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62 lines
2.2 KiB
Go
62 lines
2.2 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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// The plugin package exposes functions and helpers for communicating to
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// plugins which are implemented as standalone binary applications.
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//
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// plugin.Client fully manages the lifecycle of executing the application,
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// connecting to it, and returning the RPC client for dispensing plugins.
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//
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// plugin.Serve fully manages listeners to expose an RPC server from a binary
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// that plugin.Client can connect to.
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package plugin
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import (
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"context"
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"errors"
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"net/rpc"
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"google.golang.org/grpc"
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)
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// Plugin is the interface that is implemented to serve/connect to an
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// inteface implementation.
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type Plugin interface {
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// Server should return the RPC server compatible struct to serve
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// the methods that the Client calls over net/rpc.
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Server(*MuxBroker) (interface{}, error)
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// Client returns an interface implementation for the plugin you're
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// serving that communicates to the server end of the plugin.
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Client(*MuxBroker, *rpc.Client) (interface{}, error)
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}
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// GRPCPlugin is the interface that is implemented to serve/connect to
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// a plugin over gRPC.
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type GRPCPlugin interface {
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// GRPCServer should register this plugin for serving with the
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// given GRPCServer. Unlike Plugin.Server, this is only called once
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// since gRPC plugins serve singletons.
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GRPCServer(*GRPCBroker, *grpc.Server) error
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// GRPCClient should return the interface implementation for the plugin
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// you're serving via gRPC. The provided context will be canceled by
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// go-plugin in the event of the plugin process exiting.
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GRPCClient(context.Context, *GRPCBroker, *grpc.ClientConn) (interface{}, error)
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}
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// NetRPCUnsupportedPlugin implements Plugin but returns errors for the
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// Server and Client functions. This will effectively disable support for
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// net/rpc based plugins.
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//
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// This struct can be embedded in your struct.
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type NetRPCUnsupportedPlugin struct{}
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func (p NetRPCUnsupportedPlugin) Server(*MuxBroker) (interface{}, error) {
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return nil, errors.New("net/rpc plugin protocol not supported")
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}
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func (p NetRPCUnsupportedPlugin) Client(*MuxBroker, *rpc.Client) (interface{}, error) {
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return nil, errors.New("net/rpc plugin protocol not supported")
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}
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