gRPC-example

A scala akka proof of concept using gRPC and protocol buffers (protobuf).

For more information on protobuf, see https://developers.google.com/protocol-buffers. It's a protocol that has built in streaming as opposed to REST and SOAP.

Built using akka gRPC, see https://doc.akka.io/docs/akka-grpc/current/overview.html

To generate Certificates for Https: From gRPC-example/conf

On windows: New-SelfSignedCertificate -Subject "localhost" -TextExtension @("2.5.29.17={text}DNS=localhost&IPAddress=127.0.0.1&IPAddress=::1") -KeyExportPolicy Exportable

then

keytool -importcert -file keys.cer -keystore keys.jks -alias "localhost"

then visit the page in the browser and download the certificate from the page (this is the public cert, generated by play).

Convert the pem file to a .der

openssl x509 -outform der -in localhost.pem -out localhost.der

You then need to add this to your cacerts file (usually in ${JAVA_HOME}/jre/lib/security/cacerts), but if you use sdkman the below location works

keytool -import -file localhost.der -keystore ${JAVA_HOME}/lib/security/cacerts -alias "localhost"

GET /prime/:limit

This API returns a comma separated list of prime numbers up to and including the limit (if prime). Example request: GET /prime/17 Exampel response: 2,3,5,7,11,13,17