b1a71d5f83
This change takes advantage of the RawMessage type in the encoding/json package to defer unmarshaling of all JSON-RPC values until absolutely necessary. This is particularly important for request passthrough when btcwallet must ask btcd to handle a chain request for a wallet client. In the previous code, during the marshal and unmarshal dance to set the original client's request id in the btcd response, large JSON numbers were being mangled to use (scientific) E notation even when they could be represented as a integer without any loss of precision.
94 lines
2.8 KiB
Go
94 lines
2.8 KiB
Go
/*
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* Copyright (c) 2013, 2014 Conformal Systems LLC <info@conformal.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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package main
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import (
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"encoding/json"
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"github.com/conformal/btcjson"
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)
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// RawRPCResponse is a response to a JSON-RPC request with delayed
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// unmarshaling.
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type RawRPCResponse struct {
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Id *uint64
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Result *json.RawMessage `json:"result"`
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Error *json.RawMessage `json:"error"`
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}
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func (r *RawRPCResponse) FinishUnmarshal(v interface{}) (interface{}, *btcjson.Error) {
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// JSON-RPC spec makes this handling easier-ish because both result and
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// error cannot be non-nil.
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var jsonErr *btcjson.Error
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if r.Error != nil {
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if err := json.Unmarshal([]byte(*r.Error), &jsonErr); err != nil {
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return nil, &btcjson.Error{
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Code: btcjson.ErrParse.Code,
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Message: err.Error(),
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}
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}
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return nil, jsonErr
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}
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if r.Result != nil {
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if err := json.Unmarshal([]byte(*r.Result), &v); err != nil {
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return nil, &btcjson.Error{
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Code: btcjson.ErrParse.Code,
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Message: err.Error(),
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}
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}
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return v, nil
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}
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return nil, nil
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}
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// ClientRequest is a type holding a bitcoin client's request and
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// a channel to send the response.
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type ClientRequest struct {
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ws bool
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request btcjson.Cmd
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response chan RawRPCResponse
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}
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// NewClientRequest creates a new ClientRequest from a btcjson.Cmd.
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func NewClientRequest(request btcjson.Cmd, ws bool) *ClientRequest {
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return &ClientRequest{
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ws: ws,
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request: request,
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response: make(chan RawRPCResponse),
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}
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}
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// Handle sends a client request to the RPC gateway for processing,
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// and returns the result when handling is finished.
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func (r *ClientRequest) Handle() RawRPCResponse {
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clientRequests <- r
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return <-r.response
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}
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// ServerRequest is a type responsible for handling requests to a bitcoin
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// server and providing a method to access the response.
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type ServerRequest struct {
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request btcjson.Cmd
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response chan RawRPCResponse
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}
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// NewServerRequest creates a new ServerRequest from a btcjson.Cmd.
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func NewServerRequest(request btcjson.Cmd) *ServerRequest {
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return &ServerRequest{
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request: request,
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response: make(chan RawRPCResponse, 1),
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}
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}
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