Glue

Note
Segment has paused maintenance on this project, but may return it to an active status in the future. Issues and pull requests from external contributors are not being considered, although internal contributions may appear from time to time. The project remains available under its open source license for anyone to use.

Glue generates client code for your Go RPC server. It currently supports

• net/rpc
• gorilla/rpc

Installation

go get github.com/segmentio/glue/cmd/glue

Then, glue should be available at $GOPATH/bin/glue (ideally, in your $PATH).

Usage

glue -name=Service -service=Math [path] will traverse the provided path (or working directory if none is provided) and generate clients for RPC methods (pointed at Math.*) declared on type Service.

Given the following is in a *.go file in your working directory,

package math

//go:generate glue -name Service -service Math
type Service struct{}

type SumArg struct {
	Values []int
}

type SumReply struct {
	Sum int
}

func (s *Service) Sum(arg SumArg, reply *SumReply) error {
	for _, v := range arg.Values {
		reply.Sum += v
	}

	return nil
}

go generate would output the following to clients/Service.go

package client

import (
	"github.com/segmentio/glue/example/stl/math"
)

type Client interface {
	Call(method string, args interface{}, reply interface{}) error
}

func NewMathClient(rpcClient Client) *Math {
	c := new(Math)
	c.RPC = rpcClient
	return c
}

type Math struct {
	RPC Client
}

func (c *Math) Sum(args math.SumArg) (*math.SumReply, error) {
	reply := new(math.SumReply)
	err := c.RPC.Call("Math.Sum", args, reply)
	return reply, err
}

Gorilla

If you use gorilla/rpc, you're in luck! Just specify -gorilla.

Options

Output

Glue always outputs code with client package. By default, this is in ./client, but you can change the output directory via -out.

To output code to STDOUT instead of files, supply -print.

FAQ

How do I use Glue with RPC implementation X?

Glue is modular. If you'd like support for another popular (or interesting, well-maintained) RPC implementation, open a PR to add a new Glue provider/.

Unfortunately, Go doesn't allow dynamic loading of packages so if you'd like Glue to support an internal or experimental RPC framework, fork Glue and supply another provider in cmd/glue/main.go.