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136 lines
3.3 KiB
136 lines
3.3 KiB
package rpcclient
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import (
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"bytes"
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"encoding/json"
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"errors"
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"io/ioutil"
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"net/http"
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"net/url"
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"strings"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/go-rpc/types"
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"github.com/tendermint/go-wire"
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)
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// JSON rpc takes params as a slice
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type ClientJSONRPC struct {
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remote string
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}
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func NewClientJSONRPC(remote string) *ClientJSONRPC {
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return &ClientJSONRPC{remote}
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}
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func (c *ClientJSONRPC) Call(method string, params []interface{}, result interface{}) (interface{}, error) {
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return CallHTTP_JSONRPC(c.remote, method, params, result)
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}
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// URI takes params as a map
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type ClientURI struct {
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remote string
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}
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func NewClientURI(remote string) *ClientURI {
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if !strings.HasSuffix(remote, "/") {
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remote = remote + "/"
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}
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return &ClientURI{remote}
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}
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func (c *ClientURI) Call(method string, params map[string]interface{}, result interface{}) (interface{}, error) {
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return CallHTTP_URI(c.remote, method, params, result)
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}
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func CallHTTP_JSONRPC(remote string, method string, params []interface{}, result interface{}) (interface{}, error) {
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// Make request and get responseBytes
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request := rpctypes.RPCRequest{
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JSONRPC: "2.0",
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Method: method,
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Params: params,
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ID: "",
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}
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requestBytes := wire.JSONBytes(request)
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requestBuf := bytes.NewBuffer(requestBytes)
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log.Info(Fmt("RPC request to %v (%v): %v", remote, method, string(requestBytes)))
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httpResponse, err := http.Post(remote, "text/json", requestBuf)
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if err != nil {
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return nil, err
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}
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defer httpResponse.Body.Close()
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responseBytes, err := ioutil.ReadAll(httpResponse.Body)
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if err != nil {
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return nil, err
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}
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log.Info(Fmt("RPC response: %v", string(responseBytes)))
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return unmarshalResponseBytes(responseBytes, result)
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}
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func CallHTTP_URI(remote string, method string, params map[string]interface{}, result interface{}) (interface{}, error) {
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values, err := argsToURLValues(params)
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if err != nil {
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return nil, err
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}
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log.Info(Fmt("URI request to %v (%v): %v", remote, method, values))
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resp, err := http.PostForm(remote+method, 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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responseBytes, 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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return unmarshalResponseBytes(responseBytes, result)
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}
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//------------------------------------------------
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func unmarshalResponseBytes(responseBytes []byte, result interface{}) (interface{}, error) {
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// read response
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// if rpc/core/types is imported, the result will unmarshal
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// into the correct type
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var err error
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response := &rpctypes.RPCResponse{}
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err = json.Unmarshal(responseBytes, response)
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if err != nil {
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return nil, err
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}
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errorStr := response.Error
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if errorStr != "" {
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return nil, errors.New(errorStr)
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}
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// unmarshal the RawMessage into the result
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result = wire.ReadJSONPtr(result, *response.Result, &err)
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return result, err
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}
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func argsToURLValues(args map[string]interface{}) (url.Values, error) {
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values := make(url.Values)
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if len(args) == 0 {
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return values, nil
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}
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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 key, val := range args {
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values.Set(key, val.(string))
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}
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return values, nil
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}
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func argsToJson(args map[string]interface{}) error {
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var n int
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var err error
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for k, v := range args {
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buf := new(bytes.Buffer)
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wire.WriteJSON(v, buf, &n, &err)
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if err != nil {
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return err
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}
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args[k] = buf.String()
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}
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return nil
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}
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