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package server
import (
"bytes"
"context"
"log/slog"
"net"
"os"
"github.com/jpappel/atlas/pkg/data"
"github.com/jpappel/atlas/pkg/query"
)
// datagram based unix server
type UnixServer struct {
Addr string
Db *data.Query
conn *net.UnixConn
}
func (s *UnixServer) ListenAndServe() error {
serverAddr := s.Addr + "_server.sock"
clientAddr := s.Addr + "_client.sock"
var err error
s.conn, err = net.ListenUnixgram(
"unixgram",
&net.UnixAddr{Name: serverAddr, Net: "Unix"},
)
if err != nil {
return err
}
defer os.RemoveAll(s.Addr)
slog.Info("Listening on", slog.String("addr", s.Addr))
var remote *net.UnixAddr
remote, err = net.ResolveUnixAddr("unixgram", clientAddr)
if err != nil {
panic(err)
}
// FIXME: limits queries to 1kb, might have some data overflow into next msg
buf := make([]byte, 1024)
for {
n, _, err := s.conn.ReadFromUnix(buf)
if err != nil {
return err
}
buf = buf[:n]
queryTxt := string(buf)
slog.Debug("New message",
slog.String("msg", queryTxt),
slog.String("local", s.conn.LocalAddr().String()),
slog.String("remote", remote.String()),
)
// TODO: set reasonable numWorkers
// TODO: rwrite error to remote
artifact, err := query.Compile(queryTxt, 0, 2)
if err != nil {
slog.Error("Failed to compile query", slog.String("err", err.Error()))
return err
}
// TODO: write error to remote
docs, err := s.Db.Execute(artifact)
if err != nil {
slog.Error("Failed to execute query",
slog.String("err", err.Error()))
return err
}
buf := &bytes.Buffer{}
o := query.DefaultOutput{}
for _, doc := range docs {
n, err = o.WriteDoc(buf, doc)
if err != nil {
return err
}
b := buf.Bytes()
remaining := len(b)
offset := 0
for remaining > 0 {
n, err := s.conn.WriteToUnix(b[offset:remaining], remote)
if err != nil {
return err
}
remaining -= n
offset += n
}
buf.Reset()
}
// EOF
s.conn.WriteToUnix([]byte{4}, remote)
}
}
func (s *UnixServer) Shutdown(ctx context.Context) error {
return s.conn.Close()
}
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