136 lines
4.1 KiB
Markdown
136 lines
4.1 KiB
Markdown
# Go Micro [](https://godoc.org/github.com/myodc/go-micro) [](https://travis-ci.org/myodc/go-micro)
|
|
|
|
Go Micro is a microservices library which provides the fundamental building blocks for writing fault tolerant distributed systems at scale. It is part of the [Micro](https://github.com/myodc/micro) toolchain.
|
|
|
|
An example server can be found in examples/server.
|
|
|
|
- [Mailing List](https://groups.google.com/forum/#!forum/micro-services)
|
|
- [Slack](https://micro-services.slack.com) : [auto-invite](http://micro-invites.herokuapp.com/)
|
|
|
|
## Features
|
|
|
|
Feature | Package | Description
|
|
------- | ------- | ---------
|
|
Discovery | [Registry](https://godoc.org/github.com/myodc/go-micro/registry) | A way of locating services to communicate with
|
|
Client | [Client](https://godoc.org/github.com/myodc/go-micro/client) | Used to make RPC requests to a service
|
|
Server | [Server](https://godoc.org/github.com/myodc/go-micro/server) | Listens and serves RPC requests
|
|
Pub/Sub | [Broker](https://godoc.org/github.com/myodc/go-micro/broker) | Publish and Subscribe to events
|
|
|
|
## Prerequisites
|
|
|
|
Consul is the default discovery mechanism provided in go-micro. Discovery is however pluggable.
|
|
|
|
### Install Consul
|
|
[https://www.consul.io/intro/getting-started/install.html](https://www.consul.io/intro/getting-started/install.html)
|
|
|
|
## Getting Started
|
|
|
|
### Run Consul
|
|
```
|
|
$ consul agent -server -bootstrap-expect 1 -data-dir /tmp/consul
|
|
```
|
|
|
|
### Run Service
|
|
```
|
|
$ go run examples/server/main.go --logtostderr
|
|
I1108 11:08:19.926071 11358 server.go:96] Starting server go.micro.srv.example id go.micro.srv.example-04de4cf0-8609-11e5-bf3a-68a86d0d36b6
|
|
I1108 11:08:19.926407 11358 rpc_server.go:233] Listening on [::]:54080
|
|
I1108 11:08:19.926500 11358 http_broker.go:80] Broker Listening on [::]:54081
|
|
I1108 11:08:19.926632 11358 rpc_server.go:158] Registering node: go.micro.srv.example-04de4cf0-8609-11e5-bf3a-68a86d0d36b6
|
|
```
|
|
|
|
### Test Service
|
|
```
|
|
$ go run examples/client/main.go
|
|
go.micro.srv.example-59b6e0ab-0300-11e5-b696-68a86d0d36b6: Hello John
|
|
```
|
|
|
|
## Writing a service
|
|
|
|
### Create request/response proto
|
|
`go-micro/examples/server/proto/example/example.proto`:
|
|
|
|
```
|
|
syntax = "proto3";
|
|
|
|
message Request {
|
|
string name = 1;
|
|
}
|
|
|
|
message Response {
|
|
string msg = 1;
|
|
}
|
|
```
|
|
|
|
Compile proto `protoc -I$GOPATH/src --go_out=$GOPATH/src $GOPATH/src/github.com/myodc/go-micro/examples/server/proto/example/example.proto`
|
|
|
|
### Create request handler
|
|
`go-micro/examples/server/handler/example.go`:
|
|
|
|
```go
|
|
package handler
|
|
|
|
import (
|
|
log "github.com/golang/glog"
|
|
c "github.com/myodc/go-micro/context"
|
|
example "github.com/myodc/go-micro/examples/server/proto/example"
|
|
"github.com/myodc/go-micro/server"
|
|
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
type Example struct{}
|
|
|
|
func (e *Example) Call(ctx context.Context, req *example.Request, rsp *example.Response) error {
|
|
md, _ := c.GetMetadata(ctx)
|
|
log.Infof("Received Example.Call request with metadata: %v", md)
|
|
rsp.Msg = server.Config().Id() + ": Hello " + req.Name
|
|
return nil
|
|
}
|
|
```
|
|
|
|
### Init server
|
|
`go-micro/examples/server/main.go`:
|
|
|
|
```go
|
|
package main
|
|
|
|
import (
|
|
log "github.com/golang/glog"
|
|
"github.com/myodc/go-micro/cmd"
|
|
"github.com/myodc/go-micro/examples/server/handler"
|
|
"github.com/myodc/go-micro/server"
|
|
)
|
|
|
|
func main() {
|
|
// optionally setup command line usage
|
|
cmd.Init()
|
|
|
|
// Initialise Server
|
|
server.Init(
|
|
server.Name("go.micro.srv.example"),
|
|
)
|
|
|
|
// Register Handlers
|
|
server.Handle(
|
|
server.NewHandler(
|
|
new(handler.Example),
|
|
),
|
|
)
|
|
|
|
// Run server
|
|
if err := server.Run(); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|
|
```
|
|
|
|
### Run service
|
|
```
|
|
$ go run examples/server/main.go --logtostderr
|
|
I1108 11:08:19.926071 11358 server.go:96] Starting server go.micro.srv.example id go.micro.srv.example-04de4cf0-8609-11e5-bf3a-68a86d0d36b6
|
|
I1108 11:08:19.926407 11358 rpc_server.go:233] Listening on [::]:54080
|
|
I1108 11:08:19.926500 11358 http_broker.go:80] Broker Listening on [::]:54081
|
|
I1108 11:08:19.926632 11358 rpc_server.go:158] Registering node: go.micro.srv.example-04de4cf0-8609-11e5-bf3a-68a86d0d36b6
|
|
```
|