chore: Refactor OTEL bridge signals setup

lib/otel/logs/index.js

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2025 New Relic Corporation. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+'use strict'
+
+const logsApi = require('@opentelemetry/api-logs')
+const logsSdk = require('@opentelemetry/sdk-logs')
+const {
+  isApplicationLoggingEnabled,
+  isLogForwardingEnabled,
+  isMetricsEnabled,
+  incrementLoggingLinesMetrics
+} = require('#agentlib/util/application-logging.js')
+
+const defaultLogger = require('../../logger').child({ component: 'opentelemetry-metrics' })
+const SetupSignal = require('../setup-signal.js')
+const NewRelicLoggerProvider = require('./proxying-provider.js')
+const NoOpExporter = require('./no-op-exporter.js')
+const normalizeTimestamp = require('./normalize-timestamp.js')
+const severityToString = require('./severity-to-string.js')
+
+class SetupLogs extends SetupSignal {
+  constructor({ agent, logger = defaultLogger } = {}) {
+    super({ agent, logger })
+
+    if (isApplicationLoggingEnabled(agent.config) === false) {
+      logger.info('application logging disabled, skipping otel logs setup')
+      return
+    }
+
+    agent.metrics
+      .getOrCreateMetric('Supportability/Nodejs/OpenTelemetryBridge/Logs')
+      .incrementCallCount()
+
+    const exporter = new NoOpExporter()
+    const processor = new logsSdk.BatchLogRecordProcessor(exporter)
+    const otelProvider = new logsSdk.LoggerProvider({
+      processors: [processor]
+    })
+    const provider = new NewRelicLoggerProvider({
+      agent,
+      provider: otelProvider,
+      emitHandler: nrEmitHandler
+    })
+    logsApi.logs.setGlobalLoggerProvider(provider)
+
+    function nrEmitHandler(record) {
+      const level = severityToString(record.severityNumber ?? 0)
+      if (isMetricsEnabled(agent.config) === true) {
+        incrementLoggingLinesMetrics(level, agent.metrics)
+      }
+
+      // TODO: if we decide to support local decorating, implement it here
+
+      if (isLogForwardingEnabled(agent.config, agent) === true) {
+        const meta = agent.getLinkingMetadata(true)
+        const timestamp = normalizeTimestamp(record.timestamp)
+        const logData = {
+          message: record.body,
+          level,
+          timestamp,
+          ...record.attributes,
+          ...meta
+        }
+
+        agent.logs.add(logData)
+      }
+    }
+
+    agent.emit('otelLogsBootstrapped')
+  }
+
+  teardown() {
+    logsApi.logs.disable()
+  }
+}
+
+module.exports = SetupLogs