mirror of https://github.com/poanetwork/quorum.git
112 lines
3.1 KiB
Go
112 lines
3.1 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser 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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// The go-ethereum library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rpc
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import "encoding/json"
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// NewInProcRPCClient creates an in-process buffer stream attachment to a given
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// RPC server.
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func NewInProcRPCClient(handler *Server) Client {
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buffer := &inprocBuffer{
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requests: make(chan []byte, 16),
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responses: make(chan []byte, 16),
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}
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client := &inProcClient{
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server: handler,
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buffer: buffer,
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}
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go handler.ServeCodec(NewJSONCodec(client.buffer))
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return client
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}
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// inProcClient is an in-process buffer stream attached to an RPC server.
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type inProcClient struct {
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server *Server
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buffer *inprocBuffer
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}
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// Close tears down the request channel of the in-proc client.
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func (c *inProcClient) Close() {
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c.buffer.Close()
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}
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// Send marshals a message into a json format and injects in into the client
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// request channel.
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func (c *inProcClient) Send(msg interface{}) error {
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d, err := json.Marshal(msg)
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if err != nil {
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return err
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}
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c.buffer.requests <- d
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return nil
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}
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// Recv reads a message from the response channel and tries to parse it into the
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// given msg interface.
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func (c *inProcClient) Recv(msg interface{}) error {
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data := <-c.buffer.responses
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return json.Unmarshal(data, &msg)
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}
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// Returns the collection of modules the RPC server offers.
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func (c *inProcClient) SupportedModules() (map[string]string, error) {
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return SupportedModules(c)
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}
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// inprocBuffer represents the connection between the RPC server and console
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type inprocBuffer struct {
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readBuf []byte // store remaining request bytes after a partial read
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requests chan []byte // list with raw serialized requests
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responses chan []byte // list with raw serialized responses
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}
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// Read will read the next request in json format.
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func (b *inprocBuffer) Read(p []byte) (int, error) {
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// last read didn't read entire request, return remaining bytes
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if len(b.readBuf) > 0 {
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n := copy(p, b.readBuf)
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if n < len(b.readBuf) {
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b.readBuf = b.readBuf[:n]
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} else {
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b.readBuf = b.readBuf[:0]
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}
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return n, nil
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}
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// read next request
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req := <-b.requests
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n := copy(p, req)
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if n < len(req) {
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// inprocBuffer too small, store remaining chunk for next read
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b.readBuf = req[n:]
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}
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return n, nil
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}
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// Write sends the given buffer to the backend.
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func (b *inprocBuffer) Write(p []byte) (n int, err error) {
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b.responses <- p
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return len(p), nil
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}
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// Close cleans up obtained resources.
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func (b *inprocBuffer) Close() error {
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close(b.requests)
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close(b.responses)
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return nil
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}
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