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184 lines
3.9 KiB
184 lines
3.9 KiB
package rpc
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import (
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"bytes"
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"fmt"
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"github.com/tendermint/tendermint/binary"
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"io/ioutil"
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"net/http"
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"net/url"
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//"reflect"
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// Uncomment to use go:generate
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// _ "github.com/ebuchman/go-rpc-gen"
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)
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type Response struct {
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Status string
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Data interface{}
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Error string
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}
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//go:generate go-rpc-gen -interface Client -pkg core -type *ClientHTTP,*ClientJSON -exclude pipe.go -out-pkg rpc
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type ClientJSON struct {
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addr string
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}
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type ClientHTTP struct {
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addr string
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}
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func NewClient(addr, typ string) Client {
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switch typ {
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case "HTTP":
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return &ClientHTTP{addr}
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case "JSONRPC":
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return &ClientJSON{addr}
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}
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return nil
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}
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func argsToJson(args ...interface{}) ([]string, error) {
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l := len(args)
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jsons := make([]string, l)
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n, err := new(int64), new(error)
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for i, a := range args {
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buf := new(bytes.Buffer)
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binary.WriteJSON(a, buf, n, err)
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if *err != nil {
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return nil, *err
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}
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jsons[i] = string(buf.Bytes())
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}
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return jsons, nil
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}
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func (c *ClientJSON) RequestResponse(s RPCRequest) (b []byte, err error) {
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b = binary.JSONBytes(s)
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buf := bytes.NewBuffer(b)
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resp, err := http.Post(c.addr, "text/json", buf)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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return ioutil.ReadAll(resp.Body)
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}
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/*
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What follows is used by `rpc-gen` when `go generate` is called
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to populate the rpc client methods
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*/
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// first we define the base interface, which rpc-gen will further populate with generated methods
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/*rpc-gen:define-interface Client
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type Client interface {
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Address() string // returns the remote address
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}
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*/
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// encoding functions
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func binaryWriter(args ...interface{}) ([]interface{}, error) {
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list := []interface{}{}
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for _, a := range args {
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buf, n, err := new(bytes.Buffer), new(int64), new(error)
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binary.WriteJSON(a, buf, n, err)
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if *err != nil {
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return nil, *err
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}
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list = append(list, buf.Bytes())
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}
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return list, nil
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}
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func argsToURLValues(argNames []string, args ...interface{}) (url.Values, error) {
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values := make(url.Values)
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if len(argNames) == 0 {
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return values, nil
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}
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if len(argNames) != len(args) {
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return nil, fmt.Errorf("argNames and args have different lengths: %d, %d", len(argNames), len(args))
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}
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slice, err := argsToJson(args...)
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if err != nil {
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return nil, err
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}
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for i, name := range argNames {
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s := slice[i]
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values.Set(name, s) // s[0]
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/*for j := 1; j < len(s); j++ {
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values.Add(name, s[j])
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}*/
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}
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return values, nil
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}
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// import statements we will need for the templates
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/*rpc-gen:imports:
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github.com/tendermint/tendermint/binary
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net/http
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io/ioutil
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fmt
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*/
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// Template functions to be filled in
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/*rpc-gen:template:*ClientJSON func (c *ClientJSON) {{name}}({{args.def}}) ({{response}}) {
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request := RPCRequest{
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JSONRPC: "2.0",
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Method: reverseFuncMap["{{name}}"],
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Params: []interface{}{ {{args.ident}} },
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Id: 0,
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}
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body, err := c.RequestResponse(request)
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if err != nil{
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return nil, err
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}
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var response struct {
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Result {{response.0}} `json:"result"`
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Error string `json:"error"`
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Id string `json:"id"`
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JSONRPC string `json:"jsonrpc"`
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}
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binary.ReadJSON(&response, body, &err)
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if err != nil {
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return nil, err
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}
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if response.Error != ""{
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return nil, fmt.Errorf(response.Error)
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}
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return response.Result, nil
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}*/
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/*rpc-gen:template:*ClientHTTP func (c *ClientHTTP) {{name}}({{args.def}}) ({{response}}){
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values, err := argsToURLValues({{args.name}}, {{args.ident}})
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if err != nil{
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return nil, err
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}
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resp, err := http.PostForm(c.addr+reverseFuncMap["{{name}}"], values)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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var response struct {
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Result {{response.0}} `json:"result"`
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Error string `json:"error"`
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Id string `json:"id"`
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JSONRPC string `json:"jsonrpc"`
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}
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binary.ReadJSON(&response, body, &err)
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if err != nil {
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return nil, err
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}
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if response.Error != ""{
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return nil, fmt.Errorf(response.Error)
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}
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return response.Result, nil
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}*/
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