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198 lines
5.3 KiB
198 lines
5.3 KiB
package rpcclient
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"net/url"
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"reflect"
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"strings"
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"github.com/pkg/errors"
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types "github.com/tendermint/go-rpc/types"
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wire "github.com/tendermint/go-wire"
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)
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// HTTPClient is a common interface for JSONRPCClient and URIClient.
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type HTTPClient interface {
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Call(method string, params map[string]interface{}, result interface{}) (interface{}, error)
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}
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// TODO: Deprecate support for IP:PORT or /path/to/socket
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func makeHTTPDialer(remoteAddr string) (string, func(string, string) (net.Conn, error)) {
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parts := strings.SplitN(remoteAddr, "://", 2)
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var protocol, address string
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if len(parts) != 2 {
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log.Warn("WARNING (go-rpc): Please use fully formed listening addresses, including the tcp:// or unix:// prefix")
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protocol = types.SocketType(remoteAddr)
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address = remoteAddr
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} else {
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protocol, address = parts[0], parts[1]
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}
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trimmedAddress := strings.Replace(address, "/", ".", -1) // replace / with . for http requests (dummy domain)
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return trimmedAddress, func(proto, addr string) (net.Conn, error) {
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return net.Dial(protocol, address)
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}
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}
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// We overwrite the http.Client.Dial so we can do http over tcp or unix.
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// remoteAddr should be fully featured (eg. with tcp:// or unix://)
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func makeHTTPClient(remoteAddr string) (string, *http.Client) {
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address, dialer := makeHTTPDialer(remoteAddr)
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return "http://" + address, &http.Client{
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Transport: &http.Transport{
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Dial: dialer,
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},
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}
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}
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//------------------------------------------------------------------------------------
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// JSON rpc takes params as a slice
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type JSONRPCClient struct {
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address string
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client *http.Client
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}
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func NewJSONRPCClient(remote string) *JSONRPCClient {
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address, client := makeHTTPClient(remote)
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return &JSONRPCClient{
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address: address,
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client: client,
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}
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}
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func (c *JSONRPCClient) Call(method string, params map[string]interface{}, result interface{}) (interface{}, error) {
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// we need this step because we attempt to decode values using `go-wire`
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// (handlers.go:176) on the server side
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encodedParams := make(map[string]interface{})
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for k, v := range params {
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bytes := json.RawMessage(wire.JSONBytes(v))
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encodedParams[k] = &bytes
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}
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request := types.RPCRequest{
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JSONRPC: "2.0",
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Method: method,
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Params: encodedParams,
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ID: "",
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}
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requestBytes, err := json.Marshal(request)
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if err != nil {
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return nil, err
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}
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// log.Info(string(requestBytes))
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requestBuf := bytes.NewBuffer(requestBytes)
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// log.Info(Fmt("RPC request to %v (%v): %v", c.remote, method, string(requestBytes)))
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httpResponse, err := c.client.Post(c.address, "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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//-------------------------------------------------------------
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// URI takes params as a map
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type URIClient struct {
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address string
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client *http.Client
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}
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func NewURIClient(remote string) *URIClient {
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address, client := makeHTTPClient(remote)
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return &URIClient{
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address: address,
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client: client,
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}
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}
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func (c *URIClient) Call(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", c.address, method, values))
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resp, err := c.client.PostForm(c.address+"/"+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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// log.Notice("response", "response", string(responseBytes))
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var err error
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response := &types.RPCResponse{}
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err = json.Unmarshal(responseBytes, response)
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if err != nil {
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return nil, errors.Errorf("Error unmarshalling rpc response: %v", 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.Errorf("Response error: %v", 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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if err != nil {
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return nil, errors.Errorf("Error unmarshalling rpc response result: %v", err)
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}
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return result, nil
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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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// Convert byte slices to "0x"-prefixed hex
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byteSlice, isByteSlice := reflect.ValueOf(v).Interface().([]byte)
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if isByteSlice {
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args[k] = fmt.Sprintf("0x%X", byteSlice)
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continue
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}
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// Pass everything else to go-wire
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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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