147 lines
3.8 KiB
Go
147 lines
3.8 KiB
Go
package plugins
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import (
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"context"
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"fmt"
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"net/http"
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"os"
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"path"
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"reflect"
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"strings"
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"github.com/mitchellh/mapstructure"
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"github.com/rs/zerolog"
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"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/logs"
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"github.com/traefik/yaegi/interp"
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"github.com/traefik/yaegi/stdlib"
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)
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type yaegiMiddlewareBuilder struct {
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fnNew reflect.Value
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fnCreateConfig reflect.Value
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}
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func newYaegiMiddlewareBuilder(i *interp.Interpreter, basePkg, imp string) (*yaegiMiddlewareBuilder, error) {
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if basePkg == "" {
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basePkg = strings.ReplaceAll(path.Base(imp), "-", "_")
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}
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fnNew, err := i.Eval(basePkg + `.New`)
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if err != nil {
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return nil, fmt.Errorf("failed to eval New: %w", err)
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}
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fnCreateConfig, err := i.Eval(basePkg + `.CreateConfig`)
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if err != nil {
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return nil, fmt.Errorf("failed to eval CreateConfig: %w", err)
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}
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return &yaegiMiddlewareBuilder{
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fnNew: fnNew,
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fnCreateConfig: fnCreateConfig,
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}, nil
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}
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func (b yaegiMiddlewareBuilder) newMiddleware(config map[string]interface{}, middlewareName string) (pluginMiddleware, error) {
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vConfig, err := b.createConfig(config)
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if err != nil {
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return nil, err
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}
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return &YaegiMiddleware{
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middlewareName: middlewareName,
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config: vConfig,
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builder: b,
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}, nil
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}
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func (b yaegiMiddlewareBuilder) newHandler(ctx context.Context, next http.Handler, cfg reflect.Value, middlewareName string) (http.Handler, error) {
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args := []reflect.Value{reflect.ValueOf(ctx), reflect.ValueOf(next), cfg, reflect.ValueOf(middlewareName)}
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results := b.fnNew.Call(args)
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if len(results) > 1 && results[1].Interface() != nil {
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err, ok := results[1].Interface().(error)
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if !ok {
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return nil, fmt.Errorf("invalid error type: %T", results[0].Interface())
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}
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return nil, err
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}
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handler, ok := results[0].Interface().(http.Handler)
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if !ok {
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return nil, fmt.Errorf("invalid handler type: %T", results[0].Interface())
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}
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return handler, nil
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}
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func (b yaegiMiddlewareBuilder) createConfig(config map[string]interface{}) (reflect.Value, error) {
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results := b.fnCreateConfig.Call(nil)
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if len(results) != 1 {
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return reflect.Value{}, fmt.Errorf("invalid number of return for the CreateConfig function: %d", len(results))
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}
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vConfig := results[0]
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if len(config) == 0 {
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return vConfig, nil
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}
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cfg := &mapstructure.DecoderConfig{
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DecodeHook: mapstructure.StringToSliceHookFunc(","),
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WeaklyTypedInput: true,
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Result: vConfig.Interface(),
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}
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decoder, err := mapstructure.NewDecoder(cfg)
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if err != nil {
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return reflect.Value{}, fmt.Errorf("failed to create configuration decoder: %w", err)
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}
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err = decoder.Decode(config)
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if err != nil {
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return reflect.Value{}, fmt.Errorf("failed to decode configuration: %w", err)
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}
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return vConfig, nil
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}
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// YaegiMiddleware is an HTTP handler plugin wrapper.
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type YaegiMiddleware struct {
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middlewareName string
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config reflect.Value
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builder yaegiMiddlewareBuilder
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}
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// NewHandler creates a new HTTP handler.
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func (m *YaegiMiddleware) 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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func newInterpreter(ctx context.Context, goPath string, manifestImport string) (*interp.Interpreter, error) {
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i := interp.New(interp.Options{
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GoPath: goPath,
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Env: os.Environ(),
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Stdout: logs.NoLevel(*log.Ctx(ctx), zerolog.DebugLevel),
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Stderr: logs.NoLevel(*log.Ctx(ctx), zerolog.ErrorLevel),
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})
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err := i.Use(stdlib.Symbols)
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if err != nil {
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return nil, fmt.Errorf("failed to load symbols: %w", err)
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}
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err = i.Use(ppSymbols())
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if err != nil {
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return nil, fmt.Errorf("failed to load provider symbols: %w", err)
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}
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_, err = i.Eval(fmt.Sprintf(`import "%s"`, manifestImport))
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if err != nil {
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return nil, fmt.Errorf("failed to import plugin code %q: %w", manifestImport, err)
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}
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return i, nil
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}
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