = LoggerFactory.getLogger(HttpReporter.class);
static final String V1_PATH = "/api/v1/spans";
static final String V2_PATH = "/api/v2/spans";
static final CharSequence THRIFT_CONTENT_TYPE = newAsciiString("application/x-thrift");
static final CharSequence PROTO_CONTENT_TYPE = newAsciiString("application/x-protobuf");
private final PublisherSource.Processor buffer;
private final CompositeCloseable closeable;
private volatile boolean closeInitiated;
private HttpReporter(final Builder builder) {
closeable = newCompositeCloseable();
final HttpClient client = closeable.append(builder.clientBuilder.build());
try {
buffer = initReporter(builder, client);
} catch (Throwable t) {
try {
closeable.close();
} catch (Exception e) {
LOGGER.error("Failed to close the client.", e);
}
throw t;
}
}
@Override
public CheckResult check() {
return closeInitiated ? failed(new IllegalStateException("Reporter is closed.")) : OK;
}
@Override
public void report(final Span span) {
if (closeInitiated) {
throw new IllegalStateException("Span: " + span + " reported after reporter " + this + " is closed.");
}
buffer.onNext(span);
}
@Override
public void close() {
awaitTermination(closeable.closeAsync().toFuture());
}
@Override
public Completable closeAsync() {
return closeable.closeAsync();
}
@Override
public Completable closeAsyncGracefully() {
return closeable.closeAsyncGracefully();
}
private PublisherSource.Processor initReporter(final Builder builder, final HttpClient client) {
final PublisherSource.Processor buffer;
SpanBytesEncoder spanEncoder = builder.codec.spanBytesEncoder();
final BufferAllocator allocator = client.executionContext().bufferAllocator();
final Publisher spans;
if (!builder.batchingEnabled) {
buffer = newPublisherProcessorDropHeadOnOverflow(builder.maxConcurrentReports);
spans = fromSource(buffer)
.map(span -> allocator.wrap(spanEncoder.encodeList(Collections.singletonList(span))));
} else {
// As we send maxConcurrentReports number of parallel requests, each with roughly batchSizeHint number of
// spans, we hold a maximum of that many Spans in-memory that we can send in parallel to the collector.
buffer = newPublisherProcessorDropHeadOnOverflow(builder.batchSizeHint * builder.maxConcurrentReports);
spans = fromSource(buffer)
.buffer(forCountOrTime(builder.batchSizeHint, builder.maxBatchDuration,
() -> new ListAccumulator(builder.batchSizeHint), client.executionContext().executor()))
.filter(accumulate -> !accumulate.isEmpty())
.map(bufferedSpans -> allocator.wrap(spanEncoder.encodeList(bufferedSpans)));
}
final CompletableSource.Processor spansTerminated = newCompletableProcessor();
toSource(spans.flatMapCompletable(encodedSpansReporter(client, builder.codec), builder.maxConcurrentReports))
.subscribe(spansTerminated);
closeable.prepend(toAsyncCloseable(graceful -> {
closeInitiated = true;
try {
buffer.onComplete();
} catch (Throwable t) {
LOGGER.error("Failed to dispose request buffer. Ignoring.", t);
}
return graceful ? fromSource(spansTerminated) : completed();
}));
return buffer;
}
private static Function encodedSpansReporter(final HttpClient client, final Codec codec) {
final String path;
final CharSequence contentType;
switch (codec) {
case JSON_V1:
path = V1_PATH;
contentType = APPLICATION_JSON;
break;
case JSON_V2:
path = V2_PATH;
contentType = APPLICATION_JSON;
break;
case THRIFT:
path = V2_PATH;
contentType = THRIFT_CONTENT_TYPE;
break;
case PROTO3:
path = V2_PATH;
contentType = PROTO_CONTENT_TYPE;
break;
default:
throw new IllegalArgumentException("Unknown codec: " + codec);
}
return encodedSpans -> client.request(
client.post(path).setHeader(CONTENT_TYPE, contentType).payloadBody(encodedSpans))
.beforeOnSuccess(response -> {
HttpResponseStatus status = response.status();
if (status.statusClass() != SUCCESSFUL_2XX) {
LOGGER.info("Unexpected response from the collector. Response headers: {}",
response.toString((__, headerValue) -> headerValue));
}
})
.ignoreElement()
.onErrorComplete(cause -> {
LOGGER.error("Failed to send a span, ignoring.", cause);
return true;
});
}
/**
* A builder to create a new {@link HttpReporter}.
*/
public static final class Builder {
private Codec codec = Codec.JSON_V2;
private final SingleAddressHttpClientBuilder clientBuilder;
private boolean batchingEnabled = true;
private int batchSizeHint = 16;
private int maxConcurrentReports = 32;
private Duration maxBatchDuration = ofSeconds(30);
/**
* Create a new {@link Builder} using the passed {@link SingleAddressHttpClientBuilder}.
*
* @param clientBuilder the collector SocketAddress
*/
public Builder(final SingleAddressHttpClientBuilder clientBuilder) {
this.clientBuilder = clientBuilder;
}
/**
* Sets the {@link Codec} to encode the Spans with.
*
* @param codec the codec to use for this span.
* @return {@code this}
*/
public Builder codec(Codec codec) {
this.codec = requireNonNull(codec);
return this;
}
/**
* Sets the maximum number of concurrent requests that will be made to the zipkin collector at any time.
*
* @param maxConcurrentReports maximum number of concurrent requests that will be made to the zipkin collector
* at any time.
* @return {@code this}.
*/
public Builder maxConcurrentReports(final int maxConcurrentReports) {
if (maxConcurrentReports <= 0) {
throw new IllegalArgumentException("maxConcurrentReports: " + maxConcurrentReports + " (expected > 0)");
}
this.maxConcurrentReports = maxConcurrentReports;
return this;
}
/**
* Configure batching of spans before sending it to the zipkin collector.
*
* @param batchSizeHint Hint of how many spans should be batched together.
* @param maxBatchDuration {@link Duration} of time to wait for {@code batchSizeHint} spans in a batch.
* @return {@code this}.
*/
public Builder batchSpans(final int batchSizeHint, final Duration maxBatchDuration) {
if (batchSizeHint <= 0) {
throw new IllegalArgumentException("batchSizeHint: " + batchSizeHint + " (expected > 0)");
}
batchingEnabled = true;
this.batchSizeHint = batchSizeHint;
this.maxBatchDuration = requireNonNull(maxBatchDuration);
return this;
}
/**
* Configure batching of spans before sending them to the zipkin collector.
* @param enable When {@code false} batching will be disabled.
* @return {@code this}.
*/
public Builder spansBatchingEnabled(boolean enable) {
this.batchingEnabled = enable;
return this;
}
/**
* Builds a new {@link HttpReporter} instance with this builder's options.
*
* @return a new {@link HttpReporter}
*/
public HttpReporter build() {
return new HttpReporter(this);
}
}
private static final class ListAccumulator implements Accumulator> {
private final List accumulate;
ListAccumulator(final int size) {
accumulate = new ArrayList<>(size);
}
@Override
public void accumulate(@Nonnull final Span item) {
accumulate.add(requireNonNull(item));
}
@Override
public List finish() {
return accumulate;
}
}
}
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