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configuration.md

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EEL Configuration

Most global configuration settings can be found in ../config-eel/config.json.

{
    "Name": "Default",
    "EventPort": 8080,
    "EventProxyPath": "/proxy",
    "EventProcPath": "/proc",
    "Endpoint": "http://localhost:9090",
    "MaxMessageSize": 51200,
    "MaxAttempts": 1,
    "InitialDelay": 125,
    "HttpTransactionHeader": "X-B3-TraceId",
    "HttpTimeout": 1000,
    "ResponseHeaderTimeout" : 5000,
    "MaxIdleConnsPerHost":100,
    "WorkerPoolSize": 1,
    "MessageQueueTimeout": 1000,
    "MessageQueueDepth": 100,
    "LogStats": "false"
    "DuplicateTimeout": 20000,
    "CustomProperties": {
        "key" : "value"
    },
}

Most of the settings are self-explanatory. In general, if a setting is blank or missing the feature it configures will be disabled.

  • Name - EEL deployment name. Primarily used for logging.
  • EventPort, EventProxyPath, EventProcPath - Endpoint where EEL is listening for incoming events. Default is http://localhost:8080/proxy for event forwarding and http://localhost:8080/proc for synchronous event processing.
  • Endpoint - Default endpoint for downstream service. Can be a flat string or an array of multiple endpoints. Can be overwritten by Endpoint in handler configuration.
  • MaxMessageSize - Maximum message size EEL will accept from upstream service.
  • MaxAttempts - If forwarding a message fails, this is the number of attempts EEL will retry with exponential backoff.
  • InitialDelay - Initial delay for exponential backoff algorithm.
  • HttpTransactionHeader - Zipkin compliant HTTP transaction ID header. The value for this header has to be configured in each handler separately.
  • WorkerPoolSize, MessageQueueTimeout, MessageQueueDepth - Worker pool settings for EEL event handling.
  • MaxIdleConnsPerHost, HttpTimeout, ResponseHeaderTimeout - Http settings for outgoing events.
  • LogStats - Boolean to turn stats logging (typically once a minute) on or off.
  • DuplicateTimeout - If > 0 will de-duplicated events with a TTL of DuplicateTimeout ms.
  • CustomProperties - Custom properties, can be accessed using the {{prop('key')}} function.

Plugins for consuming events from different event sources are configured in ../config-eel/plugins.json. By default EEL comes with a web hook plugin and a stdin plugin but it is easy to provide your own plugin for any other source of JSON events.

[
	{
		"Type" : "WEBHOOK",
		"Name" : "WEBHOOK",
		"Active" : true,
		"RestartOk": false,
		"Parameters" : {
		    "EventPort": 8080,
		    "EventProxyPath": "/v1/proxy",
		    "EventProcPath": "/v1/proc"
		}
	},
	{
		"Type" : "STDIN",
		"Name" : "STDIN",
		"Active" : false,
		"RestartOk": false,
		"Parameters" : {}
	}
]