Google Cloud Logging Transport for LogLayer

Implements the Google Cloud Logging library for use with LogLayer.

This transport sends logs to Google Cloud Logging (formerly known as Stackdriver Logging).

Installation

npm install @loglayer/transport-google-cloud-logging @google-cloud/logging serialize-error

Notes

This transport uses log.entry(metadata, data) as described in the library documentation.

• The metadata portion is not the data from withMetadata() or withContext(). See the rootLevelData option for this transport on how to modify this value.
• The data portion is actually the jsonPayload is what the transport uses for all LogLayer data.
• The message data is stored in jsonPayload.message

For more information, see Structured Logging, specifically LogEntry.

Usage

import { LogLayer } from "loglayer";
import { GoogleCloudLoggingTransport } from "@loglayer/transport-google-cloud-logging";
import { Logging } from '@google-cloud/logging';
import { serializeError } from "serialize-error";

// Create the logging client
const logging = new Logging({ projectId: "GOOGLE_CLOUD_PLATFORM_PROJECT_ID" });
const log = logging.log('my-log');

// Create LogLayer instance with the transport
const logger = new LogLayer({
  errorSerializer: serializeError,
  transport: new GoogleCloudLoggingTransport({
    logger: log,
  })
});

// The logs will include the default metadata
logger.info("Hello from Cloud Run!");

Configuration Options

rootLevelData

The root level data to include for all log entries. This is not the same as using withContext(), which would be included as part of the jsonPayload.

The rootLevelData option accepts any valid Google Cloud LogEntry fields except for severity, timestamp, and jsonPayload which are managed by the transport.

const logger = new LogLayer({
  transport: new GoogleCloudLoggingTransport({
    logger: log,
    rootLevelData: {
      resource: {
        type: "cloud_run_revision",
        labels: {
          project_id: "my-project",
          service_name: "my-service",
          revision_name: "my-revision",
        },
      },
      labels: {
        environment: "production",
        version: "1.0.0",
      },
    },
  }),
});

Log Level Mapping

LogLayer log levels are mapped to Google Cloud Logging severity levels as follows:

| LogLayer Level | Google Cloud Logging Severity | |---------------|------------------------------| | fatal | CRITICAL | | error | ERROR | | warn | WARNING | | info | INFO | | debug | DEBUG | | trace | DEBUG |

Documentation

For more details, visit https://loglayer.dev/transports/google-cloud-logging