Introduce StatsAPI and it's initial implementation

- this implementation is basically Go wrapper around VPP's vppapiclient C library

Change-Id: I6f53dc3e228868834bf3a8a00c686ad05e22f3dd
Signed-off-by: Ondrej Fabry <ofabry@cisco.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/adapter/vpp_api.go b/adapter/vpp_api.go
new file mode 100644
index 0000000..7d14633
--- /dev/null
+++ b/adapter/vpp_api.go
@@ -0,0 +1,47 @@
+// Copyright (c) 2017 Cisco and/or its affiliates.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at:
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package adapter
+
+import (
+	"errors"
+)
+
+// ErrNotImplemented is an error returned when missing implementation.
+var ErrNotImplemented = errors.New("not implemented for this OS")
+
+// MsgCallback defines func signature for message callback.
+type MsgCallback func(msgID uint16, data []byte)
+
+// VppAPI provides connection to VPP binary API.
+// It is responsible for sending and receiving of binary-encoded messages to/from VPP.
+type VppAPI interface {
+	// Connect connects the process to VPP.
+	Connect() error
+
+	// Disconnect disconnects the process from VPP.
+	Disconnect() error
+
+	// GetMsgID returns a runtime message ID for the given message name and CRC.
+	GetMsgID(msgName string, msgCrc string) (msgID uint16, err error)
+
+	// SendMsg sends a binary-encoded message to VPP.
+	SendMsg(context uint32, data []byte) error
+
+	// SetMsgCallback sets a callback function that will be called by the adapter whenever a message comes from VPP.
+	SetMsgCallback(cb MsgCallback)
+
+	// WaitReady waits until adapter is ready.
+	WaitReady() error
+}