/
request.go
128 lines (104 loc) · 3.16 KB
/
request.go
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package rpc
import (
"encoding/json"
"io"
"net/http"
"github.com/pkg/errors"
"go.uber.org/zap"
)
const (
jsonRPCVersion = "2.0"
)
type (
// Request represents a standard JSON-RPC 2.0
// request: http://www.jsonrpc.org/specification#request_object.
Request struct {
JSONRPC string `json:"jsonrpc"`
Method string `json:"method"`
RawParams json.RawMessage `json:"params,omitempty"`
RawID json.RawMessage `json:"id,omitempty"`
}
// Response represents a standard JSON-RPC 2.0
// response: http://www.jsonrpc.org/specification#response_object.
Response struct {
JSONRPC string `json:"jsonrpc"`
Result interface{} `json:"result,omitempty"`
Error *Error `json:"error,omitempty"`
ID json.RawMessage `json:"id,omitempty"`
}
)
// NewRequest creates a new Request struct.
func NewRequest() *Request {
return &Request{
JSONRPC: jsonRPCVersion,
}
}
// DecodeData decodes the given reader into the the request
// struct.
func (r *Request) DecodeData(data io.ReadCloser) error {
defer data.Close()
err := json.NewDecoder(data).Decode(r)
if err != nil {
return errors.Errorf("error parsing JSON payload: %s", err)
}
if r.JSONRPC != jsonRPCVersion {
return errors.Errorf("invalid version, expected 2.0 got: '%s'", r.JSONRPC)
}
return nil
}
// Params takes a slice of any type and attempts to bind
// the params to it.
func (r *Request) Params() (*Params, error) {
params := Params{}
err := json.Unmarshal(r.RawParams, ¶ms)
if err != nil {
return nil, errors.Errorf("error parsing params field in payload: %s", err)
}
return ¶ms, nil
}
// WriteErrorResponse writes an error response to the ResponseWriter.
func (s *Server) WriteErrorResponse(r *Request, w http.ResponseWriter, err error) {
jsonErr, ok := err.(*Error)
if !ok {
jsonErr = NewInternalServerError("Internal server error", err)
}
response := Response{
JSONRPC: r.JSONRPC,
Error: jsonErr,
ID: r.RawID,
}
logFields := []zap.Field{
zap.Error(jsonErr.Cause),
zap.String("method", r.Method),
}
params, err := r.Params()
if err == nil {
logFields = append(logFields, zap.Any("params", params))
}
s.log.Error("Error encountered with rpc request", logFields...)
w.WriteHeader(jsonErr.HTTPCode)
s.writeServerResponse(r, w, response)
}
// WriteResponse encodes the response and writes it to the ResponseWriter.
func (s *Server) WriteResponse(r *Request, w http.ResponseWriter, result interface{}) {
response := Response{
JSONRPC: r.JSONRPC,
Result: result,
ID: r.RawID,
}
s.writeServerResponse(r, w, response)
}
func (s *Server) writeServerResponse(r *Request, w http.ResponseWriter, response Response) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
if s.config.EnableCORSWorkaround {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With")
}
encoder := json.NewEncoder(w)
err := encoder.Encode(response)
if err != nil {
s.log.Error("Error encountered while encoding response",
zap.String("err", err.Error()),
zap.String("method", r.Method))
}
}