ginuerzh
3b25e0317f
Add the first implementation of core/rewriter.Rewriter as a plugin-only component following the bypass/admission pattern (single-value, no RewriterObject). Includes: - plugin/rewriter/proto/: protobuf definition with Rewrite RPC returning transformed data in the reply - x/rewriter/plugin/: gRPC and HTTP plugin clients - x/registry/rewriter.go: hot-reload-safe RewriterRegistry with wrapper - x/config/config.go: RewriterConfig, Config.Rewriters, ServiceConfig.Rewriter - x/config/parsing/rewriter/parse.go: config parser (plugin backends only) - core/handler/option.go: Rewriter field + RewriterOption on handler.Options - x/config/loader/loader.go: rewriter registration during startup - x/config/parsing/service/parse.go: inject rewriter into handler options
105 lines
1.9 KiB
Go
105 lines
1.9 KiB
Go
package rewriter
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import (
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"bytes"
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"context"
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"encoding/json"
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"net/http"
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"github.com/go-gost/core/logger"
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"github.com/go-gost/core/rewriter"
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"github.com/go-gost/x/internal/plugin"
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)
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type httpPluginRequest struct {
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Data []byte `json:"data"`
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Metadata []byte `json:"metadata"`
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}
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type httpPluginResponse struct {
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OK bool `json:"ok"`
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Data []byte `json:"data"`
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}
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type httpPlugin struct {
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url string
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client *http.Client
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header http.Header
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log logger.Logger
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}
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// NewHTTPPlugin creates a Rewriter plugin based on HTTP.
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func NewHTTPPlugin(name string, url string, opts ...plugin.Option) rewriter.Rewriter {
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var options plugin.Options
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for _, opt := range opts {
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opt(&options)
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}
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return &httpPlugin{
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url: url,
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client: plugin.NewHTTPClient(&options),
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header: options.Header,
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log: logger.Default().WithFields(map[string]any{
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"kind": "rewriter",
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"rewriter": name,
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}),
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}
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}
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func (p *httpPlugin) Rewrite(ctx context.Context, b []byte, opts ...rewriter.RewriteOption) ([]byte, error) {
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if p.client == nil {
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return b, nil
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}
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var options rewriter.RewriteOptions
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for _, opt := range opts {
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opt(&options)
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}
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md, err := json.Marshal(options.Metadata)
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if err != nil {
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return b, err
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}
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rb := httpPluginRequest{
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Data: b,
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Metadata: md,
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}
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v, err := json.Marshal(&rb)
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if err != nil {
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return b, err
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, p.url, bytes.NewReader(v))
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if err != nil {
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return b, err
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}
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if p.header != nil {
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req.Header = p.header.Clone()
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}
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req.Header.Set("Content-Type", "application/json")
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resp, err := p.client.Do(req)
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if err != nil {
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return b, err
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return b, nil
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}
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res := httpPluginResponse{}
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if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
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return b, err
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}
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if !res.OK {
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return b, nil
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}
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if res.Data != nil {
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return res.Data, nil
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}
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return b, nil
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}
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