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| 1 | +/* |
| 2 | + * Copyright 2023 Amazon.com, Inc. or its affiliates. |
| 3 | + * Licensed under the Apache License, Version 2.0 (the |
| 4 | + * "License"); you may not use this file except in compliance |
| 5 | + * with the License. You may obtain a copy of the License at |
| 6 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | + * Unless required by applicable law or agreed to in writing, software |
| 8 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 9 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 10 | + * See the License for the specific language governing permissions and |
| 11 | + * limitations under the License. |
| 12 | + * |
| 13 | + */ |
| 14 | + |
| 15 | +package software.amazon.lambda.powertools.metrics.internal; |
| 16 | + |
| 17 | +import java.time.Instant; |
| 18 | +import java.util.HashMap; |
| 19 | +import java.util.Optional; |
| 20 | +import java.util.concurrent.ConcurrentHashMap; |
| 21 | +import java.util.concurrent.ConcurrentMap; |
| 22 | +import java.util.concurrent.atomic.AtomicBoolean; |
| 23 | +import java.util.concurrent.atomic.AtomicReference; |
| 24 | +import java.util.function.Consumer; |
| 25 | + |
| 26 | +import com.amazonaws.services.lambda.runtime.Context; |
| 27 | + |
| 28 | +import software.amazon.lambda.powertools.common.internal.LambdaHandlerProcessor; |
| 29 | +import software.amazon.lambda.powertools.metrics.Metrics; |
| 30 | +import software.amazon.lambda.powertools.metrics.model.DimensionSet; |
| 31 | +import software.amazon.lambda.powertools.metrics.model.MetricResolution; |
| 32 | +import software.amazon.lambda.powertools.metrics.model.MetricUnit; |
| 33 | +import software.amazon.lambda.powertools.metrics.provider.MetricsProvider; |
| 34 | + |
| 35 | +public class RequestScopedMetricsProxy implements Metrics { |
| 36 | + private static final String DEFAULT_TRACE_ID = "DEFAULT"; |
| 37 | + private final ConcurrentMap<String, Metrics> metricsMap = new ConcurrentHashMap<>(); |
| 38 | + private final MetricsProvider provider; |
| 39 | + private final AtomicReference<String> initialNamespace = new AtomicReference<>(); |
| 40 | + private final AtomicReference<DimensionSet> initialDefaultDimensions = new AtomicReference<>(); |
| 41 | + private final AtomicBoolean initialRaiseOnEmptyMetrics = new AtomicBoolean(false); |
| 42 | + |
| 43 | + public RequestScopedMetricsProxy(MetricsProvider provider) { |
| 44 | + this.provider = provider; |
| 45 | + } |
| 46 | + |
| 47 | + private String getTraceId() { |
| 48 | + return LambdaHandlerProcessor.getXrayTraceId().orElse(DEFAULT_TRACE_ID); |
| 49 | + } |
| 50 | + |
| 51 | + private Metrics getOrCreateMetrics() { |
| 52 | + String traceId = getTraceId(); |
| 53 | + return metricsMap.computeIfAbsent(traceId, key -> { |
| 54 | + Metrics metrics = provider.getMetricsInstance(); |
| 55 | + String namespace = initialNamespace.get(); |
| 56 | + if (namespace != null) { |
| 57 | + metrics.setNamespace(namespace); |
| 58 | + } |
| 59 | + DimensionSet dimensions = initialDefaultDimensions.get(); |
| 60 | + if (dimensions != null) { |
| 61 | + metrics.setDefaultDimensions(dimensions); |
| 62 | + } |
| 63 | + metrics.setRaiseOnEmptyMetrics(initialRaiseOnEmptyMetrics.get()); |
| 64 | + return metrics; |
| 65 | + }); |
| 66 | + } |
| 67 | + |
| 68 | + // Configuration methods - called by MetricsFactory and MetricsBuilder |
| 69 | + // These methods DO NOT eagerly create instances because they are typically called |
| 70 | + // outside the Lambda handler (e.g., during class initialization) potentially on a different thread. |
| 71 | + // We delay instance creation until the first operation that needs the metrics backend (e.g., addMetric). |
| 72 | + // See {@link software.amazon.lambda.powertools.metrics.MetricsFactory#getMetricsInstance()} |
| 73 | + // and {@link software.amazon.lambda.powertools.metrics.MetricsBuilder#build()} |
| 74 | + |
| 75 | + @Override |
| 76 | + public void setNamespace(String namespace) { |
| 77 | + this.initialNamespace.set(namespace); |
| 78 | + Optional.ofNullable(metricsMap.get(getTraceId())).ifPresent(m -> m.setNamespace(namespace)); |
| 79 | + } |
| 80 | + |
| 81 | + @Override |
| 82 | + public void setDefaultDimensions(DimensionSet dimensionSet) { |
| 83 | + if (dimensionSet == null) { |
| 84 | + throw new IllegalArgumentException("DimensionSet cannot be null"); |
| 85 | + } |
| 86 | + this.initialDefaultDimensions.set(dimensionSet); |
| 87 | + Optional.ofNullable(metricsMap.get(getTraceId())).ifPresent(m -> m.setDefaultDimensions(dimensionSet)); |
| 88 | + } |
| 89 | + |
| 90 | + @Override |
| 91 | + public void setRaiseOnEmptyMetrics(boolean raiseOnEmptyMetrics) { |
| 92 | + this.initialRaiseOnEmptyMetrics.set(raiseOnEmptyMetrics); |
| 93 | + Optional.ofNullable(metricsMap.get(getTraceId())).ifPresent(m -> m.setRaiseOnEmptyMetrics(raiseOnEmptyMetrics)); |
| 94 | + } |
| 95 | + |
| 96 | + @Override |
| 97 | + public DimensionSet getDefaultDimensions() { |
| 98 | + Metrics metrics = metricsMap.get(getTraceId()); |
| 99 | + if (metrics != null) { |
| 100 | + return metrics.getDefaultDimensions(); |
| 101 | + } |
| 102 | + DimensionSet dimensions = initialDefaultDimensions.get(); |
| 103 | + return dimensions != null ? dimensions : DimensionSet.of(new HashMap<>()); |
| 104 | + } |
| 105 | + |
| 106 | + // Metrics operations - these eagerly create instances |
| 107 | + |
| 108 | + @Override |
| 109 | + public void addMetric(String key, double value, MetricUnit unit, MetricResolution resolution) { |
| 110 | + getOrCreateMetrics().addMetric(key, value, unit, resolution); |
| 111 | + } |
| 112 | + |
| 113 | + @Override |
| 114 | + public void addDimension(DimensionSet dimensionSet) { |
| 115 | + getOrCreateMetrics().addDimension(dimensionSet); |
| 116 | + } |
| 117 | + |
| 118 | + @Override |
| 119 | + public void setTimestamp(Instant timestamp) { |
| 120 | + getOrCreateMetrics().setTimestamp(timestamp); |
| 121 | + } |
| 122 | + |
| 123 | + @Override |
| 124 | + public void addMetadata(String key, Object value) { |
| 125 | + getOrCreateMetrics().addMetadata(key, value); |
| 126 | + } |
| 127 | + |
| 128 | + @Override |
| 129 | + public void clearDefaultDimensions() { |
| 130 | + getOrCreateMetrics().clearDefaultDimensions(); |
| 131 | + } |
| 132 | + |
| 133 | + @Override |
| 134 | + public void flush() { |
| 135 | + // Always create instance to ensure validation and warnings are triggered. E.g. when raiseOnEmptyMetrics |
| 136 | + // is enabled. |
| 137 | + Metrics metrics = getOrCreateMetrics(); |
| 138 | + metrics.flush(); |
| 139 | + metricsMap.remove(getTraceId()); |
| 140 | + } |
| 141 | + |
| 142 | + @Override |
| 143 | + public void captureColdStartMetric(Context context, DimensionSet dimensions) { |
| 144 | + getOrCreateMetrics().captureColdStartMetric(context, dimensions); |
| 145 | + } |
| 146 | + |
| 147 | + @Override |
| 148 | + public void captureColdStartMetric(DimensionSet dimensions) { |
| 149 | + getOrCreateMetrics().captureColdStartMetric(dimensions); |
| 150 | + } |
| 151 | + |
| 152 | + @Override |
| 153 | + public void flushMetrics(Consumer<Metrics> metricsConsumer) { |
| 154 | + getOrCreateMetrics().flushMetrics(metricsConsumer); |
| 155 | + } |
| 156 | +} |
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