TUN-528: Move cloudflared into a separate repo

vendor/zombiezen.com/go/capnproto2/rpc/log.go

@@ -0,0 +1,49 @@
+package rpc
+
+import (
+	"log"
+
+	"golang.org/x/net/context"
+)
+
+// A Logger records diagnostic information and errors that are not
+// associated with a call.  The arguments passed into a log call are
+// interpreted like fmt.Printf.  They should not be held onto past the
+// call's return.
+type Logger interface {
+	Infof(ctx context.Context, format string, args ...interface{})
+	Errorf(ctx context.Context, format string, args ...interface{})
+}
+
+type defaultLogger struct{}
+
+func (defaultLogger) Infof(ctx context.Context, format string, args ...interface{}) {
+	log.Printf("rpc: "+format, args...)
+}
+
+func (defaultLogger) Errorf(ctx context.Context, format string, args ...interface{}) {
+	log.Printf("rpc: "+format, args...)
+}
+
+func (c *Conn) infof(format string, args ...interface{}) {
+	if c.log == nil {
+		return
+	}
+	c.log.Infof(c.bg, format, args...)
+}
+
+func (c *Conn) errorf(format string, args ...interface{}) {
+	if c.log == nil {
+		return
+	}
+	c.log.Errorf(c.bg, format, args...)
+}
+
+// ConnLog sets the connection's log to the given Logger, which may be
+// nil to disable logging.  By default, logs are sent to the standard
+// log package.
+func ConnLog(log Logger) ConnOption {
+	return ConnOption{func(c *connParams) {
+		c.log = log
+	}}
+}