ElasticSearchLogger

Logger that dumps execution logs to ElasticSearch service.

Inherits: 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) 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 ElasticSearchLogger()

Instance methods

Close

Closes the component and frees used resources.

public Task CloseAsync(IContext context)

  • context: IContext - (optional) a context to trace execution through a call chain.

Configure

Closes the component and frees used resources.

public override void Configure(ConfigParams config)

  • config: ConfigParams - configuration parameters to be set.

IsOpen

Checks if the component is open.

public bool IsOpen()

  • returns: bool - true if the component is open and false otherwise.

Open

Opens the component.

public Task OpenAsync(IContext context)

  • context: IContext - (optional) a context to trace execution through a call chain.

Save

Saves log messages from the cache.

protected override void Save(List<LogMessage> messages)

  • messages: List<LogMessage> - list with log messages

SetReferences

Sets references to dependent components.

public override void SetReferences(IReferences references)

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

Write

Writes a log message to the logger destination.

protected override void Write(LogLevel level, IContext context, Exception error, string message)

  • level: LogLevel - log level.
  • context: IContext - (optional) a context to trace execution through a call chain.
  • error: Exception - error object associated with this message.
  • message: string - human-readable message to log.

Examples

var logger = new ElasticSearchLogger();
logger.Configure(ConfigParams.FromTuples(
    "connection.protocol", "http",
    "connection.host", "localhost",
    "connection.port", 9200 
));
logger.Open("123");

logger.Error("123", ex, "Error occured: %s", ex.message);
logger.Debug("123", "Everything is OK.");