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/*
* Copyright 2022 VMware, Inc.
*
* 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 io.micrometer.registry.otlp;
import io.micrometer.core.instrument.config.InvalidConfigurationException;
import io.micrometer.core.instrument.config.validate.Validated;
import io.micrometer.core.instrument.push.PushRegistryConfig;
import java.net.URLDecoder;
import java.util.Arrays;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;
import static io.micrometer.core.instrument.config.MeterRegistryConfigValidator.*;
import static io.micrometer.core.instrument.config.validate.PropertyValidator.getString;
import static io.micrometer.core.instrument.config.validate.PropertyValidator.getUrlString;
import static io.micrometer.core.instrument.config.validate.PropertyValidator.getEnum;
/**
* Config for {@link OtlpMeterRegistry}.
*
* @author Tommy Ludwig
* @author Lenin Jaganathan
* @since 1.9.0
*/
public interface OtlpConfig extends PushRegistryConfig {
/**
* Configuration with default values.
*/
OtlpConfig DEFAULT = key -> null;
@Override
default String prefix() {
return "otlp";
}
/**
* Defaults to http://localhost:4318/v1/metrics
* @return address to where metrics will be published.
*/
default String url() {
return getUrlString(this, "url").orElse("http://localhost:4318/v1/metrics");
}
/**
* Attributes to set on the Resource that will be used for all metrics published. This
* should include a {@code service.name} attribute that identifies your service.
*
* By default, resource attributes will load using the {@link #get(String)} method,
* extracting key values from a comma-separated list in the format
* {@code key1=value1,key2=value2}. Resource attributes will be loaded from the
* {@code OTEL_RESOURCE_ATTRIBUTES} environment variable and the service name from the
* {@code OTEL_SERVICE_NAME} environment variable if they are set and
* {@link #get(String)} does not return a value.
* @return map of key value pairs to use as resource attributes
* @see OpenTelemetry
* Resource Semantic Conventions
*/
default Map resourceAttributes() {
Map env = System.getenv();
String resourceAttributesConfig = getString(this, "resourceAttributes")
.orElse(env.get("OTEL_RESOURCE_ATTRIBUTES"));
String[] splitResourceAttributesString = resourceAttributesConfig == null ? new String[] {}
: resourceAttributesConfig.trim().split(",");
Map resourceAttributes = Arrays.stream(splitResourceAttributesString)
.map(String::trim)
.filter(keyValue -> keyValue.length() > 2 && keyValue.indexOf('=') > 0)
.collect(Collectors.toMap(keyvalue -> keyvalue.substring(0, keyvalue.indexOf('=')).trim(),
keyValue -> keyValue.substring(keyValue.indexOf('=') + 1).trim()));
if (env.containsKey("OTEL_SERVICE_NAME") && !resourceAttributes.containsKey("service.name")) {
resourceAttributes.put("service.name", env.get("OTEL_SERVICE_NAME"));
}
return resourceAttributes;
}
/**
* {@link AggregationTemporality} of the OtlpMeterRegistry. This determines whether
* the meters should be cumulative(AGGREGATION_TEMPORALITY_CUMULATIVE) or
* step/delta(AGGREGATION_TEMPORALITY_DELTA).
* @return the aggregationTemporality for OtlpMeterRegistry
* @see OTLP
* Temporality
* @since 1.11.0
*/
default AggregationTemporality aggregationTemporality() {
return getEnum(this, AggregationTemporality.class, "aggregationTemporality")
.orElse(AggregationTemporality.CUMULATIVE);
}
/**
* Additional headers to send with exported metrics. This may be needed for
* authorization headers, for example.
*
* By default, headers will be loaded from {@link #get(String)}. If that is not set,
* they will be taken from the environment variables
* {@code OTEL_EXPORTER_OTLP_HEADERS} and {@code OTEL_EXPORTER_OTLP_METRICS_HEADERS}.
* The header key-value pairs are expected to be in a comma-separated list in the
* format {@code key1=value1,key2=value2}. If a header is set in both
* {@code OTEL_EXPORTER_OTLP_HEADERS} and {@code OTEL_EXPORTER_OTLP_METRICS_HEADERS},
* the header in the latter will overwrite the former.
* @return a map of the headers' key-value pairs
* @see OTLP
* Exporer headers configuration
* @since 1.11.0
*/
default Map headers() {
String headersString = getString(this, "headers").orElse(null);
if (headersString == null) {
Map env = System.getenv();
// common headers
headersString = env.getOrDefault("OTEL_EXPORTER_OTLP_HEADERS", "").trim();
String metricsHeaders = env.getOrDefault("OTEL_EXPORTER_OTLP_METRICS_HEADERS", "").trim();
headersString = Objects.equals(headersString, "") ? metricsHeaders : headersString + "," + metricsHeaders;
try {
// headers are encoded as URL - see
// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md#specifying-headers-via-environment-variables
headersString = URLDecoder.decode(headersString, "UTF-8");
}
catch (Exception e) {
throw new InvalidConfigurationException("Cannot URL decode header value: " + headersString, e);
}
}
String[] keyValues = Objects.equals(headersString, "") ? new String[] {} : headersString.split(",");
return Arrays.stream(keyValues)
.map(String::trim)
.filter(keyValue -> keyValue.length() > 2 && keyValue.indexOf('=') > 0)
.collect(Collectors.toMap(keyValue -> keyValue.substring(0, keyValue.indexOf('=')).trim(),
keyValue -> keyValue.substring(keyValue.indexOf('=') + 1).trim(), (l, r) -> r));
}
@Override
default Validated validate() {
return checkAll(this, c -> PushRegistryConfig.validate(c), checkRequired("url", OtlpConfig::url),
check("resourceAttributes", OtlpConfig::resourceAttributes),
check("aggregationTemporality", OtlpConfig::aggregationTemporality));
}
}