112 lines
3.1 KiB
Go
112 lines
3.1 KiB
Go
// Copyright 2016 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package rpc
|
|
|
|
import "encoding/json"
|
|
|
|
// NewInProcRPCClient creates an in-process buffer stream attachment to a given
|
|
// RPC server.
|
|
func NewInProcRPCClient(handler *Server) Client {
|
|
buffer := &inprocBuffer{
|
|
requests: make(chan []byte, 16),
|
|
responses: make(chan []byte, 16),
|
|
}
|
|
client := &inProcClient{
|
|
server: handler,
|
|
buffer: buffer,
|
|
}
|
|
go handler.ServeCodec(NewJSONCodec(client.buffer))
|
|
return client
|
|
}
|
|
|
|
// inProcClient is an in-process buffer stream attached to an RPC server.
|
|
type inProcClient struct {
|
|
server *Server
|
|
buffer *inprocBuffer
|
|
}
|
|
|
|
// Close tears down the request channel of the in-proc client.
|
|
func (c *inProcClient) Close() {
|
|
c.buffer.Close()
|
|
}
|
|
|
|
// Send marshals a message into a json format and injects in into the client
|
|
// request channel.
|
|
func (c *inProcClient) Send(msg interface{}) error {
|
|
d, err := json.Marshal(msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
c.buffer.requests <- d
|
|
return nil
|
|
}
|
|
|
|
// Recv reads a message from the response channel and tries to parse it into the
|
|
// given msg interface.
|
|
func (c *inProcClient) Recv(msg interface{}) error {
|
|
data := <-c.buffer.responses
|
|
return json.Unmarshal(data, &msg)
|
|
}
|
|
|
|
// Returns the collection of modules the RPC server offers.
|
|
func (c *inProcClient) SupportedModules() (map[string]string, error) {
|
|
return SupportedModules(c)
|
|
}
|
|
|
|
// inprocBuffer represents the connection between the RPC server and console
|
|
type inprocBuffer struct {
|
|
readBuf []byte // store remaining request bytes after a partial read
|
|
requests chan []byte // list with raw serialized requests
|
|
responses chan []byte // list with raw serialized responses
|
|
}
|
|
|
|
// Read will read the next request in json format.
|
|
func (b *inprocBuffer) Read(p []byte) (int, error) {
|
|
// last read didn't read entire request, return remaining bytes
|
|
if len(b.readBuf) > 0 {
|
|
n := copy(p, b.readBuf)
|
|
if n < len(b.readBuf) {
|
|
b.readBuf = b.readBuf[:n]
|
|
} else {
|
|
b.readBuf = b.readBuf[:0]
|
|
}
|
|
return n, nil
|
|
}
|
|
// read next request
|
|
req := <-b.requests
|
|
n := copy(p, req)
|
|
if n < len(req) {
|
|
// inprocBuffer too small, store remaining chunk for next read
|
|
b.readBuf = req[n:]
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
// Write sends the given buffer to the backend.
|
|
func (b *inprocBuffer) Write(p []byte) (n int, err error) {
|
|
b.responses <- p
|
|
return len(p), nil
|
|
}
|
|
|
|
// Close cleans up obtained resources.
|
|
func (b *inprocBuffer) Close() error {
|
|
close(b.requests)
|
|
close(b.responses)
|
|
|
|
return nil
|
|
}
|