--- /dev/null
+// Copyright (c) 2020 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 api
+
+import (
+ "context"
+ "time"
+)
+
+// Connection represents the client connection to VPP API.
+//
+// NOTE: This API is EXPERIMENTAL.
+type Connection interface {
+ // NewStream creates a new stream for sending and receiving messages.
+ // Context can be used to close the stream using cancel or timeout.
+ NewStream(ctx context.Context) (Stream, error)
+
+ // Invoke can be used for a simple request-reply RPC.
+ // It creates stream and calls SendMsg with req and RecvMsg with reply.
+ Invoke(ctx context.Context, req Message, reply Message) error
+}
+
+// Stream provides low-level access for sending and receiving messages.
+// Users should handle correct type and ordering of messages.
+//
+// NOTE: This API is EXPERIMENTAL.
+type Stream interface {
+ // SendMsg sends a message to the client.
+ // It blocks until message is sent to the transport.
+ //
+ // It is safe to have a goroutine calling SendMsg and another goroutine
+ // calling RecvMsg on the same stream at the same time, but it is not safe
+ // to call SendMsg on the same stream in different goroutines.
+ SendMsg(Message) error
+
+ // RecvMsg blocks until a message is received or error occurs.
+ //
+ // It is safe to have a goroutine calling SendMsg and another goroutine
+ // calling RecvMsg on the same stream at the same time, but it is not safe
+ // to call SendMsg on the same stream in different goroutines.
+ RecvMsg() (Message, error)
+
+ // Close closes the stream. Calling SendMsg and RecvMsg will return error
+ // after closing stream.
+ Close() error
+}
+
+// ChannelProvider provides the communication channel with govpp core.
+type ChannelProvider interface {
+ // NewAPIChannel returns a new channel for communication with VPP via govpp core.
+ // It uses default buffer sizes for the request and reply Go channels.
+ NewAPIChannel() (Channel, error)
+
+ // NewAPIChannelBuffered returns a new channel for communication with VPP via govpp core.
+ // It allows to specify custom buffer sizes for the request and reply Go channels.
+ NewAPIChannelBuffered(reqChanBufSize, replyChanBufSize int) (Channel, error)
+}
+
+// Channel provides methods for direct communication with VPP channel.
+type Channel interface {
+ // SendRequest asynchronously sends a request to VPP. Returns a request context, that can be used to call ReceiveReply.
+ // In case of any errors by sending, the error will be delivered to ReplyChan (and returned by ReceiveReply).
+ SendRequest(msg Message) RequestCtx
+
+ // SendMultiRequest asynchronously sends a multipart request (request to which multiple responses are expected) to VPP.
+ // Returns a multipart request context, that can be used to call ReceiveReply.
+ // In case of any errors by sending, the error will be delivered to ReplyChan (and returned by ReceiveReply).
+ SendMultiRequest(msg Message) MultiRequestCtx
+
+ // SubscribeNotification subscribes for receiving of the specified notification messages via provided Go channel.
+ // Note that the caller is responsible for creating the Go channel with preferred buffer size. If the channel's
+ // buffer is full, the notifications will not be delivered into it.
+ SubscribeNotification(notifChan chan Message, event Message) (SubscriptionCtx, error)
+
+ // SetReplyTimeout sets the timeout for replies from VPP. It represents the maximum time the API waits for a reply
+ // from VPP before returning an error.
+ SetReplyTimeout(timeout time.Duration)
+
+ // CheckCompatibility checks the compatiblity for the given messages.
+ // It will return an error if any of the given messages are not compatible.
+ CheckCompatiblity(msgs ...Message) error
+
+ // Close closes the API channel and releases all API channel-related resources
+ // in the ChannelProvider.
+ Close()
+}
+
+// RequestCtx is helper interface which allows to receive reply on request.
+type RequestCtx interface {
+ // ReceiveReply receives a reply from VPP (blocks until a reply is delivered
+ // from VPP, or until an error occurs). The reply will be decoded into the msg
+ // argument. Error will be returned if the response cannot be received or decoded.
+ ReceiveReply(msg Message) error
+}
+
+// MultiRequestCtx is helper interface which allows to receive reply on multi-request.
+type MultiRequestCtx interface {
+ // ReceiveReply receives a reply from VPP (blocks until a reply is delivered
+ // from VPP, or until an error occurs).The reply will be decoded into the msg
+ // argument. If the last reply has been already consumed, lastReplyReceived is
+ // set to true. Do not use the message itself if lastReplyReceived is
+ // true - it won't be filled with actual data.Error will be returned if the
+ // response cannot be received or decoded.
+ ReceiveReply(msg Message) (lastReplyReceived bool, err error)
+}
+
+// SubscriptionCtx is helper interface which allows to control subscription for
+// notification events.
+type SubscriptionCtx interface {
+ // Unsubscribe unsubscribes from receiving the notifications tied to the
+ // subscription context.
+ Unsubscribe() error
+}
Code Review / govpp.git / blobdiff