127 lines
2.6 KiB
Go
127 lines
2.6 KiB
Go
package codec
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import (
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"encoding/json"
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"fmt"
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"net"
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"time"
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"github.com/ethereum/go-ethereum/rpc/shared"
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)
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const (
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READ_TIMEOUT = 60 // in seconds
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MAX_REQUEST_SIZE = 1024 * 1024
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MAX_RESPONSE_SIZE = 1024 * 1024
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)
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// Json serialization support
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type JsonCodec struct {
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c net.Conn
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d *json.Decoder
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}
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// Create new JSON coder instance
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func NewJsonCoder(conn net.Conn) ApiCoder {
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return &JsonCodec{
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c: conn,
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d: json.NewDecoder(conn),
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}
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}
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// Read incoming request and parse it to RPC request
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func (self *JsonCodec) ReadRequest() (requests []*shared.Request, isBatch bool, err error) {
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deadline := time.Now().Add(READ_TIMEOUT * time.Second)
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if err := self.c.SetDeadline(deadline); err != nil {
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return nil, false, err
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}
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var incoming json.RawMessage
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err = self.d.Decode(&incoming)
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if err == nil {
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isBatch = incoming[0] == '['
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if isBatch {
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requests = make([]*shared.Request, 0)
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err = json.Unmarshal(incoming, &requests)
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} else {
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requests = make([]*shared.Request, 1)
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var singleRequest shared.Request
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if err = json.Unmarshal(incoming, &singleRequest); err == nil {
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requests[0] = &singleRequest
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}
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}
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return
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}
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self.c.Close()
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return nil, false, err
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}
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func (self *JsonCodec) ReadResponse() (interface{}, error) {
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bytesInBuffer := 0
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buf := make([]byte, MAX_RESPONSE_SIZE)
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deadline := time.Now().Add(READ_TIMEOUT * time.Second)
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if err := self.c.SetDeadline(deadline); err != nil {
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return nil, err
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}
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for {
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n, err := self.c.Read(buf[bytesInBuffer:])
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if err != nil {
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return nil, err
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}
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bytesInBuffer += n
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var failure shared.ErrorResponse
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if err = json.Unmarshal(buf[:bytesInBuffer], &failure); err == nil && failure.Error != nil {
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return failure, fmt.Errorf(failure.Error.Message)
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}
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var success shared.SuccessResponse
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if err = json.Unmarshal(buf[:bytesInBuffer], &success); err == nil {
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return success, nil
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}
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}
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self.c.Close()
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return nil, fmt.Errorf("Unable to read response")
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}
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// Decode data
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func (self *JsonCodec) Decode(data []byte, msg interface{}) error {
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return json.Unmarshal(data, msg)
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}
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// Encode message
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func (self *JsonCodec) Encode(msg interface{}) ([]byte, error) {
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return json.Marshal(msg)
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}
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// Parse JSON data from conn to obj
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func (self *JsonCodec) WriteResponse(res interface{}) error {
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data, err := json.Marshal(res)
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if err != nil {
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self.c.Close()
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return err
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}
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bytesWritten := 0
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for bytesWritten < len(data) {
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n, err := self.c.Write(data[bytesWritten:])
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if err != nil {
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self.c.Close()
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return err
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}
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bytesWritten += n
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}
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return nil
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}
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// Close decoder and encoder
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func (self *JsonCodec) Close() {
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self.c.Close()
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}
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