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types.go
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types.go
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package rpctypes
import (
"context"
"encoding/json"
"fmt"
"net/http"
"reflect"
"strings"
"github.com/pkg/errors"
amino "github.com/tendermint/go-amino"
)
// a wrapper to emulate a sum type: jsonrpcid = string | int
// TODO: refactor when Go 2.0 arrives https://github.com/golang/go/issues/19412
type jsonrpcid interface {
isJSONRPCID()
}
// JSONRPCStringID a wrapper for JSON-RPC string IDs
type JSONRPCStringID string
func (JSONRPCStringID) isJSONRPCID() {}
// JSONRPCIntID a wrapper for JSON-RPC integer IDs
type JSONRPCIntID int
func (JSONRPCIntID) isJSONRPCID() {}
func idFromInterface(idInterface interface{}) (jsonrpcid, error) {
switch id := idInterface.(type) {
case string:
return JSONRPCStringID(id), nil
case float64:
// json.Unmarshal uses float64 for all numbers
// (https://golang.org/pkg/encoding/json/#Unmarshal),
// but the JSONRPC2.0 spec says the id SHOULD NOT contain
// decimals - so we truncate the decimals here.
return JSONRPCIntID(int(id)), nil
default:
typ := reflect.TypeOf(id)
return nil, fmt.Errorf("JSON-RPC ID (%v) is of unknown type (%v)", id, typ)
}
}
//----------------------------------------
// REQUEST
type RPCRequest struct {
JSONRPC string `json:"jsonrpc"`
ID jsonrpcid `json:"id"`
Method string `json:"method"`
Params json.RawMessage `json:"params"` // must be map[string]interface{} or []interface{}
}
// UnmarshalJSON custom JSON unmarshalling due to jsonrpcid being string or int
func (request *RPCRequest) UnmarshalJSON(data []byte) error {
unsafeReq := &struct {
JSONRPC string `json:"jsonrpc"`
ID interface{} `json:"id"`
Method string `json:"method"`
Params json.RawMessage `json:"params"` // must be map[string]interface{} or []interface{}
}{}
err := json.Unmarshal(data, &unsafeReq)
if err != nil {
return err
}
request.JSONRPC = unsafeReq.JSONRPC
request.Method = unsafeReq.Method
request.Params = unsafeReq.Params
if unsafeReq.ID == nil {
return nil
}
id, err := idFromInterface(unsafeReq.ID)
if err != nil {
return err
}
request.ID = id
return nil
}
func NewRPCRequest(id jsonrpcid, method string, params json.RawMessage) RPCRequest {
return RPCRequest{
JSONRPC: "2.0",
ID: id,
Method: method,
Params: params,
}
}
func (req RPCRequest) String() string {
return fmt.Sprintf("[%s %s]", req.ID, req.Method)
}
func MapToRequest(cdc *amino.Codec, id jsonrpcid, method string, params map[string]interface{}) (RPCRequest, error) {
var params_ = make(map[string]json.RawMessage, len(params))
for name, value := range params {
valueJSON, err := cdc.MarshalJSON(value)
if err != nil {
return RPCRequest{}, err
}
params_[name] = valueJSON
}
payload, err := json.Marshal(params_) // NOTE: Amino doesn't handle maps yet.
if err != nil {
return RPCRequest{}, err
}
request := NewRPCRequest(id, method, payload)
return request, nil
}
func ArrayToRequest(cdc *amino.Codec, id jsonrpcid, method string, params []interface{}) (RPCRequest, error) {
var params_ = make([]json.RawMessage, len(params))
for i, value := range params {
valueJSON, err := cdc.MarshalJSON(value)
if err != nil {
return RPCRequest{}, err
}
params_[i] = valueJSON
}
payload, err := json.Marshal(params_) // NOTE: Amino doesn't handle maps yet.
if err != nil {
return RPCRequest{}, err
}
request := NewRPCRequest(id, method, payload)
return request, nil
}
//----------------------------------------
// RESPONSE
type RPCError struct {
Code int `json:"code"`
Message string `json:"message"`
Data string `json:"data,omitempty"`
}
func (err RPCError) Error() string {
const baseFormat = "RPC error %v - %s"
if err.Data != "" {
return fmt.Sprintf(baseFormat+": %s", err.Code, err.Message, err.Data)
}
return fmt.Sprintf(baseFormat, err.Code, err.Message)
}
type RPCResponse struct {
JSONRPC string `json:"jsonrpc"`
ID jsonrpcid `json:"id"`
Result json.RawMessage `json:"result,omitempty"`
Error *RPCError `json:"error,omitempty"`
}
// UnmarshalJSON custom JSON unmarshalling due to jsonrpcid being string or int
func (response *RPCResponse) UnmarshalJSON(data []byte) error {
unsafeResp := &struct {
JSONRPC string `json:"jsonrpc"`
ID interface{} `json:"id"`
Result json.RawMessage `json:"result,omitempty"`
Error *RPCError `json:"error,omitempty"`
}{}
err := json.Unmarshal(data, &unsafeResp)
if err != nil {
return err
}
response.JSONRPC = unsafeResp.JSONRPC
response.Error = unsafeResp.Error
response.Result = unsafeResp.Result
if unsafeResp.ID == nil {
return nil
}
id, err := idFromInterface(unsafeResp.ID)
if err != nil {
return err
}
response.ID = id
return nil
}
func NewRPCSuccessResponse(cdc *amino.Codec, id jsonrpcid, res interface{}) RPCResponse {
var rawMsg json.RawMessage
if res != nil {
var js []byte
js, err := cdc.MarshalJSON(res)
if err != nil {
return RPCInternalError(id, errors.Wrap(err, "Error marshalling response"))
}
rawMsg = json.RawMessage(js)
}
return RPCResponse{JSONRPC: "2.0", ID: id, Result: rawMsg}
}
func NewRPCErrorResponse(id jsonrpcid, code int, msg string, data string) RPCResponse {
return RPCResponse{
JSONRPC: "2.0",
ID: id,
Error: &RPCError{Code: code, Message: msg, Data: data},
}
}
func (resp RPCResponse) String() string {
if resp.Error == nil {
return fmt.Sprintf("[%s %v]", resp.ID, resp.Result)
}
return fmt.Sprintf("[%s %s]", resp.ID, resp.Error)
}
func RPCParseError(id jsonrpcid, err error) RPCResponse {
return NewRPCErrorResponse(id, -32700, "Parse error. Invalid JSON", err.Error())
}
func RPCInvalidRequestError(id jsonrpcid, err error) RPCResponse {
return NewRPCErrorResponse(id, -32600, "Invalid Request", err.Error())
}
func RPCMethodNotFoundError(id jsonrpcid) RPCResponse {
return NewRPCErrorResponse(id, -32601, "Method not found", "")
}
func RPCInvalidParamsError(id jsonrpcid, err error) RPCResponse {
return NewRPCErrorResponse(id, -32602, "Invalid params", err.Error())
}
func RPCInternalError(id jsonrpcid, err error) RPCResponse {
return NewRPCErrorResponse(id, -32603, "Internal error", err.Error())
}
func RPCServerError(id jsonrpcid, err error) RPCResponse {
return NewRPCErrorResponse(id, -32000, "Server error", err.Error())
}
//----------------------------------------
// WSRPCConnection represents a websocket connection.
type WSRPCConnection interface {
// GetRemoteAddr returns a remote address of the connection.
GetRemoteAddr() string
// WriteRPCResponse writes the resp onto connection (BLOCKING).
WriteRPCResponse(resp RPCResponse)
// TryWriteRPCResponse tries to write the resp onto connection (NON-BLOCKING).
TryWriteRPCResponse(resp RPCResponse) bool
// Codec returns an Amino codec used.
Codec() *amino.Codec
// Context returns the connection's context.
Context() context.Context
}
// Context is the first parameter for all functions. It carries a json-rpc
// request, http request and websocket connection.
//
// - JSONReq is non-nil when JSONRPC is called over websocket or HTTP.
// - WSConn is non-nil when we're connected via a websocket.
// - HTTPReq is non-nil when URI or JSONRPC is called over HTTP.
type Context struct {
// json-rpc request
JSONReq *RPCRequest
// websocket connection
WSConn WSRPCConnection
// http request
HTTPReq *http.Request
}
// RemoteAddr returns the remote address (usually a string "IP:port").
// If neither HTTPReq nor WSConn is set, an empty string is returned.
// HTTP:
// http.Request#RemoteAddr
// WS:
// result of GetRemoteAddr
func (ctx *Context) RemoteAddr() string {
if ctx.HTTPReq != nil {
return ctx.HTTPReq.RemoteAddr
} else if ctx.WSConn != nil {
return ctx.WSConn.GetRemoteAddr()
}
return ""
}
// Context returns the request's context.
// The returned context is always non-nil; it defaults to the background context.
// HTTP:
// The context is canceled when the client's connection closes, the request
// is canceled (with HTTP/2), or when the ServeHTTP method returns.
// WS:
// The context is canceled when the client's connections closes.
func (ctx *Context) Context() context.Context {
if ctx.HTTPReq != nil {
return ctx.HTTPReq.Context()
} else if ctx.WSConn != nil {
return ctx.WSConn.Context()
}
return context.Background()
}
//----------------------------------------
// SOCKETS
//
// Determine if its a unix or tcp socket.
// If tcp, must specify the port; `0.0.0.0` will return incorrectly as "unix" since there's no port
// TODO: deprecate
func SocketType(listenAddr string) string {
socketType := "unix"
if len(strings.Split(listenAddr, ":")) >= 2 {
socketType = "tcp"
}
return socketType
}