Splunk

Since Camel 2.13

Both producer and consumer are supported

The Splunk component provides access to Splunk using the Splunk provided client api, and it enables you to publish and search for events in Splunk.

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-splunk</artifactId>
    <version>${camel-version}</version>
</dependency>

URI format

splunk://[endpoint]?[options]

Configuring Options

Camel components are configured on two separate levels:

  • component level

  • endpoint level

Configuring Component Options

The component level is the highest level which holds general and common configurations that are inherited by the endpoints. For example a component may have security settings, credentials for authentication, urls for network connection and so forth.

Some components only have a few options, and others may have many. Because components typically have pre configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

Configuring components can be done with the Component DSL, in a configuration file (application.properties|yaml), or directly with Java code.

Configuring Endpoint Options

Where you find yourself configuring the most is on endpoints, as endpoints often have many options, which allows you to configure what you need the endpoint to do. The options are also categorized into whether the endpoint is used as consumer (from) or as a producer (to), or used for both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL as a type safe way of configuring endpoints.

A good practice when configuring options is to use Property Placeholders, which allows to not hardcode urls, port numbers, sensitive information, and other settings. In other words placeholders allows to externalize the configuration from your code, and gives more flexibility and reuse.

The following two sections lists all the options, firstly for the component followed by the endpoint.

Component Options

The Splunk component supports 4 options, which are listed below.

Name Description Default Type

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

boolean

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

boolean

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

boolean

splunkConfigurationFactory (advanced)

To use the SplunkConfigurationFactory.

SplunkConfigurationFactory

Endpoint Options

The Splunk endpoint is configured using URI syntax:

splunk:name

with the following path and query parameters:

Path Parameters (1 parameters)

Name Description Default Type

name (common)

Required Name has no purpose.

String

Query Parameters (44 parameters)

Name Description Default Type

app (common)

Splunk app.

String

connectionTimeout (common)

Timeout in MS when connecting to Splunk server.

int

host (common)

Splunk host.

String

owner (common)

Splunk owner.

String

port (common)

Splunk port.

int

scheme (common)

Splunk scheme.

String

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

boolean

count (consumer)

A number that indicates the maximum number of entities to return.

int

earliestTime (consumer)

Earliest time of the search time window.

String

initEarliestTime (consumer)

Initial start offset of the first search.

String

latestTime (consumer)

Latest time of the search time window.

String

savedSearch (consumer)

The name of the query saved in Splunk to run.

String

The Splunk query to run.

String

sendEmptyMessageWhenIdle (consumer)

If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead.

boolean

streaming (consumer)

Sets streaming mode. Streaming mode sends exchanges as they are received, rather than in a batch.

boolean

exceptionHandler (consumer (advanced))

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

ExceptionHandler

exchangePattern (consumer (advanced))

Sets the exchange pattern when the consumer creates an exchange.

Enum values:

  • InOnly

  • InOut

  • InOptionalOut

ExchangePattern

pollStrategy (consumer (advanced))

A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel.

PollingConsumerPollStrategy

eventHost (producer)

Override the default Splunk event host field.

String

index (producer)

Splunk index to write to.

String

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

boolean

raw (producer)

Should the payload be inserted raw.

boolean

source (producer)

Splunk source argument.

String

sourceType (producer)

Splunk sourcetype argument.

String

tcpReceiverLocalPort (producer)

Splunk tcp receiver port defined locally on splunk server. (For example if splunk port 9997 is mapped to 12345, tcpReceiverLocalPort has to be 9997).

Integer

tcpReceiverPort (producer)

Splunk tcp receiver port.

int

backoffErrorThreshold (scheduler)

The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in.

int

backoffIdleThreshold (scheduler)

The number of subsequent idle polls that should happen before the backoffMultipler should kick-in.

int

backoffMultiplier (scheduler)

To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the next actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured.

int

delay (scheduler)

Milliseconds before the next poll.

long

greedy (scheduler)

If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the previous run polled 1 or more messages.

boolean

initialDelay (scheduler)

Milliseconds before the first poll starts.

long

repeatCount (scheduler)

Specifies a maximum limit of number of fires. So if you set it to 1, the scheduler will only fire once. If you set it to 5, it will only fire five times. A value of zero or negative means fire forever.

long

runLoggingLevel (scheduler)

The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that.

Enum values:

  • TRACE

  • DEBUG

  • INFO

  • WARN

  • ERROR

  • OFF

LoggingLevel

scheduledExecutorService (scheduler)

Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool.

ScheduledExecutorService

scheduler (scheduler)

To use a cron scheduler from either camel-spring or camel-quartz component. Use value spring or quartz for built in scheduler.

Object

schedulerProperties (scheduler)

To configure additional properties when using a custom scheduler or any of the Quartz, Spring based scheduler.

Map

startScheduler (scheduler)

Whether the scheduler should be auto started.

boolean

timeUnit (scheduler)

Time unit for initialDelay and delay options.

Enum values:

  • NANOSECONDS

  • MICROSECONDS

  • MILLISECONDS

  • SECONDS

  • MINUTES

  • HOURS

  • DAYS

TimeUnit

useFixedDelay (scheduler)

Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details.

boolean

password (security)

Password for Splunk.

String

sslProtocol (security)

Set the ssl protocol to use.

Enum values:

  • TLSv1.2

  • TLSv1.1

  • TLSv1

  • SSLv3

SSLSecurityProtocol

username (security)

Username for Splunk.

String

useSunHttpsHandler (security)

Use sun.net.www.protocol.https.Handler Https handler to establish the Splunk Connection. Can be useful when running in application servers to avoid app. server https handling.

boolean

Producer Endpoints:

Endpoint Description

stream

Streams data to a named index or the default if not specified. When using stream mode be aware of that Splunk has some internal buffer (about 1MB or so) before events gets to the index. If you need realtime, better use submit or tcp mode.

submit

submit mode. Uses Splunk rest api to publish events to a named index or the default if not specified.

tcp

tcp mode. Streams data to a tcp port, and requires a open receiver port in Splunk.

When publishing events the message body should contain a SplunkEvent. See comment under message body.

Example

      from("direct:start").convertBodyTo(SplunkEvent.class)
          .to("splunk://submit?username=user&password=123&index=myindex&sourceType=someSourceType&source=mySource")...

In this example a converter is required to convert to a SplunkEvent class.

Consumer Endpoints:

Endpoint Description

normal

Performs normal search and requires a search query in the search option.

savedsearch

Performs search based on a search query saved in splunk and requires the name of the query in the savedSearch option.

Example

      from("splunk://normal?delay=5000&username=user&password=123&initEarliestTime=-10s&search=search index=myindex sourcetype=someSourcetype")
          .to("direct:search-result");

camel-splunk creates a route exchange per search result with a SplunkEvent in the body.

Message body

Splunk operates on data in key/value pairs. The SplunkEvent class is a placeholder for such data, and should be in the message body for the producer. Likewise it will be returned in the body per search result for the consumer.

You can send raw data to Splunk by setting the raw option on the producer endpoint. This is useful for eg. json/xml and other payloads where Splunk has build in support.

Use Cases

Search Twitter for tweets with music and publish events to Splunk

      from("twitter://search?type=polling&keywords=music&delay=10&consumerKey=abc&consumerSecret=def&accessToken=hij&accessTokenSecret=xxx")
          .convertBodyTo(SplunkEvent.class)
          .to("splunk://submit?username=foo&password=bar&index=camel-tweets&sourceType=twitter&source=music-tweets");

To convert a Tweet to a SplunkEvent you could use a converter like

@Converter
public class Tweet2SplunkEvent {
    @Converter
    public static SplunkEvent convertTweet(Status status) {
        SplunkEvent data = new SplunkEvent("twitter-message", null);
        //data.addPair("source", status.getSource());
        data.addPair("from_user", status.getUser().getScreenName());
        data.addPair("in_reply_to", status.getInReplyToScreenName());
        data.addPair(SplunkEvent.COMMON_START_TIME, status.getCreatedAt());
        data.addPair(SplunkEvent.COMMON_EVENT_ID, status.getId());
        data.addPair("text", status.getText());
        data.addPair("retweet_count", status.getRetweetCount());
        if (status.getPlace() != null) {
            data.addPair("place_country", status.getPlace().getCountry());
            data.addPair("place_name", status.getPlace().getName());
            data.addPair("place_street", status.getPlace().getStreetAddress());
        }
        if (status.getGeoLocation() != null) {
            data.addPair("geo_latitude", status.getGeoLocation().getLatitude());
            data.addPair("geo_longitude", status.getGeoLocation().getLongitude());
        }
        return data;
    }
}

Search Splunk for tweets

      from("splunk://normal?username=foo&password=bar&initEarliestTime=-2m&search=search index=camel-tweets sourcetype=twitter")
          .log("${body}");

Other comments

Splunk comes with a variety of options for leveraging machine generated data with prebuilt apps for analyzing and displaying this.
For example the jmx app. could be used to publish jmx attributes, eg. route and jvm metrics to Splunk, and displaying this on a dashboard.

Spring Boot Auto-Configuration

When using splunk with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-splunk-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 5 options, which are listed below.

Name Description Default Type

camel.component.splunk.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.splunk.bridge-error-handler

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

Boolean

camel.component.splunk.enabled

Whether to enable auto configuration of the splunk component. This is enabled by default.

Boolean

camel.component.splunk.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean

camel.component.splunk.splunk-configuration-factory

To use the SplunkConfigurationFactory. The option is a org.apache.camel.component.splunk.SplunkConfigurationFactory type.

SplunkConfigurationFactory