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package main
import (
"context"
"encoding/binary"
"errors"
"io"
"log"
"net"
"os"
"sync"
"testing"
"time"
"hakurei.app/check"
"hakurei.app/internal/pkg"
)
// daemonTimeout is the maximum amount of time cureFromIR will wait on I/O.
const daemonTimeout = 30 * time.Second
// daemonDeadline returns the deadline corresponding to daemonTimeout, or the
// zero value when running in a test.
func daemonDeadline() time.Time {
if testing.Testing() {
return time.Time{}
}
return time.Now().Add(daemonTimeout)
}
const (
// remoteNoReply notifies that the client will not receive a cure reply.
remoteNoReply = 1 << iota
)
// cureFromIR services an IR curing request.
func cureFromIR(
cache *pkg.Cache,
conn net.Conn,
flags uint64,
) (pkg.Artifact, error) {
a, decodeErr := cache.NewDecoder(conn).Decode()
if decodeErr != nil {
_, err := conn.Write([]byte("\x00" + decodeErr.Error()))
return nil, errors.Join(decodeErr, err, conn.Close())
}
pathname, _, cureErr := cache.Cure(a)
if flags&remoteNoReply != 0 {
return a, errors.Join(cureErr, conn.Close())
}
if err := conn.SetWriteDeadline(daemonDeadline()); err != nil {
return a, errors.Join(cureErr, err, conn.Close())
}
if cureErr != nil {
_, err := conn.Write([]byte("\x00" + cureErr.Error()))
return a, errors.Join(cureErr, err, conn.Close())
}
_, err := conn.Write([]byte(pathname.String()))
if testing.Testing() && errors.Is(err, io.ErrClosedPipe) {
return a, nil
}
return a, errors.Join(err, conn.Close())
}
// serve services connections from a [net.UnixListener].
func serve(
ctx context.Context,
log *log.Logger,
cm *cache,
ul *net.UnixListener,
) error {
ul.SetUnlinkOnClose(true)
if cm.c == nil {
if err := cm.open(); err != nil {
return errors.Join(err, ul.Close())
}
}
var wg sync.WaitGroup
defer wg.Wait()
wg.Go(func() {
for {
if ctx.Err() != nil {
break
}
conn, err := ul.AcceptUnix()
if err != nil {
if !errors.Is(err, os.ErrDeadlineExceeded) {
log.Println(err)
}
continue
}
wg.Go(func() {
go func() { <-ctx.Done(); _ = conn.SetDeadline(time.Now()) }()
if _err := conn.SetReadDeadline(daemonDeadline()); _err != nil {
log.Println(_err)
if _err = conn.Close(); _err != nil {
log.Println(_err)
}
return
}
var flagsWire [8]byte
if _, _err := io.ReadFull(conn, flagsWire[:]); _err != nil {
log.Println(_err)
if _err = conn.Close(); _err != nil {
log.Println(_err)
}
return
}
flags := binary.LittleEndian.Uint64(flagsWire[:])
if a, _err := cureFromIR(cm.c, conn, flags); _err != nil {
log.Println(_err)
} else {
log.Printf(
"fulfilled artifact %s",
pkg.Encode(cm.c.Ident(a).Value()),
)
}
})
}
})
<-ctx.Done()
if err := ul.SetDeadline(time.Now()); err != nil {
return errors.Join(err, ul.Close())
}
wg.Wait()
return ul.Close()
}
// cureRemote cures a [pkg.Artifact] on a daemon.
func cureRemote(
ctx context.Context,
addr *net.UnixAddr,
a pkg.Artifact,
flags uint64,
) (*check.Absolute, error) {
conn, err := net.DialUnix("unix", nil, addr)
if err != nil {
return nil, err
}
go func() { <-ctx.Done(); _ = conn.SetDeadline(time.Now()) }()
if n, flagErr := conn.Write(binary.LittleEndian.AppendUint64(nil, flags)); flagErr != nil {
return nil, errors.Join(flagErr, conn.Close())
} else if n != 8 {
return nil, errors.Join(io.ErrShortWrite, conn.Close())
}
if err = pkg.NewIR().EncodeAll(conn, a); err != nil {
return nil, errors.Join(err, conn.Close())
} else if err = conn.CloseWrite(); err != nil {
return nil, errors.Join(err, conn.Close())
}
if flags&remoteNoReply != 0 {
return nil, conn.Close()
}
payload, recvErr := io.ReadAll(conn)
if err = errors.Join(recvErr, conn.Close()); err != nil {
if errors.Is(err, os.ErrDeadlineExceeded) {
err = ctx.Err()
}
return nil, err
}
if len(payload) > 0 && payload[0] == 0 {
return nil, errors.New(string(payload[1:]))
}
var p *check.Absolute
p, err = check.NewAbs(string(payload))
return p, err
}
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