You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
405 lines
12 KiB
405 lines
12 KiB
package rpcclient
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"net"
|
|
"net/http"
|
|
"net/url"
|
|
"reflect"
|
|
"strings"
|
|
"sync"
|
|
|
|
"github.com/pkg/errors"
|
|
|
|
amino "github.com/tendermint/go-amino"
|
|
|
|
cmn "github.com/tendermint/tendermint/libs/common"
|
|
types "github.com/tendermint/tendermint/rpc/lib/types"
|
|
)
|
|
|
|
const (
|
|
protoHTTP = "http"
|
|
protoHTTPS = "https"
|
|
protoWSS = "wss"
|
|
protoWS = "ws"
|
|
protoTCP = "tcp"
|
|
)
|
|
|
|
// HTTPClient is a common interface for JSONRPCClient and URIClient.
|
|
type HTTPClient interface {
|
|
Call(method string, params map[string]interface{}, result interface{}) (interface{}, error)
|
|
Codec() *amino.Codec
|
|
SetCodec(*amino.Codec)
|
|
}
|
|
|
|
// TODO: Deprecate support for IP:PORT or /path/to/socket
|
|
func makeHTTPDialer(remoteAddr string) (string, string, func(string, string) (net.Conn, error)) {
|
|
// protocol to use for http operations, to support both http and https
|
|
clientProtocol := protoHTTP
|
|
|
|
parts := strings.SplitN(remoteAddr, "://", 2)
|
|
var protocol, address string
|
|
switch {
|
|
case len(parts) == 1:
|
|
// default to tcp if nothing specified
|
|
protocol, address = protoTCP, remoteAddr
|
|
case len(parts) == 2:
|
|
protocol, address = parts[0], parts[1]
|
|
default:
|
|
// return a invalid message
|
|
msg := fmt.Sprintf("Invalid addr: %s", remoteAddr)
|
|
return clientProtocol, msg, func(_ string, _ string) (net.Conn, error) {
|
|
return nil, errors.New(msg)
|
|
}
|
|
}
|
|
|
|
// accept http as an alias for tcp and set the client protocol
|
|
switch protocol {
|
|
case protoHTTP, protoHTTPS:
|
|
clientProtocol = protocol
|
|
protocol = protoTCP
|
|
case protoWS, protoWSS:
|
|
clientProtocol = protocol
|
|
}
|
|
|
|
// replace / with . for http requests (kvstore domain)
|
|
trimmedAddress := strings.Replace(address, "/", ".", -1)
|
|
return clientProtocol, 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) {
|
|
protocol, address, dialer := makeHTTPDialer(remoteAddr)
|
|
return protocol + "://" + address, &http.Client{
|
|
Transport: &http.Transport{
|
|
// Set to true to prevent GZIP-bomb DoS attacks
|
|
DisableCompression: true,
|
|
Dial: dialer,
|
|
},
|
|
}
|
|
}
|
|
|
|
//------------------------------------------------------------------------------------
|
|
|
|
// jsonRPCBufferedRequest encapsulates a single buffered request, as well as its
|
|
// anticipated response structure.
|
|
type jsonRPCBufferedRequest struct {
|
|
request types.RPCRequest
|
|
result interface{} // The result will be deserialized into this object.
|
|
}
|
|
|
|
// JSONRPCRequestBatch allows us to buffer multiple request/response structures
|
|
// into a single batch request. Note that this batch acts like a FIFO queue, and
|
|
// is thread-safe.
|
|
type JSONRPCRequestBatch struct {
|
|
client *JSONRPCClient
|
|
|
|
mtx sync.Mutex
|
|
requests []*jsonRPCBufferedRequest
|
|
}
|
|
|
|
// JSONRPCClient takes params as a slice
|
|
type JSONRPCClient struct {
|
|
address string
|
|
client *http.Client
|
|
id types.JSONRPCStringID
|
|
cdc *amino.Codec
|
|
}
|
|
|
|
// JSONRPCCaller implementers can facilitate calling the JSON RPC endpoint.
|
|
type JSONRPCCaller interface {
|
|
Call(method string, params map[string]interface{}, result interface{}) (interface{}, error)
|
|
}
|
|
|
|
// Both JSONRPCClient and JSONRPCRequestBatch can facilitate calls to the JSON
|
|
// RPC endpoint.
|
|
var _ JSONRPCCaller = (*JSONRPCClient)(nil)
|
|
var _ JSONRPCCaller = (*JSONRPCRequestBatch)(nil)
|
|
|
|
// NewJSONRPCClient returns a JSONRPCClient pointed at the given address.
|
|
func NewJSONRPCClient(remote string) *JSONRPCClient {
|
|
address, client := makeHTTPClient(remote)
|
|
return &JSONRPCClient{
|
|
address: address,
|
|
client: client,
|
|
id: types.JSONRPCStringID("jsonrpc-client-" + cmn.RandStr(8)),
|
|
cdc: amino.NewCodec(),
|
|
}
|
|
}
|
|
|
|
// Call will send the request for the given method through to the RPC endpoint
|
|
// immediately, without buffering of requests.
|
|
func (c *JSONRPCClient) Call(method string, params map[string]interface{}, result interface{}) (interface{}, error) {
|
|
request, err := types.MapToRequest(c.cdc, c.id, method, params)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
requestBytes, err := json.Marshal(request)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
requestBuf := bytes.NewBuffer(requestBytes)
|
|
httpResponse, err := c.client.Post(c.address, "text/json", requestBuf)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer httpResponse.Body.Close() // nolint: errcheck
|
|
|
|
responseBytes, err := ioutil.ReadAll(httpResponse.Body)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return unmarshalResponseBytes(c.cdc, responseBytes, c.id, result)
|
|
}
|
|
|
|
// NewRequestBatch starts a batch of requests for this client.
|
|
func (c *JSONRPCClient) NewRequestBatch() *JSONRPCRequestBatch {
|
|
return &JSONRPCRequestBatch{
|
|
requests: make([]*jsonRPCBufferedRequest, 0),
|
|
client: c,
|
|
}
|
|
}
|
|
|
|
func (c *JSONRPCClient) sendBatch(requests []*jsonRPCBufferedRequest) ([]interface{}, error) {
|
|
reqs := make([]types.RPCRequest, 0, len(requests))
|
|
results := make([]interface{}, 0, len(requests))
|
|
for _, req := range requests {
|
|
reqs = append(reqs, req.request)
|
|
results = append(results, req.result)
|
|
}
|
|
// serialize the array of requests into a single JSON object
|
|
requestBytes, err := json.Marshal(reqs)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
httpResponse, err := c.client.Post(c.address, "text/json", bytes.NewBuffer(requestBytes))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer httpResponse.Body.Close() // nolint: errcheck
|
|
|
|
responseBytes, err := ioutil.ReadAll(httpResponse.Body)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return unmarshalResponseBytesArray(c.cdc, responseBytes, c.id, results)
|
|
}
|
|
|
|
func (c *JSONRPCClient) Codec() *amino.Codec {
|
|
return c.cdc
|
|
}
|
|
|
|
func (c *JSONRPCClient) SetCodec(cdc *amino.Codec) {
|
|
c.cdc = cdc
|
|
}
|
|
|
|
//-------------------------------------------------------------
|
|
|
|
// Count returns the number of enqueued requests waiting to be sent.
|
|
func (b *JSONRPCRequestBatch) Count() int {
|
|
b.mtx.Lock()
|
|
defer b.mtx.Unlock()
|
|
return len(b.requests)
|
|
}
|
|
|
|
func (b *JSONRPCRequestBatch) enqueue(req *jsonRPCBufferedRequest) {
|
|
b.mtx.Lock()
|
|
defer b.mtx.Unlock()
|
|
b.requests = append(b.requests, req)
|
|
}
|
|
|
|
// Clear empties out the request batch.
|
|
func (b *JSONRPCRequestBatch) Clear() int {
|
|
b.mtx.Lock()
|
|
defer b.mtx.Unlock()
|
|
return b.clear()
|
|
}
|
|
|
|
func (b *JSONRPCRequestBatch) clear() int {
|
|
count := len(b.requests)
|
|
b.requests = make([]*jsonRPCBufferedRequest, 0)
|
|
return count
|
|
}
|
|
|
|
// Send will attempt to send the current batch of enqueued requests, and then
|
|
// will clear out the requests once done. On success, this returns the
|
|
// deserialized list of results from each of the enqueued requests.
|
|
func (b *JSONRPCRequestBatch) Send() ([]interface{}, error) {
|
|
b.mtx.Lock()
|
|
defer func() {
|
|
b.clear()
|
|
b.mtx.Unlock()
|
|
}()
|
|
return b.client.sendBatch(b.requests)
|
|
}
|
|
|
|
// Call enqueues a request to call the given RPC method with the specified
|
|
// parameters, in the same way that the `JSONRPCClient.Call` function would.
|
|
func (b *JSONRPCRequestBatch) Call(method string, params map[string]interface{}, result interface{}) (interface{}, error) {
|
|
request, err := types.MapToRequest(b.client.cdc, b.client.id, method, params)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
b.enqueue(&jsonRPCBufferedRequest{request: request, result: result})
|
|
return result, nil
|
|
}
|
|
|
|
//-------------------------------------------------------------
|
|
|
|
// URI takes params as a map
|
|
type URIClient struct {
|
|
address string
|
|
client *http.Client
|
|
cdc *amino.Codec
|
|
}
|
|
|
|
func NewURIClient(remote string) *URIClient {
|
|
address, client := makeHTTPClient(remote)
|
|
return &URIClient{
|
|
address: address,
|
|
client: client,
|
|
cdc: amino.NewCodec(),
|
|
}
|
|
}
|
|
|
|
func (c *URIClient) Call(method string, params map[string]interface{}, result interface{}) (interface{}, error) {
|
|
values, err := argsToURLValues(c.cdc, 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() // nolint: errcheck
|
|
|
|
responseBytes, err := ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return unmarshalResponseBytes(c.cdc, responseBytes, "", result)
|
|
}
|
|
|
|
func (c *URIClient) Codec() *amino.Codec {
|
|
return c.cdc
|
|
}
|
|
|
|
func (c *URIClient) SetCodec(cdc *amino.Codec) {
|
|
c.cdc = cdc
|
|
}
|
|
|
|
//------------------------------------------------
|
|
|
|
func unmarshalResponseBytes(cdc *amino.Codec, responseBytes []byte, expectedID types.JSONRPCStringID, 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.Wrap(err, "error unmarshalling rpc response")
|
|
}
|
|
if response.Error != nil {
|
|
return nil, errors.Wrap(response.Error, "response error")
|
|
}
|
|
// From the JSON-RPC 2.0 spec:
|
|
// id: It MUST be the same as the value of the id member in the Request Object.
|
|
if err := validateResponseID(response, expectedID); err != nil {
|
|
return nil, err
|
|
}
|
|
// Unmarshal the RawMessage into the result.
|
|
err = cdc.UnmarshalJSON(response.Result, result)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "error unmarshalling rpc response result")
|
|
}
|
|
return result, nil
|
|
}
|
|
|
|
func unmarshalResponseBytesArray(cdc *amino.Codec, responseBytes []byte, expectedID types.JSONRPCStringID, results []interface{}) ([]interface{}, error) {
|
|
var (
|
|
err error
|
|
responses []types.RPCResponse
|
|
)
|
|
err = json.Unmarshal(responseBytes, &responses)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "error unmarshalling rpc response")
|
|
}
|
|
// No response error checking here as there may be a mixture of successful
|
|
// and unsuccessful responses.
|
|
|
|
if len(results) != len(responses) {
|
|
return nil, errors.Errorf("expected %d result objects into which to inject responses, but got %d", len(responses), len(results))
|
|
}
|
|
|
|
for i, response := range responses {
|
|
// From the JSON-RPC 2.0 spec:
|
|
// id: It MUST be the same as the value of the id member in the Request Object.
|
|
if err := validateResponseID(&response, expectedID); err != nil {
|
|
return nil, errors.Wrapf(err, "failed to validate response ID in response %d", i)
|
|
}
|
|
if err := cdc.UnmarshalJSON(responses[i].Result, results[i]); err != nil {
|
|
return nil, errors.Wrap(err, "error unmarshalling rpc response result")
|
|
}
|
|
}
|
|
return results, nil
|
|
}
|
|
|
|
func validateResponseID(res *types.RPCResponse, expectedID types.JSONRPCStringID) error {
|
|
// we only validate a response ID if the expected ID is non-empty
|
|
if len(expectedID) == 0 {
|
|
return nil
|
|
}
|
|
if res.ID == nil {
|
|
return errors.Errorf("missing ID in response")
|
|
}
|
|
id, ok := res.ID.(types.JSONRPCStringID)
|
|
if !ok {
|
|
return errors.Errorf("expected ID string in response but got: %v", id)
|
|
}
|
|
if expectedID != id {
|
|
return errors.Errorf("response ID (%s) does not match request ID (%s)", id, expectedID)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func argsToURLValues(cdc *amino.Codec, args map[string]interface{}) (url.Values, error) {
|
|
values := make(url.Values)
|
|
if len(args) == 0 {
|
|
return values, nil
|
|
}
|
|
err := argsToJSON(cdc, args)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for key, val := range args {
|
|
values.Set(key, val.(string))
|
|
}
|
|
return values, nil
|
|
}
|
|
|
|
func argsToJSON(cdc *amino.Codec, 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
|
|
}
|
|
|
|
data, err := cdc.MarshalJSON(v)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
args[k] = string(data)
|
|
}
|
|
return nil
|
|
}
|