gRPC

Expose gRPC endpoints and access external gRPC endpoints.

Metadata

Property	Value
Scheme	`grpc`
Support Level	Stable
Labels	rpc
Version	4.10.2

Maven Dependency

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-grpc</artifactId>
    <version>4.10.2</version>
</dependency>

Endpoint Properties

Name	Type	Required	Default	Description
`host`	string	✓		The gRPC server host name. This is localhost or 0.0.0.0 when being a consumer or remote server host name when using producer.
`port`	integer	✓		The gRPC local or remote server port
`service`	string	✓		Fully qualified service name from the protocol buffer descriptor file (package dot service definition name)
`flowControlWindow`	integer		`1048576`	The HTTP/2 flow control window size (MiB)
`maxMessageSize`	integer		`4194304`	The maximum message size allowed to be received/sent (MiB)
`autoDiscoverServerInterceptors`	boolean		`true`	Setting the autoDiscoverServerInterceptors mechanism, if true, the component will look for a ServerInterceptor instance in the registry automatically otherwise it will skip that checking.
`consumerStrategy`	object		`PROPAGATION`	This option specifies the top-level strategy for processing service requests and responses in streaming mode. If an aggregation strategy is selected, all requests will be accumulated in the list, then transferred to the flow, and the accumulated responses will be sent to the sender. If a propagation strategy is selected, request is sent to the stream, and the response will be immediately sent back to the sender. If a delegation strategy is selected, request is sent to the stream, but no response generated under the assumption that all necessary responses will be sent at another part of route. Delegation strategy always comes with routeControlledStreamObserver=true to be able to achieve the assumption.
`forwardOnCompleted`	boolean		`false`	Determines if onCompleted events should be pushed to the Camel route.
`forwardOnError`	boolean		`false`	Determines if onError events should be pushed to the Camel route. Exceptions will be set as message body.
`initialFlowControlWindow`	integer		`1048576`	Sets the initial flow control window in bytes.
`keepAliveTime`	integer		`7200000`	Sets a custom keepalive time in milliseconds, the delay time for sending next keepalive ping. A value of Long.MAX_VALUE or a value greater or equal to NettyServerBuilder.AS_LARGE_AS_INFINITE will disable keepalive.
`keepAliveTimeout`	integer		`20000`	Sets a custom keepalive timeout in milliseconds, the timeout for keepalive ping requests.
`maxConcurrentCallsPerConnection`	integer		`2147483647`	The maximum number of concurrent calls permitted for each incoming server connection. Defaults to no limit.
`maxConnectionAge`	integer		`9223372036854776000`	Sets a custom max connection age in milliseconds. Connections lasting longer than which will be gracefully terminated. A random jitter of /-10% will be added to the value. A value of Long.MAX_VALUE (the default) or a value greater or equal to NettyServerBuilder.AS_LARGE_AS_INFINITE will disable max connection age.
`maxConnectionAgeGrace`	integer		`9223372036854776000`	Sets a custom grace time in milliseconds for the graceful connection termination. A value of Long.MAX_VALUE (the default) or a value greater or equal to NettyServerBuilder.AS_LARGE_AS_INFINITE is considered infinite.
`maxConnectionIdle`	integer		`9223372036854776000`	Sets a custom max connection idle time in milliseconds. Connection being idle for longer than which will be gracefully terminated. A value of Long.MAX_VALUE (the default) or a value greater or equal to NettyServerBuilder.AS_LARGE_AS_INFINITE will disable max connection idle
`maxInboundMetadataSize`	integer		`8192`	Sets the maximum size of metadata allowed to be received. The default is 8 KiB.
`maxRstFramesPerWindow`	integer		`0`	Limits the rate of incoming RST_STREAM frames per connection to maxRstFramesPerWindow per maxRstPeriodSeconds. This option MUST be used in conjunction with maxRstPeriodSeconds for it to be effective.
`maxRstPeriodSeconds`	integer		`0`	Limits the rate of incoming RST_STREAM frames per maxRstPeriodSeconds. This option MUST be used in conjunction with maxRstFramesPerWindow for it to be effective.
`permitKeepAliveTime`	integer		`300000`	Sets the most aggressive keep-alive time in milliseconds that clients are permitted to configure. The server will try to detect clients exceeding this rate and will forcefully close the connection.
`permitKeepAliveWithoutCalls`	boolean		`false`	Sets whether to allow clients to send keep-alive HTTP/ 2 PINGs even if there are no outstanding RPCs on the connection.
`routeControlledStreamObserver`	boolean		`false`	Lets the route to take control over stream observer. If this value is set to true, then the response observer of gRPC call will be set with the name GrpcConstants.GRPC_RESPONSE_OBSERVER in the Exchange object. Please note that the stream observer's onNext(), onError(), onCompleted() methods should be called in the route.
`bridgeErrorHandler`	boolean		`false`	Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. 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.
`exceptionHandler`	object			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.
`exchangePattern`	object			Sets the exchange pattern when the consumer creates an exchange.
`autoDiscoverClientInterceptors`	boolean		`true`	Setting the autoDiscoverClientInterceptors mechanism, if true, the component will look for a ClientInterceptor instance in the registry automatically otherwise it will skip that checking.
`inheritExchangePropertiesForReplies`	boolean		`false`	Copies exchange properties from original exchange to all exchanges created for route defined by streamRepliesTo.
`method`	string			gRPC method name
`producerStrategy`	object		`SIMPLE`	The mode used to communicate with a remote gRPC server. In SIMPLE mode a single exchange is translated into a remote procedure call. In STREAMING mode all exchanges will be sent within the same request (input and output of the recipient gRPC service must be of type 'stream').
`streamRepliesTo`	string			When using STREAMING client mode, it indicates the endpoint where responses should be forwarded.
`toRouteControlledStreamObserver`	boolean		`false`	Expects that exchange property GrpcConstants.GRPC_RESPONSE_OBSERVER is set. Takes its value and calls onNext, onError and onComplete on that StreamObserver. All other gRPC parameters are ignored.
`userAgent`	string			The user agent header passed to the server
`lazyStartProducer`	boolean		`false`	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.
`synchronous`	boolean		`false`	Sets whether synchronous processing should be strictly used
`authenticationType`	object		`NONE`	Authentication method type in advance to the SSL/TLS negotiation
`jwtAlgorithm`	object		`HMAC256`	JSON Web Token sign algorithm
`jwtIssuer`	string			JSON Web Token issuer
`jwtSecret`	string			JSON Web Token secret
`jwtSubject`	string			JSON Web Token subject
`keyCertChainResource`	string			The X.509 certificate chain file resource in PEM format link
`keyPassword`	string			The PKCS#8 private key file password
`keyResource`	string			The PKCS#8 private key file resource in PEM format link
`negotiationType`	object		`PLAINTEXT`	Identifies the security negotiation type used for HTTP/2 communication
`serviceAccountResource`	string			Service Account key file in JSON format resource link supported by the Google Cloud SDK
`trustCertCollectionResource`	string			The trusted certificates collection file resource in PEM format for verifying the remote endpoint's certificate