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// Copyright Yahoo. 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.model.DimensionId;
import ai.vespa.metricsproxy.metric.model.MetricId;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.io.InputStream;
import java.time.Instant;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import static ai.vespa.metricsproxy.metric.model.DimensionId.toDimensionId;
/**
* Fetch metrics for a given vespa service
*
* @author Jo Kristian Bergum
*/
public class MetricsParser {
public interface Consumer {
void consume(Metric metric);
}
private static final ObjectMapper jsonMapper = new ObjectMapper();
public static void parse(String data, Consumer consumer) throws IOException {
parse(jsonMapper.createParser(data), consumer);
}
static void parse(InputStream data, Consumer consumer) throws IOException {
parse(jsonMapper.createParser(data), consumer);
}
private static void parse(JsonParser parser, Consumer consumer) throws IOException {
if (parser.nextToken() != JsonToken.START_OBJECT) {
throw new IOException("Expected start of object, got " + parser.currentToken());
}
for (parser.nextToken(); parser.getCurrentToken() != JsonToken.END_OBJECT; parser.nextToken()) {
String fieldName = parser.getCurrentName();
JsonToken token = parser.nextToken();
if (fieldName.equals("metrics")) {
parseMetrics(parser, consumer);
} else {
if (token == JsonToken.START_OBJECT || token == JsonToken.START_ARRAY) {
parser.skipChildren();
}
}
}
}
static private Instant parseSnapshot(JsonParser parser) throws IOException {
if (parser.getCurrentToken() != JsonToken.START_OBJECT) {
throw new IOException("Expected start of 'snapshot' object, got " + parser.currentToken());
}
Instant timestamp = Instant.now();
for (parser.nextToken(); parser.getCurrentToken() != JsonToken.END_OBJECT; parser.nextToken()) {
String fieldName = parser.getCurrentName();
JsonToken token = parser.nextToken();
if (fieldName.equals("to")) {
timestamp = Instant.ofEpochSecond(parser.getLongValue());
timestamp = Instant.ofEpochSecond(Metric.adjustTime(timestamp.getEpochSecond(), Instant.now().getEpochSecond()));
} else {
if (token == JsonToken.START_OBJECT || token == JsonToken.START_ARRAY) {
parser.skipChildren();
}
}
}
return timestamp;
}
static private void parseMetricValues(JsonParser parser, Instant timestamp, Consumer consumer) throws IOException {
if (parser.getCurrentToken() != JsonToken.START_ARRAY) {
throw new IOException("Expected start of 'metrics:values' array, got " + parser.currentToken());
}
Map<Long, Map<DimensionId, String>> uniqueDimensions = new HashMap<>();
while (parser.nextToken() == JsonToken.START_OBJECT) {
handleValue(parser, timestamp, consumer, uniqueDimensions);
}
}
static private void parseMetrics(JsonParser parser, Consumer consumer) throws IOException {
if (parser.getCurrentToken() != JsonToken.START_OBJECT) {
throw new IOException("Expected start of 'metrics' object, got " + parser.currentToken());
}
Instant timestamp = Instant.now();
for (parser.nextToken(); parser.getCurrentToken() != JsonToken.END_OBJECT; parser.nextToken()) {
String fieldName = parser.getCurrentName();
JsonToken token = parser.nextToken();
if (fieldName.equals("snapshot")) {
timestamp = parseSnapshot(parser);
} else if (fieldName.equals("values")) {
parseMetricValues(parser, timestamp, consumer);
} else {
if (token == JsonToken.START_OBJECT || token == JsonToken.START_ARRAY) {
parser.skipChildren();
}
}
}
}
private static Map<DimensionId, String> parseDimensions(JsonParser parser,
Map<Long, Map<DimensionId, String>> uniqueDimensions) throws IOException {
List<Map.Entry<String, String>> dims = new ArrayList<>();
int keyHash = 0;
int valueHash = 0;
for (parser.nextToken(); parser.getCurrentToken() != JsonToken.END_OBJECT; parser.nextToken()) {
String fieldName = parser.getCurrentName();
JsonToken token = parser.nextToken();
if (token == JsonToken.VALUE_STRING){
String value = parser.getValueAsString();
dims.add(Map.entry(fieldName, value));
keyHash ^= fieldName.hashCode();
valueHash ^= value.hashCode();
} else if (token == JsonToken.VALUE_NULL) {
// TODO Should log a warning if this happens
} else {
throw new IllegalArgumentException("Dimension '" + fieldName + "' must be a string");
}
}
Long uniqueKey = (((long) keyHash) << 32) | (valueHash & 0xffffffffL);
return uniqueDimensions.computeIfAbsent(uniqueKey, key -> dims.stream().collect(Collectors.toUnmodifiableMap(e -> toDimensionId(e.getKey()), Map.Entry::getValue)));
}
private static List<Map.Entry<String, Number>> parseValues(String prefix, JsonParser parser) throws IOException {
List<Map.Entry<String, Number>> metrics = new ArrayList<>();
for (parser.nextToken(); parser.getCurrentToken() != JsonToken.END_OBJECT; parser.nextToken()) {
String fieldName = parser.getCurrentName();
JsonToken token = parser.nextToken();
String metricName = prefix + fieldName;
if (token == JsonToken.VALUE_NUMBER_INT) {
metrics.add(Map.entry(metricName, parser.getLongValue()));
} else if (token == JsonToken.VALUE_NUMBER_FLOAT) {
metrics.add(Map.entry(metricName, parser.getValueAsDouble()));
} else {
throw new IllegalArgumentException("Value for aggregator '" + fieldName + "' is not a number");
}
}
return metrics;
}
static private void handleValue(JsonParser parser, Instant timestamp, Consumer consumer,
Map<Long, Map<DimensionId, String>> uniqueDimensions) throws IOException {
String name = "";
String description = "";
Map<DimensionId, String> dim = Map.of();
List<Map.Entry<String, Number>> values = List.of();
for (parser.nextToken(); parser.getCurrentToken() != JsonToken.END_OBJECT; parser.nextToken()) {
String fieldName = parser.getCurrentName();
JsonToken token = parser.nextToken();
if (fieldName.equals("name")) {
name = parser.getText();
} else if (fieldName.equals("description")) {
description = parser.getText();
} else if (fieldName.equals("dimensions")) {
dim = parseDimensions(parser, uniqueDimensions);
} else if (fieldName.equals("values")) {
values = parseValues(name+".", parser);
} else {
if (token == JsonToken.START_OBJECT || token == JsonToken.START_ARRAY) {
parser.skipChildren();
}
}
}
for (Map.Entry<String, Number> value : values) {
consumer.consume(new Metric(MetricId.toMetricId(value.getKey()), value.getValue(), timestamp, dim, description));
}
}
}
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