forked from lni/dragonboat
/
plugin.go
83 lines (75 loc) · 2.6 KB
/
plugin.go
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// Copyright 2017-2019 Lei Ni (nilei81@gmail.com)
//
// 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 client
import (
"fmt"
"plugin"
"github.com/lni/dragonboat/internal/utils/fileutil"
"github.com/lni/dragonboat/statemachine"
)
type pluginDetails struct {
filepath string
createNativeStateMachine func(uint64, uint64) statemachine.IStateMachine
}
func getPluginMap(path string) map[string]pluginDetails {
result := make(map[string]pluginDetails)
result = getNativePlugins(path, result)
result = getCppPlugins(path, result)
return result
}
func getNativePlugins(path string,
result map[string]pluginDetails) map[string]pluginDetails {
for _, cp := range fileutil.GetPossibleSOFiles(path) {
p, err := plugin.Open(cp)
if err != nil {
plog.Panicf("failed to open so file %s, %s", cp, err.Error())
}
nf, err := p.Lookup("DragonboatApplicationName")
if err != nil {
plog.Panicf("no DragonboatApplicationName in plugin %s", cp)
}
appName := *nf.(*string)
csm, err := p.Lookup("CreateStateMachine")
if err != nil {
plog.Panicf("no CreateStateMachine func in %s", cp)
}
cf := csm.(func(uint64, uint64) statemachine.IStateMachine)
if _, ok := result[appName]; ok {
plog.Panicf("plugins with the same appName %s already exist", appName)
} else {
result[appName] = pluginDetails{createNativeStateMachine: cf}
plog.Infof("added a create sm function from %s, appName: %s",
cp, appName)
}
}
return result
}
func getCppPlugins(path string,
result map[string]pluginDetails) map[string]pluginDetails {
for _, cp := range fileutil.GetPossibleCPPSOFiles(path) {
// FIXME:
// re-enable the following check
// check whether using cgo in multiraft package is going trigger
// the known bug that is affecting the go plugin.
//if !isValidCPPPlugin(cp) {
// panic(fmt.Sprintf("invalid cpp plugin at %s", cp))
//}
appName := fileutil.GetAppNameFromFilename(cp)
entryName := fmt.Sprintf("cpp-%s", appName)
plog.Infof("adding a C++ plugin %s, entryName: %s, appName: %s",
cp, entryName, appName)
result[entryName] = pluginDetails{filepath: cp}
}
return result
}