| // SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de> |
| // |
| // SPDX-License-Identifier: LGPL-3.0-or-later |
| |
| package eu.mulk.quarkus.googlecloud.jsonlogging; |
| |
| import io.smallrye.common.constraint.Nullable; |
| import java.time.Instant; |
| import java.util.List; |
| import java.util.Map; |
| import javax.json.Json; |
| import javax.json.JsonObject; |
| import javax.json.JsonObjectBuilder; |
| |
| /** |
| * A JSON log entry compatible with Google Cloud Logging. |
| * |
| * <p>Roughly (but not quite) corresponds to Google Cloud Logging's <a |
| * href="https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry">LogEntry</a> |
| * structure. |
| * |
| * <p>A few of the fields are <a href="https://cloud.google.com/logging/docs/structured-logging"> |
| * treated specially</a> by the fluentd instance running in Google Kubernetes Engine. All other |
| * fields end up in the jsonPayload field on the Google Cloud Logging side. |
| */ |
| final class LogEntry { |
| |
| private final String message; |
| private final String severity; |
| private final Timestamp timestamp; |
| @Nullable private final String trace; |
| @Nullable private final String spanId; |
| private final SourceLocation sourceLocation; |
| private final Map<String, String> labels; |
| private final List<StructuredParameter> parameters; |
| private final Map<String, String> mappedDiagnosticContext; |
| @Nullable private final String nestedDiagnosticContext; |
| @Nullable private final String type; |
| |
| LogEntry( |
| String message, |
| String severity, |
| Timestamp timestamp, |
| @Nullable String trace, |
| @Nullable String spanId, |
| SourceLocation sourceLocation, |
| Map<String, String> labels, |
| List<StructuredParameter> parameters, |
| Map<String, String> mappedDiagnosticContext, |
| @Nullable String nestedDiagnosticContext, |
| @Nullable String type) { |
| this.message = message; |
| this.severity = severity; |
| this.timestamp = timestamp; |
| this.trace = trace; |
| this.spanId = spanId; |
| this.sourceLocation = sourceLocation; |
| this.labels = labels; |
| this.parameters = parameters; |
| this.mappedDiagnosticContext = mappedDiagnosticContext; |
| this.nestedDiagnosticContext = nestedDiagnosticContext; |
| this.type = type; |
| } |
| |
| static final class SourceLocation { |
| |
| @Nullable private final String file; |
| @Nullable private final String line; |
| @Nullable private final String function; |
| |
| SourceLocation(@Nullable String file, @Nullable String line, @Nullable String function) { |
| this.file = file; |
| this.line = line; |
| this.function = function; |
| } |
| |
| JsonObject json() { |
| var b = Json.createObjectBuilder(); |
| |
| if (file != null) { |
| b.add("file", file); |
| } |
| |
| if (line != null) { |
| b.add("line", line); |
| } |
| |
| if (function != null) { |
| b.add("function", function); |
| } |
| |
| return b.build(); |
| } |
| } |
| |
| static final class Timestamp { |
| |
| private final long seconds; |
| private final int nanos; |
| |
| Timestamp(long seconds, int nanos) { |
| this.seconds = seconds; |
| this.nanos = nanos; |
| } |
| |
| Timestamp(Instant t) { |
| this(t.getEpochSecond(), t.getNano()); |
| } |
| |
| JsonObject json() { |
| return Json.createObjectBuilder().add("seconds", seconds).add("nanos", nanos).build(); |
| } |
| } |
| |
| JsonObjectBuilder json() { |
| var b = Json.createObjectBuilder(); |
| |
| if (trace != null) { |
| b.add("logging.googleapis.com/trace", trace); |
| } |
| |
| if (spanId != null) { |
| b.add("logging.googleapis.com/spanId", spanId); |
| } |
| |
| if (nestedDiagnosticContext != null && !nestedDiagnosticContext.isEmpty()) { |
| b.add("nestedDiagnosticContext", nestedDiagnosticContext); |
| } |
| |
| if (!labels.isEmpty()) { |
| b.add("logging.googleapis.com/labels", jsonOfStringMap(labels)); |
| } |
| |
| if (type != null) { |
| b.add("@type", type); |
| } |
| |
| return b.add("message", message) |
| .add("severity", severity) |
| .add("timestamp", timestamp.json()) |
| .add("logging.googleapis.com/sourceLocation", sourceLocation.json()) |
| .addAll(jsonOfStringMap(mappedDiagnosticContext)) |
| .addAll(jsonOfParameterMap(parameters)); |
| } |
| |
| private static JsonObjectBuilder jsonOfStringMap(Map<String, String> stringMap) { |
| return stringMap.entrySet().stream() |
| .reduce( |
| Json.createObjectBuilder(), |
| (acc, x) -> acc.add(x.getKey(), x.getValue()), |
| JsonObjectBuilder::addAll); |
| } |
| |
| private static JsonObjectBuilder jsonOfParameterMap(List<StructuredParameter> parameters) { |
| return parameters.stream() |
| .reduce( |
| Json.createObjectBuilder(), |
| (acc, p) -> acc.addAll(p.json()), |
| JsonObjectBuilder::addAll); |
| } |
| } |