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http_client.go
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http_client.go
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package rpcclient
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"reflect"
"strings"
"github.com/pkg/errors"
types "github.com/tendermint/tendermint/rpc/lib/types"
cmn "github.com/tendermint/tmlibs/common"
)
// HTTPClient is a common interface for JSONRPCClient and URIClient.
type HTTPClient interface {
Call(method string, params map[string]interface{}, result interface{}) (interface{}, error)
}
// TODO: Deprecate support for IP:PORT or /path/to/socket
func makeHTTPDialer(remoteAddr string) (string, func(string, string) (net.Conn, error)) {
parts := strings.SplitN(remoteAddr, "://", 2)
var protocol, address string
if len(parts) != 2 {
cmn.PanicSanity(fmt.Sprintf("Expected fully formed listening address, including the tcp:// or unix:// prefix, given %s", remoteAddr))
} else {
protocol, address = parts[0], parts[1]
}
trimmedAddress := strings.Replace(address, "/", ".", -1) // replace / with . for http requests (dummy domain)
return trimmedAddress, func(proto, addr string) (net.Conn, error) {
return net.Dial(protocol, address)
}
}
// We overwrite the http.Client.Dial so we can do http over tcp or unix.
// remoteAddr should be fully featured (eg. with tcp:// or unix://)
func makeHTTPClient(remoteAddr string) (string, *http.Client) {
address, dialer := makeHTTPDialer(remoteAddr)
return "http://" + address, &http.Client{
Transport: &http.Transport{
Dial: dialer,
},
}
}
//------------------------------------------------------------------------------------
// JSON rpc takes params as a slice
type JSONRPCClient struct {
address string
client *http.Client
}
func NewJSONRPCClient(remote string) *JSONRPCClient {
address, client := makeHTTPClient(remote)
return &JSONRPCClient{
address: address,
client: client,
}
}
func (c *JSONRPCClient) Call(method string, params map[string]interface{}, result interface{}) (interface{}, error) {
request, err := types.MapToRequest("", method, params)
if err != nil {
return nil, err
}
requestBytes, err := json.Marshal(request)
if err != nil {
return nil, err
}
// log.Info(string(requestBytes))
requestBuf := bytes.NewBuffer(requestBytes)
// log.Info(Fmt("RPC request to %v (%v): %v", c.remote, method, string(requestBytes)))
httpResponse, err := c.client.Post(c.address, "text/json", requestBuf)
if err != nil {
return nil, err
}
defer httpResponse.Body.Close()
responseBytes, err := ioutil.ReadAll(httpResponse.Body)
if err != nil {
return nil, err
}
// log.Info(Fmt("RPC response: %v", string(responseBytes)))
return unmarshalResponseBytes(responseBytes, result)
}
//-------------------------------------------------------------
// URI takes params as a map
type URIClient struct {
address string
client *http.Client
}
func NewURIClient(remote string) *URIClient {
address, client := makeHTTPClient(remote)
return &URIClient{
address: address,
client: client,
}
}
func (c *URIClient) Call(method string, params map[string]interface{}, result interface{}) (interface{}, error) {
values, err := argsToURLValues(params)
if err != nil {
return nil, err
}
// log.Info(Fmt("URI request to %v (%v): %v", c.address, method, values))
resp, err := c.client.PostForm(c.address+"/"+method, values)
if err != nil {
return nil, err
}
defer resp.Body.Close()
responseBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
return unmarshalResponseBytes(responseBytes, result)
}
//------------------------------------------------
func unmarshalResponseBytes(responseBytes []byte, result interface{}) (interface{}, error) {
// read response
// if rpc/core/types is imported, the result will unmarshal
// into the correct type
// log.Notice("response", "response", string(responseBytes))
var err error
response := &types.RPCResponse{}
err = json.Unmarshal(responseBytes, response)
if err != nil {
return nil, errors.Errorf("Error unmarshalling rpc response: %v", err)
}
errorStr := response.Error
if errorStr != "" {
return nil, errors.Errorf("Response error: %v", errorStr)
}
// unmarshal the RawMessage into the result
err = json.Unmarshal(*response.Result, result)
if err != nil {
return nil, errors.Errorf("Error unmarshalling rpc response result: %v", err)
}
return result, nil
}
func argsToURLValues(args map[string]interface{}) (url.Values, error) {
values := make(url.Values)
if len(args) == 0 {
return values, nil
}
err := argsToJson(args)
if err != nil {
return nil, err
}
for key, val := range args {
values.Set(key, val.(string))
}
return values, nil
}
func argsToJson(args map[string]interface{}) error {
for k, v := range args {
rt := reflect.TypeOf(v)
isByteSlice := rt.Kind() == reflect.Slice && rt.Elem().Kind() == reflect.Uint8
if isByteSlice {
bytes := reflect.ValueOf(v).Bytes()
args[k] = fmt.Sprintf("0x%X", bytes)
continue
}
// Pass everything else to go-wire
data, err := json.Marshal(v)
if err != nil {
return err
}
args[k] = string(data)
}
return nil
}