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Logging

Introduction

The JavaScript SDK comes with a out-of-box Console based logger. The SDK emits various internal logs to help users understand the chain of events and troubleshoot problems. A consumer of this SDK can customize the verbosity of the log, as well as provide their own implementation for the logger.

Configure log level

There are five levels of logging in descending order of importance - error, warn, info, verbose, and debug. Setting the log to a level means that the logger will emit all the logs that are at least as important as the mentioned level. For example, setting to verbose log means that the SDK will not emit debug level logs. The default log level is info.

Dapr Client

import { CommunicationProtocolEnum, DaprClient, LogLevel } from "@dapr/dapr";

// create a client instance with log level set to verbose.
const client = new DaprClient(daprHost, daprPort, CommunicationProtocolEnum.HTTP, {
  logger: { level: LogLevel.Verbose },
});

For more details on how to use the Client, see JavaScript Client.

DaprServer

import { CommunicationProtocolEnum, DaprServer, LogLevel } from "@dapr/dapr";

// create a server instance with log level set to error.
const server = new DaprServer(serverHost, serverPort, daprHost, daprPort, CommunicationProtocolEnum.HTTP, {
  logger: { level: LogLevel.Error },
});

For more details on how to use the Server, see JavaScript Server.

Custom LoggerService

The JavaScript SDK uses the in-built Console for logging. To use a custom logger like Winston or Pino, you can implement the LoggerService interface.

Winston based logging:

Create a new implementation of LoggerService.

import { LoggerService } from "@dapr/dapr";
import * as winston from "winston";

export class WinstonLoggerService implements LoggerService {
  private logger;

  constructor() {
    this.logger = winston.createLogger({
      transports: [new winston.transports.Console(), new winston.transports.File({ filename: "combined.log" })],
    });
  }

  error(message: any, ...optionalParams: any[]): void {
    this.logger.error(message, ...optionalParams);
  }
  warn(message: any, ...optionalParams: any[]): void {
    this.logger.warn(message, ...optionalParams);
  }
  info(message: any, ...optionalParams: any[]): void {
    this.logger.info(message, ...optionalParams);
  }
  verbose(message: any, ...optionalParams: any[]): void {
    this.logger.verbose(message, ...optionalParams);
  }
  debug(message: any, ...optionalParams: any[]): void {
    this.logger.debug(message, ...optionalParams);
  }
}

Pass the new implementation to the SDK.

import { CommunicationProtocolEnum, DaprClient, LogLevel } from "@dapr/dapr";
import { WinstonLoggerService } from "./WinstonLoggerService";

const winstonLoggerService = new WinstonLoggerService();

// create a client instance with log level set to verbose and logger service as winston.
const client = new DaprClient(daprHost, daprPort, CommunicationProtocolEnum.HTTP, {
  logger: { level: LogLevel.Verbose, service: winstonLoggerService },
});