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| 1 | +// Copyright 2021-2022 Workiva. |
| 2 | +// Licensed under the Apache License, Version 2.0. Please see https://github.com/Workiva/opentelemetry-dart/blob/master/LICENSE for more information |
| 3 | + |
| 4 | +import 'dart:async'; |
| 5 | + |
| 6 | +import 'package:fixnum/fixnum.dart'; |
| 7 | +import 'package:http/http.dart' as http; |
| 8 | +import 'package:logging/logging.dart'; |
| 9 | +import 'package:opentelemetry/api.dart' as api; |
| 10 | +import 'package:opentelemetry/sdk.dart' as sdk; |
| 11 | +import 'package:opentelemetry/src/experimental_api.dart' as api; |
| 12 | +import 'package:opentelemetry/src/experimental_sdk.dart' as sdk; |
| 13 | + |
| 14 | +import '../../proto/opentelemetry/proto/collector/logs/v1/logs_service.pb.dart' as pb_logs_service; |
| 15 | +import '../../proto/opentelemetry/proto/common/v1/common.pb.dart' as pb_common; |
| 16 | +import '../../proto/opentelemetry/proto/logs/v1/logs.pb.dart' as pb_logs; |
| 17 | +import '../../proto/opentelemetry/proto/logs/v1/logs.pbenum.dart' as pg_logs_enum; |
| 18 | +import '../../proto/opentelemetry/proto/resource/v1/resource.pb.dart' as pb_resource; |
| 19 | + |
| 20 | +class OTLPLogExporter implements sdk.LogRecordExporter { |
| 21 | + final Logger _log = Logger('opentelemetry.LogCollectorExporter'); |
| 22 | + |
| 23 | + final Uri uri; |
| 24 | + final http.Client client; |
| 25 | + final Map<String, String> headers; |
| 26 | + var _isShutdown = false; |
| 27 | + |
| 28 | + OTLPLogExporter( |
| 29 | + this.uri, { |
| 30 | + http.Client? httpClient, |
| 31 | + this.headers = const {}, |
| 32 | + }) : client = httpClient ?? http.Client(); |
| 33 | + |
| 34 | + @override |
| 35 | + Future<sdk.ExportResult> export(List<sdk.ReadableLogRecord> logRecords) async { |
| 36 | + if (_isShutdown) { |
| 37 | + return sdk.ExportResult( |
| 38 | + code: sdk.ExportResultCode.failed, |
| 39 | + ); |
| 40 | + } |
| 41 | + |
| 42 | + if (logRecords.isEmpty) { |
| 43 | + return sdk.ExportResult( |
| 44 | + code: sdk.ExportResultCode.success, |
| 45 | + ); |
| 46 | + } |
| 47 | + |
| 48 | + return _send(uri, logRecords).then((_) { |
| 49 | + return sdk.ExportResult( |
| 50 | + code: sdk.ExportResultCode.success, |
| 51 | + ); |
| 52 | + }).catchError((e, st) { |
| 53 | + return sdk.ExportResult( |
| 54 | + code: sdk.ExportResultCode.failed, |
| 55 | + error: e, |
| 56 | + stackTrace: st, |
| 57 | + ); |
| 58 | + }); |
| 59 | + } |
| 60 | + |
| 61 | + Future<void> _send( |
| 62 | + Uri uri, |
| 63 | + List<sdk.ReadableLogRecord> logRecords, |
| 64 | + ) async { |
| 65 | + try { |
| 66 | + final body = pb_logs_service.ExportLogsServiceRequest(resourceLogs: _logsToProtobuf(logRecords)); |
| 67 | + |
| 68 | + final headers = {'Content-Type': 'application/x-protobuf'}..addAll(this.headers); |
| 69 | + |
| 70 | + await client.post(uri, body: body.writeToBuffer(), headers: headers); |
| 71 | + } catch (e) { |
| 72 | + _log.warning('Failed to export ${logRecords.length} logs.', e); |
| 73 | + } |
| 74 | + } |
| 75 | + |
| 76 | + @override |
| 77 | + Future<void> shutdown() async { |
| 78 | + _isShutdown = true; |
| 79 | + client.close(); |
| 80 | + } |
| 81 | + |
| 82 | + /// Group and construct the protobuf equivalent of the given list of [api.LogRecord]s. |
| 83 | + /// Logs are grouped by a trace provider's [sdk.Resource] and a tracer's |
| 84 | + /// [sdk.InstrumentationScope]. |
| 85 | + Iterable<pb_logs. ResourceLogs> _logsToProtobuf( List<sdk. ReadableLogRecord> logRecords) { |
| 86 | + // use a map of maps to group spans by resource and instrumentation library |
| 87 | + final rsm = <sdk. Resource, Map<sdk. InstrumentationScope, List<pb_logs. LogRecord>> >{}; |
| 88 | + for (final logRecord in logRecords) { |
| 89 | + final il = rsm[logRecord.resource] ?? <sdk. InstrumentationScope, List<pb_logs. LogRecord> >{}; |
| 90 | + |
| 91 | + if (logRecord.instrumentationScope != null) { |
| 92 | + il[logRecord.instrumentationScope!] = il[logRecord.instrumentationScope] ?? <pb_logs.LogRecord>[] |
| 93 | + ..add(_logToProtobuf(logRecord)); |
| 94 | + } |
| 95 | + if (logRecord.resource != null) { |
| 96 | + rsm[logRecord.resource!] = il; |
| 97 | + } |
| 98 | + } |
| 99 | + |
| 100 | + final rss = <pb_logs.ResourceLogs>[]; |
| 101 | + for (final il in rsm.entries) { |
| 102 | + // for each distinct resource, construct the protobuf equivalent |
| 103 | + final attrs = <pb_common.KeyValue>[]; |
| 104 | + for (final attr in il.key.attributes.keys) { |
| 105 | + attrs.add(pb_common.KeyValue(key: attr, value: _attributeValueToProtobuf(il.key.attributes.get(attr)!))); |
| 106 | + } |
| 107 | + |
| 108 | + final rs = pb_logs.ResourceLogs(resource: pb_resource.Resource(attributes: attrs)); |
| 109 | + // for each distinct instrumentation library, construct the protobuf equivalent |
| 110 | + for (final ils in il.value.entries) { |
| 111 | + rs.scopeLogs.add(pb_logs.ScopeLogs( |
| 112 | + logRecords: ils.value, |
| 113 | + scope: pb_common.InstrumentationScope(name: ils.key.name, version: ils.key.version))); |
| 114 | + } |
| 115 | + rss.add(rs); |
| 116 | + } |
| 117 | + return rss; |
| 118 | + } |
| 119 | + |
| 120 | + pb_logs.LogRecord _logToProtobuf(sdk.ReadableLogRecord log) { |
| 121 | + var spanId = <int>[]; |
| 122 | + var traceId = <int>[]; |
| 123 | + if (log.spanContext != null) { |
| 124 | + spanId = log.spanContext!.spanId.get(); |
| 125 | + traceId = log.spanContext!.traceId.get(); |
| 126 | + } |
| 127 | + return pb_logs.LogRecord( |
| 128 | + timeUnixNano: log.timeStamp, |
| 129 | + severityNumber: |
| 130 | + log.severityNumber != null ? pg_logs_enum.SeverityNumber.valueOf(log.severityNumber!.index) : null, |
| 131 | + severityText: log.severityText, |
| 132 | + droppedAttributesCount: log.droppedAttributesCount, |
| 133 | + body: _attributeONEValueToProtobuf(log.body), |
| 134 | + attributes: (log.attributes?.keys ?? []) |
| 135 | + .map((key) => pb_common.KeyValue(key: key, value: _attributeValueToProtobuf(log.attributes!.get(key)!))), |
| 136 | + spanId: spanId, |
| 137 | + traceId: traceId, |
| 138 | + observedTimeUnixNano: log.observedTimestamp); |
| 139 | + } |
| 140 | + |
| 141 | + pb_common.AnyValue _attributeONEValueToProtobuf(Object value) { |
| 142 | + switch (value.runtimeType) { |
| 143 | + case String: |
| 144 | + return pb_common.AnyValue(stringValue: value as String); |
| 145 | + case bool: |
| 146 | + return pb_common.AnyValue(boolValue: value as bool); |
| 147 | + case double: |
| 148 | + return pb_common.AnyValue(doubleValue: value as double); |
| 149 | + case int: |
| 150 | + return pb_common.AnyValue(intValue: Int64(value as int)); |
| 151 | + } |
| 152 | + return pb_common.AnyValue(); |
| 153 | + } |
| 154 | + |
| 155 | + pb_common.AnyValue _attributeValueToProtobuf(Object value) { |
| 156 | + if (value is String) { |
| 157 | + return pb_common.AnyValue(stringValue: value); |
| 158 | + } |
| 159 | + if (value is bool) { |
| 160 | + return pb_common.AnyValue(boolValue: value); |
| 161 | + } |
| 162 | + if (value is double) { |
| 163 | + return pb_common.AnyValue(doubleValue: value); |
| 164 | + } |
| 165 | + if (value is int) { |
| 166 | + return pb_common.AnyValue(intValue: Int64(value)); |
| 167 | + } |
| 168 | + if (value is List<String> || value is List<bool> || value is List<double> || value is List<int>) { |
| 169 | + final output = <pb_common.AnyValue>[]; |
| 170 | + final values = value as List; |
| 171 | + for (final i in values) { |
| 172 | + output.add(_attributeValueToProtobuf(i)); |
| 173 | + } |
| 174 | + return pb_common.AnyValue(arrayValue: pb_common.ArrayValue(values: output)); |
| 175 | + } |
| 176 | + return pb_common.AnyValue(); |
| 177 | + } |
| 178 | +} |
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