Hermod: Mythic, Mighty, Simple Message Broker

Hermod is a fast and simple gRPC based broker. It's a mini practical project to sail through the Golang and most common used tools and frameworks including:

• gRPC/Protobuf
• Concurrent programming
• Storing data using Cassandra/Postrgres/Redis
• Load Testing using K6 and simple golang client
• Unit Testing
• Monitoring using Prometheus and Grafana
• Tracing using Jaeger
• Rate Limiting using envoy
• Caching and batching for highly better performance
• Deploying using docker and kubernetes
• Creating helm chart for easy deployment

Structure

For better understanding the core and logical concept of Hermod, i've created a simple prezi presentation. You can find it here. Make sure to check it out!

RPCs Description

• Publish Requst

message PublishRequest {
  string subject = 1;
  bytes body = 2;
  int32 expirationSeconds = 3;
}

• Fetch Request

message FetchRequest {
  string subject = 1;
  int32 id = 2;
}

• Subscribe Request

message SubscribeRequest {
  string subject = 1;
}

• RPC Service

service Broker {
  rpc Publish (PublishRequest) returns (PublishResponse);
  rpc Subscribe(SubscribeRequest) returns (stream MessageResponse);
  rpc Fetch(FetchRequest) returns (MessageResponse);
}

Up and Running

Docker

docker-compose -f deployments/docker-compose.yml up

Kubernetes

cd hermod
helm install hermod