ElasticSearchLogger

Logger that dumps execution logs to ElasticSearch service.

Implements: CachedLogger, IReferenceable, IOpenable

Description

The ElasticSearchLogger class allows you to create loggers that dump execution logs to an ElasticSearch service.

Important points

  • Elasticsearch is a popular search index. It is often used to store and index execution logs by itself or as a part of ELK (ElasticSearch - Logstash - Kibana) stack.
  • Authentication is not supported in this version.

Configuration parameters

  • level: maximum log level to capture
  • source: source (context) name

connection(s):

  • discovery_key: (optional) a key to retrieve the connection from IDiscovery
  • protocol: connection protocol: http or https
  • host: host name or IP address
  • port: port number
  • uri: resource URI or connection string with all parameters in it

options:

  • interval: interval in milliseconds to save log messages (default: 10 seconds)
  • max_cache_size: maximum number of messages stored in this cache (default: 100)
  • index: ElasticSearch index name (default: “log”)
  • date_format: date format used to create the index name. Eg. log-YYYYMMDD (default: “YYYYMMDD”).
  • daily: True to create a new index every day by adding a date suffix to the index name (default: False)
  • reconnect: reconnect timeout in milliseconds (default: 60 sec)
  • timeout: invocation timeout in milliseconds (default: 30 sec)
  • max_retries: maximum number of retries (default: 3)
  • index_message: True to enable indexing for message object (default: False)
  • include_type_name: will create using a “typed” index compatible with ElasticSearch 6.x (default: false)

References

  • *:discovery:*:*:1.0 - (optional) IDiscovery services
  • *:context-info:*:*:1.0 - (optional) ContextInfo to detect the context id and specify the counter’s source.

Constructors

Creates a new instance of the logger.

public constructor()

Instance methods

close

Closes the component and frees used resources.

public close(correlationId: string): Promise<void>

  • correlationId: string - (optional) transaction id used to trace execution through the call chain.

configure

Closes the component and frees used resources.

public configure(config: ConfigParams): void

  • config: ConfigParams - configuration parameters to be set.

isOpen

Checks if the component is open.

public isOpen(): boolean

  • returns: boolean - True if the component is open and False otherwise.

open

Opens the component.

public open(correlationId: string): Promise<void>

  • correlationId: string - (optional) transaction id used to trace execution through the call chain.

_save

Saves log messages from the cache.

protected save(messages: LogMessage[]): Promise<void>

setReferences

Sets references to dependent components.

setReferences(references: IReferences): void

  • messages: IReferences - references to locate the component dependencies.

Examples

let logger = new ElasticSearchLogger();
logger.configure(ConfigParams.fromTuples(
    "connection.protocol", "http",
    "connection.host", "localhost",
    "connection.port", 9200
));
    
await logger.open("123");
    
logger.error("123", ex, "Error occured: %s", ex.message);
logger.debug("123", "Everything is OK.");