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package server
import (
"context"
"fmt"
"log/slog"
"net"
"sync"
"time"
"github.com/jpappel/atlas/pkg/data"
"github.com/jpappel/atlas/pkg/index"
"github.com/jpappel/atlas/pkg/query"
)
const (
START_HEADER byte = 1
START_BODY byte = 2
END_BODY byte = 3
END_MSG byte = 4
END_QUERY byte = 5
)
type UnixServer struct {
Addr string
Db *data.Query
WorkersPerConn uint
ln *net.UnixListener
conns map[uint64]*net.UnixConn
lock sync.RWMutex
bufPool sync.Pool
}
func (s *UnixServer) ListenAndServe() error {
addr, err := net.ResolveUnixAddr("unix", s.Addr)
if err != nil {
return err
}
s.ln, err = net.ListenUnix("unix", addr)
if err != nil {
return err
}
s.conns = make(map[uint64]*net.UnixConn)
s.bufPool.New = func() any {
return make([]byte, 1024)
}
var connId uint64
for {
conn, err := s.ln.AcceptUnix()
if err != nil {
break
}
connId++
slog.Info("New connection", slog.Uint64("connId", connId))
s.lock.Lock()
s.conns[connId] = conn
s.lock.Unlock()
go s.handleConn(conn, connId)
}
return nil
}
func (s *UnixServer) writeError(conn *net.UnixConn, msg string) {
conn.Write(fmt.Append([]byte{START_HEADER}, "Error handling query"))
conn.Write([]byte{START_BODY, END_BODY})
conn.Write([]byte(msg))
conn.Write([]byte{END_MSG})
}
func (s *UnixServer) writeResults(conn *net.UnixConn, docs map[string]*index.Document) {
defer conn.Write([]byte{END_MSG})
conn.Write(fmt.Appendf([]byte{START_HEADER}, "Num Docs: %d", len(docs)))
conn.Write([]byte{START_BODY})
defer conn.Write([]byte{END_BODY})
o := query.DefaultOutput{}
for _, doc := range docs {
if _, err := o.WriteDoc(conn, doc); err != nil {
slog.Error("Failed to write doc",
slog.String("err", err.Error()),
)
break
}
}
}
func (s *UnixServer) handleConn(conn *net.UnixConn, id uint64) {
defer func(id uint64) {
s.lock.Lock()
delete(s.conns, id)
s.lock.Unlock()
}(id)
buf := s.bufPool.Get().([]byte)
defer s.bufPool.Put(buf)
defer slog.Info("Closing connection",
slog.String("local", conn.LocalAddr().String()),
)
for {
slog.Debug("Waiting for query")
n, err := conn.Read(buf)
if n == 0 || err != nil {
break
}
buf = buf[:n]
if buf[len(buf)-1] != 5 {
slog.Info("Missing ENQ at end of message")
break
}
queryTxt := string(buf[:len(buf)-1])
slog.Debug("Recieved query",
slog.String("query", queryTxt),
)
// TODO: cache compilation artifacts
artifact, err := query.Compile(queryTxt, 0, s.WorkersPerConn)
if err != nil {
slog.Warn("Failed to compile query",
slog.String("err", err.Error()))
s.writeError(conn, "query compilation error")
break
}
ctx, cancel := context.WithTimeout(context.Background(), 400*time.Millisecond)
docs, err := s.Db.Execute(ctx, artifact)
if err != nil {
slog.Warn("Failed to execute query",
slog.String("query", queryTxt),
slog.String("err", err.Error()),
)
s.writeError(conn, "query execution error")
cancel()
break
}
cancel()
slog.Debug("Sending results")
s.writeResults(conn, docs)
}
}
func (s *UnixServer) Shutdown(ctx context.Context) error {
s.ln.Close()
s.lock.RLock()
defer s.lock.RUnlock()
for _, conn := range s.conns {
conn.Write([]byte("Closing Server"))
conn.Close()
}
return nil
}
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