Golang | Moonquakes

# Installing

go get -u github.com/sunquakes/jsonrpc4go

# Getting started

Server

package main

import (
	"github.com/sunquakes/jsonrpc4go"
)

type IntRpc struct{}

type Params struct {
	A int `json:"a"`
	B int `json:"b"`
}

func (i *IntRpc) Add(params *Params, result *int) error {
	a := params.A + params.B
	*result = interface{}(a).(int)
	return nil
}

func main() {
	s, _ := jsonrpc4go.NewServer("http", 3232) // the protocol is http
	s.Register(new(IntRpc))
	s.Start()
}

Client

package main

import (
	"fmt"
	"github.com/sunquakes/jsonrpc4go"
)

type Params struct {
	A int `json:"a"`
	B int `json:"b"`
}

func main() {
	result := new(int)
	c, _ := jsonrpc4go.NewClient("IntRpc", "http", "127.0.0.1:3232")
	err := c.Call("Add", Params{1, 6}, result, false)
	// data sent: {"id":"1604283212", "jsonrpc":"2.0", "method":"IntRpc/Add", "params":{"a":1,"b":6}}
	// data received: {"id":"1604283212", "jsonrpc":"2.0", "result":7}
	fmt.Println(err)     // nil
	fmt.Println(*result) // 7
}

# Router

# Rules

The are three part in the routing, the first part is the name of the struct. The second part is the separator /, the last part is the name of the struct method.

# How to define the routing of the service.

Declare the service struct, then the first part is IntRpc.

package main

type IntRpc struct{}

Declare the struct function.

package main

func (i *IntRpc) Add(params *Params, result *int) error {
	a := params.A + params.B
	*result = interface{}(a).(int)
	return nil
}

After start the server and register the struct, you can new a client to request jsonrpc2.0 data to the server, one client map one service.

c, _ := jsonrpc4go.NewClient("IntRpc", "http", "127.0.0.1:3232") // The first paramter is the service struct name.
err := c.Call("Add", Params{1, 6}, result, false) // The first paramter is the service struct function name.

The data of the client request to the server.

{
  "id": "1604283212",
  "jsonrpc": "2.0",
  "method": "IntRpc/Add",
  "params": {
    "a": 1,
    "b": 6
  }
}

The data of the server response to the client.

{
  "id": "1604283212",
  "jsonrpc": "2.0",
  "result": 7
}

# More features

TCP protocol

s, _ := jsonrpc4go.NewServer("tcp", 3232) // the protocol is tcp

c, _ := jsonrpc4go.NewClient("IntRpc", "tcp", "127.0.0.1:3232") // the protocol is tcp

Hooks (Add the following code before 's.Start()')

// Set the hook function of before method execution
s.SetBeforeFunc(func (id interface{}, method string, params interface{}) error {
// If the function returns an error, the program stops execution and returns an error message to the client
// return errors.New("Custom Error")
return nil
})
// Set the hook function of after method execution
s.SetAfterFunc(func (id interface{}, method string, result interface{}) error {
// If the function returns an error, the program stops execution and returns an error message to the client
// return errors.New("Custom Error")
return nil
})

Rate limit (Add the following code before 's.Start()')

s.SetRateLimit(20, 10) //The maximum concurrent number is 10, The maximum request speed is 20 times per second

Custom package EOF when the protocol is tcp

// Add the following code before 's.Start()'
s.SetOptions(server.TcpOptions{"aaaaaa", nil}) // Custom package EOF when the protocol is tcp
// Add the following code before 'c.Call()' or 'c.BatchCall()'
c.SetOptions(client.TcpOptions{"aaaaaa", nil}) // Custom package EOF when the protocol is tcp

Notify

// notify
result2 := new(Result2)
err2 := c.Call("Add2", Params{1, 6}, result2, true)
// data sent: {"jsonrpc":"2.0","method":"IntRpc/Add2","params":{"a":1,"b":6}}
// data received: {"jsonrpc":"2.0","result":{"c":7}}
fmt.Println(err2) // nil
fmt.Println(*result2) // {7}

Batch call

// batch call
result3 := new(int)
err3 := c.BatchAppend("Add1", Params{1, 6}, result3, false)
result4 := new(int)
err4 := c.BatchAppend("Add", Params{2, 3}, result4, false)
c.BatchCall()
// data sent: [{"id":"1604283212","jsonrpc":"2.0","method":"IntRpc/Add1","params":{"a":1,"b":6}},{"id":"1604283212","jsonrpc":"2.0","method":"IntRpc/Add","params":{"a":2,"b":3}}]
// data received: [{"id":"1604283212","jsonrpc":"2.0","error":{"code":-32601,"message":"Method not found","data":null}},{"id":"1604283212","jsonrpc":"2.0","result":5}]
fmt.Println((*err3).Error()) // Method not found
fmt.Println(*result3) // 0
fmt.Println(*err4)    // nil
fmt.Println(*result4) // 5

Client-Side Load-Balancing

c, _ := jsonrpc4go.NewClient("IntRpc", "tcp", "127.0.0.1:3232,127.0.0.1:3233,127.0.0.1:3234")

# Service registration & discovery

# Consul

/**
 * check: true or false. The switch of the health check.
 * interval: The interval of the health check. For example: 10s.
 * timeout: Timeout. For example: 10s.
 * instanceId: Instance ID. Distinguish the same service in different nodes. For example: 1.
 */
dc, _ := consul.NewConsul("http://localhost:8500?check=true&instanceId=1&interval=10s&timeout=10s")

// Set in the server.
s, _ := jsonrpc4go.NewServer("tcp", 3614)
// If the default node ip is used, the second parameter can be set ""
s.SetDiscovery(dc, "127.0.0.1")
s.Register(new(IntRpc))
s.Start()

// Set in the client
c, _ := jsonrpc4go.NewClient("IntRpc", "tcp", dc)

# Nacos

dc, _ := nacos.NewNacos("http://127.0.0.1:8849")

// Set in the server.
s, _ := jsonrpc4go.NewServer("tcp", 3616)
// If the default node ip is used, the second parameter can be set ""
s.SetDiscovery(dc, "127.0.0.1")
s.Register(new(IntRpc))
s.Start()

// Set in the client
c, _ := jsonrpc4go.NewClient("IntRpc", "tcp", dc)

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