| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 ( |
| "math" |
| "os" |
| "path/filepath" |
| "sync" |
| "sync/atomic" |
| ) |
| |
| import ( |
| "github.com/mitchellh/mapstructure" |
| "mosn.io/proxy-wasm-go-host/common" |
| "mosn.io/proxy-wasm-go-host/proxywasm" |
| "mosn.io/proxy-wasm-go-host/wasmer" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/context/http" |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/logger" |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/model" |
| ) |
| |
| // WasmService manages a collection of WasmInstances of the same type. |
| type WasmService struct { |
| rootContextID int32 |
| contextIDGenerator int32 |
| name string |
| path string |
| mutex sync.Mutex |
| model model.WasmService |
| instancePool sync.Pool |
| } |
| |
| // WasmConfig contains config about every wasmFile. |
| type WasmConfig struct { |
| Path string `yaml:"path" json:"path,omitempty"` |
| } |
| |
| // ABIContextWrapper is a request wrapper which indicates request was handled in the wasmInstance. |
| type ABIContextWrapper struct { |
| ContextID int32 |
| name string |
| Context *proxywasm.ABIContext |
| } |
| |
| func createWasmService(service model.WasmService) (*WasmService, error) { |
| var cfg WasmConfig |
| if err := mapstructure.Decode(service.Config, &cfg); err != nil { |
| return nil, err |
| } |
| |
| wasmService := &WasmService{ |
| contextIDGenerator: 0, |
| name: service.Name, |
| path: cfg.Path, |
| mutex: sync.Mutex{}, |
| model: service, |
| } |
| wasmService.rootContextID = atomic.AddInt32(&wasmService.contextIDGenerator, 1) |
| |
| wasmService.instancePool = sync.Pool{ |
| New: func() interface{} { |
| pwd, _ := os.Getwd() |
| path := filepath.Join(pwd, cfg.Path) |
| if _, err := os.Stat(path); err != nil { |
| logger.Warnf("[dubbo-go-pixiu] wasmFile path:%v error: %v", path, err) |
| return nil |
| } |
| instance := wasmer.NewWasmerInstanceFromFile(path) |
| proxywasm.RegisterImports(instance) |
| _ = instance.Start() |
| return instance |
| }, |
| } |
| return wasmService, nil |
| } |
| |
| func (ws *WasmService) getWasmInstance() common.WasmInstance { |
| return ws.instancePool.Get().(common.WasmInstance) |
| } |
| |
| func (ws *WasmService) putWasmInstance(instance common.WasmInstance) error { |
| ws.instancePool.Put(instance) |
| return nil |
| } |
| |
| func (ws *WasmService) createABIContextWrapper(ctx *http.HttpContext) *ABIContextWrapper { |
| |
| contextWrapper := new(ABIContextWrapper) |
| contextWrapper.ContextID = atomic.AddInt32(&ws.contextIDGenerator, 1) |
| atomic.CompareAndSwapInt32(&ws.contextIDGenerator, math.MaxInt32, 1) |
| |
| contextWrapper.name = ws.name |
| contextWrapper.Context = &proxywasm.ABIContext{ |
| Imports: &importHandler{ |
| ctx: ctx, |
| reqHeader: &headerWrapper{ |
| header: ctx.Request.Header, |
| }, |
| }, |
| Instance: ws.getWasmInstance(), |
| } |
| _ = contextWrapper.Context.GetExports().ProxyOnContextCreate(ws.rootContextID, 0) |
| |
| return contextWrapper |
| } |