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logtransport.go
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logtransport.go
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// Package logtransport provides a transport that logs all of its messages.
package logtransport
import (
"bytes"
"io"
"log"
"golang.org/x/net/context"
"github.com/iguazio/go-capnproto2/encoding/text"
"github.com/iguazio/go-capnproto2/rpc"
"github.com/iguazio/go-capnproto2/rpc/internal/logutil"
rpccapnp "github.com/iguazio/go-capnproto2/std/capnp/rpc"
)
type transport struct {
rpc.Transport
l *log.Logger
sendBuf bytes.Buffer
recvBuf bytes.Buffer
}
// New creates a new logger that proxies messages to and from t and
// logs them to l. If l is nil, then the log package's default
// logger is used.
func New(l *log.Logger, t rpc.Transport) rpc.Transport {
return &transport{Transport: t, l: l}
}
func (t *transport) SendMessage(ctx context.Context, msg rpccapnp.Message) error {
t.sendBuf.Reset()
t.sendBuf.WriteString("<- ")
formatMsg(&t.sendBuf, msg)
logutil.Print(t.l, t.sendBuf.String())
return t.Transport.SendMessage(ctx, msg)
}
func (t *transport) RecvMessage(ctx context.Context) (rpccapnp.Message, error) {
msg, err := t.Transport.RecvMessage(ctx)
if err != nil {
return msg, err
}
t.recvBuf.Reset()
t.recvBuf.WriteString("-> ")
formatMsg(&t.recvBuf, msg)
logutil.Print(t.l, t.recvBuf.String())
return msg, nil
}
func formatMsg(w io.Writer, m rpccapnp.Message) {
text.NewEncoder(w).Encode(0x91b79f1f808db032, m.Struct)
}