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package gopher
import (
"context"
"errors"
"fmt"
"io"
"net"
"tildegit.org/tjp/sliderule/internal/types"
"tildegit.org/tjp/sliderule/internal"
"tildegit.org/tjp/sliderule/logging"
)
type gopherServer struct {
internal.Server
handler types.Handler
}
func (gs gopherServer) Protocol() string { return "GOPHER" }
// NewServer builds a gopher server.
func NewServer(
ctx context.Context,
hostname string,
network string,
address string,
handler types.Handler,
baseLog logging.Logger,
) (types.Server, error) {
gs := &gopherServer{handler: handler}
hostname = internal.JoinDefaultPort(hostname, "70")
address = internal.JoinDefaultPort(address, "70")
var err error
gs.Server, err = internal.NewServer(ctx, hostname, network, address, baseLog, gs.handleConn)
if err != nil {
return nil, err
}
return gs, nil
}
func (gs *gopherServer) handleConn(conn net.Conn) {
var response *types.Response
request, err := ParseRequest(conn)
if err != nil {
response = Error(errors.New("Malformed request.")).Response()
} else {
request.Server = gs
request.RemoteAddr = conn.RemoteAddr()
request.Host = gs.Host
defer func() {
if r := recover(); r != nil {
err := fmt.Errorf("%s", r)
_ = gs.LogError("msg", "panic in handler", "err", err)
rdr := NewResponseReader(Error(errors.New("Server error.")).Response())
_, _ = io.Copy(conn, rdr)
}
}()
response = gs.handler.Handle(gs.Ctx, request)
if response == nil {
response = Error(errors.New("Resource does not exist.")).Response()
}
}
defer response.Close()
_, _ = io.Copy(conn, NewResponseReader(response))
}
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