Matthias Andreas Benkard | c8144a9 | 2021-05-03 08:04:53 +0200 | [diff] [blame] | 1 | package eu.mulk.quarkus.observability.googlecloud.jsonlogging; |
| 2 | |
| 3 | import java.io.PrintWriter; |
| 4 | import java.io.StringWriter; |
| 5 | import java.util.HashMap; |
| 6 | import java.util.logging.Level; |
| 7 | import javax.json.bind.Jsonb; |
| 8 | import javax.json.bind.JsonbException; |
| 9 | import org.jboss.logmanager.ExtFormatter; |
| 10 | import org.jboss.logmanager.ExtLogRecord; |
| 11 | |
| 12 | /** |
| 13 | * Formats log records as JSON for consumption by Google Cloud Logging. |
| 14 | * |
| 15 | * <p>Meant to be used in containers running on Google Kubernetes Engine (GKE). |
| 16 | * |
| 17 | * @see GoogleCloudLogEntry |
| 18 | */ |
| 19 | class GoogleCloudLoggingFormatter extends ExtFormatter { |
| 20 | |
| 21 | private static final String TRACE_LEVEL = "TRACE"; |
| 22 | private static final String DEBUG_LEVEL = "DEBUG"; |
| 23 | private static final String INFO_LEVEL = "INFO"; |
| 24 | private static final String WARNING_LEVEL = "WARNING"; |
| 25 | private static final String ERROR_LEVEL = "ERROR"; |
| 26 | |
| 27 | private static final String ERROR_EVENT_TYPE = |
| 28 | "type.googleapis.com/google.devtools.clouderrorreporting.v1beta1.ReportedErrorEvent"; |
| 29 | |
| 30 | private final Jsonb jsonb; |
| 31 | |
| 32 | GoogleCloudLoggingFormatter(Jsonb jsonb) { |
| 33 | this.jsonb = jsonb; |
| 34 | } |
| 35 | |
| 36 | @Override |
| 37 | public String format(ExtLogRecord logRecord) { |
| 38 | var message = formatMessageWithStackTrace(logRecord); |
| 39 | |
| 40 | var parameters = new HashMap<String, Object>(); |
| 41 | var labels = new HashMap<String, String>(); |
| 42 | if (logRecord.getParameters() != null) { |
| 43 | for (var parameter : logRecord.getParameters()) { |
| 44 | if (parameter instanceof KeyValueParameter kvparam) { |
| 45 | parameters.put(kvparam.key(), kvparam.value()); |
| 46 | } else if (parameter instanceof Label label) { |
| 47 | labels.put(label.key(), label.value()); |
| 48 | } |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | var mdc = logRecord.getMdcCopy(); |
| 53 | var ndc = logRecord.getNdc(); |
| 54 | |
| 55 | var sourceLocation = |
| 56 | new GoogleCloudLogEntry.SourceLocation( |
Matthias Andreas Benkard | 4bae5f1 | 2021-05-03 19:16:48 +0200 | [diff] [blame^] | 57 | logRecord.getSourceFileName(), |
| 58 | String.valueOf(logRecord.getSourceLineNumber()), |
| 59 | String.format( |
| 60 | "%s.%s", logRecord.getSourceClassName(), logRecord.getSourceMethodName())); |
Matthias Andreas Benkard | c8144a9 | 2021-05-03 08:04:53 +0200 | [diff] [blame] | 61 | |
| 62 | var entry = |
| 63 | new GoogleCloudLogEntry( |
| 64 | message, |
| 65 | severityOf(logRecord.getLevel()), |
| 66 | new GoogleCloudLogEntry.Timestamp(logRecord.getInstant()), |
| 67 | null, |
| 68 | null, |
| 69 | sourceLocation, |
| 70 | labels.isEmpty() ? null : labels, |
| 71 | parameters.isEmpty() ? null : parameters, |
| 72 | mdc.isEmpty() ? null : mdc, |
| 73 | ndc.isEmpty() ? null : ndc, |
| 74 | logRecord.getLevel().intValue() >= 1000 ? ERROR_EVENT_TYPE : null); |
| 75 | |
| 76 | try { |
| 77 | return jsonb.toJson(entry) + "\n"; |
| 78 | } catch (JsonbException e) { |
| 79 | e.printStackTrace(); |
| 80 | return message + "\n"; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Formats the log message corresponding to {@code logRecord} including a stack trace of the |
| 86 | * {@link ExtLogRecord#getThrown()} exception if any. |
| 87 | */ |
| 88 | private String formatMessageWithStackTrace(ExtLogRecord logRecord) { |
| 89 | var messageStringWriter = new StringWriter(); |
| 90 | var messagePrintWriter = new PrintWriter(messageStringWriter); |
| 91 | messagePrintWriter.append(this.formatMessage(logRecord)); |
| 92 | |
| 93 | if (logRecord.getThrown() != null) { |
| 94 | messagePrintWriter.println(); |
| 95 | logRecord.getThrown().printStackTrace(messagePrintWriter); |
| 96 | } |
| 97 | |
| 98 | messagePrintWriter.close(); |
| 99 | return messageStringWriter.toString(); |
| 100 | } |
| 101 | |
Matthias Andreas Benkard | 4bae5f1 | 2021-05-03 19:16:48 +0200 | [diff] [blame^] | 102 | /** Computes the Google Cloud Logging severity corresponding to a given {@link Level}. */ |
Matthias Andreas Benkard | c8144a9 | 2021-05-03 08:04:53 +0200 | [diff] [blame] | 103 | private static String severityOf(Level level) { |
| 104 | if (level.intValue() < 500) { |
| 105 | return TRACE_LEVEL; |
| 106 | } else if (level.intValue() < 700) { |
| 107 | return DEBUG_LEVEL; |
| 108 | } else if (level.intValue() < 900) { |
| 109 | return INFO_LEVEL; |
| 110 | } else if (level.intValue() < 1000) { |
| 111 | return WARNING_LEVEL; |
| 112 | } else { |
| 113 | return ERROR_LEVEL; |
| 114 | } |
| 115 | } |
| 116 | } |