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dispatch.go
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dispatch.go
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// Copyright 2021 Layotto Authors
// 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 wasm
import (
"errors"
"math/rand"
"mosn.io/mosn/pkg/log"
)
type Group struct {
count int
plugins []*WasmPlugin
}
type Router struct {
routes map[string]*Group
}
// RegisterRoute register a group with id
// unsafe for concurrent
func (route *Router) RegisterRoute(id string, plugin *WasmPlugin) {
if group, found := route.routes[id]; found {
group.plugins = append(filter(group.plugins, func(item *WasmPlugin) bool {
return item.pluginName != plugin.pluginName
}).([]*WasmPlugin), plugin)
group.count = len(group.plugins)
} else {
route.routes[id] = &Group{
count: 1,
plugins: []*WasmPlugin{plugin},
}
}
}
func (route *Router) RemoveRoute(id string) {
delete(route.routes, id)
}
// Get random plugin with rand id
func (route *Router) GetRandomPluginByID(id string) (*WasmPlugin, error) {
group, ok := route.routes[id]
if !ok {
log.DefaultLogger.Infof("[proxywasm][dispatch] GetRandomPluginByID id not registered, id: %s", id)
return nil, errors.New("id is not registered")
}
idx := rand.Intn(group.count)
plugin := group.plugins[idx]
log.DefaultLogger.Infof("[proxywasm][dispatch] GetRandomPluginByID return index: %d, plugin: %s", idx, plugin.pluginName)
return plugin, nil
}