gosiris is an actor framework for Golang.
Features
- Manage a hierarchy of actors (each actor has its own: state, behavior, mailbox, child actors)
- Deploy remote actors accessible though an AMQP broker or Kafka
- Automated registration and runtime discoverability using etcd registry
- Zipkin integration
- Built-in patterns (become/unbecome, send, forward, repeat, child supervision)
Examples
Hello world
package main
import (
"gosiris/gosiris"
)
func main() {
//Init a local actor system
gosiris.InitActorSystem(gosiris.SystemOptions{
ActorSystemName: "ActorSystem",
})
//Create an actor
parentActor := gosiris.Actor{}
//Close an actor
defer parentActor.Close()
//Create an actor
childActor := gosiris.Actor{}
//Close an actor
defer childActor.Close()
//Register a reaction to event types ("message" in this case)
childActor.React("message", func(context gosiris.Context) {
context.Self.LogInfo(context, "Received %v\n", context.Data)
})
//Register an actor to the system
gosiris.ActorSystem().RegisterActor("parentActor", &parentActor, nil)
//Register an actor by spawning it
gosiris.ActorSystem().SpawnActor(&parentActor, "childActor", &childActor, nil)
//Retrieve actor references
parentActorRef, _ := gosiris.ActorSystem().ActorOf("parentActor")
childActorRef, _ := gosiris.ActorSystem().ActorOf("childActor")
//Send a message from one actor to another (from parentActor to childActor)
childActorRef.Tell(gosiris.EmptyContext, "message", "Hi! How are you?", parentActorRef)
}
INFO: [childActor] 1988/01/08 01:00:00 Received Hi! How are you?
Distributed actor system example
In the following example, in less than 30 effective lines of code, we will see how to create a distributed actor system implementing a request/reply interaction. An actor will be triggered by AMQP messages while another one will be triggered by Kafka events. Each actor will register itself in an etcd instance and will discover the other actor at runtime. Last but not least, gosiris will also manage the Zipkin integration by automatically managing the spans and forwarding the logs.
package main
import (
"gosiris/gosiris"
"time"
)
func main() {
//Configure a distributed actor system with an etcd registry and a Zipkin integration
gosiris.InitActorSystem(gosiris.SystemOptions{
ActorSystemName: "ActorSystem",
RegistryUrl: "http://etcd:2379",
ZipkinOptions: gosiris.ZipkinOptions{
Url: "http://zipkin:9411/api/v1/spans",
Debug: true,
HostPort: "0.0.0.0",
SameSpan: true,
},
})
//Defer the actor system closure
defer gosiris.CloseActorSystem()
//Configure actor1
actor1 := new(gosiris.Actor).React("reply", func(context gosiris.Context) {
//Because Zipkin is enabled, the log will be also sent to the Zipkin server
context.Self.LogInfo(context, "Received: %v", context.Data)
})
//Defer actor1 closure
defer actor1.Close()
//Register a remote actor accessible through AMQP
gosiris.ActorSystem().RegisterActor("actor1", actor1, new(gosiris.ActorOptions).SetRemote(true).SetRemoteType(gosiris.Amqp).SetUrl("amqp://guest:guest@amqp:5672/").SetDestination("actor1"))
//Configure actor2
actor2 := new(gosiris.Actor).React("context", func(context gosiris.Context) {
//Because Zipkin is enabled, the log will be also sent to the Zipkin server
context.Self.LogInfo(context, "Received: %v", context.Data)
context.Sender.Tell(context, "reply", "hello back", context.Self)
})
//Defer actor2 closure
defer actor2.Close()
//Register a remote actor accessible through Kafka
gosiris.ActorSystem().SpawnActor(actor1, "actor2", actor2, new(gosiris.ActorOptions).SetRemote(true).SetRemoteType(gosiris.Kafka).SetUrl("kafka:9092").SetDestination("actor2"))
//Retrieve the actor references
actor1Ref, _ := gosiris.ActorSystem().ActorOf("actor1")
actor2Ref, _ := gosiris.ActorSystem().ActorOf("actor2")
//Send a message to the kafkaRef
actor2Ref.Tell(gosiris.EmptyContext, "context", "hello", actor1Ref)
time.Sleep(250 * time.Millisecond)
}
INFO: [actor2] 2017/11/11 00:38:24 Received: hello
INFO: [actor1] 2017/11/11 00:38:24 Received: hello back
More Examples
See the examples in actor_test.go.
Environment
First of all, to run the examples you must configure the following hostnames: etcd, amqp, zipkin, and kafka. Then to setup the full environment, you can simply run the Docker Compose.
Troubleshooting
You may experience errors during the tests like the following:
r.EncodeArrayStart undefined (type codec.encDriver has no field or method EncodeArrayStart)
This is a known issue with the etcd client used. The manual workaround (for the time being) is to delete manually the file keys.generated.go generated in /vendor.
Contributing
- Open an issue if you want a new feature or if you spotted a bug
- Feel free to propose pull requests
Any contribution is more than welcome! In the meantime, if we want to discuss gosiris you can contact me @teivah.