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// Copyright 2015 The go-ethereum Authors
// This file is part of go-ethereum.
//
// 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.
//
// go-ethereum 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 go-ethereum. 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()
}
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