2016 gRPC SF Meetup - Applied Context, Metadata, Propagation - Auth, Trace, Monitoring

A talk on gRPC advanced features such as Context, Metadata and how to propagate metadata information across service calls.

Once we understand how it works, we can apply it to authentication, tracing, and performance monitoring, etc.

Transcript

1. @saturnism @googlecloud @grpcio gRPC Microservices 201 for Java Developers Ray Tsang (@saturnism), Google Cloud Platform
2. @saturnism @googlecloud @grpcio Ray Tsang Developer Advocate Google Cloud Platform @saturnism | +RayTsang
3. @saturnism @googlecloud @grpcio BigQuery Big Data Pub/Sub Dataflow Dataproc Datalab Compute Compute Engine App Engine Container Engine Storage Cloud Storage Cloud SQL Cloud Datastore Bigtable Machine Learning Speech API Machine Learning Translate API Vision API cloud.google.com
4. @saturnism @googlecloud @grpcio A B C D gRPC
5. @saturnism @googlecloud @grpcio Microservices Concerns Concern What you can use, e.g. Load Balancing https://github.com/grpc/grpc/blob/master/doc/load-balancing.md Server-side: Lyft Envoy, NGinx, or Client-side: With Central Registry Service Registry (Client Side LB) Consul, Zookeper, Eureka, gRPC LB Health Checking https://github.com/grpc/grpc/blob/master/doc/health-checking.md gRPC Health Check Protocol Or, Expose endpoints Security TLS, Token headers Authorization Token headers Distributed Tracing Zipkin Monitoring Prometheus
6. @saturnism @googlecloud @grpcio Microservices Concerns Concern What you can use, e.g. Load Balancing https://github.com/grpc/grpc/blob/master/doc/load-balancing.md Server-side: Lyft Envoy, NGinx, or Client-side: With Central Registry Service Registry (Client Side LB) Consul, Zookeeper, Eureka, gRPC LB Health Checking https://github.com/grpc/grpc/blob/master/doc/health-checking.md gRPC Health Check Protocol Or, Expose endpoints Security TLS, Token headers Authorization Tokens, JWT, OAuth Distributed Tracing Zipkin Monitoring Prometheus
7. @saturnism @googlecloud @grpcio It was pretty easy w/ HTTP/1 Used HTTP Headers What do we do in gRPC?!
8. @saturnism @googlecloud @grpcio Header Greeting Service Client greeting(HelloRequest) POST /…./GreetingService Client-ID: GreetingClientV1 … [HelloRequest payload] Client-ID: GreetingClientV1
9. @saturnism @googlecloud @grpcio Metadata! Greeting Service Client greeting(HelloRequest) Type-safe construct for attaching Header/Trailer to the requests Metadata metadata = new Metadata(); metadat.put(key, value); stub = MetadataUtils.attach(stub, metadata); stub.greeting(request); Client-ID: GreetingClientV1 Metadata: { Client-ID: GreetingClientV1 }
10. @saturnism @googlecloud @grpcio Getting the Metadata Greeting Service Client greeting(HelloRequest) On the server side, intercept the call to get the metadata. Client-ID: GreetingClientV1 Metadata: { Client-ID: GreetingClientV1 } Metadata: { Client-ID: GreetingClientV1 }
11. @saturnism @googlecloud @grpcio How to access? Context! Greeting Service Client greeting(HelloRequest) Client-ID: GreetingClientV1 Metadata: { Client-ID: GreetingClientV1 } Metadata: { Client-ID: GreetingClientV1 } Context Client-ID: GreetingClientV1
12. @saturnism @googlecloud @grpcio So what is Context again? Carries scoped values across API call / threads in the same process But NOT across the wire!
13. @saturnism @googlecloud @grpcio Propagate - MD → Ctx → MD Greeting Service Client Context Client-ID: GreetingClientV1 Client 2 Metadata: { Client-ID: GreetingClientV1 } Translation Service Client-ID: GreetingClientV1
14. @saturnism @googlecloud @grpcio Use Client Interceptor Greeting Service Client Context Client-ID: GreetingClientV1 Client 2 Metadata: { Client-ID: GreetingClientV1 } Translation Service Client-ID: GreetingClientV1
15. @saturnism @googlecloud @grpcio Answer to everything Metadata → Context → Metadata Auth Token Deadline Distributed Trace ID
16. 16 Let's see it...
17. 17 grpc is Open Source We want your help! http://grpc.io/contribute https://github.com/grpc irc.freenode.net #grpc @grpcio grpc-io@googlegroups.com
18. Google Cloud Platform 18 @saturnism @googlecloud @grpcio https://github.com/saturnism/grpc-java-demos Thanks!