| //go:build !windows |
| |
| /* |
| * 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 proxywasm |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/common/constant" |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/common/extension/filter" |
| "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/wasm" |
| ) |
| |
| func init() { |
| filter.RegisterHttpFilter(&Plugin{}) |
| } |
| |
| type ( |
| Plugin struct { |
| } |
| |
| WasmFilterFactory struct { |
| cfg *Config |
| } |
| |
| WasmFilter struct { |
| abiContextWrappers map[string]*wasm.ABIContextWrapper |
| } |
| |
| Config struct { |
| WasmServices []*Service `yaml:"wasm_services" json:"wasm_services" mapstructure:"wasm_services"` |
| } |
| |
| Service struct { |
| Name string `yaml:"name" json:"name" mapstructure:"name"` |
| } |
| ) |
| |
| func (w *WasmFilter) Decode(ctx *http.HttpContext) filter.FilterStatus { |
| |
| // sample: display http header |
| if wrapper := w.abiContextWrappers[wasm.HeaderLevel]; wrapper != nil { |
| wrapper.Context.Instance.Lock(wrapper.Context) |
| defer wrapper.Context.Instance.Unlock() |
| |
| err := wrapper.Context.GetExports().ProxyOnContextCreate(wrapper.ContextID, wasm.GetServiceRootID(wasm.HeaderLevel)) |
| if err != nil { |
| logger.Warnf("[dubbo-go-pixiu] wasmFilter call ProxyOnContextCreate failed: %v", err) |
| return filter.Continue |
| } |
| |
| _, err = wrapper.Context.GetExports().ProxyOnRequestHeaders(wrapper.ContextID, int32(len(ctx.Request.Header)), 1) |
| if err != nil { |
| logger.Warnf("[dubbo-go-pixiu] wasmFilter call ProxyOnRequestHeaders failed: %v", err) |
| } |
| |
| err = wrapper.Context.GetExports().ProxyOnDelete(wrapper.ContextID) |
| if err != nil { |
| logger.Warnf("[dubbo-go-pixiu] wasmFilter call ProxyOnDelete failed: %v", err) |
| } |
| } |
| return filter.Continue |
| } |
| |
| func (w *WasmFilter) Encode(ctx *http.HttpContext) filter.FilterStatus { |
| for _, wrapper := range w.abiContextWrappers { |
| if err := wasm.ContextDone(wrapper); err != nil { |
| logger.Warnf("[dubbo-go-pixiu] wasmFilter call contextDone failed: %v", err) |
| } |
| } |
| |
| if val := ctx.GetHeader("go-wasm-header"); val != "" { |
| if _, err := ctx.Writer.Write([]byte(val)); err != nil { |
| logger.Errorf("write response error: %s", err) |
| } |
| } |
| return filter.Continue |
| } |
| |
| func (factory *WasmFilterFactory) Config() interface{} { |
| return factory.cfg |
| } |
| |
| func (factory *WasmFilterFactory) Apply() error { |
| return nil |
| } |
| |
| func (factory *WasmFilterFactory) PrepareFilterChain(ctx *http.HttpContext, chain filter.FilterChain) error { |
| filter := &WasmFilter{ |
| abiContextWrappers: make(map[string]*wasm.ABIContextWrapper), |
| } |
| for _, service := range factory.cfg.WasmServices { |
| if abiContext := wasm.CreateABIContextByName(service.Name, ctx); abiContext != nil { |
| filter.abiContextWrappers[service.Name] = abiContext |
| } |
| } |
| chain.AppendDecodeFilters(filter) |
| chain.AppendEncodeFilters(filter) |
| return nil |
| } |
| |
| func (p *Plugin) Kind() string { |
| return constant.HTTPWasmFilter |
| } |
| |
| func (p *Plugin) CreateFilterFactory() (filter.HttpFilterFactory, error) { |
| return &WasmFilterFactory{ |
| cfg: &Config{}, |
| }, nil |
| } |