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EcsResource.java
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EcsResource.java
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/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
package io.opentelemetry.sdk.extension.aws.resource;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.api.common.AttributesBuilder;
import io.opentelemetry.sdk.resources.Resource;
import io.opentelemetry.semconv.resource.attributes.ResourceAttributes;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Collections;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A factory for a {@link Resource} which provides information about the current ECS container if
* running on AWS ECS.
*/
public final class EcsResource {
private static final Logger logger = Logger.getLogger(EcsResource.class.getName());
private static final String ECS_METADATA_KEY_V4 = "ECS_CONTAINER_METADATA_URI_V4";
private static final String ECS_METADATA_KEY_V3 = "ECS_CONTAINER_METADATA_URI";
private static final JsonFactory JSON_FACTORY = new JsonFactory();
private static final Resource INSTANCE = buildResource();
/**
* Returns a factory for a {@link Resource} which provides information about the current ECS
* container if running on AWS ECS.
*/
public static Resource get() {
return INSTANCE;
}
private static Resource buildResource() {
return buildResource(System.getenv(), new DockerHelper());
}
// Visible for testing
static Resource buildResource(Map<String, String> sysEnv, DockerHelper dockerHelper) {
if (!isOnEcs(sysEnv)) {
return Resource.empty();
}
AttributesBuilder attrBuilders = Attributes.builder();
attrBuilders.put(ResourceAttributes.CLOUD_PROVIDER, ResourceAttributes.CloudProviderValues.AWS);
attrBuilders.put(
ResourceAttributes.CLOUD_PLATFORM, ResourceAttributes.CloudPlatformValues.AWS_ECS);
try {
String hostName = InetAddress.getLocalHost().getHostName();
attrBuilders.put(ResourceAttributes.CONTAINER_NAME, hostName);
} catch (UnknownHostException e) {
logger.log(Level.WARNING, "Could not get docker container name from hostname.", e);
}
String containerId = dockerHelper.getContainerId();
if (containerId != null && !containerId.isEmpty()) {
attrBuilders.put(ResourceAttributes.CONTAINER_ID, containerId);
}
String metadataUriV4 = sysEnv.getOrDefault(ECS_METADATA_KEY_V4, "");
if (!metadataUriV4.isEmpty()) {
try {
attrBuilders.put(
ResourceAttributes.AWS_ECS_CONTAINER_ARN,
getContainerArn(fetchMetadata(metadataUriV4)));
} catch (Exception e) {
logger.log(
Level.WARNING, "Could not get the container ARN from the Metadata V4 endpoint.", e);
}
try {
String taskMetadata = fetchMetadata(metadataUriV4 + "/task");
try (JsonParser parser = JSON_FACTORY.createParser(taskMetadata)) {
parser.nextToken();
if (!parser.isExpectedStartObjectToken()) {
throw new IOException(
"Invalid JSON returned by the Metadata v4 '/task' endpoint:" + taskMetadata);
}
String taskArn = null;
String cluster = null;
while (parser.nextToken() != JsonToken.END_OBJECT) {
String value = parser.nextTextValue();
switch (parser.getCurrentName()) {
case "Cluster":
/*
* This is not guaranteed to be the Cluster ARN, and we may also need the
* Task ARN to recreate the cluster ARN.
*/
cluster = value;
break;
case "Family":
attrBuilders.put(ResourceAttributes.AWS_ECS_TASK_FAMILY, value);
break;
case "LaunchType":
attrBuilders.put(ResourceAttributes.AWS_ECS_LAUNCHTYPE, value);
break;
case "Revision":
attrBuilders.put(ResourceAttributes.AWS_ECS_TASK_REVISION, value);
break;
case "TaskARN":
taskArn = value;
attrBuilders.put(ResourceAttributes.AWS_ECS_TASK_ARN, value);
break;
default:
parser.skipChildren();
}
}
if (taskArn == null) {
throw new IllegalStateException(
"The 'TaskARN' field was not provided by the Metadata v4 '/task' endpoint:"
+ taskMetadata);
}
if (cluster == null) {
throw new IllegalStateException(
"The 'Cluster' field was not provided by the Metadata v4 '/task' endpoint:"
+ taskMetadata);
} else if (cluster.startsWith("arn:")) {
attrBuilders.put(ResourceAttributes.AWS_ECS_CLUSTER_ARN, cluster);
} else {
String baseArn = taskArn.substring(0, taskArn.lastIndexOf(":"));
attrBuilders.put(
ResourceAttributes.AWS_ECS_CLUSTER_ARN, baseArn + ":cluster/" + cluster);
}
}
} catch (Exception e) {
logger.log(
Level.WARNING,
"Could not extract resource attributes from the Metadata V4 '/task' endpoint.",
e);
}
}
return Resource.create(attrBuilders.build(), ResourceAttributes.SCHEMA_URL);
}
private static boolean isOnEcs(Map<String, String> sysEnv) {
return !sysEnv.getOrDefault(ECS_METADATA_KEY_V3, "").isEmpty()
|| !sysEnv.getOrDefault(ECS_METADATA_KEY_V4, "").isEmpty();
}
private static String getContainerArn(String containerMetadataJson) throws IOException {
JsonParser parser = JSON_FACTORY.createParser(containerMetadataJson);
parser.nextToken();
if (!parser.isExpectedStartObjectToken()) {
throw new IOException(
"Invalid JSON returned by the Metadata v4 endpoint:" + containerMetadataJson);
}
while (parser.nextToken() != JsonToken.END_OBJECT) {
String value = parser.nextTextValue();
switch (parser.getCurrentName()) {
case "ContainerARN":
return value;
default:
parser.skipChildren();
}
}
throw new IllegalStateException(
"The JSON returned by the ECS Metadata V4 endpoint does not contain a 'ContainerARN' field.");
}
private static String fetchMetadata(String url) {
return new SimpleHttpClient().fetchString("GET", url.toString(), Collections.emptyMap(), null);
}
private EcsResource() {}
}