Package com.linecorp.armeria.server.grpc

Class GrpcServiceBuilder

java.lang.Object

com.linecorp.armeria.server.grpc.GrpcServiceBuilder

public final class GrpcServiceBuilder
extends Object

Constructs a GrpcService to serve gRPC services from within Armeria.

Method Summary

Modifier and Type	Method	Description
GrpcServiceBuilder	addExceptionMapping(Class<? extends Throwable> exceptionType, Status status)	Adds the specified exception mapping that maps a Throwable to a gRPC Status.
<T extends Throwable> GrpcServiceBuilder	addExceptionMapping(Class<T> exceptionType, BiFunction<T,Metadata,Status> statusFunction)	Adds the specified exception mapping that maps a Throwable to a gRPC Status.
GrpcServiceBuilder	addService(BindableService bindableService)	Adds a gRPC BindableService to this GrpcServiceBuilder.
GrpcServiceBuilder	addService(ServerServiceDefinition service)	Adds a gRPC ServerServiceDefinition to this GrpcServiceBuilder, such as what's returned by BindableService.bindService().
GrpcServiceBuilder	addService(String path, BindableService bindableService)	Adds a gRPC BindableService to this GrpcServiceBuilder.
GrpcServiceBuilder	addService(String path, BindableService bindableService, MethodDescriptor<?,?> methodDescriptor)	Adds a method of gRPC BindableService to this GrpcServiceBuilder.
GrpcServiceBuilder	addService(String path, ServerServiceDefinition service)	Adds a gRPC ServerServiceDefinition to this GrpcServiceBuilder, such as what's returned by BindableService.bindService().
GrpcServiceBuilder	addService(String path, ServerServiceDefinition service, MethodDescriptor<?,?> methodDescriptor)	Adds a method of gRPC ServerServiceDefinition to this GrpcServiceBuilder.
GrpcServiceBuilder	addServiceDefinitions(ServerServiceDefinition... services)	Adds gRPC ServerServiceDefinitions to this GrpcServiceBuilder.
GrpcServiceBuilder	addServiceDefinitions(Iterable<ServerServiceDefinition> services)	Adds gRPC ServerServiceDefinitions to this GrpcServiceBuilder.
GrpcServiceBuilder	addServices(BindableService... bindableServices)	Adds gRPC BindableServices to this GrpcServiceBuilder.
GrpcServiceBuilder	addServices(Iterable<BindableService> bindableServices)	Adds gRPC BindableServices to this GrpcServiceBuilder.
GrpcService	build()	Constructs a new GrpcService that can be bound to ServerBuilder.
GrpcServiceBuilder	compressorRegistry(CompressorRegistry registry)	Sets the CompressorRegistry to use when compressing messages.
GrpcServiceBuilder	decompressorRegistry(DecompressorRegistry registry)	Sets the DecompressorRegistry to use when decompressing messages.
GrpcServiceBuilder	enableUnframedRequests(boolean enableUnframedRequests)	Sets whether the service handles requests not framed using the gRPC wire protocol.
GrpcServiceBuilder	exceptionMapping(GrpcStatusFunction statusFunction)	Sets the specified GrpcStatusFunction that maps a Throwable to a gRPC Status.
GrpcServiceBuilder	jsonMarshallerFactory(Function<? super ServiceDescriptor,? extends GrpcJsonMarshaller> jsonMarshallerFactory)	Sets the factory that creates a GrpcJsonMarshaller that serializes and deserializes request or response messages to and from JSON depending on the SerializationFormat.
GrpcServiceBuilder	setMaxInboundMessageSizeBytes(int maxInboundMessageSizeBytes)	Sets the maximum size in bytes of an individual incoming message.
GrpcServiceBuilder	setMaxOutboundMessageSizeBytes(int maxOutboundMessageSizeBytes)	Sets the maximum size in bytes of an individual outgoing message.
GrpcServiceBuilder	supportedSerializationFormats(SerializationFormat... formats)	Sets the SerializationFormats supported by this server.
GrpcServiceBuilder	supportedSerializationFormats(Iterable<SerializationFormat> formats)	Sets the SerializationFormats supported by this server.
GrpcServiceBuilder	unsafeWrapRequestBuffers(boolean unsafeWrapRequestBuffers)	Enables unsafe retention of request buffers.
GrpcServiceBuilder	useBlockingTaskExecutor(boolean useBlockingTaskExecutor)	Sets whether the service executes service methods using the blocking executor.
GrpcServiceBuilder	useClientTimeoutHeader(boolean useClientTimeoutHeader)	Sets whether to use a grpc-timeout header sent by the client to control the timeout for request processing.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

addService

public GrpcServiceBuilder addService(ServerServiceDefinition service)

Adds a gRPC ServerServiceDefinition to this GrpcServiceBuilder, such as what's returned by BindableService.bindService().

addService

public GrpcServiceBuilder addService(String path,
ServerServiceDefinition service)

Adds a gRPC ServerServiceDefinition to this GrpcServiceBuilder, such as what's returned by BindableService.bindService().

Note that the specified path replaces the normal gRPC service path. Let's say you have the following gRPC service definition.

 package example.grpc.hello;

 service HelloService {
   rpc Hello (HelloRequest) returns (HelloReply) {}
 }

The normal gRPC service path for the Hello method is "/example.grpc.hello.HelloService/Hello". However if you set "/foo" to path, the Hello method will be served at "/foo/Hello". This is useful for supporting unframed gRPC with HTTP idiomatic path.

addService

public GrpcServiceBuilder addService(String path,
ServerServiceDefinition service,
MethodDescriptor<?,?> methodDescriptor)

Adds a method of gRPC ServerServiceDefinition to this GrpcServiceBuilder. You can get MethodDescriptors from the enclosing class of your generated stub.

Note that the specified path replaces the normal gRPC service path. Let's say you have the following gRPC service definition.

 package example.grpc.hello;

 service HelloService {
   rpc Hello (HelloRequest) returns (HelloReply) {}
 }

The normal gRPC service path for the Hello method is "/example.grpc.hello.HelloService/Hello". However if you set "/foo" to path, the Hello method will be served at "/foo". This is useful for supporting unframed gRPC with HTTP idiomatic path.

addService

public GrpcServiceBuilder addService(BindableService bindableService)

Adds a gRPC BindableService to this GrpcServiceBuilder. Most gRPC service implementations are BindableServices.

addService

public GrpcServiceBuilder addService(String path,
BindableService bindableService)

Adds a gRPC BindableService to this GrpcServiceBuilder. Most gRPC service implementations are BindableServices.

Note that the specified path replaces the normal gRPC service path. Let's say you have the following gRPC service definition.

 package example.grpc.hello;

 service HelloService {
   rpc Hello (HelloRequest) returns (HelloReply) {}
 }

The normal gRPC service path for the Hello method is "/example.grpc.hello.HelloService/Hello". However if you set "/foo" to path, the Hello method will be served at "/foo/Hello". This is useful for supporting unframed gRPC with HTTP idiomatic path.

addService

public GrpcServiceBuilder addService(String path,
BindableService bindableService,
MethodDescriptor<?,?> methodDescriptor)

Adds a method of gRPC BindableService to this GrpcServiceBuilder. You can get MethodDescriptors from the enclosing class of your generated stub.

Note that the specified path replaces the normal gRPC service path. Let's say you have the following gRPC service definition.

 package example.grpc.hello;

 service HelloService {
   rpc Hello (HelloRequest) returns (HelloReply) {}
 }

The normal gRPC service path for the Hello method is "/example.grpc.hello.HelloService/Hello". However if you set "/foo" to path, the Hello method will be served at "/foo". This is useful for supporting unframed gRPC with HTTP idiomatic path.

addServices

public GrpcServiceBuilder addServices(BindableService... bindableServices)

Adds gRPC BindableServices to this GrpcServiceBuilder. Most gRPC service implementations are BindableServices.

addServices

public GrpcServiceBuilder addServices(Iterable<BindableService> bindableServices)

Adds gRPC BindableServices to this GrpcServiceBuilder. Most gRPC service implementations are BindableServices.

addServiceDefinitions

public GrpcServiceBuilder addServiceDefinitions(ServerServiceDefinition... services)

Adds gRPC ServerServiceDefinitions to this GrpcServiceBuilder.

addServiceDefinitions

public GrpcServiceBuilder addServiceDefinitions(Iterable<ServerServiceDefinition> services)

Adds gRPC ServerServiceDefinitions to this GrpcServiceBuilder.

decompressorRegistry

public GrpcServiceBuilder decompressorRegistry(DecompressorRegistry registry)

Sets the DecompressorRegistry to use when decompressing messages. If not set, will use the default, which supports gzip only.

compressorRegistry

public GrpcServiceBuilder compressorRegistry(CompressorRegistry registry)

Sets the CompressorRegistry to use when compressing messages. If not set, will use the default, which supports gzip only.

supportedSerializationFormats

public GrpcServiceBuilder supportedSerializationFormats(SerializationFormat... formats)

Sets the SerializationFormats supported by this server. If not set, defaults to support all GrpcSerializationFormats.values().

supportedSerializationFormats

public GrpcServiceBuilder supportedSerializationFormats(Iterable<SerializationFormat> formats)

Sets the SerializationFormats supported by this server. If not set, defaults to support all GrpcSerializationFormats.values().

setMaxInboundMessageSizeBytes

public GrpcServiceBuilder setMaxInboundMessageSizeBytes(int maxInboundMessageSizeBytes)

Sets the maximum size in bytes of an individual incoming message. If not set, will use VirtualHost.maxRequestLength(). To support long-running RPC streams, it is recommended to set ServerBuilder.maxRequestLength(long) (or VirtualHostBuilder.maxRequestLength(long)) and ServerBuilder.requestTimeoutMillis(long) (or VirtualHostBuilder.requestTimeoutMillis(long)) to very high values and set this to the expected limit of individual messages in the stream.

setMaxOutboundMessageSizeBytes

public GrpcServiceBuilder setMaxOutboundMessageSizeBytes(int maxOutboundMessageSizeBytes)

Sets the maximum size in bytes of an individual outgoing message. If not set, all messages will be sent. This can be a safety valve to prevent overflowing network connections with large messages due to business logic bugs.

enableUnframedRequests

public GrpcServiceBuilder enableUnframedRequests(boolean enableUnframedRequests)

Sets whether the service handles requests not framed using the gRPC wire protocol. Such requests should only have the serialized message as the request content, and the response content will only have the serialized response message. Supporting unframed requests can be useful, for example, when migrating an existing service to gRPC.

Limitations:

• Only unary methods (single request, single response) are supported.
• Message compression is not supported. EncodingService should be used instead for transport level encoding.

useBlockingTaskExecutor

public GrpcServiceBuilder useBlockingTaskExecutor(boolean useBlockingTaskExecutor)

Sets whether the service executes service methods using the blocking executor. By default, service methods are executed directly on the event loop for implementing fully asynchronous services. If your service uses blocking logic, you should either execute such logic in a separate thread using something like Executors.newCachedThreadPool() or enable this setting.

unsafeWrapRequestBuffers

public GrpcServiceBuilder unsafeWrapRequestBuffers(boolean unsafeWrapRequestBuffers)

Enables unsafe retention of request buffers. Can improve performance when working with very large (i.e., several megabytes) payloads.

DISCLAIMER: Do not use this if you don't know what you are doing. It is very easy to introduce memory leaks when using this method. You will probably spend much time debugging memory leaks during development if this is enabled. You will probably spend much time debugging memory leaks in production if this is enabled. You probably don't want to do this and should turn back now.

When enabled, the reference-counted buffer received from the client will be stored into RequestContext instead of being released. All ByteString in a protobuf message will reference sections of this buffer instead of having their own copies. When done with a request message, call GrpcUnsafeBufferUtil.releaseBuffer(Object, RequestContext) with the message and the request's context to release the buffer. The message must be the same reference as what was passed to the service stub - a message with the same contents will not work. If GrpcUnsafeBufferUtil.releaseBuffer(Object, RequestContext) is not called, the memory will be leaked.

Note that this isn't working if the payloads are compressed or the SerializationFormat is GrpcSerializationFormats.PROTO_WEB_TEXT.

jsonMarshallerFactory

public GrpcServiceBuilder jsonMarshallerFactory(Function<? super ServiceDescriptor,? extends GrpcJsonMarshaller> jsonMarshallerFactory)

Sets the factory that creates a GrpcJsonMarshaller that serializes and deserializes request or response messages to and from JSON depending on the SerializationFormat. The returned GrpcJsonMarshaller from the factory replaces the built-in GrpcJsonMarshaller.

This is commonly used to:

• Switch from the default of using lowerCamelCase for field names to using the field name from the proto definition, by setting MessageMarshaller.Builder.preservingProtoFieldNames(boolean) via GrpcJsonMarshallerBuilder.jsonMarshallerCustomizer(Consumer).

  
         GrpcService.builder()
                    .jsonMarshallerFactory(serviceDescriptor -> {
                        return GrpcJsonMarshaller.builder()
                                                 .jsonMarshallerCustomizer(builder -> {
                                                      builder.preservingProtoFieldNames(true);
                                                 })
                                                 .build(serviceDescriptor);
                    })
                    .build();
         

• Set a customer marshaller for non-Message types such as scalapb.GeneratedMessage for Scala and pbandk.Message for Kotlin.

useClientTimeoutHeader

public GrpcServiceBuilder useClientTimeoutHeader(boolean useClientTimeoutHeader)

Sets whether to use a grpc-timeout header sent by the client to control the timeout for request processing. If disabled, the request timeout will be the one configured for the Armeria server, e.g., using ServerBuilder.requestTimeout(Duration).

It is recommended to disable this when clients are not trusted code, e.g., for gRPC-Web clients that can come from arbitrary browsers.

exceptionMapping

public GrpcServiceBuilder exceptionMapping(GrpcStatusFunction statusFunction)

Sets the specified GrpcStatusFunction that maps a Throwable to a gRPC Status.

Note that this method and addExceptionMapping(Class, Status) are mutually exclusive.

addExceptionMapping

public GrpcServiceBuilder addExceptionMapping(Class<? extends Throwable> exceptionType,
Status status)

Adds the specified exception mapping that maps a Throwable to a gRPC Status. The mapping is used to handle a Throwable when it is raised.

Note that this method and exceptionMapping(GrpcStatusFunction) are mutually exclusive.

addExceptionMapping

public <T extends Throwable> GrpcServiceBuilder addExceptionMapping(Class<T> exceptionType,
BiFunction<T,Metadata,Status> statusFunction)

Adds the specified exception mapping that maps a Throwable to a gRPC Status. The mapping is used to handle a Throwable when it is raised.

Note that this method and exceptionMapping(GrpcStatusFunction) are mutually exclusive.

build

public GrpcService build()

Constructs a new GrpcService that can be bound to ServerBuilder. It is recommended to bind the service to a server using ServerBuilder.service(HttpServiceWithRoutes) to mount all service paths without interfering with other services.