ipld-eth-server/pkg/rpc/ipc.go

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// VulcanizeDB
// Copyright © 2020 Vulcanize
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program 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 Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package rpc
import (
"fmt"
"net"
"os"
"path/filepath"
"github.com/cerc-io/ipld-eth-server/v4/pkg/log"
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"github.com/ethereum/go-ethereum/p2p/netutil"
"github.com/ethereum/go-ethereum/rpc"
"github.com/cerc-io/ipld-eth-server/v4/pkg/prom"
)
var (
// On Linux, sun_path is 108 bytes in size
// see http://man7.org/linux/man-pages/man7/unix.7.html
maxPathSize = 108
)
// ipcListen will create a Unix socket on the given endpoint.
func ipcListen(endpoint string) (net.Listener, error) {
if len(endpoint) > int(maxPathSize) {
log.Warn(fmt.Sprintf("The ipc endpoint is longer than %d characters. ", maxPathSize),
"endpoint", endpoint)
}
// Ensure the IPC path exists and remove any previous leftover
if err := os.MkdirAll(filepath.Dir(endpoint), 0751); err != nil {
return nil, err
}
os.Remove(endpoint)
l, err := net.Listen("unix", endpoint)
if err != nil {
return nil, err
}
os.Chmod(endpoint, 0600)
return l, nil
}
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func ipcServe(srv *rpc.Server, listener net.Listener) {
for {
conn, err := listener.Accept()
if netutil.IsTemporaryError(err) {
log.WithError(err).Warn("rpc accept error")
continue
}
if err != nil {
log.WithError(err).Warn("unknown error")
continue
}
log.WithField("addr", conn.RemoteAddr()).Trace("accepted ipc connection")
go prom.IPCMiddleware(srv, conn)
}
}
// StartIPCEndpoint starts an IPC endpoint.
func StartIPCEndpoint(ipcEndpoint string, apis []rpc.API) (net.Listener, *rpc.Server, error) {
// Register all the APIs exposed by the services.
handler := rpc.NewServer()
for _, api := range apis {
if err := handler.RegisterName(api.Namespace, api.Service); err != nil {
return nil, nil, err
}
log.Debug("IPC registered", "namespace", api.Namespace)
}
// All APIs registered, start the IPC listener.
listener, err := ipcListen(ipcEndpoint)
if err != nil {
return nil, nil, err
}
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go ipcServe(handler, listener)
return listener, handler, nil
}