package ipc
import (
"bufio"
"context"
"errors"
"net"
"os"
"sync/atomic"
"time"
"git.sr.ht/~rjarry/aerc/lib/log"
"git.sr.ht/~rjarry/aerc/lib/xdg"
)
type AercServer struct {
listener net.Listener
handler Handler
startup context.Context
}
func StartServer(handler Handler, startup context.Context) (*AercServer, error) {
sockpath := xdg.RuntimePath("aerc.sock")
// remove the socket if it is not connected to a session
if _, err := ConnectAndExec(nil); err != nil {
os.Remove(sockpath)
}
log.Debugf("Starting Unix server: %s", sockpath)
l, err := net.Listen("unix", sockpath)
if err != nil {
return nil, err
}
as := &AercServer{listener: l, handler: handler, startup: startup}
go as.Serve()
return as, nil
}
func (as *AercServer) Close() {
as.listener.Close()
}
var lastId int64 = 0 // access via atomic
func (as *AercServer) Serve() {
defer log.PanicHandler()
<-as.startup.Done()
for {
conn, err := as.listener.Accept()
switch {
case errors.Is(err, net.ErrClosed):
log.Infof("shutting down UNIX listener")
return
case err != nil:
log.Errorf("ipc: accepting connection failed: %v", err)
continue
}
defer conn.Close()
clientId := atomic.AddInt64(&lastId, 1)
log.Debugf("unix:%d accepted connection", clientId)
scanner := bufio.NewScanner(conn)
err = conn.SetDeadline(time.Now().Add(1 * time.Minute))
if err != nil {
log.Errorf("unix:%d failed to set deadline: %v", clientId, err)
}
for scanner.Scan() {
// allow up to 1 minute between commands
err = conn.SetDeadline(time.Now().Add(1 * time.Minute))
if err != nil {
log.Errorf("unix:%d failed to update deadline: %v", clientId, err)
}
msg, err := DecodeRequest(scanner.Bytes())
log.Tracef("unix:%d got message %s", clientId, scanner.Text())
if err != nil {
log.Errorf("unix:%d failed to parse request: %v", clientId, err)
continue
}
response := as.handleMessage(msg)
result, err := response.Encode()
if err != nil {
log.Errorf("unix:%d failed to encode result: %v", clientId, err)
continue
}
_, err = conn.Write(append(result, '\n'))
if err != nil {
log.Errorf("unix:%d failed to send response: %v", clientId, err)
break
}
}
log.Tracef("unix:%d closed connection", clientId)
}
}
func (as *AercServer) handleMessage(req *Request) *Response {
err := as.handler.Command(req.Arguments)
if err != nil {
return &Response{Error: err.Error()}
}
return &Response{}
}
