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|
package rpc
import (
"encoding/json"
"fmt"
"reflect"
"sync/atomic"
"github.com/ethereum/go-ethereum/rpc/comms"
"github.com/ethereum/go-ethereum/rpc/shared"
)
// Xeth is a native API interface to a remote node.
type Xeth struct {
client comms.EthereumClient
reqId uint32
}
// NewXeth constructs a new native API interface to a remote node.
func NewXeth(client comms.EthereumClient) *Xeth {
return &Xeth{
client: client,
}
}
// Call invokes a method with the given parameters are the remote node.
func (self *Xeth) Call(method string, params []interface{}) (map[string]interface{}, error) {
// Assemble the json RPC request
data, err := json.Marshal(params)
if err != nil {
return nil, err
}
req := &shared.Request{
Id: atomic.AddUint32(&self.reqId, 1),
Jsonrpc: "2.0",
Method: method,
Params: data,
}
// Send the request over and process the response
if err := self.client.Send(req); err != nil {
return nil, err
}
res, err := self.client.Recv()
if err != nil {
return nil, err
}
value, ok := res.(map[string]interface{})
if !ok {
return nil, fmt.Errorf("Invalid response type: have %v, want %v", reflect.TypeOf(res), reflect.TypeOf(make(map[string]interface{})))
}
return value, nil
}
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