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