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|
package rpcplugin
import (
"io"
"net/rpc"
"reflect"
"github.com/mattermost/platform/plugin"
)
type LocalHooks struct {
hooks interface{}
muxer *Muxer
remoteAPI *RemoteAPI
}
// Implemented replies with the names of the hooks that are implemented.
func (h *LocalHooks) Implemented(args struct{}, reply *[]string) error {
ifaceType := reflect.TypeOf((*plugin.Hooks)(nil)).Elem()
implType := reflect.TypeOf(h.hooks)
selfType := reflect.TypeOf(h)
var methods []string
for i := 0; i < ifaceType.NumMethod(); i++ {
method := ifaceType.Method(i)
if m, ok := implType.MethodByName(method.Name); !ok {
continue
} else if m.Type.NumIn() != method.Type.NumIn()+1 {
continue
} else if m.Type.NumOut() != method.Type.NumOut() {
continue
} else {
match := true
for j := 0; j < method.Type.NumIn(); j++ {
if m.Type.In(j+1) != method.Type.In(j) {
match = false
break
}
}
for j := 0; j < method.Type.NumOut(); j++ {
if m.Type.Out(j) != method.Type.Out(j) {
match = false
break
}
}
if !match {
continue
}
}
if _, ok := selfType.MethodByName(method.Name); !ok {
continue
}
methods = append(methods, method.Name)
}
*reply = methods
return nil
}
func (h *LocalHooks) OnActivate(args int64, reply *struct{}) error {
if h.remoteAPI != nil {
h.remoteAPI.Close()
h.remoteAPI = nil
}
if hook, ok := h.hooks.(interface {
OnActivate(plugin.API) error
}); ok {
stream := h.muxer.Connect(args)
h.remoteAPI = ConnectAPI(stream, h.muxer)
return hook.OnActivate(h.remoteAPI)
}
return nil
}
func (h *LocalHooks) OnDeactivate(args, reply *struct{}) (err error) {
if hook, ok := h.hooks.(interface {
OnDeactivate() error
}); ok {
err = hook.OnDeactivate()
}
if h.remoteAPI != nil {
h.remoteAPI.Close()
h.remoteAPI = nil
}
return
}
func ServeHooks(hooks interface{}, conn io.ReadWriteCloser, muxer *Muxer) {
server := rpc.NewServer()
server.Register(&LocalHooks{
hooks: hooks,
muxer: muxer,
})
server.ServeConn(conn)
}
const (
remoteOnActivate = iota
remoteOnDeactivate
maxRemoteHookCount
)
type RemoteHooks struct {
client *rpc.Client
muxer *Muxer
apiCloser io.Closer
implemented [maxRemoteHookCount]bool
}
var _ plugin.Hooks = (*RemoteHooks)(nil)
func (h *RemoteHooks) Implemented() (impl []string, err error) {
err = h.client.Call("LocalHooks.Implemented", struct{}{}, &impl)
return
}
func (h *RemoteHooks) OnActivate(api plugin.API) error {
if h.apiCloser != nil {
h.apiCloser.Close()
h.apiCloser = nil
}
if !h.implemented[remoteOnActivate] {
return nil
}
id, stream := h.muxer.Serve()
h.apiCloser = stream
go ServeAPI(api, stream, h.muxer)
return h.client.Call("LocalHooks.OnActivate", id, nil)
}
func (h *RemoteHooks) OnDeactivate() error {
if !h.implemented[remoteOnDeactivate] {
return nil
}
return h.client.Call("LocalHooks.OnDeactivate", struct{}{}, nil)
}
func (h *RemoteHooks) Close() error {
if h.apiCloser != nil {
h.apiCloser.Close()
h.apiCloser = nil
}
return h.client.Close()
}
func ConnectHooks(conn io.ReadWriteCloser, muxer *Muxer) (*RemoteHooks, error) {
remote := &RemoteHooks{
client: rpc.NewClient(conn),
muxer: muxer,
}
implemented, err := remote.Implemented()
if err != nil {
remote.Close()
return nil, err
}
for _, method := range implemented {
switch method {
case "OnActivate":
remote.implemented[remoteOnActivate] = true
case "OnDeactivate":
remote.implemented[remoteOnDeactivate] = true
}
}
return remote, nil
}
|
