82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
package plugins
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"os"
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"path/filepath"
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"reflect"
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"github.com/http-wasm/http-wasm-host-go/handler"
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wasm "github.com/http-wasm/http-wasm-host-go/handler/nethttp"
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"github.com/tetratelabs/wazero"
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"github.com/traefik/traefik/v3/pkg/logs"
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"github.com/traefik/traefik/v3/pkg/middlewares"
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)
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type wasmMiddlewareBuilder struct {
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path string
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}
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func newWasmMiddlewareBuilder(goPath string, moduleName, wasmPath string) *wasmMiddlewareBuilder {
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return &wasmMiddlewareBuilder{path: filepath.Join(goPath, "src", moduleName, wasmPath)}
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}
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func (b wasmMiddlewareBuilder) newMiddleware(config map[string]interface{}, middlewareName string) (pluginMiddleware, error) {
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return &WasmMiddleware{
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middlewareName: middlewareName,
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config: reflect.ValueOf(config),
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builder: b,
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}, nil
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}
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func (b wasmMiddlewareBuilder) newHandler(ctx context.Context, next http.Handler, cfg reflect.Value, middlewareName string) (http.Handler, error) {
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code, err := os.ReadFile(b.path)
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if err != nil {
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return nil, fmt.Errorf("loading Wasm binary: %w", err)
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}
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logger := middlewares.GetLogger(ctx, middlewareName, "wasm")
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opts := []handler.Option{
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handler.ModuleConfig(wazero.NewModuleConfig().WithSysWalltime()),
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handler.Logger(logs.NewWasmLogger(logger)),
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}
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i := cfg.Interface()
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if i != nil {
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config, ok := i.(map[string]interface{})
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if !ok {
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return nil, fmt.Errorf("could not type assert config: %T", i)
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}
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data, err := json.Marshal(config)
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if err != nil {
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return nil, fmt.Errorf("marshaling config: %w", err)
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}
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opts = append(opts, handler.GuestConfig(data))
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}
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mw, err := wasm.NewMiddleware(context.Background(), code, opts...)
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if err != nil {
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return nil, err
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}
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return mw.NewHandler(ctx, next), nil
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}
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// WasmMiddleware is an HTTP handler plugin wrapper.
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type WasmMiddleware struct {
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middlewareName string
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config reflect.Value
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builder wasmMiddlewareBuilder
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}
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// NewHandler creates a new HTTP handler.
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func (m WasmMiddleware) NewHandler(ctx context.Context, next http.Handler) (http.Handler, error) {
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return m.builder.newHandler(ctx, next, m.config, m.middlewareName)
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}
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