mirror of https://github.com/poanetwork/quorum.git
175 lines
4.7 KiB
Go
175 lines
4.7 KiB
Go
// Copyright 2015 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 utils
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import (
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"encoding/json"
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"fmt"
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"strings"
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"github.com/codegangsta/cli"
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"github.com/ethereum/go-ethereum/eth"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/node"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// NewInProcRPCClient will start a new RPC server for the given node and returns a client to interact with it.
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func NewInProcRPCClient(stack *node.Node) *inProcClient {
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server := rpc.NewServer()
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offered := stack.APIs()
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for _, api := range offered {
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server.RegisterName(api.Namespace, api.Service)
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}
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web3 := node.NewPublicWeb3API(stack)
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server.RegisterName("web3", web3)
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var ethereum *eth.Ethereum
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if err := stack.Service(ðereum); err == nil {
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net := eth.NewPublicNetAPI(stack.Server(), ethereum.NetVersion())
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server.RegisterName("net", net)
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} else {
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glog.V(logger.Warn).Infof("%v\n", err)
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}
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buf := &buf{
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requests: make(chan []byte),
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responses: make(chan []byte),
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}
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client := &inProcClient{
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server: server,
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buf: buf,
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}
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go func() {
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server.ServeCodec(rpc.NewJSONCodec(client.buf))
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}()
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return client
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}
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// buf represents the connection between the RPC server and console
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type buf 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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// will read the next request in json format
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func (b *buf) 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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// buf 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 send the given buffer to the backend
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func (b *buf) 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 *buf) 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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// inProcClient starts a RPC server and uses buf to communicate with it.
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type inProcClient struct {
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server *rpc.Server
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buf *buf
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}
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// Close will stop the RPC server
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func (c *inProcClient) Close() {
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c.server.Stop()
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}
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// Send a msg to the endpoint
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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.buf.requests <- d
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return nil
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}
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// Recv reads a message and tries to parse it into the given msg
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func (c *inProcClient) Recv(msg interface{}) error {
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data := <-c.buf.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 rpc.SupportedModules(c)
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}
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// NewRemoteRPCClient returns a RPC client which connects to a running geth instance.
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// Depending on the given context this can either be a IPC or a HTTP client.
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func NewRemoteRPCClient(ctx *cli.Context) (rpc.Client, error) {
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if ctx.Args().Present() {
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endpoint := ctx.Args().First()
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return NewRemoteRPCClientFromString(endpoint)
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}
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// use IPC by default
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return rpc.NewIPCClient(node.DefaultIpcEndpoint())
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}
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// NewRemoteRPCClientFromString returns a RPC client which connects to the given
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// endpoint. It must start with either `ipc:` or `rpc:` (HTTP).
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func NewRemoteRPCClientFromString(endpoint string) (rpc.Client, error) {
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if strings.HasPrefix(endpoint, "ipc:") {
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return rpc.NewIPCClient(endpoint[4:])
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}
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if strings.HasPrefix(endpoint, "rpc:") {
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return rpc.NewHTTPClient(endpoint[4:])
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}
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if strings.HasPrefix(endpoint, "http://") {
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return rpc.NewHTTPClient(endpoint)
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}
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if strings.HasPrefix(endpoint, "ws:") {
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return rpc.NewWSClient(endpoint)
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}
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return nil, fmt.Errorf("invalid endpoint")
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}
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