3f047be5aa
All code outside of cmd/ is licensed as LGPL. The headers now reflect this by calling the whole work "the go-ethereum library".
143 lines
3.4 KiB
Go
143 lines
3.4 KiB
Go
// Copyright 2015 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// go-ethereum is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package codec
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"net"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/rpc/shared"
|
|
)
|
|
|
|
const (
|
|
READ_TIMEOUT = 60 // in seconds
|
|
MAX_REQUEST_SIZE = 1024 * 1024
|
|
MAX_RESPONSE_SIZE = 1024 * 1024
|
|
)
|
|
|
|
// Json serialization support
|
|
type JsonCodec struct {
|
|
c net.Conn
|
|
d *json.Decoder
|
|
}
|
|
|
|
// Create new JSON coder instance
|
|
func NewJsonCoder(conn net.Conn) ApiCoder {
|
|
return &JsonCodec{
|
|
c: conn,
|
|
d: json.NewDecoder(conn),
|
|
}
|
|
}
|
|
|
|
// Read incoming request and parse it to RPC request
|
|
func (self *JsonCodec) ReadRequest() (requests []*shared.Request, isBatch bool, err error) {
|
|
deadline := time.Now().Add(READ_TIMEOUT * time.Second)
|
|
if err := self.c.SetDeadline(deadline); err != nil {
|
|
return nil, false, err
|
|
}
|
|
|
|
var incoming json.RawMessage
|
|
err = self.d.Decode(&incoming)
|
|
if err == nil {
|
|
isBatch = incoming[0] == '['
|
|
if isBatch {
|
|
requests = make([]*shared.Request, 0)
|
|
err = json.Unmarshal(incoming, &requests)
|
|
} else {
|
|
requests = make([]*shared.Request, 1)
|
|
var singleRequest shared.Request
|
|
if err = json.Unmarshal(incoming, &singleRequest); err == nil {
|
|
requests[0] = &singleRequest
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
self.c.Close()
|
|
return nil, false, err
|
|
}
|
|
|
|
func (self *JsonCodec) ReadResponse() (interface{}, error) {
|
|
bytesInBuffer := 0
|
|
buf := make([]byte, MAX_RESPONSE_SIZE)
|
|
|
|
deadline := time.Now().Add(READ_TIMEOUT * time.Second)
|
|
if err := self.c.SetDeadline(deadline); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
for {
|
|
n, err := self.c.Read(buf[bytesInBuffer:])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
bytesInBuffer += n
|
|
|
|
var failure shared.ErrorResponse
|
|
if err = json.Unmarshal(buf[:bytesInBuffer], &failure); err == nil && failure.Error != nil {
|
|
return failure, fmt.Errorf(failure.Error.Message)
|
|
}
|
|
|
|
var success shared.SuccessResponse
|
|
if err = json.Unmarshal(buf[:bytesInBuffer], &success); err == nil {
|
|
return success, nil
|
|
}
|
|
}
|
|
|
|
self.c.Close()
|
|
return nil, fmt.Errorf("Unable to read response")
|
|
}
|
|
|
|
// Decode data
|
|
func (self *JsonCodec) Decode(data []byte, msg interface{}) error {
|
|
return json.Unmarshal(data, msg)
|
|
}
|
|
|
|
// Encode message
|
|
func (self *JsonCodec) Encode(msg interface{}) ([]byte, error) {
|
|
return json.Marshal(msg)
|
|
}
|
|
|
|
// Parse JSON data from conn to obj
|
|
func (self *JsonCodec) WriteResponse(res interface{}) error {
|
|
data, err := json.Marshal(res)
|
|
if err != nil {
|
|
self.c.Close()
|
|
return err
|
|
}
|
|
|
|
bytesWritten := 0
|
|
|
|
for bytesWritten < len(data) {
|
|
n, err := self.c.Write(data[bytesWritten:])
|
|
if err != nil {
|
|
self.c.Close()
|
|
return err
|
|
}
|
|
bytesWritten += n
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Close decoder and encoder
|
|
func (self *JsonCodec) Close() {
|
|
self.c.Close()
|
|
}
|