128 lines
3.3 KiB
Markdown
128 lines
3.3 KiB
Markdown
# Go Micro [](https://godoc.org/github.com/myodc/go-micro) [](https://travis-ci.org/myodc/go-micro)
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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.
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An example server can be found in examples/server.
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## Features
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- Discovery
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- Client
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- Server
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- Pub/Sub
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## Prerequisites
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Consul is the default discovery mechanism provided in go-micro. Discovery is however pluggable.
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### Install Consul
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[https://www.consul.io/intro/getting-started/install.html](https://www.consul.io/intro/getting-started/install.html)
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## Getting Started
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### Run Consul
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```
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$ consul agent -server -bootstrap-expect 1 -data-dir /tmp/consul
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```
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### Run Service
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```
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$ go run examples/server/main.go
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I0525 18:06:14.471489 83304 server.go:117] Starting server go.micro.srv.example id go.micro.srv.example-59b6e0ab-0300-11e5-b696-68a86d0d36b6
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I0525 18:06:14.474960 83304 rpc_server.go:126] Listening on [::]:62216
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I0525 18:06:14.474997 83304 server.go:99] Registering node: go.micro.srv.example-59b6e0ab-0300-11e5-b696-68a86d0d36b6
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```
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### Test Service
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```
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$ go run examples/client/main.go
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go.micro.srv.example-59b6e0ab-0300-11e5-b696-68a86d0d36b6: Hello John
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```
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## Writing a service
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### Create request/response proto
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`go-micro/examples/server/proto/example/example.proto`:
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```
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syntax = "proto3";
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message Request {
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string name = 1;
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}
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message Response {
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string msg = 1;
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}
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```
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Compile proto `protoc -I$GOPATH/src --go_out=$GOPATH/src $GOPATH/src/github.com/myodc/go-micro/template/proto/example/example.proto`
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### Create request handler
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`go-micro/examples/server/handler/example.go`:
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```go
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package handler
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import (
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log "github.com/golang/glog"
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c "github.com/myodc/go-micro/context"
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example "github.com/myodc/go-micro/examples/server/proto/example"
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"github.com/myodc/go-micro/server"
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"golang.org/x/net/context"
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)
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type Example struct{}
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func (e *Example) Call(ctx context.Context, req *example.Request, rsp *example.Response) error {
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md, _ := c.GetMetadata(ctx)
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log.Info("Received Example.Call request with metadata: %v", md)
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rsp.Msg = server.Id + ": Hello " + req.Name
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return nil
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}
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```
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### Init server
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`go-micro/examples/server/main.go`:
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```go
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package main
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import (
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log "github.com/golang/glog"
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"github.com/myodc/go-micro/cmd"
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"github.com/myodc/go-micro/examples/server/handler"
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"github.com/myodc/go-micro/server"
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)
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func main() {
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// optionally setup command line usage
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cmd.Init()
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// Initialise Server
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server.Init(
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server.Name("go.micro.srv.example"),
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)
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// Register Handlers
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server.Handle(
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server.NewHandler(
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new(handler.Example),
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),
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)
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// Run server
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if err := server.Run(); err != nil {
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log.Fatal(err)
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}
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}
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```
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### Run service
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```
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$ go run examples/server/main.go
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I0525 18:06:14.471489 83304 server.go:117] Starting server go.micro.srv.example id go.micro.srv.example-59b6e0ab-0300-11e5-b696-68a86d0d36b6
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I0525 18:06:14.474960 83304 rpc_server.go:126] Listening on [::]:62216
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I0525 18:06:14.474997 83304 server.go:99] Registering node: go.micro.srv.example-59b6e0ab-0300-11e5-b696-68a86d0d36b6
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```
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