package goridge
import (
"io"
"sync"
)
// SocketRelay communicates with underlying process using sockets (TPC or Unix).
type SocketRelay struct {
// How many bytes to write/read at once.
BufferSize uint64
muw sync.Mutex // concurrent write
mur sync.Mutex // concurrent read
rwc io.ReadWriteCloser
}
// NewSocketRelay creates new socket based data relay.
func NewSocketRelay(rwc io.ReadWriteCloser) *SocketRelay {
return &SocketRelay{BufferSize: BufferSize, rwc: rwc}
}
// Send signed (prefixed) data to PHP process.
func (rl *SocketRelay) Send(data []byte, flags byte) (err error) {
rl.muw.Lock()
defer rl.muw.Unlock()
prefix := NewPrefix().WithFlags(flags).WithSize(uint64(len(data)))
if _, err := rl.rwc.Write(prefix[:]); err != nil {
return err
}
if _, err := rl.rwc.Write(data); err != nil {
return err
}
return nil
}
// Receive data from the underlying process and returns associated prefix or error.
func (rl *SocketRelay) Receive() (data []byte, p Prefix, err error) {
rl.mur.Lock()
defer rl.mur.Unlock()
defer func() {
if rErr, ok := recover().(error); ok {
err = rErr
}
}()
if _, err := rl.rwc.Read(p[:]); err != nil {
return nil, p, err
}
if !p.HasPayload() {
return nil, p, nil
}
leftBytes := p.Size()
data = make([]byte, 0, leftBytes)
buffer := make([]byte, min(leftBytes, rl.BufferSize))
for {
if n, err := rl.rwc.Read(buffer); err == nil {
data = append(data, buffer[:n]...)
leftBytes -= uint64(n)
} else {
return nil, p, err
}
if leftBytes == 0 {
break
}
}
return
}
// Close the connection.
func (rl *SocketRelay) Close() error {
rl.muw.Lock()
rl.mur.Lock()
defer rl.muw.Unlock()
defer rl.mur.Unlock()
return rl.rwc.Close()
}
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