147 lines
3.7 KiB
Go
147 lines
3.7 KiB
Go
//Package rpc provides abstract rpc server
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//
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//Copyright (C) 2022 Alexander Kiryukhin <i@neonxp.dev>
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//
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//This file is part of go.neonxp.dev/jsonrpc2 project.
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//
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//This program is free software: you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation, either version 3 of the License, or
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//(at your option) any later version.
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//
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//
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//You should have received a copy of the GNU General Public License
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//along with this program. If not, see <https://www.gnu.org/licenses/>.
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package rpc
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import (
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"context"
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"encoding/json"
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"io"
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"sync"
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)
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const version = "2.0"
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type RpcServer struct {
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Logger Logger
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IgnoreNotifications bool
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handlers map[string]Handler
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mu sync.RWMutex
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}
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func New() *RpcServer {
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return &RpcServer{
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Logger: nopLogger{},
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IgnoreNotifications: true,
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handlers: map[string]Handler{},
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mu: sync.RWMutex{},
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}
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}
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func (r *RpcServer) Register(method string, handler Handler) {
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r.mu.Lock()
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defer r.mu.Unlock()
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r.handlers[method] = handler
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}
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func (r *RpcServer) SingleRequest(ctx context.Context, reader io.Reader, writer io.Writer) {
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req := new(rpcRequest)
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if err := json.NewDecoder(reader).Decode(req); err != nil {
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r.Logger.Logf("Can't read body: %v", err)
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WriteError(ErrCodeParseError, writer)
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return
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}
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resp := r.callMethod(ctx, req)
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if req.Id == nil && r.IgnoreNotifications {
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// notification request
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return
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}
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if err := json.NewEncoder(writer).Encode(resp); err != nil {
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r.Logger.Logf("Can't write response: %v", err)
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WriteError(ErrCodeInternalError, writer)
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return
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}
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}
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func (r *RpcServer) BatchRequest(ctx context.Context, reader io.Reader, writer io.Writer) {
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var req []rpcRequest
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if err := json.NewDecoder(reader).Decode(&req); err != nil {
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r.Logger.Logf("Can't read body: %v", err)
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WriteError(ErrCodeParseError, writer)
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return
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}
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var responses []*rpcResponse
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wg := sync.WaitGroup{}
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wg.Add(len(req))
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for _, j := range req {
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go func(req rpcRequest) {
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defer wg.Done()
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resp := r.callMethod(ctx, &req)
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if req.Id == nil && r.IgnoreNotifications {
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// notification request
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return
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}
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responses = append(responses, resp)
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}(j)
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}
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wg.Wait()
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if err := json.NewEncoder(writer).Encode(responses); err != nil {
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r.Logger.Logf("Can't write response: %v", err)
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WriteError(ErrCodeInternalError, writer)
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}
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}
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func (r *RpcServer) callMethod(ctx context.Context, req *rpcRequest) *rpcResponse {
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r.mu.RLock()
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h, ok := r.handlers[req.Method]
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r.mu.RUnlock()
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if !ok {
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return &rpcResponse{
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Jsonrpc: version,
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Error: NewError(ErrCodeMethodNotFound),
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Id: req.Id,
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}
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}
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resp, err := h(ctx, req.Params)
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if err != nil {
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r.Logger.Logf("User error %v", err)
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return &rpcResponse{
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Jsonrpc: version,
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Error: err,
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Id: req.Id,
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}
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}
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return &rpcResponse{
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Jsonrpc: version,
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Result: resp,
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Id: req.Id,
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}
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}
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func WriteError(code int, w io.Writer) {
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_ = json.NewEncoder(w).Encode(rpcResponse{
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Jsonrpc: version,
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Error: NewError(code),
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})
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}
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type rpcRequest struct {
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Jsonrpc string `json:"jsonrpc"`
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Method string `json:"method"`
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Params json.RawMessage `json:"params"`
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Id any `json:"id"`
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}
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type rpcResponse struct {
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Jsonrpc string `json:"jsonrpc"`
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Result json.RawMessage `json:"result,omitempty"`
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Error error `json:"error,omitempty"`
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Id any `json:"id,omitempty"`
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}
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