Overview

gRPC

gRPC is a transport mechanism for request/response and (non-persistent) streaming use cases. See Why gRPC? for more information about when to use gRPC as your transport.

gRPC APIs are useful instead of (or as a complement to) JSON/REST-based API.

Pekko gRPC

Pekko gRPC provides support for building streaming gRPC servers and clients on top of Pekko Streams and Pekko HTTP.

It features:

• A generator, that starts from a protobuf service definitions, for:
  • Model classes
  • The service API as a Scala traitJava interface using Pekko Stream Sources
  • On the server side, code to create a Pekko HTTP route based on your implementation of the service
  • On the client side side, a client for the service
• gRPC Runtime implementation that uses
  • Pekko HTTP/2 support for the server side and
  • grpc-netty-shaded for the client side.
• Support for sbt, gradle, Maven, and the Play Framework.

Project Information

Project Info: Apache Pekko gRPC
Artifact	org.apache.pekko pekko-grpc-runtime 1.2.0 Snapshots are available from Apache Snapshots Repository
JDK versions	OpenJDK 8 OpenJDK 11 OpenJDK 17 OpenJDK 21
Scala versions	2.12.20, 2.13.16, 3.3.6
JPMS module name	pekko.grpc.runtime
License	Apache-2.0
Home page	https://pekko.apache.org/
API documentation	API (Scaladoc)
Forums	Apache Pekko User mailing list Apache Pekko Dev mailing list Github Discussions
Release notes	GitHub releases
Issues	GitHub issues
Sources	https://github.com/apache/pekko-grpc

Project Status

Pekko gRPC is still under development.

Both client- and server-side APIs are based on Pekko Streams.

The client side is currently implemented on top of io.grpc:grpc-netty-shaded.

Later versions may replace this by io.grpc:grpc-core and Pekko HTTP, when Pekko HTTP offers HTTP/2 client support.