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// Copyright 2020 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.metricsproxy.service;
import ai.vespa.metricsproxy.metric.Metric;
import ai.vespa.metricsproxy.metric.Metrics;
import ai.vespa.metricsproxy.metric.model.DimensionId;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import static ai.vespa.metricsproxy.metric.model.DimensionId.toDimensionId;
/**
* Fetch metrics for a given vespa service
*
* @author Jo Kristian Bergum
*/
public class MetricsParser {
private static final ObjectMapper jsonMapper = new ObjectMapper();
static Metrics parse(String data) throws IOException {
return parse(jsonMapper.createParser(data));
}
static Metrics parse(byte [] data) throws IOException {
return parse(jsonMapper.createParser(data));
}
private static Metrics parse(JsonParser parser) throws IOException {
if (parser.nextToken() != JsonToken.START_OBJECT) {
throw new IOException("Expected start of object, got " + parser.currentToken());
}
Metrics metrics = new Metrics();
for (parser.nextToken(); parser.getCurrentToken() != JsonToken.END_OBJECT; parser.nextToken()) {
String fieldName = parser.getCurrentName();
JsonToken token = parser.nextToken();
if (fieldName.equals("metrics")) {
metrics = parseMetrics(parser);
} else {
if (token == JsonToken.START_OBJECT || token == JsonToken.START_ARRAY) {
parser.skipChildren();
}
}
}
return metrics;
}
static private Metrics parseSnapshot(JsonParser parser) throws IOException {
if (parser.getCurrentToken() != JsonToken.START_OBJECT) {
throw new IOException("Expected start of 'snapshot' object, got " + parser.currentToken());
}
Metrics metrics = new Metrics();
for (parser.nextToken(); parser.getCurrentToken() != JsonToken.END_OBJECT; parser.nextToken()) {
String fieldName = parser.getCurrentName();
JsonToken token = parser.nextToken();
if (fieldName.equals("to")) {
long timestamp = parser.getLongValue();
long now = System.currentTimeMillis() / 1000;
timestamp = Metric.adjustTime(timestamp, now);
metrics = new Metrics(timestamp);
} else {
if (token == JsonToken.START_OBJECT || token == JsonToken.START_ARRAY) {
parser.skipChildren();
}
}
}
return metrics;
}
static private void parseValues(JsonParser parser, Metrics metrics) throws IOException {
if (parser.getCurrentToken() != JsonToken.START_ARRAY) {
throw new IOException("Expected start of 'metrics:values' array, got " + parser.currentToken());
}
Map<String, Map<DimensionId, String>> uniqueDimensions = new HashMap<>();
while (parser.nextToken() == JsonToken.START_OBJECT) {
// read everything from this START_OBJECT to the matching END_OBJECT
// and return it as a tree model ObjectNode
JsonNode value = jsonMapper.readTree(parser);
handleValue(value, metrics.getTimeStamp(), metrics, uniqueDimensions);
// do whatever you need to do with this object
}
}
static private Metrics parseMetrics(JsonParser parser) throws IOException {
if (parser.getCurrentToken() != JsonToken.START_OBJECT) {
throw new IOException("Expected start of 'metrics' object, got " + parser.currentToken());
}
Metrics metrics = new Metrics();
for (parser.nextToken(); parser.getCurrentToken() != JsonToken.END_OBJECT; parser.nextToken()) {
String fieldName = parser.getCurrentName();
JsonToken token = parser.nextToken();
if (fieldName.equals("snapshot")) {
metrics = parseSnapshot(parser);
} else if (fieldName.equals("values")) {
parseValues(parser, metrics);
} else {
if (token == JsonToken.START_OBJECT || token == JsonToken.START_ARRAY) {
parser.skipChildren();
}
}
}
return metrics;
}
static private void handleValue(JsonNode metric, long timestamp, Metrics metrics, Map<String, Map<DimensionId, String>> uniqueDimensions) {
String name = metric.get("name").textValue();
String description = "";
if (metric.has("description")) {
description = metric.get("description").textValue();
}
Map<DimensionId, String> dim = Collections.emptyMap();
if (metric.has("dimensions")) {
JsonNode dimensions = metric.get("dimensions");
StringBuilder sb = new StringBuilder();
for (Iterator<?> it = dimensions.fieldNames(); it.hasNext(); ) {
String k = (String) it.next();
String v = dimensions.get(k).asText();
sb.append(toDimensionId(k)).append(v);
}
if ( ! uniqueDimensions.containsKey(sb.toString())) {
dim = new HashMap<>();
for (Iterator<?> it = dimensions.fieldNames(); it.hasNext(); ) {
String k = (String) it.next();
String v = dimensions.get(k).textValue();
dim.put(toDimensionId(k), v);
}
uniqueDimensions.put(sb.toString(), Collections.unmodifiableMap(dim));
}
dim = uniqueDimensions.get(sb.toString());
}
JsonNode aggregates = metric.get("values");
for (Iterator<?> it = aggregates.fieldNames(); it.hasNext(); ) {
String aggregator = (String) it.next();
JsonNode aggregatorValue = aggregates.get(aggregator);
if (aggregatorValue == null) {
throw new IllegalArgumentException("Value for aggregator '" + aggregator + "' is missing");
}
Number value = aggregatorValue.numberValue();
if (value == null) {
throw new IllegalArgumentException("Value for aggregator '" + aggregator + "' is not a number");
}
StringBuilder metricName = (new StringBuilder()).append(name).append(".").append(aggregator);
metrics.add(new Metric(metricName.toString(), value, timestamp, dim, description));
}
}
}
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